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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: j#l=%H  
  m=dNJF  
  一、实现方法 z 6:Wh  
fF@w:;u  
  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: sh<Q2X  
a>wCBkD  
#pragma data_seg("shareddata") 1[%3kY-h  
HHOOK hHook =NULL; //钩子句柄 =8AT[.Hh  
UINT nHookCount =0; //挂接的程序数目 &N~Eu-@b  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 =)a24PDG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3_(_yEKx  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey NXW*{b  
static int KeyCount =0; I'/3_AX  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 n6/Ous  
#pragma data_seg() \TQZZ_Z  
L)e" qC_-  
  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。 P`Np +E#I  
bZqTT~'T  
  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: /0s1;?  
osW"wh_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ['d9sEv.  
cKey,UCHAR cMask) ;tOs A #  
{ RRL{a6(?  
 BOOL bAdded=FALSE; VY?9|};f  
 for(int index=0;index<MAX_KEY;index++){ ++cS^ Lo  
  if(hCallWnd[index]==0){ -+R,="nRQ  
   hCallWnd[index]=hWnd; NR4+&d  
   HotKey[index]=cKey; /bo}I-<2  
   HotKeyMask[index]=cMask; ,}oAc  
   bAdded=TRUE; 1"h"(dA  
   KeyCount++; +|A`~\@N  
   break; C:QB=?%;  
  } (b&g4$!x&5  
 } #:K=zV\  
 return bAdded; G|6qL  
} BWt`l,nF  
//删除热键 mZ)>^.N6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V9c.(QY|f  
{ ,AP&N'  
 BOOL bRemoved=FALSE; 6^`iuC5  
 for(int index=0;index<MAX_KEY;index++){ [vg&E )V  
  if(hCallWnd[index]==hWnd){ .#[ 9q-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .-gJS-.c  
    hCallWnd[index]=NULL; HsY5wC  
    HotKey[index]=0; 4~fYG|a  
    HotKeyMask[index]=0; `7 "="T~ *  
    bRemoved=TRUE; *z0!=>(  
    KeyCount--; S?~0)EXj(  
    break; Qqm?%7A1  
   } $dC`keQM>9  
  } ,H=k5WA4m  
 } F}; R  
 return bRemoved; (0-Ol9[  
} ug3\K83aj/  
Q}BMvR 9w  
\&"C  
  DLL中的钩子函数如下: !~#zd]0x;  
c 1YDln  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) L2H  
{ #GzALF97  
 BOOL bProcessed=FALSE; d |17G  
 if(HC_ACTION==nCode) ( bwD:G9  
 { `v*HH}aDO  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 0 QTI;3  
   switch(wParam) R1];P*>%gZ  
   {  "\4W])30  
    case VK_MENU: O8]e(i  
     MaskBits&=~ALTBIT; 80lei  
     break; |{9<%Ok4P  
    case VK_CONTROL: ?=1eHnP!R  
     MaskBits&=~CTRLBIT; l=?e0d>O  
     break; " U\RN  
    case VK_SHIFT: adLL7  
     MaskBits&=~SHIFTBIT; JR!-1tnc  
     break; )Q2IYCj{  
    default: //judge the key and send message 5kGniG?T#  
     break; sN41Bz$q.  
   } z; GQnAG@  
   for(int index=0;index<MAX_KEY;index++){ VN`.*B|9[  
    if(hCallWnd[index]==NULL) (/:m*x*6  
     continue; ifD WN*k6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) '1mk;%  
    { ] Lv3XMa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); / VYT](  
     bProcessed=TRUE; ^r~[ 3NT  
    } OZ&/&?!XE  
   } X1#Ar)  
  } (*S<2HN5  
  else if((lParam&0xc000ffff)==1){ //有键按下 $Q*R/MY  
   switch(wParam) q?!HzZ  
   { }0'LKwIR  
    case VK_MENU: j iKHx_9P  
     MaskBits|=ALTBIT; H^d?(Svh  
     break; D{(}&8a9  
    case VK_CONTROL: &5W;E+Pub  
     MaskBits|=CTRLBIT; En\@d@j<u  
     break; e,%|sAs[  
    case VK_SHIFT: _dKMBcl)E  
     MaskBits|=SHIFTBIT; Ohm{m^VD"  
     break; XvI~"}  
    default: //judge the key and send message orjtwF>^  
     break; OxHcoNrz  
   } o `YBz~2  
   for(int index=0;index<MAX_KEY;index++){ TiD#t+g  
    if(hCallWnd[index]==NULL) 5*44QV  
     continue; 6 byeO&d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7O55mc>cF  
    { ^yW['H6V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mG~k f]Y  
     bProcessed=TRUE; J 8 KiL  
    } gX" -3w  
   } 71{Q#%5U~  
  } |]G%b[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,C,nNaW  
   for(int index=0;index<MAX_KEY;index++){ "z9C@T  
    if(hCallWnd[index]==NULL) v]EMJm6d|  
     continue; C3'xU`=7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) t oGiG|L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /9br&s$B  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ar<5UnT  
   } t?"(Zb  
  } r^5%0_F]  
 } Y%;J/4dd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |OeWM  
} f#z:ILG=  
s4fO4.bnm  
  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: )Fx]LeI;  
Ph yIea  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _:[@zxT<x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C:J frg`  
O50_qu33ju  
  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: @)d_zWE  
&dtst??  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p3vf7eqn  
{ 8&U Mmbgy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) K 4GuOl  
 { *H!BThft4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ].s;Yxz  
  SaveBmp(); x3i}IC  
  return FALSE; N>(w+h+  
 } U~D~C~\2;  
 …… //其它处理及默认处理 SMrfEmdH+  
} Cn/WNCzst&  
~B|m"qY{i  
@<P2di  
  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。 ,NQ!d4 ~D  
t#"0^$l=  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ^2- <XD)  
Wxj_DTi[1"  
  二、编程步骤 ~vA{I%z5~  
E !ndXz 59  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; *b>RUESF  
\96\!7$@O  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ": vGs_$  
bB?E(>N;  
  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; ]L~NYe9  
(ODwdN7;  
  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; Aax;0qGbH  
Hk*1Wrs*  
  5、 添加代码,编译运行程序。 zjA]Tr  
YH\9Je%jx  
三、程序代码 4`i8m  
8;?4rrS  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL bg Ux&3  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) U5kKT.M  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5hmfdj6  
#if _MSC_VER > 1000 DURWE,W>  
#pragma once -8^qtB  
#endif // _MSC_VER > 1000  p?f\/  
#ifndef __AFXWIN_H__ ,40OCd!  
#error include 'stdafx.h' before including this file for PCH Y5tyFi#w[  
#endif '$OUe {j<  
#include "resource.h" // main symbols [XY%<P3D  
class CHookApp : public CWinApp *:yG)J 3F  
{ / :F^*]  
 public: ^($'l)I  
  CHookApp(); U1r]e%df)  
  // Overrides ]P3m=/w  
  // ClassWizard generated virtual function overrides YJv$,Z&;HO  
  //{{AFX_VIRTUAL(CHookApp) &1Ndi<Y^  
 public: E<\$3G-do  
  virtual BOOL InitInstance(); B`mJT*B[  
  virtual int ExitInstance(); @F 5Af/  
  //}}AFX_VIRTUAL dLp1l2h!0  
  //{{AFX_MSG(CHookApp) nmU1xv_  
  // NOTE - the ClassWizard will add and remove member functions here. ]"_c-=  
  // DO NOT EDIT what you see in these blocks of generated code ! O#U maNj/  
  //}}AFX_MSG 8NHm#Z3Ol  
  DECLARE_MESSAGE_MAP() Z8 v8@Y  
}; :rL%,o"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); N; }$!sNIm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F_*']:p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w&?XsO@0W  
BOOL InitHotkey(); -F7F 6!s  
BOOL UnInit(); '<o3x$6 *  
#endif 1@v <  
|4mvB2r  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Qx4)'n  
#include "stdafx.h" 6axxyh%  
#include "hook.h" S=k!8]/d|  
#include <windowsx.h> itzUq,T  
#ifdef _DEBUG vb=]00c  
#define new DEBUG_NEW 6o^>q&e}%  
#undef THIS_FILE ~3:VM_  
static char THIS_FILE[] = __FILE__; NwF"Zh5eMW  
#endif |3FI\F;^q  
#define MAX_KEY 100 Y_Gd_+oJ  
#define CTRLBIT 0x04 .hW>#  
#define ALTBIT 0x02 hq7f"`  
#define SHIFTBIT 0x01  NAD^10  
#pragma data_seg("shareddata") U(f@zGV  
HHOOK hHook =NULL; Gt&yz"?D  
UINT nHookCount =0; iLnW5yy  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 'mZ v5?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 5}G_2<G  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]S%_&ZMCM  
static int KeyCount =0; E.*hY+kGZ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift &MpLm&  
#pragma data_seg() G Uu8 N  
HINSTANCE hins; Gt*<Awn8  
void VerifyWindow(); 'aEK{#en  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 'KjH|u  
//{{AFX_MSG_MAP(CHookApp) t#.}0Te7  
// NOTE - the ClassWizard will add and remove mapping macros here. C[,h!  
// DO NOT EDIT what you see in these blocks of generated code! 1R}9k)JQ  
//}}AFX_MSG_MAP ={xRNNUj_  
END_MESSAGE_MAP() m^oG9&";  
_qE9]mU  
CHookApp::CHookApp() IER;d\_V<  
{ &n | <NF  
 // TODO: add construction code here, jP<6J(  
 // Place all significant initialization in InitInstance _t-6m2A  
} |$/#,Dv7  
)s>|;K{  
CHookApp theApp; [,U l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <p<6!tdO  
{ 3_@I E2dA  
 BOOL bProcessed=FALSE; P\dfxR;8%  
 if(HC_ACTION==nCode) ^JxVs 7  
 { f=91 Z_M  
  if((lParam&0xc0000000)==0xc0000000){// Key up P6%qNR/ x  
   switch(wParam) pImq< Z  
   { pzRVX8  
    case VK_MENU: dUB;ZB7  
     MaskBits&=~ALTBIT; r } Wdj  
     break; 5dv|NLl  
    case VK_CONTROL: Gu{1%bb#kL  
     MaskBits&=~CTRLBIT; 8cfsl lI  
     break; i+S%e,U*  
    case VK_SHIFT: @B0fRG y  
     MaskBits&=~SHIFTBIT; -5e8m4*  
     break; b:9"nALgC  
    default: //judge the key and send message u L v  
     break; DBy%"/c  
   } Zah<e6L  
   for(int index=0;index<MAX_KEY;index++){ 4NRj>y  
    if(hCallWnd[index]==NULL) wy|b Hkr_  
     continue; ,I|^d.[2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M.SF}U  
    { k3LHLJZ#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Foj|1zJS_  
     bProcessed=TRUE; *B4OvHi)'  
    } "w 4^i!\  
   } nIOSP :'>  
  } Z[ !kEW  
  else if((lParam&0xc000ffff)==1){ //Key down n2o)K;wW+  
   switch(wParam) b$Ei>%'/";  
   { j7Zv"Vq@  
    case VK_MENU: v"Bm4+c&0  
     MaskBits|=ALTBIT; &n?RKcH}d  
     break; ?W dY{;&  
    case VK_CONTROL: 3 q8S  
     MaskBits|=CTRLBIT; \0i0#Dt9  
     break; SPe%9J+  
    case VK_SHIFT: w$]wd`N}  
     MaskBits|=SHIFTBIT; c=-qbG0`  
     break; s{c|J#s  
    default: //judge the key and send message +u |SX/C  
     break; \ %xku:  
   } @G>e Cj  
   for(int index=0;index<MAX_KEY;index++) 1uyd+*/(xP  
   { ;*Mr(#R  
    if(hCallWnd[index]==NULL) _iA oNT!  
     continue; u!HbS*jqq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o=zl{tZV  
    { i6FJG\d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M`iE'x  
     bProcessed=TRUE; # dUi['  
    } .f[z_% ar  
   } pL*aU=FjQ  
  } RP 6<#tq,  
  if(!bProcessed){ mU[  
   for(int index=0;index<MAX_KEY;index++){ H:Q4!<  
    if(hCallWnd[index]==NULL) U.Z5;E0:  
     continue; 6xr%xk2E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?{L'd  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); . Y!dO@$:  
   } "fN 6_*  
  } VV[Fb9W ;  
 } mTL`8hv?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7 > _vH]  
} T' Jl,)"  
,t*H: *  
BOOL InitHotkey() fC}uIci  
{ hoiC J}us  
 if(hHook!=NULL){ pOB<Bx5t  
  nHookCount++; 5]kv1nQ  
  return TRUE; [s] ZT  
 } ZBQ@S  
 else 3/c%4b.Z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); *k?y+}E_f  
  if(hHook!=NULL) ssH[\i  
   nHookCount++; 4T~wnTH0Xg  
  return (hHook!=NULL); @L 6)RF  
} 8RVRfy,w  
BOOL UnInit() Z;;A#h'%e  
{ SC3_S.  
 if(nHookCount>1){ Nn?$}g  
  nHookCount--; .rX,*|1x  
  return TRUE; <1QXZfQ"  
 } MlbcJo3  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 93,7yZ 5#  
 if(unhooked==TRUE){ Jt}#,I,B  
  nHookCount=0; :N_DJ51  
  hHook=NULL; 0xeY0!ux  
 } : Hu {MN\  
 return unhooked; B)P]C5KRD  
} R`Hy0;X  
>4+KEK  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <29K! [  
{ wL>;_KdU`  
 BOOL bAdded=FALSE; rJRg4Rog  
 for(int index=0;index<MAX_KEY;index++){ 7y.iXe!P  
  if(hCallWnd[index]==0){ N9rAosO*  
   hCallWnd[index]=hWnd; }iU pBn  
   HotKey[index]=cKey; $(*>]PC+)  
   HotKeyMask[index]=cMask; Krl9O]H/[  
   bAdded=TRUE; zXbA$c  
   KeyCount++; Zzb?Nbf  
   break; Wu$yB!  
  } h 'Hnq m  
 } @Q;s[Kg{!  
 return bAdded; <zAYq=IU  
} O,NVhU7,  
)me`Ud  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {:Kr't<XzF  
{ 3od16{YH  
 BOOL bRemoved=FALSE; +B&+FGfNU  
 for(int index=0;index<MAX_KEY;index++){ =([4pG  
  if(hCallWnd[index]==hWnd){ 6)20%*[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1<*U:W $g  
    hCallWnd[index]=NULL; [%~yY&  
    HotKey[index]=0; K{B|  
    HotKeyMask[index]=0; wTG(U3{3K  
    bRemoved=TRUE; Mq'm TM  
    KeyCount--; (Fq:G) $  
    break; TNK1E  
   } (Q8r2*L  
  } :3b02}b7  
 } -8<vWe  
 return bRemoved; 9QL%q; #  
} 25@@-2h @  
DVJn;X^T:  
void VerifyWindow() }6=)w@v  
{ #3'M>SaoH  
 for(int i=0;i<MAX_KEY;i++){ A r>BL2@  
  if(hCallWnd!=NULL){ Fop +xR,Z  
   if(!IsWindow(hCallWnd)){  ts=:r  
    hCallWnd=NULL; /SQ/$`1{  
    HotKey=0; vAqj4:j  
    HotKeyMask=0; 1xkrh qq  
    KeyCount--; D{[{&1\)r  
   } Kpa$1x  
  } .`V$j.a  
 } $$"G1<EZ  
} {8`$~c  
;[(d=6{hc]  
BOOL CHookApp::InitInstance() Bx#=$ka  
{ vLyazVj..  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); '3WtpsKA  
 hins=AfxGetInstanceHandle(); 7mMMVz2  
 InitHotkey(); >xq. bG  
 return CWinApp::InitInstance(); HEIg_6sb  
} o0|Ex\  
I~@8SSO,vH  
int CHookApp::ExitInstance() FF! PmfF'  
{ VuH ->  
 VerifyWindow(); !2Z"Lm  
 UnInit(); jX(hBnGW  
 return CWinApp::ExitInstance(); |D%mWQng  
} H:~u(N  
G9yK/g&q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6Io}3}3  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) isQOt * i  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]sk=V.GGQ  
#if _MSC_VER > 1000 o ]z#~^w  
#pragma once .g\Oj0Cbxh  
#endif // _MSC_VER > 1000 #Lp}j?Y  
Q}KOb4D  
class CCaptureDlg : public CDialog kLZVTVSJt  
{ x3+ {Y  
 // Construction H"6x/&s.=k  
 public: n$r`s`}  
  BOOL bTray; Br 7q.  
  BOOL bRegistered; Y%;X7VxU*  
  BOOL RegisterHotkey(); X.k8w\~  
  UCHAR cKey; j&'6|s{  
  UCHAR cMask; vk4 8&8  
  void DeleteIcon(); h-?yed*?  
  void AddIcon(); h72/03!  
  UINT nCount; p TwzVz~  
  void SaveBmp(); C1=&Vm>g+  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8X"4RyNSn  
  // Dialog Data m1Ya  
  //{{AFX_DATA(CCaptureDlg) {L%JDJ  
  enum { IDD = IDD_CAPTURE_DIALOG }; *YvtT (Gt  
  CComboBox m_Key; $jE<n/8  
  BOOL m_bControl; EHm*~Sd  
  BOOL m_bAlt; ION o&~-l  
  BOOL m_bShift; 'kt6%d2  
  CString m_Path; ?%hd3zc+f  
  CString m_Number; nsU7cLf"^V  
  //}}AFX_DATA 1LRP R@b^  
  // ClassWizard generated virtual function overrides K {v^Y,B  
  //{{AFX_VIRTUAL(CCaptureDlg) B#%QY\<X  
 public: p7;K] AW  
  virtual BOOL PreTranslateMessage(MSG* pMsg); PKrG6% W+  
 protected: >*ls} q^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |7c],SHm  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); E2>{ seZ  
  //}}AFX_VIRTUAL {]]%0!n\  
  // Implementation #&Tm%CvB  
 protected: \#:  W  
  HICON m_hIcon; =f!A o:Uc  
  // Generated message map functions :5%98V>02  
  //{{AFX_MSG(CCaptureDlg) )H W   
  virtual BOOL OnInitDialog(); 6LCtWX  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); n~ad#iN  
  afx_msg void OnPaint(); xn2nh@;  
  afx_msg HCURSOR OnQueryDragIcon(); @e3+Gs  
  virtual void OnCancel(); > UZ-['H  
  afx_msg void OnAbout(); ,FzkGB#  
  afx_msg void OnBrowse(); ojnO69v  
  afx_msg void OnChange(); %eDSo9Y  
 //}}AFX_MSG uK"  T~  
 DECLARE_MESSAGE_MAP() @rbd`7$%  
}; _F6<ba}o3  
#endif {TNORbZz  
1cOR?=G~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $lT8M-yK\  
#include "stdafx.h" 3xs<w7  
#include "Capture.h" <jV,VKL#  
#include "CaptureDlg.h" MygAmV&  
#include <windowsx.h> (_e[CqFu  
#pragma comment(lib,"hook.lib") qG;tD>jy  
#ifdef _DEBUG n/1t UF  
#define new DEBUG_NEW ZEI)U, I.  
#undef THIS_FILE ny13+Q`^  
static char THIS_FILE[] = __FILE__; A|f6H6UUx  
#endif 8*0QVFn$  
#define IDM_SHELL WM_USER+1 CPy>sV3Ru0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); kK4+K74B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h3E}Sa(MQ:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; unFm~rcf  
class CAboutDlg : public CDialog C8v  
{ zk3\v "  
 public: d]K8*a%[-  
  CAboutDlg(); ;Q&9 t  
  // Dialog Data X! 6dg.n5  
  //{{AFX_DATA(CAboutDlg) Qt\:A!'jw  
  enum { IDD = IDD_ABOUTBOX }; 9G6ZKqum  
  //}}AFX_DATA 4`o0?_.'  
  // ClassWizard generated virtual function overrides ;2`t0#J$]  
  //{{AFX_VIRTUAL(CAboutDlg) 6yUThv.G#  
 protected: *qL'WrB1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Iw?f1 ]  
  //}}AFX_VIRTUAL _I EbRVpb  
  // Implementation JXww_e[  
 protected: 3&E@#I^] ,  
  //{{AFX_MSG(CAboutDlg) F5H*z\/={  
  //}}AFX_MSG ~ m vv :u  
  DECLARE_MESSAGE_MAP() R)N^j'R~=  
}; CU c,  
I4ZbMnO  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t{s>B]i^_w  
{ Hr]  
 //{{AFX_DATA_INIT(CAboutDlg) .i?{h/9y  
 //}}AFX_DATA_INIT wNl6a9#  
} u f<%!=e  
(I;81h`1G  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 2YQBw,gG  
{ Ap"%%D^{:  
 CDialog::DoDataExchange(pDX); zA|lbJz=GY  
 //{{AFX_DATA_MAP(CAboutDlg) )BaGY  
 //}}AFX_DATA_MAP FB,rQ9D  
}  xi<}n#  
H,EZ% Gl  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DH$Nz  
 //{{AFX_MSG_MAP(CAboutDlg) %0vsm+XQ0E  
 // No message handlers )FA:wsy~E  
 //}}AFX_MSG_MAP d7&d FvG  
END_MESSAGE_MAP() {fEb>  
I3Z\]BI  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Xa"I  
: CDialog(CCaptureDlg::IDD, pParent) (VCJn<@@  
{  cFjD*r-  
 //{{AFX_DATA_INIT(CCaptureDlg) XdlA)0S)  
  m_bControl = FALSE; /{[tU-}qJ  
  m_bAlt = FALSE; BGH'&t_5  
  m_bShift = FALSE; _\@zq*E  
  m_Path = _T("c:\\"); =kOo(  
  m_Number = _T("0 picture captured."); V!@6Nv  
  nCount=0; A3q#,%  
  bRegistered=FALSE; J5f}-W@  
  bTray=FALSE; NVom6K  
 //}}AFX_DATA_INIT Y2ON!Rno  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 . Wd0}?}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); t!FC)iY  
} D^t: R?+  
FKf2Q&2I  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) X}QcXc.d  
{ BOdlz#&s  
 CDialog::DoDataExchange(pDX); z -]ND  
 //{{AFX_DATA_MAP(CCaptureDlg) |w>b0aY  
  DDX_Control(pDX, IDC_KEY, m_Key); VS~+W=5}  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?aB%h |VA  
  DDX_Check(pDX, IDC_ALT, m_bAlt); AS4oz:B  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); F,mStw:  
  DDX_Text(pDX, IDC_PATH, m_Path); Cnu])R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); &I{5f-o*  
 //}}AFX_DATA_MAP $.ctlWS8l{  
} ]h`d>#Hw!  
.F _u/"**  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @6;ZP1  
//{{AFX_MSG_MAP(CCaptureDlg) 0d 0ga^O  
 ON_WM_SYSCOMMAND() C(xsMO'k,,  
 ON_WM_PAINT() 4 4WyfpTJ*  
 ON_WM_QUERYDRAGICON() ?jbx7')  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) mSEX?so=[  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) XZTH[#MqeI  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &-vHb   
//}}AFX_MSG_MAP B\ZCJaMb  
END_MESSAGE_MAP() \z@ :OR,  
R_:lp\S&  
BOOL CCaptureDlg::OnInitDialog() wr>6Go%  
{ gla'urb[i|  
 CDialog::OnInitDialog(); Io /;+R .  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tI.ho  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3n_t^=  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %Go/\g   
 if (pSysMenu != NULL) P|;v>  
 { j0=H6Y  
  CString strAboutMenu; O_DT7;g  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Nk$|nn9#'  
  if (!strAboutMenu.IsEmpty()) 9T2y2d!X  
  { 0yb9R/3.  
   pSysMenu->AppendMenu(MF_SEPARATOR); $/E{3aT@F2  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !<h-2YF<M  
  } F*4G@)  
 }  \5HVX/  
 SetIcon(m_hIcon, TRUE); // Set big icon _Qb ].~  
 SetIcon(m_hIcon, FALSE); // Set small icon BG1hk!  
 m_Key.SetCurSel(0); & }_tALg  
 RegisterHotkey(); 3)(uC+?[  
 CMenu* pMenu=GetSystemMenu(FALSE); [E9_ZdB T  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); R@IwmJxX  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Z3X9-_g  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ny<D1>{90  
 return TRUE; // return TRUE unless you set the focus to a control &5%~Qw..  
} J8&0l&~ 6  
AG G xx?I  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) N=@8~{V.  
{ }C JK9*Z  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) aMxM3"  
 { Yg;7TKy  
  CAboutDlg dlgAbout; 6x16?x  
  dlgAbout.DoModal(); Q 9<i2H  
 } E8aD[j[w  
 else bhW&,"$Z  
 { b>& 3 XDz  
  CDialog::OnSysCommand(nID, lParam); Ma ]*Pled  
 } 4y,pzQ8a  
} T4;gF6(0]  
D@ BP<   
void CCaptureDlg::OnPaint() [q|8.>sB  
{ Z3dI B`@  
 if (IsIconic()) Ye/Y<Ij  
 { S e!B,'C%  
  CPaintDC dc(this); // device context for painting ~yY5pnJ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); c <X( S  
  // Center icon in client rectangle _u#r;h[  
  int cxIcon = GetSystemMetrics(SM_CXICON); jZ<f-Ff0  
  int cyIcon = GetSystemMetrics(SM_CYICON); 'pT8S  
  CRect rect; K/!>[d  
  GetClientRect(&rect); C]krJse@  
  int x = (rect.Width() - cxIcon + 1) / 2; H<l0]-S{  
  int y = (rect.Height() - cyIcon + 1) / 2; 75c\.=G9q<  
  // Draw the icon 4CxU eq  
  dc.DrawIcon(x, y, m_hIcon); 6PLdzZ{  
 } 8y]{I^z}  
 else ~[0^{$rrWs  
 { jq(rnbV  
  CDialog::OnPaint(); r <$"T  
 } T ?{F7  
} LUA<N:  
X D \;|  
HCURSOR CCaptureDlg::OnQueryDragIcon() F^cu!-L  
{ Y>CZ  
 return (HCURSOR) m_hIcon; ;Hu`BFXyD  
} n7bML?f'  
F441K,I  
void CCaptureDlg::OnCancel() ezhK[/E=  
{ 5Qxm\?0J  
 if(bTray) @[O|n)7  
  DeleteIcon(); W"5VqN6v  
  CDialog::OnCancel(); +VO(6Jn  
} #mRT>]di`D  
]fU0;jzX  
void CCaptureDlg::OnAbout() bqQR";  
{ YvFt*t  
 CAboutDlg dlg; [9~6, ;6  
 dlg.DoModal(); :\|<7n   
} @E?o~jO(e  
B?;P:!/1  
void CCaptureDlg::OnBrowse() 77%I%<#  
{ q)y<\cEO  
 CString str; +LaR_n[  
 BROWSEINFO bi; 32K  
 char name[MAX_PATH]; +w(B9rH  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ;Lk07+3G  
 bi.hwndOwner=GetSafeHwnd(); o=C'u  
 bi.pszDisplayName=name; yzyK$WN\[3  
 bi.lpszTitle="Select folder"; --F6n/>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; jJe?pT]o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); e0`5PVJ  
 if(idl==NULL) u X+ YH  
  return; XM:\N$tg  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); fD2 )/5j1  
 str.ReleaseBuffer(); RFLw)IWkL_  
 m_Path=str; /(DnMHn\  
 if(str.GetAt(str.GetLength()-1)!='\\') ??,/85lM  
  m_Path+="\\"; 4&G #Bi  
 UpdateData(FALSE); SF[}s uL  
} f_ |=EQ  
.c\iKc#  
void CCaptureDlg::SaveBmp() __,F_9M  
{ k6(0:/C  
 CDC dc; 4ms"mIt  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); |_%q@EID  
 CBitmap bm; D[3QQT7c  
 int Width=GetSystemMetrics(SM_CXSCREEN); Gw+pjSJL`  
 int Height=GetSystemMetrics(SM_CYSCREEN); Xt$Y&Ho  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 6-f-/$B  
 CDC tdc; f<3lxu  
 tdc.CreateCompatibleDC(&dc); 5a2+6N  
 CBitmap*pOld=tdc.SelectObject(&bm); P$&l1Mp  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); P$6 Pe>3  
 tdc.SelectObject(pOld); #F'8vf'r  
 BITMAP btm; )Qh*@=$-  
 bm.GetBitmap(&btm); =s,}@iqNO4  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Ui`#B  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |F&02 f!]@  
 BITMAPINFOHEADER bih; !3 zN [@w,  
 bih.biBitCount=btm.bmBitsPixel; a&u!KAQ  
 bih.biClrImportant=0; n _kE  
 bih.biClrUsed=0; XHh*6Yt_ (  
 bih.biCompression=0; x|)pZa  
 bih.biHeight=btm.bmHeight; cJzkA^T9  
 bih.biPlanes=1; D/+l$aBz  
 bih.biSize=sizeof(BITMAPINFOHEADER); WG +]  
 bih.biSizeImage=size; pRA%07?W  
 bih.biWidth=btm.bmWidth; 2x~Pq_?y  
 bih.biXPelsPerMeter=0; bZpx61h|  
 bih.biYPelsPerMeter=0; A0bR.*3  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Q+s2S>U{v  
 static int filecount=0;  2.'hr/.  
 CString name; S2>$S^[U  
 name.Format("pict%04d.bmp",filecount++); 15d'/f  
 name=m_Path+name; 8Z3:jSgk  
 BITMAPFILEHEADER bfh; B_>r|^Vh  
 bfh.bfReserved1=bfh.bfReserved2=0; >96+s)T%;  
 bfh.bfType=((WORD)('M'<< 8)|'B'); P3v4!tR  
 bfh.bfSize=54+size; pUa\YO1J  
 bfh.bfOffBits=54; -B#K}xL|x  
 CFile bf; 1p=bpJC  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |-z"6F r-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); o>|DT(Ib  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); yQf(/Uxk*x  
  bf.WriteHuge(lpData,size); V=8npz   
  bf.Close(); 5..YC=_20  
  nCount++; L nyow}  
 } pl/ek0QX  
 GlobalFreePtr(lpData); 1\nzfxx  
 if(nCount==1) aLlHR_  
  m_Number.Format("%d picture captured.",nCount); c/V0AKkS 8  
 else ~i!I6d~  
  m_Number.Format("%d pictures captured.",nCount); Wl }J=  
  UpdateData(FALSE); wCu!dxT|,  
} _%#Uh#7P$  
[3x},KM  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Y^y:N$3$\  
{ =sF4H_B  
 if(pMsg -> message == WM_KEYDOWN) <'\!  
 { ZD4aT1|Q7  
  if(pMsg -> wParam == VK_ESCAPE) $k`j";8uR  
   return TRUE; =Aw`0  
  if(pMsg -> wParam == VK_RETURN) }aQ*1Vcj  
   return TRUE; (p] S  
 } 6OqF-nso[E  
 return CDialog::PreTranslateMessage(pMsg); mP's4  
} NE4]i  
DuLl"w\_@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q(A_k+NL  
{ HZ1nuA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ t<`d*M2w  
  SaveBmp(); .`(YCn?\  
  return FALSE; e X6o 7a  
} +\?+cXSc  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ D1@yW} 4  
 CMenu pop; L >)|l  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); w9n0p0xr<  
 CMenu*pMenu=pop.GetSubMenu(0); G(BSe`f  
 pMenu->SetDefaultItem(ID_EXITICON); yPg0 :o-  
 CPoint pt; <PM.4B@  
 GetCursorPos(&pt); e)m6xiZ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); pG'?>]Rt4  
 if(id==ID_EXITICON) OR37  
  DeleteIcon(); 0A-yQzL|  
 else if(id==ID_EXIT) rhZ p  
  OnCancel(); fjY:u,5V_  
 return FALSE; _!Pi+l4p/}  
} 6']G HDK  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); lCBH3-0^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) V<?0(esgR  
 AddIcon(); J3e'?3w[  
 return res; h:sf?X[  
} g"kET]KP"  
yE(<F2  
void CCaptureDlg::AddIcon() K\zb+  
{ GG-b)64h`  
 NOTIFYICONDATA data; 3\{\ al   
 data.cbSize=sizeof(NOTIFYICONDATA); (ti!Y"e2  
 CString tip; +5 gX6V\  
 tip.LoadString(IDS_ICONTIP); Z9q4W:jyS  
 data.hIcon=GetIcon(0); Q7{{r&|t&  
 data.hWnd=GetSafeHwnd(); +XW1,ly~  
 strcpy(data.szTip,tip); E9Dy)f]#W  
 data.uCallbackMessage=IDM_SHELL; eu~ u-}.  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; XsDZ<j%x89  
 data.uID=98; ]6s/y  
 Shell_NotifyIcon(NIM_ADD,&data); "] Uj _d  
 ShowWindow(SW_HIDE); {d]B+'  
 bTray=TRUE; F!Cn'*  
} XKDX*x G  
 R0F [  
void CCaptureDlg::DeleteIcon() <#199`R  
{ +$xw0)|  
 NOTIFYICONDATA data; ;' |CSjco  
 data.cbSize=sizeof(NOTIFYICONDATA); ^:mKTiA-  
 data.hWnd=GetSafeHwnd(); lj:.}+]r  
 data.uID=98; 5|>ms)[RQ  
 Shell_NotifyIcon(NIM_DELETE,&data); q/Ji}NGm  
 ShowWindow(SW_SHOW); a=x &sz\x  
 SetForegroundWindow(); DiY74D  
 ShowWindow(SW_SHOWNORMAL); #W l^!)#j?  
 bTray=FALSE; o|c&$)m  
} A$n.'*gK  
"gzn%k[D9m  
void CCaptureDlg::OnChange() )8'v@8;-  
{ 3Zs0W{OxU  
 RegisterHotkey(); y4aT-^C'  
} \2#K {  
59v=\; UI  
BOOL CCaptureDlg::RegisterHotkey() RlU?F  
{ ?I:_FT  
 UpdateData(); r'_#rl  
 UCHAR mask=0; -nX{&Z3-s  
 UCHAR key=0; g 4|ai*^  
 if(m_bControl) Eza^Tbq%j?  
  mask|=4; $:1/`m19  
 if(m_bAlt) ~X %cbFom=  
  mask|=2; a?4Asn  
 if(m_bShift) U3v~R4  
  mask|=1; fCnwDT  
  key=Key_Table[m_Key.GetCurSel()]; <:N$ $n  
 if(bRegistered){ Zy{hYHQ  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); N~or.i&a  
  bRegistered=FALSE; !{ _:k%B  
 } mo= @Zt  
 cMask=mask; LWSy"Cs*  
 cKey=key; _ Qek|>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); N1'Yo:_A  
 return bRegistered; UfV { m  
} ";jAHGbO  
1rU\ !GfR  
  四、小结 7~ZG"^k  
d{(Rs.GuP  
  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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