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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: ha&2V=  
  / p}^ Tpu  
  一、实现方法 vu Vcv  
H}Z\r2  
  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: W!MO }0s  
%L,mj  
#pragma data_seg("shareddata") B}Qpqa=_c  
HHOOK hHook =NULL; //钩子句柄 BUvE~l.,|  
UINT nHookCount =0; //挂接的程序数目 q &]I  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 t4X:I&l-M:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 8 6y)+h`  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _=S 4H  
static int KeyCount =0; ?H3Ls~R  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 D;*P'%_Z  
#pragma data_seg() +`'=K ;{U  
2 ,RO  
  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。 bVO{,P2 o  
`v) :|Q  
  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: B~xT:r  
js^+{~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Ti:PKpc  
cKey,UCHAR cMask) K8,Q^!5]"  
{ .ww~'5b0  
 BOOL bAdded=FALSE; :|%k*z  
 for(int index=0;index<MAX_KEY;index++){ %zsY=qT  
  if(hCallWnd[index]==0){ @A?Ss8p'  
   hCallWnd[index]=hWnd; c%tb6@C  
   HotKey[index]=cKey; % s&l^&ux  
   HotKeyMask[index]=cMask; N/CL?Z>c  
   bAdded=TRUE; h0ml#A`h  
   KeyCount++; U|yXJ.Z3  
   break; vM5yiHI(jb  
  } F8Y_L\q  
 } +J [<zxh\  
 return bAdded; dPvRbwH<  
} M5\$+Tu  
//删除热键 'ONCz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _ x8gEK8  
{ g4z*6L,u  
 BOOL bRemoved=FALSE; \7]0vG  
 for(int index=0;index<MAX_KEY;index++){ 0;6eSmF  
  if(hCallWnd[index]==hWnd){ !79eF)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -9)H [}.  
    hCallWnd[index]=NULL; :Q]P=-Y8  
    HotKey[index]=0; >x'R7z23  
    HotKeyMask[index]=0; l|{q8i#4V  
    bRemoved=TRUE; X3mHg5zt  
    KeyCount--; IPHZ~'M  
    break; ,y5,+:Y ~  
   } P-]u&m/6  
  } bSJ@ 5qS  
 } ,#?iu?i/  
 return bRemoved; [0>I6Jl  
} Z/G`8|A  
8=kIN-l_  
#X 1 GL  
  DLL中的钩子函数如下: 2;2FyKF(  
Iy[TEB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) h$`zuz  
{ 05SK$ Y<<  
 BOOL bProcessed=FALSE; h[*:\P`  
 if(HC_ACTION==nCode) q# C;iK4  
 { %7}ibz4iF  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ?2q4dx 0  
   switch(wParam) >8;EeRvI  
   {  >>nOS]UL  
    case VK_MENU: JiN>sEAM  
     MaskBits&=~ALTBIT; CqFk(Td9-D  
     break; H"5=z7w  
    case VK_CONTROL: ^ L?2y/  
     MaskBits&=~CTRLBIT; &d sXK~9M>  
     break; KATu7)e&~^  
    case VK_SHIFT: oU`{6 ~;  
     MaskBits&=~SHIFTBIT; 2p|ed=ly%  
     break; (pv6V2i  
    default: //judge the key and send message }z,f8Yz  
     break; ,azBk`$iQr  
   } e|1.-P@  
   for(int index=0;index<MAX_KEY;index++){ Ah :d2*SR4  
    if(hCallWnd[index]==NULL) [ikW3 '99,  
     continue; yt+d f0l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M4}b l h#  
    { 5do49H_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $Cnv]1%  
     bProcessed=TRUE; .(g"(fgF  
    } ]L6[ vJHx  
   } 4ux^K:z  
  } }kZ)|/]kn  
  else if((lParam&0xc000ffff)==1){ //有键按下 3Z_\.Z1R@  
   switch(wParam) ssY5g !%  
   { |\BxKwS^  
    case VK_MENU: JavSR1_  
     MaskBits|=ALTBIT; N!lQ;o'  
     break; Wj I NY  
    case VK_CONTROL: s:zz 8oN  
     MaskBits|=CTRLBIT; 5}Z_A?gy  
     break; 6<SX%Bc~  
    case VK_SHIFT: 2 Q}^<^r  
     MaskBits|=SHIFTBIT; '5etZ!:  
     break; 1fMl8[!JLu  
    default: //judge the key and send message XMlcY;W  
     break; b|Sjh;  
   } ?v,4seRuz  
   for(int index=0;index<MAX_KEY;index++){ S;tv4JY  
    if(hCallWnd[index]==NULL) lvp8{]I<  
     continue; >Q#\X=a>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zvOSQxGQ  
    { + 'V ,z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $N/"c$50,  
     bProcessed=TRUE; ]k)h<)nY  
    } v43FU3  
   } (|dN6M-.K  
  } \5DOp-2  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  ovsI2  
   for(int index=0;index<MAX_KEY;index++){ K<E|29t^k  
    if(hCallWnd[index]==NULL) -'Oq.$Qq  
     continue; N$! Vm(S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z8JdA%YBM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  j|owU  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 \O=t5yS  
   } 1X-fiQJe  
  } @+&QNI06S  
 } C ^ 1;r9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <IwfiI3y  
}  % Z-B{I(  
|5g1D^b]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: o 2_mcJ  
"t&_!Rm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iM_Zn!|@\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :O9i:Xq[QW  
9B9:lR  
  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: 'Ivr =-  
d9pZg=$8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) tdi^e;:?  
{ n-x%<j(Xf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 7-j=he/  
 { Om5+j:YM  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #,;X2%c  
  SaveBmp(); #xNXCBl]O  
  return FALSE; \9%RY]TK3  
 } ICm/9Onh&  
 …… //其它处理及默认处理 `KHP?lX  
} JXAH/N& i  
(( {4)5}  
XAb-K?)   
  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。 \[Q*d  
|m>{< :  
  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。 0u=FlQ }h  
k|; [)gE  
  二、编程步骤 o l8|  
Rdl^-\BV  
  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"; dW9Ci"~v  
g1(`a`M  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~T:L0||.%9  
fBZR  
  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; A5kz(pj  
'D[g{LkL  
  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; tWa_-Un3  
0Q5fX}  
  5、 添加代码,编译运行程序。 SwdUElEp  
s\io9'Ec  
三、程序代码 &? z6f9*$  
p^X \~Yibs  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 2 `nOYK  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) -J(93@X 9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 'Ej&zh  
#if _MSC_VER > 1000 bFwc>  
#pragma once G21cJi*  
#endif // _MSC_VER > 1000 7yFV.#K3O  
#ifndef __AFXWIN_H__ .?LP$O=  
#error include 'stdafx.h' before including this file for PCH F8OE  
#endif 1zWEK]2.R  
#include "resource.h" // main symbols We:b1sZR  
class CHookApp : public CWinApp -=VGXd  
{ tY0C& u2  
 public: e>Q_&6L  
  CHookApp(); b^C2<'  
  // Overrides 'G8.)eTA'  
  // ClassWizard generated virtual function overrides cRS2v--\-  
  //{{AFX_VIRTUAL(CHookApp) B^lm'/,@  
 public: (C60HbL  
  virtual BOOL InitInstance(); Hi Pd|D  
  virtual int ExitInstance(); 'bx$}w N  
  //}}AFX_VIRTUAL D&nVkZP>  
  //{{AFX_MSG(CHookApp) K [M[0D  
  // NOTE - the ClassWizard will add and remove member functions here. G;yh$n<"  
  // DO NOT EDIT what you see in these blocks of generated code ! +/Qgl  
  //}}AFX_MSG ?0hEd9TU  
  DECLARE_MESSAGE_MAP() Fpckb18}(O  
}; +lED6 ]+%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); k \V6 q9*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W>T6Wlxu`6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *WK0dn  
BOOL InitHotkey(); pipqXe  
BOOL UnInit(); $|n#L6k  
#endif +9[s(E?SY  
" twq#Alx  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. \K%A}gnHe  
#include "stdafx.h"  >q^l  
#include "hook.h" vY'E+M"+@  
#include <windowsx.h> D/Hob  
#ifdef _DEBUG |n q}#  
#define new DEBUG_NEW V>:ubl8j0l  
#undef THIS_FILE ]}HuK#  
static char THIS_FILE[] = __FILE__; mrId`<L5l{  
#endif Y=tx kN  
#define MAX_KEY 100 U]W+ers  
#define CTRLBIT 0x04 5,u'p8}.  
#define ALTBIT 0x02 ~|.vz!A  
#define SHIFTBIT 0x01 $Oi@B)=4d+  
#pragma data_seg("shareddata") 0MX``/Z72  
HHOOK hHook =NULL; XfYhLE  
UINT nHookCount =0; u!DAeE  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 6%t>T~x  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT eZk4 $y  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 3PgiV%]  
static int KeyCount =0; zD%@3NA41  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift t%Hy#z1W_  
#pragma data_seg() oRQJ YH  
HINSTANCE hins;  b@m\ca  
void VerifyWindow(); KL4vr|i,  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) t8\XO j  
//{{AFX_MSG_MAP(CHookApp) U6 $)e.FO  
// NOTE - the ClassWizard will add and remove mapping macros here. /4lm=ZE/  
// DO NOT EDIT what you see in these blocks of generated code! 9>1Gj-S2:  
//}}AFX_MSG_MAP 5*IfI+}  
END_MESSAGE_MAP() yx&'W_Q@  
`D9AtN] R  
CHookApp::CHookApp() ^*A8 NdaB  
{ rA6lyzJ  
 // TODO: add construction code here, A0`#n|(Ad!  
 // Place all significant initialization in InitInstance }J-+^  
} w|0w<K  
c037#&Q%#  
CHookApp theApp; )%D>U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |)WN%#v  
{ 76j5  
 BOOL bProcessed=FALSE; FatLc|[  
 if(HC_ACTION==nCode) +`s%-}-r  
 { QGM@m:O  
  if((lParam&0xc0000000)==0xc0000000){// Key up P_8z'pYd>  
   switch(wParam) R1lC_G]  
   { YNV4'  
    case VK_MENU: "JJEF2e@Z  
     MaskBits&=~ALTBIT; @EV*QC2l;Y  
     break; 2!E@Gbhm5  
    case VK_CONTROL: `am]&0g^+(  
     MaskBits&=~CTRLBIT; f!n0kXVu6U  
     break; *D6X&Hg&5  
    case VK_SHIFT: 5}" @$.{i  
     MaskBits&=~SHIFTBIT;  Q  
     break; 5y%-K=d  
    default: //judge the key and send message i>}aQ:&^0  
     break; 8,m3]Lg  
   } :d,]BB  
   for(int index=0;index<MAX_KEY;index++){ JLFZy\  
    if(hCallWnd[index]==NULL) !&b wFO>P  
     continue; .,$<waGD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) { i2QLS  
    { jDwLzvM O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3HI- G.]hC  
     bProcessed=TRUE; 02F[4c~  
    } UoSzxL  
   } c>3AR17+5  
  } F#^<t$5t  
  else if((lParam&0xc000ffff)==1){ //Key down Y&JK*d  
   switch(wParam) n13#}i {tm  
   { "x P2GZ  
    case VK_MENU: wSwDhOX=  
     MaskBits|=ALTBIT; YN>k5\M_v  
     break; P/hV{@x  
    case VK_CONTROL: -=)Al^V4T  
     MaskBits|=CTRLBIT; qPI1\!z6  
     break; h.ln%6:d  
    case VK_SHIFT: [;n/|/m,  
     MaskBits|=SHIFTBIT; r(Vz(  
     break; m}oqs0xx  
    default: //judge the key and send message xG|T_|?  
     break; J jp)%c#_  
   } yv2N5IQ>{V  
   for(int index=0;index<MAX_KEY;index++) quGv q"Y>  
   { ejjL>'G/|%  
    if(hCallWnd[index]==NULL) -xk.wWpV  
     continue; |1[3RnG S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UBZ37P  
    { ?!Bf# "TY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6+s10?  
     bProcessed=TRUE; wTw)GV4  
    } <*'%Xgm  
   } $wBF'|eU  
  } *~>} *  
  if(!bProcessed){ Ub_!~tb}?  
   for(int index=0;index<MAX_KEY;index++){ ].e4a;pt  
    if(hCallWnd[index]==NULL) 9z0G0QW[  
     continue; 7u|X . X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Z|k>)pv@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); h]{V/  
   } O"6 (k{`  
  } i3[%]_eP.  
 } C ks;f6G  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); tW)K pX  
} ;)'@kzi  
:U!@  
BOOL InitHotkey() B2/d%B  
{ Q2(K+!Oe  
 if(hHook!=NULL){ yJRqX]MLA  
  nHookCount++; 6#SUfK;  
  return TRUE; xB<^ar  
 } q<Sb>M/\,  
 else `EJ.L6j$'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); qjrl$[`X:  
  if(hHook!=NULL) CNkI9>L=W`  
   nHookCount++; 2f8\Osn>m  
  return (hHook!=NULL); KyQd6 1  
} BD.>aAi!  
BOOL UnInit() Q%*987i  
{ %&[=%zc  
 if(nHookCount>1){ #PJHwvr  
  nHookCount--; tP0\;W  
  return TRUE; E'ay @YAp  
 } HZJ)q`1E  
 BOOL unhooked = UnhookWindowsHookEx(hHook); %UXmWXF4$  
 if(unhooked==TRUE){ P]mJ01@'  
  nHookCount=0; TEN~3 Ef#  
  hHook=NULL; gL(_!mcwu  
 } LjEG1$F>  
 return unhooked; |T)  $E  
} FO S5?%J  
MX )mm^A  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;b6h/*;'  
{ u"s@eN  
 BOOL bAdded=FALSE; 92 oUQ EK  
 for(int index=0;index<MAX_KEY;index++){  gmW-#.  
  if(hCallWnd[index]==0){ 3[Xc:;+/  
   hCallWnd[index]=hWnd; 7]`l"=/z  
   HotKey[index]=cKey; bCL/"OB  
   HotKeyMask[index]=cMask; s,;7m  
   bAdded=TRUE; 089 <B& <  
   KeyCount++; ]p-x ds#d  
   break; /a7N:Z_Bz  
  } =v:}{~M^$  
 } 2K VX  
 return bAdded; o^8Z cN>  
} vBLs88  
/Y#Q<=X  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `37%|e3bQ  
{ B{ hV|2  
 BOOL bRemoved=FALSE; ]VcuD05"C  
 for(int index=0;index<MAX_KEY;index++){ l&Cy K#B:\  
  if(hCallWnd[index]==hWnd){ F(DM$5z[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]]eI80u[  
    hCallWnd[index]=NULL; |QHIB?C?`  
    HotKey[index]=0; \`oP\|Z  
    HotKeyMask[index]=0; s/\<;g:u^  
    bRemoved=TRUE; me+u"G9I;  
    KeyCount--; 8mM`v  
    break; &WJ;s*  
   } m8,jVR  
  } wvcj*{7[  
 } > Hwf/Gf[  
 return bRemoved; Z/e^G f#i  
} %$6?em_  
cES8%UC^i  
void VerifyWindow() EL^j}P  
{ Ov~vK\  
 for(int i=0;i<MAX_KEY;i++){ "UUoT  
  if(hCallWnd!=NULL){ +|6E~#zklY  
   if(!IsWindow(hCallWnd)){ }Dx5W9Ri"  
    hCallWnd=NULL; fJK;[*&Y  
    HotKey=0; #9rCF 3P  
    HotKeyMask=0; #B6$ r/%  
    KeyCount--; 8'-E>+L   
   } ql I1<Jx  
  } pqDlg  
 } f7?u`"C  
} [5;_XMj%  
Pah*,  
BOOL CHookApp::InitInstance() otmyI;v 7<  
{ qS/ 'Kyp_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4Dw| I${O  
 hins=AfxGetInstanceHandle(); orZwm9#].  
 InitHotkey(); 08_<G`r  
 return CWinApp::InitInstance(); X- P%^mK  
} R@ MXwP  
L~!Lq4]V\g  
int CHookApp::ExitInstance() 0 } |21YED  
{ (YY!e2  
 VerifyWindow(); MZ%S3'  
 UnInit(); %4x,^ K]  
 return CWinApp::ExitInstance(); '-V[t yE  
} l9+)h }  
P/[}$(&:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xA>3]<O  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;%mdSaf  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }*|aVBvU  
#if _MSC_VER > 1000 ZK`x(h{p)  
#pragma once L.x`Jpq(3  
#endif // _MSC_VER > 1000 + %H2;8{F  
:v%iF!+.P  
class CCaptureDlg : public CDialog Q94p*]W"  
{ V;(Rg=5  
 // Construction |]'gd)%S\  
 public: H><! C  
  BOOL bTray; 6Tg'9|g  
  BOOL bRegistered; hY/i)T{  
  BOOL RegisterHotkey(); !|-:"hE1h  
  UCHAR cKey; g+QNIM>  
  UCHAR cMask; J:dNV <A^  
  void DeleteIcon(); b8h6fB:2  
  void AddIcon(); M5`wfF,j  
  UINT nCount; iUk#0 I  
  void SaveBmp(); "Xj>dB1~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor *n`8 -=  
  // Dialog Data CA3`Ee+rD  
  //{{AFX_DATA(CCaptureDlg) 6#Bg99c  
  enum { IDD = IDD_CAPTURE_DIALOG }; tg;AF<VI  
  CComboBox m_Key; 7 aN}l QM  
  BOOL m_bControl; 1Ba.'~:  
  BOOL m_bAlt; w -5_Ru  
  BOOL m_bShift; Qy\K oo  
  CString m_Path; t]6 4=  
  CString m_Number; )%bY2 pk  
  //}}AFX_DATA 6BObV/S Jg  
  // ClassWizard generated virtual function overrides bj=YFV+  
  //{{AFX_VIRTUAL(CCaptureDlg) %iD'2e:  
 public:  V/t-  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *?!A  
 protected: 6D29s]h2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *W<|5<<u@  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); #IxCI)!I{[  
  //}}AFX_VIRTUAL $`txU5#vs  
  // Implementation [p96H)8YU  
 protected: }^ZPah  
  HICON m_hIcon; 2rqYm6  
  // Generated message map functions Y4)=D@JI  
  //{{AFX_MSG(CCaptureDlg) 2^fSC`!  
  virtual BOOL OnInitDialog(); u<nPJeE  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); p 4Y 2AQ9  
  afx_msg void OnPaint(); to3D#9Ep  
  afx_msg HCURSOR OnQueryDragIcon(); c59l/qoz  
  virtual void OnCancel(); d~w}{LR[1  
  afx_msg void OnAbout(); vL Qh r&I  
  afx_msg void OnBrowse(); R|K#nh  
  afx_msg void OnChange(); ''wF%q  
 //}}AFX_MSG ;op 8r u  
 DECLARE_MESSAGE_MAP() +\~Mx>Cn  
}; +$D~?sk  
#endif f/]g@/`  
+"D*0gYD  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |^t8ct?x~  
#include "stdafx.h" T0lbMp  
#include "Capture.h" Z$ 6yB  
#include "CaptureDlg.h" H:`[$ ^  
#include <windowsx.h> E{E%nXR)  
#pragma comment(lib,"hook.lib") K*oWcsu  
#ifdef _DEBUG &+7G|4!y  
#define new DEBUG_NEW J@Qw6J  
#undef THIS_FILE psAdYEGk!  
static char THIS_FILE[] = __FILE__; yWZ%|K~$  
#endif qb$f,E[  
#define IDM_SHELL WM_USER+1 j~`rc2n%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =@go;,"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KHt.g`1:R  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; `+EjmY  
class CAboutDlg : public CDialog pYaq1_<+  
{ YJ~3eZQ  
 public: qJLtqv  
  CAboutDlg(); pax;#*QcQ  
  // Dialog Data qY%{c-aMA  
  //{{AFX_DATA(CAboutDlg) TkV*^j5  
  enum { IDD = IDD_ABOUTBOX }; e"6!0Py#*  
  //}}AFX_DATA \&5t@sC  
  // ClassWizard generated virtual function overrides CDgu`jj%]  
  //{{AFX_VIRTUAL(CAboutDlg) x)!NB99(tC  
 protected: s9b 6l,Z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ypsT: uLT  
  //}}AFX_VIRTUAL #ZPy&GIr  
  // Implementation or..e  
 protected: O;~d ao  
  //{{AFX_MSG(CAboutDlg) Pdw[#X<[`  
  //}}AFX_MSG 9Sk?tl  
  DECLARE_MESSAGE_MAP() -<.b3Mh  
}; 'U3+'du^8  
pTk1iGfB  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :{KoZd  
{ i;8tA !  
 //{{AFX_DATA_INIT(CAboutDlg) )gP0+W!u  
 //}}AFX_DATA_INIT ^PI8Bvs>j  
} Hm55R  
[G[|auKF  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XhxCOpO  
{ ay,E!G&H  
 CDialog::DoDataExchange(pDX); s7}46\/U  
 //{{AFX_DATA_MAP(CAboutDlg) -P|st;?#  
 //}}AFX_DATA_MAP 6zJfsKf$  
} -VlXZj@u+  
L/n?1'he  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2q ,> *B?  
 //{{AFX_MSG_MAP(CAboutDlg) #iAEcC0k5  
 // No message handlers Wf>scl `s  
 //}}AFX_MSG_MAP o$_,2$>mn  
END_MESSAGE_MAP() TEi~X 2u  
]M5w!O!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Q`7.-di  
: CDialog(CCaptureDlg::IDD, pParent) ?O<D&CvB  
{ [Oy5Td7[  
 //{{AFX_DATA_INIT(CCaptureDlg) &p#$}tm  
  m_bControl = FALSE; 1C' _I  
  m_bAlt = FALSE; Z/hgr|&}  
  m_bShift = FALSE; +nT(>RJR  
  m_Path = _T("c:\\"); O5eTkKUc  
  m_Number = _T("0 picture captured."); b 6B5  
  nCount=0; XUp'wP  
  bRegistered=FALSE; zVU{jmS  
  bTray=FALSE; {*J{1)2  
 //}}AFX_DATA_INIT D!d1%hac  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 `c~J&@|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;VAHgIpx;  
} zwa%$U  
K6l{wyMb|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~t-!{F  
{  *c6o#[l  
 CDialog::DoDataExchange(pDX); eAD uk!Iq  
 //{{AFX_DATA_MAP(CCaptureDlg) j"c30AY  
  DDX_Control(pDX, IDC_KEY, m_Key); @?r[ $Ea1M  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); l4+Bs!i`  
  DDX_Check(pDX, IDC_ALT, m_bAlt); mE}@}@(  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ^N\$oV$  
  DDX_Text(pDX, IDC_PATH, m_Path); a{FCg%vD)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Gn8'h TM  
 //}}AFX_DATA_MAP 1||\3L/  
} mjtmN0^SR  
_rU%DL?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) kg^VzNX  
//{{AFX_MSG_MAP(CCaptureDlg) qu:nV"~_  
 ON_WM_SYSCOMMAND() F+3}Gkn  
 ON_WM_PAINT() Lradyo44u\  
 ON_WM_QUERYDRAGICON() .sOEqwO}>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?]]d s]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2)zAX"#/  
 ON_BN_CLICKED(ID_CHANGE, OnChange) C>:'@o Z  
//}}AFX_MSG_MAP b,Vg3BS  
END_MESSAGE_MAP() 3</gK$f2  
H${5pY_M  
BOOL CCaptureDlg::OnInitDialog() Ghb Jty`  
{ J>XMaI})U  
 CDialog::OnInitDialog(); O<o>/HH$  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %2jRJ  
 ASSERT(IDM_ABOUTBOX < 0xF000); *lT:P-  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }; ;Thfd  
 if (pSysMenu != NULL) g VPtd[r  
 { :ENdF `nC  
  CString strAboutMenu; Y3QrD&V  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 2aR<xcSg  
  if (!strAboutMenu.IsEmpty()) c?0.>^,B Q  
  { o'SZ sG  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5v`[c+@F  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (:P-ef$]C  
  } Gjh8>(  
 } <X b B;  
 SetIcon(m_hIcon, TRUE); // Set big icon mhDC1lXF  
 SetIcon(m_hIcon, FALSE); // Set small icon v{[:7]b_=  
 m_Key.SetCurSel(0); t) :'XGk@  
 RegisterHotkey(); il5Qo  
 CMenu* pMenu=GetSystemMenu(FALSE); DQy<!Wb+  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); W#.+C6/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4,]z  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {%b*4x0?  
 return TRUE; // return TRUE unless you set the focus to a control zv8AvNDK  
} [PW\l+i  
%A^V@0K3  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 15X.gx  
{ NlG~{rfI  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~]_U!r[FA  
 { ;#Y'SK  
  CAboutDlg dlgAbout; ?;0w1  
  dlgAbout.DoModal(); 7a_tT;f;  
 } j LS<S_`  
 else S 4hv7.A  
 { nR(v~_y[V  
  CDialog::OnSysCommand(nID, lParam); EIrAq!CA  
 } ~Bi>T15e  
} S[ln||{  
Qu;cl/&  
void CCaptureDlg::OnPaint() 'OTQiI^t=  
{ * ",/7(  
 if (IsIconic()) HPz3"3n!  
 { :yi?<  
  CPaintDC dc(this); // device context for painting 9-3, DxZ}  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); . \t8s0A  
  // Center icon in client rectangle rn9n_)  
  int cxIcon = GetSystemMetrics(SM_CXICON); 6^l|/\Y{  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?-Zl(uX  
  CRect rect;  J^V}%N".  
  GetClientRect(&rect); s ]XZQr%  
  int x = (rect.Width() - cxIcon + 1) / 2; / :z<+SCh  
  int y = (rect.Height() - cyIcon + 1) / 2; x=M%QFe  
  // Draw the icon 2t,N9@u=UN  
  dc.DrawIcon(x, y, m_hIcon); J{!U;r!6  
 } |Fi{]9(G2  
 else 6|G&d>G$_  
 { <%iRa$i5  
  CDialog::OnPaint(); "\k| Z  
 } JuKG#F#,  
} |W#(+m  
90[6PSXk  
HCURSOR CCaptureDlg::OnQueryDragIcon() [2$mo;E?  
{ 1p5n}|  
 return (HCURSOR) m_hIcon; DEw>f%&4  
} tP][o494\&  
B%^W$7 q  
void CCaptureDlg::OnCancel() bt{b%r  
{ Ls` [7w  
 if(bTray) 9]Fi2M  
  DeleteIcon(); 'CMbq Lk#  
  CDialog::OnCancel(); U #C@&2  
} ak A7))Q  
1PB"1.wnd  
void CCaptureDlg::OnAbout() dM=45$\q  
{ J6I:UML  
 CAboutDlg dlg; vR3\E"Zi  
 dlg.DoModal(); S54q?sb_  
} TtQ'I}7q  
({OQ JBC  
void CCaptureDlg::OnBrowse() " vka7r  
{ nSv@FT'~z  
 CString str; D"V(A\sZ  
 BROWSEINFO bi; 7tbY>U8  
 char name[MAX_PATH]; Yu$QL@  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `y|_hb  
 bi.hwndOwner=GetSafeHwnd(); Uv m:`e~?  
 bi.pszDisplayName=name; ZXIw^!8@/  
 bi.lpszTitle="Select folder"; _70Z1_ ;  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @V&c=8) 8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); g\% Z+Dc  
 if(idl==NULL) * '_(.Z:  
  return; '^.`mT'P  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9Vru,7g  
 str.ReleaseBuffer(); U4.$o ]58  
 m_Path=str; 4`B3Kt`o  
 if(str.GetAt(str.GetLength()-1)!='\\') _ a#k3r  
  m_Path+="\\"; ,v%' 2[}  
 UpdateData(FALSE); @y'0_Y0-B  
} 1Q/= s,{u  
Kh$Q9$  
void CCaptureDlg::SaveBmp() E<l/o5<nC  
{ JC MUK<CG  
 CDC dc; V3>tW,z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); h UC157  
 CBitmap bm; Nq%ir8hE  
 int Width=GetSystemMetrics(SM_CXSCREEN); eaC%& k  
 int Height=GetSystemMetrics(SM_CYSCREEN); #;yxn.</  
 bm.CreateCompatibleBitmap(&dc,Width,Height); K9{RU4<  
 CDC tdc; oY4^CGk=  
 tdc.CreateCompatibleDC(&dc); yeI> b 1>Q  
 CBitmap*pOld=tdc.SelectObject(&bm); >UQY3C  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )ViBH\.*p  
 tdc.SelectObject(pOld); 9=mc3m:Tb(  
 BITMAP btm; 1<tJ3>Xl  
 bm.GetBitmap(&btm); i!x>)E  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; P8(hHuO  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^Z-oO#)h#  
 BITMAPINFOHEADER bih; uzI=.j  
 bih.biBitCount=btm.bmBitsPixel; u"uL,w 1-  
 bih.biClrImportant=0; (3"N~\9m  
 bih.biClrUsed=0; 57~y 7/0  
 bih.biCompression=0; gBky ZK  
 bih.biHeight=btm.bmHeight; .g3=L  
 bih.biPlanes=1; <iA\ZS:  
 bih.biSize=sizeof(BITMAPINFOHEADER); %q}[ZD/HD  
 bih.biSizeImage=size; /w1M%10   
 bih.biWidth=btm.bmWidth; E.Q]X]q  
 bih.biXPelsPerMeter=0; |AH>EXhv  
 bih.biYPelsPerMeter=0; :KgH7s}  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); DXo]O}VF  
 static int filecount=0; f S[-K?K  
 CString name; =ecLzk"+F  
 name.Format("pict%04d.bmp",filecount++); |r*)U(c`  
 name=m_Path+name; ae2Q^yLA  
 BITMAPFILEHEADER bfh; lYTQg~aPm  
 bfh.bfReserved1=bfh.bfReserved2=0; d[>HxPwo  
 bfh.bfType=((WORD)('M'<< 8)|'B'); [~u&#!*W  
 bfh.bfSize=54+size; f4 qVUU  
 bfh.bfOffBits=54; zXM,cV/s   
 CFile bf; ?G5,}%  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ `% QvCAR  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -72EXO=|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1~'jC8&J  
  bf.WriteHuge(lpData,size); 9vz\R-un  
  bf.Close(); 4-t^?T: qF  
  nCount++; 5f{P% x(  
 } {#ynN`tLyF  
 GlobalFreePtr(lpData); >{N}UNZ$}  
 if(nCount==1) jQ,Vs=*H  
  m_Number.Format("%d picture captured.",nCount); Kxch.$hc,  
 else V"Z8-u  
  m_Number.Format("%d pictures captured.",nCount); n m<?oI*\  
  UpdateData(FALSE); =gs-#\%  
} (-g*U#   
1$8@CT^m  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Z2gWa~dBC  
{ d\ 8v VZ  
 if(pMsg -> message == WM_KEYDOWN) W&=OtN U!  
 { UrHndnqM  
  if(pMsg -> wParam == VK_ESCAPE) +ID\u <?  
   return TRUE; [lg!*  
  if(pMsg -> wParam == VK_RETURN) vjq2(I)u  
   return TRUE; ]q.%_  
 } -?-XO<I  
 return CDialog::PreTranslateMessage(pMsg); h7 E~I J  
} g"Y _!)X  
<(q(5jG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  ]'`E  
{ PR Mg6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &s='$a; 4  
  SaveBmp(); UWF \Vx*)b  
  return FALSE; [Q0V5P~Q'  
} yo=L1; H  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {u/1ph-  
 CMenu pop; Y@`uBB[  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); U fyhd  
 CMenu*pMenu=pop.GetSubMenu(0); 6,A|9UX=`  
 pMenu->SetDefaultItem(ID_EXITICON); F?|Efpzow?  
 CPoint pt; *m}8L%<HT  
 GetCursorPos(&pt); X>Vc4n<}  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =w! ik9  
 if(id==ID_EXITICON) ~x^y5[5{  
  DeleteIcon(); Wk<fNHg  
 else if(id==ID_EXIT) u0h%4f!X  
  OnCancel(); Td'Mc-/  
 return FALSE; RbX9PF"|+  
} )"S%'myj  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); I@MG ?ZQ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) uhh7Ft#H  
 AddIcon(); *qwN9b/!  
 return res; Qz,2PO  
} c1"wS*u  
&h0LWPl  
void CCaptureDlg::AddIcon() -;7xUNQ  
{ kU[hB1D5  
 NOTIFYICONDATA data; F#gA2VCm  
 data.cbSize=sizeof(NOTIFYICONDATA); l!f_ +lv  
 CString tip; Qds<j{2  
 tip.LoadString(IDS_ICONTIP); ->rqr#  
 data.hIcon=GetIcon(0); {5~h   
 data.hWnd=GetSafeHwnd(); F(yR\)!C  
 strcpy(data.szTip,tip); 68XJ`/d  
 data.uCallbackMessage=IDM_SHELL; c|k_[8L  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2n,z`(=  
 data.uID=98; &{V|%u}v  
 Shell_NotifyIcon(NIM_ADD,&data); gS5REC4I/  
 ShowWindow(SW_HIDE); !?nO0Ao-$  
 bTray=TRUE; Hw o _;fV  
} LUbj^iQ9  
DjM*U52Yfj  
void CCaptureDlg::DeleteIcon() sfyLG3$/  
{ NX& dJ 6a  
 NOTIFYICONDATA data; He(65ciT<O  
 data.cbSize=sizeof(NOTIFYICONDATA); Jy)=TJ!y  
 data.hWnd=GetSafeHwnd(); w'K7$F51  
 data.uID=98; CefFUqo4  
 Shell_NotifyIcon(NIM_DELETE,&data); TQ]gvi |m  
 ShowWindow(SW_SHOW); z2iMpZ  
 SetForegroundWindow(); (oG YnN,2  
 ShowWindow(SW_SHOWNORMAL); }PBme'kP  
 bTray=FALSE; ENZym  
} c!ZZMC s  
m$p}cok#+S  
void CCaptureDlg::OnChange() rLsY_7!  
{ E`o_R=%  
 RegisterHotkey(); /_0B5 ,6R  
} iT}>a30]B  
R iLl\S#  
BOOL CCaptureDlg::RegisterHotkey() '#7k9\  
{ QPVi& *8_  
 UpdateData(); ^%$IdDx  
 UCHAR mask=0; 9;+&}:IVS  
 UCHAR key=0; h$&Tg_/'#D  
 if(m_bControl) CP J21^  
  mask|=4; ;k!.ey $S  
 if(m_bAlt) SE+hB  
  mask|=2; \J+a7N8m,  
 if(m_bShift) LP"g(D2'n  
  mask|=1; UjI./"]O  
  key=Key_Table[m_Key.GetCurSel()]; b*n3Fej  
 if(bRegistered){ kG /1  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); <=NnrZOF  
  bRegistered=FALSE; _d]{[& p4t  
 } .o/|]d`%  
 cMask=mask; 93]63NY  
 cKey=key; 0`x>p6.)G  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); AkQ(V  
 return bRegistered; 46=E- Tq  
} rWTaCU^qV  
\p(S4?I7  
  四、小结 !, BJO3&  
U4"^NLAq  
  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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