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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: zW)Wt.svP  
  @Q;s[Kg{!  
  一、实现方法 sN#ju5  
$>+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: ":GC}VIS  
C\dk} A  
#pragma data_seg("shareddata") M0 KU}h  
HHOOK hHook =NULL; //钩子句柄 _qo\E=E  
UINT nHookCount =0; //挂接的程序数目 i1bmUKZ8'L  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #ZP;] W  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 |WOc0M[U  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Oi-%6&}J  
static int KeyCount =0; f=S2O_Ee  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Imq-5To#  
#pragma data_seg() T{yJL<  
VC% .u.< F  
  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。 ~_g{P3  
@S>;t)\J  
  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: Ap4.c8f?Q-  
$~%h4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 4x#tUzb;  
cKey,UCHAR cMask) lXzm)  
{ !aL=R)G&e  
 BOOL bAdded=FALSE; ~CdW: t  
 for(int index=0;index<MAX_KEY;index++){ d9%P[(yM^  
  if(hCallWnd[index]==0){ j9vK~_?;  
   hCallWnd[index]=hWnd; [8 H:5 Ho  
   HotKey[index]=cKey; ZNL+w4  
   HotKeyMask[index]=cMask; g=,}j]tl  
   bAdded=TRUE; qOnGP{   
   KeyCount++; m^,VEV>  
   break; TZ!@IBu  
  } S_ ;r!.  
 } 8lA,3'z  
 return bAdded; W,_2JqQp  
} <td]k%*+  
//删除热键 :fq4oHA#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ps[#z@5{x  
{ %&q}5Y4!  
 BOOL bRemoved=FALSE;  nb6Y/`G  
 for(int index=0;index<MAX_KEY;index++){ KeXt"U  
  if(hCallWnd[index]==hWnd){ j['B9vG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z_ Y'#5o#  
    hCallWnd[index]=NULL; l\uNh~\  
    HotKey[index]=0; *JQ*$$5  
    HotKeyMask[index]=0; 1X9s\JKQ  
    bRemoved=TRUE; g#cet{>  
    KeyCount--; evNe6J3  
    break; 5K)_w:U X  
   } /H3w7QU  
  } mZjpPlJ  
 } xtLP 4VL  
 return bRemoved; 5Z6MQ`(k  
} P|]r*1^5  
j-DWz>x  
t V>qV\>  
  DLL中的钩子函数如下: ;oDr8a<A  
%qTIT?6'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6<R[hIWpZ}  
{ .aVtd [  
 BOOL bProcessed=FALSE; 3d olrW  
 if(HC_ACTION==nCode) Re %dNxJ=  
 { Jyr V2Tk^  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .`V$j.a  
   switch(wParam) \xv(&94U  
   {  Dg{d^>T!_x  
    case VK_MENU: a/1;|1a.  
     MaskBits&=~ALTBIT; 5Dz$_2oM3  
     break; 9cU9'r# h  
    case VK_CONTROL: x{tlC}t  
     MaskBits&=~CTRLBIT; dM P'Vnfj  
     break; GG +T-  
    case VK_SHIFT: CH;U_b  
     MaskBits&=~SHIFTBIT; ^w2 HF  
     break; n;Q8Gg2U  
    default: //judge the key and send message cCNRv$IO\  
     break; ;gD\JA  
   } SW'eTG  
   for(int index=0;index<MAX_KEY;index++){ Au}l^&,zN  
    if(hCallWnd[index]==NULL) 4v3gpLH  
     continue; ;ko6igx)+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )5gj0#|CG@  
    { 7')W+`o8eL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,]W|"NUI  
     bProcessed=TRUE; G -+!h4p  
    } 0y?;o*&U\  
   } pRL:,q\  
  } ( }Bb=~  
  else if((lParam&0xc000ffff)==1){ //有键按下 GQ>0E  
   switch(wParam) ~1[n@{*:(  
   { w>=N~0@t  
    case VK_MENU: c;fLM`{*  
     MaskBits|=ALTBIT; 7v)p\#-  
     break; kc't  
    case VK_CONTROL:  X0$q !  
     MaskBits|=CTRLBIT; v+W'0ymbnV  
     break; N'R^gL  
    case VK_SHIFT: OE9,D:t v  
     MaskBits|=SHIFTBIT; TjYHoL5  
     break; s&-MJ05y  
    default: //judge the key and send message #Lp}j?Y  
     break; Q}KOb4D  
   } {\P%J:s#9  
   for(int index=0;index<MAX_KEY;index++){ EwA*  
    if(hCallWnd[index]==NULL) %Uz\P|6PO  
     continue; vc&+qI+I3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =CZRX' +yN  
    { 'xGhMgR;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *Q/^ib9=  
     bProcessed=TRUE; bvB', yBZ  
    } dnU-v7k,{  
   } J:Qx5;b;  
  } / Xb4'Qj  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Y%;X7VxU*  
   for(int index=0;index<MAX_KEY;index++){ MJ1qU}+]  
    if(hCallWnd[index]==NULL) tZz%x?3G  
     continue; ]rH[+t-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?X@[ibH6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 'ET];iZ2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 o,dp{+({  
   } 9&AO  
  } Ohp@ZJ!a?  
 } _lwKa, }  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); a*U[;(  
} jTIG#J)  
~$5XiY8A  
  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: K4<"XF1A:  
$DIy?kZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aSX4~UYB=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i#t-p\Tcz  
-ZZJk-::  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ?{J1Uw<  
3zD#V3 =  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) GyN|beou  
{ c]aU}[s1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) t~/:St  
 { ":M]3.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 wTU$jd1;+  
  SaveBmp(); 4=Ru{ewRV  
  return FALSE; `hkvxt  
 } $jE<n/8  
 …… //其它处理及默认处理 v#%rjml[  
} otR7E+*3  
|<,qnf | -  
ZZI} Ot{  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 zdrP56rzZ  
M?" 4 {  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 VPYLDg.'  
*m+FMyr  
  二、编程步骤 9U6$-]J  
bHnKtaK4c  
  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"; <m`CLVx8m  
Jj>Rzj!m  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~^Cx->l  
r*vh3.Agl  
  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; PKrG6% W+  
9u{[e"  
  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; &'W7-Z\j-  
BN CM{}e  
  5、 添加代码,编译运行程序。 '`k7l7I[@  
|ffHOef  
三、程序代码 K?' m#}]  
)2?]c  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL zMbFh_dcq  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 18rV Acj  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Y:TfD{Xgc  
#if _MSC_VER > 1000 QjY}$  
#pragma once 7CH&n4v  
#endif // _MSC_VER > 1000 KJec/qca  
#ifndef __AFXWIN_H__ cLf90|YFp  
#error include 'stdafx.h' before including this file for PCH L{%L*z9J  
#endif ,5;M(ft#  
#include "resource.h" // main symbols `J,>#Y6(J  
class CHookApp : public CWinApp >:6iFPP  
{ M> WWP3  
 public: ) Y)_T&O  
  CHookApp(); q=5aHH% |  
  // Overrides +\Jo^\  
  // ClassWizard generated virtual function overrides it\$Pih]  
  //{{AFX_VIRTUAL(CHookApp) `D[O\ VE  
 public: IdAh)#) 7  
  virtual BOOL InitInstance(); yO%^[c?  
  virtual int ExitInstance(); ?m]vk|>  
  //}}AFX_VIRTUAL Dnw^H.  
  //{{AFX_MSG(CHookApp) {. 9BG&  
  // NOTE - the ClassWizard will add and remove member functions here. auK9wQ%\  
  // DO NOT EDIT what you see in these blocks of generated code ! \{ EVRRXn  
  //}}AFX_MSG gPk,nB  
  DECLARE_MESSAGE_MAP() :k1?I'q%  
}; -#f.}H'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); TF :'6#p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hb3:,c(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g@>llve{  
BOOL InitHotkey(); '=E;^'Rl  
BOOL UnInit(); u.X]K:Yow  
#endif [E a{);  
V0,JTWc  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. TS6xF?  
#include "stdafx.h" ,M3hE/rb/  
#include "hook.h" O00;0wu  
#include <windowsx.h> qo3+=*"V  
#ifdef _DEBUG -fA=&$V  
#define new DEBUG_NEW ({t^/b*8  
#undef THIS_FILE +=E\sEe  
static char THIS_FILE[] = __FILE__; \KhcNr?ja=  
#endif (_e[CqFu  
#define MAX_KEY 100 vlkw Wm  
#define CTRLBIT 0x04 $8eiifj  
#define ALTBIT 0x02 =|E "  
#define SHIFTBIT 0x01 &wK:R,~x6  
#pragma data_seg("shareddata") {UP[iw$~  
HHOOK hHook =NULL; r 1r@TG\  
UINT nHookCount =0; h^=;\ng1l  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey hE(R[hc  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT g}<jn'@{  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey pmB {b  
static int KeyCount =0; 0 (-4"u>?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift CHKhJ v3+4  
#pragma data_seg() 8C*@d_=q  
HINSTANCE hins; WBWW7HK  
void VerifyWindow(); ]?=87w  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ,1mL=|na  
//{{AFX_MSG_MAP(CHookApp) -z`%x@F<&L  
// NOTE - the ClassWizard will add and remove mapping macros here. qF~9:`  
// DO NOT EDIT what you see in these blocks of generated code! Mn ,hmIz  
//}}AFX_MSG_MAP >1!u]R<3  
END_MESSAGE_MAP() G%bv<_R  
J "I,]  
CHookApp::CHookApp() 8S8qj"s  
{ #b;?:.m\=  
 // TODO: add construction code here, zz U,0 L  
 // Place all significant initialization in InitInstance gP QOv  
} $}W T"K  
T)I)r239h  
CHookApp theApp; %evb.h)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) uluAqDz`  
{ pCIS8 2L  
 BOOL bProcessed=FALSE; @)h>vg  
 if(HC_ACTION==nCode) Yg.[R] UC  
 { HZ'rM5Kq  
  if((lParam&0xc0000000)==0xc0000000){// Key up F@Sk=l(  
   switch(wParam) z<55[~3  
   { F&wAre<  
    case VK_MENU: 9k;,WU(K<  
     MaskBits&=~ALTBIT; aU(.LC  
     break; oC|oh  
    case VK_CONTROL: s*Qyd{"z  
     MaskBits&=~CTRLBIT; %.=}v7&<z  
     break; !lfE7|\p  
    case VK_SHIFT: Vpg>K #w  
     MaskBits&=~SHIFTBIT; t~ {O)tt  
     break; (5!'42  
    default: //judge the key and send message 2JK '!Ry)  
     break; s_y8+BJaV  
   } vcu@_N1Dc  
   for(int index=0;index<MAX_KEY;index++){ +w]#26`d  
    if(hCallWnd[index]==NULL) Cik1~5iF  
     continue; As46:<!2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >rQj1D)@  
    { -O$vJ,*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H};1>G4  
     bProcessed=TRUE; f9K7^qwkiz  
    } tNFw1&  
   } 8B*(P>  
  } _$AM=?P &  
  else if((lParam&0xc000ffff)==1){ //Key down o~XK*f=(  
   switch(wParam) A*DN/lG  
   { D-{*3?x  
    case VK_MENU: gPCf+>X{  
     MaskBits|=ALTBIT; aC}\`.Kb  
     break; j r) M],  
    case VK_CONTROL: ,1~zYL?  
     MaskBits|=CTRLBIT; ^(:~8 h  
     break; E:8*o7  
    case VK_SHIFT: BmV `<Q,  
     MaskBits|=SHIFTBIT; 8  *f 9  
     break; 5.VPK 338A  
    default: //judge the key and send message eaf-_#qb  
     break; ]#G s6CsT|  
   } } TUr96  
   for(int index=0;index<MAX_KEY;index++) oVK:A;3T|  
   { a,oTU\m C  
    if(hCallWnd[index]==NULL) PoaCnoNS  
     continue; kZG=C6a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KE,.Evyu=  
    { /o4e n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7~P2q/2E>  
     bProcessed=TRUE; (NFrZ0  
    } Chnt)N`/B4  
   } ~NIhS!  
  } CqEbQ>?  
  if(!bProcessed){ dGk"`/@  
   for(int index=0;index<MAX_KEY;index++){ }T$BU>z33N  
    if(hCallWnd[index]==NULL) K/*R}X  
     continue; >niv >+!N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) X:s~w#>R  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); LujLC&S  
   } i FZGfar?  
  } gf>H-718F  
 } 0+iRgnd9?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #,z-Pj?O!  
} &V*MNi,4Z  
mQ`atFz:Z  
BOOL InitHotkey() wY ItG"+6  
{ v K{2  
 if(hHook!=NULL){ t,De/L  
  nHookCount++; vNjc  
  return TRUE; [z!m  
 } r2#G|/=@  
 else lUjZ=3"'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); L~PiDQr?r  
  if(hHook!=NULL) {g nl6+j  
   nHookCount++; QP\:wi  
  return (hHook!=NULL); #$W5)6ch  
} 1"CWEL`i  
BOOL UnInit() ?rOj?J9  
{ `WH$rx!  
 if(nHookCount>1){ n`Z}tQ%)o  
  nHookCount--; i ed 1+H  
  return TRUE; >g !Z|ju  
 } b/[X8w'VP  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 'sZGLgT;m  
 if(unhooked==TRUE){ -KC@M  
  nHookCount=0; @}6<,;|DQ  
  hHook=NULL; H,TApF89A  
 } M <JX  
 return unhooked; J\+fkN<.  
} h^rG5Q  
@cIYS%iZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <|k :%  
{ .b_ppieNY  
 BOOL bAdded=FALSE; y2+f)Xp_.C  
 for(int index=0;index<MAX_KEY;index++){ OD7A(28  
  if(hCallWnd[index]==0){ 0B8Wf/j?M  
   hCallWnd[index]=hWnd; BTwc(oL  
   HotKey[index]=cKey; ngZq]8 =o  
   HotKeyMask[index]=cMask; KgM|:'  
   bAdded=TRUE; .t[u_tBL  
   KeyCount++; )T9Cv8  
   break; ~/A2 :}Cp=  
  } NpGi3>5  
 } 8B-PsS|'  
 return bAdded; EE]xZz>o  
} 1/mBp+D  
>[wxZ5))  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EoutB Vm  
{ I*%3E.Z@g  
 BOOL bRemoved=FALSE; 7ucm1   
 for(int index=0;index<MAX_KEY;index++){ Mhn1-ma:  
  if(hCallWnd[index]==hWnd){ @$kO7k0{g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \2+ngq)  
    hCallWnd[index]=NULL; Q^va +O  
    HotKey[index]=0; !+$QN4{9  
    HotKeyMask[index]=0; ;5;>f)diS  
    bRemoved=TRUE; 1.@{5f3T  
    KeyCount--; `Eg X#  
    break; H2|'JA#v  
   } x7 e0&  
  } F^{31iU~CX  
 } zf)*W#+  
 return bRemoved; 4r_*: $g  
} '2Zs15)V  
nW]CA~  
void VerifyWindow() 8Ys)qx>7'  
{ }.D18bE(  
 for(int i=0;i<MAX_KEY;i++){ +fY@q ,`  
  if(hCallWnd!=NULL){ Kh4rl)L*+%  
   if(!IsWindow(hCallWnd)){ #@-dT,t  
    hCallWnd=NULL; $W}:,]hoj  
    HotKey=0; JcYY*p  
    HotKeyMask=0; #QsJr_=  
    KeyCount--; Hc8^w6S1@  
   } 82 |^o  
  } *VXx\&  
 } Pi1LOCq  
} G)YmaHeI;[  
- s'W^(  
BOOL CHookApp::InitInstance() Q'jGNWep  
{ f9UDH8X  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Efe(tH2q  
 hins=AfxGetInstanceHandle(); +cXi|Zf  
 InitHotkey(); 8h)7K/!\  
 return CWinApp::InitInstance(); Ln6emXqw  
} " ]k}V2l  
';\norx;  
int CHookApp::ExitInstance() shdzkET8N  
{ WYRC_U7  
 VerifyWindow(); eK(k;$4\^Y  
 UnInit(); {~]5QKg.  
 return CWinApp::ExitInstance(); l #C<bDw  
} 1F>8#+B/W  
jQ7;-9/~N  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file e~*tQ4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n&&C(#mBC  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =?4[:#Rh  
#if _MSC_VER > 1000 ]O:u9If  
#pragma once }s?w-u+(c6  
#endif // _MSC_VER > 1000 ?/T=G k  
a{e 2*V  
class CCaptureDlg : public CDialog fz VN;h  
{ Muq~p~m}  
 // Construction WU=EJY}#n  
 public: 2A|mXWG}~  
  BOOL bTray; x(Uv>k~i}  
  BOOL bRegistered; #k/T\PQ0s  
  BOOL RegisterHotkey(); }LS.bQKqi,  
  UCHAR cKey; ?`Mk$Y%my  
  UCHAR cMask; |Wck-+}U  
  void DeleteIcon(); ,_V/W'  
  void AddIcon(); z@ZI$.w  
  UINT nCount; J"h2"$v,  
  void SaveBmp(); 7g Ou|t  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 1Hhr6T^)  
  // Dialog Data 6yUThv.G#  
  //{{AFX_DATA(CCaptureDlg) %j@/Tx/  
  enum { IDD = IDD_CAPTURE_DIALOG }; tUJe-3,  
  CComboBox m_Key; e]>=;Zn  
  BOOL m_bControl; Ui"$A/  
  BOOL m_bAlt; _I EbRVpb  
  BOOL m_bShift; ~x4]p|)</  
  CString m_Path; 6b2h\+AP  
  CString m_Number; !S7?:MJ?p\  
  //}}AFX_DATA Z$c&Y>@)  
  // ClassWizard generated virtual function overrides x]hG2on!  
  //{{AFX_VIRTUAL(CCaptureDlg) Q~ Nq5[  
 public: +B8oW3v# )  
  virtual BOOL PreTranslateMessage(MSG* pMsg); bUy!hS;s  
 protected: r9 1i :  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support sqF.,A,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); CD#U`jf  
  //}}AFX_VIRTUAL F@ pf._c  
  // Implementation K&{ _s  
 protected: Lwm /[  
  HICON m_hIcon; !]7b31$M_  
  // Generated message map functions t{s>B]i^_w  
  //{{AFX_MSG(CCaptureDlg) ] !1HN3  
  virtual BOOL OnInitDialog(); OU/3U(%n]e  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7)O+s/.P)  
  afx_msg void OnPaint(); p]~PyzG!  
  afx_msg HCURSOR OnQueryDragIcon(); Hsov0  
  virtual void OnCancel(); (6H 7?nv  
  afx_msg void OnAbout(); =],c$)  
  afx_msg void OnBrowse(); Z s| *+[  
  afx_msg void OnChange(); (I;81h`1G  
 //}}AFX_MSG QCDica `+*  
 DECLARE_MESSAGE_MAP() * #z@b  
}; < fe.  
#endif T^+K`U  
txMC^-J2l  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file E.N>,N  
#include "stdafx.h" s)3CosU  
#include "Capture.h" o ,_F;ZhE  
#include "CaptureDlg.h" WFFd3TN%<  
#include <windowsx.h> pcOKC0b.  
#pragma comment(lib,"hook.lib") pE+:tMH;  
#ifdef _DEBUG H,EZ% Gl  
#define new DEBUG_NEW afaQb  
#undef THIS_FILE UWqX}T[^  
static char THIS_FILE[] = __FILE__; zmuR n4Nv  
#endif MYxuQ|w  
#define IDM_SHELL WM_USER+1 DuAix)#FN9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pnuwj U-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d'Dd66  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; f2KH&j>~r  
class CAboutDlg : public CDialog l.;^w  
{ pFu!$.Fr  
 public: JAMV@  
  CAboutDlg(); wr:-n  
  // Dialog Data r-WX("Vvh  
  //{{AFX_DATA(CAboutDlg) 8In~qf  
  enum { IDD = IDD_ABOUTBOX }; I3Z\]BI  
  //}}AFX_DATA @3b@]l5  
  // ClassWizard generated virtual function overrides ox.kL  
  //{{AFX_VIRTUAL(CAboutDlg) MR@Qn[RdM  
 protected: 0[uOKFgE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9&kPcFX B  
  //}}AFX_VIRTUAL ^*y 1Fn0  
  // Implementation 4 8; b  
 protected: c\szy&W  
  //{{AFX_MSG(CAboutDlg) RMs8aZCa  
  //}}AFX_MSG KdTWi;mV2-  
  DECLARE_MESSAGE_MAP() l]R7A_|  
}; !xg10N}I  
wLfH/J  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *[jq&  
{ nD 4C $  
 //{{AFX_DATA_INIT(CAboutDlg) |XQ\c.A  
 //}}AFX_DATA_INIT By*YBZ  
} e!w{ap8u  
tk 5 p@l  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .k up[d(  
{ Y)GU{  
 CDialog::DoDataExchange(pDX); . Wd0}?}  
 //{{AFX_DATA_MAP(CAboutDlg) ?c_:S]^  
 //}}AFX_DATA_MAP oj?y_0}:^  
} "9vL+Hh  
UH(w, R`  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v y-(:aH7U  
 //{{AFX_MSG_MAP(CAboutDlg) K1;b4Sl?A  
 // No message handlers hv|-`}#0  
 //}}AFX_MSG_MAP ycIcM~<4  
END_MESSAGE_MAP() Hy'EbQ  
r M}o)  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |w>b0aY  
: CDialog(CCaptureDlg::IDD, pParent) o~xGE6A*"  
{ ~Kt+j  
 //{{AFX_DATA_INIT(CCaptureDlg) 66MUrNW  
  m_bControl = FALSE; PCH$)F4^  
  m_bAlt = FALSE;  Cz&t*i/  
  m_bShift = FALSE; * +6Z^ 7  
  m_Path = _T("c:\\"); x>J(3I5_b  
  m_Number = _T("0 picture captured."); Cnu])R  
  nCount=0;  ,HNk<W  
  bRegistered=FALSE; "r@G V5ED  
  bTray=FALSE; B1Z;  
 //}}AFX_DATA_INIT Qo(<>d  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 pgv, Su  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9A`^ (  
} tC=K;zsXpz  
G ,`]2'(@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) &g8Xjx&zj  
{ 02:`Joy2D  
 CDialog::DoDataExchange(pDX); |@'K]$vZ*  
 //{{AFX_DATA_MAP(CCaptureDlg) Smh=Q4,W  
  DDX_Control(pDX, IDC_KEY, m_Key); $p }q,f.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); E;k$ICOXA  
  DDX_Check(pDX, IDC_ALT, m_bAlt); }1a(*s,s-^  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); XZTH[#MqeI  
  DDX_Text(pDX, IDC_PATH, m_Path); KfC{/J\   
  DDX_Text(pDX, IDC_NUMBER, m_Number); mZnsr@KF  
 //}}AFX_DATA_MAP >V%.=})K  
} NXS$w{^  
B" ]a8}u  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) P+e{,~o  
//{{AFX_MSG_MAP(CCaptureDlg) p7.~k1h  
 ON_WM_SYSCOMMAND() pQ ul0]  
 ON_WM_PAINT() zf\$T,t)  
 ON_WM_QUERYDRAGICON() k$Ug;`v#  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Io /;+R .  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) q03nu3uDI  
 ON_BN_CLICKED(ID_CHANGE, OnChange) @c>MROlrlF  
//}}AFX_MSG_MAP 3n_t^=  
END_MESSAGE_MAP() ,RAP_I!_x  
a]8W32  
BOOL CCaptureDlg::OnInitDialog() w`/~y   
{ szOa yAS  
 CDialog::OnInitDialog(); g`6I,6G  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .F\[AD 5  
 ASSERT(IDM_ABOUTBOX < 0xF000); I q{/-,v  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Nk$|nn9#'  
 if (pSysMenu != NULL) IFtaoK  
 { ?. L]QU  
  CString strAboutMenu; TyR@3H  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &TN.6Hm3  
  if (!strAboutMenu.IsEmpty()) $/E{3aT@F2  
  { s`]SK^j0  
   pSysMenu->AppendMenu(MF_SEPARATOR); G2=d q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 4~d:@Gmk&  
  } `0u)/s$  
 } 530Kk<%^}8  
 SetIcon(m_hIcon, TRUE); // Set big icon ' 1dhdm8  
 SetIcon(m_hIcon, FALSE); // Set small icon c11;(  
 m_Key.SetCurSel(0); raMtTL+  
 RegisterHotkey(); 4Le{|B  
 CMenu* pMenu=GetSystemMenu(FALSE); qzu(4*Gk6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); |k: FNu]C  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Jg.^h1>x  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [XP\WG>s  
 return TRUE; // return TRUE unless you set the focus to a control R@IwmJxX  
} c48I-{?  
D3+<16[,  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +}f}!h;  
{ h;OHpvk  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) T!1XL7  
 { 1CUI6@Cz)  
  CAboutDlg dlgAbout; @G|z _  
  dlgAbout.DoModal(); 8K\S]SZ  
 } N=@8~{V.  
 else }C JK9*Z  
 { pA\"Xe&  
  CDialog::OnSysCommand(nID, lParam); @~i : 8  
 } 8b25D|8l  
} v#5hK<9  
hu~XFRw15  
void CCaptureDlg::OnPaint() Q 9<i2H  
{ :v E\r#hJ"  
 if (IsIconic()) "(p&Oz  
 { fz+dOIU3\L  
  CPaintDC dc(this); // device context for painting )qDV3   
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6ziBGU#.-  
  // Center icon in client rectangle 7v`~;}5  
  int cxIcon = GetSystemMetrics(SM_CXICON); - G=doP0  
  int cyIcon = GetSystemMetrics(SM_CYICON); H 9?txNea  
  CRect rect; Jg6@)<n  
  GetClientRect(&rect); ;"NW= P&  
  int x = (rect.Width() - cxIcon + 1) / 2; * YLp C^&  
  int y = (rect.Height() - cyIcon + 1) / 2; d(,M  
  // Draw the icon Z3dI B`@  
  dc.DrawIcon(x, y, m_hIcon); H_u%e*W  
 } YizwKcuZ  
 else S e!B,'C%  
 { 0.^67'  
  CDialog::OnPaint(); aOmQ<N]a  
 } ^W0eRT  
} XU`vs`/   
|O*?[|`H  
HCURSOR CCaptureDlg::OnQueryDragIcon() ,,h>_IA  
{ h0-CTPQ7A  
 return (HCURSOR) m_hIcon; 'pT8S  
} c:-n0m'i  
2:1 kSR^Ky  
void CCaptureDlg::OnCancel() *3y_FTh8ra  
{ H<l0]-S{  
 if(bTray) <07~EP  
  DeleteIcon(); fTi5Ej*/?)  
  CDialog::OnCancel(); }x"8v&3CM_  
} ZP<OyX?  
sGGi7 %  
void CCaptureDlg::OnAbout() cu4|!s`#  
{ 3nx*M=  
 CAboutDlg dlg; l0%7u  
 dlg.DoModal(); zy8D&7Ytf  
} EV R>R  
|#22pq?RP  
void CCaptureDlg::OnBrowse() b Kr73S9  
{ 0E^S!A 7  
 CString str; |_16IEJ  
 BROWSEINFO bi; dF+:9iiAm  
 char name[MAX_PATH]; "iuNYM5 P  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); HQc^ybX5  
 bi.hwndOwner=GetSafeHwnd(); `OWwqLoeA  
 bi.pszDisplayName=name; %eJE@$  
 bi.lpszTitle="Select folder"; vZ|Wj] ;o  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *>jJ<8!  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); MVp+2@)}s  
 if(idl==NULL) t28 y=nv  
  return; `Oe}OSxnT  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); p$$0**p!`  
 str.ReleaseBuffer(); t'HrI-x  
 m_Path=str; ,'@t .XP  
 if(str.GetAt(str.GetLength()-1)!='\\') Nkk+*(Z  
  m_Path+="\\"; %p^`,b}  
 UpdateData(FALSE); B1J2m^  
} mHc5NkvQC  
gV-A+;u  
void CCaptureDlg::SaveBmp() 'c$)}R I7  
{ Az6tu <  
 CDC dc; ohPDknHp  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); FivqyT7i  
 CBitmap bm; |p*s:*TJp  
 int Width=GetSystemMetrics(SM_CXSCREEN); X>eFGCz}I  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0G8zFe*p  
 bm.CreateCompatibleBitmap(&dc,Width,Height); H|<Zm:.%$  
 CDC tdc; bqQR";  
 tdc.CreateCompatibleDC(&dc); 7Dz-xM_?  
 CBitmap*pOld=tdc.SelectObject(&bm); E<tJ8&IGk  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bDV/$@p  
 tdc.SelectObject(pOld); gnw?Y 2  
 BITMAP btm; "lKR~Qi  
 bm.GetBitmap(&btm); f<Y g_TG  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; wU&vkb)k  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Gi,4PD-ro  
 BITMAPINFOHEADER bih; DxG8`}+  
 bih.biBitCount=btm.bmBitsPixel; Y".4."NX  
 bih.biClrImportant=0; :a)`iJnb  
 bih.biClrUsed=0; W9jxw4)  
 bih.biCompression=0; 8LGNV&Edg  
 bih.biHeight=btm.bmHeight; OJ<V<=MYZ  
 bih.biPlanes=1; l'Uj"9r,  
 bih.biSize=sizeof(BITMAPINFOHEADER); {\n?IGP?wd  
 bih.biSizeImage=size; uiaZ@  
 bih.biWidth=btm.bmWidth; P:m6:F@hO  
 bih.biXPelsPerMeter=0; N[sJ5oF  
 bih.biYPelsPerMeter=0; Rrp-SR?O  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); A 7zL\U4  
 static int filecount=0; nZ# 0L`@"Y  
 CString name; _O`s;oc  
 name.Format("pict%04d.bmp",filecount++); yzyK$WN\[3  
 name=m_Path+name; Z (C0+A\  
 BITMAPFILEHEADER bfh; \mNN ) K@  
 bfh.bfReserved1=bfh.bfReserved2=0; &>vfm9  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Z \;{e'#o  
 bfh.bfSize=54+size; 1raq;^e9  
 bfh.bfOffBits=54; @ gjA8mL  
 CFile bf; e^orqw/I  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ oN=>U"<\1  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); bA/'IF+  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Z4D[nPm$  
  bf.WriteHuge(lpData,size); :+meaxbu  
  bf.Close(); cA B<'44R  
  nCount++; QJU\YH%}  
 } A%.ZesjAx  
 GlobalFreePtr(lpData); >]ZW.?1h  
 if(nCount==1) f_ |=EQ  
  m_Number.Format("%d picture captured.",nCount); M[7$F&&n  
 else rchKrw  
  m_Number.Format("%d pictures captured.",nCount); __,F_9M  
  UpdateData(FALSE); !OMl-:KUzE  
} /2:s g1  
1 ( rN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Tvd: P^ C  
{ {z |+ .D  
 if(pMsg -> message == WM_KEYDOWN) HD>UTX`&mc  
 { >yqFO  
  if(pMsg -> wParam == VK_ESCAPE) I"HA( +G  
   return TRUE; X> U _v  
  if(pMsg -> wParam == VK_RETURN) 0G(|`xG1q  
   return TRUE; *fQn!2}=(  
 } y`J8hawp  
 return CDialog::PreTranslateMessage(pMsg); 6K5mMu#4  
} qzi i[Mf  
8T3Nz8Q7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) k;l^y%tzp  
{ LMI7Ih;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5GDg_9Bz  
  SaveBmp(); 8Bx58$xRq  
  return FALSE; b-YmS=*  
} gm7 [m}  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $dF$-y<[0  
 CMenu pop; Z~ u3{  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); P5&8^YV`N  
 CMenu*pMenu=pop.GetSubMenu(0); {ukQBu#}<  
 pMenu->SetDefaultItem(ID_EXITICON); !twYjOryH[  
 CPoint pt; N;i\.oY  
 GetCursorPos(&pt); /NQ PTr  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); t/h,-x  
 if(id==ID_EXITICON) \/R $p  
  DeleteIcon(); 0t6DD  
 else if(id==ID_EXIT) Te7xj8<  
  OnCancel(); C(2kx4n  
 return FALSE; RSup_4A  
} pg{cZ1/  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); NF'<8{~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _Oy;:XN  
 AddIcon(); N,4hh?  
 return res; O[F  
} /&zlC{:G92  
1Hs'YzvY  
void CCaptureDlg::AddIcon() 5.QY{ +k  
{ I8{ mkh  
 NOTIFYICONDATA data; DC2[g9S>8@  
 data.cbSize=sizeof(NOTIFYICONDATA); K7wU tg  
 CString tip; h8icF}m  
 tip.LoadString(IDS_ICONTIP); [R<>3}50Y  
 data.hIcon=GetIcon(0); L$v<t/W  
 data.hWnd=GetSafeHwnd(); OuyO_DSI  
 strcpy(data.szTip,tip); 0N_u6*@  
 data.uCallbackMessage=IDM_SHELL; ku GaOO  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =4gPoS  
 data.uID=98; |2Uw8M7.E  
 Shell_NotifyIcon(NIM_ADD,&data); 3e)$<e  
 ShowWindow(SW_HIDE); {2U3   
 bTray=TRUE; )oy+-1dE  
} y-mjfW`n  
+QeA*L$~  
void CCaptureDlg::DeleteIcon() %+ytX]E  
{ uj+{ tc  
 NOTIFYICONDATA data; -x-EU#.G  
 data.cbSize=sizeof(NOTIFYICONDATA); 6_>(9&g`zV  
 data.hWnd=GetSafeHwnd(); 2Mj_wc   
 data.uID=98; >tm4Rg~y  
 Shell_NotifyIcon(NIM_DELETE,&data); %]N|?9L"=  
 ShowWindow(SW_SHOW); w|61dB  
 SetForegroundWindow(); m+xub*/  
 ShowWindow(SW_SHOWNORMAL); d2Ta&Md  
 bTray=FALSE; @?bY,  
} F12$BK DH  
|qpFR)l  
void CCaptureDlg::OnChange() S{N=9934_  
{ Ey{p;;H  
 RegisterHotkey(); SNSHX2  
} A[m<xtm5K  
co-1r/ -O  
BOOL CCaptureDlg::RegisterHotkey() $Ww.^ym  
{ RSCQ`.  
 UpdateData(); Hp[i8PJ  
 UCHAR mask=0; uzIM?.H  
 UCHAR key=0; Tt4Q|"CJA  
 if(m_bControl) 0{-?Wy  
  mask|=4; #X2wy$GTG  
 if(m_bAlt) IUz`\BO4  
  mask|=2; S2>$S^[U  
 if(m_bShift) HQMug  
  mask|=1; /z:1nq  
  key=Key_Table[m_Key.GetCurSel()]; o $'K}U  
 if(bRegistered){ 0S$TLbx  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ?RS4oJz,5g  
  bRegistered=FALSE; _}.WRFIJ@L  
 } p5l|qs  
 cMask=mask; C$4{'J-ZH  
 cKey=key; H'Jz:6   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3Pvz57z{  
 return bRegistered; $GYy[8{:V  
} G+<id1  
yw{r:fy  
  四、小结 ~zVe?(W  
 /#zs  
  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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