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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: T>?~eYHXs  
  ?#'qY6 ^  
  一、实现方法 $W2AiE[Wm  
+J} 41  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:  E9i WGSE  
x9=lN^/4  
#pragma data_seg("shareddata") -:QyWw/d  
HHOOK hHook =NULL; //钩子句柄 `#V"@Go  
UINT nHookCount =0; //挂接的程序数目 *VU Xw@  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 U7W ct %  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 6!$S1z#wM  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey bu.36\78  
static int KeyCount =0;  ;"3Mm$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 4 R]|  
#pragma data_seg() > h9U~#G=  
|Yx8Ez  
  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。 g 0L 4  
UpITx]y?"m  
  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: [|YMnV<B  
">o/\sXeH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :X#(T- !t  
cKey,UCHAR cMask) ch&r.  
{ 4Y]`> ;w  
 BOOL bAdded=FALSE; =P!Vi6[gF~  
 for(int index=0;index<MAX_KEY;index++){ -} (W=r\  
  if(hCallWnd[index]==0){ C9z{8 ;  
   hCallWnd[index]=hWnd; Um~jp:6p  
   HotKey[index]=cKey; }MX`WW0\]Z  
   HotKeyMask[index]=cMask; ~?p > L  
   bAdded=TRUE; ms$o,[  
   KeyCount++; %wO~\:F8  
   break; X}ZOjX!  
  } 1li`+~L F  
 } (#:Si~3  
 return bAdded; >iCMjT]4  
} _I9TG.AA.  
//删除热键 GHkSU;})  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p#&6Ed*V  
{ 'D4NPG`z  
 BOOL bRemoved=FALSE; ^~0 r+w61  
 for(int index=0;index<MAX_KEY;index++){ .cb mCFXL  
  if(hCallWnd[index]==hWnd){ Zj JD@,j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %F7aFvl*  
    hCallWnd[index]=NULL; ^ey\ c1K  
    HotKey[index]=0; WM#!X!Vo  
    HotKeyMask[index]=0; AIeYy-f  
    bRemoved=TRUE; 0C7"*H0 R  
    KeyCount--; bhI8b/  
    break; S$#Awen"@  
   } n5b N/  
  } H\S,^)drJ?  
 } 29GiNy+ob  
 return bRemoved; m4iR '~L}  
} BK +JHT  
h3:,Gbyap  
~7m+cWC-+  
  DLL中的钩子函数如下: CR/LV]G  
$qvNv[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Eg9502Bl~8  
{ 4 (yHD  
 BOOL bProcessed=FALSE; ql8:s>1T  
 if(HC_ACTION==nCode) s(dox; d  
 { k91Y"_&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 41.+3VP  
   switch(wParam) RsbrD8*AD  
   {  vw3W:TL  
    case VK_MENU: 2|cIu 'U  
     MaskBits&=~ALTBIT; >[p+L='  
     break; *-n$n  
    case VK_CONTROL: [`&cA#C9Yp  
     MaskBits&=~CTRLBIT; >A)he!I  
     break; ua{eri[  
    case VK_SHIFT: Ze~\=X" "  
     MaskBits&=~SHIFTBIT; ;HC"hEc!  
     break; P k,^q8;  
    default: //judge the key and send message U!Lws#\X  
     break; j04Q3d \f  
   } e#AB0-f  
   for(int index=0;index<MAX_KEY;index++){ qj|GAGrQ2  
    if(hCallWnd[index]==NULL) q\~7z1   
     continue; D Lu]d$G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b"gYNGgX  
    { +vQyHo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); < ;g0?M\  
     bProcessed=TRUE; JmBYD[h,  
    } kN_LD-  
   } h$k(|/+  
  } T7,tJk,(  
  else if((lParam&0xc000ffff)==1){ //有键按下 j_{gk"2:d`  
   switch(wParam) 5pDxFs=v  
   { 4uv }6&R  
    case VK_MENU: &O'yhAP] j  
     MaskBits|=ALTBIT; iCH Z{<k  
     break; #*~ (  
    case VK_CONTROL: .1}u0IbJ  
     MaskBits|=CTRLBIT; sC#Ixq'ls7  
     break; (d (whlF  
    case VK_SHIFT: M,9WF)p)V  
     MaskBits|=SHIFTBIT; 0t9G $23  
     break; Fm@GU  
    default: //judge the key and send message LR^b?.#>  
     break; IuTTMAt  
   } LvR=uD  
   for(int index=0;index<MAX_KEY;index++){ [ -%oO  
    if(hCallWnd[index]==NULL) w#o<qrpHf  
     continue; 0 cQf_o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :9)>!+|'  
    { l +#`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $Fo ,$  
     bProcessed=TRUE; iX,Qh2(ig  
    } vEb~QX0~  
   }  *Vc}W  
  } j/W#=\xz  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 f(3#5288  
   for(int index=0;index<MAX_KEY;index++){ &38Fj'l  
    if(hCallWnd[index]==NULL) lmod8B  
     continue; 3:C *'@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) MXhS\vF#m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9|go`^*.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 /E*P0y~KTW  
   } )~Q$ tM`  
  } TKmC/c  
 } UqAvFCy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); w0.#/6  
} 0D\FFfs  
f[z#=zv  
  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: 3U}z?gP[  
CfVz'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {d3r>Ub)7d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =\q3;5[  
rsIjpPa  
  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: 1mB6rp  
U$-FQRM4K  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lKm?Xu'yH  
{ osnDW aN  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0wc+<CUW  
 { t%/5$<!b  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :]]amziP&  
  SaveBmp(); $k!t&G  
  return FALSE; Zw }7vD0  
 } ld3,)ZY  
 …… //其它处理及默认处理 oc15!M3$  
} D3jP hPy.  
UH)A n:9  
Z(V 4"x7F  
  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。 pIh@!C  
}wiq?dr  
  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。 BKGwi2]Ry  
){6;o& CC:  
  二、编程步骤 T$+}Srb  
Z,!Rj7wZ  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 7`P(LQAr!  
&)wQ|{P~k  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; j6Vuj/+}  
?.4u'Dkn=  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 9zX\i oT  
F[J;u/Z  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 7%o\O{,U  
 - @  
  5、 添加代码,编译运行程序。 =EIsqk^*  
(5atU |8r  
三、程序代码 NE/3aU  
k1]?d7g$w  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL r*kk/ $,2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /at#[Pw~01  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ H >RGX#|  
#if _MSC_VER > 1000 JNZKzyJ9K  
#pragma once R^K<u#>K  
#endif // _MSC_VER > 1000 aZmSCi:&'  
#ifndef __AFXWIN_H__ 2Qn%p[#n  
#error include 'stdafx.h' before including this file for PCH `B^?Za,xN  
#endif VD1*br^,  
#include "resource.h" // main symbols KC  
class CHookApp : public CWinApp ^^v\ T  
{ "F0,S~tZZ  
 public: hLBX,r)u  
  CHookApp(); }|x]8zL8G  
  // Overrides 6 Iup4sP  
  // ClassWizard generated virtual function overrides d,$[633It}  
  //{{AFX_VIRTUAL(CHookApp) Vls*fY:W  
 public: Um*{~=;u  
  virtual BOOL InitInstance(); M34*$>bk  
  virtual int ExitInstance(); Z EG  
  //}}AFX_VIRTUAL u< ):gI  
  //{{AFX_MSG(CHookApp) k8w8I$QEM  
  // NOTE - the ClassWizard will add and remove member functions here. Iy"   
  // DO NOT EDIT what you see in these blocks of generated code ! y\ouIsI77  
  //}}AFX_MSG 96 C|R  
  DECLARE_MESSAGE_MAP() n#m )]YQC  
}; b`1P%OjC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); h v9s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E4WoKuE1$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4Jht{#IIG  
BOOL InitHotkey(); A/ GEDG ?  
BOOL UnInit(); ]x~H"<V  
#endif QHA<7Wg  
xH*OEzN  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Ff.gRx  
#include "stdafx.h" c~p4M64  
#include "hook.h" R$v{ p[  
#include <windowsx.h> [<bfwTFsl  
#ifdef _DEBUG  8sE@?,  
#define new DEBUG_NEW uGgR@+7?Z  
#undef THIS_FILE 4,FuQ}  
static char THIS_FILE[] = __FILE__; }>SHTHVye  
#endif WtdWD_\%Y\  
#define MAX_KEY 100 ;c~6^s`2  
#define CTRLBIT 0x04 \Q]2Zq  
#define ALTBIT 0x02 tTC[^Dji  
#define SHIFTBIT 0x01 TVYO`9:CW  
#pragma data_seg("shareddata") ?. CA9!|   
HHOOK hHook =NULL; +|\dVe.  
UINT nHookCount =0; 1)M3*h3  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey L{osh0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6 70g|&v.  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Pgb<;c:4  
static int KeyCount =0; 1P&c:n  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift O'o`  
#pragma data_seg() QIG MP=!j  
HINSTANCE hins; z]~B@9l  
void VerifyWindow(); ]yA| m3^2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) (l9U7^S"{K  
//{{AFX_MSG_MAP(CHookApp) !*N#}6Jd  
// NOTE - the ClassWizard will add and remove mapping macros here. L;>tuJY1  
// DO NOT EDIT what you see in these blocks of generated code! oE)tK1>;H  
//}}AFX_MSG_MAP ~M+|g4W%  
END_MESSAGE_MAP() ]w! x  
CShVJ:u+K\  
CHookApp::CHookApp() R )ejIKtY  
{ hE+6z%A8  
 // TODO: add construction code here, %I[(`nb  
 // Place all significant initialization in InitInstance .-fJ\`^mi  
} hyFq>XFo  
TRG"fVR  
CHookApp theApp; ;,4Z5+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Rm"lRkY4I[  
{ 'V .4Nhd  
 BOOL bProcessed=FALSE; Spt[b.4mF  
 if(HC_ACTION==nCode) EzwYqw  
 { _q M'm^z5  
  if((lParam&0xc0000000)==0xc0000000){// Key up N%n#mV;  
   switch(wParam) *p p1U>,  
   { eQJLyeR+  
    case VK_MENU: &A]*"lt|w  
     MaskBits&=~ALTBIT; J3g>#N]='(  
     break; V_(lZDjh*  
    case VK_CONTROL: -N~*h  
     MaskBits&=~CTRLBIT; PUF"^9v  
     break; hP,SvN#!2  
    case VK_SHIFT: [K x_%Le  
     MaskBits&=~SHIFTBIT; 0}-&v+  
     break; lD. PNwM  
    default: //judge the key and send message On d"Eq=r  
     break; R2Lq,(@-  
   } /w`{]Ntgu  
   for(int index=0;index<MAX_KEY;index++){ 3Ud&B  
    if(hCallWnd[index]==NULL) rN8 ZQiJC  
     continue; p~$\@8@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o~2bk<]z  
    { a|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ) ^!oM  
     bProcessed=TRUE; &}wKC:LSP  
    } V!a|rTU6  
   } `%"zq"1`0  
  } C.FGi`rrm  
  else if((lParam&0xc000ffff)==1){ //Key down )d_)CuUBe  
   switch(wParam) &> p2N  
   { +);o{wfW  
    case VK_MENU: (SU*fD!t  
     MaskBits|=ALTBIT; YNH>^cD1  
     break; t-3wjS1v  
    case VK_CONTROL: ?9 m3y0  
     MaskBits|=CTRLBIT; _T<ney}Y<  
     break; C5*j0}  
    case VK_SHIFT: kT[]^Jtc  
     MaskBits|=SHIFTBIT; &7XB $  
     break; 0+m"eGwTm  
    default: //judge the key and send message (<=qW_iW  
     break; lD _  u  
   } gU0}.b  
   for(int index=0;index<MAX_KEY;index++) p%G4Js.  
   { LdDkd(k  
    if(hCallWnd[index]==NULL) DbH{; Fb  
     continue; I7hPE7V+1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j+88J  
    { ig7)VKr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3-FS} {,  
     bProcessed=TRUE; ,iB)8Km@U  
    } BAx)R6kS;  
   } JOx75}  
  } ^Qs-@]E-  
  if(!bProcessed){ {uDL"~^\  
   for(int index=0;index<MAX_KEY;index++){ ak;fCx&  
    if(hCallWnd[index]==NULL) hJrxb<9@Y0  
     continue; P5%DvZB$w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) AuX&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tQF7{F-}  
   } NGd|7S[^+c  
  } P>0j]?RB  
 } -!I.:97 N  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); GKZn|<Y|{c  
} axxd W)+K  
@$F(({?  
BOOL InitHotkey() acRPKTs H  
{ jgs kK  
 if(hHook!=NULL){ ]j}zN2[A  
  nHookCount++; iePpJ>(  
  return TRUE; eWhv X9 <  
 } {Ejv8UdA9  
 else Z8}Zhe.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ACU0  
  if(hHook!=NULL) `Btdp:j8i  
   nHookCount++; e-]k{_wm  
  return (hHook!=NULL); (b GiBsb  
} .1t$(]CyC  
BOOL UnInit() KQNSYI7a  
{ $xvEYK  
 if(nHookCount>1){ ? Ls]k  
  nHookCount--; Km 'd=B>Jy  
  return TRUE; VjMd&>G  
 } fFqK.^Tn  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .]k(7F!W  
 if(unhooked==TRUE){ %Jq(,u  
  nHookCount=0; Ad+-/hxc  
  hHook=NULL; a' .o  
 } 5lxC**NA  
 return unhooked; <(>v|5K0]  
} Iu[^"  
6aX m9 J  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  /d0LD  
{ KVSy^-."  
 BOOL bAdded=FALSE; Rl=NVo  
 for(int index=0;index<MAX_KEY;index++){ a^)7&|$ E  
  if(hCallWnd[index]==0){ 1Yz1/gFj  
   hCallWnd[index]=hWnd; _U.8\J2  
   HotKey[index]=cKey; YM1tP'4j@  
   HotKeyMask[index]=cMask; 9 /t}S6b{  
   bAdded=TRUE; 66[yL(*+  
   KeyCount++; H \.EK Z  
   break; ) ok_"wB  
  } tJ&S&[}  
 } +7sdQCO(Co  
 return bAdded; &julw;E  
} ~5:]Oux  
%[B &JhT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u8~.6]Ae  
{ ?$ Uk[  
 BOOL bRemoved=FALSE; )m\%L`+  
 for(int index=0;index<MAX_KEY;index++){ +4G uA0N6  
  if(hCallWnd[index]==hWnd){ DL2e 9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ceH7Rq:4W  
    hCallWnd[index]=NULL; R 7xV{o  
    HotKey[index]=0; f]J?-ks  
    HotKeyMask[index]=0; c)rI[P7Q  
    bRemoved=TRUE; deda=%w0  
    KeyCount--; {1#5\t>9yD  
    break; Nr|.]=K)5n  
   } -XPGl  
  } o5BOe1_Pw  
 } ~.VWrHC  
 return bRemoved; &.K8c phj  
} jO3Q@N0_  
j8hb  
void VerifyWindow() ZT"?W $  
{ dU:s^^f&R  
 for(int i=0;i<MAX_KEY;i++){ TJ?}5h5  
  if(hCallWnd!=NULL){ 2^[fUzL?  
   if(!IsWindow(hCallWnd)){ 1[} =,uaM  
    hCallWnd=NULL; nO\|43W  
    HotKey=0; O >n L;I  
    HotKeyMask=0; nUs)  
    KeyCount--; QI0ARdS  
   } z]gxkol\  
  } R+]Fh4t  
 } fR_)e:  
} 0 m";=:(w  
`w[0q?}"`  
BOOL CHookApp::InitInstance() b ?B"u^b!  
{ vTh-I&}:  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); d,8V-Dk+p  
 hins=AfxGetInstanceHandle(); TG{=~2  
 InitHotkey(); Tk|0 scjE^  
 return CWinApp::InitInstance(); MR#jI  
} D7sw;{ns  
I@pnZ-5  
int CHookApp::ExitInstance() c ?V,a`6  
{ Hu1w/PLq  
 VerifyWindow(); A;SRm<,  
 UnInit(); jMW|B  
 return CWinApp::ExitInstance(); 87YT;Z;U&  
} &EE6<-B-  
8ENAif   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file X xB*lX  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) xDRK^nmC  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >J.a, !  
#if _MSC_VER > 1000 wW6?.}2zU  
#pragma once vkc(-n  
#endif // _MSC_VER > 1000 HR['y9 U  
" &p\pR~  
class CCaptureDlg : public CDialog &7E0H{  
{ MCz +l0  
 // Construction 8%arA"#S  
 public: \ 8ulX>]  
  BOOL bTray; yw#P<8{/[  
  BOOL bRegistered; "y_$!KY%  
  BOOL RegisterHotkey(); h*_r=' E  
  UCHAR cKey; o'>jO.|  
  UCHAR cMask; 68;,hS*|6  
  void DeleteIcon(); x03GJy5  
  void AddIcon(); ] A<\ d  
  UINT nCount; 14s+ &  
  void SaveBmp(); 0EPF; Xx  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \n`UkxZn+  
  // Dialog Data SY>N-fW\H:  
  //{{AFX_DATA(CCaptureDlg) %do|>7MO@  
  enum { IDD = IDD_CAPTURE_DIALOG }; YjvqU /[3  
  CComboBox m_Key; Vxo3RwmR  
  BOOL m_bControl; */O6cF7  
  BOOL m_bAlt; 7QQ3IepP  
  BOOL m_bShift; {7Dc(gNS  
  CString m_Path; i T 4H@  
  CString m_Number; ndF Kw  
  //}}AFX_DATA IBES$[  
  // ClassWizard generated virtual function overrides ZZ[5Z =te?  
  //{{AFX_VIRTUAL(CCaptureDlg) <%qbU-  
 public: 9#O"^.Z !  
  virtual BOOL PreTranslateMessage(MSG* pMsg); "%,zB_ng\<  
 protected: ^R>&^"oI  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e] **Z,Z  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); c6BaC@2  
  //}}AFX_VIRTUAL *5*d8;@>  
  // Implementation FZj tQ{M  
 protected: k}F;e_  
  HICON m_hIcon; `.L8<-]W  
  // Generated message map functions 4)v\Dc/9i  
  //{{AFX_MSG(CCaptureDlg) < g6 [mS  
  virtual BOOL OnInitDialog(); KXicy_@DC`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); B<8Z?:3YS  
  afx_msg void OnPaint(); [#lPT'l  
  afx_msg HCURSOR OnQueryDragIcon(); DFE?H  
  virtual void OnCancel(); @@SG0YxZ  
  afx_msg void OnAbout(); A' dt WD  
  afx_msg void OnBrowse(); WdunI~&.  
  afx_msg void OnChange(); rh$%*l  
 //}}AFX_MSG dYf Vox;  
 DECLARE_MESSAGE_MAP() ]7h&ZF  
}; A n/)|B4  
#endif ZLE4 XB]  
s49 AF  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file h=d&@k\g  
#include "stdafx.h" 4;w_o9o  
#include "Capture.h" _F,@mQ$!  
#include "CaptureDlg.h" "9>#Q3<N  
#include <windowsx.h> -bZ^A~<O,  
#pragma comment(lib,"hook.lib") |Vd)7/LN  
#ifdef _DEBUG f\^FUJy  
#define new DEBUG_NEW Nl;rg*@o  
#undef THIS_FILE A4%0  
static char THIS_FILE[] = __FILE__; {^MR^4&}(  
#endif Rjm5{aa-  
#define IDM_SHELL WM_USER+1 ',J3^h!b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PuUqWW'^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cN&b$ 8O=%  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; y$4,r4cmR|  
class CAboutDlg : public CDialog ]C5JP~ #z  
{ O23f\pm&  
 public: I#uJdV|x  
  CAboutDlg(); QVzLf+R~  
  // Dialog Data 7Py8!  
  //{{AFX_DATA(CAboutDlg) ) ae/+Q8  
  enum { IDD = IDD_ABOUTBOX }; R6{%o:{  
  //}}AFX_DATA ;I5HMc_a"  
  // ClassWizard generated virtual function overrides Dc #iM0  
  //{{AFX_VIRTUAL(CAboutDlg) Tvf]OJ9N  
 protected: 6 `X#<#_&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ug UV`5w   
  //}}AFX_VIRTUAL TyGXDU  
  // Implementation D{a{$P r  
 protected: :tzCuK?e  
  //{{AFX_MSG(CAboutDlg) hj0uv6t.c  
  //}}AFX_MSG a/>={mb Ki  
  DECLARE_MESSAGE_MAP() lFI"U^xC  
}; .i[Tp6'%,  
o6B!ikz 8  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) sx*(JM}Be  
{ s {$c8  
 //{{AFX_DATA_INIT(CAboutDlg) iFS ?nZ~.  
 //}}AFX_DATA_INIT Jw;J$ u!d  
} i1|-  
ffuV$#  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) lEQn2+  
{ @}aK\  
 CDialog::DoDataExchange(pDX); $n(@hT>?  
 //{{AFX_DATA_MAP(CAboutDlg) S\g8(\u  
 //}}AFX_DATA_MAP ) 1H]a'j  
} X#+A?>Z]}<  
1wGd5>GDA  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) NZdQz  
 //{{AFX_MSG_MAP(CAboutDlg) {PYN3\N,  
 // No message handlers 64b9.5Bn  
 //}}AFX_MSG_MAP fv<($[0  
END_MESSAGE_MAP() Lrr6z05FQ  
B6$s*SXNp  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]yCmGt+b  
: CDialog(CCaptureDlg::IDD, pParent) }b6ja y  
{ b>I -4  
 //{{AFX_DATA_INIT(CCaptureDlg) $~zqt%}  
  m_bControl = FALSE; r(i<H%"Z  
  m_bAlt = FALSE; :^J(%zy  
  m_bShift = FALSE; '<4OA!,^)  
  m_Path = _T("c:\\"); O{SU,"!y  
  m_Number = _T("0 picture captured."); 63-`3R?;  
  nCount=0; jG{xFz>x  
  bRegistered=FALSE; pwU]r  
  bTray=FALSE; Y @pkfH  
 //}}AFX_DATA_INIT 7m@pdq5Ub  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 "+Xwc+v^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ad i5h  
} s~M!yuH  
t2tH%%Rs  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |$7!u DU8  
{ -D{~7&  
 CDialog::DoDataExchange(pDX); 1`B5pcuI  
 //{{AFX_DATA_MAP(CCaptureDlg) z\fD}`^8  
  DDX_Control(pDX, IDC_KEY, m_Key); |MTgKEsn  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); bF?EuL  
  DDX_Check(pDX, IDC_ALT, m_bAlt); AB}Qd\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); X+bLLW>&  
  DDX_Text(pDX, IDC_PATH, m_Path); 6Y\9h)1Jo  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Njz,y}\  
 //}}AFX_DATA_MAP Oh<Z0M)  
} v8-F;>H  
_qJ[~'m<^C  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2ORWdR.b  
//{{AFX_MSG_MAP(CCaptureDlg) oBKZ$&_h  
 ON_WM_SYSCOMMAND() 49Ht I9@  
 ON_WM_PAINT() Q.M3rRh  
 ON_WM_QUERYDRAGICON() K& 2p<\2  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ruF+X)  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) <(#cPV@j  
 ON_BN_CLICKED(ID_CHANGE, OnChange) b\]"r x (  
//}}AFX_MSG_MAP Gash3}+  
END_MESSAGE_MAP() N|7<*\o  
"0zMx`Dh  
BOOL CCaptureDlg::OnInitDialog() D.R5-  
{ [9aaHf@'  
 CDialog::OnInitDialog(); l<z[)fE{uS  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Kq6m5A]z  
 ASSERT(IDM_ABOUTBOX < 0xF000); jwAO{.}T1r  
 CMenu* pSysMenu = GetSystemMenu(FALSE); gh i!4  
 if (pSysMenu != NULL) B:+}^=  
 { `C_#EU-  
  CString strAboutMenu; 98o;_tU'  
  strAboutMenu.LoadString(IDS_ABOUTBOX); G?>~w[#mQR  
  if (!strAboutMenu.IsEmpty()) /i DS#l\0  
  { O&d(FJZ  
   pSysMenu->AppendMenu(MF_SEPARATOR); ukq9Cjs  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R!}B^DVt  
  } uyjZmT/-  
 } YJeZ{Wws  
 SetIcon(m_hIcon, TRUE); // Set big icon nGX~G^mZ  
 SetIcon(m_hIcon, FALSE); // Set small icon _Y\@{T;^Zb  
 m_Key.SetCurSel(0); vk;>#yoox  
 RegisterHotkey(); !Me%W3  
 CMenu* pMenu=GetSystemMenu(FALSE); vaR0`F  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,ulNap"R  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Nk}Hvg*(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;$[o7Qm5r  
 return TRUE; // return TRUE unless you set the focus to a control VJHHC.Kz  
} 7b@EvW6X}  
!i}G>*XH,  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) t6-c{ZX>A  
{ q2gc.]K \  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~3f#cEP>d}  
 { [>Q{70 c[  
  CAboutDlg dlgAbout; Q 7B)t;^  
  dlgAbout.DoModal(); jnH44  
 } ecf<(Vl}  
 else >[ 72]<6  
 { 3^1)W!n/  
  CDialog::OnSysCommand(nID, lParam); SL@Vk(  
 } [ .dNX  
} fp12-Hk ~  
T']*h8  
void CCaptureDlg::OnPaint() NF&\<2kX  
{ 2Ni{wg"  
 if (IsIconic()) VFA1p)n  
 { s/Q}fW$ex  
  CPaintDC dc(this); // device context for painting -uO< ]  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); rhNdXYY>  
  // Center icon in client rectangle K=`*cSU>  
  int cxIcon = GetSystemMetrics(SM_CXICON); b'vJPv~hI  
  int cyIcon = GetSystemMetrics(SM_CYICON); >KGQ#hnH  
  CRect rect; @$+l ^"#-]  
  GetClientRect(&rect); d5^ipu  
  int x = (rect.Width() - cxIcon + 1) / 2; =7Tbu'O;  
  int y = (rect.Height() - cyIcon + 1) / 2; dVe3h.,[v  
  // Draw the icon K7e<hdP_#  
  dc.DrawIcon(x, y, m_hIcon); 0b*a2_|8k  
 } Z][?'^`^!  
 else du'$JtZo  
 { z{!wQ~ j  
  CDialog::OnPaint(); / HaS.  
 } :p8JO:g9  
} ?7a< V+V:  
C .YtjLQP$  
HCURSOR CCaptureDlg::OnQueryDragIcon() rw+0<r3|K  
{ nR"k %$  
 return (HCURSOR) m_hIcon; .fD k5uo  
} QfwGf,0p  
c%uhQ 62  
void CCaptureDlg::OnCancel() i1aS2gFi_  
{ }zLe;1Tx  
 if(bTray) hih`:y  
  DeleteIcon(); GIZNHG   
  CDialog::OnCancel(); /hI#6k8o_  
} _Q.3X[88C  
Y>%A*|U%  
void CCaptureDlg::OnAbout() X4%*&L  
{ ;y5cs;s  
 CAboutDlg dlg; @X\nY</E#M  
 dlg.DoModal(); ?kS5=&<  
} hb? |fi  
_MMz x2}  
void CCaptureDlg::OnBrowse() uLL#(bhDr  
{ Tb{,WUJg2  
 CString str; UbQeN  
 BROWSEINFO bi; 7Jc=`Zm'  
 char name[MAX_PATH]; zWjGGTP~3&  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); kO2im+y  
 bi.hwndOwner=GetSafeHwnd(); WQ"ZQ  
 bi.pszDisplayName=name; #NL1N_B  
 bi.lpszTitle="Select folder"; zROyG  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; D-,sF8{ i  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); {bc<0  
 if(idl==NULL) .v;2Q7X  
  return; h)A+5^:^  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); A]=?fyPh{'  
 str.ReleaseBuffer(); |ZRl.C/e  
 m_Path=str; hj4A&`2  
 if(str.GetAt(str.GetLength()-1)!='\\') 2ix_,yTO  
  m_Path+="\\"; Yq5}r?N  
 UpdateData(FALSE); !7bC\ {  
} dm,bZHo  
qRB%G<H  
void CCaptureDlg::SaveBmp() aG=Y 6j G  
{ VQo7 se1P  
 CDC dc; 7c;59$2(  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); <T0-m?D_$  
 CBitmap bm; R^8Opf_UN  
 int Width=GetSystemMetrics(SM_CXSCREEN); < W&~tVv  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2 ] 4R`[#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Po^2+s(fY  
 CDC tdc; n\cP17dr  
 tdc.CreateCompatibleDC(&dc); 88G[XkL$2  
 CBitmap*pOld=tdc.SelectObject(&bm); ;=uHK'{  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); rx^pGVyg  
 tdc.SelectObject(pOld); 0/] @#G2  
 BITMAP btm; 7r}gS2d  
 bm.GetBitmap(&btm); \t!+]v8f8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; BY \p?79  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |AWu0h\keO  
 BITMAPINFOHEADER bih; }3?M0:  
 bih.biBitCount=btm.bmBitsPixel; =M(\R8  
 bih.biClrImportant=0; 0!(Ii@m=N  
 bih.biClrUsed=0; =20Q! wcu  
 bih.biCompression=0; Rbr vY  
 bih.biHeight=btm.bmHeight; ,][+:fvS  
 bih.biPlanes=1; GXHk{G@TS  
 bih.biSize=sizeof(BITMAPINFOHEADER); &Rn/ c}[{  
 bih.biSizeImage=size; /!%P7F  
 bih.biWidth=btm.bmWidth; 8n&",)U  
 bih.biXPelsPerMeter=0; EkTen:{G  
 bih.biYPelsPerMeter=0; P, S9gG9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 4AF" +L  
 static int filecount=0; f-{[ushj  
 CString name; IndNR:"g  
 name.Format("pict%04d.bmp",filecount++); EO| kiC   
 name=m_Path+name; `_v-Y`Z  
 BITMAPFILEHEADER bfh; S?8q.59  
 bfh.bfReserved1=bfh.bfReserved2=0; H!45w;,I  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ~$Mp>ZB2W  
 bfh.bfSize=54+size; 0kCUz  
 bfh.bfOffBits=54; _k j51=  
 CFile bf; LI nN-b#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ vys*=48g  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <!w-op2@ir  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \XB71DUF  
  bf.WriteHuge(lpData,size); ec]ksw6T+  
  bf.Close(); - z|idy{  
  nCount++; H=yD}!j  
 } G&Cl:CtC  
 GlobalFreePtr(lpData); C ]r$   
 if(nCount==1) j?&FK  
  m_Number.Format("%d picture captured.",nCount); (bT\HW%m  
 else XhIgzaGVu  
  m_Number.Format("%d pictures captured.",nCount); ^ePSI|EW  
  UpdateData(FALSE); WVo%'DtF`  
} ZE=~ re  
ipbVQ7  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [C d 2L&9  
{ U9N}6a=  
 if(pMsg -> message == WM_KEYDOWN) %NAz(B  
 { @Sv  ?Ar  
  if(pMsg -> wParam == VK_ESCAPE) `__CL )N|  
   return TRUE; ?Z14l0iZ%d  
  if(pMsg -> wParam == VK_RETURN) ucA6s:!={  
   return TRUE; 1C|j<w=i  
 } ]1Q\wsB  
 return CDialog::PreTranslateMessage(pMsg); <R !qOQI  
} Hh qx)u  
+ S%+Ku  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +h9CcBd  
{ Ak9W8Z}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4ErDGYg}  
  SaveBmp(); }e@j(*8  
  return FALSE; M(2[X/t  
} h+Z|s  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^SjGNg^ 7D  
 CMenu pop; [M;P:@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ot,sMRk'  
 CMenu*pMenu=pop.GetSubMenu(0); riBT5  
 pMenu->SetDefaultItem(ID_EXITICON); Y.hrU*[J0  
 CPoint pt; +"p" ,Z  
 GetCursorPos(&pt); ]XP[tLY Y  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  vG  
 if(id==ID_EXITICON) =)bZSb"<"  
  DeleteIcon(); z_Qw's  
 else if(id==ID_EXIT) |H@M-  
  OnCancel(); ~XZ1,2jA/  
 return FALSE; B\("08x  
} dj]sr!q+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Nf;vUYP  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) TvQAy/Y0  
 AddIcon(); <"\K|2Sg  
 return res; i "-#1vy=  
} f|q6<n_nM  
.z{7 rH  
void CCaptureDlg::AddIcon() EG1SIEo  
{ g^]Q*EBa  
 NOTIFYICONDATA data; UIu'x_qc  
 data.cbSize=sizeof(NOTIFYICONDATA); klx4Mvq+/@  
 CString tip; "?N`9J|j)~  
 tip.LoadString(IDS_ICONTIP); @lj  
 data.hIcon=GetIcon(0); Cw+ (,1  
 data.hWnd=GetSafeHwnd(); 4 bJ3uIP#  
 strcpy(data.szTip,tip); I&cb5j]C  
 data.uCallbackMessage=IDM_SHELL; t^7R6y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; y k#:.5H  
 data.uID=98; @E==~ b  
 Shell_NotifyIcon(NIM_ADD,&data); ~ib#x~Db  
 ShowWindow(SW_HIDE); @L~y%#  
 bTray=TRUE; '17=1\Ss6;  
} ~pF'Qw" z|  
o+tY[UX  
void CCaptureDlg::DeleteIcon() &bL1G(}  
{ "@f`O  
 NOTIFYICONDATA data; DL~LSh  
 data.cbSize=sizeof(NOTIFYICONDATA); 4$|G$h  
 data.hWnd=GetSafeHwnd(); @*_K#3  
 data.uID=98; g`Rs;  
 Shell_NotifyIcon(NIM_DELETE,&data); ae^xuM?7  
 ShowWindow(SW_SHOW); c{852R  
 SetForegroundWindow(); Y8AU<M  
 ShowWindow(SW_SHOWNORMAL); %V+,#  
 bTray=FALSE; Us%VB q  
} /g8yc'{p  
:]//{HF  
void CCaptureDlg::OnChange() dIf Jr}ih  
{ t /47lYN)  
 RegisterHotkey(); [UI bO@e  
} ZPMEN,Dw  
cdh1~'q/  
BOOL CCaptureDlg::RegisterHotkey() 9j,zaGD0  
{ 7"QcvV@p  
 UpdateData(); +(P;4ZOmB  
 UCHAR mask=0; G_o/ lIz"  
 UCHAR key=0; Onc!5L  
 if(m_bControl) |Jq/kmn  
  mask|=4; >kB?C!\  
 if(m_bAlt) ck@[% ?  
  mask|=2; oOD|FrlY  
 if(m_bShift) 5q) Eed  
  mask|=1; {<]abO  
  key=Key_Table[m_Key.GetCurSel()]; :WxMv~e{U  
 if(bRegistered){ KS| $_-7 u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Y0b.utR&  
  bRegistered=FALSE; `Y[zF1$kz^  
 } M9N|Ql  
 cMask=mask; _{ba  
 cKey=key; &=/.$i-w$  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5(F!* 6i>  
 return bRegistered; kPxEGuL'  
} 7v?Ygtv  
91,\y  
  四、小结 x x 'XR'zK  
t4<#k=  
  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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