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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:  b}NNkM  
  AHn!>w,  
  一、实现方法 ~.3v\Q  
RN 4?]8  
  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: ?l%4 P5  
4F.,Y3  
#pragma data_seg("shareddata") U)f('zD  
HHOOK hHook =NULL; //钩子句柄 bu6Sp3g  
UINT nHookCount =0; //挂接的程序数目 A{;"e^a-^l  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 z<9C-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 *;}xg{@  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey D*2*FDGI  
static int KeyCount =0; ORrZu$n`p  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 yq|yGf(4&  
#pragma data_seg() M rgj*|  
D|(\5]:R  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 (<>??(VM  
J|{50?S{^  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: rkji#\_-FV  
"XxmiK  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ^cNuEF9  
cKey,UCHAR cMask) rM.Pc?Z  
{ _fZec+oM  
 BOOL bAdded=FALSE; h(yFr/  
 for(int index=0;index<MAX_KEY;index++){ hK)'dG*  
  if(hCallWnd[index]==0){ 3}s]F/e  
   hCallWnd[index]=hWnd; n*$g1HG6  
   HotKey[index]=cKey; /UK?&+1qE  
   HotKeyMask[index]=cMask; \h3HaNC  
   bAdded=TRUE; qvu1u GCc  
   KeyCount++; v)*MgfS  
   break; =&08s(A  
  } 4>oM5Yf8  
 } Mm*V;ADF  
 return bAdded; az![u)  
} }=v4(M`%  
//删除热键 ~vt*%GN3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w( SY  
{ A^M]vk%dg  
 BOOL bRemoved=FALSE; bv h#Q_  
 for(int index=0;index<MAX_KEY;index++){ }v}F8}4  
  if(hCallWnd[index]==hWnd){ hfI=9x/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ zZPWE "u}  
    hCallWnd[index]=NULL; Q/3*65  
    HotKey[index]=0; 5B|.cOE  
    HotKeyMask[index]=0; s"#N;  
    bRemoved=TRUE; 4vi?9MPz  
    KeyCount--; bL* b>R[x  
    break; Gr\jjf`  
   } [;IEZ/ZX  
  } L&s~j/ pR  
 } {1Cnrjw  
 return bRemoved; 75p9_)>96  
} _!zc <&~I  
+`wr{kB$~  
UfPB-EFl$D  
  DLL中的钩子函数如下: k0=!%f_G!  
0qNmao4E_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wxcJ2T dH  
{ J'|[-D-a  
 BOOL bProcessed=FALSE; ]Xa]a}[uE  
 if(HC_ACTION==nCode) LE{@J0r#n  
 { Sak^J.~G[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;6R9k]5P%  
   switch(wParam) _Ycz@Jn  
   {  ;taZixOH  
    case VK_MENU: 1@{ov!YB]  
     MaskBits&=~ALTBIT; 7#+Ih-&EQ  
     break; ~Yc~_)hD  
    case VK_CONTROL: %t,42jQ9  
     MaskBits&=~CTRLBIT; ^A&{g.0  
     break; aNKw.S>  
    case VK_SHIFT: yNfj-wM  
     MaskBits&=~SHIFTBIT; B!J?,SB  
     break; ):hz /vZ  
    default: //judge the key and send message N LpKh1g  
     break; SaGI4O_\s  
   } } 'xGip@W  
   for(int index=0;index<MAX_KEY;index++){ $/ "+t.ir3  
    if(hCallWnd[index]==NULL) @bTm.3  
     continue; Pq<43:*?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9~j"6wS  
    { {J1rjrPo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ht+roY  
     bProcessed=TRUE; g zi=+oJ|4  
    } lwt,w<E$  
   } )|v  du  
  } G3|23G.~)(  
  else if((lParam&0xc000ffff)==1){ //有键按下 En7+fQ  
   switch(wParam) 0^Ldw)C"  
   { **__&X p1  
    case VK_MENU: bj0HAgY@  
     MaskBits|=ALTBIT; <H] PP6_g:  
     break; ;DX{+Z[  
    case VK_CONTROL: Q (N'Oj:J  
     MaskBits|=CTRLBIT; 0_je@p+$  
     break; ynra%"sd  
    case VK_SHIFT: 6 [XaIco=C  
     MaskBits|=SHIFTBIT; {BM:c$3@j  
     break; VB  |k  
    default: //judge the key and send message Mz$qe  
     break; >DY/CcG\P  
   } Z(RsB_u5  
   for(int index=0;index<MAX_KEY;index++){ )x [=}0C  
    if(hCallWnd[index]==NULL) ?z M   
     continue; |mG;?>c)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2&'uO'K  
    { ,[p?u']yZz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); BeRs;^r+  
     bProcessed=TRUE; yg}L,JJU<  
    } _3wJ;cn.  
   } qDswFs(  
  } !-qk1+<h  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 o"RE4s\G~r  
   for(int index=0;index<MAX_KEY;index++){ _6.@^\;  
    if(hCallWnd[index]==NULL) Bz ,D4 E$  
     continue; p=[dt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7Y~5gn  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); u* iqwm.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 b*| ?7  
   } g-#eMQ%J  
  } QP<P,Bi~  
 } moVf(7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #|769=1  
} ;w%g*S  
q{*[uJ}Xc"  
  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: <F_w4!  
r{yIF~k@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "o;%em*Bc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J.2BBy  
Yy[=E\z  
  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: ^+~$eg&js  
uq:'`o-1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) uJ=&++[  
{ ArX*3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) jc6~V$3  
 { nC/T$ #G  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \K9Y@jnr  
  SaveBmp(); coaJDg+  
  return FALSE; 7m8:odeF  
 } 6"?#s/fk  
 …… //其它处理及默认处理 lKI]q<2  
} 0=`aXb-  
z}5'TV=^  
0_y&9Te  
  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。 PK?}hz  
D0f7I:i1  
  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。 S#+ _HFUK{  
`,GFiTPd  
  二、编程步骤 K24y;968  
Q4ii25]*  
  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"; IP !zg|c,  
IMSm  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; QKz2ONV=)  
$\4Or  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; z5:3.+M5  
6x;"T+BSSS  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ?1]B(V9nBq  
,aWfGh#$  
  5、 添加代码,编译运行程序。 nYRD>S?uz  
Pd  6  
三、程序代码 *=E4|>Ul,  
0\$Lnwp_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL :]C\DUBo  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [MC}zd'/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9D%~~~ %b  
#if _MSC_VER > 1000 U8g?   
#pragma once jaux:fU  
#endif // _MSC_VER > 1000 t.O4-+$ig  
#ifndef __AFXWIN_H__ '?fn} V  
#error include 'stdafx.h' before including this file for PCH Ke&fTK  
#endif xi\uLu?i  
#include "resource.h" // main symbols A,ao2)  
class CHookApp : public CWinApp ~ YZi"u  
{ -H_7GVSnl  
 public: oWOH#w  
  CHookApp(); p:U{3uN 62  
  // Overrides 3^ &pb  
  // ClassWizard generated virtual function overrides t;ga>^NA"  
  //{{AFX_VIRTUAL(CHookApp) s{j3F  
 public: zwHTtE  
  virtual BOOL InitInstance(); `Sj8<O}  
  virtual int ExitInstance(); tX}Fb0y  
  //}}AFX_VIRTUAL `+@%l*TQ  
  //{{AFX_MSG(CHookApp) [c6_6q As  
  // NOTE - the ClassWizard will add and remove member functions here. Fn%:0j  
  // DO NOT EDIT what you see in these blocks of generated code ! .^1=*j(;  
  //}}AFX_MSG  6Ue6b$xE  
  DECLARE_MESSAGE_MAP() 0P53dF  
}; d}415 XA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);  *JOv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q`;URkjk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4]8PF  
BOOL InitHotkey(); 1$2Rs-J  
BOOL UnInit(); CUw 9aH  
#endif 1r w>gR  
qOa-@MN  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. oq<#  
#include "stdafx.h" Bp6Evi  
#include "hook.h" -XY]WWlq  
#include <windowsx.h> (/Y gcT  
#ifdef _DEBUG &c@I4RV|q  
#define new DEBUG_NEW ZNA?`Z)f  
#undef THIS_FILE ?,),%JQ  
static char THIS_FILE[] = __FILE__; ]g+(#x_.?  
#endif IweQB}d  
#define MAX_KEY 100 qx? lCz a"  
#define CTRLBIT 0x04 en~(XE1  
#define ALTBIT 0x02 eZJOI1wNp  
#define SHIFTBIT 0x01 i|d41u;@  
#pragma data_seg("shareddata")  y.eBFf  
HHOOK hHook =NULL; ;NPb  
UINT nHookCount =0; MDCf(LhEH  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey *'t`;m~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }&naP   
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey KJkcmF}Q  
static int KeyCount =0; @',;/j80  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift da^9Fb  
#pragma data_seg() ta 4<d)nB  
HINSTANCE hins; Vis?cuU/  
void VerifyWindow(); E0h!%/+-L  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) kI;^V  
//{{AFX_MSG_MAP(CHookApp) WK^qYfq|  
// NOTE - the ClassWizard will add and remove mapping macros here. 1!NaOfP;@  
// DO NOT EDIT what you see in these blocks of generated code! ^e 6(#SqR  
//}}AFX_MSG_MAP 6qA{l_V  
END_MESSAGE_MAP() p_(hM&>C  
5Np.&  
CHookApp::CHookApp() XZT( :(  
{ '}Y8a$(;V  
 // TODO: add construction code here, =gqZ^v&5U  
 // Place all significant initialization in InitInstance ?3, *  
} ff hD+-gTU  
nz&JG~Qfm  
CHookApp theApp; J/*[wj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) e O}mZN  
{ &\K#UVDyhh  
 BOOL bProcessed=FALSE; Bms?`7}N  
 if(HC_ACTION==nCode) ,?f(~<Aj  
 { sR0nY8@F  
  if((lParam&0xc0000000)==0xc0000000){// Key up WL~`L!_. A  
   switch(wParam) K=>/(s Wiq  
   { U5PCj ]-Xt  
    case VK_MENU: 8UZE C-K  
     MaskBits&=~ALTBIT; Te/)[I'Tn  
     break; Y+7v~/K=  
    case VK_CONTROL: 87/{\h  
     MaskBits&=~CTRLBIT; ZqGq%8\.s  
     break; S9BJjo  
    case VK_SHIFT: n(+:l'#HJ  
     MaskBits&=~SHIFTBIT; pVY.&XBZ$  
     break; 5VcYdu3  
    default: //judge the key and send message ']NM_0  
     break; O#|E7;  
   } S{H8}m|MW  
   for(int index=0;index<MAX_KEY;index++){ GgYomR:  
    if(hCallWnd[index]==NULL) }?^G= IP4(  
     continue; eyWwE%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DQ}]'*@?  
    { iB`m!g6$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); oAx0$]+%V)  
     bProcessed=TRUE; WQ]pg "  
    } ] ge-b\  
   } `F@yZ4L3S  
  } M/qiA.C@W  
  else if((lParam&0xc000ffff)==1){ //Key down N@>S>U8C  
   switch(wParam) EIfrZg7R  
   { o_5@R+&  
    case VK_MENU: PTh Ya  
     MaskBits|=ALTBIT; s5dh]vNN  
     break; Lsz`nD5  
    case VK_CONTROL: a`uT'g[*  
     MaskBits|=CTRLBIT; \CGcP  
     break; 1XKk~G"D  
    case VK_SHIFT: Sm,$~~iq}  
     MaskBits|=SHIFTBIT; xl^'U/  
     break; ZjK~s)RC  
    default: //judge the key and send message 90!Ib~7zH  
     break; Z-?9F`}  
   } a*8}~p,  
   for(int index=0;index<MAX_KEY;index++) ;F Bc^*q  
   { H#y"3E<s  
    if(hCallWnd[index]==NULL) Mg$Z^v|}0  
     continue; 1d"P) 3dQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sFTIRVXN,  
    { Y(f-e,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); xd3  
     bProcessed=TRUE; 2o/`8+eJu  
    } ^J_hkw~gO  
   } qr 9 F  
  } [8w2U%}]  
  if(!bProcessed){ YB|9k)Z2[  
   for(int index=0;index<MAX_KEY;index++){ ihVQ,Cth  
    if(hCallWnd[index]==NULL) '3Ie0QO]"%  
     continue; EUkNh>U?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =)8Ct  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 68*{Lo?U  
   } |*5nr5c_L  
  } 4#w^PM8}  
 } qu%s 7+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); / ["T#`  
} 2cg z n@  
,Mc 2dhq  
BOOL InitHotkey() Mm!saKT%  
{ 8E+l; 2  
 if(hHook!=NULL){ as4NvZ@+r  
  nHookCount++; F?kVW[h?q  
  return TRUE; @El<"\  
 } *@nUas 2"  
 else ?s]`G'=>V`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); JPG!cX%  
  if(hHook!=NULL) 4/?Zp4g  
   nHookCount++; fna>>  
  return (hHook!=NULL); g OM`I+CwT  
} pS;dvZ  
BOOL UnInit() D.b<I79bX  
{ 0 y%R  
 if(nHookCount>1){ [\1l4C  
  nHookCount--; vNbA/sM  
  return TRUE; mtHz6+  
 } $@)d9u cd  
 BOOL unhooked = UnhookWindowsHookEx(hHook); HV.7IyBA^  
 if(unhooked==TRUE){ #8jd,I% L  
  nHookCount=0; 3)a29uc:U  
  hHook=NULL; ltR^IiA}  
 } <4,?lZ  
 return unhooked; }o- P   
} 8B/9{8  
 /GUuu  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "S:N- Tf%U  
{ 8A.7=C' z  
 BOOL bAdded=FALSE; 'wrpW#  
 for(int index=0;index<MAX_KEY;index++){ tqCg<NH.!m  
  if(hCallWnd[index]==0){ [@Y q^.6t  
   hCallWnd[index]=hWnd; C6~dN& q  
   HotKey[index]=cKey; /p0LtUMu  
   HotKeyMask[index]=cMask; us%RQ8=k  
   bAdded=TRUE; zQ}N mlk  
   KeyCount++; CaBS0' n  
   break; %LHV0u  
  } zP}v2  
 } RfG$Px '  
 return bAdded; 5i#w:O\cz  
} ^^l"brPa  
9G+rxyWMW  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6~W E#z_  
{ o q)"1  
 BOOL bRemoved=FALSE; V&v~kzLr+  
 for(int index=0;index<MAX_KEY;index++){ T(^8ki  
  if(hCallWnd[index]==hWnd){ gq3OCA!cX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ GuvF   
    hCallWnd[index]=NULL; |LE++t*X~  
    HotKey[index]=0; 0K0=Ob^(e  
    HotKeyMask[index]=0; l0if#?4\r  
    bRemoved=TRUE; r$Y!Y#hwQ  
    KeyCount--; L"%eQHEC&  
    break; z 5+]Z a~  
   } +lJ]-U|P  
  } 8T )ELhTj  
 } J6D$ i+  
 return bRemoved; Ilb |:x"L  
} N06O.bji  
agT[y/gb  
void VerifyWindow() e~]e9-L>I  
{ }yDq\5s Q[  
 for(int i=0;i<MAX_KEY;i++){ {NgY8w QB  
  if(hCallWnd!=NULL){ \3?;[xD  
   if(!IsWindow(hCallWnd)){ B Rj KV  
    hCallWnd=NULL; 4^_Au^8R(  
    HotKey=0; #-j! ;?  
    HotKeyMask=0; B-'BJ|*4I  
    KeyCount--; 8k?L{hF|nW  
   } }AZx/[k |z  
  } *[:CbFE0y  
 } Yka&Kkw  
} mIEaWE;E"  
9R"N#w.U]  
BOOL CHookApp::InitInstance() <L/vNP  
{ ?9@Af{b t2  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); I} fcFL8  
 hins=AfxGetInstanceHandle(); {<[tYZmj.  
 InitHotkey(); %&+R":Bw  
 return CWinApp::InitInstance(); .0W4Dp  
} L$c%u  
f?^Oy!1]  
int CHookApp::ExitInstance() EiP&Y,vT  
{ (A fbS=[  
 VerifyWindow(); '4lT*KN7\  
 UnInit(); wf< `J/7u  
 return CWinApp::ExitInstance(); Tc5OI'-V  
} 3l(;Pt-yI  
,h.Jfo54,  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file yi-"hT`  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) BBE1}V!u  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^^3va)1{!  
#if _MSC_VER > 1000 x][9ptr h  
#pragma once G:C6`uiy`  
#endif // _MSC_VER > 1000 8kM0  
<ZC^H  
class CCaptureDlg : public CDialog '# IuY  
{ AYu'ptDNr  
 // Construction G^@Jgx3n  
 public: ?WtG|w  
  BOOL bTray;  zn;Hs]G  
  BOOL bRegistered; 5@t uo`k  
  BOOL RegisterHotkey(); A+1]Ql)$  
  UCHAR cKey; ~K$"PK s3  
  UCHAR cMask; 7  cP[o+  
  void DeleteIcon(); vJAAAS  
  void AddIcon(); ) wo2GF  
  UINT nCount;  [Ro0eH  
  void SaveBmp(); /Q>{YsRRB  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3/IWO4?_  
  // Dialog Data dzE Q$u/I  
  //{{AFX_DATA(CCaptureDlg) ?$@ KwA  
  enum { IDD = IDD_CAPTURE_DIALOG }; m-S33PG{  
  CComboBox m_Key; ;E?  hz  
  BOOL m_bControl; Vt)\[Tl~  
  BOOL m_bAlt; lJ]\  
  BOOL m_bShift; 4OZ5hH h  
  CString m_Path; mx(%tz^t  
  CString m_Number; QDgEJ%U-  
  //}}AFX_DATA QD;f~fZ  
  // ClassWizard generated virtual function overrides (6#yw`\  
  //{{AFX_VIRTUAL(CCaptureDlg) H0b6ZA%n  
 public: ivUsMhx>S,  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !0csNg!  
 protected: K9O,7h:x  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support FDd>(!>  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ZR-s{2sl  
  //}}AFX_VIRTUAL CBnouKc:  
  // Implementation KgTGxCH  
 protected: kl3S~gE4@  
  HICON m_hIcon; )\D40,p  
  // Generated message map functions e]*=sp!T  
  //{{AFX_MSG(CCaptureDlg) P2Qyz}!wo  
  virtual BOOL OnInitDialog(); r {B,uj"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0.BUfuuh  
  afx_msg void OnPaint(); & kjwIg{  
  afx_msg HCURSOR OnQueryDragIcon(); kGuk -P  
  virtual void OnCancel(); $sL|'ZMbS  
  afx_msg void OnAbout(); q>|[JJ*6_N  
  afx_msg void OnBrowse(); & A9A#It  
  afx_msg void OnChange(); #C,f/PXfaB  
 //}}AFX_MSG bu"68A;>  
 DECLARE_MESSAGE_MAP() ic0v*Y$  
}; 51ajE2+X&  
#endif U_}A{bFG  
sAD P~xvU  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file K)Xs L  
#include "stdafx.h" W]yClx \  
#include "Capture.h" +G!jKta7B  
#include "CaptureDlg.h" r0g/:lJi  
#include <windowsx.h> [N95.aD  
#pragma comment(lib,"hook.lib") nvs}r%1'5  
#ifdef _DEBUG VkTlPmr  
#define new DEBUG_NEW DYT -#Ht  
#undef THIS_FILE aa0`y  
static char THIS_FILE[] = __FILE__; `l gjw=  
#endif )_c=mT  
#define IDM_SHELL WM_USER+1 EB29vHAt~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dp[w?AMhM9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R0hc tT1j  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 4`UL1)A]  
class CAboutDlg : public CDialog C>:/(O  
{ T$8@2[  
 public: ZH;y>Z  
  CAboutDlg(); kToVBU$  
  // Dialog Data @`kiEg'Q  
  //{{AFX_DATA(CAboutDlg) Y0 X"Zw  
  enum { IDD = IDD_ABOUTBOX }; >: W-C{%  
  //}}AFX_DATA 4QjWZ Wl  
  // ClassWizard generated virtual function overrides [C+Gmu  
  //{{AFX_VIRTUAL(CAboutDlg) HL(U~Q6JQ  
 protected: H7yg9zFT N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D-o7yc"K  
  //}}AFX_VIRTUAL b,rH&+2H  
  // Implementation 2i7i\?<.  
 protected: s?@)a,C%k  
  //{{AFX_MSG(CAboutDlg) g* \P6  
  //}}AFX_MSG X@yr$3vC  
  DECLARE_MESSAGE_MAP() U7]<U-.&  
}; hSkc9jBF  
W3jXZ>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0tW<LR-}E  
{ Pn+IJ=0Y  
 //{{AFX_DATA_INIT(CAboutDlg) &'huS?g A9  
 //}}AFX_DATA_INIT J~iOP  
} W8G9rB|T  
MS st  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) b@2Cl l#  
{ &PRx,G5  
 CDialog::DoDataExchange(pDX); {HIR>])o  
 //{{AFX_DATA_MAP(CAboutDlg) EREolCASb  
 //}}AFX_DATA_MAP +-H}s`  
} Gq0]m  
@@%i( >4Z  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) jNe(w<',P  
 //{{AFX_MSG_MAP(CAboutDlg) (@KoqwVWc  
 // No message handlers |%'6f}fnE  
 //}}AFX_MSG_MAP "+n4c'  
END_MESSAGE_MAP() _}I(U?Q-C  
H:q)^$s  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) a@fE46o6<  
: CDialog(CCaptureDlg::IDD, pParent) J7'f@X~nM  
{ X!7VyE+n  
 //{{AFX_DATA_INIT(CCaptureDlg) ] Wx>)LT  
  m_bControl = FALSE; IP30y>\  
  m_bAlt = FALSE; S]e j=6SP  
  m_bShift = FALSE; d)04;[=  
  m_Path = _T("c:\\"); fjIcB+Z  
  m_Number = _T("0 picture captured."); _e?q4>B)c  
  nCount=0; ]DC;+;8Jc  
  bRegistered=FALSE; \);.0  
  bTray=FALSE; 5!'R'x5e  
 //}}AFX_DATA_INIT HDF!`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]g;^w?9h  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); J+)'-OFt0  
} MvFM ,  
N+CXOI=6x  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) NI5]Nz<?  
{ >H0) ph  
 CDialog::DoDataExchange(pDX); }O,U2=Hw`]  
 //{{AFX_DATA_MAP(CCaptureDlg) xl+DRPzl  
  DDX_Control(pDX, IDC_KEY, m_Key); zH)cU%I@.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2PVx++*]C  
  DDX_Check(pDX, IDC_ALT, m_bAlt); XYqpI/s  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); "t[M'[ `C  
  DDX_Text(pDX, IDC_PATH, m_Path); On{~St'V  
  DDX_Text(pDX, IDC_NUMBER, m_Number); gohAp  
 //}}AFX_DATA_MAP ]ZzoJ7lr  
} uQGz;F x  
AVXX\n\_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `y\*m]:  
//{{AFX_MSG_MAP(CCaptureDlg) ds*m6#1b  
 ON_WM_SYSCOMMAND() O^.%C`*  
 ON_WM_PAINT() cS<TmS!  
 ON_WM_QUERYDRAGICON() Q7,EY /  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) uP{; *E3?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hq/J6 M  
 ON_BN_CLICKED(ID_CHANGE, OnChange) c%|vUAq*  
//}}AFX_MSG_MAP )\{'fF  
END_MESSAGE_MAP() UI!6aVL.  
/635B*g  
BOOL CCaptureDlg::OnInitDialog() `IEq@Wr#$!  
{ )46 0 Ed  
 CDialog::OnInitDialog(); 0o=!j3RjH  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Dn~Z SrJ  
 ASSERT(IDM_ABOUTBOX < 0xF000); zuUT S[  
 CMenu* pSysMenu = GetSystemMenu(FALSE); i]it5  
 if (pSysMenu != NULL) <=q*N;=T,  
 { ds- yif6   
  CString strAboutMenu; Y)$52m5rM  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?VFM ]hO  
  if (!strAboutMenu.IsEmpty()) w[ Axs8N'  
  { hVMYB_<~  
   pSysMenu->AppendMenu(MF_SEPARATOR); y L*LJ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 12idM*  
  } tf4*R_6;1$  
 } /&CUspb  
 SetIcon(m_hIcon, TRUE); // Set big icon p3g4p  
 SetIcon(m_hIcon, FALSE); // Set small icon RnHQq'J|\  
 m_Key.SetCurSel(0); D9ANm"#  
 RegisterHotkey(); Tdg6kkJ  
 CMenu* pMenu=GetSystemMenu(FALSE); {tPnj_|n<  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); m"n.Dz/S  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); iJ}2"i7M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m&Lt6_vi  
 return TRUE; // return TRUE unless you set the focus to a control @4;&hP2Z:  
} L >SZgmV+  
*5 e<\{!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) j5kA^MTG  
{ ^w>&?A'!  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) f2NA=%\  
 { o6*/o ]]  
  CAboutDlg dlgAbout; aSUsyOe  
  dlgAbout.DoModal(); l1&5uwuF  
 } 4<u;a46Z#M  
 else l$F_"o?&S@  
 { l{8CISO*  
  CDialog::OnSysCommand(nID, lParam); P*0f~eu  
 } g[M]i6h2  
} hHpx?9O+!  
GE@uO J6H  
void CCaptureDlg::OnPaint() 8$ic~eJ  
{ XJUEwX  
 if (IsIconic()) g^jJ8k,7(  
 { I-,>DLG  
  CPaintDC dc(this); // device context for painting pDGT@qJ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Rfht\{N 7  
  // Center icon in client rectangle <KtBv Ip]  
  int cxIcon = GetSystemMetrics(SM_CXICON); V"O 9n[|  
  int cyIcon = GetSystemMetrics(SM_CYICON); >)LAjwhBp  
  CRect rect; u*hH }  
  GetClientRect(&rect); `mrCu>7  
  int x = (rect.Width() - cxIcon + 1) / 2; |"Z-7@/k$i  
  int y = (rect.Height() - cyIcon + 1) / 2; D ZVXz|g  
  // Draw the icon l8^y]M  
  dc.DrawIcon(x, y, m_hIcon); CJp-Y}fGEA  
 } )!A 2>  
 else D i+4Eb  
 { 0pD[7~^o  
  CDialog::OnPaint(); q3+I<qsAz  
 } glx2I_y  
} ]oEQ4  
I]jX7.fx  
HCURSOR CCaptureDlg::OnQueryDragIcon() 8)pB_en3sO  
{ *<r%aeG$em  
 return (HCURSOR) m_hIcon; |CwG3&8  
} N+NK`  
BhLZ7*  
void CCaptureDlg::OnCancel() _%%yV  
{ 7%4.b7Q  
 if(bTray) yw'ezpO"  
  DeleteIcon(); JA<~xo[Q9  
  CDialog::OnCancel(); gKWzFnW  
} (xL :;  
*Rq`*D>:U}  
void CCaptureDlg::OnAbout() P{cos&X|  
{ #&V5H{  
 CAboutDlg dlg; [t{](-  
 dlg.DoModal(); ^>^ \CP]  
} g2=}G<*0  
KaW~ERx5  
void CCaptureDlg::OnBrowse() V\AK6U@r^  
{ .b,~f  
 CString str; Fj^AW v^/  
 BROWSEINFO bi; n' ?4.tb  
 char name[MAX_PATH];  %}h`+L  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 4 \ F P  
 bi.hwndOwner=GetSafeHwnd();  , ]7XMU3  
 bi.pszDisplayName=name; ~ M*gsW$  
 bi.lpszTitle="Select folder"; Sph*1c(R  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ufP Cx|x~  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); dF e4K"  
 if(idl==NULL) GJ`UO  
  return; >S'>!w  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Fg=v6j4W  
 str.ReleaseBuffer(); _R74/|  
 m_Path=str; )b92yP{  
 if(str.GetAt(str.GetLength()-1)!='\\') 6e# wR/  
  m_Path+="\\"; Cw#V`70a  
 UpdateData(FALSE); 2r;GcjezH  
} 6vobta^w  
6m+W#]^  
void CCaptureDlg::SaveBmp() &$#99\ /  
{ &z>q#'X;.  
 CDC dc; %ek"!A  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); h<Wg3o  
 CBitmap bm; tpo>1|  
 int Width=GetSystemMetrics(SM_CXSCREEN); #ZWl=z5aBi  
 int Height=GetSystemMetrics(SM_CYSCREEN); OQFi.  8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); FJwt?3\u5  
 CDC tdc; 7`fY*O6   
 tdc.CreateCompatibleDC(&dc); Dtt-|_EMS  
 CBitmap*pOld=tdc.SelectObject(&bm); P}@*Z>j:#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); a#y{pT2 b  
 tdc.SelectObject(pOld); 0`n 5x0R  
 BITMAP btm; El (/em  
 bm.GetBitmap(&btm); azX`oU,l  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )%VCzye*{  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); GV8)Kor%  
 BITMAPINFOHEADER bih; kA^A mfba  
 bih.biBitCount=btm.bmBitsPixel; a,n93-m(m  
 bih.biClrImportant=0; )GJP_*Ab  
 bih.biClrUsed=0; 2-mQt_ i  
 bih.biCompression=0; c'0 5{C  
 bih.biHeight=btm.bmHeight; 2~FPw{]j  
 bih.biPlanes=1; |I^y0Q:K  
 bih.biSize=sizeof(BITMAPINFOHEADER); !SF^a6jT  
 bih.biSizeImage=size; eYEc^nC,c)  
 bih.biWidth=btm.bmWidth; M|r8KW~S)  
 bih.biXPelsPerMeter=0; fsvYU0L  
 bih.biYPelsPerMeter=0; %v4ZGtKC@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Tpzw=bC^  
 static int filecount=0; w>vH8f  
 CString name; :Jl Di>B  
 name.Format("pict%04d.bmp",filecount++); Ttv'k*$cP  
 name=m_Path+name; uyT/Xzo3  
 BITMAPFILEHEADER bfh; Rp/-Pv   
 bfh.bfReserved1=bfh.bfReserved2=0; -H\,2FO  
 bfh.bfType=((WORD)('M'<< 8)|'B'); O2v.  
 bfh.bfSize=54+size; 5pJ*1pfeo  
 bfh.bfOffBits=54; R 1'`F{56  
 CFile bf; Df@/cT  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ u+2Lm*M  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2EfflZL3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "HC)/)Mv@  
  bf.WriteHuge(lpData,size); ({M?Q>s  
  bf.Close(); tcA;#^jc  
  nCount++; ~NNv>5 t5  
 }  O<GF>  
 GlobalFreePtr(lpData); O >FO>  
 if(nCount==1) Km*<Kfcz  
  m_Number.Format("%d picture captured.",nCount); lIh[|]  
 else ]y LhJ_^  
  m_Number.Format("%d pictures captured.",nCount); C3S`}o.  
  UpdateData(FALSE); =.b Y#4  
} $bGD%9 z  
 I=[cZ;t  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &&PgOFD  
{ 254~:eB0  
 if(pMsg -> message == WM_KEYDOWN) HmV /> 9  
 { GBbhar},g  
  if(pMsg -> wParam == VK_ESCAPE) DB@EVH  
   return TRUE; ;&,.TC?l  
  if(pMsg -> wParam == VK_RETURN) JD~aUB%  
   return TRUE; &71e5<(dG  
 }  (M`|'o!  
 return CDialog::PreTranslateMessage(pMsg); y $V[_TN  
} 2jA%[L9d^  
]US[5)EL-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yVS\Q,:J9  
{ Wsm`YLYkt!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ VPd,]]S5(  
  SaveBmp(); U CY2 ]E  
  return FALSE; )#`H."Z  
} AyTx'u  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ m;/i<:`  
 CMenu pop; FFe) e>bH  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m mw-a0  
 CMenu*pMenu=pop.GetSubMenu(0); tt4+m>/T  
 pMenu->SetDefaultItem(ID_EXITICON); #D)x}#V\  
 CPoint pt; }.{}A(^YR  
 GetCursorPos(&pt); 9;KJr[FQV  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); j|K.i/  
 if(id==ID_EXITICON) &U &%ka<*  
  DeleteIcon(); _/ Os^>R  
 else if(id==ID_EXIT) >. LKct*5K  
  OnCancel(); l`gTU?<xd  
 return FALSE; ]}LGbv"`A  
} xjq0D[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); VzwPBQ -  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) hz)9"B\S  
 AddIcon(); , Oli  
 return res; @vs@>CYdz  
} P(h5=0`*PR  
2p:r`THvS5  
void CCaptureDlg::AddIcon() ;V.vfar  
{ 3s(Ia^  
 NOTIFYICONDATA data; 2k1aX~?  
 data.cbSize=sizeof(NOTIFYICONDATA); z[&s5"  
 CString tip; ]k+m=OR{/  
 tip.LoadString(IDS_ICONTIP); k dU! kj  
 data.hIcon=GetIcon(0); @]'S eiNp  
 data.hWnd=GetSafeHwnd(); RJc%, ]:  
 strcpy(data.szTip,tip); ek)Xrp:2  
 data.uCallbackMessage=IDM_SHELL; 6/2v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; x / XkD]Hq  
 data.uID=98; R^P_{_I*"  
 Shell_NotifyIcon(NIM_ADD,&data); 8$}OS-  
 ShowWindow(SW_HIDE); 8/Rm!.8+~  
 bTray=TRUE; @@} `hii  
} L11L23:  
UK3a{O[ 5  
void CCaptureDlg::DeleteIcon() `WlE| G[  
{ 4}yE+dRUK:  
 NOTIFYICONDATA data; GLh]G(  
 data.cbSize=sizeof(NOTIFYICONDATA); |E|6=%^  
 data.hWnd=GetSafeHwnd(); SS8ocGX  
 data.uID=98; 3"rkko?A  
 Shell_NotifyIcon(NIM_DELETE,&data); Lk.h.ST  
 ShowWindow(SW_SHOW); 7B FN|S_l  
 SetForegroundWindow(); ;^-:b(E  
 ShowWindow(SW_SHOWNORMAL); p4mY0Y]mP  
 bTray=FALSE; ]T^ is>  
} 6 = gp:I  
Hg(5S,O2  
void CCaptureDlg::OnChange() y\[r(4h  
{ b5 Q NEi  
 RegisterHotkey(); nj2gs,k  
} h>3H7n.  
Hj~O49%j&  
BOOL CCaptureDlg::RegisterHotkey() 9<cOYY  
{ jXR16|  
 UpdateData(); SrZ50Se  
 UCHAR mask=0; ?q Xs-  
 UCHAR key=0; l3J$md|f  
 if(m_bControl) ;~/4d-  
  mask|=4; a [C&e,)}  
 if(m_bAlt) %v4 [{ =fE  
  mask|=2; \ 4gXY$`@  
 if(m_bShift) Y'N'hRD  
  mask|=1; {;k_!v{  
  key=Key_Table[m_Key.GetCurSel()]; (cs~@  
 if(bRegistered){ K`4GU[ul  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); GqUSVQ  
  bRegistered=FALSE; )%mAZk-*;^  
 } #s+Q{2s  
 cMask=mask; \A(5;ZnuD  
 cKey=key; zM59UQU;  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); r/AHJU3&eY  
 return bRegistered; +X^4; &  
}  aZgNPw  
{L9yhYw  
  四、小结 4<}A]BQVkJ  
"DjU:*'  
  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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