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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: 9w.ZXd  
  _g%,/y 9y  
  一、实现方法 dmPAPCm%y  
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  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: JYrOE "!h  
O"9Or3w  
#pragma data_seg("shareddata") ` M!'PMX  
HHOOK hHook =NULL; //钩子句柄 "L+NN|  
UINT nHookCount =0; //挂接的程序数目 J[al4e^  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #L+ZHs~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 "{x+ \Z\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @*=eqO  
static int KeyCount =0; (05a 9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 gB])@O%/  
#pragma data_seg() qo7jrY5G  
.TO#\!KBv  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 yX%NFXD  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: l0lvca=;  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ~(}n d  
cKey,UCHAR cMask) G]T&{3g-.  
{ l*b0uF  
 BOOL bAdded=FALSE; @me ( pnD  
 for(int index=0;index<MAX_KEY;index++){ B8>3GZi  
  if(hCallWnd[index]==0){ jE!?;} P1  
   hCallWnd[index]=hWnd; {w mP  
   HotKey[index]=cKey; r#B{j$Rw   
   HotKeyMask[index]=cMask; juEH$7N !  
   bAdded=TRUE; C}]143a/Q  
   KeyCount++; IgEVz^W?h  
   break; 8=-#LVo~c  
  } " nLWvV1  
 } SI/3Dz[  
 return bAdded; AA5UOg\jI  
} B pp(5  
//删除热键 WDF6.i ?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]F sr k  
{ Q*8efzgs|  
 BOOL bRemoved=FALSE; HXgf=R/$  
 for(int index=0;index<MAX_KEY;index++){ z6Zd/mt~x  
  if(hCallWnd[index]==hWnd){ P\&n0C~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >:|jds#  
    hCallWnd[index]=NULL; 7~H"m/;U&  
    HotKey[index]=0; a0PClbf2.  
    HotKeyMask[index]=0; 8gW$\  
    bRemoved=TRUE; JfzfxfM  
    KeyCount--; zcOG[-  
    break; q OV$4[r  
   } VLC=>w\,  
  } 22R ,  
 } >'v{o{k|C  
 return bRemoved; "@L|Z6U(  
} T1c& 3  
GRAPv|u9[  
-# /'^O +%  
  DLL中的钩子函数如下: : 2A\X' @  
~vKDB$2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /;WFRp.  
{ $?y\3GX  
 BOOL bProcessed=FALSE; uo3o[ H&#  
 if(HC_ACTION==nCode) gH/(4h  
 { <*z9:jz Q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 e7n` fEpO  
   switch(wParam) bdj')%@n  
   {  * & : J  
    case VK_MENU: W.> }5uVl6  
     MaskBits&=~ALTBIT; Vo9Fl Yj  
     break; h%&2M58:  
    case VK_CONTROL: oiItQ4{<  
     MaskBits&=~CTRLBIT; PDb7h  
     break; 8xx2+  
    case VK_SHIFT: p{;FO?  
     MaskBits&=~SHIFTBIT; ?|{tWR,Vb  
     break; T1uOp5_]B  
    default: //judge the key and send message LT:8/&\  
     break; })C}'!+]  
   } =~'y'K]  
   for(int index=0;index<MAX_KEY;index++){ }8Nr .gY  
    if(hCallWnd[index]==NULL) @+Anp4%;Y  
     continue; @!B% ynrG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h%]  D[g  
    { BrsBB"<o,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); oT9qd@uQ0:  
     bProcessed=TRUE; \xX'SB#.l  
    } K}tC8D  
   } HJ!P]X_J1  
  } y|(?>\jBl  
  else if((lParam&0xc000ffff)==1){ //有键按下 4K$_d,4`U  
   switch(wParam) >+Y@rj2  
   { CPJ%<+4%b  
    case VK_MENU: \1oN't.  
     MaskBits|=ALTBIT; 90">l^HX=  
     break; V BjA$.  
    case VK_CONTROL:  m5lTf  
     MaskBits|=CTRLBIT; ]f*.C9Y  
     break; q }hHoSG]=  
    case VK_SHIFT: ADB,gap  
     MaskBits|=SHIFTBIT; v|:TYpku3  
     break; nw=:+?  
    default: //judge the key and send message ZX0!BS  
     break; du&9mOrr  
   } M! uE#|  
   for(int index=0;index<MAX_KEY;index++){ lGX8kAv?  
    if(hCallWnd[index]==NULL) K*N8Vpz(  
     continue; [q~3$mjQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _aw49ag;  
    { oI x!?,1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  5 c1{[  
     bProcessed=TRUE; \8]("l}ms8  
    } trlZ  
   } Cg]S`R-  
  } vO8CT-)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ]Mj N)%hT  
   for(int index=0;index<MAX_KEY;index++){ @O HsM?nW  
    if(hCallWnd[index]==NULL) x n}HB  
     continue; |qtZb}"|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9O-*iK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8\m[Nuq5  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 kjj?X|Un  
   } qKNHhXi  
  } I1W~;2cK  
 } E*8 3N@i  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #fxdZm,  
} S{zl <>+  
`,Y/!(:;  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: /\5u-o)  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LR y&/d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .gA4gI1kH  
?]0bR]}y  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Env_??xq  
XO}v8nWV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j_}f6d/h  
{ "\"sM{x  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0-8'. C1v  
 { Yn8aTg[J  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;%4N@Z  
  SaveBmp(); "PC9[i  
  return FALSE; y-o54e$4Cq  
 } "^5%g%  
 …… //其它处理及默认处理 n4 J*04K  
} n hGh5,  
?$%2\"wX~7  
lVS.XQ2<  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 H`NT`BE  
Mgg m~|9)  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 =xM:8 hm  
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  二、编程步骤 AHn Yfxv_  
2E0$R%\  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; AI2@VvB  
$J]o\~Z J  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 7aeyddpM  
=yLJGNK[  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; nmUMg  
9oxn-)6JC  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; cGS7s 8U  
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  5、 添加代码,编译运行程序。 U )J/so)  
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三、程序代码 a<v!5\dq!  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL 3zo:)N \K  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 5U<;6s  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wU/BRz8I  
#if _MSC_VER > 1000 td(4Fw||1y  
#pragma once >d$Sh`a6  
#endif // _MSC_VER > 1000 Y]H,rO  
#ifndef __AFXWIN_H__ vXeI)vFK  
#error include 'stdafx.h' before including this file for PCH 0 LIRi%N5*  
#endif Un\ T} c  
#include "resource.h" // main symbols aYcc2N%C  
class CHookApp : public CWinApp 6}GcMhU<r  
{ ;BYv&(#u1q  
 public: &HJ'//bv  
  CHookApp(); O@sJ#i>  
  // Overrides c_FnJ_++f  
  // ClassWizard generated virtual function overrides -)p| i~j^A  
  //{{AFX_VIRTUAL(CHookApp) >m8~Fs0  
 public: jT1^oXn@  
  virtual BOOL InitInstance(); v_NL2eQ~  
  virtual int ExitInstance(); Fle pM*  
  //}}AFX_VIRTUAL vlh$NK+F  
  //{{AFX_MSG(CHookApp) Kp%:\s,lO  
  // NOTE - the ClassWizard will add and remove member functions here. C}(9SASs%  
  // DO NOT EDIT what you see in these blocks of generated code ! 's 'H&sa  
  //}}AFX_MSG TtP2>eh-  
  DECLARE_MESSAGE_MAP() _A,mY6 *  
}; yf2$HF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ($[)Tcq*~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l$3YJ.n|s~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #qg(DgH 7  
BOOL InitHotkey(); .|<+-Rsj  
BOOL UnInit(); b]Z>P{ j  
#endif 6'qu[ ~ }Q  
tzdh3\6F  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. y(*#0fJrTV  
#include "stdafx.h" w}r~Wk^dLI  
#include "hook.h" zM!2JC  
#include <windowsx.h> )m.U"giG++  
#ifdef _DEBUG Wd]MwDcO  
#define new DEBUG_NEW A7=k 9|  
#undef THIS_FILE Jj,fdP#\  
static char THIS_FILE[] = __FILE__; #Iwxt3K  
#endif iBaz1pDc  
#define MAX_KEY 100 xBg. QV  
#define CTRLBIT 0x04 HAc1w]{(  
#define ALTBIT 0x02 [WW ~SOJe  
#define SHIFTBIT 0x01 w^8i!jCy  
#pragma data_seg("shareddata") B):hm  
HHOOK hHook =NULL; DBk]2W|i  
UINT nHookCount =0; j/uu&\e  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !nt[J$.z^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 5Za%EaW%G  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey H?tX^HO:q  
static int KeyCount =0; [LDY;k~5+  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift wi@Qf6(mn  
#pragma data_seg() se&Q\!&M  
HINSTANCE hins; O7lFg;9c`  
void VerifyWindow(); -8m3L  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) T1WH  
//{{AFX_MSG_MAP(CHookApp) +S ],){  
// NOTE - the ClassWizard will add and remove mapping macros here. ,WQg.neOA  
// DO NOT EDIT what you see in these blocks of generated code! W?X3 :1c9:  
//}}AFX_MSG_MAP eH^~r{{R  
END_MESSAGE_MAP() vk.P| Y-;  
QZv}\C-c  
CHookApp::CHookApp() #VynADPs`o  
{ Lf+"Gp  
 // TODO: add construction code here, *:V+whBY  
 // Place all significant initialization in InitInstance Z,7VOf6g  
} 12HE =  
<P.'r,"[  
CHookApp theApp; U *:E|'>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]'5 G/H5?;  
{ 'ZAl7k .  
 BOOL bProcessed=FALSE; ,v_NrX=f?  
 if(HC_ACTION==nCode) )>I-j$%=2  
 { W.Z`kH *B  
  if((lParam&0xc0000000)==0xc0000000){// Key up U6F1QLSLz  
   switch(wParam) Cxra(!&  
   { "?ON0u9  
    case VK_MENU: 5%RiM|+  
     MaskBits&=~ALTBIT; z4{ :X Da  
     break; yoG*c%3V?  
    case VK_CONTROL:  4}F~h  
     MaskBits&=~CTRLBIT; yZkS   
     break; {3!E8~  
    case VK_SHIFT: t[o_!fmxZ  
     MaskBits&=~SHIFTBIT; a6!|#rt  
     break; ,)ZI&BL5  
    default: //judge the key and send message r1/9BTPKdJ  
     break; JsHD3  
   } hO; XJyv  
   for(int index=0;index<MAX_KEY;index++){ &gsBbQ+qA  
    if(hCallWnd[index]==NULL) p> g[: ~  
     continue; vW4n>h}]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AL;4-(KH  
    { %uDH_J|^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "NtY[sT{V  
     bProcessed=TRUE; R*DQLBWc  
    } 7> 8L%(7  
   } 58P[EMhL  
  } il% u)NN  
  else if((lParam&0xc000ffff)==1){ //Key down |H.ARLS  
   switch(wParam) d r$E:kr  
   { o>\o=%D.a  
    case VK_MENU: pD;fFLvN  
     MaskBits|=ALTBIT; :f~qt%%/  
     break; }/2M?W0  
    case VK_CONTROL: (9Q@I8}Iy  
     MaskBits|=CTRLBIT; %"^8$A?>,k  
     break; e%C_>  
    case VK_SHIFT: {A'_5 X9  
     MaskBits|=SHIFTBIT; iTVZo?lVo  
     break; T{)_vQ  
    default: //judge the key and send message v?_L_{x;W  
     break; (D0\uld9  
   } tE,& G-jU  
   for(int index=0;index<MAX_KEY;index++) EYA=fU  
   { Q2[; H!"  
    if(hCallWnd[index]==NULL) yt<h!k$ _P  
     continue; "$pbK:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ea]qX6)UZ  
    { %z=:P{0UQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ka6E s~  
     bProcessed=TRUE; %-a;HGbZn  
    } `mA;1S  
   } 2vh }:A_  
  } r)#W`A1{A  
  if(!bProcessed){ @<`V q  
   for(int index=0;index<MAX_KEY;index++){ Lq;T\m_de  
    if(hCallWnd[index]==NULL) )[oP `Z  
     continue; -+Ot' ^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) tDRo)z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); d%.|MAE  
   } E- [Eg  
  } V:>r6  
 } 0N~kq-6.\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?|98Y"w  
} (~o"*1fk>  
;0Q" [[J  
BOOL InitHotkey() r-go921  
{ l i)6^f#  
 if(hHook!=NULL){ L""ZI5J{F9  
  nHookCount++; J]#rh5um  
  return TRUE; Z,O* p,Gzn  
 } FzcXSKHV %  
 else 0|.jIix;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); I;-Y2*  
  if(hHook!=NULL) oyr b.lu/  
   nHookCount++; Q4_r) &np  
  return (hHook!=NULL); o$eCd{HuX  
} ;mT}Q;F#  
BOOL UnInit() : NA(nA 3  
{ 3UaW+@  
 if(nHookCount>1){ ^ghYi|kQq  
  nHookCount--; n~]"sTC}&  
  return TRUE; &bz% @p;  
 } Km $o@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); g(W+[kj)  
 if(unhooked==TRUE){ tjt^R$[@  
  nHookCount=0; Zp^O1&\SK?  
  hHook=NULL; v/9DD%An  
 } +<.o,3  
 return unhooked; ]WYV  
} 3]GMQA{L)  
FR[I~unqD  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vi *A 5  
{ <g%A2 lI  
 BOOL bAdded=FALSE; Ln2FG4{  
 for(int index=0;index<MAX_KEY;index++){ .|^Gde  
  if(hCallWnd[index]==0){ ,dR.Sac v  
   hCallWnd[index]=hWnd; z=) m6\  
   HotKey[index]=cKey; 9I]Bt=2z  
   HotKeyMask[index]=cMask; C\;l)h_{  
   bAdded=TRUE; "+T`{$Z=C  
   KeyCount++; '?| 1\j  
   break; +Wg/ O -  
  } Jw8?o/1D@  
 } YI ?P@y  
 return bAdded; :;.^r,QAI  
} D\b$$z]q  
51b%uz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Y|><Ls6Q  
{ *U,J Q  
 BOOL bRemoved=FALSE; NS2vA>n8R  
 for(int index=0;index<MAX_KEY;index++){ xYCJO(&  
  if(hCallWnd[index]==hWnd){ h?p_jI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ E& i (T2c  
    hCallWnd[index]=NULL; E I(e3  
    HotKey[index]=0; n"T ^  
    HotKeyMask[index]=0; tp}/>gU!  
    bRemoved=TRUE; cI'n[G  
    KeyCount--; xi(1H1KN5B  
    break; 'fl< ac,.  
   } 9D+k71"+  
  } $] "M`h  
 }  ?bVIH?  
 return bRemoved; 4pf@.ra,  
} ,AweHUEn  
d}zh.O5P!  
void VerifyWindow() ^n0;Q$\  
{ <O 0Q]`i  
 for(int i=0;i<MAX_KEY;i++){ G(.G>8pf  
  if(hCallWnd!=NULL){ Ba8=nGa4KY  
   if(!IsWindow(hCallWnd)){  Q&xH  
    hCallWnd=NULL; c>K]$;}  
    HotKey=0; OQ hQ!6  
    HotKeyMask=0; T2S_> #."l  
    KeyCount--; PXYLL X\3  
   } sWte&  
  } Z::I3 Q  
 } S xJ&5q  
} G~8BND[."  
)g dLb}  
BOOL CHookApp::InitInstance() zUL,~u  
{ QF/_?Tm4  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zP%s]>hH  
 hins=AfxGetInstanceHandle(); gAWi&  
 InitHotkey(); XJ\R'?j  
 return CWinApp::InitInstance(); DOJydYds  
} =yZq]g6Q  
Zh;wQCDj  
int CHookApp::ExitInstance() }W8A1-UF  
{ B6 (\1  
 VerifyWindow(); #4O4,F>e  
 UnInit(); "H[K3  
 return CWinApp::ExitInstance(); Sp5:R75vI  
} dT*Yv`h  
H5x7)1Ir|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Kh\ 7%>K#  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) UgGa]b[9A  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ f(w>(1&/B  
#if _MSC_VER > 1000 rZ `1G  
#pragma once ih".y3  
#endif // _MSC_VER > 1000 ^#<L!yo^  
{\D &*  
class CCaptureDlg : public CDialog KJ'ID  
{ qx5`lm~L  
 // Construction i`2SebDj'w  
 public: * ) <+u~  
  BOOL bTray; 8F8?1  
  BOOL bRegistered; o'$"MC+  
  BOOL RegisterHotkey(); ]6^<VC`5D  
  UCHAR cKey; {IJ;)<>&VE  
  UCHAR cMask; "u7[[.P)  
  void DeleteIcon(); GLtd<M"  
  void AddIcon(); H_ $?b  
  UINT nCount; n8<?<-2  
  void SaveBmp(); =WT$\KYGv  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor XYzaSp=bb  
  // Dialog Data T<pG$4_  
  //{{AFX_DATA(CCaptureDlg) w-pgtO|Us  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ah wi  
  CComboBox m_Key; RH;ulAD6(~  
  BOOL m_bControl; \s&Mz;:  
  BOOL m_bAlt; '-%1ILK$3r  
  BOOL m_bShift; .@,t}:lD  
  CString m_Path; d#0:U Y%~  
  CString m_Number; z9ADF(J?0'  
  //}}AFX_DATA ]@Zv94Z(  
  // ClassWizard generated virtual function overrides 6i[Ts0H%<!  
  //{{AFX_VIRTUAL(CCaptureDlg) >NBc-DX^  
 public: 'Nl hLu  
  virtual BOOL PreTranslateMessage(MSG* pMsg); nU>P%|loXx  
 protected: -j3Lgm  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support CK7([>2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); xUdGSr50  
  //}}AFX_VIRTUAL wli cuY?  
  // Implementation JLE&nbKS  
 protected: =Nt HV4=b  
  HICON m_hIcon; hi[nUG(OI  
  // Generated message map functions '|SO7}`;Q  
  //{{AFX_MSG(CCaptureDlg) :Ph>\aG  
  virtual BOOL OnInitDialog(); "V>}-G&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %i9 e<.Ot  
  afx_msg void OnPaint(); |MZ1j(_  
  afx_msg HCURSOR OnQueryDragIcon(); mF;mJq<d  
  virtual void OnCancel(); h+1|.d  
  afx_msg void OnAbout(); skcyLIb  
  afx_msg void OnBrowse(); `MSig)V  
  afx_msg void OnChange(); cuQ!"iH  
 //}}AFX_MSG &!CVF  
 DECLARE_MESSAGE_MAP() 754MQK|g  
}; /9R0}4i7  
#endif M(I%y0  
X vaIOt>A  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }i~k:kmV  
#include "stdafx.h" " !EnQB=  
#include "Capture.h" M_ukG~/  
#include "CaptureDlg.h" o0R?vnA=  
#include <windowsx.h> ur}'Y^0iR  
#pragma comment(lib,"hook.lib")  B(;MI`  
#ifdef _DEBUG ?@G s7'  
#define new DEBUG_NEW ,>-D xS  
#undef THIS_FILE blgA`)GI  
static char THIS_FILE[] = __FILE__; 27D*FItc  
#endif g3$'G hf  
#define IDM_SHELL WM_USER+1 !{jw!bB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Rs<q^w]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Qfn:5B]tI  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #<*.{"T  
class CAboutDlg : public CDialog s?EQ  
{ -O *_+8f  
 public: epiviCYC  
  CAboutDlg(); B"&-) (  
  // Dialog Data :8)Jnh\5  
  //{{AFX_DATA(CAboutDlg) 'v]0;~\mp>  
  enum { IDD = IDD_ABOUTBOX }; $NVVurXa  
  //}}AFX_DATA YcobK#c  
  // ClassWizard generated virtual function overrides t<8)h8eW  
  //{{AFX_VIRTUAL(CAboutDlg) MIZdk'.U  
 protected: G]ek-[-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RK!9(^Ja  
  //}}AFX_VIRTUAL 0V~zZ/e  
  // Implementation 64?HqO 6(  
 protected: S.!,qv z  
  //{{AFX_MSG(CAboutDlg) .2E/(VM  
  //}}AFX_MSG 0zH-g  
  DECLARE_MESSAGE_MAP() R2Tt6  
}; ^!\1q<@n  
#"UO`2~`l  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) wG,"X'1  
{ MR1I"gqE}I  
 //{{AFX_DATA_INIT(CAboutDlg) h< r(:.%!}  
 //}}AFX_DATA_INIT A'jvm@DvQI  
} `"=>lu2H   
I<D#   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) K ";Et  
{ ;g!rc#z2g  
 CDialog::DoDataExchange(pDX); "A}sD7xy9  
 //{{AFX_DATA_MAP(CAboutDlg) 6'^E ],:b  
 //}}AFX_DATA_MAP ;TJpD0  
} n*7^lAa2  
+c~&o83[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ]:gW+6w"C  
 //{{AFX_MSG_MAP(CAboutDlg) Ok_}d&A  
 // No message handlers w#b@6d  
 //}}AFX_MSG_MAP hBX*02p   
END_MESSAGE_MAP() OE@[a  
Q7aPW\-  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Jo { :]:  
: CDialog(CCaptureDlg::IDD, pParent) r'*$'QY-N  
{ w7@`:W  
 //{{AFX_DATA_INIT(CCaptureDlg) i3w~&y-  
  m_bControl = FALSE; 9A"s7iJ)  
  m_bAlt = FALSE; T<B}Z11R  
  m_bShift = FALSE; 4QA~@pBX^{  
  m_Path = _T("c:\\"); n2K1X!E$  
  m_Number = _T("0 picture captured."); d=vuy   
  nCount=0; G<7M;vRvP  
  bRegistered=FALSE; 2f[;U"  
  bTray=FALSE; WLl8oE< X  
 //}}AFX_DATA_INIT R/oi6EKv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 j0e,>X8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); kkjugm{D7  
} 2=_$&oT**  
EHC7b^|3}  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6B?jc/V.R  
{ N9!L8BBaK  
 CDialog::DoDataExchange(pDX); g=t`3X#d  
 //{{AFX_DATA_MAP(CCaptureDlg) v'i'I/  
  DDX_Control(pDX, IDC_KEY, m_Key); )h}IZSm  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *S}@DoXS  
  DDX_Check(pDX, IDC_ALT, m_bAlt); $Lp [i <O]  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); WutPy_L<  
  DDX_Text(pDX, IDC_PATH, m_Path); 6nL^"3@S!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9rMO=  
 //}}AFX_DATA_MAP ^VXhv9\>B  
} +*8su5:[&@  
EX8+3>)  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ii?T:T@  
//{{AFX_MSG_MAP(CCaptureDlg) @5^&&4>N  
 ON_WM_SYSCOMMAND() ^)-[g  
 ON_WM_PAINT() T`E0_ZU;  
 ON_WM_QUERYDRAGICON() ,m{R m0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) i% 1UUI(W  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {32m&a  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7+P;s,mi7  
//}}AFX_MSG_MAP Wq4<9D  
END_MESSAGE_MAP() ?y? 9;;  
I!L J&>  
BOOL CCaptureDlg::OnInitDialog() ["D!IqI :  
{ D&):2F^9.  
 CDialog::OnInitDialog(); ?h[HC"V/2  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); {'M<dI$  
 ASSERT(IDM_ABOUTBOX < 0xF000); )95k3xo  
 CMenu* pSysMenu = GetSystemMenu(FALSE); q\@Zf}  
 if (pSysMenu != NULL) ]VjvG};  
 { `E$vWZq}  
  CString strAboutMenu; \E?3nQM  
  strAboutMenu.LoadString(IDS_ABOUTBOX); nB`|VYmOP1  
  if (!strAboutMenu.IsEmpty()) %&6Q Uv^  
  { D|ceZ <9x  
   pSysMenu->AppendMenu(MF_SEPARATOR); Eiu/p&ct  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2K9X (th1  
  } !'N@ZZ  
 } m54>}  
 SetIcon(m_hIcon, TRUE); // Set big icon %>&ex0j]  
 SetIcon(m_hIcon, FALSE); // Set small icon D"pT?\kO  
 m_Key.SetCurSel(0); z6R|1L 1  
 RegisterHotkey(); p-i Fe\+  
 CMenu* pMenu=GetSystemMenu(FALSE); _{jC?rzb  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Z^>4qf,k  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); D3 C7f'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); fQ5v?(  
 return TRUE; // return TRUE unless you set the focus to a control rn|]-^ku/  
} ?>B?*IK!  
t"4* ]S  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) p3Ux%/ZqPV  
{ 1b3 a(^^E  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) DKj iooD  
 { .Exvuo`F  
  CAboutDlg dlgAbout; f]i"tqoI  
  dlgAbout.DoModal(); =6~  
 } ?"Ez  
 else ;<M}ZL@m  
 { Ikdj?"+O  
  CDialog::OnSysCommand(nID, lParam); Z+v,o1  
 } `^[k8Z(  
} A;L ]=J  
N~,Ipf  
void CCaptureDlg::OnPaint() P\MDD@  
{ Q` &#u#  
 if (IsIconic()) "kP,v&n  
 { a>OYJe  
  CPaintDC dc(this); // device context for painting d}Pfj=W  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )Jjp^U3Ub  
  // Center icon in client rectangle ?SNacN@r  
  int cxIcon = GetSystemMetrics(SM_CXICON); 8H4NNj Oy  
  int cyIcon = GetSystemMetrics(SM_CYICON); *V kaFQZ$,  
  CRect rect; M*0^<e~]F  
  GetClientRect(&rect); q? ">  
  int x = (rect.Width() - cxIcon + 1) / 2; bh@CtnO  
  int y = (rect.Height() - cyIcon + 1) / 2; 9I/l+IS"X  
  // Draw the icon PRU&y/zZmG  
  dc.DrawIcon(x, y, m_hIcon); -W9DH^EL<  
 } Nud =K'P=  
 else 1\fx57a\  
 { )YAa7\Od  
  CDialog::OnPaint(); Q/SO%E`E  
 } )Dz]Pv]H'  
} ym|7i9  
L ?/AKg  
HCURSOR CCaptureDlg::OnQueryDragIcon() S=,czs3N  
{ l6bY!I>  
 return (HCURSOR) m_hIcon; EsKgS\`RZ  
} hV(^Y)f  
Z;G*wM"  
void CCaptureDlg::OnCancel() F- -g?Q^  
{  $U?]^  
 if(bTray) 59zWB,y(P  
  DeleteIcon(); `o{ Z;-OF  
  CDialog::OnCancel(); -| FHv+  
} ~-k , $J?7  
#//xOL3J  
void CCaptureDlg::OnAbout() &9flNoNR9  
{ R5ra*!|L)  
 CAboutDlg dlg; z0rYzn?MR  
 dlg.DoModal(); b,+Sa\j)(  
} ]jD\4\M}  
/O:4u_  
void CCaptureDlg::OnBrowse() @ ;!IPiU  
{ HX2u{2$  
 CString str; *F%1~  
 BROWSEINFO bi;  ?^Aj\z>  
 char name[MAX_PATH]; :2KHiT5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); =H)]HxEEM  
 bi.hwndOwner=GetSafeHwnd(); d'96$e o~  
 bi.pszDisplayName=name; /''=V.-N  
 bi.lpszTitle="Select folder"; f!kZyD7  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )l`Ks  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); +A?P4}  
 if(idl==NULL) Bug.>ln1  
  return; G{[w+ObX  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); k( Sda>-  
 str.ReleaseBuffer(); e#/&A5#Ya  
 m_Path=str; QwX81*nx  
 if(str.GetAt(str.GetLength()-1)!='\\') Zy+ERaF|]  
  m_Path+="\\"; EK4%4<"  
 UpdateData(FALSE); {3  
} o6A$)m5V  
HVus\s\&y%  
void CCaptureDlg::SaveBmp() MU$tX  
{  `vH|P  
 CDC dc; Kn->R9Tl  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zd5=W"Y;]  
 CBitmap bm; _fS\p|W(E  
 int Width=GetSystemMetrics(SM_CXSCREEN); h |]cZMGo  
 int Height=GetSystemMetrics(SM_CYSCREEN); ei4LE XQ16  
 bm.CreateCompatibleBitmap(&dc,Width,Height); XnP?hw%  
 CDC tdc; >s5}pkAv|e  
 tdc.CreateCompatibleDC(&dc); RK.lz VaY  
 CBitmap*pOld=tdc.SelectObject(&bm); ta{24{?M\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^>E>\uz0v  
 tdc.SelectObject(pOld); DyqqY$ vH(  
 BITMAP btm; )f$4: Pq  
 bm.GetBitmap(&btm); RVA ku  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *{VC<<`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); @ovaOX  
 BITMAPINFOHEADER bih; b4L7]&  
 bih.biBitCount=btm.bmBitsPixel; iYBc4'X  
 bih.biClrImportant=0; QD0x^v8  
 bih.biClrUsed=0; {v0r'+`  
 bih.biCompression=0; /%;J1 {O  
 bih.biHeight=btm.bmHeight; =!L}/Dl  
 bih.biPlanes=1; BR|0uJ.M  
 bih.biSize=sizeof(BITMAPINFOHEADER); J.JD8o9sa  
 bih.biSizeImage=size; zV}:~;w  
 bih.biWidth=btm.bmWidth; iT&4;W=72~  
 bih.biXPelsPerMeter=0; xY]q[a?cy  
 bih.biYPelsPerMeter=0; iA{q$>{8  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 'GezIIaH  
 static int filecount=0; atpHv**D<i  
 CString name; )w4U]inJ$"  
 name.Format("pict%04d.bmp",filecount++); kk`K;`[tB  
 name=m_Path+name; zwC ,,U  
 BITMAPFILEHEADER bfh; lZRO"[<  
 bfh.bfReserved1=bfh.bfReserved2=0; K/B$1+O  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2'=)ese  
 bfh.bfSize=54+size; `^/8dIya  
 bfh.bfOffBits=54; .'o=J`|  
 CFile bf; DNZ,rL:h  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ b4wT3  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 445JOP  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); h._eP.W`  
  bf.WriteHuge(lpData,size); uxn+.fA  
  bf.Close(); A5F (-  
  nCount++; GXm#\)  
 } ??aO3Vm{  
 GlobalFreePtr(lpData); "7EK{6&jQ  
 if(nCount==1) 9b >+ehjB  
  m_Number.Format("%d picture captured.",nCount); 4z P"h0  
 else mf g>69,w  
  m_Number.Format("%d pictures captured.",nCount); Fc[vs52  
  UpdateData(FALSE); mCt/\  
} q}p$S2`  
_O}U4aGMTC  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) w_>\Yd[  
{ r'nPP6`  
 if(pMsg -> message == WM_KEYDOWN) pf'DbY!  
 { <gi~:%T  
  if(pMsg -> wParam == VK_ESCAPE) :Ni#XZ{F-/  
   return TRUE; cQ<|Of  
  if(pMsg -> wParam == VK_RETURN) 9 Vq   
   return TRUE; ;UXV!8SM  
 } h8O\sKn  
 return CDialog::PreTranslateMessage(pMsg); u(3 uZ:  
} XK\nOHLS  
!pU^?Hy=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F|6"-*[RS  
{ d)U(XiK'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ T^] ]z}k  
  SaveBmp(); zd2_k 9  
  return FALSE; l"[.Q>d  
} h-Y>>l>PW0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {hN\=_6*EW  
 CMenu pop; ;;i419  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); DM v;\E~D  
 CMenu*pMenu=pop.GetSubMenu(0); JE{ cZ<NNH  
 pMenu->SetDefaultItem(ID_EXITICON); l'[;q '  
 CPoint pt; ^!exH(g  
 GetCursorPos(&pt); d , g~.iS~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4 y}z+4  
 if(id==ID_EXITICON) G6{ PrV#  
  DeleteIcon(); }@6yROy.  
 else if(id==ID_EXIT) GIYdI#0RC  
  OnCancel(); <t!0{FJ  
 return FALSE; :9L}jz  
} $X:,Q,?  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `K0.6i [p  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +%[, m&  
 AddIcon(); gktlwiCZ  
 return res; U~sC%Ri-@U  
} |UlR+'rl  
n(z$u)Y  
void CCaptureDlg::AddIcon() .e5@9G.jb  
{ 4MDVR/Z7  
 NOTIFYICONDATA data; +KExK2=  
 data.cbSize=sizeof(NOTIFYICONDATA); Y:+:>[F  
 CString tip; aBQ--Sz  
 tip.LoadString(IDS_ICONTIP); xzz@Wc^_  
 data.hIcon=GetIcon(0); YH%U$eS#g  
 data.hWnd=GetSafeHwnd(); \Qv:7;?  
 strcpy(data.szTip,tip); v@2?X4n  
 data.uCallbackMessage=IDM_SHELL; aVV E 2:M  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .AX%6+o  
 data.uID=98; l0yflFGr  
 Shell_NotifyIcon(NIM_ADD,&data); &{WEtaXaa  
 ShowWindow(SW_HIDE); K4NzI9@  
 bTray=TRUE; Smy J@.L"  
} uU$/4{  
k-*k'S_  
void CCaptureDlg::DeleteIcon() 8zeD%Uv  
{ V^.Z&7+E`_  
 NOTIFYICONDATA data; 2&s(:=  
 data.cbSize=sizeof(NOTIFYICONDATA); T|oDJ]\J  
 data.hWnd=GetSafeHwnd(); /YwwG;1  
 data.uID=98; 26zif  
 Shell_NotifyIcon(NIM_DELETE,&data); FDFVhcr  
 ShowWindow(SW_SHOW); e6jdSn  
 SetForegroundWindow(); xXV15%&  
 ShowWindow(SW_SHOWNORMAL); b0%#=KMi  
 bTray=FALSE; gi@&Mr)fS  
} DT;;4- {  
Z'^.H3YvL  
void CCaptureDlg::OnChange() ;SA+| ,  
{ $1Z3yb^  
 RegisterHotkey(); -xH3}K%  
} JP]4* l  
w+%p4VkA<r  
BOOL CCaptureDlg::RegisterHotkey() m`XaY J  
{ \q-["W34  
 UpdateData(); fB; o3!y  
 UCHAR mask=0; }LIf]Y K  
 UCHAR key=0; 9% P$e=Ui#  
 if(m_bControl) '+^XL6$L  
  mask|=4; 8fWnKWbbjw  
 if(m_bAlt) blbzh';0}  
  mask|=2; 'i/"D8  
 if(m_bShift) nM$-L.dG  
  mask|=1; @M }`nKXM  
  key=Key_Table[m_Key.GetCurSel()]; u*Y!=IT  
 if(bRegistered){ TSL/zTLDJ  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); mp]UUpt  
  bRegistered=FALSE; #eI` l`}  
 } +(q r{G?  
 cMask=mask; 6l>016 x  
 cKey=key; QmPHf*w[  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); TlQ5'0&I  
 return bRegistered; Tkf4`Gxd  
} %%O_:@9x,  
c$hoqi |tD  
  四、小结 y3V47J2o  
t&bE/i_T  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
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