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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: S;NChu?8  
  0K>rc1dy  
  一、实现方法 w3Aq[1U0  
9 pE)S^P  
  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: %8`zaa  
95(c{ l/  
#pragma data_seg("shareddata") GiHJr1  
HHOOK hHook =NULL; //钩子句柄 ^i&Qr+v  
UINT nHookCount =0; //挂接的程序数目 )ZzwD]  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]]o7ej  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 i051qpj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey vq$%Ug/B  
static int KeyCount =0; \F,?ptu  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ;1S{xd*^N  
#pragma data_seg() GW'=/ z7  
6v GcM3M  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 V)R-w`  
GK/a^[f+'l  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: \^EjE  
eC9~ wc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ]=9%fA  
cKey,UCHAR cMask) q "bpI8j  
{ 598 xV|TON  
 BOOL bAdded=FALSE; x)G/YUv76  
 for(int index=0;index<MAX_KEY;index++){ L3Ry#uw  
  if(hCallWnd[index]==0){ =N<Hc:<t4  
   hCallWnd[index]=hWnd; T1PWFw\GH  
   HotKey[index]=cKey; <y*#[:i  
   HotKeyMask[index]=cMask; 8 /b_4!5c  
   bAdded=TRUE; 0'^? m$  
   KeyCount++; HT A-L>Cee  
   break; OI %v>ns  
  } )U<4ul  
 } yN{Ybp  
 return bAdded; y$*?k0=ZX  
} PNT.9 *d  
//删除热键 w|Zq5|[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) aEXV^5;,pJ  
{ \#tr4g~u  
 BOOL bRemoved=FALSE; qfC9 {gu  
 for(int index=0;index<MAX_KEY;index++){ 0J$wX yh  
  if(hCallWnd[index]==hWnd){ 4}580mBc  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ f: 7Y  
    hCallWnd[index]=NULL; ++,mM7a  
    HotKey[index]=0; ZeWHSU  
    HotKeyMask[index]=0; TuIeaH%x  
    bRemoved=TRUE; kKE 2~ q  
    KeyCount--; j])iyn~-Ke  
    break; !SJmu}OB]  
   } cJ]`/YJ  
  }  t8GJ;  
 } HH^{,53%  
 return bRemoved; _?kf9.  
} Tj0eW(<!s  
Zu%_kpW  
2_r}4)z  
  DLL中的钩子函数如下: >ID 3oi  
6J%SkuxR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ih+kh7J-  
{ b4%IyJr  
 BOOL bProcessed=FALSE; Syp|s3u;  
 if(HC_ACTION==nCode) h^hEyrJw  
 { wk9tJ#}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 +Ya-h~7;g#  
   switch(wParam)  C&e  
   {  % Pa-fee  
    case VK_MENU: `9K'I-hv<8  
     MaskBits&=~ALTBIT; _tjFb_}Q  
     break; bL0+v@(r  
    case VK_CONTROL: DMf^>{[  
     MaskBits&=~CTRLBIT; d_5h6C z4  
     break; ~d{E>J77j  
    case VK_SHIFT: !\awT  
     MaskBits&=~SHIFTBIT; t"0~2R6i  
     break;  a$aI%  
    default: //judge the key and send message SI;G|uO;/  
     break; uT-WQ/id  
   } }a<MVG:>SF  
   for(int index=0;index<MAX_KEY;index++){ ,nHz~Xi1t  
    if(hCallWnd[index]==NULL) +nJ}+|@K  
     continue; G)<k5U4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \re.KB#R  
    { RtqW!ZZ:H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *D<sk7  
     bProcessed=TRUE; }FM<uBKW  
    } Ccc6 ko_  
   } N_gjOE`x5  
  } -3 W 4  
  else if((lParam&0xc000ffff)==1){ //有键按下 dk(-yv'  
   switch(wParam) PA5g]Tz  
   { ZgXh[UHQy  
    case VK_MENU: [dzb{M6_  
     MaskBits|=ALTBIT; 'HqAm$V+  
     break; klch!m=d  
    case VK_CONTROL: yv'rJI~ Ps  
     MaskBits|=CTRLBIT; wfZ 'T#1  
     break; H/, tE0ZV  
    case VK_SHIFT: zP9 HYS  
     MaskBits|=SHIFTBIT; a,j!B hu  
     break; Q'|cOQX  
    default: //judge the key and send message 4h~Oj y16&  
     break; (c} 0Sg  
   } ;3?M?E/$s  
   for(int index=0;index<MAX_KEY;index++){ yRgo1ow]  
    if(hCallWnd[index]==NULL) -8pHjry'q  
     continue; M?\)&2f[Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6u.b?_u  
    { be764do  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); & 9?vQq|%  
     bProcessed=TRUE; tNUcmiY  
    } J]~fv9~P  
   } 3oKqj>  
  } M,#t7~t  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }j:ae \(  
   for(int index=0;index<MAX_KEY;index++){ 92VAQU6  
    if(hCallWnd[index]==NULL) #dl8+  
     continue; zm~~mz A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J}YI-t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4]+ ^K`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 /f6]XP\'`+  
   } J%A`M\  
  } Wh<lmC50(  
 } H?~u%b@   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); siG?Sd_2  
} yNT2kB'  
JDhA{VN6  
  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: ^y3\e  
yf8UfB#a  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &6:,2W&s  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KW;xlJz(j  
JZtFt=>q  
  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: J`8>QMK^5  
'~f@p~P  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) o|}%pc3  
{ .ClCP?HG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) dyp] y$  
 { zbi  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 I{AU,  
  SaveBmp(); N Hh  
  return FALSE; lxmS.C  
 } "''<:K|  
 …… //其它处理及默认处理 ,G:4H%?  
} KGWENX_U  
m@Nx`aS?  
x2B"%3th0  
  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。 ChW0vIL`  
T7T!v  
  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。 (g)@wNBW  
'-S&i{H  
  二、编程步骤 [s34N+vU  
(p?3#|^  
  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"; ]dK]a:S  
d-<y'GYw  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; (XwLKkw0n  
0oJ^a^|  
  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; iy#OmI>j  
YJ^ lM\/<  
  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; h]MVFn{  
-5cH$]1\  
  5、 添加代码,编译运行程序。 cMWO_$  
qQcC[50  
三、程序代码 bZ9NnSuH  
F=om^6G%X5  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5Hm!5:ZB  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {^kG<v.vV  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ QO7:iSZJ  
#if _MSC_VER > 1000 by U\I5  
#pragma once iXm||?Rnx  
#endif // _MSC_VER > 1000 ^0|NmMJ]  
#ifndef __AFXWIN_H__ 7 h1"8#X  
#error include 'stdafx.h' before including this file for PCH uBTT {GGQ  
#endif U>+~.|'V9  
#include "resource.h" // main symbols N39nJqo>"  
class CHookApp : public CWinApp QP[a^5;Tt  
{ u,akEvH~a  
 public: U&n>fXTHn  
  CHookApp(); $048y X 7M  
  // Overrides KYu(H[a  
  // ClassWizard generated virtual function overrides Y+ Z9IiS7  
  //{{AFX_VIRTUAL(CHookApp) $ tNhwF  
 public: "k<:a2R  
  virtual BOOL InitInstance(); 1 (i>Vt.+  
  virtual int ExitInstance(); ]jb4Z  
  //}}AFX_VIRTUAL k2uiu  
  //{{AFX_MSG(CHookApp) U+"=  
  // NOTE - the ClassWizard will add and remove member functions here. `zp2;]W  
  // DO NOT EDIT what you see in these blocks of generated code ! MH.,s@  
  //}}AFX_MSG bX H^Bm  
  DECLARE_MESSAGE_MAP() 0#[f2X62B  
}; E)JyKm.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); i+[3o@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '= <`@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <gdgcvd  
BOOL InitHotkey(); b H?qijrC  
BOOL UnInit(); -z0{\=@#m  
#endif gc@#O#K~h^  
8KtgSash  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. :#[_Osmf(  
#include "stdafx.h" gww^?j#  
#include "hook.h" _qeuVi=A  
#include <windowsx.h> ij(4)=  
#ifdef _DEBUG HQ3`:l  
#define new DEBUG_NEW @7s,| \  
#undef THIS_FILE &U~r}=  
static char THIS_FILE[] = __FILE__; !Gp3/<"Wy$  
#endif _`_IUuj$E  
#define MAX_KEY 100 !e'0jf-~  
#define CTRLBIT 0x04 7vaN&%;E%  
#define ALTBIT 0x02 NceB'YG|  
#define SHIFTBIT 0x01 t/*K#]26  
#pragma data_seg("shareddata") 7+a%ehwU  
HHOOK hHook =NULL; {* j^g6;  
UINT nHookCount =0; "Wk{4gS7l  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey r^A#[-VyNP  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT = b<<5N s  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey N4H+_g|  
static int KeyCount =0; Yc82vSG'  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift WYC1rfd=  
#pragma data_seg() As+;qNO  
HINSTANCE hins; N 2"3~  #  
void VerifyWindow(); W/r mm*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) uR ;-eK  
//{{AFX_MSG_MAP(CHookApp) 48 CI8[T  
// NOTE - the ClassWizard will add and remove mapping macros here. 7p.h{F'A  
// DO NOT EDIT what you see in these blocks of generated code! Ok>(>K<r  
//}}AFX_MSG_MAP P$3=i`X!nw  
END_MESSAGE_MAP() VL7S7pb_  
 C5+`<  
CHookApp::CHookApp() So=nB} b[?  
{  oKYhE  
 // TODO: add construction code here, aw/7Z`   
 // Place all significant initialization in InitInstance @mx$sNDkL  
} \$'m ^tVU  
:5S |x/  
CHookApp theApp; x$n~f:1Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7<:Wq=e!r  
{ 3_MS'&M  
 BOOL bProcessed=FALSE; V[Rrst0yo  
 if(HC_ACTION==nCode) +lW}ixt  
 { adI!W-/R:  
  if((lParam&0xc0000000)==0xc0000000){// Key up $% Ci8p  
   switch(wParam) qo6LC>Qg  
   { 3kiE3*H  
    case VK_MENU: 9Yl8n dP^E  
     MaskBits&=~ALTBIT; /S]:dDY9K  
     break; [vWkAJ'K  
    case VK_CONTROL: `pi-zE)  
     MaskBits&=~CTRLBIT; t0bhXFaiE  
     break; abo>_"9-  
    case VK_SHIFT: ~`2&'8  
     MaskBits&=~SHIFTBIT; QtY hg$K3  
     break; b0YiQjS6>  
    default: //judge the key and send message nuSN)}b<Q  
     break; Ug7`ez4vw  
   } `z}vONXpAX  
   for(int index=0;index<MAX_KEY;index++){ * -KJh_  
    if(hCallWnd[index]==NULL) ypD<2z^  
     continue; z!s. 9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +9zJlL^A%  
    { VW9>xVd4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); UZje>. ~?  
     bProcessed=TRUE; DD!MGf/  
    } {N!E5*$Tr  
   } .Iw ur;/\  
  } .?rbny  
  else if((lParam&0xc000ffff)==1){ //Key down _ }E-~I>  
   switch(wParam) %j'G.*TD  
   { #2Pr Gz]  
    case VK_MENU: rGnI(m.  
     MaskBits|=ALTBIT; [1b6#I"x  
     break; =.36y9Mfo  
    case VK_CONTROL: _F`$ d2  
     MaskBits|=CTRLBIT; [ WV@w  
     break; +M'aWlPg,  
    case VK_SHIFT: .tRr?*V|l  
     MaskBits|=SHIFTBIT; Ot`LZ"H:  
     break; F qeV3 N  
    default: //judge the key and send message {f+N]Oo*  
     break; &8<<!#ob  
   } YDQ:eebg(  
   for(int index=0;index<MAX_KEY;index++) <<=e9Lh  
   { K(nS$x1G  
    if(hCallWnd[index]==NULL) C4QeDvpI  
     continue; >4n+PXRXX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zL:&Q<  
    { jR{-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Rx6l|'e  
     bProcessed=TRUE; TB7>s~)47E  
    } gq'>6vOj  
   } _wf5%(~b  
  } j G-  
  if(!bProcessed){ I|,pE**T  
   for(int index=0;index<MAX_KEY;index++){ Y5dD|]F|  
    if(hCallWnd[index]==NULL) ]} 61vV  
     continue; q$r&4s)To  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) sl/=g   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); z Yw;q3"  
   } %#~((m1  
  } n*4lz^LR  
 } oZTgN .q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4k8*E5cx  
} bIgh@= 2  
P$Z}  
BOOL InitHotkey() z]kwRWe`j  
{ Y3-gUX*w0  
 if(hHook!=NULL){ 25 CZmsg  
  nHookCount++; x_*%*H  
  return TRUE; ^SZw`]  
 } *~ p (GC  
 else !^m%O0DT  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); B:4Ka]{YO  
  if(hHook!=NULL) I @ 2uF-  
   nHookCount++; pO%{'%RA  
  return (hHook!=NULL); Ve{n<{P  
} C ye T]y  
BOOL UnInit() 4/S=5r}  
{ UMV)wy|j  
 if(nHookCount>1){ @;vNX*-J  
  nHookCount--; z{9=1XY  
  return TRUE; % Y~>Jl  
 } dsJm>U)  
 BOOL unhooked = UnhookWindowsHookEx(hHook); *LANGQ"2(i  
 if(unhooked==TRUE){ &59F8JgJ  
  nHookCount=0; .it#`Yz;  
  hHook=NULL; vCw<G6tD  
 } UuU/c-.  
 return unhooked; *?/tO, R?  
} BZK2$0  
.XXW|{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7R}9oK_I  
{ uG!:Z6%p  
 BOOL bAdded=FALSE; Wf#VA;d  
 for(int index=0;index<MAX_KEY;index++){ _;56^1'T  
  if(hCallWnd[index]==0){ $ a?  
   hCallWnd[index]=hWnd; e}'gvm  
   HotKey[index]=cKey; ohUdGO[/  
   HotKeyMask[index]=cMask; :ygWNK[ 6D  
   bAdded=TRUE; >ys[I0bo  
   KeyCount++; ! QM.P t7c  
   break; j~;;l!({i  
  } H~noJIw#  
 } OS-sk!  
 return bAdded; ^W~p..DF  
} &(EHq  
j[I`\"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b_TS<,  
{ jjRUL.  
 BOOL bRemoved=FALSE; pY@Y?Jj  
 for(int index=0;index<MAX_KEY;index++){ * z'8j  
  if(hCallWnd[index]==hWnd){ "wAf. =F  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ oH^(qZ8W  
    hCallWnd[index]=NULL; %Y]=1BRk}  
    HotKey[index]=0; (D<(6?  
    HotKeyMask[index]=0; =-NiO@5o  
    bRemoved=TRUE; :_5/u|{  
    KeyCount--; <3 TA>Dz  
    break; nd ink$  
   } F>zl9Vi<  
  } rYY$wA@  
 } LCs__.  
 return bRemoved; [U>@,BH  
} .Obn&S  
!M7<BD};  
void VerifyWindow() K_~h*Yc  
{ <[Q3rJ  
 for(int i=0;i<MAX_KEY;i++){ :IMdN}(L  
  if(hCallWnd!=NULL){ 1|{bDlmt  
   if(!IsWindow(hCallWnd)){ "5C`,4s  
    hCallWnd=NULL; 6sJw@Oa J  
    HotKey=0; ?^i1_v7 Bi  
    HotKeyMask=0; "T2"]u<52  
    KeyCount--; eujK4s  
   } =^&%9X  
  } hA}~es=c  
 } P?LlJ 5hn  
} %ft &Q  
eg/<[ A:  
BOOL CHookApp::InitInstance() ?YQPlv:<o.  
{ a,|?5j9,P  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?m7:if+ y  
 hins=AfxGetInstanceHandle(); ujFzJdp3k  
 InitHotkey(); s&a1y~rv  
 return CWinApp::InitInstance(); Aw5pd7qKL  
} a(IY\q[Wh  
*T`-|H*6@  
int CHookApp::ExitInstance() SJ?6{2^  
{ #>[a{<;Kn  
 VerifyWindow(); q5x[~]?  
 UnInit(); 5O <>mCF  
 return CWinApp::ExitInstance(); D}3T|N  
} {2&m`D bm  
JIm4vS  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file T!RT<&  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1PH: \0}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g7\,{Bw#E  
#if _MSC_VER > 1000 `'I{U5;e  
#pragma once ]:(W_ qEA  
#endif // _MSC_VER > 1000 omSM:f_~  
"{D6J809  
class CCaptureDlg : public CDialog |4(~%| 8{  
{ NTo!'p:s  
 // Construction vb Y3;+M>  
 public:  6e,xDr  
  BOOL bTray; .IarkeCtb  
  BOOL bRegistered; 7O5`v(<9n>  
  BOOL RegisterHotkey(); asJ!NvVG'  
  UCHAR cKey; '1?\/,em  
  UCHAR cMask; |re}6#TgcT  
  void DeleteIcon(); 2P#=a?~[  
  void AddIcon(); #KxbM-1=  
  UINT nCount; n">u mM;Eh  
  void SaveBmp(); n DS}^Ba  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^y!;xc$(Qs  
  // Dialog Data (*p , T  
  //{{AFX_DATA(CCaptureDlg) ]rehW}  
  enum { IDD = IDD_CAPTURE_DIALOG }; sRSz}]  
  CComboBox m_Key; o*WY=  
  BOOL m_bControl; dCyqvg6u  
  BOOL m_bAlt; (8$k4`T>  
  BOOL m_bShift; 1MlUG5  
  CString m_Path; #Z+i~t{e(  
  CString m_Number; <"N_j]wD  
  //}}AFX_DATA vhbDb)J  
  // ClassWizard generated virtual function overrides O.aG[ wm8  
  //{{AFX_VIRTUAL(CCaptureDlg) cH' iA.  
 public: Q?b14]6im  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Fm\"{)V:b  
 protected: in+}/mwfC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x8Loyt_C  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); {S/yL[S.  
  //}}AFX_VIRTUAL 6!x&LoM  
  // Implementation vo>d!rVCV  
 protected: `?T#Hl>j  
  HICON m_hIcon; @ "a6fn  
  // Generated message map functions 1 `^Rdi0  
  //{{AFX_MSG(CCaptureDlg) ]aP= Ks%  
  virtual BOOL OnInitDialog(); :x.7vZzxs  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "Z Htr<+  
  afx_msg void OnPaint(); :y*NM,s  
  afx_msg HCURSOR OnQueryDragIcon(); m>USD? i  
  virtual void OnCancel(); w(ln5q  
  afx_msg void OnAbout(); <q*oV  
  afx_msg void OnBrowse(); ,}oM-B  
  afx_msg void OnChange(); qm/Q65>E  
 //}}AFX_MSG :NJ_n6E  
 DECLARE_MESSAGE_MAP() pl@O N"=[  
}; 2M#M"LHo  
#endif Q!- 0xlx  
P-F)%T[  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W} WI; cI  
#include "stdafx.h" A.<H>=Z# O  
#include "Capture.h" H]Hv;fcC  
#include "CaptureDlg.h" fjvN$NgVs  
#include <windowsx.h> \(226^|j  
#pragma comment(lib,"hook.lib") 8fA_p}wp  
#ifdef _DEBUG mxor1P#|  
#define new DEBUG_NEW !It`+0S b  
#undef THIS_FILE R_M?dEtE>  
static char THIS_FILE[] = __FILE__; ^` un'5Vk  
#endif S$KFf=0  
#define IDM_SHELL WM_USER+1 XE^)VLH:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  _zlqtO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zvABU+{jD  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; BA\/YW @  
class CAboutDlg : public CDialog `:N# 'i  
{ .MO\uh0N  
 public: " \I4u{zC  
  CAboutDlg();  "KcA  
  // Dialog Data n>@oBG)!  
  //{{AFX_DATA(CAboutDlg) W3`>8v1?o  
  enum { IDD = IDD_ABOUTBOX }; pv| Pm  
  //}}AFX_DATA R$;n)_H  
  // ClassWizard generated virtual function overrides y#}cC+;   
  //{{AFX_VIRTUAL(CAboutDlg) [MuEoWrq(}  
 protected: t78k4?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I*9e]m"  
  //}}AFX_VIRTUAL x.Q&$#  
  // Implementation vJAZ%aW  
 protected: !9 fz(9  
  //{{AFX_MSG(CAboutDlg) Gt9&)/#  
  //}}AFX_MSG IV\J3N^  
  DECLARE_MESSAGE_MAP() 2WUT/{:X  
}; Uj&W<'I  
xsWur(>]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \*=7#Vd  
{ 'SQG>F Uy  
 //{{AFX_DATA_INIT(CAboutDlg) ,{\Bze1fn  
 //}}AFX_DATA_INIT 2]%h$f+  
} !i=nSqW  
[M+f-kl  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) aF03a-qw<  
{ cuOvN"nuNj  
 CDialog::DoDataExchange(pDX); %Uz(Vd#K  
 //{{AFX_DATA_MAP(CAboutDlg) bn |zl!Pq  
 //}}AFX_DATA_MAP oK 6(HF'&  
} f/CuE%7BR  
4CGPO c  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^eW}XRI  
 //{{AFX_MSG_MAP(CAboutDlg) J\ e+}{  
 // No message handlers $9?cP`hmi  
 //}}AFX_MSG_MAP 5`f@>r?  
END_MESSAGE_MAP() &89 oO@5  
0uBl>A7qhn  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wEzKqD  
: CDialog(CCaptureDlg::IDD, pParent) `xrmT t X  
{ 5dZ|!  
 //{{AFX_DATA_INIT(CCaptureDlg) 1sYEZO;  
  m_bControl = FALSE; m3o,@=b  
  m_bAlt = FALSE; O%r;5kP  
  m_bShift = FALSE; @)SL_9  
  m_Path = _T("c:\\"); zt^48~ry  
  m_Number = _T("0 picture captured."); ~|<m,)!  
  nCount=0; .*elggM  
  bRegistered=FALSE; 2h?uNW(0Q  
  bTray=FALSE; mrX^2SR  
 //}}AFX_DATA_INIT EbqcV\Kb  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ayAo^q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >}(CEzc8  
} J,b&XD@m  
x W92ch+t  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Wb S4pdA  
{ >[X{LI(_<<  
 CDialog::DoDataExchange(pDX); mFHH515  
 //{{AFX_DATA_MAP(CCaptureDlg) `5H$IP1XhA  
  DDX_Control(pDX, IDC_KEY, m_Key); `"%T=w  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *OQG 4aWy  
  DDX_Check(pDX, IDC_ALT, m_bAlt); OgX6'E\E  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); xLx]_R()  
  DDX_Text(pDX, IDC_PATH, m_Path); ([xo9FP;  
  DDX_Text(pDX, IDC_NUMBER, m_Number); u ElAnrm  
 //}}AFX_DATA_MAP '= l[;Q^Q  
} < })'Y~i  
7 [g/TB  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) P6MRd/y |  
//{{AFX_MSG_MAP(CCaptureDlg) .L~Nq%g1  
 ON_WM_SYSCOMMAND() j2 !3rI  
 ON_WM_PAINT() cV`E>w=D0  
 ON_WM_QUERYDRAGICON() RQMEBsI}  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) - M,7N}z@;  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2.d|G `  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Xt#1Qs  
//}}AFX_MSG_MAP 5O`dO9g}$  
END_MESSAGE_MAP() Hk|0HL  
$-On~u0g  
BOOL CCaptureDlg::OnInitDialog() F]9nB3:W  
{ NH0qVQ@A  
 CDialog::OnInitDialog(); Yq/.-4 y  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);  YBnA+l*  
 ASSERT(IDM_ABOUTBOX < 0xF000); itzyCw2|#  
 CMenu* pSysMenu = GetSystemMenu(FALSE); <7Ae-!>x  
 if (pSysMenu != NULL) IJ/sX_k  
 { e${)w-R/e  
  CString strAboutMenu; }W ^: cp  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~b:Rd{  
  if (!strAboutMenu.IsEmpty()) T 6~_Q}6  
  { T7f ${  
   pSysMenu->AppendMenu(MF_SEPARATOR); H OBP`lf  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?-Vjha@BO  
  } w4fW<ISg  
 } ~@kU3ZGJZ  
 SetIcon(m_hIcon, TRUE); // Set big icon ++DG5`  
 SetIcon(m_hIcon, FALSE); // Set small icon mXXt'_"  
 m_Key.SetCurSel(0); c5mZG7-  
 RegisterHotkey(); cm[c ze+*  
 CMenu* pMenu=GetSystemMenu(FALSE); &hk-1y9QS  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <r3J0)r}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *s;|T?~i  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); T\r@5Xv  
 return TRUE; // return TRUE unless you set the focus to a control pD&& l!i&[  
} `~cuQ<3Tn  
Y \:0Ev  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) bb d.  
{ a/< Csad  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Vi$-Bw$@  
 { pBw0"ff  
  CAboutDlg dlgAbout; S~Id5T:,  
  dlgAbout.DoModal(); lvp8z) G  
 } =V^.}WtO  
 else BT@r!>Nl  
 { #:d =)Qj0  
  CDialog::OnSysCommand(nID, lParam); r$wxk 4%Rz  
 } ~gu3g^<0v  
} TB;o~>9U  
0VK-g}"x  
void CCaptureDlg::OnPaint() 'fL"txW  
{ 5MSB dO  
 if (IsIconic()) ce6__f 5?  
 { C R|lt  
  CPaintDC dc(this); // device context for painting ,$eK-w  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); PoIl>c1MS  
  // Center icon in client rectangle z(\4 M==2O  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7w1wr)qSB  
  int cyIcon = GetSystemMetrics(SM_CYICON); nW|wY.  
  CRect rect; cr;g5C V  
  GetClientRect(&rect); )3(;tT,$}^  
  int x = (rect.Width() - cxIcon + 1) / 2; #M!!CX*k  
  int y = (rect.Height() - cyIcon + 1) / 2; Iz[@^IUx=  
  // Draw the icon jM:Y' l]  
  dc.DrawIcon(x, y, m_hIcon); 1 n%?l[o  
 } b]a@  
 else "U \JV)N  
 { p^iRPI  
  CDialog::OnPaint(); RQFI'@Ks  
 } +<prgP`v  
} ;us%/kOR  
",)Qc!^P$  
HCURSOR CCaptureDlg::OnQueryDragIcon() aTzjm`F0  
{ !cGDy/ |  
 return (HCURSOR) m_hIcon; smm]6  
} ;@ [ 0x  
ltFq/M  
void CCaptureDlg::OnCancel() S(mF%WJ  
{ mR;qMX)0h  
 if(bTray) @zgdq  
  DeleteIcon(); 0 u?{ \  
  CDialog::OnCancel(); vF?5].T  
} [ 4;Ii  
qp}Ma8+  
void CCaptureDlg::OnAbout() *|_"W+JC  
{ Z/ Tm)Xd  
 CAboutDlg dlg; #Oha(mRY  
 dlg.DoModal(); 6; Y0a4Ax  
} we#wH-  
-n0C4kZ2o  
void CCaptureDlg::OnBrowse() f7I{WfZ\P  
{ 5E0eyW  
 CString str; 4^<6r*  
 BROWSEINFO bi; %_UN<a  
 char name[MAX_PATH]; c/ 5W4_J  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); xm6EKp:  
 bi.hwndOwner=GetSafeHwnd(); F} d  
 bi.pszDisplayName=name; QORN9SY  
 bi.lpszTitle="Select folder"; r_YIpnJ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7#<c>~   
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); eyp,y2Tz  
 if(idl==NULL) *. &HD6Qr  
  return; VtOZ%h[#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^2wLxXO6  
 str.ReleaseBuffer(); VxzkQ}o  
 m_Path=str; 6'W[{gzl  
 if(str.GetAt(str.GetLength()-1)!='\\') -TZ p FT"  
  m_Path+="\\";  KQ[!o!%  
 UpdateData(FALSE); =H<0o?8?c  
} JCY~W=;v  
 8L*GE  
void CCaptureDlg::SaveBmp() 8J)xzp`*)  
{ VxFOYC>p  
 CDC dc; $F.kK%-*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); i!~'M;S  
 CBitmap bm; `Bn=?9  
 int Width=GetSystemMetrics(SM_CXSCREEN); ,^8MB.  
 int Height=GetSystemMetrics(SM_CYSCREEN); NU (AEfF  
 bm.CreateCompatibleBitmap(&dc,Width,Height); MuBx#M/  
 CDC tdc; ouHu8)q'r  
 tdc.CreateCompatibleDC(&dc); _73h<|0  
 CBitmap*pOld=tdc.SelectObject(&bm); `c+/q2M  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Y qcD-K  
 tdc.SelectObject(pOld); eh R{X7J  
 BITMAP btm; A>VX*xd  
 bm.GetBitmap(&btm); .qob_dRA  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; d1joVUYE  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #Dfo#]k(  
 BITMAPINFOHEADER bih; _8G>&K3T<  
 bih.biBitCount=btm.bmBitsPixel; g+PPW88P;  
 bih.biClrImportant=0; TEsnNi 1  
 bih.biClrUsed=0; U1_&gy @y  
 bih.biCompression=0; 6x=YQwn~  
 bih.biHeight=btm.bmHeight; a,7 &"  
 bih.biPlanes=1; @/UfD ye  
 bih.biSize=sizeof(BITMAPINFOHEADER); [\R>Xcu>  
 bih.biSizeImage=size; vVT?h  
 bih.biWidth=btm.bmWidth; AnZclqtb  
 bih.biXPelsPerMeter=0; V,EF'-F  
 bih.biYPelsPerMeter=0; YRlDX:oX~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Lhh;2r/?78  
 static int filecount=0; (cv!Y=]  
 CString name; O3V.^_k;  
 name.Format("pict%04d.bmp",filecount++); >"3>fche  
 name=m_Path+name; *5,c Rz  
 BITMAPFILEHEADER bfh; sCl$f7"  
 bfh.bfReserved1=bfh.bfReserved2=0; ~:_0CKa!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5.tvB  
 bfh.bfSize=54+size; Tp<k<uKD  
 bfh.bfOffBits=54; bzi|s5!'<  
 CFile bf; pUl8{YGS  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;7Oi!BC  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); X5g[ :QKP7  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p4VSm a_(  
  bf.WriteHuge(lpData,size); PNSMcakD  
  bf.Close(); Eaad,VBtU  
  nCount++; Ml>( tec  
 } (Y(E%  
 GlobalFreePtr(lpData); @;wzsh >o  
 if(nCount==1) dV8iwI  
  m_Number.Format("%d picture captured.",nCount); p$;I'  
 else FbACTeB  
  m_Number.Format("%d pictures captured.",nCount); }jF+`!*!  
  UpdateData(FALSE); 6ri\>QrF  
} *@V*~^V"J[  
VSOz.g>  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) vuz4qCQ  
{ 1@XgTL4  
 if(pMsg -> message == WM_KEYDOWN) z2/!m[U  
 { "Mmf6hu  
  if(pMsg -> wParam == VK_ESCAPE) =7 ,Kf} 6  
   return TRUE; wHsB,2H  
  if(pMsg -> wParam == VK_RETURN) u~Tg&0V30  
   return TRUE; 9h(IUD{8  
 } #f'DEo<b  
 return CDialog::PreTranslateMessage(pMsg); o07IcIo  
} e,A)U5X  
Ul Mi.;/^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /48 =UK  
{ b4,jN~ci  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ bdh(WJh%  
  SaveBmp(); 6-,m}Ce\  
  return FALSE; PI5j"u UO  
} @{Py%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3]E(mRX  
 CMenu pop; xk~Nmb}  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); <M[U#Q~?~e  
 CMenu*pMenu=pop.GetSubMenu(0); $M"0BZQ?y!  
 pMenu->SetDefaultItem(ID_EXITICON); cQpnEO&SL  
 CPoint pt; G@d`F  
 GetCursorPos(&pt); . gZZCf&?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); N b3$4(F  
 if(id==ID_EXITICON) & 7QH^  
  DeleteIcon(); 8V4V3^_xs  
 else if(id==ID_EXIT) /c+)C"  
  OnCancel(); nb dGt  
 return FALSE; EH`0  
} UCqs}U8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Gg0#H^s( (  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) HW7FP]NH  
 AddIcon(); :Eh'(   
 return res; F'J [y"~_  
} n+2J Dq|?p  
{w`:KR6o7  
void CCaptureDlg::AddIcon() [ug,jEH"S  
{ nJ3vi}`  
 NOTIFYICONDATA data; OKwOugi0  
 data.cbSize=sizeof(NOTIFYICONDATA); 0|)19LR  
 CString tip; oJaAM|7uv  
 tip.LoadString(IDS_ICONTIP); V"d=.Hb>  
 data.hIcon=GetIcon(0); Pl~P-n  
 data.hWnd=GetSafeHwnd(); Gm=>!.p  
 strcpy(data.szTip,tip); ^>r^3C)_-  
 data.uCallbackMessage=IDM_SHELL; /3^P_\,>f  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; xNdIDj@  
 data.uID=98; , &' Y  
 Shell_NotifyIcon(NIM_ADD,&data); -a) T6:e  
 ShowWindow(SW_HIDE); `"y{;PCt_  
 bTray=TRUE; >BqCkyM9Kf  
} ~-Oa8ww  
)}X5u%woV  
void CCaptureDlg::DeleteIcon() S6 }QFx  
{ =hX[  
 NOTIFYICONDATA data; Z6=~1'<X  
 data.cbSize=sizeof(NOTIFYICONDATA); &`:rp!Lc  
 data.hWnd=GetSafeHwnd(); ~y\:iL//E  
 data.uID=98; +*EKR  
 Shell_NotifyIcon(NIM_DELETE,&data); U|fTb0fB  
 ShowWindow(SW_SHOW); z<a2cQ?XQ  
 SetForegroundWindow(); ! sYf<  
 ShowWindow(SW_SHOWNORMAL); #w~0uCzQ@  
 bTray=FALSE; B7 "Fp  
} ,8 SWe  
?ei%RWo  
void CCaptureDlg::OnChange() XNmQ?`.2'  
{ _p4}<pG  
 RegisterHotkey(); 8j\d~Lw=  
} g{DFS[h  
ujx-jIhT_  
BOOL CCaptureDlg::RegisterHotkey() lIDl1Z@Z  
{ QN 0rE @a  
 UpdateData(); `Wf5  
 UCHAR mask=0; $Qq_qTJu?G  
 UCHAR key=0; 29O]S8  
 if(m_bControl) FP;": iRL  
  mask|=4; Yk>8g;<  
 if(m_bAlt) {,V$*  
  mask|=2; @P70W<<  
 if(m_bShift) OJ[rj`wrW^  
  mask|=1; c/$*%J<  
  key=Key_Table[m_Key.GetCurSel()]; +sn2Lw!^  
 if(bRegistered){ <:cpz* G4  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6D*chvNA;  
  bRegistered=FALSE; L[]^{ O   
 } a @SUi~+3  
 cMask=mask; 2NR7V*A  
 cKey=key; =K6c;  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ta! V=U  
 return bRegistered; <P pYl  
} "#XtDpGk  
y"R("j $  
  四、小结 ?cBO6^  
g5TkD~w"  
  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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