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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: I FsE!oDs4  
  H8&p<=  
  一、实现方法 J_PH7Z*=,  
'G8 ?'u_)  
  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: B52yaG8C  
&iNS?1a%f=  
#pragma data_seg("shareddata") }z wX  
HHOOK hHook =NULL; //钩子句柄 3htq[Ren  
UINT nHookCount =0; //挂接的程序数目 <#y*h8IZ@t  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 :=9<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 qp>N^)>  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }#6xFTH  
static int KeyCount =0; :m K xa  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ]v\^&7pW  
#pragma data_seg() qBYg[K>  
T#@{G,N  
  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。 RDJ+QOVKg  
26.)Ur<F  
  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: &tj0M.-  
'w.}2(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,hWcytzEw  
cKey,UCHAR cMask) =IZ[_ /@  
{ _{$fA6C  
 BOOL bAdded=FALSE; 4&{!M _  
 for(int index=0;index<MAX_KEY;index++){ &s8<6P7  
  if(hCallWnd[index]==0){ PNpu*# Z`  
   hCallWnd[index]=hWnd; I8u!\F  
   HotKey[index]=cKey; 59 <hV?  
   HotKeyMask[index]=cMask; zsVcXBz  
   bAdded=TRUE; =((yWn+t  
   KeyCount++; OPuj|%Wgw  
   break; Blk}I  
  } 'Jydu   
 } xQU"A2{}>  
 return bAdded; 3z3_7XI  
} .'j29 6[u  
//删除热键  ?Vc0)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) VI_+v[Hk/  
{ j (ygQ4T  
 BOOL bRemoved=FALSE; b7Oj<! Wo`  
 for(int index=0;index<MAX_KEY;index++){ w2OsLi Sv  
  if(hCallWnd[index]==hWnd){ Od{jt7<j#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ SkHYXe"]  
    hCallWnd[index]=NULL; :, _!pe;H  
    HotKey[index]=0; ?3q@f\fZ  
    HotKeyMask[index]=0; Wp[9beI*M  
    bRemoved=TRUE; dZ]Rqr _!  
    KeyCount--; 3vW4<:Lgy  
    break; {kL&Rv%'  
   } -V5w]F'  
  } d1]i,C~Y  
 } YQd:M%$  
 return bRemoved; 6kR\xP]Kr  
} `PlOwj@u0`  
M0w/wt|  
G1d(,4Xp  
  DLL中的钩子函数如下: U~H?4Izl=  
~<)vKk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g"K>5Cb  
{ Ck'aHe22'  
 BOOL bProcessed=FALSE; ,_ .v_  
 if(HC_ACTION==nCode) fS=hpL6]@  
 { y1pu R7  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 h<x4YB5Mj  
   switch(wParam) zT#`qCbT'J  
   {  P^)q=A8Z#  
    case VK_MENU: :iPy m}CE  
     MaskBits&=~ALTBIT; Y; ) .+si  
     break; +L%IG  
    case VK_CONTROL: %J~WC$=Qv  
     MaskBits&=~CTRLBIT; uQ/h'v  
     break; nxo+?:**  
    case VK_SHIFT: )L5i&UK.  
     MaskBits&=~SHIFTBIT; 9 OT,TpA  
     break; MX|H}+\  
    default: //judge the key and send message EWj gI_-  
     break; ig!7BxM)<h  
   } /+|#^:@  
   for(int index=0;index<MAX_KEY;index++){ (zcLx;N  
    if(hCallWnd[index]==NULL) ae+*=,  
     continue; ",Cr,;]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3tAU?sV!  
    { bt/ =Kq#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); y2|R.EU\m<  
     bProcessed=TRUE; p $`92Be/  
    } rcN 9.1  
   } (u1m]WYL  
  } `{Tk@A_yd  
  else if((lParam&0xc000ffff)==1){ //有键按下 p/ GVTf  
   switch(wParam) bPbb\|u0d  
   { l.+yn91%>  
    case VK_MENU: 3V<&|  
     MaskBits|=ALTBIT; >I"V],d!6  
     break; q_[G1&MC  
    case VK_CONTROL: 5&!c7$K0  
     MaskBits|=CTRLBIT; {XCf-{a]~  
     break; 9KuD(EJS  
    case VK_SHIFT: G }nO@  
     MaskBits|=SHIFTBIT; t18$x "\4k  
     break; `3_lI~=eH  
    default: //judge the key and send message yxWO [ Z  
     break; ec3<%+0f  
   } R.9V,R5  
   for(int index=0;index<MAX_KEY;index++){ f!_ ctp  
    if(hCallWnd[index]==NULL) Rl~T$ Ey  
     continue; `'S0*kMT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X[yNFW}S2W  
    { 3G}AH E4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9&]M**X  
     bProcessed=TRUE; S.*~C0"  
    } .ic:`1  
   } <n"C,  
  } LW)H"6v  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 /0MDISQy9  
   for(int index=0;index<MAX_KEY;index++){ x2Lq=zwJ  
    if(hCallWnd[index]==NULL) zCaT tb|@  
     continue; ;3eKqr0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) l@Z6do  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); iA }vKQ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 YX*x&5]lq  
   } `{v?6:G:Q  
  } sBX-X$*N  
 } ^Q<mV*~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Wi. 5Y{  
} t<iEj"5  
X;F8_+Np  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: I^\&y(LJF  
*XOJnyC_H  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &EGqgNl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q'[}9e`Q  
w*9br SK  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 26?W nu60  
W#fZ1E6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) da!P0x9p  
{ ] y{WD=T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) OPJ: XbG  
 { Y$K!7Kq  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 CT a#Q,  
  SaveBmp(); .wA+S8}S  
  return FALSE; t&q N: J  
 } jEdtJ EPa  
 …… //其它处理及默认处理 w'4AJ Q|;  
} :nN1e  
W*DVi_\$y  
=<@2#E)  
  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。 ! |waK~jK  
?4H#G)F  
  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。 rf:XRJ <4  
VXBY8;+Yp  
  二、编程步骤 pO  Iq%0]  
{@Yb%{+  
  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"; 8LkP)]4^sO  
IA zZ1#/3  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; "^j>tii  
Rgy- OA  
  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; /&#XhrT  
POI.]1i  
  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; o Pci66  
h5_G4J{1  
  5、 添加代码,编译运行程序。 A5:qKaAq  
:#E*Y8-  
三、程序代码 s'aip5P  
}TQ{`a@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Gc]~w D$  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) wm{3&m  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ -ezY= 0Q&  
#if _MSC_VER > 1000 gF=jf2{YX  
#pragma once J&/lx${  
#endif // _MSC_VER > 1000 JG[o"&Sd  
#ifndef __AFXWIN_H__ +6$g! S5{  
#error include 'stdafx.h' before including this file for PCH 8(g:HR*;  
#endif b+-f.!j  
#include "resource.h" // main symbols [H\:pP8t  
class CHookApp : public CWinApp 54;J8XT7  
{ AE`We$!  
 public: X[s8X!#  
  CHookApp(); =h6 sPJ  
  // Overrides b !@Sn/  
  // ClassWizard generated virtual function overrides qW:)!z3\  
  //{{AFX_VIRTUAL(CHookApp) G|w=ez  
 public: , ^F)L|  
  virtual BOOL InitInstance(); GDhE[of  
  virtual int ExitInstance(); 4D%9Rc0 G  
  //}}AFX_VIRTUAL '3]p29v{  
  //{{AFX_MSG(CHookApp) g[ 0<m#"  
  // NOTE - the ClassWizard will add and remove member functions here. v0Dq@Q1  
  // DO NOT EDIT what you see in these blocks of generated code ! aJL^AG  
  //}}AFX_MSG 9j ]sD/L5q  
  DECLARE_MESSAGE_MAP() PjT=$]  
}; EpS(o>'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _Y=2/*y^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (iJ1 ;x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (`>voi<^  
BOOL InitHotkey(); aSuM2  
BOOL UnInit(); [XRCLi}  
#endif \$aF&r<R  
;4M><OS!  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. K3uG2g(>2  
#include "stdafx.h" O1 .w,U  
#include "hook.h" @~<j&FTT  
#include <windowsx.h> 9][(Iu]h7  
#ifdef _DEBUG _rV5E  
#define new DEBUG_NEW IKMeJ(:S  
#undef THIS_FILE L@75- T  
static char THIS_FILE[] = __FILE__; o-xDh7v  
#endif {U 'd}Q  
#define MAX_KEY 100 ihh4pD27g  
#define CTRLBIT 0x04 #po5_dE\*  
#define ALTBIT 0x02 nzjkX4KV  
#define SHIFTBIT 0x01 jztq.2-c#  
#pragma data_seg("shareddata") kt[:@Nda9  
HHOOK hHook =NULL; @prG%vb"  
UINT nHookCount =0; -/_L*oYli  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey /&u<TJ4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Wv__ wZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey cJM:  
static int KeyCount =0; KZ!3j_pKy  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ZYf2XI(_"  
#pragma data_seg() ug{R 3SS  
HINSTANCE hins; -p-B2?)A  
void VerifyWindow(); h/x0]@M&  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $Vc~/>  
//{{AFX_MSG_MAP(CHookApp) DC1'Kyk  
// NOTE - the ClassWizard will add and remove mapping macros here. `cx]e  
// DO NOT EDIT what you see in these blocks of generated code! Lokl2o `  
//}}AFX_MSG_MAP pLMRwgzr  
END_MESSAGE_MAP() K"<PGOF  
AamVms  
CHookApp::CHookApp() b{fQ|QD{^E  
{ \#68;)+=  
 // TODO: add construction code here, ,!V]jP)  
 // Place all significant initialization in InitInstance yq+!czlZ  
} J5h+s-'  
[D5t{[i  
CHookApp theApp; tbnH,*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0!z@2[Pe66  
{ SXao|{?O  
 BOOL bProcessed=FALSE; 2_Wg!bq  
 if(HC_ACTION==nCode) ;['[?wk  
 { kNu'AT#3|  
  if((lParam&0xc0000000)==0xc0000000){// Key up q1E:l!2al  
   switch(wParam) yr#5k`&\_  
   { OMwsbp&  
    case VK_MENU: %4 \OPw&  
     MaskBits&=~ALTBIT; _C\[DR0n  
     break; y~IuPc  
    case VK_CONTROL: 9Lh|DK,nV/  
     MaskBits&=~CTRLBIT; *m%]zj0bo  
     break; K78rg/`  
    case VK_SHIFT: Jc)^49Rf  
     MaskBits&=~SHIFTBIT; 6<0n *&  
     break; L6>pGx  
    default: //judge the key and send message 6Es? MW=  
     break; _Lw OOZj  
   } eMRar<)+#*  
   for(int index=0;index<MAX_KEY;index++){ smG>sEp2  
    if(hCallWnd[index]==NULL) [sW.CK= 3  
     continue; bqanFQj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \D>$aLO*?  
    { RtG}h[k/X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); iR$<$P5  
     bProcessed=TRUE; >:=|L%]s;\  
    } K/ &?VIi`z  
   } Wl h~)   
  } @pGZLq  
  else if((lParam&0xc000ffff)==1){ //Key down ylKmj]A  
   switch(wParam) Y32O-I!9u  
   { o;b0m;~   
    case VK_MENU: I8OD$`~*U6  
     MaskBits|=ALTBIT; ?j^=u:<  
     break; &h*S y  
    case VK_CONTROL: k%[3Q>5iM  
     MaskBits|=CTRLBIT;  ]*O/+  
     break; m8623D B"  
    case VK_SHIFT: tweY'x.{  
     MaskBits|=SHIFTBIT; 6io, uh!  
     break; C8a*Q"  
    default: //judge the key and send message 39 {{7(hh  
     break; cNzt%MjP  
   } wOB azWa   
   for(int index=0;index<MAX_KEY;index++) Cw5%\K$=  
   { o`khz{SU:  
    if(hCallWnd[index]==NULL) hVj NZ  
     continue; y80ykGPT\&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y{q*s8NY  
    { zU6a't P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j QU"Ved  
     bProcessed=TRUE; K!D o8|  
    } yV)m"j  
   } K; FW  
  } <lr*ZSNY  
  if(!bProcessed){ 93[DAs  
   for(int index=0;index<MAX_KEY;index++){ RkF D*E$  
    if(hCallWnd[index]==NULL) u6:pV.p  
     continue; =O|c-k,f@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j?b\+rr  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `"vZ);i <  
   } pIW I  
  } Es5  
 } KC e13!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |L_wX:d`9  
} uGdp@]z&8Q  
2?Ye*-  
BOOL InitHotkey() l0*Gb  
{ %}2@rLP  
 if(hHook!=NULL){ ;0ME+]`"3  
  nHookCount++; DaNW~rd{  
  return TRUE; v;{{ y-  
 } /R X1UQ.s  
 else {#IPf0O  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ashcvn~z  
  if(hHook!=NULL) 2EQ 6J  
   nHookCount++; A`O<6   
  return (hHook!=NULL);  Do?P<x o  
}  Z:2I/  
BOOL UnInit() j:5%ppIY  
{ 4X NxI1w)  
 if(nHookCount>1){ QGiAW7b5  
  nHookCount--; HOt>}x  
  return TRUE; O`FqD{@V  
 } ;??ohA"{5  
 BOOL unhooked = UnhookWindowsHookEx(hHook); L{ gE'jCC  
 if(unhooked==TRUE){ B1N)9%  
  nHookCount=0; %R_{1GrL'c  
  hHook=NULL; $awi>#[  
 } H;<!TX.zD  
 return unhooked; ^Cz YDq  
} _17|U K|N  
~WVO  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S_J :&9L  
{ )J/HkOj"V  
 BOOL bAdded=FALSE; mXjgs8 s  
 for(int index=0;index<MAX_KEY;index++){ <*'cf2Q$Av  
  if(hCallWnd[index]==0){ bv?0.{Z  
   hCallWnd[index]=hWnd; LR)& [{Kk  
   HotKey[index]=cKey; Y{Ap80'\6  
   HotKeyMask[index]=cMask; 2x$x; \*j  
   bAdded=TRUE; .I?@o8'x  
   KeyCount++; U+]Jw\\l  
   break; 5#:pT  
  } P1 +"v*  
 } <2Y0{ 8)  
 return bAdded; _[Gb)/@mM  
} -@%%*YI>  
34C``i  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :jNYP{Br  
{ fhpX/WE6  
 BOOL bRemoved=FALSE; $B\E.ml.  
 for(int index=0;index<MAX_KEY;index++){ $7gB_o$zz  
  if(hCallWnd[index]==hWnd){ K\=8eg93Z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G^h_ YjR`*  
    hCallWnd[index]=NULL; Rmh*TQu  
    HotKey[index]=0; 2PC5^Ni/9@  
    HotKeyMask[index]=0; `bgb*Yaod  
    bRemoved=TRUE;  .Oo/y0E^  
    KeyCount--; n`5WXpz4;  
    break; w$Ux?y- L  
   } _'iDF  
  } #qL9{P<}  
 } AqYxWk3>  
 return bRemoved; )5l u.R%  
} XCPb9<L  
+t\^(SJ6  
void VerifyWindow() ?vbDB4  
{ u^Sv#K X  
 for(int i=0;i<MAX_KEY;i++){ qe?Ggz3p.  
  if(hCallWnd!=NULL){ Lt<oi8'N  
   if(!IsWindow(hCallWnd)){ OXtBJYe  
    hCallWnd=NULL; PZ]5Hf1"  
    HotKey=0; ?MZ:_'2p  
    HotKeyMask=0; Cg6;I.K   
    KeyCount--; FN{/.?w(  
   } ya>N.h  
  } "Pdvmur  
 } EVz9WY  
} x70N8TQ_gK  
{visv{R<  
BOOL CHookApp::InitInstance() MSB%{7'o  
{ i7v/A&Rc  
 AFX_MANAGE_STATE(AfxGetStaticModuleState());  GVp  
 hins=AfxGetInstanceHandle(); Vu|dV\N0*  
 InitHotkey(); `1,eX)S  
 return CWinApp::InitInstance(); )+B=z}:Nfz  
} |0w~P s  
Q<'@V@H  
int CHookApp::ExitInstance() ;GQm[W([  
{ ?'LM7RE$X6  
 VerifyWindow(); =tq7z =k  
 UnInit(); f(.6|mPp  
 return CWinApp::ExitInstance(); :|($,3*  
} Jk~UEqr+  
,lP7 ri  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Ys+N,:#R  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Ns~ g+C9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |0DP} `~  
#if _MSC_VER > 1000 ]-rczl|o  
#pragma once g5<ZS3tQ  
#endif // _MSC_VER > 1000 Ei~]iZ}  
5F03y`@ u  
class CCaptureDlg : public CDialog xOgq-@`  
{ ])68wqD  
 // Construction }{#7Z8   
 public: XWf7"]%SX  
  BOOL bTray; QS%,7'EG  
  BOOL bRegistered; 5 2fO)!  
  BOOL RegisterHotkey(); $uTlbAuv  
  UCHAR cKey; B~4mk  
  UCHAR cMask; dc)wu]  
  void DeleteIcon(); (A|B@a!Y>  
  void AddIcon(); mR6E]TuM  
  UINT nCount; 2}>go^#O/w  
  void SaveBmp(); y#nSk% "t"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor y8}"DfU.  
  // Dialog Data 'H FwP\HX  
  //{{AFX_DATA(CCaptureDlg) %!D_q ~"H  
  enum { IDD = IDD_CAPTURE_DIALOG }; a\Tr!Be,  
  CComboBox m_Key; Jn60i6/  
  BOOL m_bControl; AwA1&mh  
  BOOL m_bAlt; e$x4Ux7*"  
  BOOL m_bShift; @ > cdHv  
  CString m_Path; ./2Z?,  
  CString m_Number; XZ!cW=bqS  
  //}}AFX_DATA c-v*4b/d  
  // ClassWizard generated virtual function overrides }q/(D?  
  //{{AFX_VIRTUAL(CCaptureDlg) 7d%A1}Bq$  
 public: <b3x(/  
  virtual BOOL PreTranslateMessage(MSG* pMsg); tc!!W9{69  
 protected: Cd$dn HVh  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .59KE]u  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4;",@}  
  //}}AFX_VIRTUAL _95- -\  
  // Implementation HIQ]"Hl  
 protected: \=$EmHF  
  HICON m_hIcon; t@l(xnsV  
  // Generated message map functions QZ6[*_Z6  
  //{{AFX_MSG(CCaptureDlg) +.XZK3  
  virtual BOOL OnInitDialog(); ,s\x]bh  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ab8oMi`z  
  afx_msg void OnPaint(); (9Fabo\SH  
  afx_msg HCURSOR OnQueryDragIcon(); |Gf1^8:C9  
  virtual void OnCancel(); "``W6W-(  
  afx_msg void OnAbout(); TW'E99wG  
  afx_msg void OnBrowse(); />2A<{6\=P  
  afx_msg void OnChange(); bS_y_ 9K  
 //}}AFX_MSG |) x'  
 DECLARE_MESSAGE_MAP() s ZlJ/_g  
}; V=G b>_d  
#endif  PU,6h}  
,eZ;8W{G  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file V)_H E  
#include "stdafx.h" c+}!yH$  
#include "Capture.h" UrD=|-r`  
#include "CaptureDlg.h" 8@9hU`H8l  
#include <windowsx.h> 6R$ F =MB  
#pragma comment(lib,"hook.lib") Y&K<{ KA\4  
#ifdef _DEBUG *u:;:W&5y  
#define new DEBUG_NEW ;:#?~%7>  
#undef THIS_FILE oi33{#%t  
static char THIS_FILE[] = __FILE__; ^&f{beU9  
#endif *qeic e%E  
#define IDM_SHELL WM_USER+1 bIvJs9L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uzzWZ9Tv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yv6Zo0s<J  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Q#yu(  
class CAboutDlg : public CDialog }1X11+/W  
{ Wto@u4  
 public: 4?P%M"\Iv  
  CAboutDlg(); Fi?U)T+%+  
  // Dialog Data lp37irI:  
  //{{AFX_DATA(CAboutDlg) JLFFh!J  
  enum { IDD = IDD_ABOUTBOX }; J};u25:}  
  //}}AFX_DATA +l[Z2mW  
  // ClassWizard generated virtual function overrides 4U LJtM3  
  //{{AFX_VIRTUAL(CAboutDlg) Z=e[ !c  
 protected: ;*<{*6;=?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support EyKkjEXx_  
  //}}AFX_VIRTUAL hB2s$QS  
  // Implementation LP0;n\  
 protected: a`[?,W:q  
  //{{AFX_MSG(CAboutDlg) 36x5q 1  
  //}}AFX_MSG A|`Joxr  
  DECLARE_MESSAGE_MAP() c1)BGy li  
}; .Y^d9.  
)$lSG}WD  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) _4XoUE\\  
{ 3;t@KuQ66  
 //{{AFX_DATA_INIT(CAboutDlg) c*M)DO`y;h  
 //}}AFX_DATA_INIT ]$?zT`>(F  
} 0%q ctZy  
j"D0nG,  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) YN5OuKMUd'  
{ "I}'C^gP  
 CDialog::DoDataExchange(pDX); 6>LQGO  
 //{{AFX_DATA_MAP(CAboutDlg) *'`3]!A  
 //}}AFX_DATA_MAP 5w,YBUp  
} =A6u=  
/RXk[m-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) RB$ 8^#  
 //{{AFX_MSG_MAP(CAboutDlg) 'wT./&Z  
 // No message handlers LfjS[  
 //}}AFX_MSG_MAP $S)e"Po~5  
END_MESSAGE_MAP() ^$&"<  
v#<+n{B  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) MSYLkQ}_b  
: CDialog(CCaptureDlg::IDD, pParent) eqUn8<<s  
{ 0-&s J  
 //{{AFX_DATA_INIT(CCaptureDlg) 5Ky9Pz  
  m_bControl = FALSE; e G*s1uQl  
  m_bAlt = FALSE; EDa08+Y  
  m_bShift = FALSE; U7f&N  
  m_Path = _T("c:\\"); NkjQyMF  
  m_Number = _T("0 picture captured."); No92Y^~/  
  nCount=0; OL mBh3&  
  bRegistered=FALSE; ;hfG$ {l;  
  bTray=FALSE; )*$  
 //}}AFX_DATA_INIT ~A:;?A'.  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 b$`4Nn|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); <+i`W7  
} %f3Nml  
E{k%d39>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) L[[H&#\  
{ ETH#IM8J  
 CDialog::DoDataExchange(pDX); sJYKt   
 //{{AFX_DATA_MAP(CCaptureDlg) 0or6_ y6  
  DDX_Control(pDX, IDC_KEY, m_Key);  h?pGw1Q  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); D^R! |K/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ;uWI l  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); V@+<,tjq  
  DDX_Text(pDX, IDC_PATH, m_Path); \<MTY:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Z5^,!6  
 //}}AFX_DATA_MAP )mo|.L0  
} @}rfY9o'  
8-g$HXqs_#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G}hkr  
//{{AFX_MSG_MAP(CCaptureDlg) },QFyT  
 ON_WM_SYSCOMMAND() 4#Nd;gM2  
 ON_WM_PAINT() $}h_EI6hS  
 ON_WM_QUERYDRAGICON() Hd@T8 D*A  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) k3|9U'r!c  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) XuAc3~HAd  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ABYW1K=  
//}}AFX_MSG_MAP kU9AfAe  
END_MESSAGE_MAP() {~p %\  
&)'kX  
BOOL CCaptureDlg::OnInitDialog() j~j V`>A  
{ GMp'KEQQ  
 CDialog::OnInitDialog(); d5W[A#}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); PT*@#:MA  
 ASSERT(IDM_ABOUTBOX < 0xF000); 9lwo/(s  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^J=txsx  
 if (pSysMenu != NULL) WAXrA$:3J  
 { [z t&8g  
  CString strAboutMenu; 9Qm{\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); I3=Sc^zz&V  
  if (!strAboutMenu.IsEmpty()) Vh-h{  
  { ea;c\84_N  
   pSysMenu->AppendMenu(MF_SEPARATOR); O#Ax P}  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); mp$II?hZ*  
  } |8?{JKsg  
 } g<jK^\e W  
 SetIcon(m_hIcon, TRUE); // Set big icon w5G34[v  
 SetIcon(m_hIcon, FALSE); // Set small icon "Q!{8 9Y  
 m_Key.SetCurSel(0); Iz=E8R g  
 RegisterHotkey(); j{+I~|ZB,  
 CMenu* pMenu=GetSystemMenu(FALSE); Z`h_oK#y15  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6B P%&RL  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .TU15AAc  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5N}|VGN  
 return TRUE; // return TRUE unless you set the focus to a control |"&4"nwa  
} N9hWx()v  
<}>-ip?  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) S^_yiV S  
{ fH{$LjH(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) NY w(hAPv  
 { d`*vJ#$> 2  
  CAboutDlg dlgAbout; _'v )Fy  
  dlgAbout.DoModal();  C3Z(k}  
 } SQCuY<mD  
 else nr%^:u  
 { vx,6::%]  
  CDialog::OnSysCommand(nID, lParam); TV2:5@33  
 } C'"6@-~  
} Yhdt8[ 2  
D'=`O6pK  
void CCaptureDlg::OnPaint() 2Nszxvq,  
{ _dY}86{  
 if (IsIconic()) XX+rf  
 { +DDvM;31w  
  CPaintDC dc(this); // device context for painting S!c@6&XJm?  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); cA^7}}?e  
  // Center icon in client rectangle $a]dxRkz  
  int cxIcon = GetSystemMetrics(SM_CXICON); \%*y+I0>  
  int cyIcon = GetSystemMetrics(SM_CYICON); T{Q&}`D)r  
  CRect rect; V)@scB|>,  
  GetClientRect(&rect); ]5L3[A4Vu  
  int x = (rect.Width() - cxIcon + 1) / 2; :"^$7  
  int y = (rect.Height() - cyIcon + 1) / 2; Np)!23 "  
  // Draw the icon 0<;B2ce  
  dc.DrawIcon(x, y, m_hIcon); l#:Q V:  
 } 3Pq)RD|hn  
 else Ku# _   
 { L*38T\  
  CDialog::OnPaint(); my0->W%L  
 } 1Sr}2@>  
} ]].21  
suSIz 7:  
HCURSOR CCaptureDlg::OnQueryDragIcon() Ved:w^ ,  
{ z AIC5fvu  
 return (HCURSOR) m_hIcon; sa ?;D  
} &0TheY;srf  
AEJm/8,T  
void CCaptureDlg::OnCancel() 4]R3*F  
{  glUP  
 if(bTray) .})8gL7 V  
  DeleteIcon(); t$2{U  
  CDialog::OnCancel(); R&p53n  
} XDQ1gg`  
YKk%;U*  
void CCaptureDlg::OnAbout() _XtY/7n  
{ <k1gc,*  
 CAboutDlg dlg; W525:h52{  
 dlg.DoModal(); Wov_jVdN\  
} +d96Z^KUhv  
cm<3'#~Q?  
void CCaptureDlg::OnBrowse() b"V-!.02  
{ m9S5;kB]  
 CString str; gS 3&,^  
 BROWSEINFO bi; 8a {gEZT,  
 char name[MAX_PATH]; 6P8X)3CE<T  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); +aap/sYp  
 bi.hwndOwner=GetSafeHwnd(); MJoC*8QxM  
 bi.pszDisplayName=name; zrM|8Cu  
 bi.lpszTitle="Select folder"; YVi]f2F%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4a~_hkY]  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); :csLZqn[  
 if(idl==NULL) {s]eXc]K}  
  return; gB#t"s)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); jLg4_N1SD  
 str.ReleaseBuffer(); G.8ZISN/  
 m_Path=str; W:G*t4i  
 if(str.GetAt(str.GetLength()-1)!='\\') Wj0([n  
  m_Path+="\\"; X-)6.[9f  
 UpdateData(FALSE); |BR&p)7)  
} xe' *%3-v)  
[LK 9^/V  
void CCaptureDlg::SaveBmp() 191)JWfa  
{ .'M]cN~  
 CDC dc; a>6p])Wh  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); \uH;ng|m  
 CBitmap bm; Rh|&{Tf  
 int Width=GetSystemMetrics(SM_CXSCREEN); e"Z~%,^A  
 int Height=GetSystemMetrics(SM_CYSCREEN); T^ -RP  
 bm.CreateCompatibleBitmap(&dc,Width,Height); x.I-z@\E  
 CDC tdc; cD]t%`*  
 tdc.CreateCompatibleDC(&dc); P=.W.oS  
 CBitmap*pOld=tdc.SelectObject(&bm); Pt$7U[N  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); hO8B]4=&*  
 tdc.SelectObject(pOld); a,.9eHf  
 BITMAP btm; y)2]:nD`B  
 bm.GetBitmap(&btm); 9j/B3CjW  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Fa8>+  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); EW)]75o{QF  
 BITMAPINFOHEADER bih; LdcP0G\"VG  
 bih.biBitCount=btm.bmBitsPixel; ,fbO}  
 bih.biClrImportant=0; xYbF76B  
 bih.biClrUsed=0; /@K?W=w4  
 bih.biCompression=0; rz(DZV  
 bih.biHeight=btm.bmHeight; 2B|3`trY4x  
 bih.biPlanes=1; RAvV[QkT  
 bih.biSize=sizeof(BITMAPINFOHEADER); lxbZM9A2  
 bih.biSizeImage=size; MEE]6nU  
 bih.biWidth=btm.bmWidth; oPi)#|jcb  
 bih.biXPelsPerMeter=0; <5 okwcJ^  
 bih.biYPelsPerMeter=0; "qF8'58  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5}f$O  
 static int filecount=0; 1cPi>?R:  
 CString name; ) E5ax~  
 name.Format("pict%04d.bmp",filecount++); )s M}BY  
 name=m_Path+name; jd#{66:  
 BITMAPFILEHEADER bfh; iC 2:P~  
 bfh.bfReserved1=bfh.bfReserved2=0; 3.soCyxmc  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %gN8-~$ 1  
 bfh.bfSize=54+size; R6ywc "xE  
 bfh.bfOffBits=54; sD M!Uv2n  
 CFile bf; '8Yx  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ tUzuel*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); MYu-[Hg  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^#;2 Pd>  
  bf.WriteHuge(lpData,size); 8YCtU9D  
  bf.Close(); !5pp A  
  nCount++; /#blXI  
 } rLp0VKPe  
 GlobalFreePtr(lpData); 7p|Pv;wp|  
 if(nCount==1) )V3G~p=0  
  m_Number.Format("%d picture captured.",nCount); h.PY$W<  
 else )x]/b=m  
  m_Number.Format("%d pictures captured.",nCount); {jbOcx$t  
  UpdateData(FALSE);  </7J:#  
} U4%P0}q/  
F&Q:1`y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ! @|"84  
{ N"T+. r  
 if(pMsg -> message == WM_KEYDOWN) 8g$pfHt|e  
 { r"^P>8  
  if(pMsg -> wParam == VK_ESCAPE) ktnsq&qNL  
   return TRUE; s %/3X\_  
  if(pMsg -> wParam == VK_RETURN) "H6DiPh.E  
   return TRUE; L\!Pa+Iod  
 } 5s8k^n"A  
 return CDialog::PreTranslateMessage(pMsg); 0D=6-P?^W  
} *&!&Y*Jzg  
 T=9+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t '* L,  
{ tK1P7pbC8r  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ;=aj)lemCr  
  SaveBmp(); </Ja@%  
  return FALSE; <$R'y6U :  
} =56O-l7T*w  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ \K55|3~R  
 CMenu pop; L `3x0u2  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >,7 -cm=.  
 CMenu*pMenu=pop.GetSubMenu(0); PIl:z?q({  
 pMenu->SetDefaultItem(ID_EXITICON); G,3.'S,7  
 CPoint pt; s&TPG0W  
 GetCursorPos(&pt); XC%u`UG  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CN+[|Mz*p  
 if(id==ID_EXITICON) 3P N<J  
  DeleteIcon(); /{|JQ'gqX  
 else if(id==ID_EXIT) tP^2NTs%]  
  OnCancel(); <>%2HRn<u  
 return FALSE; rUmaKh?v|X  
} K+p7yZJ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xim'TVwvC  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5LMAy"  
 AddIcon(); N"L@  
 return res; "V'<dn  
} gw O]U=Y  
,%6!8vX  
void CCaptureDlg::AddIcon() %OE (?~dq  
{ K+|G9  
 NOTIFYICONDATA data; !-B$WAV  
 data.cbSize=sizeof(NOTIFYICONDATA); pV[SY6/  
 CString tip; C( wZj O?N  
 tip.LoadString(IDS_ICONTIP); t[}&*2"$/  
 data.hIcon=GetIcon(0); &Zy%Zz  
 data.hWnd=GetSafeHwnd(); mH6\8I  
 strcpy(data.szTip,tip); Z@(m.&ZRx  
 data.uCallbackMessage=IDM_SHELL; q[}W&t,  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .:r l<.  
 data.uID=98; a1#",%{I  
 Shell_NotifyIcon(NIM_ADD,&data); @5}(Y( @  
 ShowWindow(SW_HIDE); \&BT#8ELG  
 bTray=TRUE; BMi5F?Q'G  
} ? R!Pf: t  
++\s0A(e  
void CCaptureDlg::DeleteIcon() 1EiSxf  
{  hik.c3  
 NOTIFYICONDATA data; )kIZm Q|f1  
 data.cbSize=sizeof(NOTIFYICONDATA); kltorlH  
 data.hWnd=GetSafeHwnd(); z#HNJAQ#|  
 data.uID=98; T|k_$LH  
 Shell_NotifyIcon(NIM_DELETE,&data); >lkjoEVQ  
 ShowWindow(SW_SHOW); PjE%_M<  
 SetForegroundWindow(); # KUN ZW  
 ShowWindow(SW_SHOWNORMAL); rczwxWK  
 bTray=FALSE; lK Ry4~O  
} d~qZ;uw  
#sm@|'Q%  
void CCaptureDlg::OnChange() ,8[R0wsBaz  
{ B,b^_4XX$  
 RegisterHotkey(); U_sM==~  
} ^]k=*>{ R  
TUN6`/"  
BOOL CCaptureDlg::RegisterHotkey() @HQqHO&N  
{ m^$KDrkD  
 UpdateData(); ^XT;n  
 UCHAR mask=0; Z6fR2A~Q[  
 UCHAR key=0; B-p ].  
 if(m_bControl) 3[UaK`/1C  
  mask|=4; \*mKctpz]6  
 if(m_bAlt) RveEA/&&  
  mask|=2; wBCBZs$H  
 if(m_bShift) ?$@E}t8g\  
  mask|=1; ^!6T,7 B B  
  key=Key_Table[m_Key.GetCurSel()]; Wgm{ ]9Q  
 if(bRegistered){ x-T7 tr&(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !-Uq#Ea0/  
  bRegistered=FALSE; b"(bT6XO!  
 } Ssd7]G+n:  
 cMask=mask; PNpH)'C|  
 cKey=key; ._p^0UxT  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); v*&WqVg  
 return bRegistered; X\|h:ce  
} YK V"bI  
P EMuIYm$  
  四、小结 F\%PB p  
Bgs,6:  
  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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