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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: VaKBS/y"  
  Rf*cW&}%  
  一、实现方法 !| ObNS  
o m9zb&{tu  
  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: 3jx5Lou)&  
1:{BC2P  
#pragma data_seg("shareddata") y?Vsp<  
HHOOK hHook =NULL; //钩子句柄 ";vP77|m7R  
UINT nHookCount =0; //挂接的程序数目 R|tf}~u !x  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 aG&ay3[&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 d^-sxl3}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey R8"qDj  
static int KeyCount =0; v>ygr8+C,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ..u2IdEu  
#pragma data_seg() BBkYc:B=SA  
EGD&/%aC  
  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。 N5]}m:"pk  
~m0l_:SF  
  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: *21foBfqh  
b`%(.&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |-vc/t2k>T  
cKey,UCHAR cMask) hlIh(\JZ4s  
{ Y#[Wv1hi  
 BOOL bAdded=FALSE; .LQvjK[N  
 for(int index=0;index<MAX_KEY;index++){ fG{ 9doUD  
  if(hCallWnd[index]==0){ Aw~N"i  
   hCallWnd[index]=hWnd; >n!,KUu]  
   HotKey[index]=cKey; E 0k1yA  
   HotKeyMask[index]=cMask; estDW1i)  
   bAdded=TRUE; 335\0~;3  
   KeyCount++; xW hi>  
   break; W'0(0;+G/j  
  } N7}Y\1-8  
 } $d[ -feU  
 return bAdded; DnY7$']"|  
} ,sn/FT^; q  
//删除热键 -( d,AX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3 J{hG(5  
{ cag9f?w@V  
 BOOL bRemoved=FALSE; !Eof7LUE  
 for(int index=0;index<MAX_KEY;index++){ v<2B^(i}VB  
  if(hCallWnd[index]==hWnd){ fxR}a,a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ n-%8RV  
    hCallWnd[index]=NULL; jT6zpi~]E  
    HotKey[index]=0; q%^vx%aL\  
    HotKeyMask[index]=0; .*0`}H+_  
    bRemoved=TRUE; c[a1 Md&  
    KeyCount--; lMcSe8LBQa  
    break; Dq~PxcnI  
   } 1!;}#m7v  
  } 9YtdE*,k  
 } cdH Ug#  
 return bRemoved; m4@f&6x  
} /nX+*L}d/  
*C0gpEf9S  
qL\*rYe<  
  DLL中的钩子函数如下: cuw3}4m%  
&dC #nw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /G>reG,G  
{ /_,} o7@t~  
 BOOL bProcessed=FALSE; o4Bl!7U  
 if(HC_ACTION==nCode) ElEa*70~g  
 { #=MQE  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 T21SuM  
   switch(wParam) rCmxv7" a}  
   {  fGv`.T_d  
    case VK_MENU: >VAZ^kgi  
     MaskBits&=~ALTBIT; ? }k~>. \  
     break; -CTsB)=\,  
    case VK_CONTROL: 1qs~[7{C1  
     MaskBits&=~CTRLBIT;  xYMNyj~  
     break; GC3:ZpV`  
    case VK_SHIFT: ~YuRi#CTD:  
     MaskBits&=~SHIFTBIT; j=^b'dyL  
     break; P7Th 94  
    default: //judge the key and send message IXSCYqoK  
     break; LRhq%7p7  
   } (VPT% l6  
   for(int index=0;index<MAX_KEY;index++){ 9iQcK&D 2  
    if(hCallWnd[index]==NULL) u&=SZX&G k  
     continue; ,u}n!quA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,x+_/kqx  
    { Lp \%-s#5s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?-FSDNQ  
     bProcessed=TRUE; 4*UoTE-g$  
    } u1 uu_*  
   } t9&z|?Vz  
  } lQ%]](a6  
  else if((lParam&0xc000ffff)==1){ //有键按下 I(8,D[G.m  
   switch(wParam) .P=uR8  
   { ? OBe!NDf  
    case VK_MENU: eiZv|?^0  
     MaskBits|=ALTBIT; V*l0| ,9  
     break; P,"z  
    case VK_CONTROL: -Uz xs5Zl  
     MaskBits|=CTRLBIT; 7"f$;CN?~  
     break; :):=KowI  
    case VK_SHIFT: D PnKr/  
     MaskBits|=SHIFTBIT; z[Kxy1,  
     break; SaEe7eHd  
    default: //judge the key and send message ?lb1K'(  
     break; )o[ O%b  
   } DYH-5yX7  
   for(int index=0;index<MAX_KEY;index++){ `n:IXD5'  
    if(hCallWnd[index]==NULL) oll~|J^sg  
     continue; Do(7LidC5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FTt7o'U  
    { L{~L6:6An  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vi0% jsI  
     bProcessed=TRUE; jh]wHG  
    } IxCEE5+`%  
   } dUn8Xqj1  
  } @yaBtZUp3  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 n?pCMS|  
   for(int index=0;index<MAX_KEY;index++){ >"F~%D<.  
    if(hCallWnd[index]==NULL) bF' ~&<c  
     continue; 0|{U"\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2 < &-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m7kDxs(KO  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 7F`QN18>(  
   } $X9Ban]  
  } X3]E8)645N  
 } 9Pd~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _dsd{&  
} T] EXm/  
5]; 8  
  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: $7)O&T*q'  
*^c4q|G.-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @D"#B@j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D5T\X-+]O  
FTCp3g  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: GQ|kcY=  
[p!C+ |rro  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) FEaf&'G]  
{ [X^JV/R  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) y%TR2CvT  
 { 7L;yN..0  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Ffj:xZ9rk  
  SaveBmp(); lbg6n:@  
  return FALSE; h#]}J}si  
 } #A]7cMZ'W  
 …… //其它处理及默认处理 &O0+\A9tP  
} pJa FPO..|  
@dCu]0oNI  
dN |w;|M  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 {k?Y :  
CM5A-R90  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 d*A>P  
&1Cq+YpI  
  二、编程步骤 Q^MB%L;D  
82J0t}:U  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; >j`*-(`2fa  
 b 1[U 9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; "mPa >`?  
F|P2\SPL  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; j~Gu;%tq  
Ac7`nvI=  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; (sqS(xIY  
&g& &-=7)  
  5、 添加代码,编译运行程序。 qFs<s<]  
YD+C1*c!  
三、程序代码 [ThzLk#m  
S~TJF}[k^6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ix#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  C|lMXp\*  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ a<o0B{7{BM  
#if _MSC_VER > 1000 /N^+a-.Qd  
#pragma once V3+%KkN  
#endif // _MSC_VER > 1000 'P Yl%2  
#ifndef __AFXWIN_H__ 5:PZ=jPR  
#error include 'stdafx.h' before including this file for PCH [`b{eLCFX]  
#endif i,<-+L$z  
#include "resource.h" // main symbols -qEr-[z  
class CHookApp : public CWinApp #[xNE C)  
{ '9[_ w$~(  
 public: iB,*X[}EqG  
  CHookApp(); LPNv4lT[u  
  // Overrides mzw*6e2T  
  // ClassWizard generated virtual function overrides e5/_Vga  
  //{{AFX_VIRTUAL(CHookApp) ri^yal<'  
 public: JQ1VCG  
  virtual BOOL InitInstance(); .) GVb<w  
  virtual int ExitInstance(); SeTU`WLEm  
  //}}AFX_VIRTUAL |S8pq4eKJ_  
  //{{AFX_MSG(CHookApp) ;i:7E#@  
  // NOTE - the ClassWizard will add and remove member functions here. ' #mC4\<W8  
  // DO NOT EDIT what you see in these blocks of generated code ! FV9RrI2  
  //}}AFX_MSG HkN +:  
  DECLARE_MESSAGE_MAP() Rta P+6'X  
}; MDq@:t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); +vnaEy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KqUFf@W  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xVe!  
BOOL InitHotkey(); 7.t$#fzi  
BOOL UnInit(); '8JaD6W9S  
#endif : L>d]Hn  
5e LPn  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. YH>n{o;- ?  
#include "stdafx.h" FN R& :  
#include "hook.h" gkdjH8(2  
#include <windowsx.h> 3YRzBf:h  
#ifdef _DEBUG r__M1 !3  
#define new DEBUG_NEW 2P=;r:cx  
#undef THIS_FILE N#:"X;  
static char THIS_FILE[] = __FILE__; 'yNp J'  
#endif ^n]s}t}csV  
#define MAX_KEY 100 J\*d4I<(Rt  
#define CTRLBIT 0x04 uprQy<I@  
#define ALTBIT 0x02 ZZ(@:F  
#define SHIFTBIT 0x01 24Fxx9 g  
#pragma data_seg("shareddata") *8p</Q  
HHOOK hHook =NULL; GM/1u fZH  
UINT nHookCount =0; iiTUhO )  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey qrkT7f  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [ n2udV  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey \) ;rOqh  
static int KeyCount =0; X@)lPr$a  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift +\%zy=  
#pragma data_seg() nGVqVSxKT  
HINSTANCE hins; M@\'Y$)Y{  
void VerifyWindow(); p"@|2a  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -ZB"Yg$l  
//{{AFX_MSG_MAP(CHookApp) K?4(ou  
// NOTE - the ClassWizard will add and remove mapping macros here. =-qsz^^a-  
// DO NOT EDIT what you see in these blocks of generated code! X3[!xMij  
//}}AFX_MSG_MAP Nt8(  
END_MESSAGE_MAP() KB = z{g  
I,eyL$x  
CHookApp::CHookApp() z@i4dC  
{ v(iUo&Ge  
 // TODO: add construction code here, 0pFHE>  
 // Place all significant initialization in InitInstance K^H t$04  
} "}! rM6 h  
3o>t ~Sfi  
CHookApp theApp; tOw 0(-:iq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) T8-$[ 2  
{ fR%8?6  
 BOOL bProcessed=FALSE; .KN]a"]  
 if(HC_ACTION==nCode) e`r;`a&  
 { cy4'q ?r  
  if((lParam&0xc0000000)==0xc0000000){// Key up #A; Z4jK  
   switch(wParam) ]aNnY?qW5  
   { h86={@Le  
    case VK_MENU: L])w-  
     MaskBits&=~ALTBIT; _GqE'VX  
     break; E 6: p  
    case VK_CONTROL: "zbE  
     MaskBits&=~CTRLBIT; : qRT9n$  
     break; Tm52=+uf$  
    case VK_SHIFT: $x;h[,y   
     MaskBits&=~SHIFTBIT; ?LI9F7n  
     break; V%lGJ]ZEa  
    default: //judge the key and send message aUK4{F ;  
     break; Nl`ry2"<  
   } yipD5,TC  
   for(int index=0;index<MAX_KEY;index++){  2p>SB/  
    if(hCallWnd[index]==NULL) t [hocl/6  
     continue; 'hO;sL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N?0y<S ?!  
    { RWCS u$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); + f!,K  
     bProcessed=TRUE; V(LFH9.Mp  
    } W"(`n4hi3  
   } AijTT%  
  } t<F]%8S  
  else if((lParam&0xc000ffff)==1){ //Key down Z&jb,eh2  
   switch(wParam) ROS"VV<  
   {  ii y3  
    case VK_MENU: E5G"QnxR>N  
     MaskBits|=ALTBIT; {@__%=`CCS  
     break; 6L9[U^`@  
    case VK_CONTROL: aGb. Lh9  
     MaskBits|=CTRLBIT; jUvA<r  
     break; @B[Cc`IN"  
    case VK_SHIFT: _/~ ,a  
     MaskBits|=SHIFTBIT; zL`uiZl  
     break; V}fKV6 v9  
    default: //judge the key and send message : 5<9/  
     break; o Xi}@  
   } ]/Yy-T#@  
   for(int index=0;index<MAX_KEY;index++) D%UZ'bHN*  
   { )nHE$gVM s  
    if(hCallWnd[index]==NULL) )S};k=kG  
     continue; 4:&qT Y)H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _T|H69 J  
    { ct4 [b|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Yz-JI=  
     bProcessed=TRUE; 5%?b5(mnD  
    } Nv?-*&L  
   } Ldhk^/+  
  } 6w"( y~c1  
  if(!bProcessed){ DwmU fZp  
   for(int index=0;index<MAX_KEY;index++){ 2k}-25xxL  
    if(hCallWnd[index]==NULL) ,ah*!Zm.kk  
     continue; I+"?,Ej$K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) MziZN^(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Ft;u\KT  
   } ^@`e  
  } ;=-j;x  
 } F|?+>c1}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Z@,PZ   
} S6T!qH{6  
=^Sw*[eiy  
BOOL InitHotkey() ?QMclzh*-  
{ l{6` k<J(  
 if(hHook!=NULL){ ZEj!jWP2m  
  nHookCount++; inPE/Ux  
  return TRUE; ]A]Ft!`6z  
 } z^rhgs?4  
 else b H"}w$!>r  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %l:|2s:  
  if(hHook!=NULL) Du^x=;  
   nHookCount++; +[whh  
  return (hHook!=NULL); cZe'!CQS  
} g=xv+e  
BOOL UnInit() GG_^K#*  
{ 22GnbA7O  
 if(nHookCount>1){ )WVItqQKV  
  nHookCount--; QJ#u[hsMFp  
  return TRUE; < TR/ `  
 } 2y+70(E1  
 BOOL unhooked = UnhookWindowsHookEx(hHook); QB/7/PW{H\  
 if(unhooked==TRUE){ #vj#! 1  
  nHookCount=0; 4ZI!,lv*  
  hHook=NULL; `6Ureui2?  
 } xd^&_P$=  
 return unhooked; e&$p-0DmT|  
} 3@^>#U   
~$4]HDg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IXZ(]&we  
{ xH<'GB)  
 BOOL bAdded=FALSE; T-9k<,>?  
 for(int index=0;index<MAX_KEY;index++){ *o02!EYge  
  if(hCallWnd[index]==0){ F!7f_m0=  
   hCallWnd[index]=hWnd; k42b:W5%  
   HotKey[index]=cKey; pi`;I*f/  
   HotKeyMask[index]=cMask; 5v|H<wPp  
   bAdded=TRUE; K??1,I  
   KeyCount++; Hp\Ddx >Jd  
   break; #)GW}U]X  
  } /M3y)K`^  
 } })@tA<+  
 return bAdded; jg[5UTkcs  
} W|ReLM\  
I"ca+4]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u4:\UC'  
{ %_R$K#T^,  
 BOOL bRemoved=FALSE; EdEoXY-2  
 for(int index=0;index<MAX_KEY;index++){ PzjaCp'  
  if(hCallWnd[index]==hWnd){ 79D=d'e A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ a3Y{lc#z}  
    hCallWnd[index]=NULL; ^J8uhV;w  
    HotKey[index]=0; ql^g~b  
    HotKeyMask[index]=0; "YJ[$TG  
    bRemoved=TRUE; DU;[btK>  
    KeyCount--; h$70H^r  
    break; B &?fM~J  
   } BI};"y  
  } dFQ o  
 } AHwG<k  
 return bRemoved; C\ vC?(n  
} ,j y<o+!  
*C\(wL  
void VerifyWindow() ~LbS~_\C=  
{ mj@31YW  
 for(int i=0;i<MAX_KEY;i++){ BDy5J2<<7l  
  if(hCallWnd!=NULL){ B/mYoK  
   if(!IsWindow(hCallWnd)){ 6 }!Z"  
    hCallWnd=NULL; wepwX y"  
    HotKey=0; Sk\n;mL:  
    HotKeyMask=0; 9RQU?  
    KeyCount--; _#!U"hkH  
   } \PbvN\L  
  } ?q _^Rj$  
 } jv =EheD  
} O~27/  
["a"x>X&  
BOOL CHookApp::InitInstance() 03EV%Vc  
{ .n`( X#,*l  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~.Cv DJy  
 hins=AfxGetInstanceHandle(); o'Wz*oY))\  
 InitHotkey(); 2ev*CX6.  
 return CWinApp::InitInstance(); 1a$IrQE  
} J!hFN]M<<  
w2{g,A|  
int CHookApp::ExitInstance() f#$|t>  
{ @QdnjXII*  
 VerifyWindow(); *%\mZ,s"  
 UnInit(); :"QfF@Z{  
 return CWinApp::ExitInstance(); pYo=oI  
} zrRFn `B  
NvJV</l6 A  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file eY,O@'"8`  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +;Cr];b3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %2"J:0j  
#if _MSC_VER > 1000 c~imE%  
#pragma once rp's  
#endif // _MSC_VER > 1000 JoZ(_Jh%m  
c2 Aps  
class CCaptureDlg : public CDialog E.`6oX\L|  
{ *k [J6  
 // Construction .[:VSM7T  
 public: \X|sU:g  
  BOOL bTray; iWA|8$u4gm  
  BOOL bRegistered; 6>`c1 \8f  
  BOOL RegisterHotkey(); O_;Dk W  
  UCHAR cKey; IP3E9z_ L  
  UCHAR cMask; !eI2 r   
  void DeleteIcon(); $q_R?Eay  
  void AddIcon(); *?t%0){  
  UINT nCount; MS3=~*+  
  void SaveBmp(); y(W|eBe  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor DM{ 4@*]  
  // Dialog Data wN=;i#  
  //{{AFX_DATA(CCaptureDlg) %lw! e  
  enum { IDD = IDD_CAPTURE_DIALOG }; upy\gkpnGO  
  CComboBox m_Key; IH9.F  
  BOOL m_bControl; Hfym30  
  BOOL m_bAlt; (MLwQiop  
  BOOL m_bShift; ABh&X+YD  
  CString m_Path; 0bS|fMgc  
  CString m_Number; r'GP$0rr9!  
  //}}AFX_DATA O|kOI?f  
  // ClassWizard generated virtual function overrides 5jB* fIz  
  //{{AFX_VIRTUAL(CCaptureDlg) NSQp< m  
 public: J h&~ToF!  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Q~{H@D`<  
 protected: YW/QC'_iC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 47K1$3P  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); TZR)C P5  
  //}}AFX_VIRTUAL 5=|hC3h  
  // Implementation v'!a\b`9  
 protected: J aTp} #  
  HICON m_hIcon; p5r]J+1  
  // Generated message map functions 7!WA)@6  
  //{{AFX_MSG(CCaptureDlg) q 11IkDa  
  virtual BOOL OnInitDialog(); 1KM`i  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ;!!n{l$r'  
  afx_msg void OnPaint(); gKYfQ+  
  afx_msg HCURSOR OnQueryDragIcon(); ~Wo)?q8UY,  
  virtual void OnCancel(); f y:,_#  
  afx_msg void OnAbout(); G 0%6ch^%  
  afx_msg void OnBrowse(); L|P5=/d  
  afx_msg void OnChange(); y){ k3lm0  
 //}}AFX_MSG }G4 z tiuG  
 DECLARE_MESSAGE_MAP() Od4E x;F  
}; /DQaGq/Ld  
#endif /+Lfrt  
3b'QLfU&#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~T&<CTh  
#include "stdafx.h" if|+EN%  
#include "Capture.h" Lzu.)C@Amx  
#include "CaptureDlg.h" q\m2EURco  
#include <windowsx.h> S4=~`$eP  
#pragma comment(lib,"hook.lib") &wD;SMr<  
#ifdef _DEBUG 1N7Kv4,  
#define new DEBUG_NEW 91 =OF*w  
#undef THIS_FILE KD`IX-r{s  
static char THIS_FILE[] = __FILE__; + s- lCz  
#endif ~0beuK&p  
#define IDM_SHELL WM_USER+1 +qh[N@F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yKYTi3_(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `c<;DhNO  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; yE}}c{hSn  
class CAboutDlg : public CDialog *h}XWBC1q  
{ M$Zcn#A  
 public: yzqVz_Fi*W  
  CAboutDlg(); (M*FIX  
  // Dialog Data +=O5YR!{  
  //{{AFX_DATA(CAboutDlg) !%"8|)CAr  
  enum { IDD = IDD_ABOUTBOX }; gb H<]?  
  //}}AFX_DATA l c+g&f  
  // ClassWizard generated virtual function overrides .zi_[  
  //{{AFX_VIRTUAL(CAboutDlg) "?V0$-DR  
 protected: {phNds%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support XUz3*rfs  
  //}}AFX_VIRTUAL <YdE1{fm  
  // Implementation O8h%3&  
 protected: :]\([Q+a  
  //{{AFX_MSG(CAboutDlg) a!=D[Gz*5  
  //}}AFX_MSG <1uZa  
  DECLARE_MESSAGE_MAP() ,P;Pm68V  
}; 7@D@ucL  
[ucpd  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Qk:Y2mL  
{ vX/T3WV  
 //{{AFX_DATA_INIT(CAboutDlg) JpXlBEio%  
 //}}AFX_DATA_INIT Lm%:K]X  
} jPUwSIP  
KrQ1GepJ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) e)d`pQ6  
{ U~:-roQ(\  
 CDialog::DoDataExchange(pDX); { \81i8b]  
 //{{AFX_DATA_MAP(CAboutDlg) j0oR) du  
 //}}AFX_DATA_MAP 1q7|OWFT  
} ,U2*FZ["  
Q+[n91ey**  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4K\G16'$v  
 //{{AFX_MSG_MAP(CAboutDlg) 3LOdjT J  
 // No message handlers LRL,m_gt  
 //}}AFX_MSG_MAP 4h|c<-`>t  
END_MESSAGE_MAP() +S o4rA*9  
IxY|>5z  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) X% t1 T4  
: CDialog(CCaptureDlg::IDD, pParent) 8A##\j )  
{ MTuV^0%jD  
 //{{AFX_DATA_INIT(CCaptureDlg) g6j?,c|y  
  m_bControl = FALSE; ]Sf]J4eQ  
  m_bAlt = FALSE; >qnko9V  
  m_bShift = FALSE; *4\:8  
  m_Path = _T("c:\\"); TM%| '^)  
  m_Number = _T("0 picture captured."); jeoz* Dz  
  nCount=0; 01t1Z}!y  
  bRegistered=FALSE; marQNZ  
  bTray=FALSE; E(>=rD/+  
 //}}AFX_DATA_INIT u^^[Q2LDU}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 oH97=>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); L/$H"YOv  
} 0CnOL!3.I  
we;-~A5J  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) W=N+VqK  
{ n(1l}TJy  
 CDialog::DoDataExchange(pDX); ,LHn90S  
 //{{AFX_DATA_MAP(CCaptureDlg) <sb~ ^B  
  DDX_Control(pDX, IDC_KEY, m_Key); =W(Q34  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); kMIcK4.MH  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *& BQTZ6  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?1~`*LE  
  DDX_Text(pDX, IDC_PATH, m_Path); Vh|*p&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); f z'@_4hg  
 //}}AFX_DATA_MAP |mZxfI  
} p $S*dr  
$0W|26;  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) zfJT,h-{  
//{{AFX_MSG_MAP(CCaptureDlg) x]}^v#  
 ON_WM_SYSCOMMAND() zVViLUwG  
 ON_WM_PAINT() x[ SDl(<@;  
 ON_WM_QUERYDRAGICON() w'>pY  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .73X3`P25  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Hus)c3Ty7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) owVX*&b{  
//}}AFX_MSG_MAP /:cd\A}  
END_MESSAGE_MAP() OAgniLv  
u+9hL4  
BOOL CCaptureDlg::OnInitDialog() \[;0 KV_  
{ k$n|*kCh  
 CDialog::OnInitDialog(); )*u8/U  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &h}#HS>l  
 ASSERT(IDM_ABOUTBOX < 0xF000); W_JlOc!y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); tR# OjkvX  
 if (pSysMenu != NULL) aS>u,=C  
 { &sl0W-;0  
  CString strAboutMenu; bTI|F]^!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .#EFLXs  
  if (!strAboutMenu.IsEmpty())  {y)=eX9  
  { 'lH|eU&-  
   pSysMenu->AppendMenu(MF_SEPARATOR); Z3Og=XHR  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); l5~os>  
  } ko!)s  
 } jVEGj5F;N  
 SetIcon(m_hIcon, TRUE); // Set big icon rjK%t|aV^  
 SetIcon(m_hIcon, FALSE); // Set small icon %U/(|wodd  
 m_Key.SetCurSel(0); F/ ]2G^-  
 RegisterHotkey(); |NlO7aQ>2H  
 CMenu* pMenu=GetSystemMenu(FALSE); 91/Q9xY  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \P[Y`LYL  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); z[ N`s$;  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [:dY0r+  
 return TRUE; // return TRUE unless you set the focus to a control 82+r^t/.  
} s9 mx  
-oGdk|Yn  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) TP*hd  
{ h0EEpL|\  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 'B |JAi?  
 { j;zM{qu_  
  CAboutDlg dlgAbout; yWmJ~/*lG  
  dlgAbout.DoModal(); *tA1az-jO  
 } I^.Om])  
 else 3<Lx&p~%T  
 { Z{*\S0^ST  
  CDialog::OnSysCommand(nID, lParam); #<fRE"v:Q  
 } i$Ul(?  
} RU|Q ]Ymx  
1er TldX  
void CCaptureDlg::OnPaint() }CSDV9).S  
{ 9 ql~q  
 if (IsIconic()) `bq<$e  
 { hPB9@ hT$  
  CPaintDC dc(this); // device context for painting HZE#Ab*L  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); iI T;K@&  
  // Center icon in client rectangle M/f<A$xx_  
  int cxIcon = GetSystemMetrics(SM_CXICON); AYBns]!  
  int cyIcon = GetSystemMetrics(SM_CYICON); C[cbbp  
  CRect rect; zpn9,,~u  
  GetClientRect(&rect); yZY\MB/  
  int x = (rect.Width() - cxIcon + 1) / 2; gjyYCjF  
  int y = (rect.Height() - cyIcon + 1) / 2; e+7"/icK  
  // Draw the icon j^sg6.Z*  
  dc.DrawIcon(x, y, m_hIcon); J3V= 46Yc  
 } ;?Tbnn Wn  
 else l\H=m3Bg  
 { 3DX*gsx(  
  CDialog::OnPaint(); [\e eDa  
 } <dWv?<o  
} {lzWrUGO  
KfEx"94  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1ba~SHi  
{ bSlF=jT[S  
 return (HCURSOR) m_hIcon; |*xA 8&/  
} rgQOj^xKv^  
C[AqFo  
void CCaptureDlg::OnCancel() L[fiU0^o  
{ !PlEO 2at  
 if(bTray) _yx>TE2e  
  DeleteIcon(); O/(`S<iip  
  CDialog::OnCancel(); t>RY7C;PuS  
} net@j#}j-  
@i_FTN  
void CCaptureDlg::OnAbout() <$$yw=ef  
{ O:R*rJ  
 CAboutDlg dlg; gs[uD5oo<  
 dlg.DoModal(); qPK*%Q<;  
} w~A{(- dx  
~s*)f.l  
void CCaptureDlg::OnBrowse() e7Z32P0ls  
{ Xm}/0g&7  
 CString str; ~O0 $Suv  
 BROWSEINFO bi;  hoUD;3  
 char name[MAX_PATH]; I\{ 1u  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); u#$]?($}d  
 bi.hwndOwner=GetSafeHwnd(); <tNBxa$gS  
 bi.pszDisplayName=name; 5E;qM|Ns  
 bi.lpszTitle="Select folder"; kk@fL  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  SI-qC  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); |(E FY\  
 if(idl==NULL) F=e8IUr  
  return; 9gDkTYkj  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); T{.pM4Hd  
 str.ReleaseBuffer(); ox~o J|@  
 m_Path=str; m)t;9J5  
 if(str.GetAt(str.GetLength()-1)!='\\') p!7FpxZY  
  m_Path+="\\"; m@2QnA[ 4  
 UpdateData(FALSE); q4:o#K#  
} @ $ ;q ;  
6:[dj*KGmT  
void CCaptureDlg::SaveBmp() rdP[<Y9  
{ 5y [Oj^  
 CDC dc; uM IIYS  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); JN-y)L/>  
 CBitmap bm; HZC"nb}r4  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3 *"WG O5  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]?kZni8j_  
 bm.CreateCompatibleBitmap(&dc,Width,Height); l'-Bu(  
 CDC tdc; $oID(P  
 tdc.CreateCompatibleDC(&dc); u<tbbKM  
 CBitmap*pOld=tdc.SelectObject(&bm); *=/ { HvJ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); {9&;Q|D z  
 tdc.SelectObject(pOld); W.f/pu  
 BITMAP btm; &tLgG4pd  
 bm.GetBitmap(&btm); TOB-aAO  
 DWORD size=btm.bmWidthBytes*btm.bmHeight;  NI76U  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); UT~4x|b:O  
 BITMAPINFOHEADER bih; JxdDC^> 0  
 bih.biBitCount=btm.bmBitsPixel; {tuYs:  
 bih.biClrImportant=0; 2>xF){`  
 bih.biClrUsed=0; o4F2%0gJ  
 bih.biCompression=0; a od-3"7[  
 bih.biHeight=btm.bmHeight; r[`9uVT/  
 bih.biPlanes=1; u"cV%(#  
 bih.biSize=sizeof(BITMAPINFOHEADER); VGy<")8D/  
 bih.biSizeImage=size; Ha0M)0Anv  
 bih.biWidth=btm.bmWidth; *SbMqASv4G  
 bih.biXPelsPerMeter=0; ,GbR!j@6  
 bih.biYPelsPerMeter=0; B[Ku\A6&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;40/yl3r3[  
 static int filecount=0; {Qf=G|Ah  
 CString name; Pe_W;q.  
 name.Format("pict%04d.bmp",filecount++); :1. L}4"gg  
 name=m_Path+name; #?U}&Bd  
 BITMAPFILEHEADER bfh; p SH=%u>  
 bfh.bfReserved1=bfh.bfReserved2=0; 8?#/o c  
 bfh.bfType=((WORD)('M'<< 8)|'B'); .GP T!lDc  
 bfh.bfSize=54+size; -n~1C {<  
 bfh.bfOffBits=54; E1aHKjLQ  
 CFile bf; r4b 6 c  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ T9E+\D  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); r ,8 [O  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); bivuqKA  
  bf.WriteHuge(lpData,size); lBLARz&c#  
  bf.Close(); #>("CAB02T  
  nCount++; %8B}Cb&2c  
 } oj m @t  
 GlobalFreePtr(lpData); <y('hI'  
 if(nCount==1) y4 #>X  
  m_Number.Format("%d picture captured.",nCount); d=$Mim  
 else j;+b0(53  
  m_Number.Format("%d pictures captured.",nCount); @|Cz-J;D  
  UpdateData(FALSE); h9&0Z +zs  
} + /4A  
13$%,q)  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )Yh+c=6 ?  
{ 3)t.p>VgO  
 if(pMsg -> message == WM_KEYDOWN) ^,lIK+#Elz  
 { kr^P6}'  
  if(pMsg -> wParam == VK_ESCAPE) fZGX}T<)p-  
   return TRUE; :%_LpZ  
  if(pMsg -> wParam == VK_RETURN) ;>U2|>5V  
   return TRUE; WH#1 zv  
 } wy<S;   
 return CDialog::PreTranslateMessage(pMsg); kf\PioD8  
} 6##_%PO<m  
TM__I\+Q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) IEL%!RFG  
{ {K~'K+TPu  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P8OaoPj  
  SaveBmp(); 59 T 8r  
  return FALSE; x xHY+(m  
} UP$.+<vm  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 1SQ3-WU s  
 CMenu pop; wyH[x!QX  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); gs^Xf;g vI  
 CMenu*pMenu=pop.GetSubMenu(0); VD;01"#'  
 pMenu->SetDefaultItem(ID_EXITICON); ~TF:.8  
 CPoint pt; { T/[cu<  
 GetCursorPos(&pt); ]#i igPZ7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Fk&c=V;SU  
 if(id==ID_EXITICON) 2lZ Q)   
  DeleteIcon(); np|Sy;:  
 else if(id==ID_EXIT) E<rp7~#  
  OnCancel(); g.k"]lP  
 return FALSE; ^ox=HNV  
} sU<Wnz\[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); d(ZO6Nr Q  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) % :f&.@'r  
 AddIcon(); (q/e1L-S  
 return res; w0 M>[ 4  
} >%_\;svZG  
+zqn<<9  
void CCaptureDlg::AddIcon() q_:4w$>  
{ SBu"3ym  
 NOTIFYICONDATA data; \k7"=yx  
 data.cbSize=sizeof(NOTIFYICONDATA); /aCc17>2V{  
 CString tip; #Qw0&kM7I  
 tip.LoadString(IDS_ICONTIP); @-07F,'W,  
 data.hIcon=GetIcon(0); .|KyNBn  
 data.hWnd=GetSafeHwnd(); Hzm:xg  
 strcpy(data.szTip,tip); tn\yI!a  
 data.uCallbackMessage=IDM_SHELL; '`[&}R  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; JJ-( Sl  
 data.uID=98; zy?|ODM  
 Shell_NotifyIcon(NIM_ADD,&data); sPpH*,(  
 ShowWindow(SW_HIDE); e-/&$Qq  
 bTray=TRUE; ^]Y> [[  
} BGZ#wru  
(*9$`!wS  
void CCaptureDlg::DeleteIcon() c% -Tem'#  
{ 'T;P;:!\  
 NOTIFYICONDATA data; JAnZdfRt  
 data.cbSize=sizeof(NOTIFYICONDATA); .&iawz  
 data.hWnd=GetSafeHwnd(); 4}baSV  
 data.uID=98; %bn jgy  
 Shell_NotifyIcon(NIM_DELETE,&data); mkk6`,ov  
 ShowWindow(SW_SHOW); \[i1JG  
 SetForegroundWindow(); 7vKK%H_P  
 ShowWindow(SW_SHOWNORMAL); lN 4oW3QT  
 bTray=FALSE; V*;(kEqj  
} hp50J  
QD&`^(X1p  
void CCaptureDlg::OnChange() 2eS~/Pq5=i  
{ &{n.]]%O.  
 RegisterHotkey(); ] )\Pqn(  
} Lnl(2xD  
Y=?3 js?O  
BOOL CCaptureDlg::RegisterHotkey() /N10  
{ vzAaxk%  
 UpdateData(); ]L.O8  
 UCHAR mask=0; 9!\B6=r y4  
 UCHAR key=0; r.&Vw|*>  
 if(m_bControl) #$07:UJ  
  mask|=4; Hyl%mJ  
 if(m_bAlt) 9d659i C  
  mask|=2; <oV(7  
 if(m_bShift) s WvBv  
  mask|=1; WIxy}3_to  
  key=Key_Table[m_Key.GetCurSel()]; e{K 215  
 if(bRegistered){ R4cM%l_#W  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]y '>=a|T  
  bRegistered=FALSE; w+|L+h3L7  
 } %)W2H^  
 cMask=mask;  skViMo  
 cKey=key; lvz7#f L~  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }!r|1$,kL  
 return bRegistered; _7 L-<  
} @o _}g !9=  
"?xHlYj@+  
  四、小结 =s2*H8]  
Qn.om=KDs@  
  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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