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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: Mq76]I%  
  _IC,9bbg  
  一、实现方法 v;Swo("  
L#`7FaM?  
  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: ZU)BJ!L,s  
//~POm  
#pragma data_seg("shareddata") ?_8%h`z  
HHOOK hHook =NULL; //钩子句柄 {3.*7gnY\L  
UINT nHookCount =0; //挂接的程序数目 (rAiDRQ[  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 a5X`jo  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 7Nd*,DV_  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey T=^jCH &  
static int KeyCount =0; FPvuzBJ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 (%6(5,   
#pragma data_seg() hx*HY%\P  
-QN1oK@\mE  
  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。 BXNI(7xi  
FwXKRZa  
  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: T!Xm")d  
1]_?$)$T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,tcP=f dk]  
cKey,UCHAR cMask) 7WgIhQ~  
{ n?zbUA#  
 BOOL bAdded=FALSE; $Z,i|K;  
 for(int index=0;index<MAX_KEY;index++){ 3fm;r5  
  if(hCallWnd[index]==0){ '`9%'f)  
   hCallWnd[index]=hWnd; 3%_ 4+zd  
   HotKey[index]=cKey; ~g*Y, Y  
   HotKeyMask[index]=cMask; @bc[ eas  
   bAdded=TRUE; >_&~!Y.Z=  
   KeyCount++; O~${&(  
   break; P/C&R-{')  
  } S&5Q~}{,  
 } d&NCFx  
 return bAdded; /&*m1EN#o  
} i/5y^  
//删除热键 g@<sU0B  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ub[""M?  
{ <\E"clZI  
 BOOL bRemoved=FALSE; j|&{e91,?  
 for(int index=0;index<MAX_KEY;index++){ o G (0i  
  if(hCallWnd[index]==hWnd){ f<g>dQlE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ NS7@8 #C  
    hCallWnd[index]=NULL; , D exJ1  
    HotKey[index]=0; cSY2#u|v  
    HotKeyMask[index]=0; X!,#'&p&  
    bRemoved=TRUE; [B}1z  
    KeyCount--; )`B -O::  
    break; 0|.7Kz^  
   } 8T8pAs0 p  
  } I++W0wa.n  
 } xIS\4]F?r  
 return bRemoved; ,:v.L}+Z  
} &?KPu?9  
4C l, Iw/;  
o}WB(WsG  
  DLL中的钩子函数如下: JVD@I{  
9=Y,["br$_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zWF 5m )-  
{ [54@irH  
 BOOL bProcessed=FALSE; IW5*9)N?  
 if(HC_ACTION==nCode) A6{t%k~F  
 { Xy[4f=X}z  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {D;Xa`:O  
   switch(wParam) Rf)'HT  
   {  ML=hKwCA  
    case VK_MENU: 9 eSN+q  
     MaskBits&=~ALTBIT; t7{L[C$  
     break; RnMBGxa  
    case VK_CONTROL: @m+pr\h(  
     MaskBits&=~CTRLBIT; GCcwEl!K^  
     break;  6'RZ  
    case VK_SHIFT: Z-N-9E  
     MaskBits&=~SHIFTBIT; $w|o@ Ml)  
     break; :SpG&\+  
    default: //judge the key and send message 0MwG}|RC  
     break; *4(/t$)pEl  
   } ^/_\etV  
   for(int index=0;index<MAX_KEY;index++){ z1Bj_u{  
    if(hCallWnd[index]==NULL) LL|_c4$Ky  
     continue; 4q\.I +r^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qWRNHUd  
    { %00k1 *$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); - XE79 fQ  
     bProcessed=TRUE; L LYHr  
    } i1b4 J  
   } E[)7tr  
  } ](B& l{V  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?;0nJf  
   switch(wParam) Nb^zkg  
   { h]J&A  
    case VK_MENU: O ,Pl7x%tK  
     MaskBits|=ALTBIT; GN htnB  
     break; rK(x4]I l"  
    case VK_CONTROL:  At`1)  
     MaskBits|=CTRLBIT; ?=;e.qK=71  
     break; s=^r/Sz902  
    case VK_SHIFT: |QAeQWP+1  
     MaskBits|=SHIFTBIT; ,z?<7F1q=  
     break; 2a._?(k_y  
    default: //judge the key and send message }S~ysQwT  
     break; \3n{w   
   } }@ O|RkY  
   for(int index=0;index<MAX_KEY;index++){ /(hP7_]`2  
    if(hCallWnd[index]==NULL) b'Fx),  
     continue; (ybtXoQs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) br34Eh  
    { O?C-nw6kP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <FUqD0sQ  
     bProcessed=TRUE; |xsV(jK8  
    } AiyvHt  
   } f>\bUmk(  
  } Z]7;u>2  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \U)2 Tg  
   for(int index=0;index<MAX_KEY;index++){ @yU!sE:  
    if(hCallWnd[index]==NULL) h}anTFKP  
     continue; GvZac  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) RvyBg:Aj5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); l6&v}M  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ie^Dn!0S  
   } W%cj39$  
  } p:[`%<j0  
 } g:.,}L  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *O(/UVuD\  
} | Q1ub S  
ecY ^C3+S  
  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: @n~>j&Kp  
4i[v ew  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .gM>FUH3L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9%3 r-U=  
-CU7u=*b  
  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: dVsAX(  
I |<+'G  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /c_kj2& ]9  
{ XvA0nEi  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &{%S0\K Y  
 { `L"p)5H  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ga{25q}"  
  SaveBmp(); :]u}x Dv3  
  return FALSE; Ry8WNVO}R  
 } d}wa[WRv   
 …… //其它处理及默认处理 =& Tu`m  
} 6uCk0 B|  
BqLtTo?'  
r'9=k x  
  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。 o/  x5  
wQdW lon  
  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。 !ulLGmUn  
5|6z1{g8  
  二、编程步骤 ."!8B9 s  
VJ6>3  
  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"; '&pf  
:bM$;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; &-8-xw#.  
~P]HG;$?n  
  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; -h G 9  
F)E7(Un`8  
  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; 0'q(XB`i=  
H%01&u  
  5、 添加代码,编译运行程序。 SVg@xu+  
_ntW}})K  
三、程序代码 I(?|Ox9"?  
ziLr }/tg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL bn*{*=(|  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 8)-t91hkL  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (1elF)  
#if _MSC_VER > 1000 XY+aunLf  
#pragma once /4"S}P>f  
#endif // _MSC_VER > 1000 uZ0 $s$  
#ifndef __AFXWIN_H__ =qS^Wz.  
#error include 'stdafx.h' before including this file for PCH Ltic_cjYd?  
#endif 0IPhVG~#  
#include "resource.h" // main symbols H%NLL4&wu  
class CHookApp : public CWinApp G7_"^r%c9;  
{ 7>2j=Y_Kp  
 public: {Jw<<<G  
  CHookApp(); u6qi  
  // Overrides zFdz]z3  
  // ClassWizard generated virtual function overrides 5>1Y="B  
  //{{AFX_VIRTUAL(CHookApp) Y8`))MeD  
 public: SbPjU5 0  
  virtual BOOL InitInstance(); QnP?;  
  virtual int ExitInstance(); o wpJ7S1~  
  //}}AFX_VIRTUAL |{ /O)3  
  //{{AFX_MSG(CHookApp) wh7a|  
  // NOTE - the ClassWizard will add and remove member functions here. ^pQ;0[9Y0  
  // DO NOT EDIT what you see in these blocks of generated code ! vn%U;}  
  //}}AFX_MSG &W!d}, ;  
  DECLARE_MESSAGE_MAP() C(t6;&H  
}; ^d5./M8Bd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 7]. IT(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3 ?|; on  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <0Egkz3s  
BOOL InitHotkey(); aji~brq  
BOOL UnInit(); : 7DVc&0  
#endif SVs~,  
xwH|ryfs,Z  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 6dS1\Y  
#include "stdafx.h" Znh uIA AG  
#include "hook.h" KEVy%AP=*h  
#include <windowsx.h> <C.$Db&9  
#ifdef _DEBUG F{H0 %  
#define new DEBUG_NEW -< dMD_  
#undef THIS_FILE ETWmeMN  
static char THIS_FILE[] = __FILE__; |v %RjN  
#endif ! ^*;c#  
#define MAX_KEY 100 #L4Kwy  
#define CTRLBIT 0x04 !,JT91  
#define ALTBIT 0x02 k89gJ5B$  
#define SHIFTBIT 0x01 Ye=7Y57Nr  
#pragma data_seg("shareddata") KlqJ EtO_  
HHOOK hHook =NULL; /qhm9~4e3  
UINT nHookCount =0; (Q]Y> '  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %qjyk=z+Z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 9Or4`JOO  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey %:;[M|.  
static int KeyCount =0; gS<{ekN  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }Ka.bZS  
#pragma data_seg() I^\bS  
HINSTANCE hins; NF\^'W@N  
void VerifyWindow(); pQMpkAX  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [U7,\o4w  
//{{AFX_MSG_MAP(CHookApp) &{4Mo,x  
// NOTE - the ClassWizard will add and remove mapping macros here. er7/BE&  
// DO NOT EDIT what you see in these blocks of generated code! }!7DF  
//}}AFX_MSG_MAP *(q8?x0>  
END_MESSAGE_MAP() H- qP>:  
a~eLkWnh<k  
CHookApp::CHookApp() K84cE  
{ )E~\H+FP6  
 // TODO: add construction code here, )%@WoBRj  
 // Place all significant initialization in InitInstance nIKT w  
} +xdFkc  
,, #rv-*  
CHookApp theApp; `::'UfHc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) YM.IRj2/1  
{ /R$x-7t)^(  
 BOOL bProcessed=FALSE; sS2E8Z2  
 if(HC_ACTION==nCode) "KE38`NL  
 { TN@JPoH  
  if((lParam&0xc0000000)==0xc0000000){// Key up +-YuBVHL  
   switch(wParam) T&MS_E&;  
   { M*@ aA XM  
    case VK_MENU: H{Y=&#%d  
     MaskBits&=~ALTBIT; rbZ6V :  
     break; OO+#KyU   
    case VK_CONTROL: /?-p^6U  
     MaskBits&=~CTRLBIT; Wu;|(2I  
     break; |afK"N  
    case VK_SHIFT: J8?6G&0H  
     MaskBits&=~SHIFTBIT; 'xXqEwi4  
     break; w |FV qX  
    default: //judge the key and send message QOy&!6  
     break; z.Kq}r^  
   } wp GnS  
   for(int index=0;index<MAX_KEY;index++){ Rf0\CEc  
    if(hCallWnd[index]==NULL) DMZ aMY|  
     continue; n*4X/K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;)pV[3[  
    { 4bi\$   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); } 9s  
     bProcessed=TRUE; i\4"FO?v  
    } ^Ro du  
   } -R \ @W q@  
  } A;`U{7IST  
  else if((lParam&0xc000ffff)==1){ //Key down \HEo8~TY  
   switch(wParam) Y[]+C8"O  
   { HV7(6VSJ+  
    case VK_MENU: :#htOsP  
     MaskBits|=ALTBIT; zjh9ZLu[  
     break; L[r0UXYLV  
    case VK_CONTROL: 7b%Cl   
     MaskBits|=CTRLBIT; 0HuRFl  
     break; A.x}%v,E  
    case VK_SHIFT: ^?xJpr%)  
     MaskBits|=SHIFTBIT; ZBq*<VtV  
     break; s1$#G!'  
    default: //judge the key and send message Cj9O [  
     break; iT9Ex9RL  
   } (Tb0PzA  
   for(int index=0;index<MAX_KEY;index++) |ylTy B  
   { B(Q.a&w45t  
    if(hCallWnd[index]==NULL) {u6fa>R&$  
     continue; 6|qvo+%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y4!q 1]TGX  
    { `'.x*MNF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); gH55c aF<  
     bProcessed=TRUE; TZyQOjUu  
    } XJ/ kB8  
   } FS+^r\)  
  } SWd[iD  
  if(!bProcessed){ @M?EgVmW  
   for(int index=0;index<MAX_KEY;index++){ D % ,yA  
    if(hCallWnd[index]==NULL) &B0&183  
     continue; oYErG] ,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }lpm Hvs  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D\*_ulc]  
   } >Io7h#[u  
  } xxcDd_z  
 } QF "&~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #LgoKiP!Y  
} FtDA k?  
}v ,P3  
BOOL InitHotkey() j6(IF5MqP  
{ 0$ac1;7  
 if(hHook!=NULL){ Qf(e'e  
  nHookCount++;  AlaN;  
  return TRUE; JP*mQzZL  
 } Xb]?/7 X  
 else { (,vm}iFL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); dk`!UtNNRa  
  if(hHook!=NULL) j|dzd<kE6  
   nHookCount++; IqKXFORiNI  
  return (hHook!=NULL); pv SFp-:_  
} o`! :Q!+  
BOOL UnInit() Fe< t@W  
{ JlGD.!`  
 if(nHookCount>1){ 7]zZh a4X  
  nHookCount--; rL3Vogw'e  
  return TRUE; (gB=!1/|G  
 } bx e97]  
 BOOL unhooked = UnhookWindowsHookEx(hHook); K -1~K  
 if(unhooked==TRUE){ \ySc uT  
  nHookCount=0;   NX_S  
  hHook=NULL; d'fpaLV  
 } (k.7q~:  
 return unhooked; e-=PT 1T`  
} 4!%LD(jB`B  
Y!$ z7K  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oHnpwU  
{ () ;7+  
 BOOL bAdded=FALSE; gdNp2b  
 for(int index=0;index<MAX_KEY;index++){ Gn4b\y%%  
  if(hCallWnd[index]==0){ $_5v^QL  
   hCallWnd[index]=hWnd; 4aKy]zPoE  
   HotKey[index]=cKey; ZM`_P!G  
   HotKeyMask[index]=cMask; <qt%MM [Y  
   bAdded=TRUE; )pa|uH +N  
   KeyCount++; 1*b%C"C  
   break; 1M+!cX  
  } (1]@ fCd +  
 } @Qozud\?  
 return bAdded; C,u.!g;lm  
} C YKGf1;If  
Y2&6xTh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B*N8:u  
{ lf# six  
 BOOL bRemoved=FALSE; ]+9:i!s  
 for(int index=0;index<MAX_KEY;index++){ U5 "v1"Ec  
  if(hCallWnd[index]==hWnd){ W<7Bq_L[|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ YU(x!<Z  
    hCallWnd[index]=NULL; qrYeh`Mv  
    HotKey[index]=0; `2  
    HotKeyMask[index]=0; >[=`{B  
    bRemoved=TRUE; *.l=> #qF  
    KeyCount--; ka%pS  
    break; ox#4|<qM  
   } z# B) b5  
  } 1bs95Fh9Q  
 } iO`f{?b  
 return bRemoved; bYH_U4b  
} -v@^6bQVp  
q)zvePO#  
void VerifyWindow() %*=FLtBjo  
{ G[,VPC=  
 for(int i=0;i<MAX_KEY;i++){ epm|pA*  
  if(hCallWnd!=NULL){ 8, ^UQ5x  
   if(!IsWindow(hCallWnd)){ 7IH{5o\e  
    hCallWnd=NULL; >UH=]$0N  
    HotKey=0; 1sA-BQL  
    HotKeyMask=0; bNgcZ V.  
    KeyCount--; 9z}kkYk  
   }  ond/e&1  
  } iJeT+}  
 } }clNXtN  
} 5]+eLKXB  
&>{L"{  
BOOL CHookApp::InitInstance() | 'G$}]H  
{ v}@ 6"\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 2&#iHv  
 hins=AfxGetInstanceHandle(); i%w'Cs0y  
 InitHotkey(); %SXqJW^:  
 return CWinApp::InitInstance(); r; !us~  
} 5S bSz!s`$  
c2"OpI  
int CHookApp::ExitInstance() YN[D^;}  
{ ' ?t{-z,  
 VerifyWindow(); t-/^O  
 UnInit(); "p\KePc;@  
 return CWinApp::ExitInstance(); gO36tc:ce  
} GvY8O|a  
_`58G#z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file tnntHQ&b  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4V5*6O9(u  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ E)bP}:4V  
#if _MSC_VER > 1000 %+}\i'j7  
#pragma once -xlI'gNg7  
#endif // _MSC_VER > 1000 9'M({/7y  
qm@hD>W+  
class CCaptureDlg : public CDialog ` (<>`  
{ d"a`?+(Q  
 // Construction d1N&J`R\1  
 public: 1>1!oml1E  
  BOOL bTray; @P/{x@J  
  BOOL bRegistered; o? =u#=  
  BOOL RegisterHotkey(); UPsh Y  
  UCHAR cKey; :T2K\@  
  UCHAR cMask; \)hmg  
  void DeleteIcon(); e2v,#3Q\  
  void AddIcon(); O^GTPYW  
  UINT nCount; UF4QPPH4  
  void SaveBmp(); );vU=p"@  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~ nIZ g5  
  // Dialog Data ezeGw?/  
  //{{AFX_DATA(CCaptureDlg) 1Cthi[ B  
  enum { IDD = IDD_CAPTURE_DIALOG }; Gf>T{Q`,is  
  CComboBox m_Key; {S c1!2q  
  BOOL m_bControl; e^fjla5  
  BOOL m_bAlt; )`a R?_  
  BOOL m_bShift; SBA;p7^"  
  CString m_Path; oc.x1<Nd  
  CString m_Number; dc* #?G6^  
  //}}AFX_DATA UNJ|J$T]  
  // ClassWizard generated virtual function overrides <?eZ9eB  
  //{{AFX_VIRTUAL(CCaptureDlg) 4*]`s|fbu  
 public: tW +I?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); X$<?:f-  
 protected: R?k1)n   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <e"2<qVi  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); y g7z?AZ  
  //}}AFX_VIRTUAL =y ff.3mW\  
  // Implementation 4CqZvd C  
 protected: 3ul  
  HICON m_hIcon; {^v50d  
  // Generated message map functions ^H>vJT  
  //{{AFX_MSG(CCaptureDlg) {k>m5L  
  virtual BOOL OnInitDialog(); ;J<kG@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ' x|B'  
  afx_msg void OnPaint(); ~$5[#\5%G  
  afx_msg HCURSOR OnQueryDragIcon(); #t\Oq9}^  
  virtual void OnCancel(); #"jWPe,d  
  afx_msg void OnAbout(); zR:S.e<  
  afx_msg void OnBrowse(); 3j2}n o8O  
  afx_msg void OnChange(); H$ v4N8D8I  
 //}}AFX_MSG SU1, +7"  
 DECLARE_MESSAGE_MAP() 6YN4]  
}; Sx}h$E:  
#endif `8Gwf;P1  
LY"/ Q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [}Nfs3IlBw  
#include "stdafx.h" (jXgJ" m  
#include "Capture.h" ?tBEB5  
#include "CaptureDlg.h" |tmD`ndO  
#include <windowsx.h> NWf!c-':  
#pragma comment(lib,"hook.lib") p?%G|Q  
#ifdef _DEBUG dM)fr  
#define new DEBUG_NEW I".r`$XZ  
#undef THIS_FILE 6@ + >UZr\  
static char THIS_FILE[] = __FILE__; r$+9grm<  
#endif ~k&b3-A}  
#define IDM_SHELL WM_USER+1 x;N?'"GP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JprZ6 >  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jtA Yp3M-$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @0aUWG!k  
class CAboutDlg : public CDialog $0WAhq  
{ s%Z3Zj(,8(  
 public: _)ERi*}x8  
  CAboutDlg(); #3.\}d)  
  // Dialog Data ms~ mg:  
  //{{AFX_DATA(CAboutDlg) \K?3LtJ  
  enum { IDD = IDD_ABOUTBOX }; %'P58  
  //}}AFX_DATA  zE{.oi  
  // ClassWizard generated virtual function overrides c=7L)w:I  
  //{{AFX_VIRTUAL(CAboutDlg) yjr!8L:m  
 protected: _3`{wzMA  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b2z~C{l  
  //}}AFX_VIRTUAL ";Lpf]<  
  // Implementation ]+oPwp;il  
 protected: p%n}a%%I  
  //{{AFX_MSG(CAboutDlg) HYtkSsXLN  
  //}}AFX_MSG 9nB:=`T9  
  DECLARE_MESSAGE_MAP() J,k{Bm  
}; 1w35 H9\g  
E*[X\70  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .n"aQ@!  
{ RS$e^_W  
 //{{AFX_DATA_INIT(CAboutDlg) Lq yY??\@  
 //}}AFX_DATA_INIT sb;81?|  
} :.@gd7T  
)@Ly{cw   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Iu%S><'+  
{ CFVe0!\  
 CDialog::DoDataExchange(pDX); &a O3N  
 //{{AFX_DATA_MAP(CAboutDlg) Zl]\sJ1"  
 //}}AFX_DATA_MAP cU+/I>V  
} #Ez>]`]TB  
ms<?BgCSz  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) , !c.  
 //{{AFX_MSG_MAP(CAboutDlg) q[r|p"TGov  
 // No message handlers ^>[Z~G($  
 //}}AFX_MSG_MAP RXh/[t+  
END_MESSAGE_MAP() bA1uh]oB  
XjWoUnz  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) WPLAh_fe  
: CDialog(CCaptureDlg::IDD, pParent) JVU:`BH  
{ *V>Iv/(  
 //{{AFX_DATA_INIT(CCaptureDlg) ze]2-B4  
  m_bControl = FALSE; faThXq8B  
  m_bAlt = FALSE; nx=Zl:Q}  
  m_bShift = FALSE; POdG1;)  
  m_Path = _T("c:\\"); ZY=x$($f  
  m_Number = _T("0 picture captured."); J v'$6[?  
  nCount=0; Rj1Z  
  bRegistered=FALSE; ?~;G)5  
  bTray=FALSE; C;M.dd  
 //}}AFX_DATA_INIT 5|";L&`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 YX,y7Uhn  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }h>QkV,{2  
} AW1691Q  
}_Jr[iaB  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) h0L *8P`t  
{ hQvSh\p  
 CDialog::DoDataExchange(pDX); "^yTH/m  
 //{{AFX_DATA_MAP(CCaptureDlg) g*TAaUs|n  
  DDX_Control(pDX, IDC_KEY, m_Key); 6;k#|-GU&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $s$z"<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); g!i\ AMG?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 94LFElE3  
  DDX_Text(pDX, IDC_PATH, m_Path); '*|Wi}0R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4l560Fb'U  
 //}}AFX_DATA_MAP L@XhgQ  
} b&. o9PV"  
/X {:~*.z  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `XS6t)!ik  
//{{AFX_MSG_MAP(CCaptureDlg) UJ<eF/KSmG  
 ON_WM_SYSCOMMAND() ~Qeyh^wo  
 ON_WM_PAINT() kT t;3Ia  
 ON_WM_QUERYDRAGICON() ~bhesWk8!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) :VX?j 3qW  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) P'xq+Q  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .-Ggvw  
//}}AFX_MSG_MAP _py%L+&{  
END_MESSAGE_MAP() 7g[T#B'/x,  
MPhO#;v  
BOOL CCaptureDlg::OnInitDialog() iZ yhj%#  
{ Tj$D:xKf)  
 CDialog::OnInitDialog(); Ni7~ Mjjt  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); POdk0CuX  
 ASSERT(IDM_ABOUTBOX < 0xF000); t ]7>' U  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =Wn11JGh  
 if (pSysMenu != NULL) 3XjM@D  
 { 7;ZSeQ yC  
  CString strAboutMenu; ^(r?k_i/  
  strAboutMenu.LoadString(IDS_ABOUTBOX); "9:1>Gr{G  
  if (!strAboutMenu.IsEmpty()) ?kMG!stgp}  
  { ]#z^G  
   pSysMenu->AppendMenu(MF_SEPARATOR); CA, &R <]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); yS%IE>?  
  }  A M8bem~  
 } c&vY0/ [  
 SetIcon(m_hIcon, TRUE); // Set big icon )/A IfH  
 SetIcon(m_hIcon, FALSE); // Set small icon Q&S\?cKe  
 m_Key.SetCurSel(0); PBc.}TSGj  
 RegisterHotkey();  BR;f!  
 CMenu* pMenu=GetSystemMenu(FALSE); YtI 2Vr/9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ju4={^#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <1cYz\/ !M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %Aq+t&-BCX  
 return TRUE; // return TRUE unless you set the focus to a control ="hh=x.5J  
} =QXLr+ y@  
k\rzvo=U  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +dIDFSd  
{ T>,3V:X  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) :\[W]  
 { .cJWYMC  
  CAboutDlg dlgAbout; sJu^deX  
  dlgAbout.DoModal(); bAS('R;4  
 } x@/ N9*  
 else A82Bn|J  
 { XG2&_u&  
  CDialog::OnSysCommand(nID, lParam); ~7a(KJgvd"  
 } HF>Gf2- C  
} 4Rj;lAlwB  
WxwSb`U|  
void CCaptureDlg::OnPaint() /3`#ldb%}  
{ ?\[2Po]n  
 if (IsIconic()) l+g\xUP  
 { aD)XxXwozm  
  CPaintDC dc(this); // device context for painting k/[*Wz$W  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); W3K&C[f  
  // Center icon in client rectangle tg%s#lLeH  
  int cxIcon = GetSystemMetrics(SM_CXICON); mRVE@ pc2X  
  int cyIcon = GetSystemMetrics(SM_CYICON); {v{qPYNyh  
  CRect rect; Ws2SD6!4`  
  GetClientRect(&rect); 78a!@T1#  
  int x = (rect.Width() - cxIcon + 1) / 2; Zq wxi1  
  int y = (rect.Height() - cyIcon + 1) / 2; L,G{ t^j  
  // Draw the icon TTB1}j+V6  
  dc.DrawIcon(x, y, m_hIcon); 9gFb=&1k  
 } 'wh2787  
 else 2p'ujAK  
 { bMWL^*I  
  CDialog::OnPaint(); LvP{"K;   
 } oJ|8~:)  
} =fA* b  
$x_6 .AOZ,  
HCURSOR CCaptureDlg::OnQueryDragIcon() x\HHu]  
{ /B>p.%M[&  
 return (HCURSOR) m_hIcon; d:KUJ Y.  
} FCO5SX#-g  
7+^9"k7  
void CCaptureDlg::OnCancel() F<SCW+>z2a  
{ ma4Pmk  
 if(bTray) Hj&mwn]  
  DeleteIcon(); pPr/r& r  
  CDialog::OnCancel(); rHhn)m  
} ] Tc!=SV  
H"v3?g`S%  
void CCaptureDlg::OnAbout() |0!oSNJ  
{ 7)Zk:53]  
 CAboutDlg dlg; /58]{MfrJ  
 dlg.DoModal(); We7~tkl(  
} m$glRs @  
s"1:#.u  
void CCaptureDlg::OnBrowse() "r@f&Ssxb  
{ G55-{y9Q  
 CString str;  B _;W!  
 BROWSEINFO bi; B I9~% dm  
 char name[MAX_PATH]; S 6e<2G=O  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); o80?B~o  
 bi.hwndOwner=GetSafeHwnd(); +RIG8w]  
 bi.pszDisplayName=name; lgR;V]^YX  
 bi.lpszTitle="Select folder"; }` &an$Mu  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; wPhN_XV  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,SEC~)L  
 if(idl==NULL) {P'TtlEp  
  return; tnx)_f  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 'k|?M  
 str.ReleaseBuffer(); v9Kx`{1L  
 m_Path=str; '2`MT-  
 if(str.GetAt(str.GetLength()-1)!='\\') "6.JpUf  
  m_Path+="\\"; P bR6>'  
 UpdateData(FALSE); _Ju@<V$  
} z'cK,psq(  
I'"b3]DXG  
void CCaptureDlg::SaveBmp() ]-  
{ ce/Z[B+d  
 CDC dc; f-at@C1L%L  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %onUCN<O`  
 CBitmap bm; I%dFVt@  
 int Width=GetSystemMetrics(SM_CXSCREEN); S;0,UgB1  
 int Height=GetSystemMetrics(SM_CYSCREEN); Q)"L8v v  
 bm.CreateCompatibleBitmap(&dc,Width,Height); e;LJdd  
 CDC tdc; rL+K Sb  
 tdc.CreateCompatibleDC(&dc); "BN-Jvb7q  
 CBitmap*pOld=tdc.SelectObject(&bm); P(z#Wk  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8;'fWV? U  
 tdc.SelectObject(pOld); Z<j(ZVO  
 BITMAP btm; j 8lWra\y  
 bm.GetBitmap(&btm); -b1VY4m-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 6.]x@=Wm  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); kbij Zj{  
 BITMAPINFOHEADER bih; `1I@tz|  
 bih.biBitCount=btm.bmBitsPixel; &[]0yNG  
 bih.biClrImportant=0; Fi8'3/q-^  
 bih.biClrUsed=0; `Qzga}`"]  
 bih.biCompression=0; NzRpI5\.  
 bih.biHeight=btm.bmHeight; BIx Z4Ft  
 bih.biPlanes=1; PFP/Pe Ng;  
 bih.biSize=sizeof(BITMAPINFOHEADER); )ESF)aKMiz  
 bih.biSizeImage=size; 5o2W[<%v  
 bih.biWidth=btm.bmWidth; l=jfgsjc  
 bih.biXPelsPerMeter=0; lYZ5FacqC  
 bih.biYPelsPerMeter=0; CuE>=y- "I  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _)4YxmK%  
 static int filecount=0; $6p_`LD0  
 CString name; n0o'ns  
 name.Format("pict%04d.bmp",filecount++); \k6Ho?PL  
 name=m_Path+name; +.i?UHNB  
 BITMAPFILEHEADER bfh; J{98x zb  
 bfh.bfReserved1=bfh.bfReserved2=0; =F>@z4[P-  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ]?<j]u0J  
 bfh.bfSize=54+size; .A;D-"!  
 bfh.bfOffBits=54; Z,'#=K  
 CFile bf; 8"2 Y$*)(  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6#NptXB  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); XwlA W7lU=  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); c*+yJNm3>  
  bf.WriteHuge(lpData,size); FB<#N+L\  
  bf.Close(); [UJC/GtjS  
  nCount++; fV[(s7vW  
 } @=KuoIV  
 GlobalFreePtr(lpData); +8+@Az[e0  
 if(nCount==1) 2FHWOy /N@  
  m_Number.Format("%d picture captured.",nCount); 8= jl]q$<  
 else vR m.# +Td  
  m_Number.Format("%d pictures captured.",nCount); x"kc:F  
  UpdateData(FALSE); uo`O$k<;  
} Mx,QgYSu  
h-rPLU;Bw  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) w6F'rsko]  
{ FU-YI"  
 if(pMsg -> message == WM_KEYDOWN) ;aA,H&   
 { ZVo%ssVt  
  if(pMsg -> wParam == VK_ESCAPE) ]lj,GD)c  
   return TRUE; 9Vp|a&Ana  
  if(pMsg -> wParam == VK_RETURN) vfG4PJ 6  
   return TRUE; _C` cO  
 } F<8Rr#Z  
 return CDialog::PreTranslateMessage(pMsg); xA;o3Or  
} % j],6wW5J  
L%,tc~)A  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $+` YP  
{ RhM]OJd'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !mFx= +  
  SaveBmp(); imcq H  
  return FALSE; U1?*vwfKZ  
} ; z_ZZ(W  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ \RcB,?OK  
 CMenu pop; Eq>3|(UT  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); w_30g6tA  
 CMenu*pMenu=pop.GetSubMenu(0); 7I~Ww{  
 pMenu->SetDefaultItem(ID_EXITICON); n-m+@jRz  
 CPoint pt; nZ?BC O  
 GetCursorPos(&pt); J 00<NRxj"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); K-Bf=7F,  
 if(id==ID_EXITICON) J(*QtF  
  DeleteIcon(); + QcgLq  
 else if(id==ID_EXIT) w,L PM+  
  OnCancel(); sjOyg!e  
 return FALSE; tB"amv  
} ZKKz?reM'  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); QG\lXY,  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) k%w5V>]1  
 AddIcon(); G #.(% ,  
 return res; 4&r+K`C0  
} 0T,Qn{  
sW)C6 #  
void CCaptureDlg::AddIcon() j-2`yR  
{ :O:Rfmr~  
 NOTIFYICONDATA data; HC,YmO:df"  
 data.cbSize=sizeof(NOTIFYICONDATA); 1 h(oty2p  
 CString tip; uWw4l"RK`  
 tip.LoadString(IDS_ICONTIP); Skgvnmk[U  
 data.hIcon=GetIcon(0); 41luFtE9  
 data.hWnd=GetSafeHwnd(); @DgJxY|  
 strcpy(data.szTip,tip); V>}@--$c-r  
 data.uCallbackMessage=IDM_SHELL; ]PVPt,c  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; k|W=kt$P  
 data.uID=98; 'LZF^m _<<  
 Shell_NotifyIcon(NIM_ADD,&data); td^2gjr^5  
 ShowWindow(SW_HIDE); O_8ERxj g]  
 bTray=TRUE; aVv$k  
} X E]YKJ?|k  
%1ofu,%  
void CCaptureDlg::DeleteIcon() h4C DZ  
{ r(`;CY]@  
 NOTIFYICONDATA data; (p<QRb:&Z  
 data.cbSize=sizeof(NOTIFYICONDATA); '| Enc"U  
 data.hWnd=GetSafeHwnd(); JlAUie8  
 data.uID=98; YH33E~f  
 Shell_NotifyIcon(NIM_DELETE,&data); 0-~Y[X"9.  
 ShowWindow(SW_SHOW); /3D!,V,  
 SetForegroundWindow(); #yZZ$XOk  
 ShowWindow(SW_SHOWNORMAL); `{fqnNJE  
 bTray=FALSE; u9>zC QRO  
} *<*{gO?Q4  
0'!v-`.  
void CCaptureDlg::OnChange() m#SDB6l  
{ hQ&S*f&='  
 RegisterHotkey(); M0`nr}g  
} $3BCA)5:  
R }M'D15  
BOOL CCaptureDlg::RegisterHotkey() BcaMeb-Z  
{ kR%bdN  
 UpdateData(); WrhC q6  
 UCHAR mask=0; +}c '4hRv  
 UCHAR key=0; 4,L(  
 if(m_bControl) IVD1 mk  
  mask|=4; Q!/<=95E  
 if(m_bAlt) dzDh V{  
  mask|=2; I}/o`oc  
 if(m_bShift) G v[W)+3f  
  mask|=1; 'Im7^!-d  
  key=Key_Table[m_Key.GetCurSel()]; PbOLN$hP  
 if(bRegistered){ 9`}Wp2  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |+Z, 7~!  
  bRegistered=FALSE; l c)*HYqU  
 } ^.Cfa  
 cMask=mask; 03?TT,y$  
 cKey=key; jR7 , b5  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xN wKTIK$  
 return bRegistered; R? Y#>K  
} YK*2  
&T?>Kx  
  四、小结 HM%n`1ZU  
P_+S;(QQ~d  
  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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