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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: -w1@!Sdd  
  {:Aw_z:'  
  一、实现方法 =pcF:D#+  
&?0:v`4Y  
  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: s,6`RI%  
y}FZD?"  
#pragma data_seg("shareddata") )KE [!ofD  
HHOOK hHook =NULL; //钩子句柄 |?d#eQ9a  
UINT nHookCount =0; //挂接的程序数目 j%L&jH 6@  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fmfTSN(Q~`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^Dg <Ki  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey CS 8jA\  
static int KeyCount =0; mMSh2B  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 \\06T `  
#pragma data_seg() \P;rES'  
o!OMm!  
  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。 f$.?$  
FS6<V0pil  
  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: +uo{ m~_4  
&gtG~mp<L  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 4[yIOs  
cKey,UCHAR cMask) ?WUF!Jk  
{ +-<}+8G;  
 BOOL bAdded=FALSE; z0%\OhuCcf  
 for(int index=0;index<MAX_KEY;index++){ iYJZvN  
  if(hCallWnd[index]==0){ F(5hmr  
   hCallWnd[index]=hWnd; /P:.qtT(  
   HotKey[index]=cKey; -`b8T0?oK  
   HotKeyMask[index]=cMask; `Out(Hn  
   bAdded=TRUE; IvHh4DU3Z  
   KeyCount++; =-KMb`xT  
   break; 8j5<6Cv_  
  } /ASaB  
 } v>Lm;q(  
 return bAdded; qJPT%r  
} YO+{,$  
//删除热键 ~YP Jez  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &Lm-()wb  
{ 7y^%7U \  
 BOOL bRemoved=FALSE; 0Yl4eB-  
 for(int index=0;index<MAX_KEY;index++){ ^Hrn  ]  
  if(hCallWnd[index]==hWnd){ 6"/WZmOp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $P z`$~  
    hCallWnd[index]=NULL; ^/U27B  
    HotKey[index]=0; vxFTen{-F  
    HotKeyMask[index]=0; @%/]Q<<q  
    bRemoved=TRUE; j}1zdA  
    KeyCount--; "{D6J809  
    break; R=Zn -q  
   } 3S*AxAeg  
  } t?c}L7ht  
 } Rk6deI]  
 return bRemoved; 5U`ZbG  
} oF]cTAqhC.  
[AU II*:}  
`B/0iA  
  DLL中的钩子函数如下: uo\ .7[1  
>Dw~P OMy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^3VR-u<O  
{ = ?D(g  
 BOOL bProcessed=FALSE; tVuWVJ4M  
 if(HC_ACTION==nCode) _"@CGXu  
 { ;0rGiWC#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 'e)^m}:?D  
   switch(wParam) ,`D~py,  
   {  dU)]:>Uz  
    case VK_MENU: H}hFFI)#Oo  
     MaskBits&=~ALTBIT; :bu>],d-8'  
     break; !Ucjax~  
    case VK_CONTROL: b[9&l|y^  
     MaskBits&=~CTRLBIT; Sr?#wev]rn  
     break; qfY5Ww$8  
    case VK_SHIFT: o+w;PP)+=  
     MaskBits&=~SHIFTBIT; Q?b14]6im  
     break; Fm\"{)V:b  
    default: //judge the key and send message in+}/mwfC  
     break; x8Loyt_C  
   } fmqb` %  
   for(int index=0;index<MAX_KEY;index++){ KWAb-yB  
    if(hCallWnd[index]==NULL) 7ELMd{CD  
     continue; {]_uMg#!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;~fT,7qBah  
    { [.se|]t7X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Od+6 -J  
     bProcessed=TRUE; PZxAH9 S?  
    } <+MyZM(z>  
   } ]i(-I <`  
  } L`f^y;Y.  
  else if((lParam&0xc000ffff)==1){ //有键按下 U,#yqER'r  
   switch(wParam) '* mH*?Y  
   { |-sPLU&s%  
    case VK_MENU: F+R?a+e  
     MaskBits|=ALTBIT; kiUGZ^k\s  
     break; :B3[:MpL}  
    case VK_CONTROL: -;f*VM.a  
     MaskBits|=CTRLBIT; FZjHw_pP  
     break; lC:k7<0Ji  
    case VK_SHIFT: |4$M]Mf0  
     MaskBits|=SHIFTBIT; b@RHc!,>jV  
     break; `&\Q +W  
    default: //judge the key and send message theZ]5_C  
     break; L,y6^J!  
   } Z^ }mp@j>  
   for(int index=0;index<MAX_KEY;index++){ infl.  
    if(hCallWnd[index]==NULL) B9p?8.[  
     continue; s { #3r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Uc/+gz Z;  
    { mc=LP>uoS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DPi_O{W>  
     bProcessed=TRUE; U*90m~)  
    } J+rCxn?;g  
   } V5+SWXZ  
  } HhO".GA  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 oFOnjK"|F  
   for(int index=0;index<MAX_KEY;index++){ %ZHP2j %~  
    if(hCallWnd[index]==NULL)  "KcA  
     continue; n>@oBG)!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W3`>8v1?o  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); pv| Pm  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 R$;n)_H  
   } @`\VBW  
  } (&/2\0QV  
 } }VDqj}is  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hW{j\@R  
} *s@Qtgu  
DNGvpKY@  
  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: +`3!I  
V_plq6z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P[s8JDqu  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +P.+_7+:  
^C2\`jLMY  
  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: gV&z2S~"  
+`?Y?L^ J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y*mbjyt[?X  
{ SG6sw]x  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) gZ5[ C  
 { >0Q|nCx  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ~]ZpA-*@Ut  
  SaveBmp(); N !TW!  
  return FALSE; (O0Urm  
 } R|i/lEq  
 …… //其它处理及默认处理 H'Yh2a`!o  
} f/CuE%7BR  
4CGPO c  
o|jIM9/  
  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。 J\ e+}{  
$9?cP`hmi  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 5`f@>r?  
1q;#VS/D;H  
  二、编程步骤 iNMx"F0r  
+V&{*f)  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; o)'y.-@Q  
bH"hX  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {BKl`1z  
\QmCeB  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; IIy~[4dW  
~'R(2[L!;  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; S_~z-`;h!  
qCv20#!"|  
  5、 添加代码,编译运行程序。 >E*$ E  
,o]4?-  
三、程序代码 ?yh}/T\qp  
ZE%YXG  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL =]k {"?j  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 7RZh<A>m  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 0OGCilOb*  
#if _MSC_VER > 1000 ZJlEKib%2  
#pragma once z0/} !  
#endif // _MSC_VER > 1000 Wb S4pdA  
#ifndef __AFXWIN_H__ 1bGopi/  
#error include 'stdafx.h' before including this file for PCH GguFo+YeZ  
#endif 52o x`t|  
#include "resource.h" // main symbols "s\L~R.&  
class CHookApp : public CWinApp 3"F`ZJ]=  
{ $+7`Dy!  
 public: 86z]<p (  
  CHookApp(); $8a(veXd  
  // Overrides *b]; |n{  
  // ClassWizard generated virtual function overrides 2B,] -Mu)  
  //{{AFX_VIRTUAL(CHookApp) dx ;k`r$w  
 public: +iI&c s  
  virtual BOOL InitInstance(); qc-mGmomL  
  virtual int ExitInstance(); OQ9x*TmK  
  //}}AFX_VIRTUAL M,ir`"s  
  //{{AFX_MSG(CHookApp)  C:G8c[  
  // NOTE - the ClassWizard will add and remove member functions here. %Q!`NCe+[  
  // DO NOT EDIT what you see in these blocks of generated code ! 1h.)#g?{  
  //}}AFX_MSG }.z&P'  
  DECLARE_MESSAGE_MAP()  [~&XL0  
}; fHZTXvxoL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); n`4K4y%Dy}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w |l1'   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KM`eIw>8  
BOOL InitHotkey(); }2ZsHM^]%  
BOOL UnInit(); Oh4AsOj@  
#endif `c'W-O/  
Yq/.-4 y  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.  YBnA+l*  
#include "stdafx.h" itzyCw2|#  
#include "hook.h" <7Ae-!>x  
#include <windowsx.h> IJ/sX_k  
#ifdef _DEBUG e${)w-R/e  
#define new DEBUG_NEW }W ^: cp  
#undef THIS_FILE ~b:Rd{  
static char THIS_FILE[] = __FILE__; T 6~_Q}6  
#endif JAI)Eqqv]  
#define MAX_KEY 100  aH#l9kCb  
#define CTRLBIT 0x04 bMU(?hb  
#define ALTBIT 0x02 z~A]9|/61v  
#define SHIFTBIT 0x01 @JRNb=?a  
#pragma data_seg("shareddata") 3"{.37Q  
HHOOK hHook =NULL; ~xoF6 CF  
UINT nHookCount =0; 77Bgl4P  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey pFJB'=c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT k#5}\w!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey c5mZG7-  
static int KeyCount =0; U"50_O  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift w;l<[q?_  
#pragma data_seg() [b$4Shx  
HINSTANCE hins; aj}(E +  
void VerifyWindow(); *OyHHq|>q  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) pD&& l!i&[  
//{{AFX_MSG_MAP(CHookApp) (#;`"Yu  
// NOTE - the ClassWizard will add and remove mapping macros here. YTw#J OO  
// DO NOT EDIT what you see in these blocks of generated code! Ve 4u +0  
//}}AFX_MSG_MAP Jnv@.  
END_MESSAGE_MAP() 1 1cWy+8D  
?)\a_ Tn  
CHookApp::CHookApp() ]Ta N{"  
{ hxS 6:5Uc  
 // TODO: add construction code here, r$wxk 4%Rz  
 // Place all significant initialization in InitInstance AdWq Q  
} +\r+n~w  
uWrQ&}@  
CHookApp theApp; D0N9Ksq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `N5|Ho*C  
{ D?Ux[Ozb  
 BOOL bProcessed=FALSE; Ig5L$bAM~  
 if(HC_ACTION==nCode) fJWC)E  
 { q5 L51KP2  
  if((lParam&0xc0000000)==0xc0000000){// Key up pc?>cs8  
   switch(wParam) pZU9^Z?~6  
   { wK}\_2?  
    case VK_MENU: V:G>G'Eh0  
     MaskBits&=~ALTBIT; eW>3XD4  
     break; {%#)5l)  
    case VK_CONTROL: *~/OOH$"  
     MaskBits&=~CTRLBIT; sZLT<6_B  
     break; nQ GQWg`  
    case VK_SHIFT: &* E+N[  
     MaskBits&=~SHIFTBIT; !s@Rok  
     break; d`1I".y  
    default: //judge the key and send message Y-0?a?q2Fr  
     break; wW"z  
   } X<R?uI?L  
   for(int index=0;index<MAX_KEY;index++){ #Eb5:;  
    if(hCallWnd[index]==NULL) ",)Qc!^P$  
     continue; 2[gFkyqe  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N D<HXO  
    { |7#[ (%D!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); iX\W;V  
     bProcessed=TRUE; 1EyL#;k  
    } #Mg]GeDJ{  
   } &[&r2 >a  
  } A_;8IlW  
  else if((lParam&0xc000ffff)==1){ //Key down 0 P[RyQI  
   switch(wParam) '<0J@^vZ  
   { TO-$B8*nq  
    case VK_MENU: fo4.JyBk  
     MaskBits|=ALTBIT; n$[f94d=  
     break; eh[_~>w  
    case VK_CONTROL: cJgBI(S5  
     MaskBits|=CTRLBIT; "6a8s;  
     break; 4^<6r*  
    case VK_SHIFT: Er k?}E  
     MaskBits|=SHIFTBIT; "z<azs  
     break; oDcKtB+2  
    default: //judge the key and send message +`uY]Q ,O  
     break; a=TG[* s  
   } GjB]KA^  
   for(int index=0;index<MAX_KEY;index++) }CxvT`/  
   { k0Ek:MjJr  
    if(hCallWnd[index]==NULL) B-d(@7,1  
     continue; +PK6-c\r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) irk*~k ?  
    { e5Mln!.o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d`d0 N5\  
     bProcessed=TRUE; W9oAjO NE  
    } 8^B;1`#  
   } ~ 7)A"t  
  } saD-D2oj  
  if(!bProcessed){ Dr;iQkGP  
   for(int index=0;index<MAX_KEY;index++){ MlW 8t[  
    if(hCallWnd[index]==NULL) =e?$M  
     continue; Z2"? &pKV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) dC}`IR  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /=?ETth @  
   } U.T|   
  } XR0O;JN  
 } S-+M;@'Rl  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); gK|R =J  
} O--7<Q\  
IaFr&  
BOOL InitHotkey() ;W:6{9m ze  
{ oVCmI"'  
 if(hHook!=NULL){ I?Q+9Rmm`J  
  nHookCount++; fa.0I~  
  return TRUE; F>gmj'-^  
 } V^Rkt%JY  
 else tZ2e!<C  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); D@X+{  
  if(hHook!=NULL) /XS&d%y  
   nHookCount++; /(t sb  
  return (hHook!=NULL); IF*&%pB  
} _y .]3JNm  
BOOL UnInit() M2@^bB\J  
{ 5.tvB  
 if(nHookCount>1){ Tp<k<uKD  
  nHookCount--; xv7"WFb  
  return TRUE; ;3C:%!CdA]  
 } B pLEPuu30  
 BOOL unhooked = UnhookWindowsHookEx(hHook); TFDm5XJ  
 if(unhooked==TRUE){ K t#,]]  
  nHookCount=0; DG;y6#|p  
  hHook=NULL; VhEMk\  
 } ,)~E>[=+  
 return unhooked; [&Hkn5yq  
} f c6g  
>uJ/TQU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x O7IzqY  
{ rsa&Oo D>  
 BOOL bAdded=FALSE; )R{UXk3q}  
 for(int index=0;index<MAX_KEY;index++){ jw6Tj;c  
  if(hCallWnd[index]==0){ O7aLlZdg~  
   hCallWnd[index]=hWnd; u1K\@jlw  
   HotKey[index]=cKey; ^Jp*B;  
   HotKeyMask[index]=cMask; U\+&cob.  
   bAdded=TRUE; 5+X_4lEJK(  
   KeyCount++; c#xP91.m  
   break; D&hqV)d4R  
  } Y|0ow_oH  
 } u~Tg&0V30  
 return bAdded; 9h(IUD{8  
} ;mAhY  
2Ohp]G  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kpob b  
{ -T/W:-M(  
 BOOL bRemoved=FALSE; 9>,Qgp,w  
 for(int index=0;index<MAX_KEY;index++){ wz -)1!  
  if(hCallWnd[index]==hWnd){ j nwQV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ n<V1|X  
    hCallWnd[index]=NULL; )"O{D`uX  
    HotKey[index]=0; POU}/e!Ua  
    HotKeyMask[index]=0; nq`q[KV:  
    bRemoved=TRUE; {,O`rW_eS  
    KeyCount--; igDyp0t  
    break; <xS=#  
   } >HkhAJhW  
  } qJ[@:&:  
 } h5@j`{  
 return bRemoved; #w3ru6*W  
} rcbP$t vz  
]jM^Z.mI+  
void VerifyWindow() a5`eyL[f  
{ q"aPJ0ni'  
 for(int i=0;i<MAX_KEY;i++){ |9NIGg'n  
  if(hCallWnd!=NULL){ dU;upS_-  
   if(!IsWindow(hCallWnd)){ r25Z`X Z  
    hCallWnd=NULL; K^i"9D)A  
    HotKey=0; u39FN?<^  
    HotKeyMask=0; ! gp}U#Yv  
    KeyCount--; <lFY7' aY  
   } oP$kRfXS!<  
  } .L;",E  
 } ~oi_r8 K  
} A1JzW)B  
z<a2cQ?XQ  
BOOL CHookApp::InitInstance() cNP/<8dq  
{ LC'F<MpM  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); lpEDPvD_Vm  
 hins=AfxGetInstanceHandle(); dm^H5D/A  
 InitHotkey(); Lk(S2$)*  
 return CWinApp::InitInstance(); Kd{#r/HZ  
} }V^e7d  
cCng5Nq,c  
int CHookApp::ExitInstance() >C2HC6O3  
{ Y-&|VE2  
 VerifyWindow(); Q#rt<S1zW  
 UnInit(); d/B*  
 return CWinApp::ExitInstance(); =WRO\lgv.  
} #Go(tS~o  
2YIF=YWO},  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file tBl#o ^  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +L6" vkz  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ EX 9Z{xX  
#if _MSC_VER > 1000 =K6c;  
#pragma once Es:6  
#endif // _MSC_VER > 1000 .;%q/hP  
g5TkD~w"  
class CCaptureDlg : public CDialog J8h7e}n?  
{  [`bZ5*&  
 // Construction "z/V%ZK~f  
 public: e-!?[Ujv*%  
  BOOL bTray; 5&|5 a} 8  
  BOOL bRegistered; fIEw(k<*  
  BOOL RegisterHotkey(); A5+5J_)*  
  UCHAR cKey; C*j9Iaj  
  UCHAR cMask; WJcVQM s  
  void DeleteIcon(); kC|Tubs(  
  void AddIcon(); E.#6;HHzN  
  UINT nCount; Z%;)@0~f  
  void SaveBmp(); r:#Q9EA  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ??+:vai2  
  // Dialog Data W2n*bNI  
  //{{AFX_DATA(CCaptureDlg) 4zX=3iBt  
  enum { IDD = IDD_CAPTURE_DIALOG }; e7's)C>/'  
  CComboBox m_Key; .S6ji~;r  
  BOOL m_bControl; wEK%T P4  
  BOOL m_bAlt; _]Ey Ea  
  BOOL m_bShift; )DRkS,I  
  CString m_Path; DOT=U _  
  CString m_Number; Za9$Hh/X  
  //}}AFX_DATA U%n,XOJ  
  // ClassWizard generated virtual function overrides (qj,GmcS  
  //{{AFX_VIRTUAL(CCaptureDlg) i9y3PP)  
 public: Wv NI=>  
  virtual BOOL PreTranslateMessage(MSG* pMsg); km}MqBQl  
 protected: CX.SYr&!R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v#Sj|47  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >.n;mk  
  //}}AFX_VIRTUAL \P5>{ 2i  
  // Implementation ?'Oj=k"c7  
 protected: p}&Md-$1  
  HICON m_hIcon; "'~|}x1Uv  
  // Generated message map functions }D Z)W0RDe  
  //{{AFX_MSG(CCaptureDlg) W?=$V>)  
  virtual BOOL OnInitDialog(); ;Na^]32  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); d4% `e&K]'  
  afx_msg void OnPaint(); ]L$4P y  
  afx_msg HCURSOR OnQueryDragIcon(); h)^dB,~  
  virtual void OnCancel(); (Hl8U  
  afx_msg void OnAbout(); p %L1uwLG  
  afx_msg void OnBrowse(); ZWFG?8lJ  
  afx_msg void OnChange(); ;m' '9z)2  
 //}}AFX_MSG \WiqN*ZF  
 DECLARE_MESSAGE_MAP() nW~$ (Qnd  
}; u]P03B  
#endif 0hFH^2%UY  
l 4!kxXf-<  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file !O 4<I_EY{  
#include "stdafx.h" (1rJFl!  
#include "Capture.h" B>sCP"/uV  
#include "CaptureDlg.h" q Frt^+@  
#include <windowsx.h> phr2X*Z/)Y  
#pragma comment(lib,"hook.lib") H_Iim[v#  
#ifdef _DEBUG 1B6C<cL:sU  
#define new DEBUG_NEW R!@|6=]iG  
#undef THIS_FILE Wgav>7!9  
static char THIS_FILE[] = __FILE__; R$Zv0a&  
#endif pF|8OB%  
#define IDM_SHELL WM_USER+1 |3S'8Oe CI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0{-`Th+h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `0Yt1Z&  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; iD.0J/  
class CAboutDlg : public CDialog y+?=E g  
{ "Ys_ \  
 public: K?9WY ]Ot  
  CAboutDlg(); T_uNF8Bh  
  // Dialog Data f( ]R/'o  
  //{{AFX_DATA(CAboutDlg) zwMQXI'k83  
  enum { IDD = IDD_ABOUTBOX }; ri"?, }(  
  //}}AFX_DATA ~l(G6/R  
  // ClassWizard generated virtual function overrides Lwp-2`%  
  //{{AFX_VIRTUAL(CAboutDlg) sk~za  
 protected: D}mo\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r4 9UJE  
  //}}AFX_VIRTUAL mgo'MW\   
  // Implementation F#jCEq  
 protected: chKF6n  
  //{{AFX_MSG(CAboutDlg) FTbT9   
  //}}AFX_MSG ^Vl^,@  
  DECLARE_MESSAGE_MAP() mG>T`c|r3  
}; xR0~S 3caI  
jA A'h A  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) RcY6V_Qx  
{ 9+]ZH.(YE  
 //{{AFX_DATA_INIT(CAboutDlg) qRgK_/[]  
 //}}AFX_DATA_INIT pZc9q8j3  
} !8wZw68"  
D9}d]9]$  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) uOyLC<I/  
{ bq c;.4$  
 CDialog::DoDataExchange(pDX); 6>@(/mh*  
 //{{AFX_DATA_MAP(CAboutDlg) H%*~l  
 //}}AFX_DATA_MAP 2v"wWap-+  
} &z./4X  
xnl<<}4pJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) p6<E=5RRd1  
 //{{AFX_MSG_MAP(CAboutDlg) 3{.9O$  
 // No message handlers 6&i[g  
 //}}AFX_MSG_MAP /uy&2l  
END_MESSAGE_MAP() ph Wc 8[Q  
VFe-#"0ZO  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ZrmnQ  
: CDialog(CCaptureDlg::IDD, pParent) ;yRwoTc)Y  
{ u+%)JhIp  
 //{{AFX_DATA_INIT(CCaptureDlg) ;s}-X_O<  
  m_bControl = FALSE; /V#MLPA  
  m_bAlt = FALSE; ~@b9  
  m_bShift = FALSE; FiV^n6-F`  
  m_Path = _T("c:\\"); sq8tv]  
  m_Number = _T("0 picture captured."); rnzsfr-|(2  
  nCount=0; E'S<L|A/  
  bRegistered=FALSE; UMHuIA:%U  
  bTray=FALSE; ]=$-B  
 //}}AFX_DATA_INIT +=n x|:no  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 iqU.a/~y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +^^S'mP8  
} \GjXsR*b5  
7?kXgR[#d  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) LM'*OtpDG  
{ !Szgph"ul  
 CDialog::DoDataExchange(pDX); M]8eW  
 //{{AFX_DATA_MAP(CCaptureDlg) +1JZB* W  
  DDX_Control(pDX, IDC_KEY, m_Key); Apw-7*/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ZI#SYEF6  
  DDX_Check(pDX, IDC_ALT, m_bAlt); `4"y#Z  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); x|~D(zo  
  DDX_Text(pDX, IDC_PATH, m_Path); MkluK=$  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (&N$W&  
 //}}AFX_DATA_MAP 8KtF<`A)  
} |-cALQ  
Y(Z(dV!Po  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +e{djp@m  
//{{AFX_MSG_MAP(CCaptureDlg) EF_h::A_  
 ON_WM_SYSCOMMAND() Z3u""oM/  
 ON_WM_PAINT() g,z&{pZch  
 ON_WM_QUERYDRAGICON() _If@#WnoyA  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) nKZRq&~^E  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]0/~6f  
 ON_BN_CLICKED(ID_CHANGE, OnChange) <O`q3u'l  
//}}AFX_MSG_MAP YA8yMh*4D?  
END_MESSAGE_MAP() 7W>}7  
OFPd6,(E  
BOOL CCaptureDlg::OnInitDialog() R&-W_v+  
{ `OF ;>u*:  
 CDialog::OnInitDialog(); &bOodkOb  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Do{*cSd  
 ASSERT(IDM_ABOUTBOX < 0xF000); cbg3bi  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ggYIq*4  
 if (pSysMenu != NULL) w~FO:/  
 { hc4`'r;  
  CString strAboutMenu; y(p:)Iv  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,_X,V!  
  if (!strAboutMenu.IsEmpty()) 0,i+  
  { }O-%kl  
   pSysMenu->AppendMenu(MF_SEPARATOR); (WU~e!}  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A$Jn3Xd~!  
  } 94>7-d  
 } Pq_ApUZa  
 SetIcon(m_hIcon, TRUE); // Set big icon Y;F,GxR}  
 SetIcon(m_hIcon, FALSE); // Set small icon uJAB)ti2I  
 m_Key.SetCurSel(0); %/,Uk+3p  
 RegisterHotkey(); -QHzf&D?  
 CMenu* pMenu=GetSystemMenu(FALSE); {<V|Gr  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); |GLn 9vw7S  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^/RM;`h0  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Gm?"7R.  
 return TRUE; // return TRUE unless you set the focus to a control -:1Gr8  
} $@ #G+QQ_  
C(Ba r#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam)  3kzGL  
{ $AJy^`E^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) cqU/Y_%l'  
 { *~aI>7H  
  CAboutDlg dlgAbout; :ftyNaq'  
  dlgAbout.DoModal(); l9Cy30O6  
 } :r|P?;t(  
 else ovRCF(Og,  
 { C@:N5},]  
  CDialog::OnSysCommand(nID, lParam); :$@zX]?M  
 } uX 5B>32  
} 'bqf?3W  
OsuSx^}  
void CCaptureDlg::OnPaint() oGjYCVc  
{ ="PywZ  
 if (IsIconic()) !"qEB2r  
 { F u=VY{U4  
  CPaintDC dc(this); // device context for painting (TK cSVR  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); O9 r44ww  
  // Center icon in client rectangle `1}yB  
  int cxIcon = GetSystemMetrics(SM_CXICON); l~ >rpG  
  int cyIcon = GetSystemMetrics(SM_CYICON); L?5t <`#lw  
  CRect rect; :zTj"P>"I  
  GetClientRect(&rect); m3ZOq B-  
  int x = (rect.Width() - cxIcon + 1) / 2; PzG:M7  
  int y = (rect.Height() - cyIcon + 1) / 2; <L[)P{jn?p  
  // Draw the icon ]$X=~>w  
  dc.DrawIcon(x, y, m_hIcon); ntUVhIE0  
 } [+2^n7R  
 else Wa<NId  
 { .St h  
  CDialog::OnPaint(); qdnNapWnc  
 } /]UNN~(  
} o`]FH _  
x~I1(l7r  
HCURSOR CCaptureDlg::OnQueryDragIcon() 2/NWWoKw  
{ ojI"<Q~g  
 return (HCURSOR) m_hIcon; Tl{r D(D  
} K*D]\/;^  
^hTJp{  
void CCaptureDlg::OnCancel() ZI*A0_;L  
{ Fgq*3t  
 if(bTray) ~w% +y  
  DeleteIcon(); \YyU5f7';  
  CDialog::OnCancel(); biuo.OG]  
} @k;3$  
U*l>8  
void CCaptureDlg::OnAbout() 0To 5|r  
{ DdW8~yI&  
 CAboutDlg dlg; ?n~j2-[<  
 dlg.DoModal(); ~H."{  
} )O'<jwp$  
yL,B\YCf8  
void CCaptureDlg::OnBrowse() z{_Vn(Kg   
{ rx) Q]  
 CString str;  X0L{#U  
 BROWSEINFO bi; $VNn`0^gF  
 char name[MAX_PATH]; 6XqO' G  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); zL}DLfy>R  
 bi.hwndOwner=GetSafeHwnd(); ZPog)d@!  
 bi.pszDisplayName=name; cM Kh+r  
 bi.lpszTitle="Select folder"; Wx`IEPsVbk  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?NeB_<dLa`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 7]53GGNO  
 if(idl==NULL) G*V 7*KC  
  return; |EA1+I.&x  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); _JB3+0@  
 str.ReleaseBuffer(); \}c50}#0  
 m_Path=str; D]y.!D{l2  
 if(str.GetAt(str.GetLength()-1)!='\\') 1.CYs<  
  m_Path+="\\"; l;i u`  
 UpdateData(FALSE); )]Rr:i9n  
} s_ $@N!  
5T*7HC[  
void CCaptureDlg::SaveBmp() -': tpJk  
{ cFo-NI2  
 CDC dc; $80/ub:R  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); eGg#=l=  
 CBitmap bm; \6L=^q=  
 int Width=GetSystemMetrics(SM_CXSCREEN); WR%iUO40  
 int Height=GetSystemMetrics(SM_CYSCREEN); b9jm= U  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =@ RVLml  
 CDC tdc; efm<bJB2  
 tdc.CreateCompatibleDC(&dc); =0|evC  
 CBitmap*pOld=tdc.SelectObject(&bm); ponvi42u  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); NmXTk+,L#  
 tdc.SelectObject(pOld); /vKDlCH*  
 BITMAP btm; 6IH^rSUSK  
 bm.GetBitmap(&btm); L"0L_G  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; j/\XeG>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [0emOS  
 BITMAPINFOHEADER bih;  73X]|fy  
 bih.biBitCount=btm.bmBitsPixel; {,ljIhc,  
 bih.biClrImportant=0; I._=q  
 bih.biClrUsed=0; 0v?,:]A0E  
 bih.biCompression=0; WF7RMQ51j  
 bih.biHeight=btm.bmHeight; cE[lB08  
 bih.biPlanes=1; |SmN.*&(9  
 bih.biSize=sizeof(BITMAPINFOHEADER);  '}=M~  
 bih.biSizeImage=size; 2I  
 bih.biWidth=btm.bmWidth; |9h[Q[m  
 bih.biXPelsPerMeter=0; $Z4p$o dk  
 bih.biYPelsPerMeter=0; ] Yy Sf  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Syb:i(Y  
 static int filecount=0; |qD<h  
 CString name; '1+ Bgf  
 name.Format("pict%04d.bmp",filecount++); 53c6dl  
 name=m_Path+name; e;$s{CNo  
 BITMAPFILEHEADER bfh; 5sH ee,  
 bfh.bfReserved1=bfh.bfReserved2=0; IM+PjYJ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); G[mYx[BTz  
 bfh.bfSize=54+size; FVHL;J]nf1  
 bfh.bfOffBits=54; 9b0Z Ey{  
 CFile bf; sq%f%?(V  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ F&Gb[Q&a8  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); U"Y$7~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); S/4k fsN  
  bf.WriteHuge(lpData,size); bF.Aj8ZQ  
  bf.Close(); Ok@5`?08  
  nCount++; )-mB^7uXGv  
 } _Cxs"to  
 GlobalFreePtr(lpData); 9M6&+1XE  
 if(nCount==1) .IqS}Rh  
  m_Number.Format("%d picture captured.",nCount); `fH6E8N  
 else lxeolDl  
  m_Number.Format("%d pictures captured.",nCount); 1DX=\BWp  
  UpdateData(FALSE); IpWl;i`__  
} C-(&zwj?!  
5 Z@Q ^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <(v!Xj^yO  
{ @!S5FOXipZ  
 if(pMsg -> message == WM_KEYDOWN) ,T]okN5uI  
 { Dbgw )n*2  
  if(pMsg -> wParam == VK_ESCAPE) 7-^d4P+|g  
   return TRUE; :KQ<rLd  
  if(pMsg -> wParam == VK_RETURN) N;htKcZ  
   return TRUE; iZ{D_uxq  
 } *StJ5c_kg2  
 return CDialog::PreTranslateMessage(pMsg); M8h9i2  
} NTV0DkX  
wm}i+ApK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @~"0|,6VC  
{ qZ4DO*%b3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3h4>edM  
  SaveBmp(); 6s6[sUf=l&  
  return FALSE; |')Z;  
} rn(T Z}  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ NEX\+dtE~0  
 CMenu pop; :wIbKs.r  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +;vfn>^!b  
 CMenu*pMenu=pop.GetSubMenu(0); j}y"  
 pMenu->SetDefaultItem(ID_EXITICON); K\uR=L7  
 CPoint pt; #q%&,;4  
 GetCursorPos(&pt); u|+O%s TQ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); X@ TQD  
 if(id==ID_EXITICON) [ z?<'Tj  
  DeleteIcon(); #SO9e.yhI  
 else if(id==ID_EXIT) |W?x6]~.R  
  OnCancel(); |S/nq_g]  
 return FALSE; :=-h'<D  
} )jn xR${M  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); GR/ p%Y(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) NJ3b Oq  
 AddIcon(); CT/`Kg_  
 return res; "S1+mSW>  
} ucyxvhH^-  
gg933TLu(Q  
void CCaptureDlg::AddIcon() H Jwj,SL  
{ 9kTU|py  
 NOTIFYICONDATA data; h T4fKc7P  
 data.cbSize=sizeof(NOTIFYICONDATA); A07FjT5w8  
 CString tip; &Jq?tnNd  
 tip.LoadString(IDS_ICONTIP); o[_ {\  
 data.hIcon=GetIcon(0); kZfO`BVL  
 data.hWnd=GetSafeHwnd(); !YCYmxw#  
 strcpy(data.szTip,tip); jytfGE:  
 data.uCallbackMessage=IDM_SHELL; Y*J,9  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Y8(g8RN  
 data.uID=98; [@Y?'={qE  
 Shell_NotifyIcon(NIM_ADD,&data); $kg!XT{ V  
 ShowWindow(SW_HIDE); c/b} 39X  
 bTray=TRUE; )0YMi!&j`  
} s<tdn[d  
flnoK%wi  
void CCaptureDlg::DeleteIcon() UfXqcyY(  
{ yPKeatH]  
 NOTIFYICONDATA data; S'lZ'H/  
 data.cbSize=sizeof(NOTIFYICONDATA); o^biO!4,  
 data.hWnd=GetSafeHwnd(); &*r YY\I  
 data.uID=98; *o`bBdZ  
 Shell_NotifyIcon(NIM_DELETE,&data); c=h{^![$  
 ShowWindow(SW_SHOW); u9_ Fjm}&  
 SetForegroundWindow(); !Hxx6/  
 ShowWindow(SW_SHOWNORMAL); zq8LQ4@ay  
 bTray=FALSE; y.HE3tH  
} Bzw~OB{!=J  
RKx" }<#+  
void CCaptureDlg::OnChange() {b}Ri&oEOH  
{ )L<NW{  
 RegisterHotkey(); <%B sb}h,  
} eE '\h  
,)[u<&  
BOOL CCaptureDlg::RegisterHotkey() r1}YN<+,s  
{ aTxss:7]  
 UpdateData(); $~75/  
 UCHAR mask=0; C5c@@ch :  
 UCHAR key=0; P|Dw +lQj  
 if(m_bControl) r8A   
  mask|=4; KC[ql}JP  
 if(m_bAlt) 79^Y^.D  
  mask|=2; g ]e^;  
 if(m_bShift) 4$oNh)+/h  
  mask|=1; [Abq("9p\  
  key=Key_Table[m_Key.GetCurSel()]; d,tGW  
 if(bRegistered){ Z%E;*R2+:>  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); J^m#984  
  bRegistered=FALSE; MqDz cB]  
 } W2?6f:  
 cMask=mask; G>& Tap>  
 cKey=key; |qnAqzK|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); c07'mgsU  
 return bRegistered; % put=I  
} ">_<L.,I  
ND $m|V-C  
  四、小结 NCR 4n_  
+m8CN(c  
  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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