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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: h%EeU 3  
  uU^DYgs  
  一、实现方法 KZ5%q.  
}PI:O%N;  
  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: >/n];fl>8  
8"&!3_  
#pragma data_seg("shareddata") d27q,2f!  
HHOOK hHook =NULL; //钩子句柄 f\2IKpF2  
UINT nHookCount =0; //挂接的程序数目 4kL6aSqT  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 72;'8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 %RD\Sb4YV  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey BHr,jC  
static int KeyCount =0; w'TAM"D`  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %M96 m   
#pragma data_seg() vm@V5oH  
) ^ En  
  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。 rD}g9?ut  
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  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: mOJdx-q?r  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ~9]vd|  
cKey,UCHAR cMask) X,49(-~\  
{ 5|rBb[  
 BOOL bAdded=FALSE; 9G[ DuYJI  
 for(int index=0;index<MAX_KEY;index++){ h~#iGs  
  if(hCallWnd[index]==0){ &@6xu{o  
   hCallWnd[index]=hWnd; Ll KO(Q{"  
   HotKey[index]=cKey; 4 {M   
   HotKeyMask[index]=cMask;  vm! y2  
   bAdded=TRUE; JRB6T_U  
   KeyCount++; M@T{uo  
   break; v-#,@&Uwq  
  } qxI $F  
 } ?-j/X6(\(  
 return bAdded; ^Q#_  
} %2:UsI  
//删除热键 MnD}i&k[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c+ZOC8R  
{ ?!Y_w2  
 BOOL bRemoved=FALSE; Fn5BWV  
 for(int index=0;index<MAX_KEY;index++){ z\eQB%aM  
  if(hCallWnd[index]==hWnd){ $q\"d?n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ fizW\f8ai  
    hCallWnd[index]=NULL; & R_?6*n  
    HotKey[index]=0; 9Y3"V3EZ  
    HotKeyMask[index]=0; d dgDq0N1j  
    bRemoved=TRUE; !SK`!/7c?  
    KeyCount--; X2V+cre  
    break; $2W#'_K+  
   } 76D$Nm  
  } I7_8oq\3D  
 } qIJc\,'  
 return bRemoved; 2{j$1EdI@-  
} L]MWdD  
0f5 ag&  
W/UA%We3+L  
  DLL中的钩子函数如下: &KMI C  
Lyc6nP;F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bhD-;Y!6;  
{ !Q"L)%)'A  
 BOOL bProcessed=FALSE; L ,R}l0kc  
 if(HC_ACTION==nCode) 6 ZRc|ZQ  
 { \~8W0q.4M  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 8(Az/@=n  
   switch(wParam) ~ g!!#ad  
   {  p*PzfSLN  
    case VK_MENU: ,6]ID1o:y  
     MaskBits&=~ALTBIT; YH58p&up  
     break; %fF,Fnf2  
    case VK_CONTROL: lZAGoR;0Ra  
     MaskBits&=~CTRLBIT; v(;yy{>8"  
     break; J%"5?)[z  
    case VK_SHIFT: to: ;:Goa  
     MaskBits&=~SHIFTBIT; >8/Otg+h  
     break; .iV=ybMT  
    default: //judge the key and send message %1TKgNf  
     break; c!HGiqp  
   } Ar\fA)UQ`  
   for(int index=0;index<MAX_KEY;index++){ !y$##PZ  
    if(hCallWnd[index]==NULL) oU )(/  
     continue; !%$[p'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bYLYJ`hH<R  
    { x"Ll/E)\v]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Pt85q?->  
     bProcessed=TRUE; _xAru9=n^  
    } vk|f"I  
   } B{\Y~>]Pj  
  } l1]N&jN{  
  else if((lParam&0xc000ffff)==1){ //有键按下 O`CZwXD  
   switch(wParam) S$SCW<LuN  
   { /\Nc6Z/ L  
    case VK_MENU: Vl+UC1M}B>  
     MaskBits|=ALTBIT; P]m{\K  
     break; D 6'd&U{_  
    case VK_CONTROL: Vsi:O7|+ }  
     MaskBits|=CTRLBIT; u)h {"pP  
     break; @MibKj>o  
    case VK_SHIFT: _v#pu Fy  
     MaskBits|=SHIFTBIT; egsP\ '  
     break; \ C:Gx4K  
    default: //judge the key and send message I+Fy)=DO9  
     break;  p[&J l  
   } S8qg"YR  
   for(int index=0;index<MAX_KEY;index++){ } Nn+Ny  
    if(hCallWnd[index]==NULL) 8/p ]'BLf  
     continue; ->pU!f)\X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _f 2rz+  
    { jy0aKSn8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ue3 ].:  
     bProcessed=TRUE; ,W+=N"`a'  
    } h];H]15&  
   } 9Pg6,[*u  
  } V(kK2az  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 N^B7<~ bD  
   for(int index=0;index<MAX_KEY;index++){ ;S^"Y:7)  
    if(hCallWnd[index]==NULL) \ o2oQ3  
     continue; KPy)%i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (@N ILK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,>#\aO1n  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 rbOJ;CK  
   } j8Mt"B  
  } `~\SQ EY$  
 } dlyGgaV*X  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); kT   
} *b~8`O pa`  
8r>\scS  
  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: jh z*Y}MX  
)j'Qi^;(D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )}$rgYKJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ruq;:5u  
3KqRw (BK  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: mK TF@DED  
9Znc|<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) b`%u}^B {  
{ < - sr&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Zl%)#=kO  
 { h7ZH/g$)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 kReZch}  
  SaveBmp(); 1d!s8um;  
  return FALSE; FLJ&ZU=s  
 } ~c&sr5E  
 …… //其它处理及默认处理 prM)t8SE  
} \aPH_sf,  
A%EhRAy  
\$Ky AWrZi  
  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。 tMdSdJ8  
V1P]pP  
  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。 ?$)a[UnqX  
<9H3d7%  
  二、编程步骤 Q7pCF,;  
vD2(M1Q  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; :?EZ\WM7  
Lm!]m\LRZD  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ox<6qW  
C:&Sk\   
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; wGMoh.GTh  
>~7XBb08  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 3;b)pQ~6CJ  
C&@'oLr  
  5、 添加代码,编译运行程序。 1LFad>`  
'H`:c+KDG`  
三、程序代码 yS K81`  
`tO t+>YWn  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL `B&E?x  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  [A,!3BN  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ V4u4{wU]  
#if _MSC_VER > 1000 '%_K"rb  
#pragma once [< 9%IGH  
#endif // _MSC_VER > 1000 fb0)("_V  
#ifndef __AFXWIN_H__ %qJgtu"8  
#error include 'stdafx.h' before including this file for PCH Qu/f>tJN;  
#endif _&G_SNa  
#include "resource.h" // main symbols +5-|6  
class CHookApp : public CWinApp 6f0o'  
{ A'}!'1  
 public: V@RdvQy  
  CHookApp(); _nzTd\L88  
  // Overrides X:f5t`;  
  // ClassWizard generated virtual function overrides %d-WQwJ  
  //{{AFX_VIRTUAL(CHookApp) (-1{W^(  
 public: NH5sV.vvc  
  virtual BOOL InitInstance(); \ eba9i^  
  virtual int ExitInstance(); vnf2Z,f%  
  //}}AFX_VIRTUAL w"D1mI!L 7  
  //{{AFX_MSG(CHookApp) WJ8osWdLu  
  // NOTE - the ClassWizard will add and remove member functions here. D0 q42+5  
  // DO NOT EDIT what you see in these blocks of generated code ! irw5<l  
  //}}AFX_MSG RI<s mt.Ng  
  DECLARE_MESSAGE_MAP() C:AV?  
}; wYFkGih  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); zNGUll$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }#~E-N3x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v 9G~i  
BOOL InitHotkey(); a` 9pHH:7Q  
BOOL UnInit(); Nz"K`C>/  
#endif %c$|.TkX  
`o9:6X?RA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. @ZYJY  
#include "stdafx.h" 9;n*u9<  
#include "hook.h" 1W.oRD&8j/  
#include <windowsx.h> E!WlQr:b$  
#ifdef _DEBUG F&CvqPI  
#define new DEBUG_NEW ZJFF4($qN  
#undef THIS_FILE M4;M.zxJv  
static char THIS_FILE[] = __FILE__; F;/^5T3wI  
#endif fGH)Fgo`  
#define MAX_KEY 100 #u"@q< )  
#define CTRLBIT 0x04 FP y}Wc*UA  
#define ALTBIT 0x02 6]GHCyo  
#define SHIFTBIT 0x01 rT-.'aQ2t  
#pragma data_seg("shareddata") t0xE&#4  
HHOOK hHook =NULL; W}7Uh b  
UINT nHookCount =0; 6o]{< T/'  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ',|OoxhbK  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT M a{@b$>  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ET H ($$M  
static int KeyCount =0; 3DCR n :  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ze LIOw  
#pragma data_seg() }U9dzU14  
HINSTANCE hins; <AJRU l  
void VerifyWindow(); 4S+E% b|)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) U![$7k>,pr  
//{{AFX_MSG_MAP(CHookApp) g@t..xJ,  
// NOTE - the ClassWizard will add and remove mapping macros here. B4zuWCE@  
// DO NOT EDIT what you see in these blocks of generated code! 5KTFf6Uq  
//}}AFX_MSG_MAP #5^OO ou|  
END_MESSAGE_MAP() PxWH)4  
&eO.h%@  
CHookApp::CHookApp() +|<bb8%  
{ -)&lsFF  
 // TODO: add construction code here, G&Yo2aADR  
 // Place all significant initialization in InitInstance HsRoiqo  
} mICx9oz]  
x~IrqdmW  
CHookApp theApp; .4w"3>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) p_zVrlVb  
{ V%t_,AT  
 BOOL bProcessed=FALSE; 'F*OlZ!BWy  
 if(HC_ACTION==nCode) B"88 .U}$  
 { iYdg1  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;$]a.9 -  
   switch(wParam) Hit )mwfYE  
   { /r&4< @  
    case VK_MENU: -J'ked  
     MaskBits&=~ALTBIT; pp#!sRUKPV  
     break; %k"hzjXAw  
    case VK_CONTROL: wT3D9N.  
     MaskBits&=~CTRLBIT; 1Qjc*+JzO.  
     break; K0@bh/i/^  
    case VK_SHIFT: :YLYCVi|  
     MaskBits&=~SHIFTBIT; GsD?Z%t~%  
     break; @QYCoEU8J  
    default: //judge the key and send message P3a]*>.,  
     break; b; vVlIG  
   } u#V;  
   for(int index=0;index<MAX_KEY;index++){ gH"a MEC  
    if(hCallWnd[index]==NULL) zT!.5qd  
     continue; V sL*&Fk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +,T}x+D  
    { 31]Vo;D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3 UQBIrQ  
     bProcessed=TRUE; J!Rqm!)q  
    }   LR4W  
   } f*m^x7  
  } I;<__  
  else if((lParam&0xc000ffff)==1){ //Key down l4I',79l  
   switch(wParam) 6aAN8wO;b  
   { $fPiR  
    case VK_MENU: ]g%HU%R-m  
     MaskBits|=ALTBIT; C.}ho.} r  
     break; *Hv d  
    case VK_CONTROL: Pc+,iK>  
     MaskBits|=CTRLBIT; ^|!\IzDp  
     break; e-xT.RnQ  
    case VK_SHIFT: z,!A4ws  
     MaskBits|=SHIFTBIT; G!D~*B9 G  
     break; ^g<Lu/5w  
    default: //judge the key and send message >Fe=PRs  
     break; dJb7d`  
   } nxm*.&#p?  
   for(int index=0;index<MAX_KEY;index++) k<o<!   
   { nAsc^ Yh  
    if(hCallWnd[index]==NULL) F"tM?V.|  
     continue; |^w&dj\,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `"xzC $  
    { '81Rwp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); hig t(u  
     bProcessed=TRUE; Mu$q) u  
    } J3r':I}\  
   } JvJ)}d$,&  
  } Pi%-bD/w  
  if(!bProcessed){ V Kc`mE  
   for(int index=0;index<MAX_KEY;index++){ k?Zcv*[)D+  
    if(hCallWnd[index]==NULL) l`:-B 'WM  
     continue; 1P BnGQYM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F=UW[zy/[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); COH.`Tv{*  
   } 09iD| $~  
  } [eDRghK  
 } dVJ9cJ9^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Lk)TK/JM)  
} 1"1ElH  
1aUu:#c  
BOOL InitHotkey() #yCnM]cEn  
{ a^&RV5o  
 if(hHook!=NULL){ LsK fCB}  
  nHookCount++; |c2;`T#`o  
  return TRUE; tU8aPiUl  
 } :yOJL [x  
 else 1-G-p:|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); CZCVC (/u  
  if(hHook!=NULL) grDz7\i:  
   nHookCount++; z-nV!#  
  return (hHook!=NULL); /DSy/p0%  
} JgldC[|7  
BOOL UnInit() +J !1z  
{ D6P/39}W  
 if(nHookCount>1){ Z~"8C Kz  
  nHookCount--; 7z8   
  return TRUE; 7#g<fh  
 } O-+!KXHd[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); pTYV@5|  
 if(unhooked==TRUE){ Q0""wR q'  
  nHookCount=0; 2bpFQ8q  
  hHook=NULL; 7. eiM!7g  
 } S.owVMQ  
 return unhooked; <FvljKuq+  
} 0B5d$0  
t\ 9Y)d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }sfv zw_  
{ L%.=Sb mS  
 BOOL bAdded=FALSE; XfwH1n/o#  
 for(int index=0;index<MAX_KEY;index++){ A+hT2Ew@t}  
  if(hCallWnd[index]==0){ &([Gc+"5E.  
   hCallWnd[index]=hWnd; wY7+E/  
   HotKey[index]=cKey; R1:7]z0B  
   HotKeyMask[index]=cMask; DEenvS`,P  
   bAdded=TRUE; >LFj@YW_)  
   KeyCount++; Nw3IDy~T  
   break; * \ tR  
  } N)YoWA>#bF  
 } uq]E^#^  
 return bAdded; \&s$?r  
} GS!1K(7  
Uetna!ABB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Nbm$ta  
{ PE+{<[n  
 BOOL bRemoved=FALSE; U9//m=_  
 for(int index=0;index<MAX_KEY;index++){ A~wyn5:_  
  if(hCallWnd[index]==hWnd){ 0h"uJco,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .1""U ']  
    hCallWnd[index]=NULL; i# Fe`Z ~J  
    HotKey[index]=0; ^aL> /'Y#|  
    HotKeyMask[index]=0; 95-%>?4  
    bRemoved=TRUE; ??Dv\yLZI  
    KeyCount--; Ozc9yy!%  
    break; ze#ncnMo  
   } M`@Es#s  
  } 7+J<N@.d  
 } mP ^*nB@,  
 return bRemoved; MAG /7T5  
} C2K<CDVw  
3;EBKGg|  
void VerifyWindow() ? )"v~vs  
{ n,|YJ,v[  
 for(int i=0;i<MAX_KEY;i++){ /_/Z/D!  
  if(hCallWnd!=NULL){ Hd~fSXFl  
   if(!IsWindow(hCallWnd)){ <V4"+5cJ8  
    hCallWnd=NULL; ^|%7}=e  
    HotKey=0; +PHuQ  
    HotKeyMask=0; _dn*H-5hO  
    KeyCount--; boIFN;Aq"  
   } q%Lw#f  
  } M_F4I$V4  
 } DOW Z hD  
} Z , 98  
VD2o#.7*eu  
BOOL CHookApp::InitInstance() RS  Vt  
{ s Qa9M  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); O>arCr=H  
 hins=AfxGetInstanceHandle(); fH;lh-   
 InitHotkey(); Oat #%  
 return CWinApp::InitInstance(); D?9EO=  
} @|Hx >|p  
8BM[c;-{g`  
int CHookApp::ExitInstance() ;+VHi%5Z  
{ {=kW?  
 VerifyWindow(); ( z%t  
 UnInit(); J y0TVjA  
 return CWinApp::ExitInstance(); $ 4A!Y  
} Zq\ p%AU9  
LwEc*79  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]4&B*]j  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) A,GJ6qp3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ z_9q T"vF  
#if _MSC_VER > 1000 ^p #bxN")  
#pragma once  1O@ cev;  
#endif // _MSC_VER > 1000 hHqsI`7c  
0,[- 4m  
class CCaptureDlg : public CDialog ${, !Ll7)  
{ m:5bb 3  
 // Construction L"V~M F  
 public: wHhIa3_v  
  BOOL bTray; Gjf1Ba  
  BOOL bRegistered; %{";RfSVX%  
  BOOL RegisterHotkey(); Y t0s  
  UCHAR cKey; ;i;;{j@$i  
  UCHAR cMask; |#(g 8ua7  
  void DeleteIcon(); L~L]MC&  
  void AddIcon(); y O?52YO  
  UINT nCount; Zq"wq[GCN  
  void SaveBmp(); A/*h[N+2!  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +8V |  
  // Dialog Data kX]p;C  
  //{{AFX_DATA(CCaptureDlg) J~rjI24  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ph C{Gg  
  CComboBox m_Key; ~dj4Q eu  
  BOOL m_bControl; Qx !! Ttd{  
  BOOL m_bAlt; 5[>N[}Ck>  
  BOOL m_bShift; >oc&hT  
  CString m_Path; v`u>; S_  
  CString m_Number; 7)v`l1  
  //}}AFX_DATA q e;O Ox  
  // ClassWizard generated virtual function overrides vpqMKyy  
  //{{AFX_VIRTUAL(CCaptureDlg) f%TP>)jag!  
 public: D z5(v1I9A  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 3` \)Qm  
 protected: X+k`UM~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s2\6\8Ipn  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _<G%  
  //}}AFX_VIRTUAL aQhr$aH  
  // Implementation >d#6qXKAU  
 protected: } T<oLvS  
  HICON m_hIcon; pNR69/wGi  
  // Generated message map functions 1`8(O >5  
  //{{AFX_MSG(CCaptureDlg) oq}Q2[.b  
  virtual BOOL OnInitDialog(); vH9Gf  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >iB-gj}>X  
  afx_msg void OnPaint(); b'~IFNt*^  
  afx_msg HCURSOR OnQueryDragIcon(); i3\6*$Ug  
  virtual void OnCancel(); 9k>=y n  
  afx_msg void OnAbout();  |{@_J  
  afx_msg void OnBrowse(); -)ag9{*  
  afx_msg void OnChange(); ; +E@h=?  
 //}}AFX_MSG " ^:$7~%bA  
 DECLARE_MESSAGE_MAP() HFd>UdT%  
}; vxC,8Z  
#endif auT$-Ki8  
i#y3QCNqf^  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 6J%+pt[tu  
#include "stdafx.h" N8:&v  
#include "Capture.h" )IP{yL8c  
#include "CaptureDlg.h" *Ad7GG1/u  
#include <windowsx.h> yS:1F PA$_  
#pragma comment(lib,"hook.lib") 2Md'<.  
#ifdef _DEBUG IKV:J9  
#define new DEBUG_NEW mh8~w~/[  
#undef THIS_FILE aF\?X &|  
static char THIS_FILE[] = __FILE__; W e*)RXm%  
#endif n/]$k4h  
#define IDM_SHELL WM_USER+1 Yl6\}_h`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g$ oe00b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )z#M_[zC>  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]w=6.LzO*  
class CAboutDlg : public CDialog juuV3et  
{ iy_\1jB0  
 public: zx{O/v KG  
  CAboutDlg(); r'ydjy  
  // Dialog Data 5=.EngG  
  //{{AFX_DATA(CAboutDlg) q#~]Hp=W5  
  enum { IDD = IDD_ABOUTBOX }; 35[8XD  
  //}}AFX_DATA XK5qE"  
  // ClassWizard generated virtual function overrides mjqVP.  
  //{{AFX_VIRTUAL(CAboutDlg) /RmHG H!  
 protected: _}B:SM  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R?Or=W)i  
  //}}AFX_VIRTUAL ~:%rg H  
  // Implementation K9y!ZoB  
 protected: nC5  
  //{{AFX_MSG(CAboutDlg) NK@G0p~O  
  //}}AFX_MSG 8HLcDS#  
  DECLARE_MESSAGE_MAP() 7E9h!<5v  
}; .1F^=C.w  
H19CVc\B  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) k98}Jx7J)"  
{ x@]pUA1  
 //{{AFX_DATA_INIT(CAboutDlg) 6A& f  
 //}}AFX_DATA_INIT k&1~yW  
} '.wyfSH@  
AT{ewb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) g{ cHh(S  
{ )ccd fSe  
 CDialog::DoDataExchange(pDX); nJ4CXSdE  
 //{{AFX_DATA_MAP(CAboutDlg) e1RtoNF^  
 //}}AFX_DATA_MAP ;U|^Tsuc`  
} h?:lO3)TL=  
df7z& {R  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) THmX=K4=?  
 //{{AFX_MSG_MAP(CAboutDlg) ZK[S'(6q  
 // No message handlers Cu\A[6g,  
 //}}AFX_MSG_MAP o?J>mpC  
END_MESSAGE_MAP() ZC1U  
iM Xl}3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) nV0"q|0K;  
: CDialog(CCaptureDlg::IDD, pParent) {Z_Pry$6  
{ ;Db89Nc$  
 //{{AFX_DATA_INIT(CCaptureDlg) 1& k_&o  
  m_bControl = FALSE; 3a4 ]{  
  m_bAlt = FALSE; 8F<Qc*'  
  m_bShift = FALSE; %L./U$  
  m_Path = _T("c:\\"); ?~a M<rcZ  
  m_Number = _T("0 picture captured."); jz$)*Kdi*  
  nCount=0; -< 7KW0CA  
  bRegistered=FALSE; OZ q/'*  
  bTray=FALSE; +*Cg2`  
 //}}AFX_DATA_INIT 8<t?o'9I  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <&o `T4  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); .O'gD.|^N  
} !o 7uZC\  
+mP3 y~|-j  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -NVk>ENL4  
{ T!hU37g h?  
 CDialog::DoDataExchange(pDX); 2 f]9I1{  
 //{{AFX_DATA_MAP(CCaptureDlg) 2I'\o7Y  
  DDX_Control(pDX, IDC_KEY, m_Key); Wv"[,5 Z13  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 'Z7oPq6  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 'sm+3d  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); VPf*>ph=  
  DDX_Text(pDX, IDC_PATH, m_Path); (o\:rLZu  
  DDX_Text(pDX, IDC_NUMBER, m_Number); '7W?VipU  
 //}}AFX_DATA_MAP fwIZr~l  
} xnu|?;.}!  
+MQf2|--  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) A;h0BQm/j  
//{{AFX_MSG_MAP(CCaptureDlg) I,AI$A  
 ON_WM_SYSCOMMAND() UJ)\E ^Hp  
 ON_WM_PAINT() t9PS5O ;  
 ON_WM_QUERYDRAGICON() ?#\?&uFJ}  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) SF;;4og  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  { Lt \4h  
 ON_BN_CLICKED(ID_CHANGE, OnChange) fj 19U9R  
//}}AFX_MSG_MAP _SC>EP8:Z  
END_MESSAGE_MAP() R$*{@U  
QH4nb h4  
BOOL CCaptureDlg::OnInitDialog() )E^4\3 ^:  
{ Ckvm3r\i2  
 CDialog::OnInitDialog(); &K`[SX=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $xS `i-|  
 ASSERT(IDM_ABOUTBOX < 0xF000); ;G~0 VM2|  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 9h$-:y3  
 if (pSysMenu != NULL) ;P _`4w3  
 { SM:{o&S`  
  CString strAboutMenu; ?}B9=R$Pi  
  strAboutMenu.LoadString(IDS_ABOUTBOX); a7q-*%+d5  
  if (!strAboutMenu.IsEmpty()) y6; '?.Y1  
  { Gz!72H  
   pSysMenu->AppendMenu(MF_SEPARATOR); Gn;eh~uw;l  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); + &b`QcH<  
  } `ivr$b#  
 } tZ=BK:39\  
 SetIcon(m_hIcon, TRUE); // Set big icon 0sq/_S  
 SetIcon(m_hIcon, FALSE); // Set small icon RN3w{^Ll  
 m_Key.SetCurSel(0); .d9VV&  
 RegisterHotkey(); (^9q7)n  
 CMenu* pMenu=GetSystemMenu(FALSE); {:Z#8dGe  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); S]1+tj  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [8SW0wsk  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 'mug,jM  
 return TRUE; // return TRUE unless you set the focus to a control m{x!uq  
} uwWfL32  
mb?DnP,z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) i2$U##-ro]  
{ d Z"bc]z{  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )u ]<8  
 { Tc\^=e^N?  
  CAboutDlg dlgAbout; ,q/K&'0`  
  dlgAbout.DoModal(); G+'MTC_  
 } u3 ?+Hu|*T  
 else $&k2m^R<  
 { *=S\jek  
  CDialog::OnSysCommand(nID, lParam); 4^alAq^  
 } K~@-*8%  
} X&M4 c5Li  
*D,+v!wG9  
void CCaptureDlg::OnPaint() '4FS.0*_  
{ =}r&>|rrJ  
 if (IsIconic()) %o#D"  
 {  X\ \\RCp  
  CPaintDC dc(this); // device context for painting N(}7M~m>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); f;pR8  
  // Center icon in client rectangle ~?-U J^#  
  int cxIcon = GetSystemMetrics(SM_CXICON); $1\<>sJH  
  int cyIcon = GetSystemMetrics(SM_CYICON); \p@,+ -gX  
  CRect rect; 5]p>& |Ud  
  GetClientRect(&rect); L|6clGp  
  int x = (rect.Width() - cxIcon + 1) / 2; VrO$SmH  
  int y = (rect.Height() - cyIcon + 1) / 2; xv 7^  
  // Draw the icon YIfPE{,  
  dc.DrawIcon(x, y, m_hIcon); $|6Le; K  
 } cdP+X'Y4D  
 else \(Zdd \,  
 { Zu\#;O   
  CDialog::OnPaint(); V>A@Sw  
 } I LF"m;  
} MJV&%E6{:{  
7x-k-F3  
HCURSOR CCaptureDlg::OnQueryDragIcon() c 2?(.UV  
{ xYM/{[  
 return (HCURSOR) m_hIcon; x}N+vK   
} z=>]E 1'RL  
):LJ {.0R  
void CCaptureDlg::OnCancel() IDE@{Dy  
{ #B`"B  
 if(bTray) -&))$h3o\  
  DeleteIcon(); ^bL.|vB  
  CDialog::OnCancel(); !j%)nU  
} @/anJrt  
3'u%[bx E  
void CCaptureDlg::OnAbout()  T_jwj N  
{ =#T6,[5  
 CAboutDlg dlg; 5 ;dg#hO  
 dlg.DoModal(); <LZvG IMl  
} F2oY_mA  
&E {/s  
void CCaptureDlg::OnBrowse() 8dIgw  
{ ;c:vz F~Q  
 CString str; 0[PP Vr:  
 BROWSEINFO bi; JYm@Llf)$  
 char name[MAX_PATH]; XuR!9x^5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 7F\U|kx_  
 bi.hwndOwner=GetSafeHwnd(); s;8J= \9W  
 bi.pszDisplayName=name; NO`a2HR$  
 bi.lpszTitle="Select folder"; )dC%g=dtc  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; G0> 'H1Z  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); b4ORDU  
 if(idl==NULL) r^#.yUz  
  return; 0 "pm7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); b0LQ$XM>8  
 str.ReleaseBuffer(); 0\o0(eHCQz  
 m_Path=str; @WBy:gV"  
 if(str.GetAt(str.GetLength()-1)!='\\') {x2N~1!E  
  m_Path+="\\"; [_-CO }>  
 UpdateData(FALSE); vj?9X5A_  
} HEjV7g0E  
D\j1`  
void CCaptureDlg::SaveBmp() vWe)cJ  
{ Ik;~u8j1e  
 CDC dc; z6'zNM7M  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); @YpA'cX7  
 CBitmap bm; =,gss&J!!  
 int Width=GetSystemMetrics(SM_CXSCREEN); _Mq@58q'  
 int Height=GetSystemMetrics(SM_CYSCREEN); 8"8sI  
 bm.CreateCompatibleBitmap(&dc,Width,Height); x*BfRj  
 CDC tdc; 1K^/@^  
 tdc.CreateCompatibleDC(&dc); ^x 4,}'(  
 CBitmap*pOld=tdc.SelectObject(&bm); ,W{Qv<oo  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); x3wyIio*  
 tdc.SelectObject(pOld); I+`~6  
 BITMAP btm; Cd|V<BB9  
 bm.GetBitmap(&btm); v{?9PRf\s  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; z?j~ 2K<4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); I|Z5*iXqCm  
 BITMAPINFOHEADER bih; -BQM i0  
 bih.biBitCount=btm.bmBitsPixel; (zJ TBI'  
 bih.biClrImportant=0; !R{L`T0  
 bih.biClrUsed=0; ']Y:f)i#  
 bih.biCompression=0; T`a [~:  
 bih.biHeight=btm.bmHeight; 3gv>AgG  
 bih.biPlanes=1; eg?vYW  
 bih.biSize=sizeof(BITMAPINFOHEADER); jn)~@~c  
 bih.biSizeImage=size; m]7yc>uDy  
 bih.biWidth=btm.bmWidth; CzNSJVE5  
 bih.biXPelsPerMeter=0; /=m=i%& #  
 bih.biYPelsPerMeter=0; db.iMBki  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); P>4(+s  
 static int filecount=0; /:yKa=$  
 CString name; w:M faN*  
 name.Format("pict%04d.bmp",filecount++); <ezvz..g  
 name=m_Path+name; 2!]':(8mR  
 BITMAPFILEHEADER bfh; !WVF{L,/I  
 bfh.bfReserved1=bfh.bfReserved2=0; q3scz  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Gtg; 6&2  
 bfh.bfSize=54+size; "5Kx]y8  
 bfh.bfOffBits=54; %I6iXq#  
 CFile bf; )vuxy  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ fKrOz! b  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [|k@Suv |z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O$$s]R6  
  bf.WriteHuge(lpData,size); [(#ncR8B  
  bf.Close(); Bj%{PK  
  nCount++; O;qS 3  
 } oB_{xu$6|  
 GlobalFreePtr(lpData); Q6.},o  
 if(nCount==1) .f(x9|K^  
  m_Number.Format("%d picture captured.",nCount); ] MUuz'<  
 else Eg  w?  
  m_Number.Format("%d pictures captured.",nCount); 3ufUB^@4v  
  UpdateData(FALSE); 5zfaqt`  
} KS(s<ip|  
{CQA@p:Y}  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) lQ! 6n  
{ gtCd#t'(V  
 if(pMsg -> message == WM_KEYDOWN) dLQ!hKD~  
 { "'6KQnpZ  
  if(pMsg -> wParam == VK_ESCAPE) s|EP/=9i  
   return TRUE; xQaN\):^8  
  if(pMsg -> wParam == VK_RETURN) r%_)7Wk*  
   return TRUE; 8#7z5:_  
 } ]<z>YyBA  
 return CDialog::PreTranslateMessage(pMsg); s)ZL`S?</  
} 9O@ eJ$  
6PvV X*5T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]'T-6  
{ ,VJ0J!@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =$b^ X?x  
  SaveBmp(); Sfh\4h$H  
  return FALSE; SC86+  
} \ J9@p  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ oEKLuy  
 CMenu pop; sbkWJy  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &*MwKr<y  
 CMenu*pMenu=pop.GetSubMenu(0); M@8 <^CK  
 pMenu->SetDefaultItem(ID_EXITICON); ZIpL4y =_  
 CPoint pt; H$1R\rE`  
 GetCursorPos(&pt); lm]4zs /A  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); MK~viSgi  
 if(id==ID_EXITICON) /pX\)wi  
  DeleteIcon(); Ds0^/bYp&  
 else if(id==ID_EXIT) Cd6^aFoK!  
  OnCancel(); LA"`8  
 return FALSE; }v@w(*)h:  
} #,!.e  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (B,CL222x  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [",W TZ:  
 AddIcon(); =wI ,H@  
 return res; ~{U~9v^v (  
} 8~rD#8`6j  
I.q nA  
void CCaptureDlg::AddIcon() A9$q;8= <  
{ qBKIl= ne  
 NOTIFYICONDATA data; t[iE >  
 data.cbSize=sizeof(NOTIFYICONDATA); Os?~U/  
 CString tip; .xCO_7Rd  
 tip.LoadString(IDS_ICONTIP); 3VA Lrb;  
 data.hIcon=GetIcon(0); m:Z=: -x  
 data.hWnd=GetSafeHwnd(); yWt87+%T  
 strcpy(data.szTip,tip); V\)@Yk2  
 data.uCallbackMessage=IDM_SHELL; SaQ_%-&#p  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; vPSH  
 data.uID=98; 0'z$"(6D  
 Shell_NotifyIcon(NIM_ADD,&data); !*+~R2&b  
 ShowWindow(SW_HIDE); Yz.[CmdX  
 bTray=TRUE;  SvDVxK  
} GG%j+Ed  
H%Q@DW8~@  
void CCaptureDlg::DeleteIcon() #N@sJyI N  
{ *9?-JBT&F  
 NOTIFYICONDATA data; ~~:i+-[  
 data.cbSize=sizeof(NOTIFYICONDATA); G~u94rw|:  
 data.hWnd=GetSafeHwnd(); 4J-)+C/edx  
 data.uID=98; ZqS'xN :k  
 Shell_NotifyIcon(NIM_DELETE,&data); s{`r$:!  
 ShowWindow(SW_SHOW); i<)c4  
 SetForegroundWindow(); N`8?bU7a}"  
 ShowWindow(SW_SHOWNORMAL); q=UKL`;C}U  
 bTray=FALSE; V0ulIKck  
} ]rC6fNhQ  
q9icj  
void CCaptureDlg::OnChange() l)=Rj`M  
{ jo{GPp}  
 RegisterHotkey(); &xrm;pO  
} 'UW7zL5  
waO*CjxE:  
BOOL CCaptureDlg::RegisterHotkey() MP;7 u%   
{ rc 9 \  
 UpdateData(); 8Z FPs/HP  
 UCHAR mask=0; /Q})%j1S0  
 UCHAR key=0; O2ety2}?f  
 if(m_bControl) J3y5R1?EP  
  mask|=4; d!e$BiC  
 if(m_bAlt) Gzc{2"p  
  mask|=2; osPX%k!yw  
 if(m_bShift) )bw^!w)  
  mask|=1; q ( H^H  
  key=Key_Table[m_Key.GetCurSel()]; 9'td}S  
 if(bRegistered){ &hyr""NkAm  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); )5Gzk&|  
  bRegistered=FALSE; "2N3L8?k  
 } VO#]IXaP  
 cMask=mask; K=+w,H# `C  
 cKey=key; GkaIqBS  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /|`;|0/2  
 return bRegistered; c i_XcG  
} zZ OoPE  
s e2+X>@>  
  四、小结 `3/,-  
H_vOZ0  
  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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