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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: VpX*l3  
  :28[k~.bo  
  一、实现方法 f}EsS  
RK/>5  
  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: :}-VLp4b  
OP|X-  
#pragma data_seg("shareddata") IdoS6   
HHOOK hHook =NULL; //钩子句柄 !5 ?<QKOe  
UINT nHookCount =0; //挂接的程序数目 3N ?"s1U  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 <m/XGFc  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _6m{zvyX>  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Dtox/ ,"  
static int KeyCount =0; xFcW%m>9C  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ;OC{B}.vH  
#pragma data_seg() }{}?mQ  
NIAji3  
  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。 >}B53.;.k  
=gC% =  
  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: Tol V3  
:Wihb#TO)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR _yp<#q]  
cKey,UCHAR cMask) $9h^tP'CV  
{ Pv|sPIIB7  
 BOOL bAdded=FALSE; cv;2zq=T  
 for(int index=0;index<MAX_KEY;index++){ P6")OWd  
  if(hCallWnd[index]==0){ <qVOd.9c  
   hCallWnd[index]=hWnd; b/_u\R ]-'  
   HotKey[index]=cKey; kzVK%[/  
   HotKeyMask[index]=cMask; wlQ @3RN>  
   bAdded=TRUE; p+228K ;H  
   KeyCount++; qOAP_\@T  
   break; k*OHI/uiow  
  } >`^;h]Q  
 } Wj8WT)cB  
 return bAdded; Gzp*Vr  
} v%kl*K`*  
//删除热键 X/bu z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tkmzOc H  
{ 3e>U(ES  
 BOOL bRemoved=FALSE; .e4upT GU  
 for(int index=0;index<MAX_KEY;index++){ +i[@+`  
  if(hCallWnd[index]==hWnd){ ,Iru_=Wk~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~Rx`:kQ  
    hCallWnd[index]=NULL; "EVf1iQ  
    HotKey[index]=0; '!`| H 3  
    HotKeyMask[index]=0; pd|l&xvka  
    bRemoved=TRUE; - _~\d+>w  
    KeyCount--; _C=01 %/  
    break; _0y]U];ce  
   } OKAmw >{  
  } WHqw=! G  
 } 8?rq{&$t  
 return bRemoved; |n;5D,r0C  
} 0$i\/W+  
If8Lt}-  
(:^YfG~e  
  DLL中的钩子函数如下: {P3gMv;  
%_G '#Bn<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sX ]gL  
{ K"!U&`T  
 BOOL bProcessed=FALSE; (1[Z#y[  
 if(HC_ACTION==nCode) E2tUL#  
 { ] K+8f-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3v&Shb?xb;  
   switch(wParam) oFhBq0@  
   {   N!Xn)J  
    case VK_MENU: "([lkn  
     MaskBits&=~ALTBIT; );?tGX  
     break; L3\( <[  
    case VK_CONTROL: I+`>e*:@W  
     MaskBits&=~CTRLBIT; 1ed^{Wa4$9  
     break; {suQ"iv  
    case VK_SHIFT: t. HwX9  
     MaskBits&=~SHIFTBIT; HdyE`FY\  
     break;  C~^T=IP  
    default: //judge the key and send message 3NdO3-~)  
     break; $oJjgAxcZ  
   } #bCUI*N"P  
   for(int index=0;index<MAX_KEY;index++){ %L$ ?Mey  
    if(hCallWnd[index]==NULL) 8w#4T:hsuN  
     continue; 7#N ?{3i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~+,ZD)AKi4  
    { jAovzZ6BL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %zR5q  Lb  
     bProcessed=TRUE; :2+z_+k}<  
    } 3#aLCpVla  
   } ^5)=) xVF  
  } \tA@A  
  else if((lParam&0xc000ffff)==1){ //有键按下  ~fs} J  
   switch(wParam) o}D }Q"=A  
   { 4;(W0RQa  
    case VK_MENU: CtUAbR  
     MaskBits|=ALTBIT; 9?^0pR p  
     break; ]AZCf`7/?  
    case VK_CONTROL: ~jzT;9:  
     MaskBits|=CTRLBIT; .yHK  
     break; FbH@qHSH  
    case VK_SHIFT: ;kZJnN"y  
     MaskBits|=SHIFTBIT; Q(R -8"  
     break; Galh _;=  
    default: //judge the key and send message m|;gl|dTB  
     break; m8eoD{  
   } ;iQw2XhT  
   for(int index=0;index<MAX_KEY;index++){ y-S23B(  
    if(hCallWnd[index]==NULL) /XNC^!z6Js  
     continue; H_ NoW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ir(U7D  
    { R8YU#D (Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q'Uv5p"X  
     bProcessed=TRUE; 7UqDPEXU]`  
    } of >  
   } =L;g:hc<  
  } r=xec@R]*  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ys:F  
   for(int index=0;index<MAX_KEY;index++){ )`2ncb   
    if(hCallWnd[index]==NULL) - ^Y\'y2  
     continue; `Gx 5=Bm;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |oQhtk8.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m 0Uu2Z4  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 p^Z|$aZZ  
   } 9H53H"5q  
  } VMS3Q)Ul  
 } a/rQ@c>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); DcC|oU[  
} ]ki) (Bb  
<e wcWr  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: xa 967Ki9"  
Dc 84^>l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dKevhm)R"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5A%Uv*  
#iRd2Qj%  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: FTzc,6  
u Tdz$Nh  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F^lau f  
{ {IF$\{Al  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) QHsJo|.  
 { cV7a, *  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 BqavI&1=  
  SaveBmp(); AbQ nx%$u  
  return FALSE; Fr<tk^~/  
 } ~wcp&D  
 …… //其它处理及默认处理 K_;?Sr=  
} Tu^H,vf  
HIvSh6|0p  
_s:5)  
  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。 ) bd`U  
e?\hz\^  
  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。 mZ0_^  
8M]QDgd.  
  二、编程步骤 -vh\XO  
mR#"ng  
  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"; @Hr1.f  
kLXa1^Lq  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; J:IAs:e`  
A6xN6{R!  
  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; 61sEeM  
/N")uuv  
  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; @HY P_hR  
kk OjAp{<t  
  5、 添加代码,编译运行程序。 ;g?o~ev 8  
n<eK\ w  
三、程序代码 6I|9@~!y[  
f %P#.  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL d_ &~^*>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Gsy90  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ $dKo}  
#if _MSC_VER > 1000 gEmsPk,  
#pragma once 4KW_#d`t  
#endif // _MSC_VER > 1000 >keY x<1  
#ifndef __AFXWIN_H__ ']H*f2y  
#error include 'stdafx.h' before including this file for PCH =`!# V/=  
#endif \SWuylE  
#include "resource.h" // main symbols RGBntp%  
class CHookApp : public CWinApp Y+EwBg)co  
{ aCyn9Y$=  
 public: D+h`Z]"|  
  CHookApp(); R0nUS<b0  
  // Overrides ,0?3k  
  // ClassWizard generated virtual function overrides qg*xdefQ%  
  //{{AFX_VIRTUAL(CHookApp) Q.V+s   
 public: l\u5RMS('  
  virtual BOOL InitInstance(); {axRq'=  
  virtual int ExitInstance(); ApcE)mjpc  
  //}}AFX_VIRTUAL ^~3{n  
  //{{AFX_MSG(CHookApp) $SzuUI  
  // NOTE - the ClassWizard will add and remove member functions here. vJQ_mz  
  // DO NOT EDIT what you see in these blocks of generated code ! >/.Ae8I)  
  //}}AFX_MSG bV*q~ @xh  
  DECLARE_MESSAGE_MAP() TUQe.oAi  
}; jz I,B  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1NAtg*`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D e$K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )$O'L7In&  
BOOL InitHotkey(); 3)l<'~"z<  
BOOL UnInit(); o%h[o9i  
#endif |KSoS#Y  
x139Ckn  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. /f>I;z1  
#include "stdafx.h" SPINV.  
#include "hook.h" Tq%##  
#include <windowsx.h> ~-A"M_n ?  
#ifdef _DEBUG =05jjR1  
#define new DEBUG_NEW Qqp=  
#undef THIS_FILE Nu><r  
static char THIS_FILE[] = __FILE__; )r XUJ29.  
#endif <fDbz1Q;l  
#define MAX_KEY 100 3\|PwA9fN8  
#define CTRLBIT 0x04 f/Q/[2t  
#define ALTBIT 0x02 * [b~2  
#define SHIFTBIT 0x01 \obM}caT  
#pragma data_seg("shareddata") 4@@gC&:Y  
HHOOK hHook =NULL; zH *7!)8  
UINT nHookCount =0; *{=q:E$  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Emv9l~mIu  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT raZ0B,;eFu  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )+a]M1j  
static int KeyCount =0; }5u;'>$  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ?cD_\~  
#pragma data_seg() GJBMaT  
HINSTANCE hins; K3`48,`?wA  
void VerifyWindow(); >NA{**$0  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) bhCAx W  
//{{AFX_MSG_MAP(CHookApp) |3gWH4M4**  
// NOTE - the ClassWizard will add and remove mapping macros here. |(5|6r3  
// DO NOT EDIT what you see in these blocks of generated code! ro^T L  
//}}AFX_MSG_MAP a*o k*r  
END_MESSAGE_MAP() l R^W*w4y  
zzX9Q:  
CHookApp::CHookApp() {<2q  
{ l, -q:8  
 // TODO: add construction code here, NOtwgZ-  
 // Place all significant initialization in InitInstance Y_nlIcu  
} -M-y*P)  
8qs8QK  
CHookApp theApp; rU7t~DKS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9|>5;Ej  
{ B(pHo&ox  
 BOOL bProcessed=FALSE; U> {CG+X  
 if(HC_ACTION==nCode) 31mlnDif  
 { r m dG"s  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^K!R4Y4t  
   switch(wParam) ;Y$d !an0  
   { )GJlQ1x  
    case VK_MENU: z_:r&UP`"  
     MaskBits&=~ALTBIT; a&gf0g;@I  
     break; >soSOJ[   
    case VK_CONTROL: XQj+]-m  
     MaskBits&=~CTRLBIT; {G _|gs  
     break; vtTXs]>  
    case VK_SHIFT: D 6F /9|  
     MaskBits&=~SHIFTBIT; w M#q [m;  
     break; _;k))K^  
    default: //judge the key and send message Xgo`XsA  
     break; }Q{4G  
   } C,5Erb/  
   for(int index=0;index<MAX_KEY;index++){ o%v,6yv  
    if(hCallWnd[index]==NULL) `R o>?H  
     continue; |d_ rK2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2Zi&=Zj"  
    { [Mlmn$it  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4,ewp coC%  
     bProcessed=TRUE; s;:quM  
    } 4?~Ei[KgQn  
   } xf8.PqVNo  
  } rB3b  
  else if((lParam&0xc000ffff)==1){ //Key down B zr}+J  
   switch(wParam) 58/\  
   { Y\{lQMCy  
    case VK_MENU: 7 6S>xnN  
     MaskBits|=ALTBIT; Jry643K>:;  
     break; H=5#cPI#(^  
    case VK_CONTROL: +Z%8X!Q  
     MaskBits|=CTRLBIT; t Ow[  
     break; b/eo]Id]  
    case VK_SHIFT: avH3{V  
     MaskBits|=SHIFTBIT; t($z+ C<  
     break; 6bt{j   
    default: //judge the key and send message 9;EY3[N  
     break;  SwmX_F#_  
   } K#plSD^f=  
   for(int index=0;index<MAX_KEY;index++) +,bgOq\aG  
   { 5>M@ F0  
    if(hCallWnd[index]==NULL) < nyk:E  
     continue; OY(znVHU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]Oe[;<I  
    { m{0u+obi&w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); , -S n  
     bProcessed=TRUE; /4u:5G  
    } 8\8%FSrc  
   } w7h=vy n?  
  } AmT*{Fz8  
  if(!bProcessed){ wGA%h.[M|  
   for(int index=0;index<MAX_KEY;index++){ 1z=}`,?>  
    if(hCallWnd[index]==NULL) WFFpW{  
     continue; nB86oQ/S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1V1T1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !)'|Y5 o  
   } 69/qH_Y  
  } .#ATI<t  
 } .t9zF-jk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); n!y}p q6  
} 9i#K{CkC|  
.ZOyZnr Z  
BOOL InitHotkey() 6c&OR2HGqO  
{ W[j7Vi8v  
 if(hHook!=NULL){ XY`2>7  
  nHookCount++; .Dg'MM BM  
  return TRUE; >eaK@u-'0  
 } =;A~$[g  
 else rzgzX  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Zu%oIk  
  if(hHook!=NULL) @?"t&h  
   nHookCount++; RlTVx :  
  return (hHook!=NULL); )ur&Mnmm  
} X+XbIbUuL  
BOOL UnInit() MBH/,Yd  
{ &b&o];a  
 if(nHookCount>1){ y2Z1B2E%f  
  nHookCount--; L\asrdL?=  
  return TRUE; "n=Ih_J  
 } Gu9x4p  
 BOOL unhooked = UnhookWindowsHookEx(hHook); )d-{#  
 if(unhooked==TRUE){ -2Azpeh  
  nHookCount=0; uDi#a~m@  
  hHook=NULL; %uLyL4*L(p  
 } prg8Iq'w  
 return unhooked; A)q,VSR8  
} 4lfJc9J  
"t" &6\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) q! U'DDEP  
{ 7?JcB?G4  
 BOOL bAdded=FALSE; }D eW2Jp  
 for(int index=0;index<MAX_KEY;index++){ j>OB<4?.+  
  if(hCallWnd[index]==0){ Yhd|1,m9f  
   hCallWnd[index]=hWnd; 8RR6f98FF  
   HotKey[index]=cKey; ;]^JUmxU[d  
   HotKeyMask[index]=cMask; ^@..\X9  
   bAdded=TRUE; +bK.{1  
   KeyCount++; lb('=]3 }H  
   break; i<Be)Y-'  
  } T"m(V/L$W  
 } F I\V6\B/  
 return bAdded; L)ry!BuHI  
} #FV(a~  
o<-+y\J8K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D`^9 u K  
{ ?V&[U  
 BOOL bRemoved=FALSE; d\ Z#XzI8  
 for(int index=0;index<MAX_KEY;index++){ &Wup 7  
  if(hCallWnd[index]==hWnd){ ZVek`Cc2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (_lc< Bj  
    hCallWnd[index]=NULL; 'u2Qq"d+  
    HotKey[index]=0; Sm%MoFf  
    HotKeyMask[index]=0; 2tqO%8`_  
    bRemoved=TRUE; 4x:Odt5  
    KeyCount--; =`]yq;(C7j  
    break; LvNk:99:<  
   }  VgNt  
  } [2,u:0"  
 } jP";ll|c  
 return bRemoved; XDJQO /qN  
} V-w[\u  
ynN[N(m#  
void VerifyWindow() G{ $Zg  
{ %R{clbbbn  
 for(int i=0;i<MAX_KEY;i++){ ]X)EO49  
  if(hCallWnd!=NULL){ ^$y_~z3o#7  
   if(!IsWindow(hCallWnd)){ BE }qwP^  
    hCallWnd=NULL; lA<IcW  
    HotKey=0; W$Bx?}x($  
    HotKeyMask=0; P( W8XC  
    KeyCount--; o;JBe"1  
   } .W&rcqy  
  } E 2DTE  
 } KV0e^c;  
} -~h2^Oez  
LV 94i  
BOOL CHookApp::InitInstance() !m1pL0  
{ T`=N^Ca1!`  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); )N2yhdcqI  
 hins=AfxGetInstanceHandle(); .n`MPx'  
 InitHotkey(); pz^"~0o5  
 return CWinApp::InitInstance(); mHox  
} d}',Bl+u{$  
D] 2+<;>`>  
int CHookApp::ExitInstance() !+H=e>Y6  
{ 8L 9;VY^Y  
 VerifyWindow(); I=^%l7  
 UnInit(); )[)-.{q  
 return CWinApp::ExitInstance(); 1p&?MxLN-a  
} <96ih$5D1  
l(zkMR$b8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hk&p+NV!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6|LDb"Rvy  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ zq]V6.]J  
#if _MSC_VER > 1000 b\?#O}  
#pragma once 3<msiC P  
#endif // _MSC_VER > 1000 {R,rc!yF  
%2oLND}?z  
class CCaptureDlg : public CDialog h{ce+~X  
{ H$ xSl1>E  
 // Construction {\ziy4<II  
 public: 4!6g[[| &J  
  BOOL bTray; wR/i+,K  
  BOOL bRegistered; )11/BB\v  
  BOOL RegisterHotkey(); BoIe<{X(9  
  UCHAR cKey; NnSI=M  
  UCHAR cMask; uW[s?  
  void DeleteIcon(); {M E|7TS=  
  void AddIcon(); qr=U= oK  
  UINT nCount; 4[.- a&!}  
  void SaveBmp(); 3g|O2>*?  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor S,S_BB<Y[b  
  // Dialog Data L*h X_8J  
  //{{AFX_DATA(CCaptureDlg) h2aJa@;S  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ok({Al1A,w  
  CComboBox m_Key; 60AX2-sdJ,  
  BOOL m_bControl; ~rY<y%K  
  BOOL m_bAlt; wQnr*kyza  
  BOOL m_bShift; K{>O. 5  
  CString m_Path; ^"+cJ)  
  CString m_Number; AD?^.<  
  //}}AFX_DATA dGh<R|U3  
  // ClassWizard generated virtual function overrides 5'V'~Q%  
  //{{AFX_VIRTUAL(CCaptureDlg) r?/>t1Z  
 public: N??<3j+Iu  
  virtual BOOL PreTranslateMessage(MSG* pMsg); T*h+"TmE  
 protected: >cM U<'&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S^D ~A8u  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _W#27I  
  //}}AFX_VIRTUAL ~P6K)V|@<  
  // Implementation S%xGXmZ  
 protected: cB<0~&  
  HICON m_hIcon; ;co{bk|rj  
  // Generated message map functions D|-]"(2i  
  //{{AFX_MSG(CCaptureDlg) 1<5 9)RiO>  
  virtual BOOL OnInitDialog(); rhn*k f{8  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "v*RY "5#  
  afx_msg void OnPaint(); R!pV`N  
  afx_msg HCURSOR OnQueryDragIcon(); &<^@/osi  
  virtual void OnCancel(); !>S' eXt  
  afx_msg void OnAbout(); `&9#!T.  
  afx_msg void OnBrowse(); <"[}8  
  afx_msg void OnChange(); Dh +^;dQ6  
 //}}AFX_MSG PL+fLCk,I  
 DECLARE_MESSAGE_MAP() ={L:q8v)  
}; `8'T*KU  
#endif Ha C?,  
B~PF<8h5  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "F[VqqD  
#include "stdafx.h" l1W5pmhK]'  
#include "Capture.h" m_Fw ;s/9  
#include "CaptureDlg.h" dEe/\i'r9  
#include <windowsx.h> eIqj7UY_  
#pragma comment(lib,"hook.lib") DD3J2J  
#ifdef _DEBUG w@%W{aUC  
#define new DEBUG_NEW ;:$Na=  
#undef THIS_FILE ":-)mfgGU  
static char THIS_FILE[] = __FILE__; A<.Q&4jb  
#endif p-(Z[G*  
#define IDM_SHELL WM_USER+1 /{kyjf[o&*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *=|i"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^~`8 - TE  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P^h2w%6'  
class CAboutDlg : public CDialog 7L-%5:1%  
{ i*U\~CZjT  
 public: VJR'B={h  
  CAboutDlg(); s9E:6  
  // Dialog Data WVN Q}KY  
  //{{AFX_DATA(CAboutDlg) }=GyBnXu  
  enum { IDD = IDD_ABOUTBOX }; iPFYG  
  //}}AFX_DATA BEI/OGp  
  // ClassWizard generated virtual function overrides |[{;*wtv  
  //{{AFX_VIRTUAL(CAboutDlg) GO?-z0V  
 protected: ~l}TlRqL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^c(PZ,/#JB  
  //}}AFX_VIRTUAL 3mm`8!R  
  // Implementation IYQYW.`ly  
 protected: Dh9-~}sW'  
  //{{AFX_MSG(CAboutDlg) wyc,Ir  
  //}}AFX_MSG l[fNftT-  
  DECLARE_MESSAGE_MAP() %MjPQ  
}; yh0|f94m  
%*19S.=l  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) }zobIfIF  
{ &J~S  $  
 //{{AFX_DATA_INIT(CAboutDlg) \ qs6%  
 //}}AFX_DATA_INIT W#lvH=y  
} hr{%'DAS  
-91l"sI  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y2qESAZ%k}  
{ SY$%!! @R  
 CDialog::DoDataExchange(pDX); cLYc""=  
 //{{AFX_DATA_MAP(CAboutDlg) VmUM _Q~  
 //}}AFX_DATA_MAP 6/-!oo   
} zEhy0LLm  
#VO2O0GR  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :,ym)|YV  
 //{{AFX_MSG_MAP(CAboutDlg) ~<Lf@yu-{  
 // No message handlers C3b'Q  
 //}}AFX_MSG_MAP 9=kTTFs  
END_MESSAGE_MAP() bL&]3n9Rwu  
)Xh_q3=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 5PPy+36<~  
: CDialog(CCaptureDlg::IDD, pParent) eY(usK  
{ %&] }P;&  
 //{{AFX_DATA_INIT(CCaptureDlg) mhVoz0%1X  
  m_bControl = FALSE; @"/}Al  
  m_bAlt = FALSE; *g,?13Q_  
  m_bShift = FALSE; $@Ay0GEI"  
  m_Path = _T("c:\\"); `-/l$A} U  
  m_Number = _T("0 picture captured."); (jm.vL&5j  
  nCount=0; ILO+=xU  
  bRegistered=FALSE; SQ Fey~  
  bTray=FALSE; n47=eKd70  
 //}}AFX_DATA_INIT v]BQIE?R /  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 JyqFFZ&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); jo|q,t  
} aW6+Up+G*  
Z*TW;h0ZQ3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _kx  
{ EU@mrm?  
 CDialog::DoDataExchange(pDX); <zf+Ii1:,  
 //{{AFX_DATA_MAP(CCaptureDlg) y="SzPl  
  DDX_Control(pDX, IDC_KEY, m_Key); V%0.%/<#5  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); /SUV'J)  
  DDX_Check(pDX, IDC_ALT, m_bAlt); nM; G; T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); |be r:1  
  DDX_Text(pDX, IDC_PATH, m_Path); R`* *!ku  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #PrV)en  
 //}}AFX_DATA_MAP :1lE98=  
}  g_>ZE  
-oZ a c  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wqwJpWIe  
//{{AFX_MSG_MAP(CCaptureDlg) t@u\ 4bv  
 ON_WM_SYSCOMMAND() x<Zhj3  
 ON_WM_PAINT() n>E*g|a  
 ON_WM_QUERYDRAGICON() R_qo]WvR;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) VA%"IAl  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Fkz  
 ON_BN_CLICKED(ID_CHANGE, OnChange) B@;)$1-UT  
//}}AFX_MSG_MAP YEQW:r_h.S  
END_MESSAGE_MAP() ) *A,L%  
'<0q"juXE  
BOOL CCaptureDlg::OnInitDialog()  q%k+x)  
{ )a^Yor)o"  
 CDialog::OnInitDialog(); uTU4Fn\$L  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @*DIB+K  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3opLLf_g  
 CMenu* pSysMenu = GetSystemMenu(FALSE); b66X])+4jE  
 if (pSysMenu != NULL) pq[mM!;#v  
 { w}.'Tebu  
  CString strAboutMenu; [Kj:~~`T   
  strAboutMenu.LoadString(IDS_ABOUTBOX); VRX" @uCD  
  if (!strAboutMenu.IsEmpty()) bS<@Rd{g  
  { qp W#!Vbx  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2Z O'X9  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); j>o +}p?3I  
  } bJ|?5  
 } <]'"e]  
 SetIcon(m_hIcon, TRUE); // Set big icon @ g75T`N  
 SetIcon(m_hIcon, FALSE); // Set small icon N4To#Q1w  
 m_Key.SetCurSel(0); ys/mv'#>  
 RegisterHotkey(); B\ _u${C  
 CMenu* pMenu=GetSystemMenu(FALSE); ~& 5&s  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Su"_1~/2S  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); x}.d`=  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); CJ?gjV6  
 return TRUE; // return TRUE unless you set the focus to a control 5ZA%,pH>Jq  
} PEBFN  
q~J oGTv  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) z}1xy+  
{ }o^A^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) g&4~nEp  
 { z/KZ[qH\  
  CAboutDlg dlgAbout; j#e.rNG  
  dlgAbout.DoModal(); kP)o=\|W{z  
 } ~RXpz-Ye  
 else 'Y[A'.*}4  
 { p? ?/r  
  CDialog::OnSysCommand(nID, lParam); O|Ic[XfLx  
 } x~;EH6$5'/  
} tHtV[We.:  
/Tj"Fl\h  
void CCaptureDlg::OnPaint() <M,H9^&#l3  
{ r.W,-%=bL  
 if (IsIconic()) rh`.$/^  
 { Yg)V*%0n  
  CPaintDC dc(this); // device context for painting B#aH\$_U  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); h_~|O [5|)  
  // Center icon in client rectangle R*@[P g*  
  int cxIcon = GetSystemMetrics(SM_CXICON); jBv$^L  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2 1~7{#  
  CRect rect; b%;59^4AjD  
  GetClientRect(&rect); JYd7@Msfc  
  int x = (rect.Width() - cxIcon + 1) / 2; b;L>%;  
  int y = (rect.Height() - cyIcon + 1) / 2; v1r_Z($  
  // Draw the icon )_v\{N  
  dc.DrawIcon(x, y, m_hIcon); )@qup _M@  
 } (a}  
 else P=^#%7J/l  
 { QP%kL*=8  
  CDialog::OnPaint(); 6!B^xm.R@  
 } "PyWo  
} @%<?GNSO  
yvz?4m"_yB  
HCURSOR CCaptureDlg::OnQueryDragIcon() u5Ny=Xm  
{ 5w3ZUmjO  
 return (HCURSOR) m_hIcon; ^$IZLM?E~  
} 14D 7U/zer  
*w/WHQ`xI  
void CCaptureDlg::OnCancel() /u)Rppu  
{ 8rwYNb.P  
 if(bTray) R|1xXDLm*E  
  DeleteIcon(); 0HR|aqPo  
  CDialog::OnCancel(); ck+b/.gw`  
} qon{ g  
tKZ&1E  
void CCaptureDlg::OnAbout() `\jTpDV_W  
{ ISS\uj63M  
 CAboutDlg dlg; ^IGyuj0]jG  
 dlg.DoModal(); %X9b=%'+  
} \V^*44+ <!  
jJVT_8J  
void CCaptureDlg::OnBrowse() &$c5~9p\B  
{ 7':f_]  
 CString str; h}|6VJ@.  
 BROWSEINFO bi; 1s`)yu^`v  
 char name[MAX_PATH]; U,<]J*b(@4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /zG +]  
 bi.hwndOwner=GetSafeHwnd(); gcg>Gjp  
 bi.pszDisplayName=name; i_u {5 U;  
 bi.lpszTitle="Select folder"; 2L2 VVO  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 1n'$Ji7  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); # SQvXMT  
 if(idl==NULL) {y-2  
  return; s=N#CE  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); i-,D_   
 str.ReleaseBuffer(); d=XpO*v,[  
 m_Path=str; dC` tN5  
 if(str.GetAt(str.GetLength()-1)!='\\') _1sMYhI  
  m_Path+="\\"; / Mo d=/e  
 UpdateData(FALSE); Sty! atEWT  
} MBB5wj  
s>|Z7[*  
void CCaptureDlg::SaveBmp() 0e+W/Tq  
{ 3;a R\:p@w  
 CDC dc; ,?g=U8y|  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); e&QS#k  
 CBitmap bm; z2w;oM$g  
 int Width=GetSystemMetrics(SM_CXSCREEN); 'y9*uT~  
 int Height=GetSystemMetrics(SM_CYSCREEN); \sK:W|yy  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 5vTv$2@  
 CDC tdc; (=1q!c`  
 tdc.CreateCompatibleDC(&dc); $n= O  
 CBitmap*pOld=tdc.SelectObject(&bm); 84=-Lw  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); yo'9x s  
 tdc.SelectObject(pOld); X>8-` p  
 BITMAP btm; M$Fth*q{GD  
 bm.GetBitmap(&btm); MO[kr2T  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; N = LM?(H  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9Ct_$.Q .  
 BITMAPINFOHEADER bih; Xb}!0k/{  
 bih.biBitCount=btm.bmBitsPixel; qy_%~c87  
 bih.biClrImportant=0; o+<29o  
 bih.biClrUsed=0; i&`!|X-=R  
 bih.biCompression=0; fVe@YqNa  
 bih.biHeight=btm.bmHeight; .^i<xY  
 bih.biPlanes=1; :l+_ja&o  
 bih.biSize=sizeof(BITMAPINFOHEADER); z%V*K  
 bih.biSizeImage=size; DVI7]+=nV  
 bih.biWidth=btm.bmWidth; ITyzs4"VV  
 bih.biXPelsPerMeter=0; XHsd-  
 bih.biYPelsPerMeter=0; g96T*T  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :peqr!I+K  
 static int filecount=0; naz:A  
 CString name; ^7uX$  
 name.Format("pict%04d.bmp",filecount++); Kax#OYLpg  
 name=m_Path+name; K@HQrv<  
 BITMAPFILEHEADER bfh; \a\= gn   
 bfh.bfReserved1=bfh.bfReserved2=0; U98_M)-%&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ->\N_|_  
 bfh.bfSize=54+size; Ap%O~wA'  
 bfh.bfOffBits=54; fk>l{W}e)  
 CFile bf; Dl%?OG<  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9x=3W?K:,  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); S'o ]=&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); o{V#f_o  
  bf.WriteHuge(lpData,size); b M"fk&  
  bf.Close(); 2MuO*.9D  
  nCount++; ga-{!$b*  
 } tBseqS3<  
 GlobalFreePtr(lpData); a/~29gW8E\  
 if(nCount==1) uPkb, :6~Z  
  m_Number.Format("%d picture captured.",nCount); Gn59 yG!4  
 else CtM'L   
  m_Number.Format("%d pictures captured.",nCount); ]:&n-&@L  
  UpdateData(FALSE); ^'vIOq-1v  
} B7 HQR{t  
>uTPjR[  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [Tb\woU  
{ 3jF|Ic  
 if(pMsg -> message == WM_KEYDOWN) exQ#<x*  
 { &]< 3 ~6n  
  if(pMsg -> wParam == VK_ESCAPE) O)uOUB  
   return TRUE; EJLQ&oH[  
  if(pMsg -> wParam == VK_RETURN) vU!8`x)  
   return TRUE; Z:@6Lv?CN  
 } _gW{gLYyJ  
 return CDialog::PreTranslateMessage(pMsg); )lh8 k {  
} IaLMWoh  
V&i2L.{G)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .+yW%~0  
{ R)+t]}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ R& #tSL  
  SaveBmp(); nUc;/  
  return FALSE; VD$ Eb  
} G2]^F Y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /s|{by`we4  
 CMenu pop; :y# T9R9  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); R"+wih  
 CMenu*pMenu=pop.GetSubMenu(0); o.Oq__>$H  
 pMenu->SetDefaultItem(ID_EXITICON); Nb;H`<JP  
 CPoint pt; 3]/.\(2  
 GetCursorPos(&pt); +TN^NE  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~c* UAowS  
 if(id==ID_EXITICON) T%(C-Quh  
  DeleteIcon(); \"x>JW4w  
 else if(id==ID_EXIT) :)IV!_>'d  
  OnCancel(); -U -P}6^  
 return FALSE; 5M:D?9E+  
} ES}. xZ#~  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \}JrFc%O  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /r^[a,Q#x  
 AddIcon(); b9Y_!Qe  
 return res; -$JO8'TP  
} >w.'KR0L  
`T"rG }c  
void CCaptureDlg::AddIcon() ]^ K;goQv  
{ *HE^1IEl  
 NOTIFYICONDATA data; L8&D(wh/f  
 data.cbSize=sizeof(NOTIFYICONDATA); 8>NwCjN  
 CString tip; !msNEE@[  
 tip.LoadString(IDS_ICONTIP); {%b }Z2  
 data.hIcon=GetIcon(0); Jdj?I'XtY  
 data.hWnd=GetSafeHwnd(); |QMA@Mx  
 strcpy(data.szTip,tip); +Ok%e.\ZM  
 data.uCallbackMessage=IDM_SHELL; 2z_2.0/3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3c#s|qW  
 data.uID=98; XErUS80  
 Shell_NotifyIcon(NIM_ADD,&data); ?Elg?)os  
 ShowWindow(SW_HIDE); V8PLFt;  
 bTray=TRUE; n ~,t QV  
} m\vmY  
pSfYu=#f  
void CCaptureDlg::DeleteIcon() f:woP7FP  
{ @{d\j]Nw  
 NOTIFYICONDATA data; por/^=e{Y  
 data.cbSize=sizeof(NOTIFYICONDATA); mR+Jws'  
 data.hWnd=GetSafeHwnd(); *1A&'T2  
 data.uID=98; a#0;==#  
 Shell_NotifyIcon(NIM_DELETE,&data); 8SC%O\,  
 ShowWindow(SW_SHOW); "aq'R(/`c  
 SetForegroundWindow(); p&N#_dmlH  
 ShowWindow(SW_SHOWNORMAL); oyx^a9  
 bTray=FALSE; x83a!9  
} )oU)}asY  
W5pb;74|  
void CCaptureDlg::OnChange() ^Q.,\TL01  
{ {0v*xL_O^  
 RegisterHotkey(); bwiD$  
} O1P=#l iYX  
qOy=O [+9  
BOOL CCaptureDlg::RegisterHotkey()  L}%dCe  
{ s B 20/F  
 UpdateData(); edvFQ#,d  
 UCHAR mask=0; 7J*N_8?2  
 UCHAR key=0; ]lBGyUJn  
 if(m_bControl) g(hOg~S\E  
  mask|=4; '#\1uXM1U?  
 if(m_bAlt) h<6UC%'ac  
  mask|=2; 2/7_;_#vJ%  
 if(m_bShift) TgfrI  
  mask|=1; \Kav w  
  key=Key_Table[m_Key.GetCurSel()]; ^G1%6\We  
 if(bRegistered){ OCV+h'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); l7}g^\I  
  bRegistered=FALSE; K@u&(}  
 } m:+8J,jW  
 cMask=mask; gfa[4 z  
 cKey=key; `BY&>WY[  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); uQqWew8l+  
 return bRegistered; Pbu{'y3J  
} v?:: |{  
oPQtGl p  
  四、小结 [xZU!=  
)R2XU  
  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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