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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: ARJtE@s6Y  
  UBuG12U4Y  
  一、实现方法 vMXn#eR  
obX2/   
  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: >^f]Lgp  
;$r!eFY;  
#pragma data_seg("shareddata") s BuXw a  
HHOOK hHook =NULL; //钩子句柄 C0>)WVCK  
UINT nHookCount =0; //挂接的程序数目 p2GN93,u@P  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 <Lle1=qQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 *:chN' <  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey >u `Ci>tY  
static int KeyCount =0; _=qk.|p/  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 nzB!0U  
#pragma data_seg() {X\FS   
%CrpUx  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 61b<6 r0o  
?I.bC   
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 57N<OQWf  
@<1T&X{Z!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR z)&&Ym#  
cKey,UCHAR cMask) 5e'**tbKH  
{ )d5mZE!3  
 BOOL bAdded=FALSE; p AtxEaXh  
 for(int index=0;index<MAX_KEY;index++){ p!(]`N   
  if(hCallWnd[index]==0){ m`,h nDp  
   hCallWnd[index]=hWnd; 7ws[Rp8  
   HotKey[index]=cKey; S.fb[gI]  
   HotKeyMask[index]=cMask; i+Xb3+R  
   bAdded=TRUE; PiX(Ase  
   KeyCount++; z)FGbX  
   break; 1Dm$:),^T}  
  } x1`Jlzrp,  
 } j+3=&PkA.]  
 return bAdded; )5U7w  
} =co6.Il  
//删除热键 38RyUHL=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Or()AzwE@  
{ gn${@y?  
 BOOL bRemoved=FALSE; wo) lkovd  
 for(int index=0;index<MAX_KEY;index++){ _4t  
  if(hCallWnd[index]==hWnd){ Z@#k ivcpz  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ W%}zwQ  
    hCallWnd[index]=NULL; A@G%*\UZ  
    HotKey[index]=0; bO gVC g  
    HotKeyMask[index]=0; GplEad $  
    bRemoved=TRUE; dMH}%f5;1  
    KeyCount--; w 5Yt mnP  
    break; `HM?Fc58  
   } Z uO 7 N  
  } KQrG|<J  
 }  !*-|s}e  
 return bRemoved; vj<JjGP  
} ?7aeY5p  
b U>.Bp]  
v1s0kdR,>  
  DLL中的钩子函数如下: Al}%r85  
WS ^%< h#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xR5zm %\  
{ *h"7!g  
 BOOL bProcessed=FALSE; HS 1zA  
 if(HC_ACTION==nCode) $%3%&+z$I  
 { (yhnv Z  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 s ` +cQ  
   switch(wParam) ]KRw[}z  
   {  H}}C>p"!,  
    case VK_MENU: )Es|EPCx!  
     MaskBits&=~ALTBIT; l>jNBxB|/A  
     break; [Xo[J?w],2  
    case VK_CONTROL: #?RT$L>n  
     MaskBits&=~CTRLBIT; hxuc4C\J  
     break; :pgpE0  
    case VK_SHIFT: &qae+p?  
     MaskBits&=~SHIFTBIT; 8A2_4q@34  
     break; r/mKuGa]  
    default: //judge the key and send message HO9w"){d$  
     break; c`_[q{(^m  
   } nHF%PH#|o  
   for(int index=0;index<MAX_KEY;index++){ W v!%'IB  
    if(hCallWnd[index]==NULL) ]*vv=@"`e  
     continue; VPXUy=W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a}/ A]mu  
    { di]TS9&9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #\$AB_[ot>  
     bProcessed=TRUE; 6Y&`mgMF'  
    } P jh3=Dr  
   } 5Z*6,P0  
  } y` 6!Vj l  
  else if((lParam&0xc000ffff)==1){ //有键按下 {:c5/ ,7c;  
   switch(wParam) BBlYy5x  
   { m e&'BQ  
    case VK_MENU: {Z(kzJwN  
     MaskBits|=ALTBIT; :c`Gh< u  
     break; vAjvW&'g  
    case VK_CONTROL: O p,_d^  
     MaskBits|=CTRLBIT; xh9Os <  
     break; q!\4|KF~  
    case VK_SHIFT: ])NQzgS  
     MaskBits|=SHIFTBIT; R>n=_C  
     break; qv.s-@l8  
    default: //judge the key and send message p5\B0G<m  
     break; d\v1R-V  
   } :"I!$_E'  
   for(int index=0;index<MAX_KEY;index++){ yJ?S7+b  
    if(hCallWnd[index]==NULL) TnQ"c)ta  
     continue; |kh7F0';"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0 pPSg9  
    { ;dZuO[4\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); B 42t  
     bProcessed=TRUE; B0|!s  
    } E]dmXH8A  
   } oA]rwa UX  
  } aV`_@F-8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 g=]VQ;{  
   for(int index=0;index<MAX_KEY;index++){ VH7nyqEM  
    if(hCallWnd[index]==NULL) ![9um sx  
     continue; V3<H8pL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) CWw#0  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); b ]u01T-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2nkymEPu  
   } $u P'>  
  } db`L0JB  
 } XsbYWJdds  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =a^}]k}  
} :.aMhyh#*  
p;n"zr8U  
  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: 2v?fbrC5c  
 {Bw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JK'FJ}Z4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l~Rd\.O  
yr/G1?k%ML  
  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: X)b@ia'"Wp  
7B{LRm6;Vu  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2R];Pv  
{ 8(ej]9RObU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) lgQ"K(zY  
 { |Q+:vb:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 '|^x[8^  
  SaveBmp(); B nUWg ^E  
  return FALSE; ^Fpc8D,  
 } Bht!+  
 …… //其它处理及默认处理 WJj5dqatV  
} -+{<a!Nb  
U'k 0;  
(5a:O (\r  
  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。 dTZ$92<  
!QS j*)V#  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ^xm%~   
Mqv[7.|  
  二、编程步骤 cp$GP*{@  
"Tz'j}< 9C  
  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"; Fj4>)!^kM  
:T )R;E@  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; WT63ve  
a(uZ}yS$  
  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; V@rqC[on  
->L>`<7(  
  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; A~}5T%qb  
]p!)8[<  
  5、 添加代码,编译运行程序。 QTC!vKM  
a'Yi^;2+\  
三、程序代码 %z~=Jz^  
,0a\Ka {^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ( 4(,"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 7!Qu+R  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Z0%:j\W4c  
#if _MSC_VER > 1000 4i7+'F  
#pragma once qWM+!f  
#endif // _MSC_VER > 1000 5Mz:$5Tm  
#ifndef __AFXWIN_H__ N@0cn q:"  
#error include 'stdafx.h' before including this file for PCH ny1;]_X_  
#endif pZz\o  
#include "resource.h" // main symbols _;M3=MTM9  
class CHookApp : public CWinApp ,pIh.sk7s*  
{ vb6kr?-i*  
 public: i&YWutG  
  CHookApp(); l"-Z#[  
  // Overrides o$Ju\(Y$<+  
  // ClassWizard generated virtual function overrides m~0Kos%^*b  
  //{{AFX_VIRTUAL(CHookApp) Z C<+BKS  
 public: G>Hg0u0!,  
  virtual BOOL InitInstance(); $b(CN+#  
  virtual int ExitInstance(); Z@(KZ|  
  //}}AFX_VIRTUAL g%<n9AUl  
  //{{AFX_MSG(CHookApp) ]f_`w81[  
  // NOTE - the ClassWizard will add and remove member functions here. !_P&SmK3  
  // DO NOT EDIT what you see in these blocks of generated code ! ;SIWWuk  
  //}}AFX_MSG eG7Yyz+t$  
  DECLARE_MESSAGE_MAP() Y>6N2&Q  
}; )2a)$qx;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]I_*+^?tI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S$ffTdRz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :V1j*)  
BOOL InitHotkey(); tI)|y?q  
BOOL UnInit(); .cm2L,1h  
#endif "VDMO^  
m?kyAW'|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Dxy^r*B  
#include "stdafx.h" y @S_CB 47  
#include "hook.h" iX[g  
#include <windowsx.h> MU%7'J :_  
#ifdef _DEBUG <RKT |  
#define new DEBUG_NEW "}V_.I* +  
#undef THIS_FILE IC?(F]$%>  
static char THIS_FILE[] = __FILE__; u*/+cT  
#endif uP+VS>b  
#define MAX_KEY 100 PMUW<UI  
#define CTRLBIT 0x04 *YSRZvD<\  
#define ALTBIT 0x02 |nE4tN#J<  
#define SHIFTBIT 0x01 jD${ZIv  
#pragma data_seg("shareddata") SA7(EJ95  
HHOOK hHook =NULL; `/^ _W <  
UINT nHookCount =0; M*f]d`B  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4(p`xdr}K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT s VHk;:e>x  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey n*Uk<_WA  
static int KeyCount =0; .G#li(NWH  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift hD=.rDvO  
#pragma data_seg() bF6J>&]!  
HINSTANCE hins; }wkY`"  
void VerifyWindow(); <v'&Pk<  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) FWA?mde  
//{{AFX_MSG_MAP(CHookApp) ]IEZ?+F,  
// NOTE - the ClassWizard will add and remove mapping macros here. <z\`Ma  
// DO NOT EDIT what you see in these blocks of generated code! ?U{<g,^  
//}}AFX_MSG_MAP ^GyZycch  
END_MESSAGE_MAP() 2,wwI<=E'  
N<1+aL\  
CHookApp::CHookApp() BM'!odRv  
{ 2?SbkU/3|P  
 // TODO: add construction code here, hGkJ$QT  
 // Place all significant initialization in InitInstance kRc+OsY9  
} xx(C$wCJ  
=J4|"z:  
CHookApp theApp; 1X&.po  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fbU3-L?  
{ k%FA:ms|k  
 BOOL bProcessed=FALSE; GX0zirz  
 if(HC_ACTION==nCode) s M*ay,v;  
 { M(zZ8#  
  if((lParam&0xc0000000)==0xc0000000){// Key up Z XGi> E  
   switch(wParam) xP!QV~$>  
   { r *]pL<  
    case VK_MENU: eIfQ TV  
     MaskBits&=~ALTBIT; U8AH,?]#  
     break; QeG9CS)E}j  
    case VK_CONTROL: |?s sHW  
     MaskBits&=~CTRLBIT; HC/z3b;  
     break; !3Pbu=(cte  
    case VK_SHIFT: !Av9 ?Q:  
     MaskBits&=~SHIFTBIT; U(9_&sL  
     break; ^:]$m;v]  
    default: //judge the key and send message p |1u,N  
     break; h='F,r5#2  
   } t`&x.o  
   for(int index=0;index<MAX_KEY;index++){ 8lL|j  
    if(hCallWnd[index]==NULL) tKeTHj;jO  
     continue; q;")  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uINdeq7|F  
    { C!a1.&HHZ7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9&5<ZC-D  
     bProcessed=TRUE; ".tL+A[  
    } Ff%V1BH[  
   } -X~mW  
  } Cf3!Ud  
  else if((lParam&0xc000ffff)==1){ //Key down qS2Nk.e]o  
   switch(wParam) i*Ldec^  
   { KGHSEZi]  
    case VK_MENU: P=5+I+  
     MaskBits|=ALTBIT; ANy*'/f  
     break; GD{L$#i!  
    case VK_CONTROL: NOuG#P  
     MaskBits|=CTRLBIT; L]|mWyzT  
     break;  7P7OTN  
    case VK_SHIFT: EP 4]#]5  
     MaskBits|=SHIFTBIT; {@^;Nw%J  
     break; B+j]C$8}  
    default: //judge the key and send message Z(T{K\)uN  
     break; RHg-Cg`  
   } J6AHc"k.  
   for(int index=0;index<MAX_KEY;index++) `(sb  
   { [YfoQ1  
    if(hCallWnd[index]==NULL) N);w~)MYh  
     continue; ~DI$O[KpR%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :Iv;%a0 -  
    { UnF8#~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "(^XZAU#W  
     bProcessed=TRUE; (Z SaAn),  
    } "|L" C+tE  
   } lGl'A}]#$  
  } &~ y)b`r  
  if(!bProcessed){ cKe%P|8  
   for(int index=0;index<MAX_KEY;index++){ C/Khp +  
    if(hCallWnd[index]==NULL) )ODF6Ag  
     continue; ]~KLdgru_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _XV%}Xb'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); GWnIy6TH l  
   } zKO7`.*  
  } LdV&G/G-#D  
 } S{rltT-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rP3HR 5  
} $/++afi m  
_`|1B$@x  
BOOL InitHotkey() d]pb1ECuu  
{ (~=.[Y  
 if(hHook!=NULL){ En?V\|,  
  nHookCount++; xzm]v9k&  
  return TRUE; z%%O-1   
 } !hBpon  
 else jO-?t9^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); bf"'xn9  
  if(hHook!=NULL) i#]e&Bru5  
   nHookCount++; mm-s?+&M;  
  return (hHook!=NULL); 6lSz/V;  
} G^~[|a 4`  
BOOL UnInit() sUZA!sv  
{ EiL#Dwx  
 if(nHookCount>1){  5&&4-  
  nHookCount--; 2J ZR"P  
  return TRUE; 0 =j }`  
 } lW&(dn)}  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ~#A}=, 4>  
 if(unhooked==TRUE){ +jGHR& A t  
  nHookCount=0; Z<-_Y]4j  
  hHook=NULL; %9J@##+  
 } {AL EK   
 return unhooked; |h>PUt@LL  
} \k.`xG?  
?Z7`TnG$uf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n|w+08c"  
{ jwDlz.sW!  
 BOOL bAdded=FALSE; 9-KhJq%  
 for(int index=0;index<MAX_KEY;index++){ }}AIpYp,P  
  if(hCallWnd[index]==0){ ,c p2Fac  
   hCallWnd[index]=hWnd; FzT.9Vz7  
   HotKey[index]=cKey; U(#<D7}  
   HotKeyMask[index]=cMask; py*22Ua^  
   bAdded=TRUE; `>gG"1,]  
   KeyCount++;  wA"@t  
   break; !Zz;;Z  
  } $MQ}+*Wr  
 } zX>W 8P  
 return bAdded; Z!1D4`w  
} 1- KNXGb'  
KA5)]UF`l  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) gg'1q3OjM  
{ ~VGnE:  
 BOOL bRemoved=FALSE; kQ`tY`3F  
 for(int index=0;index<MAX_KEY;index++){ 'cW^S7  
  if(hCallWnd[index]==hWnd){ -@W9+Zf5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,fkvvM{mq  
    hCallWnd[index]=NULL; Td=4V,BN  
    HotKey[index]=0; ^\\3bW9}H  
    HotKeyMask[index]=0; )h{&O ,s  
    bRemoved=TRUE; )`\hK  
    KeyCount--; xY^sC56Z  
    break; 25Dl4<-Z  
   } ~M C|  
  } k ut=( ;  
 } ZZw`8 E  
 return bRemoved; :xh{SsW@  
} {Su?*M2y  
i"2OsGT  
void VerifyWindow() e7vm3<m4  
{ ejROJXB  
 for(int i=0;i<MAX_KEY;i++){ ALF0d|>=uj  
  if(hCallWnd!=NULL){ /WrB>w  
   if(!IsWindow(hCallWnd)){ f98,2I(>`+  
    hCallWnd=NULL; |3*9+4]a  
    HotKey=0; jjs/6sSRk  
    HotKeyMask=0; z;c>Q\Q  
    KeyCount--; b$G{^  
   } FaL\6w  
  } 1 ^~&"s U  
 } j]Auun  
} o>el"0rn.h  
z5+Pi:1w  
BOOL CHookApp::InitInstance() +HK4sA2;  
{ 'solCAy  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Q#bW"},^k  
 hins=AfxGetInstanceHandle(); 9mF '   
 InitHotkey(); K`4rUEf}V"  
 return CWinApp::InitInstance(); (!~cO x   
} S* h52li  
h3ygL"k  
int CHookApp::ExitInstance() jh5QIZf=  
{ NVyBEAoh  
 VerifyWindow(); w_9^YO! !  
 UnInit(); C"hN2Z!CD|  
 return CWinApp::ExitInstance(); @KN+)qP  
} #lYyL`B+~  
6EqA Y`y  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file TBj2(Z  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) X8Z?G,[H  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ cG|fau<G  
#if _MSC_VER > 1000 U( YAI%O  
#pragma once +&GV-z~o  
#endif // _MSC_VER > 1000 #NS|9jW  
6x+ujUBkK  
class CCaptureDlg : public CDialog i_Kwxn$  
{ iSW2I~PD  
 // Construction d t/AAk6  
 public: 0YH5B5b  
  BOOL bTray; =7Ln&tZ  
  BOOL bRegistered; }0'=}BE  
  BOOL RegisterHotkey(); 3]Z1kB  
  UCHAR cKey; u?osX;'w  
  UCHAR cMask; L\:|95Yq  
  void DeleteIcon(); VUb>{&F[  
  void AddIcon(); q6zVu(  
  UINT nCount; 7CIN!vrC|1  
  void SaveBmp(); /x VHd  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor @CprC]X  
  // Dialog Data aukcO ;oG<  
  //{{AFX_DATA(CCaptureDlg) -IPo/?}  
  enum { IDD = IDD_CAPTURE_DIALOG }; <r%K i`u(p  
  CComboBox m_Key; +;N]34>S7  
  BOOL m_bControl; LGP"S5V  
  BOOL m_bAlt; r $7.  
  BOOL m_bShift; &D, Iwq  
  CString m_Path; d?,'$$aB  
  CString m_Number; xc^@"  
  //}}AFX_DATA asWk]jjMG  
  // ClassWizard generated virtual function overrides 222 Y?3>@D  
  //{{AFX_VIRTUAL(CCaptureDlg) : 4ryi&Y  
 public: }:Z.g  
  virtual BOOL PreTranslateMessage(MSG* pMsg); M'*s5:i  
 protected: *ap,r&]#F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (q)}`1d'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7]=&Q4e4  
  //}}AFX_VIRTUAL z.vQ1~s  
  // Implementation C@(@n!o:!  
 protected: Z 3BwbH  
  HICON m_hIcon; z@*E=B1L  
  // Generated message map functions Kv_2=]H  
  //{{AFX_MSG(CCaptureDlg) `Os=cMR  
  virtual BOOL OnInitDialog(); bI):-2&s}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wu <0or2  
  afx_msg void OnPaint(); i:lc]B  
  afx_msg HCURSOR OnQueryDragIcon(); 0PzSp ]  
  virtual void OnCancel(); qu=~\t1[6  
  afx_msg void OnAbout(); Jo?LPR \6  
  afx_msg void OnBrowse(); ^q7V%{54  
  afx_msg void OnChange(); p`tz*ewC  
 //}}AFX_MSG %~rEJB@{  
 DECLARE_MESSAGE_MAP() 3CCs_AO  
}; ah>c)1DA*H  
#endif \)PB p  
v{u3[c   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Z8v\>@?5R  
#include "stdafx.h" c&['T+X  
#include "Capture.h" ]'.qRTz'\t  
#include "CaptureDlg.h" \CB^9-V3  
#include <windowsx.h> !np_B0`  
#pragma comment(lib,"hook.lib") |t,sK aL  
#ifdef _DEBUG $BqiC!~  
#define new DEBUG_NEW (tK_(gO  
#undef THIS_FILE Sd+5Uf `  
static char THIS_FILE[] = __FILE__; qv!(In>u  
#endif K #3^GB3P  
#define IDM_SHELL WM_USER+1 :1'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L+t / E`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]U?nYppV  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; T(!1\TB  
class CAboutDlg : public CDialog *zrT;j G  
{ m&)/>'W   
 public: rH}|~  
  CAboutDlg(); $LP(\T([  
  // Dialog Data {^]qaQ[5N  
  //{{AFX_DATA(CAboutDlg) UZdnsG7  
  enum { IDD = IDD_ABOUTBOX }; hf`y_H+\7  
  //}}AFX_DATA V@'Xj .ze  
  // ClassWizard generated virtual function overrides l@`k:?  
  //{{AFX_VIRTUAL(CAboutDlg) di\.*7l?  
 protected: }7PJr/IuF  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;,y_^-h;  
  //}}AFX_VIRTUAL ,Ag{-&  
  // Implementation hY)zKX_r  
 protected: Q2CGC+   
  //{{AFX_MSG(CAboutDlg) d59rq<yI  
  //}}AFX_MSG D#GuF~-F!R  
  DECLARE_MESSAGE_MAP() g#S X$k-O  
}; E|=x+M1sH  
gS(3m_  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) CL<-3y*  
{ GSA+A7sZ  
 //{{AFX_DATA_INIT(CAboutDlg) -J v,#Z3  
 //}}AFX_DATA_INIT s_^`t+5  
} |d0X1(  
=dXHQU&Q  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )nd^@G^  
{ vJE=H9E  
 CDialog::DoDataExchange(pDX); Bg|d2,im  
 //{{AFX_DATA_MAP(CAboutDlg) FSuC)Xg  
 //}}AFX_DATA_MAP Fe8X@63  
} 3M#x)cW  
 ^B"LT>.[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }T_"Vg q  
 //{{AFX_MSG_MAP(CAboutDlg) W ?x~"-*  
 // No message handlers fh#:j[R4e  
 //}}AFX_MSG_MAP yQJ0",w3o.  
END_MESSAGE_MAP() V_i&@<J  
`E~"T0RX  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y3@+aA  
: CDialog(CCaptureDlg::IDD, pParent) 0fc;H}B*  
{ lDS y$  
 //{{AFX_DATA_INIT(CCaptureDlg) LWrYK i  
  m_bControl = FALSE; ("`"?G  
  m_bAlt = FALSE; d=1\=d/K  
  m_bShift = FALSE; O>E}Lu;|  
  m_Path = _T("c:\\"); {-)^?Zb @  
  m_Number = _T("0 picture captured."); Csyh 'v  
  nCount=0; 6;E3|st1X  
  bRegistered=FALSE; ,Uh^e]pC  
  bTray=FALSE; +9/K|SB{ $  
 //}}AFX_DATA_INIT  l!1_~!{y  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6AIqoX*p  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); y[J9"k(@  
} XT/t\\Z`U  
lhM5a \  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) S @[]znH  
{ % J\G[dl  
 CDialog::DoDataExchange(pDX); W@!qp  
 //{{AFX_DATA_MAP(CCaptureDlg) =8_b&4.:&  
  DDX_Control(pDX, IDC_KEY, m_Key); QRQ{Bq}#  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); gY+d[3N  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ?;#Q3Y+  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); `yR/M"u6T  
  DDX_Text(pDX, IDC_PATH, m_Path); ;X}2S!7Ko  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1_7p`Gxt[/  
 //}}AFX_DATA_MAP 2K4Xu9-i:b  
} kB+$Kt<]L  
+B{u,xgg  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) oVK?lQ~y  
//{{AFX_MSG_MAP(CCaptureDlg) +*OAClt+]  
 ON_WM_SYSCOMMAND() z/#,L!Z3  
 ON_WM_PAINT() Le83[E*i  
 ON_WM_QUERYDRAGICON() 0 Rb3| te  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) WOPIF~1v  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) , S^y>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #-%D(=&I  
//}}AFX_MSG_MAP M|nLD+d~8  
END_MESSAGE_MAP() YM#' +wl}`  
"s@Hg1  
BOOL CCaptureDlg::OnInitDialog() "= 2\kZ  
{ 27}:f?2hbJ  
 CDialog::OnInitDialog(); ?* ~4~ZE E  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (YJ2- X~  
 ASSERT(IDM_ABOUTBOX < 0xF000); H2iIBGu|L  
 CMenu* pSysMenu = GetSystemMenu(FALSE); k8G4CFg}wP  
 if (pSysMenu != NULL) oW OR7)?r  
 { !I|_vJ@<  
  CString strAboutMenu; ; FI'nL  
  strAboutMenu.LoadString(IDS_ABOUTBOX); HRTNIx  
  if (!strAboutMenu.IsEmpty()) Qfp4}a=  
  { ^5Y<evjm  
   pSysMenu->AppendMenu(MF_SEPARATOR); .joCZKO  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;nlJ D#  
  } ZXLAX9|  
 } 6Takx%U  
 SetIcon(m_hIcon, TRUE); // Set big icon F=&,=r' Q8  
 SetIcon(m_hIcon, FALSE); // Set small icon v1u~[c=|^  
 m_Key.SetCurSel(0); H-t$A, [  
 RegisterHotkey(); sct 3|H#  
 CMenu* pMenu=GetSystemMenu(FALSE); -Tvnd,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); |Ja5O  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); qo:Zc`t(R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {^ BZ#)m|  
 return TRUE; // return TRUE unless you set the focus to a control zEjl@Kf  
} */~|IbZ`o  
[#wt3<d`)  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 'h ?  
{ /@Jg [na  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^G qO>1U  
 { xqdkc^b  
  CAboutDlg dlgAbout; ?Kmz urG  
  dlgAbout.DoModal(); NI/'SMj%  
 } _G`Q2hf"5  
 else wg_Z@iX  
 { #++:`Z  
  CDialog::OnSysCommand(nID, lParam); ;+DMv5A "  
 } u;%~P 9O  
} 0rX%z$D+@  
;7[DFlS\P  
void CCaptureDlg::OnPaint() .`*;AT  
{ }2Ge??!  
 if (IsIconic()) DI/d(oFv`  
 { J<NpA(@^  
  CPaintDC dc(this); // device context for painting ZT"vVX- )G  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); o^5UHFxTCB  
  // Center icon in client rectangle g[y&GCKY!=  
  int cxIcon = GetSystemMetrics(SM_CXICON); Ce//; Op  
  int cyIcon = GetSystemMetrics(SM_CYICON); @@a#DjE%/  
  CRect rect; f:nXE&X[  
  GetClientRect(&rect); UQhD8Z'I.  
  int x = (rect.Width() - cxIcon + 1) / 2; b4$g$()  
  int y = (rect.Height() - cyIcon + 1) / 2; 1A93ol=  
  // Draw the icon MF$Dx| Tcj  
  dc.DrawIcon(x, y, m_hIcon); <bn|ni|c"  
 } 7aRy])x  
 else ;Ym6ey0t  
 {  Z a,o  
  CDialog::OnPaint(); 0(C[][a*u  
 } (gdzgLHy  
} UQI!/6F  
/:-ig .YY  
HCURSOR CCaptureDlg::OnQueryDragIcon() ]=3hH+1 a  
{ C(sz/x?11  
 return (HCURSOR) m_hIcon; &]f8Xd  
} j0F& WKk  
I(>_as\1  
void CCaptureDlg::OnCancel() ]c\`EHN  
{ Hl}m*9<9us  
 if(bTray) g \+!+!"~  
  DeleteIcon(); 7h. [eMLPB  
  CDialog::OnCancel(); iyR5mA  
} g}?39?o4  
8eCh5*_$  
void CCaptureDlg::OnAbout() sj+ )   
{ H>\l E2  
 CAboutDlg dlg; SXXO#  
 dlg.DoModal(); \HMuV g'Q  
} pcd?6jh8  
V[8!ymi0  
void CCaptureDlg::OnBrowse() .K_50 %s  
{ Y3V2}  
 CString str; +CQIm!Sp  
 BROWSEINFO bi; g5nL7;`N  
 char name[MAX_PATH]; Vs>e"czfm/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); EE9eG31|r  
 bi.hwndOwner=GetSafeHwnd(); ?+c-m+;wj  
 bi.pszDisplayName=name; 3nq4Y'  
 bi.lpszTitle="Select folder"; @Us#c 7/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Sw{rNzh%$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); C:!&g~{cKi  
 if(idl==NULL) fX LsLh+~D  
  return; aTaL|&(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); I]#x0?D  
 str.ReleaseBuffer(); IQ JFL +f  
 m_Path=str; GB*^?Ii  
 if(str.GetAt(str.GetLength()-1)!='\\') !bW^G} <t  
  m_Path+="\\"; W9GjUswv!  
 UpdateData(FALSE); 3;//o<  
} P=ubCS'  
*EU1`q*  
void CCaptureDlg::SaveBmp() `y"a>gHC  
{ 3!KyO)8  
 CDC dc; *TL3-S?   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); So NgDFD  
 CBitmap bm; wG 5H^>6u>  
 int Width=GetSystemMetrics(SM_CXSCREEN); |>JRJ"CFE  
 int Height=GetSystemMetrics(SM_CYSCREEN); E0A[{UA   
 bm.CreateCompatibleBitmap(&dc,Width,Height); -t*P=V|@  
 CDC tdc; O/l/$pe  
 tdc.CreateCompatibleDC(&dc); h?QGJ^#8  
 CBitmap*pOld=tdc.SelectObject(&bm); #E/|W T  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); +D h?MQt?  
 tdc.SelectObject(pOld); =4/K#cQ  
 BITMAP btm; %u?A>$Jn  
 bm.GetBitmap(&btm); P?=}}DI  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;MO,HdP;  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =EHKu|rX~  
 BITMAPINFOHEADER bih; P!R`b9_U  
 bih.biBitCount=btm.bmBitsPixel; H/0b3I^  
 bih.biClrImportant=0; |i(@1 l  
 bih.biClrUsed=0; bM,%+9oz;  
 bih.biCompression=0; Z%{`j!!p  
 bih.biHeight=btm.bmHeight; [Z[ p@Ux  
 bih.biPlanes=1; 3|Y.+W  
 bih.biSize=sizeof(BITMAPINFOHEADER); ;%/}(&E2  
 bih.biSizeImage=size; ;0dl  
 bih.biWidth=btm.bmWidth; Jk`0yJi$q  
 bih.biXPelsPerMeter=0; Qj9'VI>&  
 bih.biYPelsPerMeter=0; SG)|4$"  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); tv9 R$-cJ  
 static int filecount=0; n}J!?zZc  
 CString name; ur+\!y7^R  
 name.Format("pict%04d.bmp",filecount++); ad<ZdO*h  
 name=m_Path+name; Xq$9H@.  
 BITMAPFILEHEADER bfh; D'Kiy  
 bfh.bfReserved1=bfh.bfReserved2=0; ;k=`J  
 bfh.bfType=((WORD)('M'<< 8)|'B'); !imjfkG  
 bfh.bfSize=54+size; q$B|a5a?  
 bfh.bfOffBits=54; a/~1CrYr  
 CFile bf; 2Gc0pBqx  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ RbEtNwG@c  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); na|23jz4  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); K!tM "`a  
  bf.WriteHuge(lpData,size); 5BMrn0  
  bf.Close(); ;C5 J ^xHI  
  nCount++; ](k}B*Ab h  
 } kI~; 'M  
 GlobalFreePtr(lpData); kznm$2 b  
 if(nCount==1) mN" g~o*  
  m_Number.Format("%d picture captured.",nCount); o|1_I?_  
 else nsXyReWka  
  m_Number.Format("%d pictures captured.",nCount); n?NUnFA  
  UpdateData(FALSE);  )jH|j  
} %bB:I1V\  
~T\:".C  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :w9s bW  
{ 9d+z?J:  
 if(pMsg -> message == WM_KEYDOWN) E>1%7" i<  
 { hhJ>>G4R2  
  if(pMsg -> wParam == VK_ESCAPE)  :D  
   return TRUE; ^}Gu'!z9D  
  if(pMsg -> wParam == VK_RETURN) $mst\]&;  
   return TRUE; Wl{}>F`W[  
 } sWMY Lo  
 return CDialog::PreTranslateMessage(pMsg); )#Id=c  
} Uclta  
_^NL{R/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) e~G um  
{ 6 $5SS#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 03 I*@jj  
  SaveBmp(); pq*4yaTT'  
  return FALSE; 9{R88f?;  
} (+.R8  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {xQ(xy  
 CMenu pop; "tU,.U  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); *qw//W   
 CMenu*pMenu=pop.GetSubMenu(0); bP1]:^ x@W  
 pMenu->SetDefaultItem(ID_EXITICON); ?_@Mg\Hc  
 CPoint pt; QjFE  
 GetCursorPos(&pt); CQET  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 82w=t  
 if(id==ID_EXITICON) $+w-r#,  
  DeleteIcon(); fsV_>5I6  
 else if(id==ID_EXIT) q4KYC!b  
  OnCancel(); Z:<6Ck  
 return FALSE; NfXEW-  
} oedLe9!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Si=u=FI1e  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [_3L  
 AddIcon(); f5vsxP)Y[  
 return res; X/<Q3AK  
} ?`=r@  
F'JceU  
void CCaptureDlg::AddIcon() )uH#+IU  
{ Q|nGY:98  
 NOTIFYICONDATA data; hv9k9i7@l  
 data.cbSize=sizeof(NOTIFYICONDATA); f26hB;n  
 CString tip; Jrw R:_+|  
 tip.LoadString(IDS_ICONTIP); y (=$z/  
 data.hIcon=GetIcon(0); E3 aj  
 data.hWnd=GetSafeHwnd(); m 3"|$0C~  
 strcpy(data.szTip,tip); Tf.DFfV#y  
 data.uCallbackMessage=IDM_SHELL; Yi#U~ h  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; M>|R&v  
 data.uID=98; McRfEF \  
 Shell_NotifyIcon(NIM_ADD,&data); ~|=goHmm[  
 ShowWindow(SW_HIDE); @x/D8HK2  
 bTray=TRUE; L%0G >2x  
} Hge0$6l  
hH=}<@z   
void CCaptureDlg::DeleteIcon() qku!Mg  
{ @SH$QUM(  
 NOTIFYICONDATA data; 7\ kixfEg  
 data.cbSize=sizeof(NOTIFYICONDATA); 7G &I]>  
 data.hWnd=GetSafeHwnd(); @LR:^>&*  
 data.uID=98; ^ub@ Jwe  
 Shell_NotifyIcon(NIM_DELETE,&data); K|sx"u|?  
 ShowWindow(SW_SHOW); sB%QqFRP  
 SetForegroundWindow(); vuNq7V*}  
 ShowWindow(SW_SHOWNORMAL); tF~D!t@  
 bTray=FALSE; o_on/{qz  
} {_>}K  
.WT ar9e#  
void CCaptureDlg::OnChange() 4{Af 3N  
{ (z.eXoP@>  
 RegisterHotkey(); ibQN pIz  
} M%qHf{ B  
n8'#'^|  
BOOL CCaptureDlg::RegisterHotkey() I?Ct@yxhF'  
{ b=Oec%Adx  
 UpdateData(); }ujl2uhM  
 UCHAR mask=0; /}#@uC  
 UCHAR key=0; -)$5[jM]  
 if(m_bControl) )~H&YINhn  
  mask|=4; #Bi8>S  
 if(m_bAlt) B0"55g*c  
  mask|=2;  nypG  
 if(m_bShift) 0XUWK@)P  
  mask|=1; y6N }R  
  key=Key_Table[m_Key.GetCurSel()]; hSF4-Vvb  
 if(bRegistered){ clO9l=g  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); h!q_''*;  
  bRegistered=FALSE; $ {5|{`  
 } !ui:0_  
 cMask=mask; IO}53zn<l  
 cKey=key; ><3!J+<?  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D:vX/mf;7  
 return bRegistered; ~mK|~x01@  
} 9 Aq\1QC  
$I:&5o i  
  四、小结 Y>To k|PV  
_"688u'88  
  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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