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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: Z R/#V7Pj  
  z~`b\A,$  
  一、实现方法 \]$IDt(s  
}!IL]0 q  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ( Jz;W<E  
#9K-7je;j  
#pragma data_seg("shareddata") &gzCteS  
HHOOK hHook =NULL; //钩子句柄 RV@*c4KvO+  
UINT nHookCount =0; //挂接的程序数目 [JF150zr  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 mZd , 9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ,#pXpAz/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey kbM3  
static int KeyCount =0; /0Ax*919j  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 jH_JmYd  
#pragma data_seg() pb~pN  
/7gOSwY  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 r Tz$^a}/  
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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: B(M6@1m_  
h: 9Zt0,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR n=[/Z!  
cKey,UCHAR cMask) e=.]F*:J  
{ ~?(N  
 BOOL bAdded=FALSE; D-c`FG'  
 for(int index=0;index<MAX_KEY;index++){ EY tQw(!Q  
  if(hCallWnd[index]==0){ E~6c-Lw  
   hCallWnd[index]=hWnd; >p"c>V& 8  
   HotKey[index]=cKey; <_7*67{  
   HotKeyMask[index]=cMask; aTt 12Sc  
   bAdded=TRUE; wp&=$Aa)'  
   KeyCount++; j:VbrR  
   break; AB4(+S*LA  
  } fZoHf\B]{  
 } O&Y*pOg  
 return bAdded; <[-nF"Q  
} 4q k9NK2 U  
//删除热键 <*qnY7c&N;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &wV]"&-  
{ Q637N|01  
 BOOL bRemoved=FALSE; adR)Uq9  
 for(int index=0;index<MAX_KEY;index++){ _WRFsDZ'  
  if(hCallWnd[index]==hWnd){ \pVXimam  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ z*!%g[3I  
    hCallWnd[index]=NULL; V{!J-nO  
    HotKey[index]=0; e7sp =I ,  
    HotKeyMask[index]=0; ax<?GjpM  
    bRemoved=TRUE; +8RgF   
    KeyCount--; Hhcpp7cr'  
    break; fSokm4]vg  
   } ,Pdf,2  
  } s*-n^o-  
 } fR(d  
 return bRemoved; NeE t  
} U`2e{>'4t  
UdpF@Q  
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  DLL中的钩子函数如下: =\H!GT  
E2Q[ZoVS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (pv+c,  
{ $\X[@E S0  
 BOOL bProcessed=FALSE; ~T1 XLu  
 if(HC_ACTION==nCode) Z$/xy"  
 { JzQ)jdvp  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 t.xxSU5~%  
   switch(wParam) X:vghOt?  
   {  B><d9d  
    case VK_MENU: ;V*l.gr'2  
     MaskBits&=~ALTBIT; _./Sk|C  
     break; ~a ]+#D  
    case VK_CONTROL: CxwoBuG=?  
     MaskBits&=~CTRLBIT; Vf] "L .G  
     break; PHZ0P7  
    case VK_SHIFT: onz?_SAW  
     MaskBits&=~SHIFTBIT; JB<Sl4  
     break; 1_PoqD!q  
    default: //judge the key and send message O$_)G\\\m  
     break; _`&m\Qe>  
   } -zOdU}91Ao  
   for(int index=0;index<MAX_KEY;index++){ :~Wrf8 UQ  
    if(hCallWnd[index]==NULL) TQpfQ  
     continue; }dgfqq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) haK3?A,"_A  
    { >=:&D)m"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _>(^tCo  
     bProcessed=TRUE; d3 ZdB4L  
    } {.C!i{|  
   } 42G)~lun-d  
  } WrQDX3  
  else if((lParam&0xc000ffff)==1){ //有键按下 + B B@OW  
   switch(wParam) .HS"}A T  
   { m% -g~q  
    case VK_MENU: >3_jWFq  
     MaskBits|=ALTBIT; ObVGV  
     break; [uC ]*G]  
    case VK_CONTROL: 2@'oe7E  
     MaskBits|=CTRLBIT; n.!#P|  
     break; _aGOb;h  
    case VK_SHIFT: Ugu[|,  
     MaskBits|=SHIFTBIT; vK|E>nL  
     break; x$5) ^ud?  
    default: //judge the key and send message :W!7mna  
     break; \?[v{WP)  
   } qE&v ;  
   for(int index=0;index<MAX_KEY;index++){ S?1AFI9{   
    if(hCallWnd[index]==NULL) .7e2YI,S  
     continue; Aw$x;3y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !=;+%C&8y  
    { `q}I"iS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); & ?h#Z!  
     bProcessed=TRUE; 7Ri46Tkt  
    } TSTl+W  
   } wvO|UP H\  
  } ^U `[(kz=  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 R.jIl@p   
   for(int index=0;index<MAX_KEY;index++){ R Q vft  
    if(hCallWnd[index]==NULL) (D#B_`;-  
     continue; HW3 }uP\c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) H$=e -L`@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); K&POyOvT  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 wQqb`l7+  
   } .L9j>iP9 *  
  } z.7cy@N6  
 } S^-DK~Xt4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K-bD<X  
} F"&~*m^+  
f,h J~  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: K(q+ "  
;YA(|h<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +c(zo4nZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E(O74/2c8  
vI:;A/&  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: .z]Wyx&/U  
Huy5-[)15  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UJD 0K]s  
{ `z{%(_+[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4" Cb/y3  
 { ock Te5U  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 wN@oYFoL  
  SaveBmp(); kE:nsXI )  
  return FALSE; QqFR\6  
 } #*QO3y~ZM  
 …… //其它处理及默认处理 {_7 i8c<s=  
} &ib5* 4!  
*!q1Kr6r  
0 t Fkd  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 8K.R=  
1;C+$  
  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。 SQ44  
n,jKmA  
  二、编程步骤 F20E_2;@@  
*AG#316  
  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"; h}*/Ge]aM  
;|p BFKx  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <vUbv   
RTE8Uq36  
  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; 6ys &zy  
Fpm|_f7  
  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; N/Z2hn/m  
Ir {OheJ  
  5、 添加代码,编译运行程序。 ]^Qn  
lt ^GvWg  
三、程序代码 9{(.Il J>  
mR&H9 NG  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL z2MWN\?8  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ?\vh9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ '9S8}q  
#if _MSC_VER > 1000 Z)! qW?  
#pragma once >64P6P;S  
#endif // _MSC_VER > 1000 wj,:"ESb4  
#ifndef __AFXWIN_H__ )CuZDf@  
#error include 'stdafx.h' before including this file for PCH =-8bsV/l  
#endif S'4(0j  
#include "resource.h" // main symbols V#XppYU  
class CHookApp : public CWinApp XiL~TCkx4  
{ `V`lo,"\  
 public: ;%<,IdhN  
  CHookApp(); O_ChxX0KP  
  // Overrides )+[ gd/<C.  
  // ClassWizard generated virtual function overrides L\@I*QP  
  //{{AFX_VIRTUAL(CHookApp) d{SG Cr 9d  
 public: fDT%!  
  virtual BOOL InitInstance(); pm_`>3  
  virtual int ExitInstance(); yKa{08X:  
  //}}AFX_VIRTUAL *VFf.aPwYi  
  //{{AFX_MSG(CHookApp) EK;YiJ  
  // NOTE - the ClassWizard will add and remove member functions here. YE|SKx@  
  // DO NOT EDIT what you see in these blocks of generated code ! bmfI~8  
  //}}AFX_MSG Fh`~`eog  
  DECLARE_MESSAGE_MAP() ZZHDp&lh}  
}; A/u)# ^\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); np8gKV D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @)|C/oA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^Pbk#|$rU  
BOOL InitHotkey(); Y8m1M-#w  
BOOL UnInit(); d/[; `ZD+  
#endif :c8&N-`  
aMtsmL?=  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. .}OR  
#include "stdafx.h" ,q}ML TS i  
#include "hook.h" M%ICdIc'  
#include <windowsx.h> w8MG(Lq1"  
#ifdef _DEBUG I aGq]z  
#define new DEBUG_NEW Lv| q  
#undef THIS_FILE 3~uW I%I`  
static char THIS_FILE[] = __FILE__; [H6hyG~  
#endif %Z):>'  
#define MAX_KEY 100 /H8g(  
#define CTRLBIT 0x04 5*Y^\N  
#define ALTBIT 0x02 SKkUU^\#R`  
#define SHIFTBIT 0x01 -_1>C\h"  
#pragma data_seg("shareddata") KwPOO{4]g  
HHOOK hHook =NULL; 1JztFix  
UINT nHookCount =0; ^; )8VP6  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey f33l$pOp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT {]%0lf:  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey "Y~:|?(@-  
static int KeyCount =0; (C@mLu)  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift n=y[CKS  
#pragma data_seg() !bN*\c  
HINSTANCE hins; v":x4!kdX  
void VerifyWindow(); VXR>]HUF  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) B56L1^ 7  
//{{AFX_MSG_MAP(CHookApp) ]sE?ezu  
// NOTE - the ClassWizard will add and remove mapping macros here. 6)Y.7XR  
// DO NOT EDIT what you see in these blocks of generated code! OmIg<v 0\;  
//}}AFX_MSG_MAP Y8-86 *zC  
END_MESSAGE_MAP() FaDjLo2'o  
nV-mPyfL8  
CHookApp::CHookApp() :lf+W  
{ ? 4q4J8j  
 // TODO: add construction code here, @d mV  
 // Place all significant initialization in InitInstance ^j31S*f&:  
} G 8g<>d{j  
gm igsXQ  
CHookApp theApp; 19E 8'@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ykV 5  
{ |mGFts}0o'  
 BOOL bProcessed=FALSE; +n{#V;J  
 if(HC_ACTION==nCode) W-?()dX{  
 { i3 6eBjT  
  if((lParam&0xc0000000)==0xc0000000){// Key up _kU:Z  
   switch(wParam) &jslyQ#  
   { @?yX!_YC  
    case VK_MENU: G9xmmc  
     MaskBits&=~ALTBIT; eZIhEOF  
     break; * +"9%&?  
    case VK_CONTROL: WtG~('g>&  
     MaskBits&=~CTRLBIT; =cm~vDl[  
     break; El.hu%#n*G  
    case VK_SHIFT: |wiqGzAr{  
     MaskBits&=~SHIFTBIT; 8FKXSqhVM  
     break; q7_ m&-0)  
    default: //judge the key and send message $~VRza 8Q  
     break; pTPi@SBaP{  
   } 5ni~Q 9b  
   for(int index=0;index<MAX_KEY;index++){ y\Ic@-aWI  
    if(hCallWnd[index]==NULL) .1KhBgy^K  
     continue; Z4S!NDMm~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YwDbPX  
    { U+:m4a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); xJ>fm%{5  
     bProcessed=TRUE;  gQ'zW  
    } fGUE<l  
   } wy0tgy(' |  
  } 8u6:=fxb  
  else if((lParam&0xc000ffff)==1){ //Key down x3 q]I8q  
   switch(wParam) D8Ykg >B;&  
   { :Av#j@#  
    case VK_MENU: _jLL_GD  
     MaskBits|=ALTBIT; w80oXXs[#  
     break; e+~\+:[?  
    case VK_CONTROL: . $BUw  
     MaskBits|=CTRLBIT; \fG#7_wt  
     break; $*e2YQdLo  
    case VK_SHIFT: p1Jh0o8  
     MaskBits|=SHIFTBIT; ad*m%9Y1Q  
     break; j(m.$:  
    default: //judge the key and send message A#.edVj.g4  
     break; c~z82iXNO  
   } OGK}EI  
   for(int index=0;index<MAX_KEY;index++) llcb~  
   { ,}3 'I [  
    if(hCallWnd[index]==NULL) KN<S}3MN  
     continue; (;T^8mI2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jrr EAp  
    { d,+Hd2o^X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #|L8tuWW  
     bProcessed=TRUE; U' H$`$Ov  
    } ?9e_gV{&;  
   } t| g4m[kr  
  } +"rDT1^V  
  if(!bProcessed){ 8I lunJ  
   for(int index=0;index<MAX_KEY;index++){ ~xkeuU  
    if(hCallWnd[index]==NULL) e>6y%v;  
     continue; ^uKwB;@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wxKX{Bs  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mk;&yh  
   } 00(on28b  
  } [4YTDEv%  
 } 3eb%OEMYk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); s2h@~y  
} sd*p/Q|4  
(/=f6^}  
BOOL InitHotkey() i+A3~w5c  
{ `#rL*;\uV  
 if(hHook!=NULL){ um jt]Gu[  
  nHookCount++; "sS}N%!  
  return TRUE; ). <-X^@  
 } 6/5YjO|a  
 else p2#)A"  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ?^7t'`zk  
  if(hHook!=NULL) `.E[}W  
   nHookCount++; I@T8Iv=  
  return (hHook!=NULL); F}F&T  
} Y1OCLnK~  
BOOL UnInit() G? ])o5  
{ [A~y%bI"  
 if(nHookCount>1){ P@Hs`=  
  nHookCount--; DVG(V w  
  return TRUE; #*D)Q/k  
 } &q3"g*q  
 BOOL unhooked = UnhookWindowsHookEx(hHook); O9G[j=U  
 if(unhooked==TRUE){ ynq}76 H0k  
  nHookCount=0; xe]y]  
  hHook=NULL; ohRjvJ'v|  
 } vq0Vq(V=  
 return unhooked; r)lEofX,g+  
} 'H3^e}   
3_ r*y9l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v_<rNc,z-s  
{ ?iw!OoZ`  
 BOOL bAdded=FALSE; !<j'Ea  
 for(int index=0;index<MAX_KEY;index++){ \9cbI3rGz  
  if(hCallWnd[index]==0){ IshKH -  
   hCallWnd[index]=hWnd; Vp#JS3Y  
   HotKey[index]=cKey; 69PE9zz  
   HotKeyMask[index]=cMask; A0/"&Ag]  
   bAdded=TRUE; -?H#LUk  
   KeyCount++; 44gPCW,u  
   break; 6w*dKInG[-  
  } SOs:]U-T3  
 } EOIN^4V"  
 return bAdded; |v`AA?@{8  
} fX(3H1$"  
_64A( U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) O_2pIbh  
{ bENdMH";  
 BOOL bRemoved=FALSE; Ye\rB\-  
 for(int index=0;index<MAX_KEY;index++){ o@r7 n>G  
  if(hCallWnd[index]==hWnd){ &c`nR<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ XR8,Vt)=  
    hCallWnd[index]=NULL; Gk. ruQW"  
    HotKey[index]=0; J; 3{3  
    HotKeyMask[index]=0; &x=.$76  
    bRemoved=TRUE;  j?A/#  
    KeyCount--; zbXI%  
    break; |Z|-q"Rf  
   } dWM'fg  
  } ZEXc%-M  
 } i#&z2h-b  
 return bRemoved; o906/5M  
} O#n8=B4  
q VjdOY:z  
void VerifyWindow() +cD<:"L'g  
{ aFc1|.Nm  
 for(int i=0;i<MAX_KEY;i++){ <vnHz?71c  
  if(hCallWnd!=NULL){ \(J8#V  
   if(!IsWindow(hCallWnd)){ }wWKFX  
    hCallWnd=NULL; 6~0$Z-);(  
    HotKey=0; j>*S5y.{  
    HotKeyMask=0; 8J*"%C$qe  
    KeyCount--; pe0F0Ruy  
   } CWf / H)~  
  } \@-@Y  
 } ZWii)0'PV  
} b[__1E9v'  
NWP5If|'X  
BOOL CHookApp::InitInstance() +y,T4^{  
{ JHW "-b  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); S_iMVHe  
 hins=AfxGetInstanceHandle(); ,f kcp]}  
 InitHotkey(); BmBj7  
 return CWinApp::InitInstance(); 'QG xd!4  
} kHk px52  
g(nPQOs$u  
int CHookApp::ExitInstance() Q0$8j-1I  
{ +QB"8-  
 VerifyWindow(); ,V'o4]H  
 UnInit(); Q.bXM?V)  
 return CWinApp::ExitInstance(); ImCe K  
} !y#"l$"xK  
2;xIL]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file h}-3\8 >  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .\ K_@M  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ K*\' .~[6  
#if _MSC_VER > 1000 w;D+y*2  
#pragma once ?8HHA: GP  
#endif // _MSC_VER > 1000 bf0+DvIB  
U T>s 5C  
class CCaptureDlg : public CDialog H!vax)%-\  
{ $v,dz_O*\  
 // Construction &vHoRY  
 public: X$%'  
  BOOL bTray; P<oehw'>  
  BOOL bRegistered; kSC}aN'  
  BOOL RegisterHotkey(); ,?PTcQF  
  UCHAR cKey; :s=NUw_^  
  UCHAR cMask; U2$d%8G  
  void DeleteIcon(); c_\YBe]wJ  
  void AddIcon(); M=.:,wRm  
  UINT nCount; ;sfb 4x4  
  void SaveBmp(); >d~WH@o`G  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ( W a  
  // Dialog Data *?o{9v5}(  
  //{{AFX_DATA(CCaptureDlg) Q)"C&) `l  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0WT{,/>  
  CComboBox m_Key; Yj%U >),8  
  BOOL m_bControl; 0fc/wfv <  
  BOOL m_bAlt; Y_}mYvJW  
  BOOL m_bShift; nJbtS#`G4  
  CString m_Path; $`APHjijN  
  CString m_Number; Z.d 7U~_  
  //}}AFX_DATA t c[n&X  
  // ClassWizard generated virtual function overrides Kqun^"Df  
  //{{AFX_VIRTUAL(CCaptureDlg) BeCWa>54i  
 public: R,)}>X|<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); h H <J,Wn  
 protected: ##KBifU"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .tkT<o-u<J  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ur*T%b9&  
  //}}AFX_VIRTUAL rI^zB mrr  
  // Implementation 17D"cP  
 protected: [qdRUV'  
  HICON m_hIcon; x2@U.r"zo  
  // Generated message map functions .R)PJc5^  
  //{{AFX_MSG(CCaptureDlg) "dsU>3u  
  virtual BOOL OnInitDialog();  ~UyV<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); aqYa{hXio  
  afx_msg void OnPaint(); <$6QDfa#  
  afx_msg HCURSOR OnQueryDragIcon(); Ys -T0  
  virtual void OnCancel(); 1?)Xp|O  
  afx_msg void OnAbout(); KQcs3F@t  
  afx_msg void OnBrowse(); "+\lws  
  afx_msg void OnChange(); J\J?yo 6  
 //}}AFX_MSG  e`d%-9  
 DECLARE_MESSAGE_MAP() Kh(ZU^{n  
}; xO1[>W  
#endif I96C i2)m  
\|]Z8t7  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _FXZm50\g{  
#include "stdafx.h" ;=geHiQHA  
#include "Capture.h" l_EM8pL,f  
#include "CaptureDlg.h" <cZGxff01  
#include <windowsx.h> ( xXGSx  
#pragma comment(lib,"hook.lib") ONx( ]  
#ifdef _DEBUG -6Oz^  
#define new DEBUG_NEW ?|WoIV.  
#undef THIS_FILE 9Rn? :B~W:  
static char THIS_FILE[] = __FILE__; PlF87j (  
#endif XQ%?  
#define IDM_SHELL WM_USER+1 RG3l.jL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LVc4CE f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .~Fp)O:!  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; CqHK%M  
class CAboutDlg : public CDialog g8Q5m=O*  
{ S{FROC~1R  
 public: `(v='$6}  
  CAboutDlg(); %uJ<M-@r=u  
  // Dialog Data NB\{'  
  //{{AFX_DATA(CAboutDlg) o }3uo6GIB  
  enum { IDD = IDD_ABOUTBOX }; E Q4KV  
  //}}AFX_DATA BBH0OiV=  
  // ClassWizard generated virtual function overrides AX?fuDLs  
  //{{AFX_VIRTUAL(CAboutDlg) p/JL9@:'  
 protected: HS{(v;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S!Omy:=;i  
  //}}AFX_VIRTUAL "jTKSgv+q5  
  // Implementation )uK{uYQl  
 protected: 56e r`=ms  
  //{{AFX_MSG(CAboutDlg) YLwnhy>dD  
  //}}AFX_MSG `W dD8E  
  DECLARE_MESSAGE_MAP() z\0 CE]#T  
}; R)F;py8)I  
J 8M$k/"X  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >$ NDv  
{ 5Xl /L  
 //{{AFX_DATA_INIT(CAboutDlg) <&&SX;  
 //}}AFX_DATA_INIT 0O\SU"bP  
} :8 jhiB)  
[zL7Q^~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?OE.O/~l  
{ A a= u+  
 CDialog::DoDataExchange(pDX); ;w6>"O$a  
 //{{AFX_DATA_MAP(CAboutDlg) s[K^9wz  
 //}}AFX_DATA_MAP <V7>?U l  
} UOGuqV-  
cTXri8K_  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) /,MJq#@K  
 //{{AFX_MSG_MAP(CAboutDlg) Mn$]I) $  
 // No message handlers #'-Sh7ycW  
 //}}AFX_MSG_MAP tG8jFou  
END_MESSAGE_MAP() ^K7ic,{  
oEx\j+}@n  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v~T7`  
: CDialog(CCaptureDlg::IDD, pParent) ew;ur?  
{ @WQK>-=(3  
 //{{AFX_DATA_INIT(CCaptureDlg) cFN'bftH4  
  m_bControl = FALSE; ' zEI;v  
  m_bAlt = FALSE; !IC-)C,q  
  m_bShift = FALSE; QJ F=UB  
  m_Path = _T("c:\\"); {^ m(,K_  
  m_Number = _T("0 picture captured."); K]qM~v<A  
  nCount=0; [97KBoSU  
  bRegistered=FALSE; s-Aw<Q)d  
  bTray=FALSE; op"$E1+  
 //}}AFX_DATA_INIT .MVYB\6Q0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ja]?&j  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); KJ?y@Q  
} 'DCFezdf3  
4<lQwV6=  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) uk9g<<3T  
{ zOHypazOTq  
 CDialog::DoDataExchange(pDX); Nrah;i+H\o  
 //{{AFX_DATA_MAP(CCaptureDlg) *d(SI<j  
  DDX_Control(pDX, IDC_KEY, m_Key); 9D 0dg(  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $s4Wkq  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 4D$;KokZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uK ("<u|  
  DDX_Text(pDX, IDC_PATH, m_Path); {/ LZcz[  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ?f*Q>3S)  
 //}}AFX_DATA_MAP 6cdMS[_SD(  
} 'q>2t}KG  
N7%TYs  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =H %-.m'f2  
//{{AFX_MSG_MAP(CCaptureDlg) @ct+7v~  
 ON_WM_SYSCOMMAND() X 6 lH|R  
 ON_WM_PAINT() l;"Ab?P\  
 ON_WM_QUERYDRAGICON() E RdL^T>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) oyk>vIZ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) KECElK3uj  
 ON_BN_CLICKED(ID_CHANGE, OnChange) x|0:P sE  
//}}AFX_MSG_MAP LhzMAW<L4  
END_MESSAGE_MAP() cBYfXI0`  
QC0!p"  
BOOL CCaptureDlg::OnInitDialog() TwvAj#j  
{ {ub/3Uh  
 CDialog::OnInitDialog(); =s}Xy_+:  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); T;\^#1  
 ASSERT(IDM_ABOUTBOX < 0xF000); Ch_xyuJ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]h!`IX  
 if (pSysMenu != NULL) >p])it[q&$  
 { +'#oz+  
  CString strAboutMenu; Ogg#jx(4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Aaw(Ed  
  if (!strAboutMenu.IsEmpty()) I\Glc=T*  
  { 9 L?;FY)_  
   pSysMenu->AppendMenu(MF_SEPARATOR); ogeL[7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0_yP\m  
  } V5D2\n3A  
 } b-@\R\T  
 SetIcon(m_hIcon, TRUE); // Set big icon cPn+<M#  
 SetIcon(m_hIcon, FALSE); // Set small icon R4e&^tI@*  
 m_Key.SetCurSel(0); Rt(J/%;  
 RegisterHotkey(); )F pJ 1  
 CMenu* pMenu=GetSystemMenu(FALSE); Gzt=u"FV  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,Vd7V}t  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); XD-^w_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mzD^ Y<LTd  
 return TRUE; // return TRUE unless you set the focus to a control ~^N]y b  
} 5V-jMB  
{SG>'KXZ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >_ X/[<  
{ .~=HgOJ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Omag)U)IPh  
 { )%Y IGV;&  
  CAboutDlg dlgAbout; h<p3'  
  dlgAbout.DoModal(); UQd6/mD`e  
 } 80ZnM%/}  
 else , fb( WY  
 { h ?#@~  
  CDialog::OnSysCommand(nID, lParam); W7UtA.2LT  
 } FN )d1q(~  
} u/AT-e r;  
yu&Kh4AP  
void CCaptureDlg::OnPaint() =^h~!ovj:  
{ *j*Du+  
 if (IsIconic()) 3@5p"X  
 { BIWD/ |LQ  
  CPaintDC dc(this); // device context for painting &K:' #[3V  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); EychR/s  
  // Center icon in client rectangle tLX,+P2|  
  int cxIcon = GetSystemMetrics(SM_CXICON); uhn%lV]  
  int cyIcon = GetSystemMetrics(SM_CYICON); 9 Aivf+  
  CRect rect; Ly (P=M>"y  
  GetClientRect(&rect); K 6pw8  
  int x = (rect.Width() - cxIcon + 1) / 2; ZL%VOxYqi  
  int y = (rect.Height() - cyIcon + 1) / 2; R]b! $6Lt  
  // Draw the icon WOndE=(V  
  dc.DrawIcon(x, y, m_hIcon); 17py ).\  
 } ]b[,LwB\`~  
 else aqQ o,5U>  
 { EI`vVI  
  CDialog::OnPaint(); Xt(! a  
 } =Nl5{qYz^&  
} ha'qIT 3&  
:|XCnK0  
HCURSOR CCaptureDlg::OnQueryDragIcon() %yw=[]Vjze  
{ irFc}.dI  
 return (HCURSOR) m_hIcon; cS~!8`Fwy  
} p~>_T7ze  
+Hy4s[_|  
void CCaptureDlg::OnCancel() h=f6~5l5  
{ Ff/Ig]Lb  
 if(bTray) ZDlu1>Q  
  DeleteIcon(); >Pkdu}xP3  
  CDialog::OnCancel(); E*4t8  
} u&3EPu  
??TdrTS  
void CCaptureDlg::OnAbout() $5/\Z  
{ <lx^aakk!  
 CAboutDlg dlg; C5B=NAc  
 dlg.DoModal(); T5{T[YdX<  
} ;l`X!3  
||gEs/6-  
void CCaptureDlg::OnBrowse() XZBj=2~-3  
{ -,@bA @&  
 CString str; vcOsq#UW  
 BROWSEINFO bi; 77_g}N  
 char name[MAX_PATH]; 1HXlHic  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); w&+\Wo;([b  
 bi.hwndOwner=GetSafeHwnd(); x?>!UqgkY  
 bi.pszDisplayName=name; 49y *xMn  
 bi.lpszTitle="Select folder"; yr{5Rp05=  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; G* Ib^;$u  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); )ys=+Pz  
 if(idl==NULL) ;:^ Lv  
  return; v+7*R)/  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <dJIq"){  
 str.ReleaseBuffer(); sVlZNj9i"  
 m_Path=str; +QQ YPEx+  
 if(str.GetAt(str.GetLength()-1)!='\\') J{^n=X9M0J  
  m_Path+="\\"; IE@ z@+\(  
 UpdateData(FALSE); 7zi"caY  
} q'fPNQg  
v?%0~!  
void CCaptureDlg::SaveBmp() 6BR \iZ  
{ /W?z0tk`  
 CDC dc; 0~:e SWz=  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); JgxA^>|9;  
 CBitmap bm; &,_?>.\[<  
 int Width=GetSystemMetrics(SM_CXSCREEN); t{[gKV-b  
 int Height=GetSystemMetrics(SM_CYSCREEN); o9~h%&  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ZtKQ]jV&@  
 CDC tdc; PGMv(}%;  
 tdc.CreateCompatibleDC(&dc); '[n)N@h  
 CBitmap*pOld=tdc.SelectObject(&bm); +i_'gDy$  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); IMw "eV  
 tdc.SelectObject(pOld); h<Jc;ht  
 BITMAP btm; s&Z35IM8|  
 bm.GetBitmap(&btm); @-}D7?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .<0=a|IAz  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /kAwe *)  
 BITMAPINFOHEADER bih; fuQ4rt[i  
 bih.biBitCount=btm.bmBitsPixel; zZ<ns+h  
 bih.biClrImportant=0; P}+2>EU  
 bih.biClrUsed=0; wK2yt?  
 bih.biCompression=0; L,yA<yrC  
 bih.biHeight=btm.bmHeight; p6B .s_G4  
 bih.biPlanes=1; Zm`'MsgFr  
 bih.biSize=sizeof(BITMAPINFOHEADER); Y1m}@k,+M  
 bih.biSizeImage=size; :Pj W:]  
 bih.biWidth=btm.bmWidth; Wk0>1 rlu  
 bih.biXPelsPerMeter=0; uDpf2(>s  
 bih.biYPelsPerMeter=0; AB/,S  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); }g%KvYB_  
 static int filecount=0; C+X)">/+L  
 CString name; "sz.v<F0:s  
 name.Format("pict%04d.bmp",filecount++); Y] D7i?3N  
 name=m_Path+name; E_ o{c5N  
 BITMAPFILEHEADER bfh; 4jDs0Hn"  
 bfh.bfReserved1=bfh.bfReserved2=0; +3NlkN#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); deR$  
 bfh.bfSize=54+size; R>/QA RX  
 bfh.bfOffBits=54; 7KvXTrN!9  
 CFile bf; # q0Ub-  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ </K%i;l  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ~E^yM=:h  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8o*\W$K@  
  bf.WriteHuge(lpData,size); va`l*N5  
  bf.Close(); 3bT6W, J4T  
  nCount++; /}h71V!  
 } NqQM! B]  
 GlobalFreePtr(lpData); B FzcoBu-  
 if(nCount==1) 0A) Vtj$  
  m_Number.Format("%d picture captured.",nCount); f_Wkg)g  
 else v>x {jZkFL  
  m_Number.Format("%d pictures captured.",nCount); 6Tm Rc  
  UpdateData(FALSE); FYx `o\  
} Pg!;o= { M  
 ~ LJ>WA  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >N+bU{s  
{ m &0(%  
 if(pMsg -> message == WM_KEYDOWN) iBGSBSeL&  
 { QN{}R;s  
  if(pMsg -> wParam == VK_ESCAPE) ::3iXk)  
   return TRUE;  kg/+vJ  
  if(pMsg -> wParam == VK_RETURN) v!pj v%  
   return TRUE; Wx']tFn"  
 } NB!'u) lFD  
 return CDialog::PreTranslateMessage(pMsg); vp )}/&/  
} 2A@Y&g(6T7  
4 ~MJ4:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l0:e=q2Ax  
{ 0Y38 T)k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ zkT`] @`J  
  SaveBmp(); =|qt!gY)Y  
  return FALSE; . BYKdxa  
} avHD'zU}N  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ U- *8%>Qp  
 CMenu pop; z^a6%N  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]RJb;  
 CMenu*pMenu=pop.GetSubMenu(0);  &*>C PO  
 pMenu->SetDefaultItem(ID_EXITICON); #Vn>ue+?  
 CPoint pt; %ojR?=ON  
 GetCursorPos(&pt); uK4'n+_>\  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9QX ~a X  
 if(id==ID_EXITICON) ')~Y  
  DeleteIcon(); [0tf Y0  
 else if(id==ID_EXIT) $tt0D?$4  
  OnCancel(); U'Ja\Ek/f  
 return FALSE; Dh!iY0Lz  
} c5wkzY h  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <.AC=4@V  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) @qO8Jg"Q  
 AddIcon(); xtIehr0{$I  
 return res; Q~b M  
} ?sjZ13 SUa  
dm/\uE'l  
void CCaptureDlg::AddIcon() /BjGAa(  
{ z[KN^2YS  
 NOTIFYICONDATA data; C<wj?!v,F[  
 data.cbSize=sizeof(NOTIFYICONDATA); Ddm76LS  
 CString tip; @F3-Ugm  
 tip.LoadString(IDS_ICONTIP); mSk :7ozZ  
 data.hIcon=GetIcon(0); \@}$Wjsl  
 data.hWnd=GetSafeHwnd(); 4xAlaOw5M  
 strcpy(data.szTip,tip); V M\Z<}C  
 data.uCallbackMessage=IDM_SHELL; O"J.k&C<,  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !OZh fMVd  
 data.uID=98; 49J+&G?)j  
 Shell_NotifyIcon(NIM_ADD,&data); ![P(B0Ct/  
 ShowWindow(SW_HIDE); ]|$$:e^U9  
 bTray=TRUE; "$E!_  
} 2YE]?!   
^;k _  
void CCaptureDlg::DeleteIcon() <v7KE*#  
{ {OhkuON  
 NOTIFYICONDATA data; B[0,\>  
 data.cbSize=sizeof(NOTIFYICONDATA); wx"6",M  
 data.hWnd=GetSafeHwnd(); #G!Adj+p5  
 data.uID=98; ,^+R%7mv  
 Shell_NotifyIcon(NIM_DELETE,&data); E_' n4@}Cx  
 ShowWindow(SW_SHOW); )[M<72  
 SetForegroundWindow(); da?th  
 ShowWindow(SW_SHOWNORMAL); :5cu,&<Gv  
 bTray=FALSE; d Xo'#.  
} JbC\l  
>KClH'R2  
void CCaptureDlg::OnChange() V+a%,sI  
{ J,=E5T}U^  
 RegisterHotkey(); &9lc\Y4PY  
} rLw[y$2  
RBD7mpd  
BOOL CCaptureDlg::RegisterHotkey() e>zk3\D!  
{ vBn=bb'W  
 UpdateData(); 33KPo0g7  
 UCHAR mask=0; 6 % y)  
 UCHAR key=0; NdSxWrD`m  
 if(m_bControl) O+o%C*`K  
  mask|=4; +heS\I_Mp  
 if(m_bAlt) e$^!~+J7  
  mask|=2; CG>2 ,pP,  
 if(m_bShift) !zkEh9G  
  mask|=1; [ 6o:v8&3  
  key=Key_Table[m_Key.GetCurSel()]; yzNX2u1  
 if(bRegistered){ 0^lL,rC   
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6-X?uaY)os  
  bRegistered=FALSE; o>A%}YU  
 } MJ"Mn^:/  
 cMask=mask; So 6cm|{  
 cKey=key; KW6" +,Th  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Sd{"A0[A|  
 return bRegistered; >T*g'954xF  
} Rw{v"n  
~\}EROb <  
  四、小结 0(g MR  
[pWDhY  
  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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