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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: 6gv.n  
  2 IGAZ%%  
  一、实现方法 MkQSq MU=  
WVVqH_  
  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: +XsY*$O  
B,676~I  
#pragma data_seg("shareddata") 'uh6?2)wG  
HHOOK hHook =NULL; //钩子句柄 %!@Dop/<  
UINT nHookCount =0; //挂接的程序数目 1.+MX(w  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 W];4P=/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 VGSe<6Hh  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey G2mv6xK'  
static int KeyCount =0; a 3H S!/  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 XG0,@Ly  
#pragma data_seg() 'vXrA  
7w9) ^  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 b3Do{1BV  
*@yYqI<1a  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Kh27[@s  
PpbW+}aCF  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR SkY|.w.   
cKey,UCHAR cMask) %FwLFo^v  
{ PffRV7qU0  
 BOOL bAdded=FALSE;  @>BFhH  
 for(int index=0;index<MAX_KEY;index++){ T =:^k+  
  if(hCallWnd[index]==0){ E| No$QO)  
   hCallWnd[index]=hWnd; I)6)~[:'  
   HotKey[index]=cKey; %f@]-  
   HotKeyMask[index]=cMask; C@K@TfK!M  
   bAdded=TRUE; ,+2ytN*  
   KeyCount++; !=ZbBUJF  
   break; 46*?hA7@r(  
  } "kMpa]<c-6  
 } bH&[O`vf  
 return bAdded; IE3GM^7\  
} do G&qXw  
//删除热键 ) yjHABGJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &AW?!rH  
{ `jP6;i  
 BOOL bRemoved=FALSE; DJeG  
 for(int index=0;index<MAX_KEY;index++){ L./UgeZ  
  if(hCallWnd[index]==hWnd){ &cZD{Z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u+hzCCwtR  
    hCallWnd[index]=NULL; T\OLysc  
    HotKey[index]=0; z*:^*,  
    HotKeyMask[index]=0; |[gnWNdR$M  
    bRemoved=TRUE; TK'(\[E  
    KeyCount--; t&ngOF  
    break; E_FseR6  
   } K{ N#^L!  
  } mI}'8 .  
 } /<GygRs  
 return bRemoved; .Emw;+>  
} )5hS;u&b  
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  DLL中的钩子函数如下: .a$][Jny  
Jyvc(~x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) qV5ME #TJ  
{ ZYg="q0x&  
 BOOL bProcessed=FALSE; BVG 3 T  
 if(HC_ACTION==nCode) [~ fJ/  
 { vQztD _bX%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 HZR~r:_ i  
   switch(wParam) NX$$4<A1  
   {  \s [Uq  
    case VK_MENU: -8g ;t3z  
     MaskBits&=~ALTBIT; q W) ,)i  
     break; *2@Ne[dYEF  
    case VK_CONTROL: g!4"3Dtdg  
     MaskBits&=~CTRLBIT; 7)~/`w)P  
     break; HdLVXaD/  
    case VK_SHIFT: Kx ';mgG#$  
     MaskBits&=~SHIFTBIT; |FH/Q-7[  
     break; an.)2*u  
    default: //judge the key and send message [&6l=a  
     break; y 2&G0y  
   }  Q9{%  
   for(int index=0;index<MAX_KEY;index++){ }56"4/  Z  
    if(hCallWnd[index]==NULL) f:e~ystm  
     continue; <vOljo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wOINcEdx  
    { haS`V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v]c1|?9p'  
     bProcessed=TRUE; $$`}b^,/  
    } &%rX RP  
   } r'-)@|  
  } LDO@$jg  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?:~ `?  
   switch(wParam) wC;N*0Th  
   { u[y>DPPx  
    case VK_MENU: W +C\/  
     MaskBits|=ALTBIT; +Nyx2(g<m  
     break; PoQ@9 A  
    case VK_CONTROL: WC0@g5;1[  
     MaskBits|=CTRLBIT; v$lP?\P;}X  
     break; pz~AsF  
    case VK_SHIFT: )N<>L/R  
     MaskBits|=SHIFTBIT; g;Bq#/w  
     break; sJ25<2/  
    default: //judge the key and send message 9w(QM-u  
     break; &H<-joZ)Z\  
   } ewD61Y8-  
   for(int index=0;index<MAX_KEY;index++){ "C%;9_ig$  
    if(hCallWnd[index]==NULL) FX 0^I 0  
     continue; n~k;9`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uG~%/7Qt{  
    { 4>gk XfTF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Lr_+) l  
     bProcessed=TRUE; RR*<txdN  
    } n"$D/XJO  
   } %mg |kb6n  
  } =#SKN\4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 YB.r-c"Y  
   for(int index=0;index<MAX_KEY;index++){ Ju Kj  
    if(hCallWnd[index]==NULL) 9-I;'  
     continue; P*Uu)mG)G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) e=QnGT*b5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /\(0@To  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 {C[<7r uF  
   } mS6L6)] S  
  } OANn!nZ.  
 } #P<v[O/rA  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); JEGcZeq)  
} Wl?*AlFlk  
AS'a'x>8>,  
  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: 79z(n[^  
Xq1n1_Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 52,pCyU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wqK>=Ri_  
[-=PK\ 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: `fj(xrI  
iO(9#rV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8S &`  
{ JIQS'r  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;a*i*{\Rm  
 { H@.j@l  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 !Yz~HO,u+  
  SaveBmp(); 'cu( Sd}  
  return FALSE; .YKQ6  
 } m&EwX ^1-  
 …… //其它处理及默认处理 s-J>(|  
} -H#{[M8xX  
D/"[/!  
l!EfvqWX  
  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。 ,0[bzk  
S9t_2%e  
  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。 YR=<xn;m.  
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  二、编程步骤 p9y "0A|  
RgZBh04q  
  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"; &NL=Bd  
EL;IrtU  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; w$u=_  
}[SWt3qV1  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; %F` c Nw]  
/#GX4&z  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; JnlM0jc]`  
=;9Wh!{  
  5、 添加代码,编译运行程序。 Y7zg  
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三、程序代码 2kp.Ljt@  
MLG%+@\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "[q/2vC  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) cAogz/<S  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ z AacX@  
#if _MSC_VER > 1000 DyD#4J)E  
#pragma once MMN2X xS  
#endif // _MSC_VER > 1000 bW7tJ  
#ifndef __AFXWIN_H__ {+0]diD  
#error include 'stdafx.h' before including this file for PCH ICN>8|O`&  
#endif ;$wS<zp6  
#include "resource.h" // main symbols ) ^'Q@W  
class CHookApp : public CWinApp ! ;x  
{ fILINW{Yk)  
 public: wm}6$n?Za  
  CHookApp(); s7A{<>:  
  // Overrides k"uqso/  
  // ClassWizard generated virtual function overrides C7dy{:y`  
  //{{AFX_VIRTUAL(CHookApp) y{0`+/\`  
 public: h/ ?8F^C#v  
  virtual BOOL InitInstance(); Ia=wf"JS)  
  virtual int ExitInstance(); V<$g^Vb  
  //}}AFX_VIRTUAL Z2_eTC u  
  //{{AFX_MSG(CHookApp) ),(ejRP'r  
  // NOTE - the ClassWizard will add and remove member functions here. z | Hl*T  
  // DO NOT EDIT what you see in these blocks of generated code ! (wdE@/V  
  //}}AFX_MSG #I'W[\l~+  
  DECLARE_MESSAGE_MAP() `(vgBz`e[  
}; v7&e,:r2E@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); |"8Az0[!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lbZ,?wm  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dE7 kd=.o  
BOOL InitHotkey(); -v'7;L0K  
BOOL UnInit(); B;r U  
#endif KdHR.;*  
r :{2}nE  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9x0B9&  
#include "stdafx.h" ( \{9W  
#include "hook.h" r  /63  
#include <windowsx.h> <*3{Twa1T  
#ifdef _DEBUG ;nyV)+t+a  
#define new DEBUG_NEW d kHcG&)  
#undef THIS_FILE 0?qXDO&~  
static char THIS_FILE[] = __FILE__; 16_HO%v->  
#endif v`A^6)U#M  
#define MAX_KEY 100 @s}I_@  
#define CTRLBIT 0x04 OB)Vk  
#define ALTBIT 0x02 pk%I98! Jy  
#define SHIFTBIT 0x01 ,%w_E[2  
#pragma data_seg("shareddata") UTGR{>=>  
HHOOK hHook =NULL; OkGg4X|9  
UINT nHookCount =0; 7Vr .&`l  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey G(~d1%(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT j0B, \A  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey yv =LT~  
static int KeyCount =0; 8>RGmue  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift {mY<R`Ee  
#pragma data_seg() z6#N f,  
HINSTANCE hins; eS8tsI  
void VerifyWindow(); z9}rT<hy  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) LzB)o\a  
//{{AFX_MSG_MAP(CHookApp) =G]} L<  
// NOTE - the ClassWizard will add and remove mapping macros here. GMU.Kt  
// DO NOT EDIT what you see in these blocks of generated code! $~`a,[e<  
//}}AFX_MSG_MAP JR|yg=E  
END_MESSAGE_MAP() 1k6f|Al -  
Dq/[ g,(  
CHookApp::CHookApp() {";5n7<<)  
{  LKieOgX  
 // TODO: add construction code here, %Qgo0  
 // Place all significant initialization in InitInstance ^N#kW-i  
} }0 0mJ]H(  
7Te`#"  
CHookApp theApp; _6Wz1.]n  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HK) $ls  
{ %Rj:r!XB:  
 BOOL bProcessed=FALSE; W?mn8Y;{`  
 if(HC_ACTION==nCode) QMea2q|3$  
 { gRIRc4p  
  if((lParam&0xc0000000)==0xc0000000){// Key up izsAn"v  
   switch(wParam) lBqu}88q0  
   { \~UyfVPRT  
    case VK_MENU: 2hdi)C,7Y  
     MaskBits&=~ALTBIT; O Ul+es  
     break; N3g[,BE  
    case VK_CONTROL: _m;0%]+  
     MaskBits&=~CTRLBIT; ?`V%[~4_I  
     break; XL c&7  
    case VK_SHIFT: M>P-0IC  
     MaskBits&=~SHIFTBIT; ;ZPAnd:pb  
     break; IE.JIi^w  
    default: //judge the key and send message d!7cIYVZ  
     break; wUHuykF  
   }  Z+`mla  
   for(int index=0;index<MAX_KEY;index++){ ~z#Faed=a  
    if(hCallWnd[index]==NULL) A ^ $9[_  
     continue; aF2 eGh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #~*fZ|sq+3  
    { ';us;xR#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); I~y[8  
     bProcessed=TRUE; 3C 84b/A  
    } ,uqSq  
   } AX}l~ sv  
  } \!j{&cJ  
  else if((lParam&0xc000ffff)==1){ //Key down S9d+#6rn  
   switch(wParam) ugcWFB5|  
   { A1e|Y  
    case VK_MENU: (`x6QiG!  
     MaskBits|=ALTBIT; 6pDb5@QjTy  
     break; ZGK*]o =)  
    case VK_CONTROL: c) Zid1  
     MaskBits|=CTRLBIT; &?YbAo_K  
     break; _?#}@?  
    case VK_SHIFT: /f~ V(DK  
     MaskBits|=SHIFTBIT; | VPs5  
     break; >i7zV`eK  
    default: //judge the key and send message ]S9~2;2^,  
     break; N(q%|h<Z/=  
   } 9:"%j  
   for(int index=0;index<MAX_KEY;index++) He}qgE>Us  
   { zm4Okg)w@  
    if(hCallWnd[index]==NULL) 0^nnR7  
     continue; Z7% |'E R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~F~g$E2 }  
    { \_}Y4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Qc#<RbLL  
     bProcessed=TRUE; ?VS(W  
    } c7X5sMM,  
   } Uq `B#JI  
  } -'3~Y 2#  
  if(!bProcessed){ = zW}vm }  
   for(int index=0;index<MAX_KEY;index++){ Zm,<2BP>  
    if(hCallWnd[index]==NULL) / >c F  
     continue; 8X!^ 2B}J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 'hfQ4EN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Q4\EI=4P]  
   } QyQ&xgS  
  } hE0 p> R8  
 } &dp<i[ec^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); U1G"T(;s:  
} jR`q  y<  
Tm~a& p  
BOOL InitHotkey() ++D-,>.  
{ \L}aTCvG  
 if(hHook!=NULL){ JYA$_T  
  nHookCount++; RhIRCN9  
  return TRUE; ?ORG<11a  
 } dPgN*Bdv  
 else Jj4!O3\I  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); S"0<`{Gv  
  if(hHook!=NULL) 3<sYxA\?w  
   nHookCount++; IOmQ1X7,  
  return (hHook!=NULL); (b%&DyOt  
} 8sjAr.iT.  
BOOL UnInit() pYIm43r H  
{ VSP6osX{  
 if(nHookCount>1){ |1C=Ow*"  
  nHookCount--; IoWh&(+KdH  
  return TRUE; nylrF"'e  
 } mlc0XDS%  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Rl90uF]8  
 if(unhooked==TRUE){ tQE=c 7/M  
  nHookCount=0; 6=A   
  hHook=NULL; _]:wltPv  
 } U;p"x^U`  
 return unhooked; Lpd q^X  
} ^[6eo8Ck>  
b$\3Y'":  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3* C9;Q}  
{ c+$alw L~  
 BOOL bAdded=FALSE; O& k+;r  
 for(int index=0;index<MAX_KEY;index++){ ]pr(hk  
  if(hCallWnd[index]==0){ 5<h7+ %?t9  
   hCallWnd[index]=hWnd; `7$0H]*6  
   HotKey[index]=cKey; ~x;1&\'k  
   HotKeyMask[index]=cMask; }qU(G3  
   bAdded=TRUE; $'Z\'<k[  
   KeyCount++; l?GN& u  
   break; AX3iB1):K  
  } !\w@b`Iv8  
 } I?c "\Fe  
 return bAdded; kSj,Pl\NC  
} <yzgZXxIaS  
gE2k]`[j]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) YLs%u=e($  
{ :4RD .l  
 BOOL bRemoved=FALSE; NT+%u-  
 for(int index=0;index<MAX_KEY;index++){ |35"V3bs  
  if(hCallWnd[index]==hWnd){ a oj6/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ w/+e  
    hCallWnd[index]=NULL; 1}nrVn[B9  
    HotKey[index]=0; ~k>H4hV3  
    HotKeyMask[index]=0; ? IgM=@  
    bRemoved=TRUE; KqC8ozup  
    KeyCount--; '| (#^jAj  
    break; 8U}BSM_<2  
   } MNd8#01q`  
  } {jB& e,  
 } ajB4 Lj,:r  
 return bRemoved; ?t<yk(q  
} pJ)PVo\cV  
!9w3/Gthj  
void VerifyWindow() 8+'9K%'@qX  
{ ^W!w~g+  
 for(int i=0;i<MAX_KEY;i++){ #mu3`,9V  
  if(hCallWnd!=NULL){ 2_i/ F)W  
   if(!IsWindow(hCallWnd)){ Sh&n DdF"  
    hCallWnd=NULL; 'MZX"t  
    HotKey=0; o"h* @.  
    HotKeyMask=0; aVTTpMY  
    KeyCount--; ~2 aR>R_nT  
   } ZH6#(;b  
  } 4rkj$  
 } cb|cYCo5  
} w0W9N%f#=  
pxC:VJ;  
BOOL CHookApp::InitInstance() R%l6+Okr  
{ EG=~0j~  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <_XyHb-  
 hins=AfxGetInstanceHandle(); JG6"5::  
 InitHotkey(); cTlitf9  
 return CWinApp::InitInstance(); `-Yo$b;:  
} z*,P^K 0T  
rBNl%+ sB  
int CHookApp::ExitInstance()  ?X{ul  
{ I !\;NVhv  
 VerifyWindow(); |ci1P[y  
 UnInit(); g Mhn\  
 return CWinApp::ExitInstance(); um.s :vj$  
} .CU~wB@h  
7O)j]eeoL  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [fVtQ@-S!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) E(t:F^z&D  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ MPSoRA: h  
#if _MSC_VER > 1000 n`'v8 `a]  
#pragma once Py?EA*(d#  
#endif // _MSC_VER > 1000 VL6_in(  
lJZ-*"9V  
class CCaptureDlg : public CDialog 7,vvL8\NHu  
{ :yPA6O 4  
 // Construction VI:EjZ/|a  
 public: F"2rX&W  
  BOOL bTray; !{On_>` ,  
  BOOL bRegistered; ^)-* Ubzz  
  BOOL RegisterHotkey(); P|M#S9^]  
  UCHAR cKey; v(Vm:oK,  
  UCHAR cMask; ]<y _ =>  
  void DeleteIcon(); g$=y#<2?  
  void AddIcon(); snU $Na3  
  UINT nCount; Y"eR&d  
  void SaveBmp(); d:|(l^]{r  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor V* :Q~ ^  
  // Dialog Data DdAs]e|D[  
  //{{AFX_DATA(CCaptureDlg) gZ{q85C.>  
  enum { IDD = IDD_CAPTURE_DIALOG }; UD.&p'^ /{  
  CComboBox m_Key; wO\,?SI4  
  BOOL m_bControl; s+mNr3  
  BOOL m_bAlt; t?bc$,S"\(  
  BOOL m_bShift; y~ubH{O#  
  CString m_Path; -v]v m3Na  
  CString m_Number; F|Y}X|x8Q  
  //}}AFX_DATA <qGVOAnz+  
  // ClassWizard generated virtual function overrides ChVur{jR  
  //{{AFX_VIRTUAL(CCaptureDlg) 1rhEk|pGZ  
 public: funHznRR  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]{2Eo  
 protected: cSMiNR  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z x e6M~+  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q ERdQ~M,  
  //}}AFX_VIRTUAL QY$Z,#V)  
  // Implementation l;u_4`1H  
 protected: {3V%  
  HICON m_hIcon; ;0R|#9oX_  
  // Generated message map functions ^LaOl+;S  
  //{{AFX_MSG(CCaptureDlg) f[S$ Gu4-  
  virtual BOOL OnInitDialog(); N\ Nwmx  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); SLCV|@G  
  afx_msg void OnPaint(); pUTC~|j%:  
  afx_msg HCURSOR OnQueryDragIcon(); V%kZ-P*  
  virtual void OnCancel(); zxo0:dyw7  
  afx_msg void OnAbout(); A'jw;{8NpF  
  afx_msg void OnBrowse(); kqyV UfX$3  
  afx_msg void OnChange(); )Fa6 'M  
 //}}AFX_MSG C3m](%?   
 DECLARE_MESSAGE_MAP() >9?BJv2  
}; ez2rCpA  
#endif K/^70;/!.  
d5b \kRr  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _PI w""ssr  
#include "stdafx.h" 'Cc(}YY0C  
#include "Capture.h" K9-?7X  
#include "CaptureDlg.h" u0 & aw  
#include <windowsx.h> r$=YhI/=  
#pragma comment(lib,"hook.lib") J~\`8cds  
#ifdef _DEBUG fi/[(RBG  
#define new DEBUG_NEW @|7Ma/8v  
#undef THIS_FILE -Odk'{nW  
static char THIS_FILE[] = __FILE__; gWqO5C~h  
#endif fF~3"!1#\I  
#define IDM_SHELL WM_USER+1 E~k_4z% M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;t^8lC?>V  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oM')NIW@  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 9!aQ@ J^  
class CAboutDlg : public CDialog Ng;K-WB\  
{ >icL,n"]  
 public: "0ITW46n  
  CAboutDlg(); bU(H2Fv  
  // Dialog Data QvPG 6A]T  
  //{{AFX_DATA(CAboutDlg) OJ2O?Te8  
  enum { IDD = IDD_ABOUTBOX }; d&!ZCq#_e  
  //}}AFX_DATA m{~p(sQL  
  // ClassWizard generated virtual function overrides &s]wf  
  //{{AFX_VIRTUAL(CAboutDlg) R^nkcLFb/q  
 protected: zVSbEcr,C~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :yLSLN  
  //}}AFX_VIRTUAL )2 Omsh  
  // Implementation ^5"2s:vP  
 protected: n$z}DE5 #  
  //{{AFX_MSG(CAboutDlg) C>1fL6ct  
  //}}AFX_MSG 5)}3C_pmW  
  DECLARE_MESSAGE_MAP() )ifEgBT  
}; 81(.{Y839_  
=Wb!j18]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) '[XtARtY`  
{ ]["=K!la:  
 //{{AFX_DATA_INIT(CAboutDlg) > x$eKN  
 //}}AFX_DATA_INIT .:<-E%  
} !3E %u$-}  
gEejLyOag  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) =z=$S]qN  
{ 9`3%o9V9Y  
 CDialog::DoDataExchange(pDX); f/_RtOSw  
 //{{AFX_DATA_MAP(CAboutDlg) Z(' iZ'55F  
 //}}AFX_DATA_MAP M-  f)\`I  
} 3jH8pO^  
E0g` xf 6c  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _~^JRC[q  
 //{{AFX_MSG_MAP(CAboutDlg) |.]:#)^X?  
 // No message handlers d"7l<y5  
 //}}AFX_MSG_MAP C2 ~t  
END_MESSAGE_MAP() 6NvdFss'A{  
p4ML } q8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) sz5&P )X  
: CDialog(CCaptureDlg::IDD, pParent) > @Ux8#  
{ uk8vecj  
 //{{AFX_DATA_INIT(CCaptureDlg) c]qq *k#  
  m_bControl = FALSE; G!y~Y]e  
  m_bAlt = FALSE; kQr\ktN\  
  m_bShift = FALSE; #i#4h<R  
  m_Path = _T("c:\\"); @0XqUcV  
  m_Number = _T("0 picture captured."); k"J [mT$b  
  nCount=0; Tug}P K   
  bRegistered=FALSE; =bVaB<!  
  bTray=FALSE; DOr()X  
 //}}AFX_DATA_INIT '+!@c&d#%o  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]yTMWIx#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >&1MD}  
} q#8$@*I  
H*l2,0&W  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9M$=X-  
{ "y%S.ipWG  
 CDialog::DoDataExchange(pDX); 5#v  
 //{{AFX_DATA_MAP(CCaptureDlg) /uTU*Oe  
  DDX_Control(pDX, IDC_KEY, m_Key); B&tU~  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); fgb%SIi?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); dkz79G}e  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); GzJ("RE0)v  
  DDX_Text(pDX, IDC_PATH, m_Path); {V> >a  
  DDX_Text(pDX, IDC_NUMBER, m_Number); rv(Qz|K@  
 //}}AFX_DATA_MAP -^y$RJC  
} YQB.3  
HzW`j"\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  CB<i  
//{{AFX_MSG_MAP(CCaptureDlg) YKjm_)8]w  
 ON_WM_SYSCOMMAND() 8=]R6[,fD  
 ON_WM_PAINT() :r<uH6x|  
 ON_WM_QUERYDRAGICON() l7{Xy_66  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) l9U^[;D  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )PM&x   
 ON_BN_CLICKED(ID_CHANGE, OnChange) qRD]Q  
//}}AFX_MSG_MAP Z3ucJH/)V  
END_MESSAGE_MAP() 5LT{]&`9  
EF7Y4lp  
BOOL CCaptureDlg::OnInitDialog() \]uo^@$bm  
{ $)L=MEdx  
 CDialog::OnInitDialog(); W!$aK)]4u  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tMWDKatb  
 ASSERT(IDM_ABOUTBOX < 0xF000); \6UK:'5{  
 CMenu* pSysMenu = GetSystemMenu(FALSE); l8"  
 if (pSysMenu != NULL) R7/"ye:7J  
 { f0 ;Fokt(  
  CString strAboutMenu; yQ33JQr  
  strAboutMenu.LoadString(IDS_ABOUTBOX); a88(,:t  
  if (!strAboutMenu.IsEmpty()) 3NEbCILF  
  { -y8?"WB(b  
   pSysMenu->AppendMenu(MF_SEPARATOR); :R/szE*Ak  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `|p3@e  
  } kIHfLwh9N  
 } B&l5yI b  
 SetIcon(m_hIcon, TRUE); // Set big icon L'1p]Z"  
 SetIcon(m_hIcon, FALSE); // Set small icon s!\:%N  
 m_Key.SetCurSel(0); )G7")I J/X  
 RegisterHotkey(); x Z 3b)j2D  
 CMenu* pMenu=GetSystemMenu(FALSE); %p5%Fs`sd  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); mk)F3[ ke  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8 |2QJ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mL!)(Bb  
 return TRUE; // return TRUE unless you set the focus to a control Q4gsOx P  
} O-rHfIxY  
+doZnU,  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) -}liG  
{ &N{XLg>  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) F`l r5  
 { F,Ls1  
  CAboutDlg dlgAbout; 0]tr&BLl*  
  dlgAbout.DoModal(); ={Bcbj{  
 } MuzlUW]  
 else [m>kOv6>^  
 { eq0&8/=  
  CDialog::OnSysCommand(nID, lParam); .xR J )9q  
 } 6 ufF34tA  
} aP}kl[W  
f'hrS}e  
void CCaptureDlg::OnPaint() W'Wr8~{h  
{ 5*.JXx E;U  
 if (IsIconic()) JLS|G?#0  
 { (Rqn)<<2  
  CPaintDC dc(this); // device context for painting 3"ALohlL  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /D]?+<h1  
  // Center icon in client rectangle w1Z9@*C!  
  int cxIcon = GetSystemMetrics(SM_CXICON); $wL zaZL|  
  int cyIcon = GetSystemMetrics(SM_CYICON); >t-9yO1XQq  
  CRect rect; J2X;=X5  
  GetClientRect(&rect); LKCj@NdV  
  int x = (rect.Width() - cxIcon + 1) / 2; 6,nws5dh  
  int y = (rect.Height() - cyIcon + 1) / 2; {rQ SB;3  
  // Draw the icon n H)6mOYp  
  dc.DrawIcon(x, y, m_hIcon); <cQ)*~hN  
 } L&[uE;ro  
 else Fa}3UVm  
 { M2UF3xD   
  CDialog::OnPaint(); jf_xm=n  
 } d5/x2!mH8  
} dQD YN_  
_K(w &Kr  
HCURSOR CCaptureDlg::OnQueryDragIcon() -O.q$D=as  
{ |7$F r[2d  
 return (HCURSOR) m_hIcon; )<_e{_ h  
} '&?OhSeN  
D%L}vugxK  
void CCaptureDlg::OnCancel() ZPrL)']  
{ lTl-<E;  
 if(bTray) tI2V)i!  
  DeleteIcon(); 7 &y'\  
  CDialog::OnCancel(); D6cqON0a.  
} [ML%u$-  
oBfh1/< <a  
void CCaptureDlg::OnAbout() "bI'XaSv  
{ )%8 ;C]G;  
 CAboutDlg dlg; G}!dm0s$  
 dlg.DoModal(); #G'Y 2l  
} qmNgEz%  
,(h:0L2v7d  
void CCaptureDlg::OnBrowse() 8Z YF%  
{ KI* erK [d  
 CString str; q J)[2:.G  
 BROWSEINFO bi; ELh`|X  
 char name[MAX_PATH]; PL;PId<9w  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); [1 pWg^  
 bi.hwndOwner=GetSafeHwnd(); `a$-"tW~j  
 bi.pszDisplayName=name; drr W?U  
 bi.lpszTitle="Select folder"; JQ-O=8]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; CC Z'(Tkq  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ulY8$jB  
 if(idl==NULL) V1[Cc?o  
  return; mmE!!J`B  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); DG2CpR)S  
 str.ReleaseBuffer(); vuL;P"F4&  
 m_Path=str; VB*`"4e@b<  
 if(str.GetAt(str.GetLength()-1)!='\\') (XF"ckma  
  m_Path+="\\"; >ZAb9=/M)F  
 UpdateData(FALSE); 3em&7QM  
} uc>u=kEue  
in>Os@e#  
void CCaptureDlg::SaveBmp() s L;  
{ l* ~".q;S  
 CDC dc; P0 R8 f  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL);  t 0 $}  
 CBitmap bm; 5u\#@% \6  
 int Width=GetSystemMetrics(SM_CXSCREEN); ,;RAPT4  
 int Height=GetSystemMetrics(SM_CYSCREEN); s8i@HO  
 bm.CreateCompatibleBitmap(&dc,Width,Height); FU;b8{Y  
 CDC tdc; \6]Uj+  
 tdc.CreateCompatibleDC(&dc); --t"X<.z  
 CBitmap*pOld=tdc.SelectObject(&bm); ccUI\!TD{/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Y9YE:s  
 tdc.SelectObject(pOld); kU*Fif  
 BITMAP btm; tw<mZd2H  
 bm.GetBitmap(&btm); c34s(>AC  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [SnnOqWw  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); wrORyj  
 BITMAPINFOHEADER bih; 7/$r  
 bih.biBitCount=btm.bmBitsPixel; F 7v 1rf]  
 bih.biClrImportant=0; ~"eQPTd  
 bih.biClrUsed=0; XsOz {?G  
 bih.biCompression=0; d7g3VF<j  
 bih.biHeight=btm.bmHeight; GJpQcse%  
 bih.biPlanes=1; ]@Gw$  
 bih.biSize=sizeof(BITMAPINFOHEADER); #0;H'GO?c  
 bih.biSizeImage=size; +(a}S$C  
 bih.biWidth=btm.bmWidth; Sbf+;:D  
 bih.biXPelsPerMeter=0; UEm~5,>$0  
 bih.biYPelsPerMeter=0; xN^ngRg0  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?^y!}(  
 static int filecount=0; |j?iD  
 CString name; M/!5r  
 name.Format("pict%04d.bmp",filecount++); uA`EJ )d  
 name=m_Path+name; P4h^_*d  
 BITMAPFILEHEADER bfh; %jS#DVxBR  
 bfh.bfReserved1=bfh.bfReserved2=0; S,I|8 YE  
 bfh.bfType=((WORD)('M'<< 8)|'B'); `E@TPdu  
 bfh.bfSize=54+size; Ub>Pl,~'  
 bfh.bfOffBits=54; hxt,%al  
 CFile bf; g}uVuK;<  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ WTlR>|Zdn  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); **RW 9FU  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); bcVzl]9  
  bf.WriteHuge(lpData,size); #$W bYL|  
  bf.Close(); -#TF&-  
  nCount++; -XbO[_Wf  
 } {pzu1*  
 GlobalFreePtr(lpData); 5V"Fy&}:  
 if(nCount==1) zB/)_AW  
  m_Number.Format("%d picture captured.",nCount);  Sj,>O:p  
 else P#gY-k&Nr  
  m_Number.Format("%d pictures captured.",nCount); AK$h S M  
  UpdateData(FALSE); ~s$ jiA1  
} JPs R7f  
IJ#G/<ZJZ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) PO$ OXw  
{ )&jE<C0  
 if(pMsg -> message == WM_KEYDOWN) { \r1A  
 { 0=WZ 8|R  
  if(pMsg -> wParam == VK_ESCAPE) =1:dKo8  
   return TRUE; I;=HXL  
  if(pMsg -> wParam == VK_RETURN) 8!{;yz  
   return TRUE; 5.]eF$x2  
 } D&)w =qIu  
 return CDialog::PreTranslateMessage(pMsg); |z]O@@j$  
} Xp_3EQl  
*>=|"ff  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ".@}]z8  
{ nQ\)~MKd  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 'N7AVj  
  SaveBmp(); 7Ud  
  return FALSE; QqF&lMH  
} 9f wFSJx  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ TgDx3U[  
 CMenu pop; -pF3q2zb  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $ts%SDM  
 CMenu*pMenu=pop.GetSubMenu(0); /4Df 'd  
 pMenu->SetDefaultItem(ID_EXITICON); PkqOBU*|=  
 CPoint pt; W-72&\7  
 GetCursorPos(&pt); BAJEn6f?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *[@k=!73  
 if(id==ID_EXITICON) y*f 5_  
  DeleteIcon(); Q?1' JF!G  
 else if(id==ID_EXIT) S4'\=w #  
  OnCancel(); |Z"5zL10  
 return FALSE; r@|{mQOxa  
} CO)BF%?B  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); w^rINPAS  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) h 8ND=(  
 AddIcon(); !BQ:R(w  
 return res; )/B' ODa  
} ljS~>&  
o<J_?7c~}  
void CCaptureDlg::AddIcon() |= xK-;qs  
{ g_T[m*  
 NOTIFYICONDATA data; *.+Eg$'~V  
 data.cbSize=sizeof(NOTIFYICONDATA); t%B ,ATW  
 CString tip; yv2&K=rZp  
 tip.LoadString(IDS_ICONTIP); =}8:zO 2'{  
 data.hIcon=GetIcon(0); GfG!CG^ %  
 data.hWnd=GetSafeHwnd(); z }t{bm  
 strcpy(data.szTip,tip); F74^HQ*J  
 data.uCallbackMessage=IDM_SHELL; Wej'AR\NX  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; wM2[i  
 data.uID=98; GadZ!_.f  
 Shell_NotifyIcon(NIM_ADD,&data); s}O9[_v  
 ShowWindow(SW_HIDE); ya*KA.EGg  
 bTray=TRUE; '`+GC9VG  
} xUKn  
nc0!ag  
void CCaptureDlg::DeleteIcon() A3;}C+K  
{ jTDaW8@L  
 NOTIFYICONDATA data; 0Ud.u  
 data.cbSize=sizeof(NOTIFYICONDATA); 2#^@awJ ?  
 data.hWnd=GetSafeHwnd(); m\Xgvpv rP  
 data.uID=98; ['G@`e*\  
 Shell_NotifyIcon(NIM_DELETE,&data); F$!K/Mm[  
 ShowWindow(SW_SHOW); 9q4%s?)j  
 SetForegroundWindow(); O6P{+xj$  
 ShowWindow(SW_SHOWNORMAL); oX;D|8 f  
 bTray=FALSE; NI1jJfH|l  
} + Q $J q  
;I#f:UQ  
void CCaptureDlg::OnChange() gbl`_t/  
{ A-8[8J  
 RegisterHotkey(); Hxw 7Q?F  
} j$he5^GC  
;QiSz=DyA  
BOOL CCaptureDlg::RegisterHotkey() k9'`<82Y  
{ ^xpiNP!?a  
 UpdateData();  _xyq25/  
 UCHAR mask=0; C `>1x`n  
 UCHAR key=0; S(c&XJR  
 if(m_bControl) GJ3@".+6  
  mask|=4; BnB]]<gO"  
 if(m_bAlt) t3w:!' Ato  
  mask|=2; 5Y#W$Fx($R  
 if(m_bShift)  $O)fHD'  
  mask|=1; o-m9}pV  
  key=Key_Table[m_Key.GetCurSel()]; N N1(f  
 if(bRegistered){ V1 H3}  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5d4/}o}%"  
  bRegistered=FALSE; {FrcpcrQa  
 } %]iDhXLr  
 cMask=mask; $4&%<'l3I  
 cKey=key; c(R=f +  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); k4AF .U`I  
 return bRegistered; Pf4b/w/  
} wB~5&:]jr  
tr<iFT}C  
  四、小结 ?Ji nX'z  
qi&;2Yv  
  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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