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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: [*)Z!)  
  btH _HE  
  一、实现方法 IS BV%^la|  
V  }>n  
  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: RsW9:*R  
Rs*v m  
#pragma data_seg("shareddata") $<|ocUC7  
HHOOK hHook =NULL; //钩子句柄 X eoJ$PfT  
UINT nHookCount =0; //挂接的程序数目 ;#TaZN  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 l?/Y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !Vheq3"q/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey k6!4Zz_8  
static int KeyCount =0; (DDyK[t+VX  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 C)Jn[/BD  
#pragma data_seg() ME^ ,'&  
EATu KLP\  
  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。 3$VxRz)  
3LDsxE=N:q  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: B6] <G-  
3xNMPm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Q$ri=uB;+  
cKey,UCHAR cMask) >`'O7.R  
{ e}0:"R%E  
 BOOL bAdded=FALSE; O oSb>Y/4  
 for(int index=0;index<MAX_KEY;index++){ A5fwAB  
  if(hCallWnd[index]==0){ /qU>5;  
   hCallWnd[index]=hWnd; k%P;w1  
   HotKey[index]=cKey; ~9=aT1S|  
   HotKeyMask[index]=cMask; w8iR|TV  
   bAdded=TRUE; @*MC/fe  
   KeyCount++; C5W>W4EM  
   break; b.F^vv"]]  
  } Vw#{C>  
 } :!fG; )=  
 return bAdded; *1{S*`|cJy  
} K>2#UzW  
//删除热键 AW,OH SXh6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uS+k^ #  
{ Bfr'Zdw  
 BOOL bRemoved=FALSE; F7MzCZvu  
 for(int index=0;index<MAX_KEY;index++){ ]XA4;7  
  if(hCallWnd[index]==hWnd){ ,FZT~?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 06*rWu9P3  
    hCallWnd[index]=NULL; xd-XWXc  
    HotKey[index]=0; 9}29&O  
    HotKeyMask[index]=0; BVw Wj-,  
    bRemoved=TRUE; 2+o |A  
    KeyCount--; &|Pu-A"5~  
    break; |J0Q,F]T  
   } k(%QIJH  
  } G{9X)|d  
 } l4y{m#/  
 return bRemoved; gRJfX %*F  
} |o<8}Nja6  
tMp=-"  
%Sk@GNI_  
  DLL中的钩子函数如下: 9\;|x  
7^*"O&y_al  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?BA^YF  
{ PX(p X>  
 BOOL bProcessed=FALSE; ?=;qK{)37  
 if(HC_ACTION==nCode) ^Q+i=y{W  
 { i/So6jW  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ]@^coj[  
   switch(wParam) 27F~(!n  
   {  Yw; D:Y(  
    case VK_MENU: 5 BtX63  
     MaskBits&=~ALTBIT; [5$w=u"j  
     break; QK`i%TXJ  
    case VK_CONTROL: P u0uKE  
     MaskBits&=~CTRLBIT; LjB;;&VCn  
     break; ,TJ D$^  
    case VK_SHIFT: ;z~n.0'  
     MaskBits&=~SHIFTBIT; nqVZqX@oE  
     break; kcie}Be  
    default: //judge the key and send message 8>WVodv  
     break; V DS23Bo  
   } D4JLtB'=  
   for(int index=0;index<MAX_KEY;index++){ TXXy\$  
    if(hCallWnd[index]==NULL) VOTv?Vf  
     continue; 7OCwG~_^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;Xvp6.:  
    { Mwp$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4*.K'(S5fx  
     bProcessed=TRUE; B[4pX +f  
    } {<>K]P~wD  
   } %ir:AS k  
  } Va VN  
  else if((lParam&0xc000ffff)==1){ //有键按下 in`aGFQO  
   switch(wParam) )6KMHG  
   { wd(Hv  
    case VK_MENU: !R-z%  
     MaskBits|=ALTBIT; s@hRqGd:  
     break; D}C,![   
    case VK_CONTROL: !QI\Fz?  
     MaskBits|=CTRLBIT; 8vSse  
     break; ^D`v3d  
    case VK_SHIFT: W1B)]IHc  
     MaskBits|=SHIFTBIT; KOz(TZ?u  
     break; 8X|r4otn4  
    default: //judge the key and send message l7{oi!   
     break; ^ci3F<?Q=  
   } 1?*  
   for(int index=0;index<MAX_KEY;index++){ 5}$b0<em~  
    if(hCallWnd[index]==NULL) ;Vik5)D2D  
     continue; VQ5nq'{v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D?yG+%&9  
    { 0$+fkDf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ps .]N   
     bProcessed=TRUE; bwM@/g%DL  
    } Io4(f  
   } @yXfBML?]  
  } ofYlR|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 rNjn~c  
   for(int index=0;index<MAX_KEY;index++){ ZQ^r`W9_ +  
    if(hCallWnd[index]==NULL) ^EG\iO2X  
     continue; 7@lS.w\#-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3kcTE&1^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /&F,V+x  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 W>VP'vn}  
   } :1XtvH  
  } /xGmg`g<#  
 } ~c)~015`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^<e@uNGg  
} ~_s?k3cd  
'TH15r@  
  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: 6hZ@;Q=b  
[gy*`@w  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T,xPSN2A*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -/{ 4Jf Wf  
x3qW0K8  
  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: pj4!:{.;  
-C(b,F%%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9% l%  
{ #ET/ =  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 8]4U`\k4  
 { A;\ 7|'4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Q#h 9n]5  
  SaveBmp(); &B! o,qp  
  return FALSE; I$E.s*B9  
 } ~%?`P/.o  
 …… //其它处理及默认处理 ]EwVpvTw  
} |-V&O=!^+  
J psPNa  
O+ }qQNe<  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 `wF8k{Pb  
WDFjp  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 pdJ/&ufh  
;nC.fBu  
  二、编程步骤 ?4H i-  
it]E-^2>  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; MlLb|!,)T  
|FD}e)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; /Q~gU<  
A,r*%&4~  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; vad12WrG<  
x.8TRMk^  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; CPg+f1K  
f2,jh}4  
  5、 添加代码,编译运行程序。 >pU:Gr  
cUTE$/#s  
三、程序代码 %QKZT=}  
#2r}?hP/m  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL GA7}K:LP'k  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Y0 D}g3`  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ aK`@6F,]j  
#if _MSC_VER > 1000 atXS-bg*  
#pragma once cZ)}LX  
#endif // _MSC_VER > 1000 DW)2 m;  
#ifndef __AFXWIN_H__ DJgTA]$&  
#error include 'stdafx.h' before including this file for PCH b~nAPY6  
#endif OKF tl  
#include "resource.h" // main symbols dCj,b$  
class CHookApp : public CWinApp yHxosxd<*  
{ | 9~GM  
 public: H[DUZ,J  
  CHookApp(); >A@Y$.  
  // Overrides $Of0n` e  
  // ClassWizard generated virtual function overrides #j *d^j&  
  //{{AFX_VIRTUAL(CHookApp) vN3Zr34  
 public: Oft4- 4$E  
  virtual BOOL InitInstance(); ]E]2o  
  virtual int ExitInstance(); E ;<l(.Ar  
  //}}AFX_VIRTUAL  o x+ 3U  
  //{{AFX_MSG(CHookApp) >y Y'7Ey  
  // NOTE - the ClassWizard will add and remove member functions here. gi 0W;q  
  // DO NOT EDIT what you see in these blocks of generated code ! 0P\$ 2lk  
  //}}AFX_MSG Z*-g[8FO  
  DECLARE_MESSAGE_MAP() S[7WW$lF  
}; TDd{.8qf  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6xD#?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s}N#n(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); * S=\l@EW  
BOOL InitHotkey(); Ur*6Gi6  
BOOL UnInit(); %/9 EORdeH  
#endif v@e~k-#  
qhT@;W/X  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 7O, U?p  
#include "stdafx.h" JPGzrEaZ  
#include "hook.h" ,=l7:n  
#include <windowsx.h> tU_y6  
#ifdef _DEBUG 2(/g}  
#define new DEBUG_NEW i+gQE!  
#undef THIS_FILE ezPz<iZ\N  
static char THIS_FILE[] = __FILE__; v%fu  
#endif $V1;la!  
#define MAX_KEY 100 K~22\G`  
#define CTRLBIT 0x04 uL[.ND2._&  
#define ALTBIT 0x02 ei rzYt  
#define SHIFTBIT 0x01 To?W?s  
#pragma data_seg("shareddata") bT&: fHc  
HHOOK hHook =NULL; AE} )o)B  
UINT nHookCount =0; /% N r?V  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey EY \H=@A  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT JGuN:c$  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey %'[&U#-  
static int KeyCount =0; 1 5A*7|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift _Gu- uuy  
#pragma data_seg() n5{Xj:}  
HINSTANCE hins; .nyfYa+  
void VerifyWindow(); 1&e} ms  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) h[PYP5{L  
//{{AFX_MSG_MAP(CHookApp) }fKSqB]T-  
// NOTE - the ClassWizard will add and remove mapping macros here. +zy=50,   
// DO NOT EDIT what you see in these blocks of generated code! D}v mwg@3  
//}}AFX_MSG_MAP gB<3-J1R  
END_MESSAGE_MAP() 9Lr'YRl[W  
rD*sl}  
CHookApp::CHookApp() y K"kEA[;  
{ XP@1~$  
 // TODO: add construction code here, 8stwg'  
 // Place all significant initialization in InitInstance =9j8cC5y  
} _)\c&.p]f  
s>^dxF!+  
CHookApp theApp; e [8LmuIZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) v'e[GB 0  
{ ;X?mmv'  
 BOOL bProcessed=FALSE; X,LD   
 if(HC_ACTION==nCode) `\+@Fwfx  
 { 7e<c$t#H  
  if((lParam&0xc0000000)==0xc0000000){// Key up p ZZc:\fJ  
   switch(wParam) _r2J7&  
   { 7^g&)P  
    case VK_MENU: x:QgjK  
     MaskBits&=~ALTBIT; 2 aL)  
     break; mQY_`&Jq  
    case VK_CONTROL: e#E2>Bj;  
     MaskBits&=~CTRLBIT; VqS#waNrx  
     break; kcQ'$<Mz<  
    case VK_SHIFT: n/h,Lr)Z  
     MaskBits&=~SHIFTBIT; %?m$`9yU  
     break; b?Ki;[+O  
    default: //judge the key and send message {Lm~r+ U  
     break; &\Amn?Iq  
   } ?.YOI.U^  
   for(int index=0;index<MAX_KEY;index++){ sq;s]@~  
    if(hCallWnd[index]==NULL) :hM/f  
     continue; G>q(iF'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /RMPS. d {  
    { `(3/$%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); SI=yI-  
     bProcessed=TRUE; v;0|U:`]  
    } 5Lf{8UxI  
   } (`:O~>[N  
  } J.8IwN1E  
  else if((lParam&0xc000ffff)==1){ //Key down xe*aC  
   switch(wParam) AW,53\ 0  
   { A]DTUdL  
    case VK_MENU: 0$-xw  
     MaskBits|=ALTBIT; HvVts\f  
     break; fXcm|U,ho  
    case VK_CONTROL: Lliq j1&  
     MaskBits|=CTRLBIT; k70|'*Kh  
     break; B` k\EL'  
    case VK_SHIFT: E>}4$q[r  
     MaskBits|=SHIFTBIT; X_7UJ jFw"  
     break; qs QNjt  
    default: //judge the key and send message +Xemf?  
     break; OD5m9XS  
   } &cu lbcz  
   for(int index=0;index<MAX_KEY;index++) )4&cph';  
   { ~t~-A,1  
    if(hCallWnd[index]==NULL) oIefw:FE,a  
     continue; WH= EPOR,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u&n' ITH  
    { uh?>- ]r`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }6@pJ G  
     bProcessed=TRUE; $k2*[sn,  
    } c.j$9=XLBG  
   } ,JEF GI{  
  } '60 L~`K  
  if(!bProcessed){ K5XK%Gl"  
   for(int index=0;index<MAX_KEY;index++){ $bsG]  
    if(hCallWnd[index]==NULL) ]X^rU`":  
     continue; t8dm)s[r8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) IqD_GL)Ms  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); M-giR:,  
   } `3hSL R  
  } |0%+wB  
 } X3V'Cy/sy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6C+"`(u%V  
} ) lZp9O  
dx+hhg\L  
BOOL InitHotkey() _C`K*u 6Z<  
{ sUU{fNC6|  
 if(hHook!=NULL){ zNIsf "  
  nHookCount++; 1SR+m>pL  
  return TRUE; r}jGUe}d  
 } gwWN%Z"  
 else >b]S3[Q(  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); dtc IC0:[  
  if(hHook!=NULL) 6#QK%[1!>  
   nHookCount++; Qu]z)";7  
  return (hHook!=NULL); 4'LB7}WG  
} mD/MJt5  
BOOL UnInit() 6CMub0   
{ "1HRLci  
 if(nHookCount>1){ nVI! @qW  
  nHookCount--; E,f>1meN=  
  return TRUE; l!g]a2x*  
 } $.[#0lCI  
 BOOL unhooked = UnhookWindowsHookEx(hHook); kVy\b E0o  
 if(unhooked==TRUE){ a@0BBihz  
  nHookCount=0; 6%VV,$p  
  hHook=NULL; =F;.l@:  
 } :bC40@  
 return unhooked; A21N|$[  
} YR;^hs?  
<E0UK^-}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |USX[j m\  
{ J|w)&bV  
 BOOL bAdded=FALSE; m:/ wG& !  
 for(int index=0;index<MAX_KEY;index++){ MC { 2X  
  if(hCallWnd[index]==0){ 6l4mS~/  
   hCallWnd[index]=hWnd; ]| +<P-  
   HotKey[index]=cKey; 91xB9k1zO  
   HotKeyMask[index]=cMask; qvv2O1c"A  
   bAdded=TRUE; r{rQu-|.  
   KeyCount++; Uv4`6>Ix  
   break; HO' '&hz  
  } [ l8jRT=R  
 } 3hK#'."`N  
 return bAdded; 8 P>#l.#  
} P:N1#|g  
0s>/mh;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) | a# f\  
{ Q;D0<Bv  
 BOOL bRemoved=FALSE; U_{Ux 2  
 for(int index=0;index<MAX_KEY;index++){ <!pvqNApg  
  if(hCallWnd[index]==hWnd){ <bD>m[8,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ EVNY*&p  
    hCallWnd[index]=NULL; L^{|uP15N  
    HotKey[index]=0; '_$uW&{NI  
    HotKeyMask[index]=0; h)Ff2tX  
    bRemoved=TRUE; !0dNQ[$82  
    KeyCount--; A+UU~?3y  
    break; ?K3(D;5 &i  
   } Rv/Bh< t  
  } zrU{@z$l  
 } Usta0Ag  
 return bRemoved; uZ=NSbYsA  
} H/"lAXfb  
v%RP0%%{s  
void VerifyWindow() 3dDX8M?  
{ kn/Ao}J74z  
 for(int i=0;i<MAX_KEY;i++){ YXI'gn2b#  
  if(hCallWnd!=NULL){ l3IWoa&sh  
   if(!IsWindow(hCallWnd)){ Y!T %cTK)a  
    hCallWnd=NULL; }YHX-e<Yx]  
    HotKey=0; lbuAE%  
    HotKeyMask=0; Y X_ gb/A  
    KeyCount--; v$ub~Q6W  
   } pm6>_Kz  
  } k{<,\J  
 } ;-Jb1"5  
} ScSZGs 5&  
ru7RcYRq  
BOOL CHookApp::InitInstance() V$uk6#  
{ %H+\>raLz  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); b%Eei2Gm%  
 hins=AfxGetInstanceHandle(); >B>CB3U  
 InitHotkey(); BY]i;GVq  
 return CWinApp::InitInstance(); A3ZY~s#Iv  
} YQS5P#  
i>joT><B  
int CHookApp::ExitInstance() z-c}NdW  
{ N72Yq)(  
 VerifyWindow(); L =8+_0  
 UnInit(); )<xypDQ  
 return CWinApp::ExitInstance(); &< !Ufa&  
} 2r 6'O6v  
A'%1ZQ33O  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hbc uK&  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \fjMc }'  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ dqX;#H}h  
#if _MSC_VER > 1000 X~xd/M=9^  
#pragma once Jx=hJ-FY  
#endif // _MSC_VER > 1000 2mq$H_  
L-9~uM3@\  
class CCaptureDlg : public CDialog ys#i@  
{ M1%Dg'}G  
 // Construction _A0mxq  
 public: J=dJs k   
  BOOL bTray; /QEiMrz@6  
  BOOL bRegistered; 1* ]Ev  
  BOOL RegisterHotkey(); Q*XE h  
  UCHAR cKey; q}FVzahv  
  UCHAR cMask; aBzszp]l+  
  void DeleteIcon(); @+WQ ^  
  void AddIcon(); w\19[U3  
  UINT nCount; u1c%T@w>Lz  
  void SaveBmp(); U-^[lWn[@4  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor tM#lFmdd\P  
  // Dialog Data @;?T~^nGj  
  //{{AFX_DATA(CCaptureDlg) dHk{.n^p  
  enum { IDD = IDD_CAPTURE_DIALOG }; GTJ{h  
  CComboBox m_Key; {bPV)RL:  
  BOOL m_bControl; HQ9X7[3  
  BOOL m_bAlt; rP(eva  
  BOOL m_bShift; !(t,FYeH  
  CString m_Path; ]1gx#y 2  
  CString m_Number; YKa0H%B(  
  //}}AFX_DATA ~j'l.gQb  
  // ClassWizard generated virtual function overrides "p3_y`h6+  
  //{{AFX_VIRTUAL(CCaptureDlg) 9TAj) {U%'  
 public: SI6B#u-i  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  P5gN#G  
 protected: [+Y{%U  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Bu]t*$  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); emW:C-/h/@  
  //}}AFX_VIRTUAL v~/~ @jv  
  // Implementation d HJhFw  
 protected: 9*:gr#(5  
  HICON m_hIcon; (7DXRcr<  
  // Generated message map functions 5ZY)nelc  
  //{{AFX_MSG(CCaptureDlg) _xLHrT!y  
  virtual BOOL OnInitDialog(); X1vNF|o~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); HBB{m  
  afx_msg void OnPaint(); DS xUdEK6  
  afx_msg HCURSOR OnQueryDragIcon(); .6~`Ubr}E  
  virtual void OnCancel(); **>/}.%?K  
  afx_msg void OnAbout(); 1w"8~Z:UXV  
  afx_msg void OnBrowse(); g`>og^7g  
  afx_msg void OnChange(); R3X{:1{j  
 //}}AFX_MSG {w <+_++  
 DECLARE_MESSAGE_MAP() pZZf[p^s|  
}; c={Ft*N  
#endif HWm#t./  
 2Cg$,#H  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4m-I5!=O  
#include "stdafx.h" 8by@iQ  
#include "Capture.h" U,Mx@KdV  
#include "CaptureDlg.h" D?M!ra  
#include <windowsx.h> C;~*pMAYe  
#pragma comment(lib,"hook.lib") $Q+s/4\  
#ifdef _DEBUG wLV~F[:  
#define new DEBUG_NEW ~l~Tk6EM  
#undef THIS_FILE B[9 (FRX  
static char THIS_FILE[] = __FILE__; PNeh#PI 6)  
#endif <:|3rfm#  
#define IDM_SHELL WM_USER+1 tU/k-W3X  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q:8_]Qt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); voe7l+Xk  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; F%rHU5CkV  
class CAboutDlg : public CDialog yA[({2%  
{ Pj?Dmk~   
 public: 0qFH s  
  CAboutDlg(); j 6ut}Uq  
  // Dialog Data B%\gkl  
  //{{AFX_DATA(CAboutDlg) 5HS~op2n/  
  enum { IDD = IDD_ABOUTBOX }; q*)+K9LRk  
  //}}AFX_DATA OJ4SbI  
  // ClassWizard generated virtual function overrides Wn|&cG9  
  //{{AFX_VIRTUAL(CAboutDlg) xdy^ ^3"  
 protected: smQVWs>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _;RVe"tR#  
  //}}AFX_VIRTUAL {I{:GcS  
  // Implementation ,572n[-q  
 protected: X%9*O[6{  
  //{{AFX_MSG(CAboutDlg) 4F MAz^  
  //}}AFX_MSG Br d,Eg  
  DECLARE_MESSAGE_MAP() Cz^Q5F`  
}; fYrGpW( `  
(ozb%a#B  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) o5aLU Wi-  
{ c3 &m9zC  
 //{{AFX_DATA_INIT(CAboutDlg) ;pRcVL_4  
 //}}AFX_DATA_INIT [*m2  
} $(q>mg:H  
C+N F9N  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {w^uWR4f  
{ jQj,q{eA  
 CDialog::DoDataExchange(pDX); E&~nps8e  
 //{{AFX_DATA_MAP(CAboutDlg) uM(UO,X  
 //}}AFX_DATA_MAP "zZI S6j  
} 3,aN8F1;C  
y~<@x.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) dv N<5~  
 //{{AFX_MSG_MAP(CAboutDlg) ;9uRO*H?T  
 // No message handlers ~=y3Gd B3  
 //}}AFX_MSG_MAP o!&W sD  
END_MESSAGE_MAP() }lZ>  
yy(A(}  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) bb=uF1  
: CDialog(CCaptureDlg::IDD, pParent) F#+.>!  
{ X21dX`eMN  
 //{{AFX_DATA_INIT(CCaptureDlg) 84&XW  
  m_bControl = FALSE; ~y0R'oi  
  m_bAlt = FALSE; uL?vG6% ^1  
  m_bShift = FALSE; 7]2 2"mc  
  m_Path = _T("c:\\"); d @rs3Q1z  
  m_Number = _T("0 picture captured."); 'qv;sB.  
  nCount=0; k<4P6?  
  bRegistered=FALSE; 19d6]pJ5  
  bTray=FALSE; `Xo 4q3  
 //}}AFX_DATA_INIT XY+y}D %  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 X,v4d~>]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); msk/p>{O  
} yi!`V.  
keqcV23k  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) >[*4Tjg  
{ %(LvE}[RJ  
 CDialog::DoDataExchange(pDX); Ygkv7>?,  
 //{{AFX_DATA_MAP(CCaptureDlg) </E>tMW  
  DDX_Control(pDX, IDC_KEY, m_Key); ^abD !8  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); i</J@0}y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 'dt\db5p  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 4Nmea-!*  
  DDX_Text(pDX, IDC_PATH, m_Path); ( v#pj8aE  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Rs$5PdH  
 //}}AFX_DATA_MAP &/ ouW'oP  
} !E& MBAKy  
=l`OHTg  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) W8aU "_  
//{{AFX_MSG_MAP(CCaptureDlg) xRX>|S  
 ON_WM_SYSCOMMAND() >#N[GrJAE  
 ON_WM_PAINT() YL^Z4: p  
 ON_WM_QUERYDRAGICON() XizPMN5a  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) LD55n%|0`H  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) FrZ]=:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) p#H]\ P'  
//}}AFX_MSG_MAP v$$]Gv(  
END_MESSAGE_MAP() m@ oUvxcd  
d5U; $q{o  
BOOL CCaptureDlg::OnInitDialog()  93w~.p  
{ 5()Fvae{k  
 CDialog::OnInitDialog(); k90B!kg  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); J_  V,XO  
 ASSERT(IDM_ABOUTBOX < 0xF000); zLek& s&-  
 CMenu* pSysMenu = GetSystemMenu(FALSE); FDLd&4Ex  
 if (pSysMenu != NULL) Y%IJ8P^Y  
 { G :4;y7  
  CString strAboutMenu; ,$Tk$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ndOfbu;mf  
  if (!strAboutMenu.IsEmpty()) D<nxr~pQ  
  { !A[S6-18%-  
   pSysMenu->AppendMenu(MF_SEPARATOR); c#\-%h  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); a c6*v49  
  } ~Fx&)kegTo  
 } iVeQ]k(u  
 SetIcon(m_hIcon, TRUE); // Set big icon ="B n=>  
 SetIcon(m_hIcon, FALSE); // Set small icon .5g}rxO8  
 m_Key.SetCurSel(0); Kpg:yrc['  
 RegisterHotkey(); oBw}hH,hp  
 CMenu* pMenu=GetSystemMenu(FALSE); n>llSK  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +"L$ed(=nJ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "=A|K~b  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); B| Q6!  
 return TRUE; // return TRUE unless you set the focus to a control 5\G)Q<A]*L  
} ]_2 yiKv&  
u33zceE8  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) UB&2f>  
{ :QKb#4/8;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) j) 6G7T|  
 { WEVl9]b'e+  
  CAboutDlg dlgAbout; ^K*-G@B  
  dlgAbout.DoModal(); _$(GRNRYK  
 } ve%l({  
 else X>/K/M  
 { 46dc.Yi  
  CDialog::OnSysCommand(nID, lParam); dzxI QlP  
 } r{V.jZ%p'Z  
} h[H%:743  
Ej|A ; &E  
void CCaptureDlg::OnPaint() m0Z7N5v)  
{ %O/d4  
 if (IsIconic()) 5&qY3@I7l  
 { #PH#2/[  
  CPaintDC dc(this); // device context for painting ]BfR.,,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); T?e9eYwS  
  // Center icon in client rectangle k5s?lWH  
  int cxIcon = GetSystemMetrics(SM_CXICON); ;fx1!:;.  
  int cyIcon = GetSystemMetrics(SM_CYICON); +:y&{K  
  CRect rect; 08io<c,L  
  GetClientRect(&rect); L?.7\a@  
  int x = (rect.Width() - cxIcon + 1) / 2; lE a W7j  
  int y = (rect.Height() - cyIcon + 1) / 2; acP ;(t  
  // Draw the icon DvJB59:_}  
  dc.DrawIcon(x, y, m_hIcon); j]HE>  
 } ;/aB)JZ5=  
 else &oc_ a1 R  
 { 5m 3'Gt4  
  CDialog::OnPaint(); P#F_>GB  
 } r\bq[9dX>  
} <O bHf`Q  
{]@Qu"M  
HCURSOR CCaptureDlg::OnQueryDragIcon() -3`Isv  
{ )(.%QSA\C  
 return (HCURSOR) m_hIcon; X}?ESjZJ  
} (NM6micc  
<>&89E%j'  
void CCaptureDlg::OnCancel() !?n50  
{ 7BK46x  
 if(bTray) 776 nWw)  
  DeleteIcon(); !*8#jy  
  CDialog::OnCancel(); PAr|1i)mB  
} .f+9 A>  
RSFJu\0}N  
void CCaptureDlg::OnAbout() jDJ.  
{ *XOS.$zGz  
 CAboutDlg dlg; VlV)$z_  
 dlg.DoModal(); w. vY(s  
} UCn.t  
5{HtJ?sKc5  
void CCaptureDlg::OnBrowse() 6s&qZ+v-  
{ { $X X  
 CString str; Jtpa@!M  
 BROWSEINFO bi; LEA;dSf  
 char name[MAX_PATH]; &E`9>&~J  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); T[m ~6  
 bi.hwndOwner=GetSafeHwnd(); at=D&oy4"+  
 bi.pszDisplayName=name; <gR`)YF7  
 bi.lpszTitle="Select folder"; TXx'7[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; yX3PUO9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); O<bDU0s{M  
 if(idl==NULL) xdCs5ko  
  return; G~O" /WM  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); M,ppCHy/$  
 str.ReleaseBuffer(); vB=;_=^i 1  
 m_Path=str; $e>/?Ss  
 if(str.GetAt(str.GetLength()-1)!='\\') AmgWj/>  
  m_Path+="\\"; 'G52<sF  
 UpdateData(FALSE); #i@ACAgn;6  
} HKM~BL "X  
t2Ip\>;9f  
void CCaptureDlg::SaveBmp() p|b+I"M  
{ dEL3?-;'  
 CDC dc; 5Zzr5 WM  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); n#)PvV~  
 CBitmap bm; ]v<d0" 2  
 int Width=GetSystemMetrics(SM_CXSCREEN); CGCQa0  
 int Height=GetSystemMetrics(SM_CYSCREEN); u0wn=Dg  
 bm.CreateCompatibleBitmap(&dc,Width,Height); S3b|wUf  
 CDC tdc; (21']x  
 tdc.CreateCompatibleDC(&dc); zUNH8=U  
 CBitmap*pOld=tdc.SelectObject(&bm); 10/x'#(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Q%+ }  
 tdc.SelectObject(pOld); #aj|vox}  
 BITMAP btm; Ii,~HH  
 bm.GetBitmap(&btm); fm[_@L% x  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; v/]Qq  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); l t&$8jh  
 BITMAPINFOHEADER bih; OTnu{<.a  
 bih.biBitCount=btm.bmBitsPixel; r[6#G2  
 bih.biClrImportant=0; U.HoFf+HN  
 bih.biClrUsed=0; .MzOLv   
 bih.biCompression=0; mu 2 A%"7  
 bih.biHeight=btm.bmHeight; z|Hy>|+  
 bih.biPlanes=1; m*\B2\2gJ  
 bih.biSize=sizeof(BITMAPINFOHEADER); f2`P8$U)R  
 bih.biSizeImage=size; B{[f}h.n  
 bih.biWidth=btm.bmWidth; R|nEd/' <  
 bih.biXPelsPerMeter=0; ~?2rGE  
 bih.biYPelsPerMeter=0; #Tup]czO  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); dK[*  
 static int filecount=0; _{[k[]  
 CString name; MV% :ES?  
 name.Format("pict%04d.bmp",filecount++); M ' a&  
 name=m_Path+name; GU:r vS!  
 BITMAPFILEHEADER bfh; BhOXXa{B  
 bfh.bfReserved1=bfh.bfReserved2=0; @^'G&%j  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &G0l&8pa  
 bfh.bfSize=54+size; 0m]~J_   
 bfh.bfOffBits=54; A*G )CG  
 CFile bf; oNiToFbQu  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ JZW gr&O<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (y-x01H  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <WZ1-  
  bf.WriteHuge(lpData,size); -q'xC:m  
  bf.Close(); ?SB[lbU  
  nCount++;  $&ex\_W  
 } sI^@A=.@  
 GlobalFreePtr(lpData); $,8CH)w  
 if(nCount==1) Y1#-^,qg  
  m_Number.Format("%d picture captured.",nCount); c-[Q,c  
 else aQl?d<|+lk  
  m_Number.Format("%d pictures captured.",nCount); MZ;"J82p  
  UpdateData(FALSE); ,Wz[tYL*  
} 6U;Jg_zS  
N$N;Sw  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5%2ef{T[  
{ |WD,\=J2  
 if(pMsg -> message == WM_KEYDOWN) 6V.awg,  
 { w{_e"N  
  if(pMsg -> wParam == VK_ESCAPE) 2$o2.$i81  
   return TRUE; L@)b%Q@a  
  if(pMsg -> wParam == VK_RETURN) E}xz7u   
   return TRUE; =-OCM*5~S  
 } ?2J S&i  
 return CDialog::PreTranslateMessage(pMsg); %E4$ZPSW  
} B, QC -Tn  
dH ^b)G4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hEyX~f  
{ P@gu~!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ DBu)xr}7A  
  SaveBmp(); 5W?yj>JR  
  return FALSE; s[0prm5.  
} 5QqJ I#4~  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ()+jrrK  
 CMenu pop; G=r(SJq  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); wc<2Uc  
 CMenu*pMenu=pop.GetSubMenu(0); 3Ew"[FUs  
 pMenu->SetDefaultItem(ID_EXITICON); 4FfwpO3,Ku  
 CPoint pt; k7z(Gbzu   
 GetCursorPos(&pt); u\Nw:Uu i  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); "'Q"(S  
 if(id==ID_EXITICON) kr/1Dsr4  
  DeleteIcon(); {u(}ED#p  
 else if(id==ID_EXIT) x?k  
  OnCancel(); A^T~@AO  
 return FALSE; SX_kr^#  
} <6d{k[7fz)  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )z ?&" I  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) WU+Jo@]y  
 AddIcon(); >)AE |j`  
 return res; /tId#/Y  
} Ev$-P X  
;[WSf{k  
void CCaptureDlg::AddIcon() O4b-A3:  
{ R` I8Ud4=  
 NOTIFYICONDATA data; N=O+X~  
 data.cbSize=sizeof(NOTIFYICONDATA); )rs|=M=Xk  
 CString tip; f{+LCMbC6  
 tip.LoadString(IDS_ICONTIP); H 'WFORso[  
 data.hIcon=GetIcon(0); !T#8N7J>  
 data.hWnd=GetSafeHwnd(); /ygUd8@  
 strcpy(data.szTip,tip); >,] eL  
 data.uCallbackMessage=IDM_SHELL; `>`K7-H  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .236d^l  
 data.uID=98; 4'}_qAT  
 Shell_NotifyIcon(NIM_ADD,&data); v$.JmL0^J  
 ShowWindow(SW_HIDE); "lv:hz  
 bTray=TRUE; 1OiZNuI:E  
} j{7ilo(i  
NE=#5?6%g7  
void CCaptureDlg::DeleteIcon() _Cv[`e.  
{ *uI hxMX  
 NOTIFYICONDATA data; K-"HcHuF  
 data.cbSize=sizeof(NOTIFYICONDATA); 3zA8pI w  
 data.hWnd=GetSafeHwnd(); V<~_OF  
 data.uID=98; c]g<XVI  
 Shell_NotifyIcon(NIM_DELETE,&data); >'2w\Uk~:  
 ShowWindow(SW_SHOW); UgnsV*e&  
 SetForegroundWindow(); /QV. U.>G  
 ShowWindow(SW_SHOWNORMAL); SBN_>;$c5}  
 bTray=FALSE; V(' 'p{  
} ig.6[5a\  
.^)C:XiW  
void CCaptureDlg::OnChange() LAK-!!0X  
{ @??c<]9F  
 RegisterHotkey(); }0Kqy;  
} U'h[ {ek  
)L(d$N=Bd  
BOOL CCaptureDlg::RegisterHotkey() vs'L1$L'c  
{ SSL%$:l@  
 UpdateData(); b68G&z>   
 UCHAR mask=0; V\rIN}7  
 UCHAR key=0; f@F^W YQm  
 if(m_bControl) `:bvuc(  
  mask|=4; ~ ];6hxv  
 if(m_bAlt) 9(N)MT5F  
  mask|=2; >arO$|W  
 if(m_bShift) $3]E8t  
  mask|=1; "zeJ4f  
  key=Key_Table[m_Key.GetCurSel()]; {-v\&w  
 if(bRegistered){ >jrz;r  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :m)Rmwn_  
  bRegistered=FALSE; 9 .&Or4>  
 } :,}:c%-^"  
 cMask=mask; nuQLq^e  
 cKey=key; _#^A:a^e8  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  'QekQ];  
 return bRegistered; FSYjp{z5  
} @]ptY*   
%<ptkZK#  
  四、小结 Wf`Oye Rz  
zfr(dQ  
  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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