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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: 70c]|5  
  w7?fJ")  
  一、实现方法 Y\-xX:n.\  
UrvUt$WO  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: dz9U.:C  
Z{0BH{23  
#pragma data_seg("shareddata") f+ceL'fr  
HHOOK hHook =NULL; //钩子句柄 8-nf4=ll  
UINT nHookCount =0; //挂接的程序数目 ~%/Rc`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 zg<-%r'$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 . |T=T0^  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey B]"`}jn  
static int KeyCount =0; ^_bG{du  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 `sCaGCp  
#pragma data_seg() ,-y9P  
V[nPTYO4  
  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。 NVv <vu  
T(7`$<TQ  
  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: 29RP$$gR  
DQXUh#t\(]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?8V.iHJk  
cKey,UCHAR cMask) eTx9fx w  
{ ux&"TkEp  
 BOOL bAdded=FALSE; [v"Z2F<.=  
 for(int index=0;index<MAX_KEY;index++){ `3rwqcxA  
  if(hCallWnd[index]==0){ Wgls+<l8  
   hCallWnd[index]=hWnd; ljNwt  
   HotKey[index]=cKey; ! dzgi:  
   HotKeyMask[index]=cMask; c}o 6Rm50  
   bAdded=TRUE; "17)`Yf  
   KeyCount++; f)/Z7*Z  
   break; OT])t<TF6  
  } |q77  
 } +H2Jhgi  
 return bAdded; Y7}>yC/GY  
} :G1ddb&0+  
//删除热键 x"12$7 9=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :]-oo*xP  
{ >q:%?mi  
 BOOL bRemoved=FALSE; b0$)G-E/Y  
 for(int index=0;index<MAX_KEY;index++){ {q0+PzgP  
  if(hCallWnd[index]==hWnd){ u< BU4c/p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -&8( MT*  
    hCallWnd[index]=NULL; &R72$H9C8i  
    HotKey[index]=0; S:_Ms{S  
    HotKeyMask[index]=0; YO7U}6wBt  
    bRemoved=TRUE; E JkHPn  
    KeyCount--; QO'Hyf t  
    break; hC:'L9Y  
   } 4qOzjEQ  
  } !wy _3a  
 } Y_'ERqQ  
 return bRemoved; n N<N~  
} t/i I!}  
b&z#ZY  
lYx_8x2  
  DLL中的钩子函数如下: Zo3!Hs ZA  
;l@94)@0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bBjr hi  
{ A>@#eyB  
 BOOL bProcessed=FALSE; @YI{E*?S  
 if(HC_ACTION==nCode) > {*cW  
 { cfLF@LW!])  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 aDbqh~7  
   switch(wParam) i 9) G t  
   {  3B&A)&pEO  
    case VK_MENU: Xul`>8y|  
     MaskBits&=~ALTBIT; x%B_v^^^  
     break; ?Z#N9Z~\  
    case VK_CONTROL: T`bYidA  
     MaskBits&=~CTRLBIT; ,"%C.9a  
     break; Z,).)y#B  
    case VK_SHIFT: /s\ m V  
     MaskBits&=~SHIFTBIT; }T?X6LA$I8  
     break; 4era5=  
    default: //judge the key and send message ) O0Cz n  
     break; 8MJJ w;  
   } AjVC{\Ik  
   for(int index=0;index<MAX_KEY;index++){ m!V,W*RNr  
    if(hCallWnd[index]==NULL) k"N>pjgd$  
     continue; %~LY'cfPse  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zKQ<Zr  
    { HGQ</5Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); sfM"!{7  
     bProcessed=TRUE; H5K Fm#  
    } \QvGkcDc{  
   } boo361L  
  } )pWgt5:7~  
  else if((lParam&0xc000ffff)==1){ //有键按下 oB:7R^a  
   switch(wParam) \`n(JV  
   { l;; 2\mL?  
    case VK_MENU: Y6jyU1>  
     MaskBits|=ALTBIT; 6j%%CWU{~  
     break;  U4!bW  
    case VK_CONTROL: my 'nDi  
     MaskBits|=CTRLBIT; "<CM 'R  
     break; }. &nEi`  
    case VK_SHIFT: clE9I<1v  
     MaskBits|=SHIFTBIT; VeA@HC`?"  
     break; ^)AECn  
    default: //judge the key and send message ='7m$,{(Q[  
     break; -$d?e%}#  
   } h,{m{Xh  
   for(int index=0;index<MAX_KEY;index++){ RHF"$6EAFG  
    if(hCallWnd[index]==NULL) uJ% <+I  
     continue; 7>Scf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W{6QvQD8  
    { !dqC6a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Kr}RFJ"d  
     bProcessed=TRUE; BIx*t9wA  
    } t>bzo6cj  
   } N1t4o~  
  } )&c2+Y@  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 c2E /-n4K@  
   for(int index=0;index<MAX_KEY;index++){ VI! \+A  
    if(hCallWnd[index]==NULL) -KiPqE%&G  
     continue; i fsh(^N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LRJX>+@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +:KZEFY?<  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 i).%GMv*r  
   } V+gZjuN$  
  } {]CZgqE{  
 } LO`0^r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 46?z*~*G  
} W{,fpm  
Hv/C40uM-  
  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: eR!# 1ar  
m<gdyY   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }+,Q&]>~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SoIK<*J  
$fb%?n{  
  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: jFSR+mP!  
]cRvdUGv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zEQ]5>mG  
{ ?^&ih:"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) +t7HlAXB#  
 { IFLphm5  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ql?w6qFs]  
  SaveBmp(); </I%VHP,[f  
  return FALSE; > X~\(|EM  
 } uLdHE5vr  
 …… //其它处理及默认处理  5wK==hZ  
} vl (``5{  
u Kx:7"KD  
}8O9WS  
  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。 }&v}S6T  
L$ T2 bul  
  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。 ,EQ0""G!  
#$WnMJ@  
  二、编程步骤 u(9pRr L  
v`h>5#_[  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; d?oXz|;H(  
(B#FLoK  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; R @\fqNq  
_S_,rTf&  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; F8%^Ed~@  
xF_u:}7`  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; IOHWb&N6  
XpAJP++  
  5、 添加代码,编译运行程序。 ?q!4REM  
\`k=9{R.  
三、程序代码 qnP4wRpr  
MWwqon|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL X}#vt?mu  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) G4 7^xR  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ U]Q 5};FK  
#if _MSC_VER > 1000 tB;PGk_6  
#pragma once ^gVQ6=z%  
#endif // _MSC_VER > 1000 XfcYcN  
#ifndef __AFXWIN_H__ < F5VJ  
#error include 'stdafx.h' before including this file for PCH _a&gbSQv  
#endif &v:zS$m>  
#include "resource.h" // main symbols ! fk W;|  
class CHookApp : public CWinApp <Sot{_"li  
{ )CXlPbhY?  
 public: =eA|gt  
  CHookApp(); yzEyOz@Q  
  // Overrides EW$drY@  
  // ClassWizard generated virtual function overrides Uz;^R@  
  //{{AFX_VIRTUAL(CHookApp) Q<>u) %92@  
 public: TG=A]--_a  
  virtual BOOL InitInstance(); 9Qyc!s`  
  virtual int ExitInstance(); N[@~q~v  
  //}}AFX_VIRTUAL *)[fGxz \  
  //{{AFX_MSG(CHookApp) Od.@G~  
  // NOTE - the ClassWizard will add and remove member functions here. +}jzge"  
  // DO NOT EDIT what you see in these blocks of generated code ! / `cy4<  
  //}}AFX_MSG QMMpB{FZ`o  
  DECLARE_MESSAGE_MAP() qkfof{z  
}; smCACQ$ (  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); gj;gl ="3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f@sC~A. 9\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j+!u=E  
BOOL InitHotkey(); '@t,G,FJ  
BOOL UnInit(); w/NT 5  
#endif _;}$/  
} W]A`-Jv  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. zFOtOz`9H  
#include "stdafx.h" >s%Db<(P=  
#include "hook.h" fBX@ MedC  
#include <windowsx.h> %:C6\4  
#ifdef _DEBUG gLMb,buqC  
#define new DEBUG_NEW WX Fm'5Vr  
#undef THIS_FILE W~H`{x%Av>  
static char THIS_FILE[] = __FILE__; 1n8y4k)  
#endif Q`i@['?p  
#define MAX_KEY 100 A^lm0[3q  
#define CTRLBIT 0x04 9>{ml&$  
#define ALTBIT 0x02 @+;.W>^h  
#define SHIFTBIT 0x01 .i\ FK@2  
#pragma data_seg("shareddata") ]Mq-67  
HHOOK hHook =NULL; ) `{jPK*`  
UINT nHookCount =0; dpz@T>MS=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ?z&n I#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT shB3[W{}!)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey jl59;.P  
static int KeyCount =0; S^R dj ]  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @ws&W=NQ  
#pragma data_seg() 3ZT3I1/D  
HINSTANCE hins; e=XP4h  
void VerifyWindow(); KyIUz9$  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &NF$_*\E  
//{{AFX_MSG_MAP(CHookApp) z*HM_u  
// NOTE - the ClassWizard will add and remove mapping macros here. )4fQ~)  
// DO NOT EDIT what you see in these blocks of generated code! (tO4UI5!  
//}}AFX_MSG_MAP &SIf|IX.  
END_MESSAGE_MAP() T=NLBJ  
g)f& mQ)  
CHookApp::CHookApp() [Zdrm:=]L  
{ 8XVRRk  
 // TODO: add construction code here, 6b*xhu\  
 // Place all significant initialization in InitInstance `C_qqf  
} h[! @8  
tIn`L6b  
CHookApp theApp; CeU=A9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  9qa/f[G  
{ m p_7$#{l  
 BOOL bProcessed=FALSE; a2?@OJ  
 if(HC_ACTION==nCode) ['>ZC3?"h  
 { !0p K8k&MG  
  if((lParam&0xc0000000)==0xc0000000){// Key up BZLIi O  
   switch(wParam) .{eMN[ n@  
   { ]@y%j'e  
    case VK_MENU: 3L2NenJB  
     MaskBits&=~ALTBIT; r5[pT(XT]  
     break; 8(ZQM01;  
    case VK_CONTROL: !Th5x2  
     MaskBits&=~CTRLBIT; XFTqt]  
     break; XX-(>B0L  
    case VK_SHIFT: (k+*0.T&?  
     MaskBits&=~SHIFTBIT; Ay Uw  
     break; z}}P+P/  
    default: //judge the key and send message "+2Cs  
     break; ,e|"p[z ~T  
   } B0 A`@9  
   for(int index=0;index<MAX_KEY;index++){ z\FBN=54z  
    if(hCallWnd[index]==NULL) 4'3;{k$z  
     continue; 0"j:-1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^$dbyj`  
    { ElTB{C>u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7Wv.-LD6  
     bProcessed=TRUE; $S>bcsAy  
    } *Mg@j;+5s  
   } ).HA #!SE  
  } He8]Eb  
  else if((lParam&0xc000ffff)==1){ //Key down d<Lc&wlP  
   switch(wParam) f5M;q;  
   { YXTV$A+lW  
    case VK_MENU: VJ h]j (  
     MaskBits|=ALTBIT; m|B)A"Sm  
     break; }>y !I5O  
    case VK_CONTROL: Rkg)yme!N  
     MaskBits|=CTRLBIT; An}RD73!w  
     break; h+Lpj^<2a  
    case VK_SHIFT: {tOf0W|  
     MaskBits|=SHIFTBIT; Px-VRANZt  
     break; 34CcZEQQ  
    default: //judge the key and send message 7f3,czW  
     break; 4n.JRR&;  
   } PN99 R]K0g  
   for(int index=0;index<MAX_KEY;index++) P3!@}!r8  
   { "N'W~XPG  
    if(hCallWnd[index]==NULL) D 9;pjY  
     continue; vC1fKo\p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L9^ M?.a  
    { &2%|?f|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); izcjI.3e,  
     bProcessed=TRUE; [QMN0#(h  
    } @x*xgf  
   } {m3#1iV9  
  } J:'_S `J  
  if(!bProcessed){ z80(+ `   
   for(int index=0;index<MAX_KEY;index++){ y5c\\e  
    if(hCallWnd[index]==NULL) ,%A|:T]  
     continue; 7MZH'nO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |_g7k2oLY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T9J&^I  
   } E;`^`T40  
  } ]jI<Js* F  
 } OpazWcMoo  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +VQD'  
} :Hb`vH3 x  
/? d)01  
BOOL InitHotkey() pdFO!A_t  
{ |Wa.W0A  
 if(hHook!=NULL){ qGhg?u"n:  
  nHookCount++; WqM| nX  
  return TRUE; i/C% 1<  
 } cGm?F,/`  
 else [;yH.wn#5  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); V=fh;p  
  if(hHook!=NULL) AB3OG*C9  
   nHookCount++; o,?G(  
  return (hHook!=NULL); =rZ'!Pa  
} PPFt p3C  
BOOL UnInit() !#%>,X#+  
{ yK&  
 if(nHookCount>1){ Ad,n+%"e  
  nHookCount--; H)S!%(x4  
  return TRUE; B#IUSHC  
 } &RbP N^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Tc"J(GWG  
 if(unhooked==TRUE){ 7vRp<  
  nHookCount=0; wC%qSy'  
  hHook=NULL; y'b*Dk{  
 } R|$b\3  
 return unhooked; RhB)AUAj  
} %rhZH^2  
iF +@aA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }=\?]9`  
{ 5|r*,! CF  
 BOOL bAdded=FALSE; 21Dc.t{  
 for(int index=0;index<MAX_KEY;index++){ "l-#v| 54  
  if(hCallWnd[index]==0){ WcT= 5G  
   hCallWnd[index]=hWnd; u23_*W\  
   HotKey[index]=cKey; x'\C'zeF  
   HotKeyMask[index]=cMask; g yV>k=B  
   bAdded=TRUE; 'wYIJK~1  
   KeyCount++; /TPtPq<7:#  
   break; N.q*jY= X|  
  } k18v{)i~  
 } JF~9efWe>  
 return bAdded; $kN=45SR  
} oj{CNa  
hi$AZ+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !"yr;t>|Zb  
{ 7T6Zlp  
 BOOL bRemoved=FALSE; 5y g`TW  
 for(int index=0;index<MAX_KEY;index++){ $v#`2S(7  
  if(hCallWnd[index]==hWnd){ &L+.5i  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G!B:>P|\l  
    hCallWnd[index]=NULL; BtbU?t  
    HotKey[index]=0; {Ak 4GL  
    HotKeyMask[index]=0; )=iv3nF?6N  
    bRemoved=TRUE; <b *sn] l  
    KeyCount--; 9M($_2,44  
    break; :2M&C+f[  
   } 'Nt)7U>oC9  
  } *U%3 [6hm  
 } H#V&5|K%  
 return bRemoved; >EFWevT{  
} g"|>^90  
|kvH`&s  
void VerifyWindow() L~;(M6Jp  
{ rOE: ap|KL  
 for(int i=0;i<MAX_KEY;i++){ *k8?$(  
  if(hCallWnd!=NULL){ Y-y yg4JH  
   if(!IsWindow(hCallWnd)){ 573,b7Yf  
    hCallWnd=NULL; /RqWrpzx@  
    HotKey=0; }Md;=_TP  
    HotKeyMask=0; -@_v@]:  
    KeyCount--; Q 318a0  
   } e Bxm  
  } E X'PRNB,  
 } a9p:k ]{  
} ! #! MTk  
6YNL4HE?  
BOOL CHookApp::InitInstance() qF `6l(  
{ =z"+)N  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !dGu0wE  
 hins=AfxGetInstanceHandle(); i@5Fne  
 InitHotkey(); ihwJBN>(  
 return CWinApp::InitInstance(); of_y<dd[G  
} ej}S{/<*n  
N2'aC} I  
int CHookApp::ExitInstance() %>=6v} f,+  
{ P[G>uA>Z1  
 VerifyWindow(); #>bj6<  
 UnInit(); :EQ{7Op`  
 return CWinApp::ExitInstance(); TbNH{w|p  
} MaHP):~  
;9h;oB@  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %EVgSF!r  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) R Qo a  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ < ]1,L%  
#if _MSC_VER > 1000 K6-M.I  
#pragma once |]@Pq[Hn|  
#endif // _MSC_VER > 1000 54z.@BJhE  
J@$~q}iG  
class CCaptureDlg : public CDialog !*"fWahv  
{ aif;h! ?y  
 // Construction /A-WI x  
 public: Ws`ndR  
  BOOL bTray; b\`S[  
  BOOL bRegistered; `a MU2  
  BOOL RegisterHotkey(); 9>9EZ?4m  
  UCHAR cKey; fM"*;LN!N  
  UCHAR cMask; ]"{8"+x  
  void DeleteIcon(); W +ER'lX  
  void AddIcon(); p+V#86(3  
  UINT nCount; J,CwC)  
  void SaveBmp(); \|{/.R  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor S$Zi{bU`G  
  // Dialog Data nDC0^&  
  //{{AFX_DATA(CCaptureDlg) Su2{nNC>  
  enum { IDD = IDD_CAPTURE_DIALOG }; -%yrs6  
  CComboBox m_Key; ;50&s .gZ  
  BOOL m_bControl; ,n8\y9{G  
  BOOL m_bAlt; sNo8o1Hby  
  BOOL m_bShift; i}DS+~8v  
  CString m_Path; [A,^ F0:h  
  CString m_Number; ]$lt  
  //}}AFX_DATA 18Y#=uH}  
  // ClassWizard generated virtual function overrides @0@ZlH wM  
  //{{AFX_VIRTUAL(CCaptureDlg) sg^|dS{3D  
 public: w(6n  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <8^x Mjc  
 protected: k[ro[E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `nl n@ ;  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); TMj;NSc3  
  //}}AFX_VIRTUAL I!S Eb  
  // Implementation !>`Fg>uy  
 protected: JaRsm'SIk~  
  HICON m_hIcon; n^T,R  
  // Generated message map functions kUgfFa#_  
  //{{AFX_MSG(CCaptureDlg) ~.%HZzR6&  
  virtual BOOL OnInitDialog(); <ErX<(0`ig  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )|lxzlk  
  afx_msg void OnPaint(); pqfX}x  
  afx_msg HCURSOR OnQueryDragIcon(); [^5;XD:%&l  
  virtual void OnCancel(); @9B*V~ <  
  afx_msg void OnAbout(); \CMZ_%~wU  
  afx_msg void OnBrowse(); A<X?1$  
  afx_msg void OnChange(); )?$[iu7 s  
 //}}AFX_MSG D:_W;b)  
 DECLARE_MESSAGE_MAP() c[,h|~K/_?  
}; 6UeYZ g  
#endif R{H[< s+n  
e(? w h   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file K@O^\  
#include "stdafx.h" 7pyzPc#_  
#include "Capture.h" ",$_\l  
#include "CaptureDlg.h" f_jhQ..g<g  
#include <windowsx.h> AzOs/q8O  
#pragma comment(lib,"hook.lib") ;2<5^hgk  
#ifdef _DEBUG {?H5Pw>{%h  
#define new DEBUG_NEW ;KlYiu  
#undef THIS_FILE hWT jN  
static char THIS_FILE[] = __FILE__; w*ans}P7  
#endif wfmM`4Y   
#define IDM_SHELL WM_USER+1 "r-P[EKpL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :u14_^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #s\@fp7A  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; L"m^LyU  
class CAboutDlg : public CDialog W[\6h Zv  
{ G@k]rwub  
 public: Dw%'u'HG  
  CAboutDlg(); 43PLURay  
  // Dialog Data !ajBZ>Q  
  //{{AFX_DATA(CAboutDlg) `5IrV&a  
  enum { IDD = IDD_ABOUTBOX }; i41~-?Bc  
  //}}AFX_DATA OM*c7&  
  // ClassWizard generated virtual function overrides y?<KN0j  
  //{{AFX_VIRTUAL(CAboutDlg) %y6(+I #P  
 protected: Qq<@;4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support gc.Lh~  
  //}}AFX_VIRTUAL #J"xByQKK  
  // Implementation N*o{BboK;  
 protected: UZyg_G6  
  //{{AFX_MSG(CAboutDlg) @AEH?gOX  
  //}}AFX_MSG LjI`$r.B  
  DECLARE_MESSAGE_MAP() !ZYPz}&N_  
}; `x[Is$  
6O7s^d&K  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) y7,I10:D  
{ =SfNA F  
 //{{AFX_DATA_INIT(CAboutDlg) s<s}6|Z  
 //}}AFX_DATA_INIT 8=`L#FkRp  
} )L:z r#  
[IL*}M!  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) bv[#|^/  
{ K~TwyB-h  
 CDialog::DoDataExchange(pDX); C^J<qq &  
 //{{AFX_DATA_MAP(CAboutDlg) Lx0nLJ\  
 //}}AFX_DATA_MAP cS;3,#$  
} SVe]2ONd  
g+ c*VmY  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^65I,Z"  
 //{{AFX_MSG_MAP(CAboutDlg) O3} JOv_  
 // No message handlers EwC]%BZP  
 //}}AFX_MSG_MAP ?QOU9"@+B  
END_MESSAGE_MAP()  `q?3ux  
b@Ej$t&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) qjB:6Jq4q  
: CDialog(CCaptureDlg::IDD, pParent) #-0e0  
{ $UR:j8C{p$  
 //{{AFX_DATA_INIT(CCaptureDlg) ^_WR) F'K  
  m_bControl = FALSE;  LR97FG  
  m_bAlt = FALSE; e4S@ J/D  
  m_bShift = FALSE; @Rr=uf G  
  m_Path = _T("c:\\"); 0:$ }~T9T  
  m_Number = _T("0 picture captured."); t'n@yX_  
  nCount=0; lPy|>&Yc  
  bRegistered=FALSE; V8^la'_j  
  bTray=FALSE; ~ :ASv>m  
 //}}AFX_DATA_INIT >JpBX+]5m  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 im<bo Mv  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); v:t;Uk^Y  
} %{u@{uG0'3  
nip6|dN  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |oY{TQ<<d  
{ $1yO Zp5  
 CDialog::DoDataExchange(pDX); lsz3'!%Y)  
 //{{AFX_DATA_MAP(CCaptureDlg) Rx-\B$G  
  DDX_Control(pDX, IDC_KEY, m_Key); fN&,.UB^p  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); e^y9Kmd  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 'ygKP6M  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); m\&|#yq  
  DDX_Text(pDX, IDC_PATH, m_Path); a-{|/ n%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ingG  
 //}}AFX_DATA_MAP {VcRur}&Y8  
} =zkN63S  
-DI >O/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 7he73  
//{{AFX_MSG_MAP(CCaptureDlg) 1m*)MZ)  
 ON_WM_SYSCOMMAND() EA"hie7  
 ON_WM_PAINT() W$4$%r8  
 ON_WM_QUERYDRAGICON() Coi[cfg0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0<,{poMM  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 586P~C[ic  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >8f~2dH2%  
//}}AFX_MSG_MAP Ku(YTXtK  
END_MESSAGE_MAP() 1d5%(:@  
/2tA n  
BOOL CCaptureDlg::OnInitDialog() %*R, ceuI  
{ EF0v!XW  
 CDialog::OnInitDialog(); giakEPl  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); YYWD\Y`8  
 ASSERT(IDM_ABOUTBOX < 0xF000); k@4N7}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }y(t')=9  
 if (pSysMenu != NULL) IW~R{ ]6  
 { TM)INo^  
  CString strAboutMenu; 6/UOz V,[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); `Fd \dn  
  if (!strAboutMenu.IsEmpty()) gRLt0&Q~  
  { qM\ 2f<)  
   pSysMenu->AppendMenu(MF_SEPARATOR); LV:L0D7y  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R(1:I@<?E  
  } hA7=:LG  
 } ;ku>_sG-  
 SetIcon(m_hIcon, TRUE); // Set big icon \+ se%O  
 SetIcon(m_hIcon, FALSE); // Set small icon Z& _kq|  
 m_Key.SetCurSel(0); x[0T$  
 RegisterHotkey(); nWd!ovd  
 CMenu* pMenu=GetSystemMenu(FALSE); qG9a!sj   
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); KF%BX ~80C  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); y;b#qUd5a  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m#_BF#  
 return TRUE; // return TRUE unless you set the focus to a control AyE*1 FD  
} .S k+"iH5  
%2QGbnt_*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) I9X \@ lTf  
{ @6;OF5VsQ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) `<7\Zl  
 { $$9H1)Ny  
  CAboutDlg dlgAbout; [JOa^U=  
  dlgAbout.DoModal(); p6DI7<C<H  
 } };Q}C0E  
 else &jDN6n3z  
 { Mu3G/|t(  
  CDialog::OnSysCommand(nID, lParam); , $7-SN  
 } 'O<b'}-A  
} q[s,q3n~  
dxeiN#(XT  
void CCaptureDlg::OnPaint() ,/f\  
{ C[7!pd  
 if (IsIconic()) JwG(WLb:  
 { 0D5Z#iW>1  
  CPaintDC dc(this); // device context for painting q5f QTV  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]#o;`5'  
  // Center icon in client rectangle hek+zloB+  
  int cxIcon = GetSystemMetrics(SM_CXICON); Rhc:szDU  
  int cyIcon = GetSystemMetrics(SM_CYICON); %\JGDM*m  
  CRect rect; ?C|'GkT  
  GetClientRect(&rect); N:`_Vl  
  int x = (rect.Width() - cxIcon + 1) / 2; L=lSW7R  
  int y = (rect.Height() - cyIcon + 1) / 2; 9z(SOzZn  
  // Draw the icon }B0[S_mw  
  dc.DrawIcon(x, y, m_hIcon); <"3q5ic/Z  
 } [jgVN w""D  
 else UC`h o%OBF  
 { KL$.E!d  
  CDialog::OnPaint(); >|3Y+X  
 } ?!RbS#QV}  
} f^pBXz9&=  
'\bokwsP  
HCURSOR CCaptureDlg::OnQueryDragIcon() ]it. R-  
{ 7y Cf3  
 return (HCURSOR) m_hIcon; hz/mNDE]  
} U$y 9f  
G&oD;NY@/  
void CCaptureDlg::OnCancel() m` 1dB%;?  
{ z^9oaoTl  
 if(bTray)  [N,+mX  
  DeleteIcon(); 7$*E0  
  CDialog::OnCancel(); Tvv>9gS  
} r_+Vb*|Y  
=%U &$d|@G  
void CCaptureDlg::OnAbout() "51/,D  
{ h8/tKyr8(  
 CAboutDlg dlg; "Q@m7j)(  
 dlg.DoModal(); u!X~!h-6~  
} [RBSUOF  
"(=g7,I4  
void CCaptureDlg::OnBrowse() pA8bFtt  
{ CR [>5/:M  
 CString str; DuC#tDP  
 BROWSEINFO bi; 8g -u  
 char name[MAX_PATH]; %n$f#Ml_r  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); [{Wo:c9Qq1  
 bi.hwndOwner=GetSafeHwnd(); 6FDj:~  
 bi.pszDisplayName=name; "](Q2  
 bi.lpszTitle="Select folder"; wR_mJMk_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; <zXG}JuL@T  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); / &Z8g4vc  
 if(idl==NULL) "L.k m  
  return; B EwaQvQ!  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); i*$+>3Q-  
 str.ReleaseBuffer(); &4OOW;,?<  
 m_Path=str; L } R"1O  
 if(str.GetAt(str.GetLength()-1)!='\\') GvtK=A$b  
  m_Path+="\\"; `,AOxJ:$  
 UpdateData(FALSE); '{WEyhaS  
} >lIzeEW#  
6%V:Z  
void CCaptureDlg::SaveBmp() 3P!OP{`  
{ Bw;isMx7  
 CDC dc; l~$)>?ZD  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;bwBd:Y  
 CBitmap bm; nc1~5eo  
 int Width=GetSystemMetrics(SM_CXSCREEN); <VZ43I  
 int Height=GetSystemMetrics(SM_CYSCREEN); }[leUYi`  
 bm.CreateCompatibleBitmap(&dc,Width,Height); {XU!p: x  
 CDC tdc; l2;$qNAo  
 tdc.CreateCompatibleDC(&dc); b@J"b(  
 CBitmap*pOld=tdc.SelectObject(&bm); ((gI OTV  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4A+g-{d  
 tdc.SelectObject(pOld); 4D&L]eJ  
 BITMAP btm; H!Gw@u]E  
 bm.GetBitmap(&btm); ;MeY@* "{  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; g#(+:^3'  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); '/`O*KD]  
 BITMAPINFOHEADER bih; @vq)Y2)r\  
 bih.biBitCount=btm.bmBitsPixel; T;DKDg a  
 bih.biClrImportant=0; ;?q(8^A  
 bih.biClrUsed=0; u^xnOVE  
 bih.biCompression=0; yr'-;-u  
 bih.biHeight=btm.bmHeight; }`CF(Do  
 bih.biPlanes=1; )ThNy:4  
 bih.biSize=sizeof(BITMAPINFOHEADER); C9+rrc@4  
 bih.biSizeImage=size; (-yif&  
 bih.biWidth=btm.bmWidth; "]jN'N(.  
 bih.biXPelsPerMeter=0; G+#bO5  
 bih.biYPelsPerMeter=0; tD`^qMua  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); }Bv1fbD4U  
 static int filecount=0; xD*Zcw(vj~  
 CString name; oL9<Fi  
 name.Format("pict%04d.bmp",filecount++); E 14DZ  
 name=m_Path+name; z wUC L  
 BITMAPFILEHEADER bfh; yLf9cS6=  
 bfh.bfReserved1=bfh.bfReserved2=0; !RJ@;S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ItLR|LO9  
 bfh.bfSize=54+size; l!}gWd,H  
 bfh.bfOffBits=54; AyQ5jkIE^{  
 CFile bf; v RtERFL  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ yW?-Z[  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); MgP|'H3\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); B^9C}QB  
  bf.WriteHuge(lpData,size); oaha5aWH  
  bf.Close(); >3&  
  nCount++; +6>2= ,?Z  
 } SN)Czi#7  
 GlobalFreePtr(lpData); GTOA>RB2  
 if(nCount==1) mNC?kp  
  m_Number.Format("%d picture captured.",nCount); @5&57R3>  
 else gGE{r}$  
  m_Number.Format("%d pictures captured.",nCount); W/A@qo"  
  UpdateData(FALSE); sT=|"H?  
} #}fvjJ{  
@|;[ ;:h@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +o3n%( ^~  
{ {8mJ<b>VA  
 if(pMsg -> message == WM_KEYDOWN) }WJX Q@  
 { `yq) y>_  
  if(pMsg -> wParam == VK_ESCAPE) pS-o*!\C.  
   return TRUE; r;b`@ .  
  if(pMsg -> wParam == VK_RETURN) Y->sJm  
   return TRUE; )0I -N)  
 } +|;Ri68  
 return CDialog::PreTranslateMessage(pMsg); G8]{pbX  
} !^Ay !  
oeKl\cgFx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) sRLjKi2D  
{ Q~"Lyy8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ o[wiQ9Tl  
  SaveBmp(); \RDqW+,  
  return FALSE; Ho}*Bn~ic  
} 1\Bh-tzB  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ auIW>0?}  
 CMenu pop; [ -Z 6QzT  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Z*P/ubV'  
 CMenu*pMenu=pop.GetSubMenu(0); !!A(A^s  
 pMenu->SetDefaultItem(ID_EXITICON); iLQO .'{U  
 CPoint pt; dH0>lV  
 GetCursorPos(&pt); )/f#~$ws  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); aPe*@py3T  
 if(id==ID_EXITICON) O:+y/c  
  DeleteIcon(); /(||9\;  
 else if(id==ID_EXIT) 7#"y mE  
  OnCancel(); Z}zka<y6K6  
 return FALSE; D]d! lMK/  
} B^M L}$  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); R4)l4rnO  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6`7`herE}  
 AddIcon(); _ \+0e:Ae  
 return res; !1S!)#  
} Y#):1C1  
 })!-  
void CCaptureDlg::AddIcon() 9(X~  
{ !<h9XccN  
 NOTIFYICONDATA data; L})fYVX  
 data.cbSize=sizeof(NOTIFYICONDATA); G,6`:l  
 CString tip; |CQjgI|;  
 tip.LoadString(IDS_ICONTIP); 6}@T^?  
 data.hIcon=GetIcon(0); UCmJQJc  
 data.hWnd=GetSafeHwnd(); B4*,]lS?  
 strcpy(data.szTip,tip); h+d k2|a  
 data.uCallbackMessage=IDM_SHELL; )y!gApNs"  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3bLOT#t  
 data.uID=98; e7iQG@i7  
 Shell_NotifyIcon(NIM_ADD,&data); 6t <[-  
 ShowWindow(SW_HIDE); X,M!Tp  
 bTray=TRUE; ~ D/Lo$K"  
} $0{ h Uex  
$h8?7:z;um  
void CCaptureDlg::DeleteIcon() Y$^vA[]c>  
{ ~y Dl & S  
 NOTIFYICONDATA data; 2fayQY xD  
 data.cbSize=sizeof(NOTIFYICONDATA); %26HB w=JF  
 data.hWnd=GetSafeHwnd(); / E!6]b/  
 data.uID=98; Z @m5hx&  
 Shell_NotifyIcon(NIM_DELETE,&data); V/\`:  
 ShowWindow(SW_SHOW); l YdATM(h  
 SetForegroundWindow(); 8% ; .H-  
 ShowWindow(SW_SHOWNORMAL); dqU)(T=C  
 bTray=FALSE; -NzOX"V]3  
} ^755 LW  
@VND}{j  
void CCaptureDlg::OnChange() 1*#hIuoj'  
{ mWoN\Rwj  
 RegisterHotkey(); )abH//Pps.  
} &a >UVs?=  
yWN'va1+$  
BOOL CCaptureDlg::RegisterHotkey() 5^qs>k[mN  
{ S=L#8CID  
 UpdateData(); BB/c5?V  
 UCHAR mask=0; LEg|R+ 6E  
 UCHAR key=0; &RS)U72  
 if(m_bControl) ndB qXS  
  mask|=4; *!NW!,R  
 if(m_bAlt) 9$(N q  
  mask|=2; otdv;xI9  
 if(m_bShift) ykx13|iR  
  mask|=1; KLj/,ehD !  
  key=Key_Table[m_Key.GetCurSel()]; I_Gm2 Dd  
 if(bRegistered){ q|lP?-j  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); d n%'bt  
  bRegistered=FALSE; RXWdqaENx  
 }  KI\ 9)  
 cMask=mask; A|mE3q=  
 cKey=key; q`|E9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); T/%k1Hsa4H  
 return bRegistered; kDiR2K&  
} sBxCi~  
 )DW".c  
  四、小结 *xeJ4h  
0!c/4^  
  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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