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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: |,OTGZgc  
  B(U0 ~{7a  
  一、实现方法 /dt'iai~l  
e \ rb  
  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: @iD5X.c  
Rhil]|a/  
#pragma data_seg("shareddata") NJTC+`Hm  
HHOOK hHook =NULL; //钩子句柄 N~@VZbS(6  
UINT nHookCount =0; //挂接的程序数目 vV+>JM6<K  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 8GFA}_(^R  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ZeY kZzN  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey sKuPV  
static int KeyCount =0; }^ G&n';J  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 _HkB+D0v  
#pragma data_seg() B^sHFc""V  
Zfn390_  
  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。 (VA:`pstP  
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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: Afq?Ps+  
~\D H[Mt  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =*?2+ ;  
cKey,UCHAR cMask) k7ODQ(*v  
{ =D6H?K-k!  
 BOOL bAdded=FALSE; C>*]a(5k  
 for(int index=0;index<MAX_KEY;index++){ (Jb[_d*  
  if(hCallWnd[index]==0){ 8ncgTCH:  
   hCallWnd[index]=hWnd; %l8nTcL_?  
   HotKey[index]=cKey; $>mTPNF  
   HotKeyMask[index]=cMask; 8GD!]t#  
   bAdded=TRUE; ]VS$ ?wD  
   KeyCount++; =\l7k<  
   break; ; (;J  
  } o4g<[X)  
 } Uv"GG: K_  
 return bAdded; niIjatT  
} 1GL@t?S  
//删除热键 W!G2$e6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ooPH [p  
{ $6]7>:8mz  
 BOOL bRemoved=FALSE; N}2xt)JZz  
 for(int index=0;index<MAX_KEY;index++){ Fl^}tC  
  if(hCallWnd[index]==hWnd){ Y8yRQ zu  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !.ot&EbE  
    hCallWnd[index]=NULL; 3e.v'ccK&  
    HotKey[index]=0; bs_"Nn?  
    HotKeyMask[index]=0; h7H#sL[^  
    bRemoved=TRUE; 'of5v6:8  
    KeyCount--; v|v^(P,o  
    break; JV#)?/a$z  
   } H21\6 GY  
  } 4f?Y'+>Z,  
 } +=bGrn>h  
 return bRemoved; `+(|$?Cu  
} GL_a`.=@  
.h8%zB#|i  
uoe5@j2  
  DLL中的钩子函数如下: Jy X7I,0  
= ?hx+-'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]8XY "2b  
{ vQ}'4i8(  
 BOOL bProcessed=FALSE; fYzOT, c  
 if(HC_ACTION==nCode) yEfV8aY'*  
 { |,ZmRW^2K  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Sr`gQ#b@r}  
   switch(wParam) ;=.QT  
   {  _ .%\czO  
    case VK_MENU: M7(vI4V  
     MaskBits&=~ALTBIT; 0Up@+R2  
     break; G/Xa`4"_  
    case VK_CONTROL: 2\z"6  
     MaskBits&=~CTRLBIT; Pe !eID8  
     break; i7[CqObzc  
    case VK_SHIFT: Q\~4J1  
     MaskBits&=~SHIFTBIT; [k9aY$baT^  
     break; $z+iB;x  
    default: //judge the key and send message .FnO  
     break; 1;l&ck-Gg/  
   } ZL`G<Mo;.  
   for(int index=0;index<MAX_KEY;index++){ 2b]'KiX  
    if(hCallWnd[index]==NULL) q(Y<cJ?X  
     continue; 4C ;4"6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _F *(" o  
    { }Vpr7_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); xi=qap=S^9  
     bProcessed=TRUE; O\ T  
    } \"qXlTQ1_9  
   } /AR;O4X+  
  } q($lL~Ls  
  else if((lParam&0xc000ffff)==1){ //有键按下 JqO#W1h~R|  
   switch(wParam) TIV1?S  
   { PZF>ia}  
    case VK_MENU: Mc9P(5Bf  
     MaskBits|=ALTBIT; _gY so]S^B  
     break; KZL5>E  
    case VK_CONTROL: @$~ BU;kR  
     MaskBits|=CTRLBIT; FG~p _[K  
     break; 6$>m s6g%  
    case VK_SHIFT: Hm+-gI3*  
     MaskBits|=SHIFTBIT; ,XW6W&vR;  
     break; Lrr^obc  
    default: //judge the key and send message 2k[i7Rl \c  
     break; '!!w|k d  
   } *_$%Tv.]  
   for(int index=0;index<MAX_KEY;index++){ buRXzSR  
    if(hCallWnd[index]==NULL) )Xa`LG =|  
     continue; X9nt;A2TU+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <GShm~XD2  
    { j8@YoD5o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L;xc,"\3  
     bProcessed=TRUE; yg "u^*r&  
    } Etj*3/n|  
   } &j/ WjZPF  
  } MjG=6.J|`  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Y$EqBN  
   for(int index=0;index<MAX_KEY;index++){ RC8{QgaI  
    if(hCallWnd[index]==NULL) 2|o6~m<pE  
     continue; Um\Nd#=:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) GljxYH"]#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0K, *FdA  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 0z."6 r  
   } J W&/l  
  } )vsiX}3  
 } K,' ]G&K  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Zb7KHKO{  
} KMznl=LF  
(@O F Wc"p  
  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: Y.@ vdW  
7I`e5\ u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |nXs'TO'O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _"J-P={=  
fL"-K  
  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: &:8a[C2=  
6@!<' l%z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3bpbk  
{ )KR9alf3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !5 %c`4  
 { _p7c<$ ;  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 p[&'*"o!/  
  SaveBmp(); IQdiVj  
  return FALSE; D<}KTyG]  
 } oj@B'j  
 …… //其它处理及默认处理 Gw3|"14  
} Te2XQU2,F  
ZSYXUFz  
c3!d4mC:  
  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。 g`gH]W FcG  
F%6al,8P  
  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。 W*-+j*e|_P  
_=j0Y=/IF  
  二、编程步骤 bR49(K$~  
^Ebaq`{V\'  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; x!MYIaZ7  
of8/~VO  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; UBi0 /  
tp_*U,  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ]gkI:scPA  
h5x FP  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; pF#nj`L  
'(kGc%  
  5、 添加代码,编译运行程序。 >mT2g  
>!wX% QHH  
三、程序代码 &K)c*' l  
3yDa5q{  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL [1dlV/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) RMmDcvM"k  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ # o)a`,f  
#if _MSC_VER > 1000 [Pby  d  
#pragma once pb}QP  
#endif // _MSC_VER > 1000 e!ar:>T  
#ifndef __AFXWIN_H__ !u~( \ Rb;  
#error include 'stdafx.h' before including this file for PCH Yc/rjEn7O  
#endif #G|iEC0C  
#include "resource.h" // main symbols <y\>[7Y  
class CHookApp : public CWinApp L$l'wz  
{ G*mk 19Z  
 public: [$]vi`c2  
  CHookApp(); d;9 X1`"  
  // Overrides QOEcp% 6I}  
  // ClassWizard generated virtual function overrides xg/3*rL  
  //{{AFX_VIRTUAL(CHookApp) ?W9$=  
 public: `K~300-hOb  
  virtual BOOL InitInstance(); ;->(hFJt  
  virtual int ExitInstance(); 5sEq`P}5  
  //}}AFX_VIRTUAL %gJf&A  
  //{{AFX_MSG(CHookApp) zm9>"(H  
  // NOTE - the ClassWizard will add and remove member functions here. |9jeOV}/  
  // DO NOT EDIT what you see in these blocks of generated code ! :|M0n%-X  
  //}}AFX_MSG YT}m 8Y  
  DECLARE_MESSAGE_MAP() vEvVT]g[V  
}; l^%Ez?-:s  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); /'u-Fr(Q+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W'-B)li   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @.a[2,o_  
BOOL InitHotkey(); pqBd#  
BOOL UnInit(); d11~ mU\  
#endif 5K;jW  
#<S+E7uTs  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.  4EJ  
#include "stdafx.h" nxKV7d@R  
#include "hook.h" O2q`2L~  
#include <windowsx.h> ]P<u^ `{*  
#ifdef _DEBUG ^hq`dr|R=  
#define new DEBUG_NEW YbND2 i  
#undef THIS_FILE gb|C592R5C  
static char THIS_FILE[] = __FILE__; w{UVo1r:  
#endif C!]hu)E  
#define MAX_KEY 100 35?et-=w  
#define CTRLBIT 0x04 s|dcO  
#define ALTBIT 0x02 0[7\p\Q  
#define SHIFTBIT 0x01 w [D9Q=  
#pragma data_seg("shareddata") ^9%G7J:vGO  
HHOOK hHook =NULL; tz)aQ6p\X  
UINT nHookCount =0; R^<li;Km  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey CbVUz<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ow!utAF  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey xJa  
static int KeyCount =0; 0g,;Yzm  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift cclx$)X1X  
#pragma data_seg() E;*#fD~@  
HINSTANCE hins; f6j;Y<}' g  
void VerifyWindow(); uwXquOw  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Q35$GFj"jD  
//{{AFX_MSG_MAP(CHookApp) Waj6.PCFm  
// NOTE - the ClassWizard will add and remove mapping macros here. X&8&NkH  
// DO NOT EDIT what you see in these blocks of generated code! oa?bOm  
//}}AFX_MSG_MAP <xKer<D %  
END_MESSAGE_MAP() ) kfA5xi[  
WId"2W3M  
CHookApp::CHookApp() NBwxN  
{  SS[jk  
 // TODO: add construction code here, zp:kdN7!^  
 // Place all significant initialization in InitInstance ARGtWW~:  
} T ]hVO'z  
/X~l%Xm  
CHookApp theApp; {~_X-g5|]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >k"Z'9l  
{ U$&G_&*0a  
 BOOL bProcessed=FALSE; 0/S|h"-L  
 if(HC_ACTION==nCode) ;!q _+P  
 { }A\s`H m  
  if((lParam&0xc0000000)==0xc0000000){// Key up qT$;ZV #  
   switch(wParam) Aw~ =U!  
   { rU=qr&f"B  
    case VK_MENU: brx 7hI  
     MaskBits&=~ALTBIT; zc01\M  
     break; J]yUjnQ[h  
    case VK_CONTROL: -~ \R.<+  
     MaskBits&=~CTRLBIT; 9fj3q>Un,  
     break; 7g8}]\i+  
    case VK_SHIFT: +F.{:  
     MaskBits&=~SHIFTBIT; VNBf2Va  
     break; %nk]zf..  
    default: //judge the key and send message 1G$fU zS  
     break; ``$Dgj[  
   } {VtmQU? cJ  
   for(int index=0;index<MAX_KEY;index++){ cVYDO*N2T  
    if(hCallWnd[index]==NULL) B +[ri&6X\  
     continue; M!Q27wT8 O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F6 ?4&h?n  
    { <E/4/ ANN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s!(O7Ub  
     bProcessed=TRUE; ?f f!(U  
    } 4r&DW'  
   } Hof@,w  
  } meey5}  
  else if((lParam&0xc000ffff)==1){ //Key down r6S-G{o  
   switch(wParam) XVr>\T4  
   { QVLv}w`O  
    case VK_MENU: z*n  
     MaskBits|=ALTBIT; Yef=HSzo  
     break; (8T36pt~  
    case VK_CONTROL: `Sgj!/! F  
     MaskBits|=CTRLBIT; "Zm**h.t  
     break; & mwQj<Z  
    case VK_SHIFT: d5Hp&tm  
     MaskBits|=SHIFTBIT; N^</:R  
     break; 5x856RQ'  
    default: //judge the key and send message nwuH:6~"  
     break; eB%hP9=:x  
   } XrP'FLY o  
   for(int index=0;index<MAX_KEY;index++) B_R J;.oH  
   { p}H:t24Cr5  
    if(hCallWnd[index]==NULL) vP6NIcWC3  
     continue; t|-TG\Q X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t6u>_Sh e  
    { ;e Iqxe>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `o/G0~T)  
     bProcessed=TRUE; WK$75G,  
    } -' :;0  
   } ykK21P,v  
  } H4RqOI  
  if(!bProcessed){ +g %h,@  
   for(int index=0;index<MAX_KEY;index++){ [bM$n m  
    if(hCallWnd[index]==NULL) ,w-=8>5lrj  
     continue; ^u2unZ9BK!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pRR1k?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TQ`s&8"P  
   } UU\wP(f  
  } VWhq +8z  
 } |Y|6`9;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); QAGR\~  
} cPaz-  
zplAH!s5''  
BOOL InitHotkey() =u\W {1  
{ 3oD?e  
 if(hHook!=NULL){ Rhi`4wo0$  
  nHookCount++; ?e=3G4N  
  return TRUE; oF'_x,0  
 } pQ~Y7  
 else E>LZw>^Y J  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;ctPe[5  
  if(hHook!=NULL) *<HA])D,  
   nHookCount++; Pgug!![  
  return (hHook!=NULL); `U4e]Qh/+  
} {7d(B1[1  
BOOL UnInit() <S[]VXy  
{ BjX*Gm6l  
 if(nHookCount>1){ ,4W~CkLD  
  nHookCount--; %u=b_4K"j  
  return TRUE; xWRkg$A  
 } T-MC|>pv  
 BOOL unhooked = UnhookWindowsHookEx(hHook); FYBW3y+AF&  
 if(unhooked==TRUE){ % 9 Jx|  
  nHookCount=0; >wSrllmj@  
  hHook=NULL; ! 2=m |,  
 } GN1Q\8)o  
 return unhooked; %Z~0vwY  
} &VPfI  
(#e,tu  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,"e n7  
{ 7a0T]  
 BOOL bAdded=FALSE; c"*xw8|  
 for(int index=0;index<MAX_KEY;index++){ ]g] ]\hS  
  if(hCallWnd[index]==0){ }BYs.$7  
   hCallWnd[index]=hWnd; \]Bwib%h  
   HotKey[index]=cKey; d\O*Ol*/v  
   HotKeyMask[index]=cMask; s2=`haYu  
   bAdded=TRUE; {!0f.nv  
   KeyCount++; wXR7Ifrv  
   break; iQd,xr  
  } ^7Z#g0{^w  
 } 2I[(UMI$7  
 return bAdded; z:1"d R   
} R) ep1X^  
6Pp3*O`/V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z(!K8 T  
{ O'rz  
 BOOL bRemoved=FALSE; ,gO(zI-1  
 for(int index=0;index<MAX_KEY;index++){ TI5<' U)  
  if(hCallWnd[index]==hWnd){ tD^$}u6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,DL%oQR  
    hCallWnd[index]=NULL; -3GlpC22  
    HotKey[index]=0; 'Lu d=u{  
    HotKeyMask[index]=0; f|+aa6hN  
    bRemoved=TRUE; E !EENg  
    KeyCount--; 1[] 9EJ  
    break; QnJd}(yN  
   } #fVk;]u`[3  
  } Hb&C;lk  
 } %\f<N1~*  
 return bRemoved; n@=D,'cn  
} XpH d"(*  
dBm!`;r4  
void VerifyWindow() aN5"[&  
{ oUd R,;h9  
 for(int i=0;i<MAX_KEY;i++){ )BeB xo7lv  
  if(hCallWnd!=NULL){ -|DBO0q  
   if(!IsWindow(hCallWnd)){ %n{ue9  
    hCallWnd=NULL; W0+m A  
    HotKey=0; _uL8TC ^  
    HotKeyMask=0; ^ *1hz<  
    KeyCount--; 0/5{v6_rG  
   } d_1uv_P  
  } GIM'H;XG  
 } #O1%k;BL  
} 6s.>5}M!  
7`J= PG$A  
BOOL CHookApp::InitInstance() !sVW0JSh  
{ nPR*mbW  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); cI\&&<>SlG  
 hins=AfxGetInstanceHandle(); ^k2g60]  
 InitHotkey(); ,p' ;Xg6ez  
 return CWinApp::InitInstance(); 2n3!p Z8  
} s}lp^Uh=  
+.J/7 gD  
int CHookApp::ExitInstance() `f<&=_,xfH  
{ cGM?r}zJ  
 VerifyWindow(); YZy%]i=1  
 UnInit(); 2TccIv  
 return CWinApp::ExitInstance(); TCI)L}L|  
} 4N(iow4  
Dqg01_O9O  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file OrY^?E  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G`r/ tesW  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?_`X8Ok  
#if _MSC_VER > 1000 G'T: l("l  
#pragma once jaL#  
#endif // _MSC_VER > 1000 /k.?x]Ab  
^&7gUH*v  
class CCaptureDlg : public CDialog [:MFx6  
{ *J3Z.fq%:i  
 // Construction 'FM_5`&  
 public: #i  5@G*  
  BOOL bTray; 888"X3.T  
  BOOL bRegistered; ms6dl-_t  
  BOOL RegisterHotkey(); PI&@/+  
  UCHAR cKey; b^q%p1  
  UCHAR cMask; `^df la  
  void DeleteIcon(); RjxFlKs8  
  void AddIcon(); PTH'-G  
  UINT nCount; -\&b&;_  
  void SaveBmp(); LMRq.wxbbB  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor J-ErG!  
  // Dialog Data 4Z0Y8y8)  
  //{{AFX_DATA(CCaptureDlg) wCt!.<, .  
  enum { IDD = IDD_CAPTURE_DIALOG }; 'M35L30  
  CComboBox m_Key; f {j`d&|  
  BOOL m_bControl; ]D<3y IGS  
  BOOL m_bAlt; m](q,65 2  
  BOOL m_bShift; JN-W`2  
  CString m_Path; -ZH6*7!  
  CString m_Number; HX#$ ^@Q(  
  //}}AFX_DATA ,CIsZ1[VS  
  // ClassWizard generated virtual function overrides KkZS6rD\  
  //{{AFX_VIRTUAL(CCaptureDlg) dmYgv^t  
 public: Z#zXary5s  
  virtual BOOL PreTranslateMessage(MSG* pMsg); yq6:7<  
 protected: %\B@!4]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M7.H;.?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~j yl  
  //}}AFX_VIRTUAL \hD jZ  
  // Implementation e"cvo(}g  
 protected: '_ l5Br73=  
  HICON m_hIcon; ~=t K17i  
  // Generated message map functions r*g<A2g%  
  //{{AFX_MSG(CCaptureDlg) /DX6Hkkj%  
  virtual BOOL OnInitDialog(); MI,kKi  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (/jZ &4T  
  afx_msg void OnPaint(); ]6].l$%z#  
  afx_msg HCURSOR OnQueryDragIcon(); _i2guhRs*Q  
  virtual void OnCancel(); .zo>,*:t  
  afx_msg void OnAbout(); B *otqu z  
  afx_msg void OnBrowse(); qS[KB\RN1  
  afx_msg void OnChange(); ZjveXrx  
 //}}AFX_MSG fjLS_Q ;h  
 DECLARE_MESSAGE_MAP() C/ENJ&  
}; $q g/8G  
#endif %b>Ee>rdD  
IN?rPdY  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |W*i'E   
#include "stdafx.h" Vi>`g{\  
#include "Capture.h" <KrfM  
#include "CaptureDlg.h" b,lIndj#  
#include <windowsx.h> /-Y.A<ieN8  
#pragma comment(lib,"hook.lib") g]9A?#GyE  
#ifdef _DEBUG /3o@I5  
#define new DEBUG_NEW aA=7x&z@  
#undef THIS_FILE ^q\9HBHT  
static char THIS_FILE[] = __FILE__; K?6#jT6#  
#endif ]O0:0Z\  
#define IDM_SHELL WM_USER+1 Eb89B%L62G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HME`7dw?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )KKmV6>b  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; B`?5G\7L  
class CAboutDlg : public CDialog v4VP7h6uD)  
{ z K6'wL!!I  
 public: }TG=ZVi  
  CAboutDlg(); =j~Xrytn  
  // Dialog Data Jj7he(!_1  
  //{{AFX_DATA(CAboutDlg) jd+ U+8r  
  enum { IDD = IDD_ABOUTBOX }; @QAI 0ZY  
  //}}AFX_DATA -op(26:W<  
  // ClassWizard generated virtual function overrides UgD&tD0fp  
  //{{AFX_VIRTUAL(CAboutDlg) Lz=GA?lk[\  
 protected: j'q Iq;y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7i88iT  
  //}}AFX_VIRTUAL Q6hWHfS  
  // Implementation dReJ;x4  
 protected: ]::g-&%Um  
  //{{AFX_MSG(CAboutDlg) N _|tw  
  //}}AFX_MSG hw 0u?++  
  DECLARE_MESSAGE_MAP() kB=\a(  
}; p]x9hZ  
5^C.}/#>F  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) O_^;wey0}?  
{ frUO+  
 //{{AFX_DATA_INIT(CAboutDlg) nE=,=K~  
 //}}AFX_DATA_INIT A;gU@8m  
} e2"gzZ4;g  
aUbmEHFTV  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) *V?p&/>MT  
{ %<@x(q  
 CDialog::DoDataExchange(pDX); M5c~-}Ay  
 //{{AFX_DATA_MAP(CAboutDlg) UJk/Lxv  
 //}}AFX_DATA_MAP -P-&]F5  
} -P We  
,m1F<Pdts  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) .y>G/8_i  
 //{{AFX_MSG_MAP(CAboutDlg) o$k9$H>Na  
 // No message handlers -}9>#<v  
 //}}AFX_MSG_MAP ~ }?*v}  
END_MESSAGE_MAP() X^)v ZL?  
qORRpWyx&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Mc<O ~  
: CDialog(CCaptureDlg::IDD, pParent) ObSRd$M  
{ 52q<|MW%  
 //{{AFX_DATA_INIT(CCaptureDlg) D0LoT?$N  
  m_bControl = FALSE; tlcNGPa  
  m_bAlt = FALSE; 5'S~PQka*  
  m_bShift = FALSE; {!NX u  
  m_Path = _T("c:\\"); [6f(3|"  
  m_Number = _T("0 picture captured."); {R}Kt;L:Ut  
  nCount=0; E[2xo/H  
  bRegistered=FALSE; yR[htD`  
  bTray=FALSE; d'2q~   
 //}}AFX_DATA_INIT  _!E)a  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /Bp5^(s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^e(*{K;8  
} 5?XIp6%x  
o>Q=V 0?  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) OtZc;c  
{ ;ji[ "b  
 CDialog::DoDataExchange(pDX); rvp#[RAaS}  
 //{{AFX_DATA_MAP(CCaptureDlg) [xHHm5$  
  DDX_Control(pDX, IDC_KEY, m_Key); MhZ\]CAs9  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); d#-'DO{k  
  DDX_Check(pDX, IDC_ALT, m_bAlt); rVv4R/3+   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); maVfLVx-  
  DDX_Text(pDX, IDC_PATH, m_Path); 3h`_Qv%g  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Jo4iWJpK  
 //}}AFX_DATA_MAP \7] SG  
} H1-eMDe  
i2X%xYv ^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) BTDUT%Yfg  
//{{AFX_MSG_MAP(CCaptureDlg) vY!'@W  
 ON_WM_SYSCOMMAND() FS7@6I2Ts  
 ON_WM_PAINT() oP_}C[  
 ON_WM_QUERYDRAGICON() J3c8WS{:  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Zce/&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) l'twy$V4|~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) f8S!FGiNc  
//}}AFX_MSG_MAP 1`)e}p&  
END_MESSAGE_MAP() +{au$v}  
-d_7 q  
BOOL CCaptureDlg::OnInitDialog() n>W*y|UJ  
{ 4x"9Wr=}  
 CDialog::OnInitDialog(); #"!q_@b,D  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0YO/G1O&  
 ASSERT(IDM_ABOUTBOX < 0xF000); Sd+bnq%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^]X\boWlI  
 if (pSysMenu != NULL) '?uwUBi  
 { 5DmW5w'p  
  CString strAboutMenu; {3eg4j.Z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); fzZ`O{$8  
  if (!strAboutMenu.IsEmpty()) D]+]Br8  
  { {8T/;K@  
   pSysMenu->AppendMenu(MF_SEPARATOR); Pd04  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [^0 S#,L  
  } %![3?|8~  
 } T,/:5L9  
 SetIcon(m_hIcon, TRUE); // Set big icon =:_DXGW2H  
 SetIcon(m_hIcon, FALSE); // Set small icon 9y?)Ga  
 m_Key.SetCurSel(0); odh cU5  
 RegisterHotkey(); wf2v9.;X:<  
 CMenu* pMenu=GetSystemMenu(FALSE); &NH[b1NMr  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); pB'{_{8aA  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \EW<;xq  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); qu%}b>  
 return TRUE; // return TRUE unless you set the focus to a control )Y:C'*.r  
} .qS(-7<  
85qD~o?O  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) d[`vd^hI  
{ +'{d^-( (  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Sy"!Q%+ |  
 { c0QKx=  
  CAboutDlg dlgAbout; `Jn2(+  
  dlgAbout.DoModal(); y&6 pc   
 } (D2N_l(`<  
 else s2"<<P[q'  
 { *;[g Ga~  
  CDialog::OnSysCommand(nID, lParam); &vN^ *:Q  
 } Iad&Z8E  
} 6)yi^v  
w7Ij=!)  
void CCaptureDlg::OnPaint() ?,w9e|  
{ I R~szUY6  
 if (IsIconic()) om2)Cd9~7  
 { ZKt`>KZ  
  CPaintDC dc(this); // device context for painting *K;s*-|U  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); }///k]_Sh  
  // Center icon in client rectangle t&Jrchk  
  int cxIcon = GetSystemMetrics(SM_CXICON); +%R{j|8#  
  int cyIcon = GetSystemMetrics(SM_CYICON); 6cX Z3;a  
  CRect rect; DLPg0>;jl  
  GetClientRect(&rect); [r^WS;9n  
  int x = (rect.Width() - cxIcon + 1) / 2; =F09@C,  
  int y = (rect.Height() - cyIcon + 1) / 2; +}iuTqu5  
  // Draw the icon eFC~&L;  
  dc.DrawIcon(x, y, m_hIcon); Yc^,Cj{OM  
 } ,"5][RsOn  
 else RMlx[nsq  
 { LwcAF g|  
  CDialog::OnPaint(); E|y  
 } h-6x! 6pm  
} v+C%t!dx  
0t%`jY~%  
HCURSOR CCaptureDlg::OnQueryDragIcon() upiYo(sN.  
{ UB w*}p  
 return (HCURSOR) m_hIcon; ny1Dg$u i2  
} ]h'*L`  
@3`Pq2<  
void CCaptureDlg::OnCancel() %xdyG Al:  
{ WHcw5_3#  
 if(bTray) v;(k7  
  DeleteIcon(); up2wkc8  
  CDialog::OnCancel(); |!L0X@>  
} o]<J&<WM  
Dlg9PyQ  
void CCaptureDlg::OnAbout() + S@[1 N  
{ BBa!l e9P  
 CAboutDlg dlg; H3+P;2 {  
 dlg.DoModal();  ?%*p!m  
} :kvQ3E0  
(w`j?c1  
void CCaptureDlg::OnBrowse() [I,s:mn  
{ DDe`Lb%%  
 CString str; _8e0vi!~2  
 BROWSEINFO bi; GYtp%<<9;  
 char name[MAX_PATH]; |eK^Yhym  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); wQYW5X  
 bi.hwndOwner=GetSafeHwnd(); f1|&umJ$  
 bi.pszDisplayName=name; C?g<P0h  
 bi.lpszTitle="Select folder"; %[on.Q'1]2  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; '#>(JN5\  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); KebC$g@W  
 if(idl==NULL) A'n{K#  
  return; WNSEc%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 5% w08  
 str.ReleaseBuffer(); E.G]T#wt0  
 m_Path=str; |a=7P  
 if(str.GetAt(str.GetLength()-1)!='\\') {T3~js   
  m_Path+="\\"; 7GRPPh<4  
 UpdateData(FALSE); a}[rk*QmZ  
} n( zzH  
t@jke  
void CCaptureDlg::SaveBmp() (3&P8ZGNR  
{ V`}u:t7r  
 CDC dc; @zT2!C?^L  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3x>Y  
 CBitmap bm; \"b'Z2g  
 int Width=GetSystemMetrics(SM_CXSCREEN); %II o  
 int Height=GetSystemMetrics(SM_CYSCREEN); /|@~:5R5H  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @_ Tq>tOr&  
 CDC tdc; =l>=]O~h  
 tdc.CreateCompatibleDC(&dc); VyWzb  
 CBitmap*pOld=tdc.SelectObject(&bm); n$<n Yr`X  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,,;vG6^a  
 tdc.SelectObject(pOld);  NG?g(  
 BITMAP btm; T>w;M?`9K  
 bm.GetBitmap(&btm); 8Yf=)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *mn"G K6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7=a e^GKo  
 BITMAPINFOHEADER bih; _% i!LyG  
 bih.biBitCount=btm.bmBitsPixel; 0P;\ :-&p  
 bih.biClrImportant=0; )B"E+Q'h{7  
 bih.biClrUsed=0; t c{Qd&"(  
 bih.biCompression=0; ut.tf \c  
 bih.biHeight=btm.bmHeight; mp8Zb&Ggb  
 bih.biPlanes=1; V^_U=Ed@M  
 bih.biSize=sizeof(BITMAPINFOHEADER); |k]fY*z(  
 bih.biSizeImage=size; gSkY c{b  
 bih.biWidth=btm.bmWidth; 3\K;y>NK  
 bih.biXPelsPerMeter=0; e8{!Kjiz  
 bih.biYPelsPerMeter=0; oE)xL%*  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %$=2tfR  
 static int filecount=0; fni7HBV?  
 CString name; szp.\CMz  
 name.Format("pict%04d.bmp",filecount++); sU/vXweky"  
 name=m_Path+name; NMESGNa)z  
 BITMAPFILEHEADER bfh; 9]:F!d/  
 bfh.bfReserved1=bfh.bfReserved2=0; fvj  
 bfh.bfType=((WORD)('M'<< 8)|'B'); yh{U!hG  
 bfh.bfSize=54+size; AsR}qqG  
 bfh.bfOffBits=54; Wz;@Rl|F  
 CFile bf; y 7z)lBy\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [Xww`OUsh  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .dj}y jd]f  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); m`n#Q#6  
  bf.WriteHuge(lpData,size); oWq]\yT<`  
  bf.Close(); UTqKL*p523  
  nCount++; 1z_1Hl  
 } e^UUR-K%  
 GlobalFreePtr(lpData); 9r ](/"=f  
 if(nCount==1) 'rrnTd c  
  m_Number.Format("%d picture captured.",nCount); AI-ZZ6lzR  
 else fJ+4H4K  
  m_Number.Format("%d pictures captured.",nCount); lXXWQ=  
  UpdateData(FALSE); x^McUfdr|  
} ol}}c6  
zIr4!|X  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) G6s3 \de#U  
{ |Rz}bsrZ  
 if(pMsg -> message == WM_KEYDOWN) #I#_gjJkx  
 { +1c[!;'  
  if(pMsg -> wParam == VK_ESCAPE) H=9{|%iS  
   return TRUE; l@`n4U.Gwl  
  if(pMsg -> wParam == VK_RETURN) {dlG3P='`f  
   return TRUE; q><wzCnRu~  
 } ;A0ZcgF  
 return CDialog::PreTranslateMessage(pMsg); ={50>WXE  
} P>Ru  
;8w CQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N!<X% Ym  
{ 6\? 2=dNX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f;!L\$yKy  
  SaveBmp(); HBA|NV3.  
  return FALSE; sn+ kFvk}S  
} 6n H'NNS:J  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ w I[Hoi V  
 CMenu pop; QT4vjz+|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6t gq.XL^n  
 CMenu*pMenu=pop.GetSubMenu(0); a!.Y@o5Ku  
 pMenu->SetDefaultItem(ID_EXITICON); k=X)ax t1  
 CPoint pt; q[x|tO  
 GetCursorPos(&pt); *r ('A  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); XII',&  
 if(id==ID_EXITICON) rd,!-w5  
  DeleteIcon(); )"%J~:`h}  
 else if(id==ID_EXIT) **c"}S6:mC  
  OnCancel(); dJ~Occ1~r  
 return FALSE; :wfN+g=  
} uCgJ F@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); be [E^%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Fe2t[y:8h  
 AddIcon(); ;8cTy8  
 return res; ek d[|g  
} xu@xP5GB^  
WA5.qw  
void CCaptureDlg::AddIcon() #-l+c u{  
{ =[0| qGzg  
 NOTIFYICONDATA data; )Jh:~9L%='  
 data.cbSize=sizeof(NOTIFYICONDATA); bL|$\'S  
 CString tip; pxCQ=0k  
 tip.LoadString(IDS_ICONTIP); &Y3ZGRT  
 data.hIcon=GetIcon(0); 0Y8Cz/$  
 data.hWnd=GetSafeHwnd(); CDT;AdRw7  
 strcpy(data.szTip,tip); #<es>~0!  
 data.uCallbackMessage=IDM_SHELL; i0~Af`v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $p*.[)  
 data.uID=98; `2y?(BJp  
 Shell_NotifyIcon(NIM_ADD,&data); ~6{U^3  
 ShowWindow(SW_HIDE); gCbS$Pw  
 bTray=TRUE; sIRfC< /P  
} )GOio+{H  
=+H,}  
void CCaptureDlg::DeleteIcon() Dy{lgT0k  
{ :W$- b  
 NOTIFYICONDATA data; -4obX  
 data.cbSize=sizeof(NOTIFYICONDATA); 2`Ihrz6  
 data.hWnd=GetSafeHwnd(); k|$?b7)"@  
 data.uID=98; bpa'`sf  
 Shell_NotifyIcon(NIM_DELETE,&data); 6cOlY= bn  
 ShowWindow(SW_SHOW); m14'u GC  
 SetForegroundWindow(); <VhD>4f{]  
 ShowWindow(SW_SHOWNORMAL); UD Pn4q  
 bTray=FALSE; h r6?9RJY  
} (UZ].+)s  
Sx1OY0)s  
void CCaptureDlg::OnChange() EIF  
{ \/-4jF:  
 RegisterHotkey(); *]c~[&x5&  
} NMzq10M=6  
PoLk{{l3  
BOOL CCaptureDlg::RegisterHotkey() aJ[|80U  
{ KfQ?b_H.  
 UpdateData(); pDcGf7  
 UCHAR mask=0; spWo{  
 UCHAR key=0;  }- wK  
 if(m_bControl) ~VV$wU!A  
  mask|=4; HrUE?Sq  
 if(m_bAlt) |gU)6}V@  
  mask|=2; Z_mQpt|y  
 if(m_bShift) u,]qrlx{  
  mask|=1; : Xu9` 5  
  key=Key_Table[m_Key.GetCurSel()]; gP>W* ]0r1  
 if(bRegistered){ nuw7pEW@?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); t >Rh  
  bRegistered=FALSE; Ql"~ z^L  
 } *a-KQw  
 cMask=mask; %q6I-  
 cKey=key; v`U;.W  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -1w^z`;2h  
 return bRegistered; ? U =Mdw  
} >?.jN|  
Lz!H@)-mr  
  四、小结 ]1M Z:]k  
0D0uzUD-  
  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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