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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: O[9>^y\,  
  cV=0)'&<`_  
  一、实现方法 An cka  
ii< /!B(  
  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: $~$NQe!/  
]/G~ L  
#pragma data_seg("shareddata") x~!gGfP  
HHOOK hHook =NULL; //钩子句柄 nT(Lh/  
UINT nHookCount =0; //挂接的程序数目 `7.(dn>WL0  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 eouxNw}F1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 WA~PE` U  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey PubO|Mf  
static int KeyCount =0; ~353x%e'  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 adi^*7Q] )  
#pragma data_seg() R^[b I;  
[(*ObvEF  
  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。 L[Z SgRTu  
y `)oD0)Fj  
  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: >bgx o<  
# Uc0 W  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR BWtGeaW/sr  
cKey,UCHAR cMask) qFqK. u  
{ &OK[n1M  
 BOOL bAdded=FALSE;  1rnbUE  
 for(int index=0;index<MAX_KEY;index++){ w$E8R[J~P  
  if(hCallWnd[index]==0){ 9E@}@ZV(  
   hCallWnd[index]=hWnd; @51!vQwqR  
   HotKey[index]=cKey; #Cj$;q{!  
   HotKeyMask[index]=cMask; 3Ryae/Nk  
   bAdded=TRUE; #2dd`F8  
   KeyCount++; UW!*=?h  
   break; lWiC$  
  } !(%^Tg=  
 } nnw5 !q_  
 return bAdded; pn5A6 #  
} Mg7nv\6  
//删除热键 F. N4Q'2Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ZvQ~K(3  
{ 8y9`xRy  
 BOOL bRemoved=FALSE; Cob<N'.  
 for(int index=0;index<MAX_KEY;index++){ #b^x!lR  
  if(hCallWnd[index]==hWnd){ e!eUgD  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d]fo>[%Xr  
    hCallWnd[index]=NULL;  Sj,>O:p  
    HotKey[index]=0; HU~,_m  
    HotKeyMask[index]=0; ap 5D6y+  
    bRemoved=TRUE; .}xF2'~E/  
    KeyCount--; E%+aqA)f  
    break; oU\Q|mN(  
   } y2_^lW%  
  } :)~idVlV  
 } ,_G((oS40  
 return bRemoved; oBBL7/L  
} f@G3,u!]i  
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:J 7p=sX  
  DLL中的钩子函数如下: ?PpGBm2f*  
 !623;   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) hny(:Dj  
{ @i" ^b  
 BOOL bProcessed=FALSE; t;>"V.F<1  
 if(HC_ACTION==nCode)  4E"OD+  
 { J|'e.1v  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 lZ\Si  
   switch(wParam) *8WcRx  
   {  >TnV Lx<  
    case VK_MENU: E~b Yk6  
     MaskBits&=~ALTBIT; 2r 0u[  
     break; bD: yu  
    case VK_CONTROL: 1@i 8ASL  
     MaskBits&=~CTRLBIT; ptA-rX.  
     break; Ts~MkO  
    case VK_SHIFT: s#nd:$p3  
     MaskBits&=~SHIFTBIT; +"~~; J$  
     break; @u4q\G\  
    default: //judge the key and send message \!]Zq#*kH  
     break; 4R;6u[ a]u  
   } |afzW=8'  
   for(int index=0;index<MAX_KEY;index++){ [~%\:of70n  
    if(hCallWnd[index]==NULL) Za5bx,^  
     continue; ~_;x o?@ba  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c@uNA0 p  
    { lZ\8$,B)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); );m7;}gE  
     bProcessed=TRUE; ~9tPT 0^+  
    } sz7|2OV"  
   } T({]fc!c  
  } 2O*(F>>dT  
  else if((lParam&0xc000ffff)==1){ //有键按下 FHoY=fCI  
   switch(wParam) T#>1$0yv  
   { 7GyJmzEE  
    case VK_MENU: @D'NoA@1A  
     MaskBits|=ALTBIT; )q+Qtz6D  
     break; n)~9  
    case VK_CONTROL: GfG!CG^ %  
     MaskBits|=CTRLBIT; z }t{bm  
     break; F74^HQ*J  
    case VK_SHIFT: uyp|Xh,  
     MaskBits|=SHIFTBIT; 4a]$4LQV  
     break; GadZ!_.f  
    default: //judge the key and send message xe=/T# %  
     break; Lwy9QZL  
   } P ~sX S  
   for(int index=0;index<MAX_KEY;index++){ @@])B#  
    if(hCallWnd[index]==NULL) 5LIbHSK  
     continue; @Yl&Jg2l'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m$w'`[H  
    { fD1a)Az  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); byyzXRO;  
     bProcessed=TRUE; 2G(RQ\Ro*  
    } 3BSJ|o<"=  
   } QoU0>p+ 2  
  } NI1jJfH|l  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 + Q $J q  
   for(int index=0;index<MAX_KEY;index++){ ;I#f:UQ  
    if(hCallWnd[index]==NULL) |k3^ eeLk  
     continue; nWyn}+C-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7Zf * T  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  4dd]Ju  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 t:SME'~.P  
   } "< c,I=A  
  }  UE-+P  
 } i8kyYMPP  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); aj$#8l |zu  
} >=WlrmI  
wcd1.$ n  
  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: tlz+!>  
<z=d5g{n  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sK&[sN33  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u=U. +\f5  
|$)+h\h  
  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: K).Gj2 $  
LzS)WjEN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [ q% Rx!L  
{ l-} );zH74  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) @_+B'<2  
 { '/ >7pB  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 <6djdr1:b  
  SaveBmp(); 8,l~e8&  
  return FALSE; !n?8'eqWru  
 } {cW%i:  
 …… //其它处理及默认处理 AMm)E  
} qkLp8/G>pO  
6UXDIg=  
zj+.MG04  
  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。 Ha}TdQ%  
8d!t"oj68  
  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。 da,Bnze0  
-k+}w_<Q  
  二、编程步骤 Ul/Uk n$  
a@ub%laL Z  
  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"; E76#xsyhF  
-D4"uoN.  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 6^'BhHP  
&azy1.i~  
  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; &`9p.  
lo!.%PP|  
  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; >[D(<b(U&  
 V/8"@C  
  5、 添加代码,编译运行程序。 L2L=~/LG  
T08SGB]  
三、程序代码 O\"k[V?.V  
zo^34wW^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL !qQ B}sAf  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) &.ilku/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ V=?qU&r<+  
#if _MSC_VER > 1000 4fq:W`9sN  
#pragma once xe!([^l&  
#endif // _MSC_VER > 1000 Ei Yj`P  
#ifndef __AFXWIN_H__ T- |36Os4  
#error include 'stdafx.h' before including this file for PCH n;F/}:c_a  
#endif ;Sqn w  
#include "resource.h" // main symbols $$tFP"pZ  
class CHookApp : public CWinApp 'Y%@fZf x  
{ 2# 1G)XI  
 public: aYBc)LCd  
  CHookApp(); w`Ss MI  
  // Overrides 9r efv  
  // ClassWizard generated virtual function overrides k\NwH?ppu  
  //{{AFX_VIRTUAL(CHookApp) k-zkb2  
 public: q9^6A90  
  virtual BOOL InitInstance(); C;EC4n+s  
  virtual int ExitInstance(); $ncJc  
  //}}AFX_VIRTUAL W{v{sQg  
  //{{AFX_MSG(CHookApp) s[}4Q|s%  
  // NOTE - the ClassWizard will add and remove member functions here. lQ]8PR t8  
  // DO NOT EDIT what you see in these blocks of generated code ! K!\$MBI  
  //}}AFX_MSG \%! t2=J!  
  DECLARE_MESSAGE_MAP() }=fVO<R v  
}; Wt,t5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1e'Ez4*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jk\04k  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :Nt_LsH  
BOOL InitHotkey(); \mIm}+!H  
BOOL UnInit(); X;vfbF   
#endif ~:ldGfb|  
a*g7uaoP  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. T0Kjnzs  
#include "stdafx.h" naHQeX;  
#include "hook.h" O #  
#include <windowsx.h> 8F;f&&L"y  
#ifdef _DEBUG yG ,oSp|  
#define new DEBUG_NEW #j?SdQ  
#undef THIS_FILE 0&@pD`K e  
static char THIS_FILE[] = __FILE__; l5*sCp*Z  
#endif 6HK dBW$/  
#define MAX_KEY 100 Uh tk`2O  
#define CTRLBIT 0x04 K*]^0  
#define ALTBIT 0x02 Ne=o+ $.(  
#define SHIFTBIT 0x01 >cV^f6fH  
#pragma data_seg("shareddata") RaBq@r*(  
HHOOK hHook =NULL; t V:oBT*  
UINT nHookCount =0; $}TK ,/W  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey it\U+xu  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `-J$7)d@  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey mx ]a@tu  
static int KeyCount =0; dTwZ-%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 2`ED?F68gH  
#pragma data_seg() {f12&t  
HINSTANCE hins; A{QXzoWkg0  
void VerifyWindow(); ]5_6m;g  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) I.qP$j  
//{{AFX_MSG_MAP(CHookApp) ?vd_8C2B  
// NOTE - the ClassWizard will add and remove mapping macros here. y. A]un1  
// DO NOT EDIT what you see in these blocks of generated code!  uK_R#^  
//}}AFX_MSG_MAP ,Q2?Z :l  
END_MESSAGE_MAP() }iZ>Gm '5  
s&gzv=v  
CHookApp::CHookApp() dPtQ Sa  
{ 1;Q>B>6  
 // TODO: add construction code here, AvxP0@.`  
 // Place all significant initialization in InitInstance :-.K.Ch|:  
} Jy?#@/~  
]JUb;B;Z  
CHookApp theApp; D |lm,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) S7A[HG;  
{ )= :gO`"D  
 BOOL bProcessed=FALSE; @ a$HJ:  
 if(HC_ACTION==nCode) Jm5&6=  
 { bTrQ(qp  
  if((lParam&0xc0000000)==0xc0000000){// Key up #dKHU@+U"  
   switch(wParam) yOQEF\  
   { B\ITXmd   
    case VK_MENU: @[vwqPOL  
     MaskBits&=~ALTBIT; VZRM=;V  
     break; </%n:<z4  
    case VK_CONTROL: !K~L&.\T  
     MaskBits&=~CTRLBIT; `H7V['  
     break; i,h)  
    case VK_SHIFT: eLd7|*|  
     MaskBits&=~SHIFTBIT; ,O;+fhUJ(  
     break; pEn3:.l<  
    default: //judge the key and send message / >As9|%  
     break; WL6p+sN'  
   } rK@UCRf  
   for(int index=0;index<MAX_KEY;index++){ 2 ~zo)G0  
    if(hCallWnd[index]==NULL) uINm>$G,5  
     continue; } XJZw|n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7ql&UIeQ  
    { Q~L"Mr8>V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vA(')"DDT  
     bProcessed=TRUE; kV mJG#  
    } Z\)emps  
   } jxt^d  
  } R\+O.vX  
  else if((lParam&0xc000ffff)==1){ //Key down _s&sA2r<  
   switch(wParam) sY#iGEf  
   { (_Ld^ ^|  
    case VK_MENU: S[_Hc$7U  
     MaskBits|=ALTBIT; eL7rX"!  
     break; UhX`BGpM{  
    case VK_CONTROL: ti)4J2c,8  
     MaskBits|=CTRLBIT; rf%NfU  
     break; .).*6{_  
    case VK_SHIFT: !N:: 1c@C  
     MaskBits|=SHIFTBIT; @rh1W$  
     break; %~ROV>&  
    default: //judge the key and send message h>l  
     break; P!Mz5QZ+  
   } G#~6a%VW  
   for(int index=0;index<MAX_KEY;index++) wU|Y`wJmF  
   { ,iUYsY  
    if(hCallWnd[index]==NULL) }: W6Bo-|  
     continue; 0tzMu#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QCI-YJ&o  
    { qZ:--,9+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); p(5'|eqBV  
     bProcessed=TRUE; Hsoe?kUHF  
    } }k-rOi'jL  
   } SLiQHWw*J  
  } b,7@)sZ*  
  if(!bProcessed){ 9=-!~ _'1-  
   for(int index=0;index<MAX_KEY;index++){ }+_Z|>qv  
    if(hCallWnd[index]==NULL) l*l(QvN_  
     continue; i n^Rf` "  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) x4HVB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <AzM~]"3  
   } 9bpY>ze  
  } Dyx3N5?C  
 } A#"AqNVWv  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4I[g{S nF  
} aXSTA ,%  
(aO+7ykRuJ  
BOOL InitHotkey() .-:R mYGR  
{ [}/\W`C  
 if(hHook!=NULL){ -6+&?f  
  nHookCount++; #\&jM -.-  
  return TRUE; KL4Z||n  
 } E+65  
 else *+E9@r=HF  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); z]NN ^pIa  
  if(hHook!=NULL) FL 5tIfV+  
   nHookCount++; Ve4!MM@ti  
  return (hHook!=NULL); U 9?!|h;7  
} tcg sXB/t  
BOOL UnInit() 0 w"&9+kV  
{ 4YVxRZ1[3  
 if(nHookCount>1){ ya9V+/i7T_  
  nHookCount--; ,UdTUw~F  
  return TRUE; e/?>6'6 5  
 } YdI|xu>0A^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 4Qr16,Us  
 if(unhooked==TRUE){ |7jUf$Q\p  
  nHookCount=0; ZW}0{8Dk  
  hHook=NULL; V m1U00lM{  
 } T1@]:`&  
 return unhooked; Hm?zMyO.k  
} !/w<F{cl  
S*o%#ZJN  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;UU+:~  
{ (i,TxjS'od  
 BOOL bAdded=FALSE; FS%Xq-c  
 for(int index=0;index<MAX_KEY;index++){ 0<+=Ew5Z  
  if(hCallWnd[index]==0){ /^E2BRI  
   hCallWnd[index]=hWnd; HDyus5g  
   HotKey[index]=cKey; K4vl#*qn  
   HotKeyMask[index]=cMask; ~CQYF,[Th  
   bAdded=TRUE; }5RCks;)*  
   KeyCount++; (~r"N?`  
   break; o3hsPzOQx  
  } o0>z6Ya<  
 } uC>X;<^   
 return bAdded; 5]WpH0kzO  
} ^n|u$gIF8  
[Hn4&PET  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) > dJvl|  
{ io]e]m%  
 BOOL bRemoved=FALSE; -vXX u;frt  
 for(int index=0;index<MAX_KEY;index++){ :bLLN  
  if(hCallWnd[index]==hWnd){ FuNc#n>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ zY<=r.m4  
    hCallWnd[index]=NULL; k,xY\r$  
    HotKey[index]=0; f$x\~y<[  
    HotKeyMask[index]=0; :N~1fvx  
    bRemoved=TRUE; bBkF,`/f$  
    KeyCount--; :[iWl8  
    break; `0tzQ>ZQq  
   } h Znq\p~  
  } hsVf/%  
 } @<ba+z>"~4  
 return bRemoved; `e t0i.  
} P9/5M4]tt  
-<gGNj.x-  
void VerifyWindow() |0?h6  
{ R=IZFwr  
 for(int i=0;i<MAX_KEY;i++){ ;Cdrjx  
  if(hCallWnd!=NULL){ +'$=\d^  
   if(!IsWindow(hCallWnd)){ C@` eYi  
    hCallWnd=NULL; &46h!gW  
    HotKey=0; .17WF\1HC.  
    HotKeyMask=0; sXm/+I^  
    KeyCount--; [YY[E 7  
   } G"bItdb  
  } 'aQ"&GX@  
 } NhyVX%qt:  
} I3QK~ V*j)  
T`f6`1x  
BOOL CHookApp::InitInstance() :,$:@  
{ y K~;LV  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); I| qoHN,g  
 hins=AfxGetInstanceHandle(); dnVl;L8L3  
 InitHotkey(); @, D 3$P8}  
 return CWinApp::InitInstance(); K@P5]}'#  
} )8ejT6r  
}vkrWy^  
int CHookApp::ExitInstance() 'W 5r(M4U  
{ k&4@$;Ap  
 VerifyWindow(); 3jIi$X06  
 UnInit(); =dD<[Iz6  
 return CWinApp::ExitInstance(); i DV.L  
} %D|27gh  
k=2]@K$%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *hVW >{a  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) l BS!=/7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .'C$w1[w  
#if _MSC_VER > 1000 XUmL8  
#pragma once %  (R10G  
#endif // _MSC_VER > 1000 SF2A?L?}+  
q1sK:)Hu+  
class CCaptureDlg : public CDialog xmxfXW  
{ zhbp"yju7  
 // Construction 9 WsPBzi"T  
 public: XJ~_FiB  
  BOOL bTray; `y; s1nL  
  BOOL bRegistered; 'f9 fw^  
  BOOL RegisterHotkey(); V3fd]rIP  
  UCHAR cKey; [#>ji+%=  
  UCHAR cMask; LuQ4TT  
  void DeleteIcon(); 1>OfJc(K  
  void AddIcon(); >cEc##:5  
  UINT nCount; ]w.:K*_=  
  void SaveBmp(); ps1ndGp~#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor :B?XNo  
  // Dialog Data oR>o/$z$)g  
  //{{AFX_DATA(CCaptureDlg) ,.tv#j|A  
  enum { IDD = IDD_CAPTURE_DIALOG }; F23/|q{{  
  CComboBox m_Key; ooY2"\o  
  BOOL m_bControl; TQDb\d8,f  
  BOOL m_bAlt; [H-,zY  
  BOOL m_bShift; QLYb>8?"C  
  CString m_Path; bE _=L=NG  
  CString m_Number; iva&W  
  //}}AFX_DATA W8j)2nKD  
  // ClassWizard generated virtual function overrides 5;5;bBo~  
  //{{AFX_VIRTUAL(CCaptureDlg) mAh0xgm  
 public: %pmowo~{  
  virtual BOOL PreTranslateMessage(MSG* pMsg); O;c;>x_dA  
 protected: Ym+k \h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |[n-H;0  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^'Wkb7L  
  //}}AFX_VIRTUAL Kl<qp7o0  
  // Implementation :9N~wd  
 protected: [@Y<:6  
  HICON m_hIcon; deSrs:.  
  // Generated message map functions 8jW{0&ox)  
  //{{AFX_MSG(CCaptureDlg) }I;A\K]  
  virtual BOOL OnInitDialog(); :Xc%_&)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Mi&,64<  
  afx_msg void OnPaint(); h(!x&kZq.  
  afx_msg HCURSOR OnQueryDragIcon(); /%Lj$]S7[4  
  virtual void OnCancel(); L@Fw;G|%'  
  afx_msg void OnAbout(); Cdl#LVqs  
  afx_msg void OnBrowse(); ; mF-y,E  
  afx_msg void OnChange(); dxbP'2~  
 //}}AFX_MSG *(@(9]B~  
 DECLARE_MESSAGE_MAP() M7BCBA  
}; `2\vDy1,j  
#endif [8AGW7_  
sJ)XoK syW  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ''S*B|:  
#include "stdafx.h" Z-;<R$  
#include "Capture.h" <@xp. Y  
#include "CaptureDlg.h" ;}{xpJ/  
#include <windowsx.h> Tct8NG  
#pragma comment(lib,"hook.lib") k L2(M6m  
#ifdef _DEBUG 'L)@tkklp  
#define new DEBUG_NEW bFk >IifN  
#undef THIS_FILE j(mbUB*  
static char THIS_FILE[] = __FILE__; | Zx  
#endif X=)Ue  
#define IDM_SHELL WM_USER+1 S(Md  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); < U`lh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q{6Bhx *>  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ss'#sPX  
class CAboutDlg : public CDialog [_6_A O(Z  
{ Ijq1ns_tx8  
 public: mw%do&e  
  CAboutDlg(); Ovh  
  // Dialog Data z?`&HU Nf  
  //{{AFX_DATA(CAboutDlg) >oi`%V  
  enum { IDD = IDD_ABOUTBOX }; {#N](yUm  
  //}}AFX_DATA #UL:#pY  
  // ClassWizard generated virtual function overrides 22S4q`j  
  //{{AFX_VIRTUAL(CAboutDlg) YG ,  
 protected: 6KPM4#61o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;$Q `JN=  
  //}}AFX_VIRTUAL bI.LE/yk  
  // Implementation K5gh7  
 protected: ^T`)ltI]V  
  //{{AFX_MSG(CAboutDlg) Xwy0dXko  
  //}}AFX_MSG =4cK9ac  
  DECLARE_MESSAGE_MAP() ?}"$[6.  
}; YL \d2  
W]MKc&R  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) XB,  2+  
{ KB49~7XjQ@  
 //{{AFX_DATA_INIT(CAboutDlg) OcQ>01Q  
 //}}AFX_DATA_INIT f<WP< !N%  
} aP^,@RrL  
i:W.,w%8  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >2l1t}"\  
{ 5Z/xY &  
 CDialog::DoDataExchange(pDX); 89T xd9X  
 //{{AFX_DATA_MAP(CAboutDlg) XB*)d 9'8  
 //}}AFX_DATA_MAP O@r%G0Jge  
} UN#XP$utY  
~pA_E!3W  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) dC8 $Ql^<  
 //{{AFX_MSG_MAP(CAboutDlg) .&dW?HS  
 // No message handlers oLK-~[p  
 //}}AFX_MSG_MAP  (`PgvBL:  
END_MESSAGE_MAP() D@ut -J(.  
]vRte!QJ;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) d2sY.L  
: CDialog(CCaptureDlg::IDD, pParent) JVbR5"+.  
{ I$!rNfrs  
 //{{AFX_DATA_INIT(CCaptureDlg) zhtNL_  
  m_bControl = FALSE; (A(7?eq  
  m_bAlt = FALSE; p>Dv&fX  
  m_bShift = FALSE; N"SFVc_2  
  m_Path = _T("c:\\"); |}N -5U  
  m_Number = _T("0 picture captured."); ZGgKCCt  
  nCount=0; Rd~-.&   
  bRegistered=FALSE; 9/3gF)I}  
  bTray=FALSE; xtW Q.  
 //}}AFX_DATA_INIT 6L[Yn?;  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 u;p.:{'  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); o))z8n?b  
} m  "'  
/H.w0fu&.S  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) L+,p#w  
{ %+gYZv-  
 CDialog::DoDataExchange(pDX); =Hplg>h)  
 //{{AFX_DATA_MAP(CCaptureDlg) AsJN~<0h  
  DDX_Control(pDX, IDC_KEY, m_Key); I3`WY-uv  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5%,5Xe4p  
  DDX_Check(pDX, IDC_ALT, m_bAlt); E~vM$$O$  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 3V ~871:-~  
  DDX_Text(pDX, IDC_PATH, m_Path); wSoIU,I  
  DDX_Text(pDX, IDC_NUMBER, m_Number); o1C1F}gxU  
 //}}AFX_DATA_MAP Ji4xor  
} Cw7 07  
h[~JCYA  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {3n|=  
//{{AFX_MSG_MAP(CCaptureDlg) JDPn   
 ON_WM_SYSCOMMAND() V45A>#?U  
 ON_WM_PAINT() 87WIDr  
 ON_WM_QUERYDRAGICON() ..BIoSrj  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  uYVlF@]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) CT5\8C  
 ON_BN_CLICKED(ID_CHANGE, OnChange) l~P%mVC3m  
//}}AFX_MSG_MAP T-e'r  
END_MESSAGE_MAP() s2=rj?g&(X  
"(bnr0  
BOOL CCaptureDlg::OnInitDialog() ;f,`T  
{ Xc"l')1H  
 CDialog::OnInitDialog(); MLwh&I9)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); i) v ]  
 ASSERT(IDM_ABOUTBOX < 0xF000); -]yM<dP  
 CMenu* pSysMenu = GetSystemMenu(FALSE); t;005]'Mp  
 if (pSysMenu != NULL) $yxwB/O(  
 { d%+oCoeb  
  CString strAboutMenu; >np!f8+d"q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); >h:rYEsh8V  
  if (!strAboutMenu.IsEmpty()) LsaE-l  
  { '5xIisP  
   pSysMenu->AppendMenu(MF_SEPARATOR); u5D@,wSNz  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); oz3N 8^M  
  } {wsO8LX  
 } )CgKZ"  
 SetIcon(m_hIcon, TRUE); // Set big icon @BQJKPF*  
 SetIcon(m_hIcon, FALSE); // Set small icon cbe&SxJ  
 m_Key.SetCurSel(0); < 12ia"}  
 RegisterHotkey(); ?VCdT`6=  
 CMenu* pMenu=GetSystemMenu(FALSE); U9w0kcUw#J  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); #r5IwyL  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (gW#T\Eln  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); wW2b?b{*Z  
 return TRUE; // return TRUE unless you set the focus to a control +/xmxh$ $  
} l~ 3H"  
)~W 35  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^`M,ju  
{ 2J?ON|2M  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) dH]0 (aJ  
 { Z;M}.'BE  
  CAboutDlg dlgAbout; Fuq MT`  
  dlgAbout.DoModal(); {qxFRi#\k  
 } ."`mh&+`  
 else >]b>gc?3  
 { sVXIR  
  CDialog::OnSysCommand(nID, lParam); 9$ GA s  
 } as#_Fer`U  
} w:[1,rRvT  
25EuVj`zL  
void CCaptureDlg::OnPaint() r 0m A  
{ m~7[fgN2  
 if (IsIconic()) MU_8bK9m  
 { i'XW)n  
  CPaintDC dc(this); // device context for painting `D *U@iJ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); _8zZ.~)  
  // Center icon in client rectangle T}fH  
  int cxIcon = GetSystemMetrics(SM_CXICON); Nf@-i`  
  int cyIcon = GetSystemMetrics(SM_CYICON); dKk\"6 o  
  CRect rect; 7 2Zp%a=  
  GetClientRect(&rect); ~>2DA$Ec  
  int x = (rect.Width() - cxIcon + 1) / 2; ? 2#tIND  
  int y = (rect.Height() - cyIcon + 1) / 2; X8(H#Ef[  
  // Draw the icon W^U6O&-K  
  dc.DrawIcon(x, y, m_hIcon); kdmmfw  
 } :Q\Es:y  
 else UXs=7H".  
 { v67utISNI  
  CDialog::OnPaint(); @:2<cn`  
 } op!ft/Yyb  
} :vsBobiJ  
F7o#KN*.]  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1#nR$  
{ o 8fB  
 return (HCURSOR) m_hIcon; XFj\H(D  
} +=_^4  
W^(:\IvV  
void CCaptureDlg::OnCancel() FE'|wf  
{ w_gFN%8  
 if(bTray) +-%&,>R  
  DeleteIcon(); VIIBw  
  CDialog::OnCancel(); YgiLfz iT  
} u/s,#  
"6^~-` O  
void CCaptureDlg::OnAbout() (w1M\yodV  
{ <[*%d~92z  
 CAboutDlg dlg; <n#phU Q  
 dlg.DoModal(); Kivr)cIG  
} |gV$ks\<  
adCTo  
void CCaptureDlg::OnBrowse() "c+j2f'f  
{ jRn5)u  
 CString str; ~ShoU m[  
 BROWSEINFO bi; )Z/L  
 char name[MAX_PATH]; hq[:U?!Tt  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); k U75  
 bi.hwndOwner=GetSafeHwnd(); rnOg;|u8  
 bi.pszDisplayName=name; ejF GeR  
 bi.lpszTitle="Select folder"; NE~R&ym9  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; HQ187IwpTm  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); n0\k(@+k  
 if(idl==NULL) r%:Q(|v?  
  return; $Gy&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); kzkrvC+u  
 str.ReleaseBuffer(); lwVo%-  
 m_Path=str; K3Sa6"U  
 if(str.GetAt(str.GetLength()-1)!='\\') S]"U(JmW\  
  m_Path+="\\"; e7O9q8b  
 UpdateData(FALSE); MbT;]Bo  
} p1BMQ?=($  
&EUI  
void CCaptureDlg::SaveBmp() d O})#50f  
{ 1QA{NAnu&  
 CDC dc; R>C^duos.  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "e-RV  
 CBitmap bm; Q  *]d[  
 int Width=GetSystemMetrics(SM_CXSCREEN); l* ap$1'  
 int Height=GetSystemMetrics(SM_CYSCREEN); Wx8oTN  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Z&Qz"V>$  
 CDC tdc; Y5/SbQYf1  
 tdc.CreateCompatibleDC(&dc); uc~/l4~N  
 CBitmap*pOld=tdc.SelectObject(&bm); {0(:5%  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )'1rZb5  
 tdc.SelectObject(pOld); 1H-d<G0)  
 BITMAP btm; n)<S5P?  
 bm.GetBitmap(&btm); ;h"St0   
 DWORD size=btm.bmWidthBytes*btm.bmHeight; B=<Z@u  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); hf`5NcnP  
 BITMAPINFOHEADER bih; VG=mA4Dd  
 bih.biBitCount=btm.bmBitsPixel; 5 LX'fL7zU  
 bih.biClrImportant=0; #^>Md59N  
 bih.biClrUsed=0; 15l{gbCW  
 bih.biCompression=0; IG(1h+5 R(  
 bih.biHeight=btm.bmHeight; pzcl@  
 bih.biPlanes=1; kq4ii`zi8  
 bih.biSize=sizeof(BITMAPINFOHEADER); 8mc0(Z@  
 bih.biSizeImage=size; dSP~R  
 bih.biWidth=btm.bmWidth; K*/X{3J;  
 bih.biXPelsPerMeter=0; c/'Cju W  
 bih.biYPelsPerMeter=0; Iq?#kV9)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); qlU"v)Mx  
 static int filecount=0; /19ZyQw9  
 CString name; ]?<=DHn  
 name.Format("pict%04d.bmp",filecount++); 6Trtulm  
 name=m_Path+name; !H^e$BA  
 BITMAPFILEHEADER bfh; T?4I\SG  
 bfh.bfReserved1=bfh.bfReserved2=0; LkwjEJQf  
 bfh.bfType=((WORD)('M'<< 8)|'B'); sX c|++  
 bfh.bfSize=54+size; h>:eu#  
 bfh.bfOffBits=54; 3UNmUDl[~  
 CFile bf; c$fYK  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ lP;X=X>  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =>m x>R`S  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~Qm<w3oy  
  bf.WriteHuge(lpData,size); 'V`Hp$r  
  bf.Close(); e h6\y7 9g  
  nCount++; v1`*}.#  
 } + t JEG:  
 GlobalFreePtr(lpData); /@O$jlX5I  
 if(nCount==1) -tH^Deo  
  m_Number.Format("%d picture captured.",nCount); GF/!@N  
 else i.5?b/l0  
  m_Number.Format("%d pictures captured.",nCount); 8q/3}AnI  
  UpdateData(FALSE); 5*hA6Ex7  
} (/[wM>q:r  
A dL>?SG%  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4Q?3gA1  
{ Pw|J([  
 if(pMsg -> message == WM_KEYDOWN) GE!fh1[[u  
 { q(s&2|  
  if(pMsg -> wParam == VK_ESCAPE) W }  
   return TRUE; -L6V)aK&  
  if(pMsg -> wParam == VK_RETURN) Q13>z%Rge  
   return TRUE; ^V?W'~  
 } 0K:3?Ik  
 return CDialog::PreTranslateMessage(pMsg); JU`5K}H<  
} 8`Iz%rw&(J  
&<Iz?AVr  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $gPR3*0  
{ ',l}$]y5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ iebnQf  
  SaveBmp(); LSlYYyt  
  return FALSE; vwIP8z~<  
} +\s&v!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ cKe{ ]a  
 CMenu pop; d+L!s7  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); QT)5-Jy  
 CMenu*pMenu=pop.GetSubMenu(0); 1=Y pNXX  
 pMenu->SetDefaultItem(ID_EXITICON); Z[%vO?,  
 CPoint pt; wqE+hKs,  
 GetCursorPos(&pt); _!C M  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (> VD#n  
 if(id==ID_EXITICON) x*a^msY%  
  DeleteIcon(); 7\<}378/^  
 else if(id==ID_EXIT) HlgkW&}c^  
  OnCancel(); @3Nvf}He  
 return FALSE; Y q(CD!  
} V6a+VfH  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); iji2gWV}h  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (!:+q$#BK  
 AddIcon(); ~fz9AhU8  
 return res; =67tQx58  
} $/|2d4O:{  
>`)IdX  
void CCaptureDlg::AddIcon() Xo/0lT  
{ 'FC#O%l  
 NOTIFYICONDATA data; BW{&A&j  
 data.cbSize=sizeof(NOTIFYICONDATA); Uy;e5<<  
 CString tip; U%4 s@{7  
 tip.LoadString(IDS_ICONTIP); ATkx_1]KM-  
 data.hIcon=GetIcon(0); )9~-^V0A^>  
 data.hWnd=GetSafeHwnd(); t_NnQ4)=  
 strcpy(data.szTip,tip); vE$n0bL2  
 data.uCallbackMessage=IDM_SHELL; >pj)va[Q  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; iT,Ya-9"  
 data.uID=98; =&x u"V  
 Shell_NotifyIcon(NIM_ADD,&data); met`f0jw  
 ShowWindow(SW_HIDE); 0~=>:^H'`q  
 bTray=TRUE; JL:\\JT.  
} ,k+F8{Q.  
QQW]j;'~  
void CCaptureDlg::DeleteIcon() oeF0t'%  
{ ~Blsj9a2  
 NOTIFYICONDATA data; }:xj%?ki  
 data.cbSize=sizeof(NOTIFYICONDATA); x2$Y"b?vz  
 data.hWnd=GetSafeHwnd(); MgrJ ;?L  
 data.uID=98; B nu5\P  
 Shell_NotifyIcon(NIM_DELETE,&data); 5169E*  
 ShowWindow(SW_SHOW); ;Sw % t(@  
 SetForegroundWindow(); >>R,P Ow-  
 ShowWindow(SW_SHOWNORMAL); a8v9j3.  
 bTray=FALSE; f6U i~  
} a F5=k: k  
vI5'npM  
void CCaptureDlg::OnChange() Y:KIaYkk  
{ %C =?Xhnv  
 RegisterHotkey(); /PTk296@  
} =BVBCh  
} U_z XuUz  
BOOL CCaptureDlg::RegisterHotkey() NKRI|'Y,  
{ AEO7I f@  
 UpdateData(); .EdQ]c-E=  
 UCHAR mask=0; >O/1Lpl.3  
 UCHAR key=0; %P HYJc  
 if(m_bControl) %?i~`0-:n%  
  mask|=4; BU=;rz!;  
 if(m_bAlt) Z O\x|E!b  
  mask|=2; ~ "stI   
 if(m_bShift) ]Z=O+7(r  
  mask|=1; ! ~3zp L  
  key=Key_Table[m_Key.GetCurSel()]; g$9EI\a  
 if(bRegistered){ )Nkf'&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); XyrQJ}WR|  
  bRegistered=FALSE; i=aK ?^+  
 } xk@fBa }  
 cMask=mask; |>!tqgq  
 cKey=key; &eY&6I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6  5>}Q.p  
 return bRegistered; I6.}r2?;A  
} -0:Equ?pz  
Eq/oq\(/6  
  四、小结 Tt+E?C%Y  
[z> Ya-uz7  
  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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