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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: &%r<_1  
  ?<STl-]&  
  一、实现方法 #}S<O_  
E~`l/ W  
  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: [(*?  
)<[)7`  
#pragma data_seg("shareddata") Eal*){"<,?  
HHOOK hHook =NULL; //钩子句柄 si#1sdR  
UINT nHookCount =0; //挂接的程序数目 Pzte!]B  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 a~&euT2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 *u]aWx  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey "wnN 0 p  
static int KeyCount =0; &n~v;M  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ;S+]Z!5LT  
#pragma data_seg() 7& 'p"hF  
xl ,(=L]  
  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。 @7`=0;g  
Wgb L9'}B  
  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: V,&A? Y  
q!AcM d\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +d=w%r)  
cKey,UCHAR cMask) s2"<<P[q'  
{ 8c%_R23  
 BOOL bAdded=FALSE; 7'.]fs:  
 for(int index=0;index<MAX_KEY;index++){ 7f>~P_  
  if(hCallWnd[index]==0){ <lTLz$QE  
   hCallWnd[index]=hWnd; "=,IbC  
   HotKey[index]=cKey; >hO9b;F}  
   HotKeyMask[index]=cMask; p(. z#o#  
   bAdded=TRUE; J~|:Q.Rt`  
   KeyCount++; L\xR<m<,  
   break; B{!*OC{l  
  } vP'#x  
 } 2?@Ozr2Uh  
 return bAdded; ){4!  
} Ud)2Mq1#M  
//删除热键 [oOV@GE  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nQ#NW8*Fs  
{ DLPg0>;jl  
 BOOL bRemoved=FALSE; eI1C0Uz1  
 for(int index=0;index<MAX_KEY;index++){ ={\9-JJhE  
  if(hCallWnd[index]==hWnd){ 65l9dM2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ b<j*;n.  
    hCallWnd[index]=NULL; Y2$xlqQd"  
    HotKey[index]=0; |: pBk:  
    HotKeyMask[index]=0; 7)*q@  
    bRemoved=TRUE; DFp">1@`PR  
    KeyCount--; +LF`ZXe8l  
    break; ) u1=, D  
   } UB w*}p  
  } r*UE>_3J  
 } rPK1#  
 return bRemoved; 6iS7Hao"  
} 3&zcdwPj  
up2wkc8  
EN5F*s@r  
  DLL中的钩子函数如下: Dlg9PyQ  
28>/#I9/]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) YL/B7^fd8  
{ *iJ>@ vew  
 BOOL bProcessed=FALSE; KM/c^ a4V  
 if(HC_ACTION==nCode) 4e?MthJ>  
 { p8MN>pLP%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 f@0Km^aUc  
   switch(wParam) QBjvbWoIG(  
   {  ~:99 )AOM  
    case VK_MENU: [JKLlR  
     MaskBits&=~ALTBIT; 0zE(:K  
     break; cToT_Mk  
    case VK_CONTROL: e17]{6y  
     MaskBits&=~CTRLBIT; P98g2ak  
     break; f1q0*)fk  
    case VK_SHIFT: !-4VGt&c,  
     MaskBits&=~SHIFTBIT; yC[Q-P*rG  
     break; <sG}[:v  
    default: //judge the key and send message B#4'3Y-3  
     break; $pauPEe  
   } $V;0z~&!'  
   for(int index=0;index<MAX_KEY;index++){ u<EPK*O*  
    if(hCallWnd[index]==NULL) T!-ly7-`  
     continue; bycnh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W8M(@* T  
    { nZ[`Yrq)0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); gnlU  
     bProcessed=TRUE; 6Oy6r  
    } 4jW <*jM  
   } 6foiN W+  
  } 2:&L|;  
  else if((lParam&0xc000ffff)==1){ //有键按下 mpD[k9`x#  
   switch(wParam) 8zQN[[#n  
   { @4$la'XSx  
    case VK_MENU: E+J+fi  
     MaskBits|=ALTBIT; ($t;Xab  
     break; Se>v|6  
    case VK_CONTROL: [X ]XH  
     MaskBits|=CTRLBIT; V^_U=Ed@M  
     break; 6ipQx/IQ  
    case VK_SHIFT: . dJBv  
     MaskBits|=SHIFTBIT; Jt3*(+J>/  
     break; eE@7AM  
    default: //judge the key and send message YcW) D  
     break; fni7HBV?  
   } ^(KDtc  
   for(int index=0;index<MAX_KEY;index++){ W&7(  
    if(hCallWnd[index]==NULL) qUk-BG8^  
     continue; fYlqaO4[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) De<i 8/^=  
    { @#yl_r%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [Xww`OUsh  
     bProcessed=TRUE; t:n$9WB)  
    } UTqKL*p523  
   } DuIgFp  
  } *S'?u_Y7  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 dv?t;D@p!  
   for(int index=0;index<MAX_KEY;index++){ 5>h/LE]"  
    if(hCallWnd[index]==NULL) lXXWQ=  
     continue; G$2Pny<!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *!yA'z<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Uurpho_~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 h;A~:}c,  
   } NT{ 'BJ  
  } er<_;"`1  
 } S~M/!Xb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); XpPcQIM*  
} BwVq:)P/R  
B5[As8Sa  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: N!<X% Ym  
~J >Jd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O6ltGtF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @eYD@!  
t-SZBNb  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: %!R\-Vej  
u$qazj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 57EL&V%j  
{ cL4Xh|NBp  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) [K1z/ea)V  
 { Rp>%umDyL  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 )"%J~:`h}  
  SaveBmp(); y2nT)nL  
  return FALSE; xPJ @!ks9  
 } rr2^sQ;_  
 …… //其它处理及默认处理 U-D00l7C  
} L;=LAQ6[  
+9M";'\c  
A(z m  
  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。 #-l+c u{  
7gREcL2  
  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。 tO3#kV\,  
 3bHB$n  
  二、编程步骤 C1OiMb(:  
~SI G0U8  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; \ *A!@T  
+kq+x6&  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; [}5mi?v  
J 2k4k  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Q1(4l?X@  
)ib$*dmUP  
  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; PB~ r7O]  
f,Am;:\ |  
  5、 添加代码,编译运行程序。 w,t !<i  
GyfKSj;  
三、程序代码 >b8-v~o{  
Us_1 #$p,  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL UD Pn4q  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {D8yqO A}  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Sx1OY0)s  
#if _MSC_VER > 1000 <&tdyAT?&  
#pragma once &,* ILz  
#endif // _MSC_VER > 1000 9}+X#ma.Nc  
#ifndef __AFXWIN_H__ /)sP<WPQ 6  
#error include 'stdafx.h' before including this file for PCH '_ys4hz}  
#endif lkJe7 +s  
#include "resource.h" // main symbols 7v}(R:*  
class CHookApp : public CWinApp RQ4+EW 1G  
{ NTVaz.  
 public: DXZZZ[#  
  CHookApp(); I/u>Gt  
  // Overrides Sa/]81 aG  
  // ClassWizard generated virtual function overrides @QE&D+NS  
  //{{AFX_VIRTUAL(CHookApp) tD,I7%|@  
 public: J|([(  
  virtual BOOL InitInstance(); o3:BH@@  
  virtual int ExitInstance(); N|/gwcKe  
  //}}AFX_VIRTUAL JW"n#sR4  
  //{{AFX_MSG(CHookApp) q9c-UQB(!  
  // NOTE - the ClassWizard will add and remove member functions here. FM|3'a-z  
  // DO NOT EDIT what you see in these blocks of generated code ! o ^ 08<  
  //}}AFX_MSG j.c{%UYj  
  DECLARE_MESSAGE_MAP() QY*F(S,\  
}; @h(Z;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); &ViK9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V7B%o:FZo  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cH707?p/I  
BOOL InitHotkey(); t ;fJ`.  
BOOL UnInit(); ^FZ9q  
#endif V 7D<'!  
*nEG<Y)  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. A o@WTs9  
#include "stdafx.h" AYDAt5K_  
#include "hook.h" +o35${  
#include <windowsx.h> 2'Raj'2S4  
#ifdef _DEBUG { T<[-"h  
#define new DEBUG_NEW 0v``4z2Z  
#undef THIS_FILE w|4CBll  
static char THIS_FILE[] = __FILE__; :_Iz( 2hV  
#endif )( pgJLW  
#define MAX_KEY 100 r4 qs!(  
#define CTRLBIT 0x04 =L`PP>"rW  
#define ALTBIT 0x02 U&SSc@of  
#define SHIFTBIT 0x01 z>b^Ui0  
#pragma data_seg("shareddata") n*TKzn4E  
HHOOK hHook =NULL; IsjN xBM  
UINT nHookCount =0; N|8^S  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey n^nQrRIp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT )JU`Z @?8  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey B_C."{G  
static int KeyCount =0; ZgmK~iJ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift bAUYJPRpy  
#pragma data_seg() g!i45]6[Nw  
HINSTANCE hins; !uA'0U?ky  
void VerifyWindow(); BM5)SgK  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =6N=5JePB  
//{{AFX_MSG_MAP(CHookApp) q(BRJ(  
// NOTE - the ClassWizard will add and remove mapping macros here. Iz&d S?p_  
// DO NOT EDIT what you see in these blocks of generated code! HUbXJsSP  
//}}AFX_MSG_MAP G0Z$p6z  
END_MESSAGE_MAP() e}s,WC2-  
X?]Mzcu  
CHookApp::CHookApp() i%MR<M  
{ |w-s{L3@+  
 // TODO: add construction code here, J ayax]u7J  
 // Place all significant initialization in InitInstance fT<3~Z>m  
} @;[.#hK  
<!X]$kvG  
CHookApp theApp; nVGOhYn  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) lg@q} ]1  
{ W7 +Q&4Y  
 BOOL bProcessed=FALSE; k;.<DN  
 if(HC_ACTION==nCode) GB}X  
 { SQk5SP  
  if((lParam&0xc0000000)==0xc0000000){// Key up 4ijZQ  
   switch(wParam) 'NnmLM(oh  
   { (e<p^T J]  
    case VK_MENU: PG'I7)Bv  
     MaskBits&=~ALTBIT; 0b2;  
     break; 5=!aq\ 5  
    case VK_CONTROL: w h^I|D?"  
     MaskBits&=~CTRLBIT; [Vou G{  
     break; 0%3T'N%  
    case VK_SHIFT: H$&P=\8n  
     MaskBits&=~SHIFTBIT; |D8c=c%  
     break; 6|1#Prj  
    default: //judge the key and send message "||G`%aO+t  
     break; p\xsW "=8q  
   } aQ)g7C  
   for(int index=0;index<MAX_KEY;index++){ u#Uc6? E  
    if(hCallWnd[index]==NULL) <a2Kc '  
     continue; ET3+07  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 92*Y( >  
    { eBW]hwhKzM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @2 SL$0!QA  
     bProcessed=TRUE; ^ X<ytOd5  
    }  TJb&f<  
   } VF9-&HuC  
  } o4&#,m+ :  
  else if((lParam&0xc000ffff)==1){ //Key down KYFkO~N  
   switch(wParam) $7\hszjZ  
   { JI92Dc*o  
    case VK_MENU: uTP4r  
     MaskBits|=ALTBIT; 0y#TGM|0D  
     break; 6r)qM)97  
    case VK_CONTROL: f&Meiu+  
     MaskBits|=CTRLBIT; 1)M%]I4  
     break; OH~I+=}.  
    case VK_SHIFT: >@^j9{\  
     MaskBits|=SHIFTBIT; PPNZ(j   
     break; 8f#&CC!L  
    default: //judge the key and send message lb#`f,r>  
     break; +' ?axv6e  
   } z^9df(  
   for(int index=0;index<MAX_KEY;index++) LD}ZuCp!  
   { f.u[!T  
    if(hCallWnd[index]==NULL) h&?tF~h  
     continue; ?I#zcD)w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oJEjg>%n  
    { *:V"C\`^n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L+" 5g@  
     bProcessed=TRUE; RIxGwMi%  
    } 1)=sbFtS  
   } {2%@I~US  
  } 3`m n#RM  
  if(!bProcessed){ F!yejn [  
   for(int index=0;index<MAX_KEY;index++){ M7n|Z{?(  
    if(hCallWnd[index]==NULL) q P>Gre  
     continue; ,LJX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _ ;_NM5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }\!38{&  
   } *Z"(K\1TH  
  } D'+kzb@  
 } 1PJ8O|Z t8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [.`#N1-@M  
} ws$!-t4<(  
\)vxZ!  
BOOL InitHotkey() mEe JK3D[  
{ QK%6Ncv  
 if(hHook!=NULL){ P$i?%P~  
  nHookCount++; NEh5    
  return TRUE; gb_k^wg~1'  
 } NbnuQPb'  
 else "J%/xj  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3pKr {U92  
  if(hHook!=NULL) 9*}?0J8  
   nHookCount++; }x1*4+Y1  
  return (hHook!=NULL); !jxz2Q  
} za20Y?)[  
BOOL UnInit() D0=H&Z[  
{ |JW-P`tL0  
 if(nHookCount>1){ &Rx-zp&dJ  
  nHookCount--; v1Lu.JQC$  
  return TRUE; 64OgE!  
 } wg[D*a  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7$7Y)&\5 w  
 if(unhooked==TRUE){ :jq   
  nHookCount=0; w%[ `'_[  
  hHook=NULL; EV 8}C=  
 } v/BMzVi  
 return unhooked; n1xN:A  
} L 59q\_|  
s:y=X$&M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) gs_nUgcA  
{ Q1Sf7)  
 BOOL bAdded=FALSE; AtN=G"c>_  
 for(int index=0;index<MAX_KEY;index++){ \P_1@sH=  
  if(hCallWnd[index]==0){ *@r)3  
   hCallWnd[index]=hWnd; b_]14 v  
   HotKey[index]=cKey; KS/1ux4x  
   HotKeyMask[index]=cMask; {g *kr1JM  
   bAdded=TRUE; F$FCfP7  
   KeyCount++; (!U5B Hnd  
   break; GyOo$FW  
  } 7)NQK9~  
 } joh=0nk;D  
 return bAdded; ruLi "d  
} 1B;sSp.>  
X'Dg= |  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k 4+F  
{ PYl(~Vac  
 BOOL bRemoved=FALSE; V Z[[zYe  
 for(int index=0;index<MAX_KEY;index++){ (ROurq"  
  if(hCallWnd[index]==hWnd){ n; 0bVVMV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ sV/#P<9  
    hCallWnd[index]=NULL; ;9pOtr  
    HotKey[index]=0; U<**Est  
    HotKeyMask[index]=0; =!'gV:M  
    bRemoved=TRUE; dIG(7 ~  
    KeyCount--; Oc;0*v[I  
    break; n_%JXm#\  
   } -< jb>8  
  } %QUV351H  
 } f$mfY6v  
 return bRemoved; 'Lft\.C  
} UDHk@M  
m-lUgx7  
void VerifyWindow() yG5T;O&  
{ #e0tT+  
 for(int i=0;i<MAX_KEY;i++){ SnRTC<DDh  
  if(hCallWnd!=NULL){ ip4:px-  
   if(!IsWindow(hCallWnd)){ R ;^[4<&  
    hCallWnd=NULL; g83!il\  
    HotKey=0; BlS0I%SN  
    HotKeyMask=0; ^{["]!f#  
    KeyCount--; :<w3.(Z  
   } $WvI%r  
  } ` !HGM>  
 } >b#z o,  
} ,ijgqEN  
lcij}-z:%e  
BOOL CHookApp::InitInstance() P@:#NU[  
{ wHk4BWg-  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); |n3PznV  
 hins=AfxGetInstanceHandle(); TSmuNCR  
 InitHotkey(); '8~7Ru\KyX  
 return CWinApp::InitInstance(); 8w~I(2S:#  
} ZGa>^k[:  
zr?%k]A%UO  
int CHookApp::ExitInstance() 6pI =?g  
{ !SIGzj  
 VerifyWindow(); X~Uvh8O  
 UnInit(); Aj.TX%}`h  
 return CWinApp::ExitInstance(); Nhn5 iN1*  
} ZVJbpn<lo)  
}%[TJ@R;  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "-kb=fY  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) l/`<iG%  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `h( JD$w  
#if _MSC_VER > 1000 f3s0.G#l  
#pragma once q(e&{pbM)  
#endif // _MSC_VER > 1000 db:b%1hk:  
0]{h,W3]@[  
class CCaptureDlg : public CDialog *@l NL=%R  
{ C',D"  
 // Construction PkQuN;a  
 public: m;lwMrY\7>  
  BOOL bTray; vL{~?vq6  
  BOOL bRegistered; |]HU$Gt S  
  BOOL RegisterHotkey(); qi}HJkOq  
  UCHAR cKey; "{&\nt  
  UCHAR cMask; :^71,An >E  
  void DeleteIcon(); >IC.Zt@  
  void AddIcon(); Y.3]vno?X  
  UINT nCount; BS>|M}G)r  
  void SaveBmp(); B%Dy;zdWd/  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }]N7CWy  
  // Dialog Data K0yTHX?(.  
  //{{AFX_DATA(CCaptureDlg) zFqH)/  
  enum { IDD = IDD_CAPTURE_DIALOG }; Axhe9!Fm  
  CComboBox m_Key; AQU4~g mI  
  BOOL m_bControl; 9`i=kp  
  BOOL m_bAlt; n`? j. s  
  BOOL m_bShift; ]y@9 z b  
  CString m_Path; ;#P@(ZVT  
  CString m_Number; mfQQ<Q@  
  //}}AFX_DATA RD_&m?d  
  // ClassWizard generated virtual function overrides nM34zVy  
  //{{AFX_VIRTUAL(CCaptureDlg) n>)CCf@H  
 public: U_m<W$"HF  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]T}G-  
 protected: '0GCaL*Sd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @>B#2t&  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :h=];^/E  
  //}}AFX_VIRTUAL (]^9>3{|  
  // Implementation *L%HH@] %_  
 protected: |8 c3%jve  
  HICON m_hIcon; DGj:qd(  
  // Generated message map functions gpVZZ:~  
  //{{AFX_MSG(CCaptureDlg) HvN!_}[  
  virtual BOOL OnInitDialog(); vXLiYWo  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Zk"'x,]#  
  afx_msg void OnPaint(); y/h~oGxy  
  afx_msg HCURSOR OnQueryDragIcon(); )&+j#:  
  virtual void OnCancel(); g+t-<D"L5  
  afx_msg void OnAbout(); kjfZ*V=-  
  afx_msg void OnBrowse(); }L>}_NV\  
  afx_msg void OnChange(); D'ZR>@w@  
 //}}AFX_MSG z J93EtlF  
 DECLARE_MESSAGE_MAP() 6C4c.+S  
}; b %L8mX  
#endif {3@f(H m  
I!dA{INN  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 57*z0<  
#include "stdafx.h" T=(/n=  
#include "Capture.h" R22YKXU  
#include "CaptureDlg.h" ZZ?0%9  
#include <windowsx.h> _?M34&.X  
#pragma comment(lib,"hook.lib") IP7j)SM!  
#ifdef _DEBUG M' e<\wqm  
#define new DEBUG_NEW vm"LPwSk>  
#undef THIS_FILE %B}Q.'  
static char THIS_FILE[] = __FILE__; Z,)4(#b =  
#endif ;e4 15T  
#define IDM_SHELL WM_USER+1 u)Y~+ [Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VdjS\VYe,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P}29wrIZ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; K#_&}C^-jY  
class CAboutDlg : public CDialog ,dhJ\cQ~  
{ -KhNsUQk  
 public: B>rz<bPT  
  CAboutDlg(); p:Ry F4{b2  
  // Dialog Data 3_|<CE6  
  //{{AFX_DATA(CAboutDlg) n/6#rj^$  
  enum { IDD = IDD_ABOUTBOX }; "s]r"(MX  
  //}}AFX_DATA FeoI+K A  
  // ClassWizard generated virtual function overrides $nF|n+m  
  //{{AFX_VIRTUAL(CAboutDlg) 0^$L{V  
 protected: Z8E-(@`q5Q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #%O|P&rA  
  //}}AFX_VIRTUAL r*HbglB  
  // Implementation `qnp   
 protected: :+NZW9_  
  //{{AFX_MSG(CAboutDlg) 7rQwn2XD{  
  //}}AFX_MSG w=:o//~6j  
  DECLARE_MESSAGE_MAP() G2qv)7{l2  
}; h?R{5?RxK  
H xs'VK*  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 94VtGg=b}  
{ -{`8Av5)E%  
 //{{AFX_DATA_INIT(CAboutDlg) g%Bh-O9\  
 //}}AFX_DATA_INIT IR;l{q&`  
} mSLA4[4{  
2 j.6  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7OAM  
{ >RJjm&M  
 CDialog::DoDataExchange(pDX); -!;2?6R9{  
 //{{AFX_DATA_MAP(CAboutDlg) EP,j+^RVf  
 //}}AFX_DATA_MAP WX .Ax$fT  
} W*S}^6ZT`  
\4Uhc3  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +7\$wc_1I@  
 //{{AFX_MSG_MAP(CAboutDlg) & "i4og<  
 // No message handlers "uCO?hv0  
 //}}AFX_MSG_MAP =~zsah6N  
END_MESSAGE_MAP() R!i\-C1 S  
L$L/5/  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) G0#<SJ,)  
: CDialog(CCaptureDlg::IDD, pParent) Y TpiOPf  
{ )5T82=[h<  
 //{{AFX_DATA_INIT(CCaptureDlg) Gyx4}pV  
  m_bControl = FALSE; &1 /OwTI4J  
  m_bAlt = FALSE; S[ch/  
  m_bShift = FALSE; -t]3 gCLb  
  m_Path = _T("c:\\"); L4O.=*P1  
  m_Number = _T("0 picture captured."); LMKhtOZ?  
  nCount=0; E{;F4wT_@  
  bRegistered=FALSE; {zX]4 1T  
  bTray=FALSE;  I~T   
 //}}AFX_DATA_INIT 4)"S /u  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 e!W U  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~c,CngeL0  
} +*RaX (&  
I(<9e"1O  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ai%*s&0/Y  
{ {W+IUvn  
 CDialog::DoDataExchange(pDX); 6ChFsteGFr  
 //{{AFX_DATA_MAP(CCaptureDlg) W4;/;[/L  
  DDX_Control(pDX, IDC_KEY, m_Key); mT:NC'b<9  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); dx@|M{jz'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); |kY}G3/  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Hr_5N,  
  DDX_Text(pDX, IDC_PATH, m_Path); .n n&K}h  
  DDX_Text(pDX, IDC_NUMBER, m_Number); :)Pj()Os|  
 //}}AFX_DATA_MAP 3 daI_Nx>  
} Y5CDdn  
Um}f7^fp^l  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]p8 zT|bv  
//{{AFX_MSG_MAP(CCaptureDlg) 7}:+Yx  
 ON_WM_SYSCOMMAND() l+#J oc<8  
 ON_WM_PAINT() WNY:HH  
 ON_WM_QUERYDRAGICON() |nCVM\+5T  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  nU4to  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]_BH"ng}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]A ;.}1'  
//}}AFX_MSG_MAP %pIP#y[4  
END_MESSAGE_MAP() 0G31Kou  
?7>"ZGDe>  
BOOL CCaptureDlg::OnInitDialog() 7u{V1_ n1  
{ q<j9l'dHG  
 CDialog::OnInitDialog(); @U3:9~Q  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +Xp1=2Mq  
 ASSERT(IDM_ABOUTBOX < 0xF000); OlB9z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); MyZVx|7 E  
 if (pSysMenu != NULL) 7Db}bDU1 |  
 { ,<N{Y[n]e  
  CString strAboutMenu; @@j:z;^|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); zYrJ Hn#vB  
  if (!strAboutMenu.IsEmpty()) s+~GQcj<T  
  { m]vS"AdX  
   pSysMenu->AppendMenu(MF_SEPARATOR); j]FK.G'  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); jST4O"DjM  
  } h%U}Y5Ps~  
 } 55 '  
 SetIcon(m_hIcon, TRUE); // Set big icon oYdE s&qq  
 SetIcon(m_hIcon, FALSE); // Set small icon G^N@ r:RS  
 m_Key.SetCurSel(0); w3ATsIw  
 RegisterHotkey(); *|<T@BXn  
 CMenu* pMenu=GetSystemMenu(FALSE); C6EGM/m8  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -#v1/L/=  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); XUzOt_L5<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); DF_wMv:>^  
 return TRUE; // return TRUE unless you set the focus to a control F^$;hMh%  
} obE8iG@H  
}K8e(i6z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |_ +#&x  
{ d)S`.Q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) n\)1Bz  
 { O2\(:tvw  
  CAboutDlg dlgAbout; }tw+8YWkz  
  dlgAbout.DoModal(); ^*i0~_  
 } P3`$4p?  
 else aW*k,\:e  
 { &e6UEG  
  CDialog::OnSysCommand(nID, lParam);  od{\z  
 } hf]m'5pb  
} {g#4E0.A!  
`vMhrn  
void CCaptureDlg::OnPaint() ;1[Z&Uv8  
{ zBlv?JwG  
 if (IsIconic()) ^~I@]5Pq  
 { 5wmd[YL  
  CPaintDC dc(this); // device context for painting l_/(J)|a  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 'UUj(1 f  
  // Center icon in client rectangle Vi:^bv  
  int cxIcon = GetSystemMetrics(SM_CXICON); :IU7dpwDl  
  int cyIcon = GetSystemMetrics(SM_CYICON); :^PksR  
  CRect rect; v+"4YIN  
  GetClientRect(&rect); |dqHpogh  
  int x = (rect.Width() - cxIcon + 1) / 2; `:Gzjngc  
  int y = (rect.Height() - cyIcon + 1) / 2; );':aX j  
  // Draw the icon s :7/\h  
  dc.DrawIcon(x, y, m_hIcon); "5Y6.$Cuf!  
 } 9M;t4Um  
 else @`dg:P*[  
 { ^t5My[R  
  CDialog::OnPaint(); V0v,s^\H  
 } >iae2W`  
} Fu_I0z  
eFG(2OVg}M  
HCURSOR CCaptureDlg::OnQueryDragIcon() sa4w.9O1GS  
{ \$ipnQv  
 return (HCURSOR) m_hIcon; o^vX\a?`u  
} vo`&  
7Vsp<s9bj  
void CCaptureDlg::OnCancel() kFwFPK%B  
{ m9oOH5@K~  
 if(bTray) -1,0hmn=+  
  DeleteIcon(); <kdlXS>J.  
  CDialog::OnCancel(); Q}|K29Y:p  
} N=BG0t$  
8{!d'Pks  
void CCaptureDlg::OnAbout() >< $LV&  
{ L)bMO8JH~m  
 CAboutDlg dlg; &jHsFS  
 dlg.DoModal(); \jtA8o%n  
} NC%hsg^0/  
Z-Qp9G'   
void CCaptureDlg::OnBrowse() 4MzQH-U>/  
{ X+aQ 7^"s  
 CString str; GYx0U8MJ[e  
 BROWSEINFO bi; :.,9}\LK  
 char name[MAX_PATH]; RyJy%| \-S  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ]a4U\yr  
 bi.hwndOwner=GetSafeHwnd(); 3NgXM  
 bi.pszDisplayName=name; l,7& z  
 bi.lpszTitle="Select folder"; Z 5>~l  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; &rBe -52  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); -!Myw&*\V  
 if(idl==NULL) t1adS:)s  
  return; g[O?wH-a  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?`piie9V  
 str.ReleaseBuffer(); W5 F\e[Ax5  
 m_Path=str; 25)9R^  
 if(str.GetAt(str.GetLength()-1)!='\\') ipv5JD[  
  m_Path+="\\"; 3B1\-ry1M  
 UpdateData(FALSE); YN8x|DLi?  
} 0'Pjnk-i  
_?c.m*)A  
void CCaptureDlg::SaveBmp() nGF +a[Z  
{ Z.\q$U7'9  
 CDC dc; fkxkf^g)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); KL&/Yt   
 CBitmap bm; OIblBQ!  
 int Width=GetSystemMetrics(SM_CXSCREEN); h* S"]ye5  
 int Height=GetSystemMetrics(SM_CYSCREEN); $Rm~ VwY#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); tu -a`h_NJ  
 CDC tdc; .zO^"mXjS  
 tdc.CreateCompatibleDC(&dc); [b++bCH3  
 CBitmap*pOld=tdc.SelectObject(&bm); 2 2v"?*  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >tM4|w|  
 tdc.SelectObject(pOld); >]h{[kU %4  
 BITMAP btm; sVFO&|L  
 bm.GetBitmap(&btm); Qte5E}V`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [3Q0KCZ0(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |bnd92fvks  
 BITMAPINFOHEADER bih; 7 Lm9I  
 bih.biBitCount=btm.bmBitsPixel; xs"i_se  
 bih.biClrImportant=0; t!?`2Z5  
 bih.biClrUsed=0; 'LYDJ~  
 bih.biCompression=0; 8~'cP?  
 bih.biHeight=btm.bmHeight; lJK]S=cd  
 bih.biPlanes=1; 4$Ai!a  
 bih.biSize=sizeof(BITMAPINFOHEADER); `c Gks  
 bih.biSizeImage=size; F-;JN  
 bih.biWidth=btm.bmWidth; 4:V +>Jt  
 bih.biXPelsPerMeter=0; fQoAdw  
 bih.biYPelsPerMeter=0; )PN8HJAArh  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); v `S5[{6  
 static int filecount=0; ('z=/"(l  
 CString name; %xgP*%Sv2  
 name.Format("pict%04d.bmp",filecount++); uX7L1~s-  
 name=m_Path+name; o]? yyP  
 BITMAPFILEHEADER bfh; Q7+WV`&  
 bfh.bfReserved1=bfh.bfReserved2=0; ;j0.#P:a  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 0F$|`v"0  
 bfh.bfSize=54+size; 7'wpPXdY1  
 bfh.bfOffBits=54; )q$[uS_1[  
 CFile bf; 0}i 9`p  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ cj>@Jx}]M  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); >@N.jw>#T  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^A ]4  
  bf.WriteHuge(lpData,size);  <$nPGz)}  
  bf.Close(); K'&,]r#  
  nCount++; `q}D#0  
 } UC&$8^  
 GlobalFreePtr(lpData); nDkG}Jk B!  
 if(nCount==1) %`~4rf"7  
  m_Number.Format("%d picture captured.",nCount); u$w.'lK  
 else h%j4(v}r{C  
  m_Number.Format("%d pictures captured.",nCount); $ DN.  
  UpdateData(FALSE); 'M%iS4b{IM  
} ir^d7CV,   
dO D(<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xbiprhdv  
{ tN{0C/B9  
 if(pMsg -> message == WM_KEYDOWN) v8-szW).  
 { <(E)M@2  
  if(pMsg -> wParam == VK_ESCAPE) }Z <I%GT  
   return TRUE; mLq0;uGL|  
  if(pMsg -> wParam == VK_RETURN) T#&1q]P1F  
   return TRUE; U'jmgHq  
 } +HE,Q6-A  
 return CDialog::PreTranslateMessage(pMsg); W@}@5,}f>  
} thPAD+u.3  
X[J<OTj`$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) WGV]O|  
{ 2`i &6iz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Z{3=.z{&^=  
  SaveBmp(); !jP[=  
  return FALSE;  o]0E  
} ,vR>hyM  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ DvWBvs,  
 CMenu pop; 0Cc3NNdz  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [?z;'O}y  
 CMenu*pMenu=pop.GetSubMenu(0); '(lsJY[-x  
 pMenu->SetDefaultItem(ID_EXITICON); K81FKV.  
 CPoint pt; li3X}  
 GetCursorPos(&pt); 41R~.?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); K*~xy bA  
 if(id==ID_EXITICON) , wk}[MF  
  DeleteIcon(); SP0ueAa}  
 else if(id==ID_EXIT) i% 0 qN  
  OnCancel(); Q8TR@0d  
 return FALSE; ^cd bM  
} ; <- f  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +)9=bB  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) JNU9RxR  
 AddIcon(); 1xxTI{'g[  
 return res; %5ov!nm7  
} 7\dt<VV  
g9GPy U  
void CCaptureDlg::AddIcon() NrcV%-+u%  
{ #E4oq9{0*W  
 NOTIFYICONDATA data; <MxA;A  
 data.cbSize=sizeof(NOTIFYICONDATA); i&HU7mP/  
 CString tip; s]vsD77&  
 tip.LoadString(IDS_ICONTIP); B_!S\?}$  
 data.hIcon=GetIcon(0); n~,6!S  
 data.hWnd=GetSafeHwnd(); f`}u9!jVR  
 strcpy(data.szTip,tip); HELTL$j,b  
 data.uCallbackMessage=IDM_SHELL; z#5qI',L  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Ow0~sFz  
 data.uID=98; 2Z(?pJyDM  
 Shell_NotifyIcon(NIM_ADD,&data); K/&  
 ShowWindow(SW_HIDE);  X56.Y.  
 bTray=TRUE; T5[(vTp  
} j%!xb><  
.j!:Hp(z}  
void CCaptureDlg::DeleteIcon() j"0TAYmXwu  
{ &S^a_L:  
 NOTIFYICONDATA data; ?r0>HvUf!l  
 data.cbSize=sizeof(NOTIFYICONDATA); f]+. i-c=  
 data.hWnd=GetSafeHwnd(); 2$Z4 >!  
 data.uID=98; 8LtkP&Wx  
 Shell_NotifyIcon(NIM_DELETE,&data); .>5E 4^$%  
 ShowWindow(SW_SHOW); 5Shc$Awc!  
 SetForegroundWindow(); eET1f8 B=L  
 ShowWindow(SW_SHOWNORMAL); 5t-(MY  
 bTray=FALSE; `yXHb  
} yX\~ {%  
r^d:Po  
void CCaptureDlg::OnChange() ~\R+p~>  
{ !O,`Z`T?  
 RegisterHotkey(); V=GP_^F  
} 5X`m.lhUc  
7*&q"   
BOOL CCaptureDlg::RegisterHotkey() EU7mP MxJ  
{ ~:A=o?V2  
 UpdateData(); gdBH\K(\  
 UCHAR mask=0; [MM`#!K%  
 UCHAR key=0; Cp-p7g0wlg  
 if(m_bControl) dqL)q3  
  mask|=4; ~<_P jV  
 if(m_bAlt) o 3 G*   
  mask|=2; "CQ:<$|$  
 if(m_bShift) /;1h-Rc>  
  mask|=1; W GMEZx  
  key=Key_Table[m_Key.GetCurSel()]; tw]Q5:6  
 if(bRegistered){ "IdN*K  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); XuW>GT/  
  bRegistered=FALSE; wtro'r3  
 } 9&KiG* .  
 cMask=mask; yFqB2(Dv  
 cKey=key; &FzZpH  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]OA8H[U-eA  
 return bRegistered; G C3G=DTt  
} a^GJR]] {  
dxeLu  
  四、小结 jUX0sRDk  
*1b)Va8v*  
  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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