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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: i2-]Xl  
  ,zdK%V}  
  一、实现方法 oTr,zRL  
e.Q'l/g  
  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: ;iQw2XhT  
y-S23B(  
#pragma data_seg("shareddata") \?|^w.  
HHOOK hHook =NULL; //钩子句柄 0g Hd{H=  
UINT nHookCount =0; //挂接的程序数目 @i#=1)Ze  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 |+Z-'k~Q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 IsVR4t]  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey YS<KyTb"  
static int KeyCount =0; }9N-2]  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 W"\+jHF"  
#pragma data_seg() of >  
=L;g:hc<  
  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。 7mn&w$MS4:  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: C0khG9,BL  
7W+{U0 2O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR '}OAl  
cKey,UCHAR cMask) iG"1~/U  
{ E_P,>f  
 BOOL bAdded=FALSE; Pj*]%V  
 for(int index=0;index<MAX_KEY;index++){ |h&okR+_,  
  if(hCallWnd[index]==0){ JUJrtK S  
   hCallWnd[index]=hWnd; 32pPeYxB!-  
   HotKey[index]=cKey; bxWzm|  
   HotKeyMask[index]=cMask; K.Cx 9  
   bAdded=TRUE; [#AI!-  
   KeyCount++; 7\H_9o0$  
   break; =B`=f,,#3  
  } WpMm%G~'4t  
 } '5A&c(  
 return bAdded; _bv9/#tR  
} z uo:yaO  
//删除热键  B`vC>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @PK 1  
{ iQgr8[ SFf  
 BOOL bRemoved=FALSE; + (`.pa z@  
 for(int index=0;index<MAX_KEY;index++){ %WqUZ+yy  
  if(hCallWnd[index]==hWnd){ vrh2}biCR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ U.=TjCW  
    hCallWnd[index]=NULL; U} Pr1  
    HotKey[index]=0; B7S)L#l_\  
    HotKeyMask[index]=0; mi@uX@ #  
    bRemoved=TRUE; iszVM  
    KeyCount--; S2 P9C"  
    break; LaL{ ^wP  
   } rKTc 6h:)  
  } y>cT{)E$  
 } -vh\XO  
 return bRemoved; mR#"ng  
} @Hr1.f  
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  DLL中的钩子函数如下: e5w0}/yW/  
[Kb)Q{=)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %/}d'WJR  
{ d6zq,x!cI  
 BOOL bProcessed=FALSE; %][zn$aa|  
 if(HC_ACTION==nCode) 9U@>&3[v  
 { <W^>:!?w  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^e80S^  
   switch(wParam) j#l1KO^y  
   {  fF5\\_,  
    case VK_MENU: "y ;0}9]n1  
     MaskBits&=~ALTBIT; K]^Jl0  
     break; XAB/S8e  
    case VK_CONTROL: 7{VN27Fa_  
     MaskBits&=~CTRLBIT; _Om5w p=:  
     break; R-2Aby ts2  
    case VK_SHIFT: d7Z$/ $  
     MaskBits&=~SHIFTBIT; I]Z"?T  
     break; 2Y;iqR  
    default: //judge the key and send message a!&m\+?  
     break; |T*t3}  
   } dd@ D s  
   for(int index=0;index<MAX_KEY;index++){ vtzbF1?O  
    if(hCallWnd[index]==NULL) 3=0b  
     continue; UY)Iu|~0b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :Z6l)R+V  
    { }!WuJz"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (%fSJCBl[P  
     bProcessed=TRUE; `0=j,54cx  
    } N*KM6j  
   } " "CNw-^t  
  } BtQqUk#L2  
  else if((lParam&0xc000ffff)==1){ //有键按下 L f;Uv[^c  
   switch(wParam) |9)y<}c5oM  
   { _1jeaV9@  
    case VK_MENU: K~qKr<)  
     MaskBits|=ALTBIT; w3Dqpo8E  
     break; 0{stIgB$  
    case VK_CONTROL: g&/r =U  
     MaskBits|=CTRLBIT; -(E-yC u  
     break; Q.f D3g  
    case VK_SHIFT: +X>Aj=#  
     MaskBits|=SHIFTBIT; HzZX=c  
     break; WVx^}_FD0  
    default: //judge the key and send message & 5'cN  
     break; /vqsp0e"H  
   } 3B4C@ {  
   for(int index=0;index<MAX_KEY;index++){ xfqU atC  
    if(hCallWnd[index]==NULL) zB6&),[,v  
     continue; 9"dZ4{\!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) //#]CsFiP  
    { !!])~+4pP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d81[hT}q  
     bProcessed=TRUE; h|EHK!<"8  
    } x`K"1E{2  
   } '~xjaa;.  
  } :ZXaJ!  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7[M@;$  
   for(int index=0;index<MAX_KEY;index++){ z~jk_|?|?  
    if(hCallWnd[index]==NULL) &qm:36Y7Xg  
     continue; Eq5X/Hx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0}\8,U  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); k[1w] l8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 {dvsZJj  
   } .Txwp?};  
  } eM^Y  
 } nwJc%0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ? Lr:>  
} l YjPrA]TC  
KwxJ{$|xH  
  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: )u307Lg  
+4k4z:<n  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?T>NvKF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  s)9 sb J  
:(4];Va  
  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: i6k~j%0m  
o H]FT{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ::Pf\Lb>  
{ sP%J`L@h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Rm@F9D[,  
 { @SAJ*h fb0  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 JL?|NV-  
  SaveBmp(); ]iaQD _'\  
  return FALSE; (9+N_dLx~P  
 } r6e!";w:U  
 …… //其它处理及默认处理 ZRC7j?ui8`  
} 4Gsq)i17j  
S{~j5tQv^q  
U,,rB(  
  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。 ,fyqa  
t=dZM}wj_\  
  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。 $# b  
zi,":KDz#  
  二、编程步骤 qjIcRue'"  
TA+/35^?  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; <}AmzeHr+  
OJ}aN>k  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; mtNB09E(  
62>/0_m5  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; L$}'6y/@  
oRl@AhS  
  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; @Hst-H.l<l  
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  5、 添加代码,编译运行程序。 BWsD~Ft  
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三、程序代码 @C5 %`{\  
4,ewp coC%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL s;:quM  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 4?~Ei[KgQn  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ d6"B_,*b  
#if _MSC_VER > 1000 E>qehs,g  
#pragma once B zr}+J  
#endif // _MSC_VER > 1000 58/\  
#ifndef __AFXWIN_H__ 2Zw]Uu`sb  
#error include 'stdafx.h' before including this file for PCH suZ`  
#endif /S%!{;:  
#include "resource.h" // main symbols |r53>,oR<:  
class CHookApp : public CWinApp 6 ZVD<C:\  
{ |( R[5q  
 public: ZRCUM"R_  
  CHookApp(); %l)~C%T  
  // Overrides r A9Rz^;xa  
  // ClassWizard generated virtual function overrides 9!Vp-bo  
  //{{AFX_VIRTUAL(CHookApp) `O}bPwa{>  
 public: '8fh(`  
  virtual BOOL InitInstance(); 'a enh j  
  virtual int ExitInstance(); K?mly$  
  //}}AFX_VIRTUAL QK`2^  
  //{{AFX_MSG(CHookApp) QEl~uhc3  
  // NOTE - the ClassWizard will add and remove member functions here. H3q L&xL  
  // DO NOT EDIT what you see in these blocks of generated code ! :,=Z)e  
  //}}AFX_MSG & /lmg!6  
  DECLARE_MESSAGE_MAP() /M~rmIks  
}; p2o6 6t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); IR*:i{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xqaw00,s  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hin6cac  
BOOL InitHotkey(); *wJ'Z4_5F  
BOOL UnInit(); 2N_9S?a3sK  
#endif ^ px)W,O  
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//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. IN94[yW{1  
#include "stdafx.h" ~7&O[  
#include "hook.h" 58_aI?~>>  
#include <windowsx.h> ki|w?0s  
#ifdef _DEBUG j_~lc,+m  
#define new DEBUG_NEW '#x<Fo~hT  
#undef THIS_FILE Q$DF3[NC  
static char THIS_FILE[] = __FILE__; k3t2{=&'&x  
#endif [0hZg  
#define MAX_KEY 100 gc{5/U9H*  
#define CTRLBIT 0x04 DX#F]8bWl  
#define ALTBIT 0x02 %q,^A+=  
#define SHIFTBIT 0x01 j~rarR@NB)  
#pragma data_seg("shareddata") }sS1 p6z  
HHOOK hHook =NULL; WnC0T5S?U  
UINT nHookCount =0; f= l*+QY8f  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~b{j`T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT u+uu?.bM  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey auQfWO[ u  
static int KeyCount =0; vW4N[ .+  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \Rvsy;7  
#pragma data_seg() 8rsv8OO  
HINSTANCE hins; j<* `?V^  
void VerifyWindow(); 64qQ:D7C  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Yg14aKZl  
//{{AFX_MSG_MAP(CHookApp) MEn#MT/Cz  
// NOTE - the ClassWizard will add and remove mapping macros here. &:)e   
// DO NOT EDIT what you see in these blocks of generated code! x+5y287#  
//}}AFX_MSG_MAP @;@Wt`(2a  
END_MESSAGE_MAP() N\ dr_   
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CHookApp::CHookApp() s *1%I$=@  
{ E|Z7art  
 // TODO: add construction code here, ._z[T@!9  
 // Place all significant initialization in InitInstance pvJPMx  
} \ g[A{  
6WnGP>tc.  
CHookApp theApp; 7 }sj&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6KI< J*Wz`  
{ )hai?v~g  
 BOOL bProcessed=FALSE; ;M Z@2CO  
 if(HC_ACTION==nCode) [M6/?4\  
 { xF3H\`{4x  
  if((lParam&0xc0000000)==0xc0000000){// Key up iP~dH/B|v  
   switch(wParam) 15FGlO<<  
   { 7'xds  
    case VK_MENU: ,W/D0  
     MaskBits&=~ALTBIT; S+YbsLf  
     break; ~cEr <mzR  
    case VK_CONTROL: >K;'dB/m;1  
     MaskBits&=~CTRLBIT; MhpR^VM'.  
     break; q<cpU'-#  
    case VK_SHIFT: )ozN{&B6  
     MaskBits&=~SHIFTBIT; 0Ti>PR5M  
     break; #i GRi!$h  
    default: //judge the key and send message )WFSUZ~  
     break; zdUi1 b  
   } W=~H_ L?/  
   for(int index=0;index<MAX_KEY;index++){ 8W_X&X?Q  
    if(hCallWnd[index]==NULL) |!{ BjOAD'  
     continue; bz? *#S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /aB9pD+%  
    { O}3M+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %7?v='s=  
     bProcessed=TRUE; OAQ'/{~7  
    } ,FPgbs  
   } +>5 "fs$Y  
  } \l leO|m  
  else if((lParam&0xc000ffff)==1){ //Key down TGz5t$]I  
   switch(wParam) ?iBHJ{  
   { 2v<[XNX  
    case VK_MENU: b#C"rTw  
     MaskBits|=ALTBIT; 4&/-xg87(  
     break; t%AW0#TZ  
    case VK_CONTROL: *7I=vro  
     MaskBits|=CTRLBIT; s"|N-A=cS  
     break; !Jj=H()}  
    case VK_SHIFT: YtrMJ"  
     MaskBits|=SHIFTBIT; oB$D&  
     break; G#! j`  
    default: //judge the key and send message '4A8\&lQO  
     break; cZ7b$MZ%9  
   } -j9R%+YW<  
   for(int index=0;index<MAX_KEY;index++) Q'^]lVY  
   { -~h2^Oez  
    if(hCallWnd[index]==NULL) .j4IW 3)  
     continue; #| 8!0]n'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Sk$ XC  
    { dR_hPBn/@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w`VmN}pR  
     bProcessed=TRUE; y o[!q|z  
    } |[TH ~ o  
   } sh?Dxodp9  
  } N3H!ptn37  
  if(!bProcessed){ x9HA^Rj4-  
   for(int index=0;index<MAX_KEY;index++){ &w3LMOT  
    if(hCallWnd[index]==NULL) 8X]j;Rb  
     continue; z@ A5t4+3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1W HR;!u  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ? F f w'O  
   } $/45*  
  } !{SU G+.2  
 } 0r=Lilu{q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); s/Wg^(&M  
} r/L3j0  
DRV vW6s  
BOOL InitHotkey() v4|kiy  
{ bah5 f  
 if(hHook!=NULL){ W.n@  
  nHookCount++; R< xxwjt  
  return TRUE; ^LT9t2  
 } +.HQ+`8z]  
 else m= fmf(  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); W9V%Xc`LQ  
  if(hHook!=NULL) AJ:@c7:eS  
   nHookCount++; $b$r,mc  
  return (hHook!=NULL); #D+Fq^="P  
} 6M$.gX G.  
BOOL UnInit() Qq]UEI `Go  
{ '7'cKp  
 if(nHookCount>1){ OG 5n9sx  
  nHookCount--; rf1nC$Sop  
  return TRUE; ;Xgy2'3  
 } g)&-S3\  
 BOOL unhooked = UnhookWindowsHookEx(hHook); uD:O[H-x  
 if(unhooked==TRUE){ INzQ0z-z  
  nHookCount=0; !1"~tA!+p=  
  hHook=NULL; `U`Z9q5-  
 } 9LJ/m\bi  
 return unhooked; nhXa&Nro  
} rmQGzQnun  
/yrR f;}<O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &[\rnJ?D  
{ ZVIBmx  
 BOOL bAdded=FALSE; iJrscy-  
 for(int index=0;index<MAX_KEY;index++){ OR"ni  
  if(hCallWnd[index]==0){ ",8h>eEWK  
   hCallWnd[index]=hWnd; ;{Z2i%  
   HotKey[index]=cKey; A7_*zR @  
   HotKeyMask[index]=cMask; PLo.q|%  
   bAdded=TRUE; "TjR]jnV(  
   KeyCount++; /'VCJjzZ  
   break; ~?b(2gn  
  } YBS]JCO  
 } x5`q)!<&  
 return bAdded; JG}U,{7(  
} xI:;%5{LN  
( v ~/glf  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z^GriL  
{ A7b7IM[  
 BOOL bRemoved=FALSE; )cs y^-qw  
 for(int index=0;index<MAX_KEY;index++){ 4VU5}"<  
  if(hCallWnd[index]==hWnd){ ~Nc] `95  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "hlIGJ?_=  
    hCallWnd[index]=NULL; oHi&Z$#!n  
    HotKey[index]=0; `(o1&  
    HotKeyMask[index]=0; dnIBAe  
    bRemoved=TRUE; X?7$JV-:  
    KeyCount--; U;V. +onv  
    break; [sKdIw_  
   } (vj2XiO^+  
  } zLh ~x  
 } rX{|]M":T  
 return bRemoved; /CA)R26G  
} @#Xzk?+  
Ha+FH8rZ  
void VerifyWindow() D *LZ_  
{ E!Fy2h>[Z  
 for(int i=0;i<MAX_KEY;i++){ A&t'uY6  
  if(hCallWnd!=NULL){ swLgdk{8n  
   if(!IsWindow(hCallWnd)){ :&or'Yi}  
    hCallWnd=NULL; :sPku<1is  
    HotKey=0; 8v]{ 5  
    HotKeyMask=0; TyBNRnkt  
    KeyCount--; 2Vu|uZd  
   } ]7u8m[@  
  } )uX:f8  
 } XIp9=jhSR  
} 1  yzxA(  
#JLDj(a?  
BOOL CHookApp::InitInstance() 9C4l@ jrF  
{ r 2   
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); lP9I\Ge&  
 hins=AfxGetInstanceHandle(); VhW;=y>}  
 InitHotkey(); /d{L]*v)]  
 return CWinApp::InitInstance(); Dh9-~}sW'  
} wyc,Ir  
~AE034_N  
int CHookApp::ExitInstance() EhD|\WLx!  
{ 2Qy!Aa  
 VerifyWindow(); yZ!Eu#81  
 UnInit(); )$]+R?v  
 return CWinApp::ExitInstance(); } 1XLe  
} 93!a  
X  ]a>  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file S|>Up%{n[  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) I Mv^ 9T:  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Qs?+vk?*h  
#if _MSC_VER > 1000 s?6 7@\  
#pragma once Q[b({Vj;tG  
#endif // _MSC_VER > 1000 h3)KT+7.  
x!$,Hcph,  
class CCaptureDlg : public CDialog D1j 7iv  
{ <m6Xh^Ko;  
 // Construction ~<Lf@yu-{  
 public: ?\O+#U%W  
  BOOL bTray; 9=kTTFs  
  BOOL bRegistered; bL&]3n9Rwu  
  BOOL RegisterHotkey(); )Xh_q3=  
  UCHAR cKey; FI/YJ@21  
  UCHAR cMask; zhCI+u4/qz  
  void DeleteIcon(); )-QNWN H  
  void AddIcon(); 18n84RkI9  
  UINT nCount; `Eu(r]:W  
  void SaveBmp(); Gz6GU.IyQy  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor {//F>5~[  
  // Dialog Data kK1qFe?]  
  //{{AFX_DATA(CCaptureDlg) {&<}*4D  
  enum { IDD = IDD_CAPTURE_DIALOG }; k0YsAa#6V  
  CComboBox m_Key; ~o%-\^oc  
  BOOL m_bControl; N{`l?t0I  
  BOOL m_bAlt; FSQ&J|O  
  BOOL m_bShift; 2s4=%l  
  CString m_Path; r2](~&i2  
  CString m_Number; a:| 4q  
  //}}AFX_DATA aEk*-v#{  
  // ClassWizard generated virtual function overrides 7 IHD?pnZ  
  //{{AFX_VIRTUAL(CCaptureDlg) NSgHO`gU8  
 public: ( Lu.^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); \G=E%aK  
 protected: dI 5sqM:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /-hF<oNQ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); hZ'oCRM  
  //}}AFX_VIRTUAL QlS5B.h,  
  // Implementation x ?V/3zW  
 protected: b "Mq7&cf  
  HICON m_hIcon; #VOjnc/rW  
  // Generated message map functions (wlsn6h  
  //{{AFX_MSG(CCaptureDlg) _eQ P0N  
  virtual BOOL OnInitDialog(); a?Y1G3U'  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); i]53A0l  
  afx_msg void OnPaint(); _$'Mx'IC=  
  afx_msg HCURSOR OnQueryDragIcon(); ^kl9U+  
  virtual void OnCancel(); x<Zhj3  
  afx_msg void OnAbout(); n>E*g|a  
  afx_msg void OnBrowse(); R_qo]WvR;  
  afx_msg void OnChange(); VA%"IAl  
 //}}AFX_MSG Fkz  
 DECLARE_MESSAGE_MAP() B@;)$1-UT  
}; YEQW:r_h.S  
#endif &CL|q+-  
ZM vTDH!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  q%k+x)  
#include "stdafx.h" )a^Yor)o"  
#include "Capture.h" uTU4Fn\$L  
#include "CaptureDlg.h" @*DIB+K  
#include <windowsx.h> p-pw*wH0  
#pragma comment(lib,"hook.lib") b66X])+4jE  
#ifdef _DEBUG pq[mM!;#v  
#define new DEBUG_NEW w}.'Tebu  
#undef THIS_FILE [Kj:~~`T   
static char THIS_FILE[] = __FILE__; 0v@/I<  
#endif AIm$in`P  
#define IDM_SHELL WM_USER+1 jOb[h=B"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SznE:+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +hg\DqO^M  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Y/S3)o  
class CAboutDlg : public CDialog 2*citB{  
{ X?6h>%) k  
 public: VU/W~gb4"A  
  CAboutDlg(); eCp|QSXE  
  // Dialog Data >$mSF Jz5S  
  //{{AFX_DATA(CAboutDlg) Q@2tT&eL  
  enum { IDD = IDD_ABOUTBOX }; _=L;`~=C9e  
  //}}AFX_DATA \u]CD}/  
  // ClassWizard generated virtual function overrides lkfFAwnc  
  //{{AFX_VIRTUAL(CAboutDlg) k,7+=.6  
 protected: 5ZA%,pH>Jq  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PEBFN  
  //}}AFX_VIRTUAL q~J oGTv  
  // Implementation z}1xy+  
 protected: |mk}@OEf  
  //{{AFX_MSG(CAboutDlg) LO]6Xd"  
  //}}AFX_MSG ]|N4 #4  
  DECLARE_MESSAGE_MAP()  j/9QV  
}; KupMndK  
5(|M["KK~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -WUYE  
{ ]VWfdG  
 //{{AFX_DATA_INIT(CAboutDlg) }Hz-h4Z  
 //}}AFX_DATA_INIT Q$)|/Y))  
} $a\Uv0:xRx  
Q H_W\W  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Tdwwtbe  
{ B~>cNj<  
 CDialog::DoDataExchange(pDX); =YGP%}_.p{  
 //{{AFX_DATA_MAP(CAboutDlg) + |qfgi  
 //}}AFX_DATA_MAP EyPJvs  
} Z va  
&^IcL!t[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) EB>B,#  
 //{{AFX_MSG_MAP(CAboutDlg) b%;59^4AjD  
 // No message handlers JYd7@Msfc  
 //}}AFX_MSG_MAP b;L>%;  
END_MESSAGE_MAP() }E5#X R  
ay(!H~q_U  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )E:,V~< 8  
: CDialog(CCaptureDlg::IDD, pParent) Iz )hz9k  
{ P/pjy  
 //{{AFX_DATA_INIT(CCaptureDlg) y5/6nvH_6  
  m_bControl = FALSE; qijcS2E6S  
  m_bAlt = FALSE; bW9"0=j[{  
  m_bShift = FALSE; lB!vF ~A&  
  m_Path = _T("c:\\"); 6B''9V:s  
  m_Number = _T("0 picture captured."); PDIclIMS'F  
  nCount=0; 5ttMua <G?  
  bRegistered=FALSE; KO|pJ3  
  bTray=FALSE; ahtYSz_FM  
 //}}AFX_DATA_INIT V-_/(xt*  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Hl3)R*&'J  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 3u*hT T  
} wm=RD98  
=x^l[>sz  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) xb>n&ym?  
{ NaA+/:  
 CDialog::DoDataExchange(pDX); i~)N QmH<  
 //{{AFX_DATA_MAP(CCaptureDlg) Px?Ao0)Z,  
  DDX_Control(pDX, IDC_KEY, m_Key); 'qV3O+@MF  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); HmExfW  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A/"}Y1#qX\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -~][0PVL9  
  DDX_Text(pDX, IDC_PATH, m_Path); NQC3!=pQ}Y  
  DDX_Text(pDX, IDC_NUMBER, m_Number); jJVT_8J  
 //}}AFX_DATA_MAP &$c5~9p\B  
} 7':f_]  
h}|6VJ@.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 1s`)yu^`v  
//{{AFX_MSG_MAP(CCaptureDlg) U,<]J*b(@4  
 ON_WM_SYSCOMMAND() C ]'g:93L  
 ON_WM_PAINT() "#pzZ)Zh  
 ON_WM_QUERYDRAGICON() >+ ]R4  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) e3eVvl5]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) mF'-Is  
 ON_BN_CLICKED(ID_CHANGE, OnChange) =3|pHc hJ4  
//}}AFX_MSG_MAP &Vt2be*  
END_MESSAGE_MAP() &xiOTkqB  
;cI#S%uvpn  
BOOL CCaptureDlg::OnInitDialog() i-,D_   
{ d=XpO*v,[  
 CDialog::OnInitDialog(); $_C+4[R?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); URK!W?3c  
 ASSERT(IDM_ABOUTBOX < 0xF000); rLJ[FqS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &$qF4B*  
 if (pSysMenu != NULL) \Mb(6~nC  
 { hCM8/Vvx6  
  CString strAboutMenu; CE#\Roi x)  
  strAboutMenu.LoadString(IDS_ABOUTBOX); cJ(BiL-uF  
  if (!strAboutMenu.IsEmpty()) M XZq  
  { u 1ZJHry  
   pSysMenu->AppendMenu(MF_SEPARATOR); mX&xn2}qZ"  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h2wN<dJCM  
  } JI"/N`-?;b  
 } r<*O  
 SetIcon(m_hIcon, TRUE); // Set big icon l"J*)P  
 SetIcon(m_hIcon, FALSE); // Set small icon 6F`qi:a+  
 m_Key.SetCurSel(0); wE$s'e  
 RegisterHotkey(); U:]MgZWn  
 CMenu* pMenu=GetSystemMenu(FALSE); AkrTfi4hC  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ZXsYn  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); QsF4Dl   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); dhHEE|vrz  
 return TRUE; // return TRUE unless you set the focus to a control s`hav  
} J&eAL3"GF  
N = LM?(H  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) V+lRi"m?|  
{ w[(n>  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _>Pk8~m  
 { iJdP>x  
  CAboutDlg dlgAbout; H9RGU~q4s[  
  dlgAbout.DoModal(); jfUJ37zNZr  
 } b5j*xZv  
 else  I>A^I  
 { ]gu1#  
  CDialog::OnSysCommand(nID, lParam); 6Rcu a<;2P  
 } ~TDzq -U)  
} 4`nqAX~'f  
?6i;)eIOI  
void CCaptureDlg::OnPaint() -~ 0] 7Cpl  
{ ?g2zmI!U  
 if (IsIconic()) {odA[H  
 { SIq1X'7  
  CPaintDC dc(this); // device context for painting (w+%=z"M  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); I:#Ok+   
  // Center icon in client rectangle x>%joKY[  
  int cxIcon = GetSystemMetrics(SM_CXICON); E0QPE5_  
  int cyIcon = GetSystemMetrics(SM_CYICON); @(-yrU  
  CRect rect; +?;j&p  
  GetClientRect(&rect); {h#6z>p"u2  
  int x = (rect.Width() - cxIcon + 1) / 2; M% @  
  int y = (rect.Height() - cyIcon + 1) / 2; k oM]S+1  
  // Draw the icon ! k,<|8(0  
  dc.DrawIcon(x, y, m_hIcon); Z_FNIM0f  
 }  c/ _yMN  
 else -vV'Lw(  
 { 3DW3LYo{  
  CDialog::OnPaint(); BCx!0v?9  
 } `<^*jB@P  
} CtM'L   
w NH9WG  
HCURSOR CCaptureDlg::OnQueryDragIcon() gN?0m4[$i  
{ lEHwZ<je  
 return (HCURSOR) m_hIcon; c3] C:t+  
} XLm@etf  
I}+;ME|<2  
void CCaptureDlg::OnCancel() $jG4pPG  
{ 0Uw ^FcW  
 if(bTray) WSLy}@`Vx  
  DeleteIcon(); :uo[&&c  
  CDialog::OnCancel(); EKuSnlTXba  
} IIxJqGN:  
e_/x&a(i8  
void CCaptureDlg::OnAbout() s~J=<)T*6  
{ -es"0wS<u  
 CAboutDlg dlg; WfG(JJ  
 dlg.DoModal(); mc ZGg;3  
} xc;DdK=1X  
>,"sHm}l%  
void CCaptureDlg::OnBrowse() ,=|4:F9  
{ ` W4dx&  
 CString str; rjUBLY1(  
 BROWSEINFO bi; V^n0GJNo  
 char name[MAX_PATH]; JrDHRIkgm  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); B3mS]  
 bi.hwndOwner=GetSafeHwnd(); \D?:J3H*]  
 bi.pszDisplayName=name; ~*}$>@f{[X  
 bi.lpszTitle="Select folder"; WPo:^BD   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =&7@<vBpy  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); =g~W%})  
 if(idl==NULL) +tt9R_S  
  return; zA s&%OjG  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); A59gIp*>  
 str.ReleaseBuffer(); 9tK>gwb  
 m_Path=str; Qz+sT6js-  
 if(str.GetAt(str.GetLength()-1)!='\\') jl}$HEI5m}  
  m_Path+="\\"; d(7NO;S8  
 UpdateData(FALSE); /v#)f-N%zs  
} #cU^U#;=r  
AW~"yI<  
void CCaptureDlg::SaveBmp() Au.:OeJm  
{ I@\+l6&#;  
 CDC dc; 5G(E&>~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); t> . Fl-  
 CBitmap bm; z/7$NxJH  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3;_ n{&  
 int Height=GetSystemMetrics(SM_CYSCREEN); -(#-I $z  
 bm.CreateCompatibleBitmap(&dc,Width,Height); mS%4gx~~_n  
 CDC tdc; lb~E0U`\E`  
 tdc.CreateCompatibleDC(&dc); iW;i!,  
 CBitmap*pOld=tdc.SelectObject(&bm); 3c#s|qW  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); XErUS80  
 tdc.SelectObject(pOld); ?Elg?)os  
 BITMAP btm; V8PLFt;  
 bm.GetBitmap(&btm); #@qN8J}R  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; !tNd\ }@  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); T3N"CUk  
 BITMAPINFOHEADER bih; zO~9zlik  
 bih.biBitCount=btm.bmBitsPixel; >7b)y  
 bih.biClrImportant=0; s0C:m  
 bih.biClrUsed=0; kl}Xmw{tJ  
 bih.biCompression=0; _xrwu;o0}  
 bih.biHeight=btm.bmHeight; ,9of(T(~  
 bih.biPlanes=1; :243H  
 bih.biSize=sizeof(BITMAPINFOHEADER); ~R]35Cp-#  
 bih.biSizeImage=size; "A3dvr  
 bih.biWidth=btm.bmWidth; )TJS4?  
 bih.biXPelsPerMeter=0; .DguR2KT  
 bih.biYPelsPerMeter=0; 27D!'S  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \9:wfLF8!  
 static int filecount=0; TDNf)Mm  
 CString name; '6-$Xq0^E  
 name.Format("pict%04d.bmp",filecount++); o 3N]`xD'  
 name=m_Path+name; \we\0@v  
 BITMAPFILEHEADER bfh; ?&X6:KJQ  
 bfh.bfReserved1=bfh.bfReserved2=0; 0CAa^Q^w  
 bfh.bfType=((WORD)('M'<< 8)|'B'); qpp/8M  
 bfh.bfSize=54+size; x,8<tSW)Z  
 bfh.bfOffBits=54; #=,imsW)  
 CFile bf; SO{p;g  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ nFM@@oA  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Ne6}oQy(S`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 60}! LmL  
  bf.WriteHuge(lpData,size); 9$1)k;ChP/  
  bf.Close(); 9em*r9-  
  nCount++; {1-V]h.<J  
 } iwF9[wAft  
 GlobalFreePtr(lpData); iL]'y\?lv  
 if(nCount==1) 6'C2SihYp  
  m_Number.Format("%d picture captured.",nCount); Y[ zZw~yx  
 else r&3pM2Da}  
  m_Number.Format("%d pictures captured.",nCount); r"{<%e  
  UpdateData(FALSE); pyZ9OA!PD  
} ~DF:lqwWP  
TNwK da+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p(JlvJjo  
{ c EnkU]  
 if(pMsg -> message == WM_KEYDOWN) ?GT@puJS-  
 { @T-p2#&  
  if(pMsg -> wParam == VK_ESCAPE) `>lzlEhKV  
   return TRUE; ,0N94pKy  
  if(pMsg -> wParam == VK_RETURN) +T{'V^  
   return TRUE; #{J,kcxS  
 } 5|8^9Oe5  
 return CDialog::PreTranslateMessage(pMsg); sLL7]m}  
} /JJw 6[ N  
n,'OiVl[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) h9s >LY  
{ FMw&(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ '0RwO[A#1  
  SaveBmp(); G"SBYU  
  return FALSE; {zLhiUH a0  
} 3ec`Wa  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ iw9Q18:I}  
 CMenu pop; 5F"|E-;  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); B4Y(?JTx  
 CMenu*pMenu=pop.GetSubMenu(0); #*%q'gyHT  
 pMenu->SetDefaultItem(ID_EXITICON); ,e722wz  
 CPoint pt; NH A5e<  
 GetCursorPos(&pt); b1#dz]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); e [h8}F  
 if(id==ID_EXITICON) UUe#{6Jx_  
  DeleteIcon(); eU@Cr7@,|  
 else if(id==ID_EXIT) iq$$+y,  
  OnCancel(); ,m3e?j@;r  
 return FALSE; PmpNAVE'  
} z+{,WHjo  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); / |r'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) .="bzgC3A  
 AddIcon(); 9!',b>C6  
 return res; !YL. .fb  
} XOP"Px@  
/ ~ %KVe  
void CCaptureDlg::AddIcon() .Pndx%X9s  
{ Jju#iwb  
 NOTIFYICONDATA data; r=uN9ro  
 data.cbSize=sizeof(NOTIFYICONDATA); o{qr!*_3  
 CString tip; [Nm4sI11  
 tip.LoadString(IDS_ICONTIP); g|X;ahTT  
 data.hIcon=GetIcon(0); friWW ^  
 data.hWnd=GetSafeHwnd(); 1c4/}3*  
 strcpy(data.szTip,tip); DOS0;^f  
 data.uCallbackMessage=IDM_SHELL; 0|4%4 Mt  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; hwYQGtjF  
 data.uID=98; LpbsYl  
 Shell_NotifyIcon(NIM_ADD,&data); v X~RP *  
 ShowWindow(SW_HIDE); $ ,Ck70_  
 bTray=TRUE; 4R^mI  
} :ue:QSt(u  
*|.0Myjo  
void CCaptureDlg::DeleteIcon() `4?~nbz  
{ HSUI${<  
 NOTIFYICONDATA data; 0oZsb\  
 data.cbSize=sizeof(NOTIFYICONDATA); g#]" hn  
 data.hWnd=GetSafeHwnd(); 3f.b\4 U  
 data.uID=98; t_z>Cl^u  
 Shell_NotifyIcon(NIM_DELETE,&data); %M F;`;1  
 ShowWindow(SW_SHOW); K7knK  
 SetForegroundWindow();  fE f_F r  
 ShowWindow(SW_SHOWNORMAL); $``1PJoi  
 bTray=FALSE; !LMN[3M_  
} Dr&('RZ4  
1@48BN8cm'  
void CCaptureDlg::OnChange() \*hrW(   
{ PX: '/{V  
 RegisterHotkey(); Ks^6.)  
} Y_&g="`Q  
!l?.5Pm])  
BOOL CCaptureDlg::RegisterHotkey() $4kH3+WJ  
{ 8I20*#  
 UpdateData(); GG064zPq7  
 UCHAR mask=0; wcSyw2D  
 UCHAR key=0; }0#U;_;D  
 if(m_bControl) r`y ezbG  
  mask|=4; u-D dq~;|  
 if(m_bAlt) hd\gH^wk  
  mask|=2; *K!|@h{60  
 if(m_bShift) /n~\\9#3  
  mask|=1; -C-?`R  
  key=Key_Table[m_Key.GetCurSel()]; n9w9JXp;!  
 if(bRegistered){ `+'rib5  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); x9/H/'  
  bRegistered=FALSE; iXu]e;6  
 } RpWTpT1  
 cMask=mask; '|]e<Mt-  
 cKey=key; Q)m4_+,d  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Ars687WB  
 return bRegistered; s4Sd>D 7  
} KH)D 08  
oVA?J%EK  
  四、小结 N7'OPTKt&  
Ds #/  
  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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