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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: 8Jj0-4]  
  ]?`p_G3O  
  一、实现方法 x 4</\o  
F5MPy[  
  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: 9lJj/  
\=_q{  
#pragma data_seg("shareddata") ^(*O$N*#  
HHOOK hHook =NULL; //钩子句柄 H;|:r[d!  
UINT nHookCount =0; //挂接的程序数目 |uBC0f  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 a&"*UJk<?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 H`lD@q'S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey "@w%TcA  
static int KeyCount =0; E}9ldM=]s  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 rI+w1';C1  
#pragma data_seg() z xUj1  
>?eTbtP  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Pm(:M:a  
uE`|0  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: GPLt<K!<#  
'2$!thm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR DF|s,J`98  
cKey,UCHAR cMask) %H@76NvEz  
{ E2H<{Q   
 BOOL bAdded=FALSE; ~C7<a48x  
 for(int index=0;index<MAX_KEY;index++){ ;OU>AnWr(&  
  if(hCallWnd[index]==0){ ;;hyjFGq%  
   hCallWnd[index]=hWnd; {FY[|:Cp  
   HotKey[index]=cKey; t`ceVS  
   HotKeyMask[index]=cMask; A=d$ir K[  
   bAdded=TRUE; 6H,=S`V]EK  
   KeyCount++; /JubiLEK  
   break; YQdX>k  
  } hUvuq,LH_  
 } ##FNq#F  
 return bAdded; {V% O4/  
} Ca@=s  
//删除热键 QsJW"4d  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0&IXzEOr  
{ RrdtU7i3  
 BOOL bRemoved=FALSE; L"!ZY  
 for(int index=0;index<MAX_KEY;index++){ ~!:Sp_y  
  if(hCallWnd[index]==hWnd){ tK}p05nPhl  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k+#l;<\2  
    hCallWnd[index]=NULL; 5vX 8mPR_  
    HotKey[index]=0; 6y,P4O*q  
    HotKeyMask[index]=0; _s^:zPl  
    bRemoved=TRUE;  L|lmStwe  
    KeyCount--; ! M&un*  
    break; Wo9psv7.  
   } #t2UPLO~  
  } ]ZzG!7  
 } q6JW@GT  
 return bRemoved; tb?F}MEe  
} Z<|_+7T  
Iei7!KLW  
R 4$Q3vcH  
  DLL中的钩子函数如下: Sja{$zL+W  
WCmNibj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sC5uA .?>9  
{ 4!~ .6cp3  
 BOOL bProcessed=FALSE; Qj<{oZp&  
 if(HC_ACTION==nCode) QK!:q{  
 { lAn+gDP  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Q|= Q]$d  
   switch(wParam) DxKfWb5 R  
   {  w-H%B`/  
    case VK_MENU: LX\*4[0%K  
     MaskBits&=~ALTBIT; C7 ]DJn  
     break; d9-mWz(V+  
    case VK_CONTROL:  Ep\  
     MaskBits&=~CTRLBIT; k/_8!^:'  
     break; FL#g9U>  
    case VK_SHIFT: Uy59zB2|=  
     MaskBits&=~SHIFTBIT; r3H}*Wpf  
     break; ^/C $L8#  
    default: //judge the key and send message k'ZUBTRq!  
     break; Go\} A:|s  
   } 2@3.xG  
   for(int index=0;index<MAX_KEY;index++){ $TA6S+  
    if(hCallWnd[index]==NULL) 1KYbL8c  
     continue; 8S1P&+iKs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RHx+HBZ  
    { )0U3w#,JQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !<=%;+  
     bProcessed=TRUE; RJRq` T|m  
    } ?#*  
   } {;iH Yr-zs  
  } /}nrF4S  
  else if((lParam&0xc000ffff)==1){ //有键按下 _D>as\dP  
   switch(wParam) uqa4&2(I=j  
   { UROj9CO v  
    case VK_MENU: G=C5T(  
     MaskBits|=ALTBIT; ^0Q=#p  
     break; 50`iCD  
    case VK_CONTROL: EO].qN-8  
     MaskBits|=CTRLBIT; "s>fV9YyZ  
     break; 2fzKdkJhe  
    case VK_SHIFT: aI={,\  
     MaskBits|=SHIFTBIT; $K?T=a;z  
     break; S~k 0@  
    default: //judge the key and send message %9QMzz5  
     break; 9P7xoXJ@y  
   } "B9[cDM&  
   for(int index=0;index<MAX_KEY;index++){ &N"'7bK6n  
    if(hCallWnd[index]==NULL) 5>ADw3z'  
     continue; 0Oc}rRH(C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i5 L:L  
    { <o&o=Y8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DIG0:)4R.  
     bProcessed=TRUE; Jtp>m?1Ve  
    } [;?"R-V"z  
   } JFG",09]  
  } f`hyYp`d5  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 egI{!bZg'\  
   for(int index=0;index<MAX_KEY;index++){ ,pyQP^u-  
    if(hCallWnd[index]==NULL) QGH h;  
     continue; -yC:?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3tT|9Tb@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ` URSv,(  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 8"km_[JE e  
   } c$Xe.:QY  
  } (]3ERPn#y  
 } cW)Oi^q%o2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); NZo<IKD$  
} oe(9mYWKa6  
t1e4H=d>  
  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: 01LZE,.  
%bIsrQ~B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1mJbQ#5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tS\=<T  
~@T+mHny  
  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: GA|/7[I}  
JsmbW|t^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^uyNv-'F  
{ E tJ~dL)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) VLcyPM@"Q!  
 { brg":V1a  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 j|VXC(6 P,  
  SaveBmp(); 81g9ZV(4  
  return FALSE; Ro'jM0(KE  
 } Md8(`@`o  
 …… //其它处理及默认处理 |Du,UY/  
} >vlQ|/C  
r0F_;  
RVc)") hQj  
  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。  9t{|_G  
}FPM-M3y  
  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。 {UB%(E[Mr  
HUj+-  
  二、编程步骤 [O^}rUqq  
0TTIaa$  
  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"; DpA\r_D  
f%2%T'Q  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; hzaLx8L  
:3*`IB !  
  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; )fNGB]%  
q}>M& *  
  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; L)q`D2|'  
Uh|TDuM  
  5、 添加代码,编译运行程序。 ]{YN{  
! L4dUMo  
三、程序代码 Dba+z-3Nzy  
l <:`~\#  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "E.\6sC  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) saatU;V  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ K<c2PFo)Q  
#if _MSC_VER > 1000 y:Z$LmPc<  
#pragma once %VzYqj_P"  
#endif // _MSC_VER > 1000 \WWG>OUh.U  
#ifndef __AFXWIN_H__ :I2H&,JT  
#error include 'stdafx.h' before including this file for PCH YMi/uy  
#endif T3=(`  
#include "resource.h" // main symbols F4Rr26M  
class CHookApp : public CWinApp );=Q] >  
{ sNL+F  
 public: 4 GUA&qs  
  CHookApp(); ,1,&b_  
  // Overrides x@h tx?   
  // ClassWizard generated virtual function overrides J;S-+  
  //{{AFX_VIRTUAL(CHookApp) eaEbH2J  
 public: W+KF2(lB  
  virtual BOOL InitInstance(); Zw+=ng.q?  
  virtual int ExitInstance(); 8pqs?L@W  
  //}}AFX_VIRTUAL Gc wt7~  
  //{{AFX_MSG(CHookApp) 9 +}cE**=d  
  // NOTE - the ClassWizard will add and remove member functions here. ri:,q/-  
  // DO NOT EDIT what you see in these blocks of generated code ! '}_=kp'X  
  //}}AFX_MSG _0K.Fk*(!  
  DECLARE_MESSAGE_MAP() f6Ml[!aU  
}; X1Qr _o-BR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ThtMRB)9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mIvnz{_d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mxgqS=`  
BOOL InitHotkey(); 7m\vRMK  
BOOL UnInit(); -!l^]MU  
#endif L ${m/@9  
>zQNHSi  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Uls+n@\!  
#include "stdafx.h" Y.7}  
#include "hook.h" MZ WmlJ   
#include <windowsx.h> Y,'%7u  
#ifdef _DEBUG E$ {J  
#define new DEBUG_NEW n!ZMTcK8  
#undef THIS_FILE mB~~_]M N  
static char THIS_FILE[] = __FILE__; =LOk13l\"  
#endif `g--QR  
#define MAX_KEY 100 \6{LR&  
#define CTRLBIT 0x04 . @@an;C  
#define ALTBIT 0x02 $%Z3;:<Uf-  
#define SHIFTBIT 0x01 *#zS^b n  
#pragma data_seg("shareddata") / $_M@>  
HHOOK hHook =NULL; Apmw6cc  
UINT nHookCount =0; ?IILt=)<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Y3k[~A7X  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 19p8B&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey uxb:^d?D!  
static int KeyCount =0; :5jexz."M  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #BsW  
#pragma data_seg() P].eAAXnP  
HINSTANCE hins; }-74 f  
void VerifyWindow(); 9mDn KW  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) "Kq>#I'%W  
//{{AFX_MSG_MAP(CHookApp) 0'`S,  
// NOTE - the ClassWizard will add and remove mapping macros here. 6lsEGe  
// DO NOT EDIT what you see in these blocks of generated code! `"c'z;  
//}}AFX_MSG_MAP $Zxt&a  
END_MESSAGE_MAP()  t!jYu<P  
"TNVD"RLY  
CHookApp::CHookApp() J:AMnUOcDi  
{ @MOCug4  
 // TODO: add construction code here, xz8G}Ku  
 // Place all significant initialization in InitInstance FIS "Z(  
} {rDq_^  
JGis"e  
CHookApp theApp; s9i|mVtm8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) oR#Ob#&  
{ >g]ON9CGH  
 BOOL bProcessed=FALSE; <UT>PCNG  
 if(HC_ACTION==nCode) N'QqJe7Z  
 { 9,scH65x  
  if((lParam&0xc0000000)==0xc0000000){// Key up aBxiK[[`  
   switch(wParam) ]ENK8bW  
   { {~_ Y _-  
    case VK_MENU: Bd&`Xfebj  
     MaskBits&=~ALTBIT; WI&lj<*  
     break; gw+eM,Yp  
    case VK_CONTROL: gfN2/TDC]P  
     MaskBits&=~CTRLBIT; !zR)D|w&  
     break; w#9_eq|3  
    case VK_SHIFT: Xh}&uZ`A  
     MaskBits&=~SHIFTBIT; 9 I{/zKq  
     break; 8Q=ZH=SQK  
    default: //judge the key and send message ezUQ> e  
     break; RYy,wVh}  
   } D:9 2\l  
   for(int index=0;index<MAX_KEY;index++){ Q+'nw9:;T  
    if(hCallWnd[index]==NULL) UV@0gdy[  
     continue; #K4*6LI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [Gtb+'8  
    { o_$&XNC_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ($8t%jVWJJ  
     bProcessed=TRUE; I]9 C_  
    } \f%.n]>  
   } ^_W40/c3  
  } 2khh4?|\  
  else if((lParam&0xc000ffff)==1){ //Key down e;h,V(  
   switch(wParam) RV;!05^<  
   { 0[Eb .2I  
    case VK_MENU: ykmv'a$-4  
     MaskBits|=ALTBIT; |>+uw|LtZ  
     break; |##GIIv;i  
    case VK_CONTROL: t,HFz6   
     MaskBits|=CTRLBIT; .Y\EE;8%  
     break; Ee)xnY%(  
    case VK_SHIFT: ^2C>L}  
     MaskBits|=SHIFTBIT; jn=:G+0  
     break; p!DP`Ouc3\  
    default: //judge the key and send message =wrP:wYF  
     break; J# EP%  
   } :c=.D;,  
   for(int index=0;index<MAX_KEY;index++) jDX>izg;V  
   { -[heV|$;  
    if(hCallWnd[index]==NULL) {v,)G)obWw  
     continue; -c+]Wm"\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i=#F)AD^5#  
    { 9]7u _  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); h/m6)m.D  
     bProcessed=TRUE; 5k$vlC#[H  
    } WU)Ss`s \  
   } !0" nx{7.  
  } N'?u1P4G  
  if(!bProcessed){ d1G8*YO@  
   for(int index=0;index<MAX_KEY;index++){ H M:r0_  
    if(hCallWnd[index]==NULL) T1bd:mC}n  
     continue; VteEDL/w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) # {PmNx%M  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^$NJD  
   } 6R4<J% $P  
  } ^R~~L  
 } <[i}n55  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); n>FY?  
} e|lD:_1i  
i zwUS!5e  
BOOL InitHotkey() c^9tYNn  
{ fk{0d  
 if(hHook!=NULL){ DQ80B)<O  
  nHookCount++; `^6 ,kI-c  
  return TRUE; ~ap2m  
 } 6q/ ?-Qcy  
 else AK@L32-S  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ."6[:MF  
  if(hHook!=NULL) lr3mE  
   nHookCount++; E=w3=\JP  
  return (hHook!=NULL); nc?B6IV  
} z]@6fM[  
BOOL UnInit() c$h9/H=~  
{ h"W8N+e\  
 if(nHookCount>1){ &JhX +'U  
  nHookCount--; -t-tn22  
  return TRUE; \?lz&<  
 } 5v _P Oq  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,hRN\Kt)p  
 if(unhooked==TRUE){ $>q@SJ1q  
  nHookCount=0; 1cC1*c0Z  
  hHook=NULL; c0rk<V%5+  
 } m9":{JI.w  
 return unhooked; D1T@R)j  
} #b)e4vwCq  
3yO=S0`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KoBW}x9Jp  
{ DuF"*R~et  
 BOOL bAdded=FALSE; m_7 nz!h  
 for(int index=0;index<MAX_KEY;index++){ dh -,E  
  if(hCallWnd[index]==0){ d) ahF[82  
   hCallWnd[index]=hWnd; m%r/O&g  
   HotKey[index]=cKey; #wR;|pN  
   HotKeyMask[index]=cMask; eJ@~o{,?>  
   bAdded=TRUE; GbZ;#^S  
   KeyCount++; K=\O5#F?3  
   break;  jNyoN1M  
  } "484 n/D  
 } [V}, tO|  
 return bAdded; iK;opA"  
} CIC[1,  
Lx[ ,Z,kD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Wf26  
{ |ys0`Vb=$  
 BOOL bRemoved=FALSE; s0"e'  
 for(int index=0;index<MAX_KEY;index++){ u{e-G&]^;  
  if(hCallWnd[index]==hWnd){ \>Zvev!s  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @N.jB#nEb  
    hCallWnd[index]=NULL; sen=0SB/  
    HotKey[index]=0; UKBJ_r  
    HotKeyMask[index]=0; 6lFfS!ZFA  
    bRemoved=TRUE; ~r*P]*51x  
    KeyCount--; dcfe_EuT  
    break; nsuX*C7  
   } n1v5Q2xw  
  } g@ith&*=h  
 } [(mlv42"  
 return bRemoved; nE W31 8  
} sRhKlUJG  
*_-'/i  
void VerifyWindow() j`>^1Q  
{ !CY&{LEYn0  
 for(int i=0;i<MAX_KEY;i++){ [iS$JG-  
  if(hCallWnd!=NULL){ iCQ>@P]nE  
   if(!IsWindow(hCallWnd)){ 7jG(<!,  
    hCallWnd=NULL; ROb\Rx m  
    HotKey=0; dK9Zg,DZL  
    HotKeyMask=0;  kLP0{A  
    KeyCount--; UQ?%|y*Kc  
   } Xrqx\X  
  } zu\`1W^  
 } 6 ,b"  
} j<yiNHC  
P 7D!6q  
BOOL CHookApp::InitInstance() )%Iv[TB[  
{ YwDt.6(+,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^QX bJJ  
 hins=AfxGetInstanceHandle(); Dm0a.J v  
 InitHotkey(); n6Z|Q@F  
 return CWinApp::InitInstance(); Y3U9:VB  
} Me3dpF  
2DDsWJ;  
int CHookApp::ExitInstance() \?fIt?  
{ } p:%[  
 VerifyWindow(); 6" B%)0  
 UnInit(); 5<YzalNf  
 return CWinApp::ExitInstance(); V9%aBkf8w  
} ?&+9WJ<M  
:!TI K1  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file FY3IUG  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5"KlRuv%  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ v3[@1FQ"  
#if _MSC_VER > 1000 HLK@xKD<  
#pragma once )xU-;z0"~  
#endif // _MSC_VER > 1000 6;b9swmh  
fxQN+6;  
class CCaptureDlg : public CDialog $iw%(H  
{ %yS3&Ju  
 // Construction 3251Vq %  
 public: 1R%1h9I4'  
  BOOL bTray; ro~+j}*   
  BOOL bRegistered; .?W5{U  
  BOOL RegisterHotkey(); @z`@f"l  
  UCHAR cKey; JK_OZ  
  UCHAR cMask; ))h6~1`  
  void DeleteIcon(); xyh.N)  
  void AddIcon(); $7Jo8^RE  
  UINT nCount; }:Z9Vc ZP`  
  void SaveBmp(); N_C;&hJN$w  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4_?7&G0(  
  // Dialog Data 'fd1Pj9~$  
  //{{AFX_DATA(CCaptureDlg) i b6^x:HGU  
  enum { IDD = IDD_CAPTURE_DIALOG }; ( )T[$.(  
  CComboBox m_Key; G=9d&N  
  BOOL m_bControl; a:STQk V  
  BOOL m_bAlt; ^%T7.1'x  
  BOOL m_bShift; io2)1cE&f  
  CString m_Path; R!\EK H  
  CString m_Number; 3,X/,'  
  //}}AFX_DATA :Ixx<9c.  
  // ClassWizard generated virtual function overrides 9"{W,'r&d  
  //{{AFX_VIRTUAL(CCaptureDlg) j7QX ,_Q  
 public: `TLzVB-j3  
  virtual BOOL PreTranslateMessage(MSG* pMsg); {tP%epQ  
 protected: B2=\2<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o2H1N~e#c  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); G@ \Pi#1  
  //}}AFX_VIRTUAL ' I}: !Z  
  // Implementation J4$! 68  
 protected: .^(/n9|o-  
  HICON m_hIcon; +C]&2zc.  
  // Generated message map functions v6(E3)J7  
  //{{AFX_MSG(CCaptureDlg) 256LHY|6  
  virtual BOOL OnInitDialog(); y2L#:[8  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }ut]\]b  
  afx_msg void OnPaint(); <U Zd;e@  
  afx_msg HCURSOR OnQueryDragIcon(); L:nXWz  
  virtual void OnCancel(); wucV_p.E  
  afx_msg void OnAbout(); *Nb#W!  
  afx_msg void OnBrowse(); $^/0<i$   
  afx_msg void OnChange(); <i\A_qqc/  
 //}}AFX_MSG C@\{ehG  
 DECLARE_MESSAGE_MAP() knp>m,w  
}; cR7wx 0Aj  
#endif R[tC^]ai  
l: |D,q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1%[_`J;>Z  
#include "stdafx.h" X@N$Z{  
#include "Capture.h" q<vf,D@{ !  
#include "CaptureDlg.h" I&yVx8aH}  
#include <windowsx.h> Wzq>JNn y  
#pragma comment(lib,"hook.lib") c~}l8M %  
#ifdef _DEBUG Tb;d.^  
#define new DEBUG_NEW M)-6T{[IT  
#undef THIS_FILE \ gwXH  
static char THIS_FILE[] = __FILE__; J97R0  
#endif koG{ |elgB  
#define IDM_SHELL WM_USER+1 "Y: /= Gx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l~:v (R5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (46 {r}_O  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :;;E<74e i  
class CAboutDlg : public CDialog \/`?  
{ =JLh?Wx  
 public: x+5k <Xi}  
  CAboutDlg(); SUCU P<G  
  // Dialog Data 9Ru;`  
  //{{AFX_DATA(CAboutDlg) /lhz],w  
  enum { IDD = IDD_ABOUTBOX }; }Rvm &?~O  
  //}}AFX_DATA sfT+i;p  
  // ClassWizard generated virtual function overrides RF}X ER  
  //{{AFX_VIRTUAL(CAboutDlg) j-@kW'K  
 protected: +>^7vq-\'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]w).8=I  
  //}}AFX_VIRTUAL vYmSKS  
  // Implementation -F/st  
 protected: BcWcdr+}9  
  //{{AFX_MSG(CAboutDlg) `bI)<B  
  //}}AFX_MSG `1` f*d v  
  DECLARE_MESSAGE_MAP() <Cpp?DW_  
}; YB))S!;Ok  
^WYQ]@rh3  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) QWnndI_4p  
{ qZk'tRv  
 //{{AFX_DATA_INIT(CAboutDlg) FwAKP>6*  
 //}}AFX_DATA_INIT @~ Dh'w2q  
} c~,23wP1  
eitu!=u  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) b8KsR=]4I  
{ c{#yx_)V&  
 CDialog::DoDataExchange(pDX); \0;(VLN'U  
 //{{AFX_DATA_MAP(CAboutDlg) )+y G+  
 //}}AFX_DATA_MAP 8;P2A\ X  
} i%Z2wP.o  
;^u*hZN[Up  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) q z&+=d@  
 //{{AFX_MSG_MAP(CAboutDlg) t G.(flW,  
 // No message handlers m4w ') r~  
 //}}AFX_MSG_MAP )emOKS  
END_MESSAGE_MAP() t@oK~ Nr  
`iKj  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) * A|-KKo\  
: CDialog(CCaptureDlg::IDD, pParent) V\~WvV  
{ oP?YA-#nc  
 //{{AFX_DATA_INIT(CCaptureDlg) OKOu`Hz@  
  m_bControl = FALSE; yoe}$f4  
  m_bAlt = FALSE; H[Q_hY[>V  
  m_bShift = FALSE; r`\A nT?  
  m_Path = _T("c:\\"); mg:!4O$K  
  m_Number = _T("0 picture captured."); iTo k[uJ}  
  nCount=0; `s#Hq\C  
  bRegistered=FALSE; *ZSdl 0e  
  bTray=FALSE; A~ (l{g  
 //}}AFX_DATA_INIT 2(!fg4#+  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 KU9Z"9#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Rf %HIAVE  
} hjx)D  
NtGn88='{  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) J'&# mDU  
{ E4.SF|=x  
 CDialog::DoDataExchange(pDX); !/{+WHxIr|  
 //{{AFX_DATA_MAP(CCaptureDlg) Oc?+M 5  
  DDX_Control(pDX, IDC_KEY, m_Key); &p UZDjo?  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); R>@uY( >dJ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Vn=qV3OE]  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); KLQTKMNv  
  DDX_Text(pDX, IDC_PATH, m_Path); 2GmpCy`L"  
  DDX_Text(pDX, IDC_NUMBER, m_Number); mY!iu(R1  
 //}}AFX_DATA_MAP ?dZt[vAMn  
} NF$\^WvYSP  
N[|Nxm0z/C  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) X~.f7Ao[  
//{{AFX_MSG_MAP(CCaptureDlg) &xZyM@  
 ON_WM_SYSCOMMAND() AN:@fZ  
 ON_WM_PAINT() OK|qv[  
 ON_WM_QUERYDRAGICON() " K*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?/*~;fM  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) JOn yrks  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4JIYbb-a'  
//}}AFX_MSG_MAP lG<hlYckv  
END_MESSAGE_MAP() I,6/21kO  
p4u5mM  
BOOL CCaptureDlg::OnInitDialog() "I- w  
{ ,38Eq`5&W  
 CDialog::OnInitDialog(); Tsb{25`+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 'fwU]Hm  
 ASSERT(IDM_ABOUTBOX < 0xF000); &sVvWNO#2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); VzS&`d.h  
 if (pSysMenu != NULL)  @gGRm  
 { 6~meM@  
  CString strAboutMenu; 'WyTI^K9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?wpB`  
  if (!strAboutMenu.IsEmpty()) VxO%rq3  
  { <oMUQ*OtV  
   pSysMenu->AppendMenu(MF_SEPARATOR); }1 vT)  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _1Z=q.sC  
  } $WQq? 1.9  
 } TB6m0qX(  
 SetIcon(m_hIcon, TRUE); // Set big icon >"3>s%  
 SetIcon(m_hIcon, FALSE); // Set small icon O!1TthI  
 m_Key.SetCurSel(0); <msxHw  
 RegisterHotkey(); s$h] G[x  
 CMenu* pMenu=GetSystemMenu(FALSE); !7B\Xl'S  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )o _j]K+xI  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); {[Q0qi =  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); d?,M/$h  
 return TRUE; // return TRUE unless you set the focus to a control 0\{BWNK  
} OU DcY@x~  
^ ?hA@{T/1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %%%fL;-y  
{ Wk;5/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Pj#'}ru!  
 { {y kYW%3s  
  CAboutDlg dlgAbout; ER&UBUu"  
  dlgAbout.DoModal(); 5 +9 Ze9  
 } :bU(S<%M  
 else Ac k}QzXO  
 { f5RE9%.#~  
  CDialog::OnSysCommand(nID, lParam); /G{_7cb  
 } 1MkI0OZE  
} `xS{0P{uj  
TTNk r`  
void CCaptureDlg::OnPaint() ("7M b{  
{ p 5u_1U0  
 if (IsIconic()) <S"~vKD'  
 { De  *7OC  
  CPaintDC dc(this); // device context for painting :Gqy>)CxX  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Tn-C>=tR~%  
  // Center icon in client rectangle DdV'c@rq+  
  int cxIcon = GetSystemMetrics(SM_CXICON); V% TH7@y  
  int cyIcon = GetSystemMetrics(SM_CYICON); o(A|)c4k  
  CRect rect; ;bu#8,  
  GetClientRect(&rect); T0HuqJty  
  int x = (rect.Width() - cxIcon + 1) / 2; W\*-xf|"d  
  int y = (rect.Height() - cyIcon + 1) / 2; sE(HZR1  
  // Draw the icon 8Ad606  
  dc.DrawIcon(x, y, m_hIcon); A!W0S  
 } d?idTcgs  
 else m"tOe?  
 { zQy"m-Q  
  CDialog::OnPaint(); 3ucP(Ex@tg  
 } CCijf]+  
} JM$.O;y -  
nHFrG =o,  
HCURSOR CCaptureDlg::OnQueryDragIcon() "LhUxnll  
{ .o{0+fC#  
 return (HCURSOR) m_hIcon; -XoPia2  
} pI`?(5iK6|  
~.Ik#At  
void CCaptureDlg::OnCancel() G* %t'jX9  
{ wl=61 Mb  
 if(bTray) tEd.'D8 s  
  DeleteIcon(); sf} Dh  
  CDialog::OnCancel(); k4J8O3E  
} JD>d\z2QC  
[ Mg8/Oy  
void CCaptureDlg::OnAbout() 2pHR_mrb  
{ ,n,RFa  
 CAboutDlg dlg; Lju7,/UD  
 dlg.DoModal(); UQ Co}vM  
} k?nQ?B W  
w-B^ [<  
void CCaptureDlg::OnBrowse() R  
{ u?ek|%Ok  
 CString str; I&c ~8Dw  
 BROWSEINFO bi; !4@G3Ae22  
 char name[MAX_PATH]; #4LFG\s  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~Z/ ^c,[:  
 bi.hwndOwner=GetSafeHwnd(); }Y(]6$uS  
 bi.pszDisplayName=name; $V>98M>j  
 bi.lpszTitle="Select folder"; !H][LXB~H  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7"X>?@  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  n]W_e  
 if(idl==NULL) K?x,T8<aW  
  return; SM0M%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 5`/@N{e  
 str.ReleaseBuffer(); .@ C{3$,VG  
 m_Path=str; Rn%N&1 Ef  
 if(str.GetAt(str.GetLength()-1)!='\\') Ko>&)%))$X  
  m_Path+="\\"; f67NWFX  
 UpdateData(FALSE); }0 hL~i  
} N<|$h5isq  
=tTqN+4  
void CCaptureDlg::SaveBmp() 2],_^XBvB  
{ p4>$z& _  
 CDC dc; #h!*dj"  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 9ch#}/7B  
 CBitmap bm; Z[!d*O%R_  
 int Width=GetSystemMetrics(SM_CXSCREEN); Ey{%XR+*;  
 int Height=GetSystemMetrics(SM_CYSCREEN);  1iT\df  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 23(=Xp3;>  
 CDC tdc; %WG9 dYdS  
 tdc.CreateCompatibleDC(&dc); 31+;]W=  
 CBitmap*pOld=tdc.SelectObject(&bm); {Ee>n^1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); B-.v0R`5  
 tdc.SelectObject(pOld); X#a`K]!B  
 BITMAP btm; .Jb$l$5'w  
 bm.GetBitmap(&btm); b<I9 MR  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; UnDgu4#R`A  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); DQ.v+C,  
 BITMAPINFOHEADER bih; ~\nBjM2  
 bih.biBitCount=btm.bmBitsPixel; ;32#t[i b  
 bih.biClrImportant=0; PHg48Y"Nd  
 bih.biClrUsed=0; et,GrL)l  
 bih.biCompression=0; jg  2qGC  
 bih.biHeight=btm.bmHeight; ^ OJyN,A  
 bih.biPlanes=1; t-u|U(n  
 bih.biSize=sizeof(BITMAPINFOHEADER); =bh*[ , -  
 bih.biSizeImage=size; ~H)4)r^  
 bih.biWidth=btm.bmWidth; "i.r@<)S  
 bih.biXPelsPerMeter=0; nm$Dd~mxW1  
 bih.biYPelsPerMeter=0; Thy=yz;p  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $DFv30 f  
 static int filecount=0; %,@vWmn  
 CString name; R`Aj|C z  
 name.Format("pict%04d.bmp",filecount++); ? Q@kg  
 name=m_Path+name; 7z6 b@$,  
 BITMAPFILEHEADER bfh; ub0zJTFJ#  
 bfh.bfReserved1=bfh.bfReserved2=0; k@>\LR/v  
 bfh.bfType=((WORD)('M'<< 8)|'B'); yDb'7(3-  
 bfh.bfSize=54+size; >e5 *prx+  
 bfh.bfOffBits=54; !U_ K&f  
 CFile bf; |6:=}dE#[  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $$i. O}  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .o%^'m"=D[  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )o1eWL}  
  bf.WriteHuge(lpData,size); Sydh2d  
  bf.Close(); ,7Y-k'7Kop  
  nCount++; a~h:qpg c  
 } bo"%0 ?3n  
 GlobalFreePtr(lpData); T[k4lM  
 if(nCount==1) n6WY&1ZE~  
  m_Number.Format("%d picture captured.",nCount); wo2@hav  
 else `i ,_aFB|  
  m_Number.Format("%d pictures captured.",nCount); )|j[uh6w o  
  UpdateData(FALSE); ?B@;QjhjiJ  
} mN `YuR~  
P47V:E%  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @ufo$?D  
{  9DQ)cy  
 if(pMsg -> message == WM_KEYDOWN) TjWE_Bq]g  
 { DVZdClAL  
  if(pMsg -> wParam == VK_ESCAPE) >!e<}84b  
   return TRUE; 05Fz@31~  
  if(pMsg -> wParam == VK_RETURN) 148V2H)  
   return TRUE; ?[TfpAtQ`  
 } dCYCHHHF  
 return CDialog::PreTranslateMessage(pMsg); Zt -1h{7  
} dBsX*}C  
h[KvhbD3   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7T``-:`[  
{ @r(Z%j7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3:/'t{ ^B  
  SaveBmp(); xVB;s.'!  
  return FALSE; {3a&1'a0g  
} Agh`]XQ2  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 4nfu6Dq  
 CMenu pop; )O+}T5c=  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); lv0nEj8F  
 CMenu*pMenu=pop.GetSubMenu(0); Mk<Vydds  
 pMenu->SetDefaultItem(ID_EXITICON); lLq<xf  
 CPoint pt; .%BT,$1K  
 GetCursorPos(&pt); Mk 0+D#  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8eIUsI.o  
 if(id==ID_EXITICON) i=a-<A5x  
  DeleteIcon(); 2'jOP" G  
 else if(id==ID_EXIT) #qU-j/Qf  
  OnCancel(); gbOpj3  
 return FALSE; DF]9@{  
} E "iUq  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); SEwku}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2Q7R6*<N:  
 AddIcon(); uf<@ruN  
 return res; MvLs%GE%  
} t9 \x%=  
"eWk#/  
void CCaptureDlg::AddIcon()  @4d)R  
{ i!2TH~zl  
 NOTIFYICONDATA data; oeSN9O  
 data.cbSize=sizeof(NOTIFYICONDATA); zQ?!f#f  
 CString tip; 'mCe=Y  
 tip.LoadString(IDS_ICONTIP); 2=0DCF;Bv  
 data.hIcon=GetIcon(0); A,-6|&F  
 data.hWnd=GetSafeHwnd(); UrlM%Jnq1  
 strcpy(data.szTip,tip); S0h'50WteJ  
 data.uCallbackMessage=IDM_SHELL; A , CW_  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f|A riM  
 data.uID=98; 75nNh~?)\  
 Shell_NotifyIcon(NIM_ADD,&data); v`J*ixZ7t  
 ShowWindow(SW_HIDE); Q'l^9Bz  
 bTray=TRUE; zepop19  
} ?SQE5Z  
yw[#  
void CCaptureDlg::DeleteIcon() +cJy._pi!  
{ :a8 YV!X  
 NOTIFYICONDATA data; OV2 -8ERS  
 data.cbSize=sizeof(NOTIFYICONDATA); t- u VZ!`\  
 data.hWnd=GetSafeHwnd(); 'C$XS>S  
 data.uID=98; #1c]PX  
 Shell_NotifyIcon(NIM_DELETE,&data); vr#+0:|  
 ShowWindow(SW_SHOW); -&82$mj  
 SetForegroundWindow(); T J^u"j-'  
 ShowWindow(SW_SHOWNORMAL); dF0,Y?  
 bTray=FALSE; I&?Qq k  
} Xdi:1wW@p  
B!{d-gb  
void CCaptureDlg::OnChange() ~ * :F{  
{ 7g=2Z[o  
 RegisterHotkey(); k$ 5 s{q  
} f:*vr['d  
G)#$]diNuX  
BOOL CCaptureDlg::RegisterHotkey() ZN"j%E{d  
{ LZPuDf~/  
 UpdateData(); f-6vLX\Vu  
 UCHAR mask=0; waX>0e  
 UCHAR key=0; gK#mPcn^  
 if(m_bControl) EcIE~qs  
  mask|=4; t$2_xX  
 if(m_bAlt) K]/4qH$:  
  mask|=2; HCK|~k  
 if(m_bShift) n%h^o   
  mask|=1; V$0dtvGvH  
  key=Key_Table[m_Key.GetCurSel()]; I`[i;U{CK  
 if(bRegistered){ i| \6JpNA:  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); rG?>ltxB  
  bRegistered=FALSE; mOo`ZcTU  
 } pY4}>ju(g  
 cMask=mask; ]&Z))H  
 cKey=key; d@w~[b  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); yJuQ8+vgR}  
 return bRegistered; qQ\Y/}F  
} %6 Q4yk  
3X9b2RY*L/  
  四、小结 b[z]CP  
PFUO8>!pA\  
  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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