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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: vezX/xD?  
  8]'qJ;E2  
  一、实现方法 l*b3Mg  
w+*Jl}&\  
  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: nOp\43no  
BWfsk/lej  
#pragma data_seg("shareddata") D]Bvjh   
HHOOK hHook =NULL; //钩子句柄 /< h~d  
UINT nHookCount =0; //挂接的程序数目 |HhUU1!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 h6 8sQd  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 U]d{hY."  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey LF{d'jJ&K  
static int KeyCount =0; MU%C_d%.  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -~]*)&  
#pragma data_seg() qmv%N  
Da)9s %_4  
  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。 &37QUdp+p  
}_:^&cT  
  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: IGOqV>;  
j01#Wq_\fk  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ]rXRon='  
cKey,UCHAR cMask) W?5^cEF  
{ qZG "{8  
 BOOL bAdded=FALSE; Abd&p N  
 for(int index=0;index<MAX_KEY;index++){ !1w=_  
  if(hCallWnd[index]==0){ P*)}ENY  
   hCallWnd[index]=hWnd; ^)D[ W(*  
   HotKey[index]=cKey; _l{G Hz  
   HotKeyMask[index]=cMask; .E"hsGH9h  
   bAdded=TRUE; NuLQkf)  
   KeyCount++; 28>gAz.#  
   break; FF)F%o+:w  
  } aj|I[65  
 } /mo4Q?^  
 return bAdded; (9{)4[3MAG  
} &v'e;W  
//删除热键 V)f/umT%g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +tES:3Pi  
{ =Y?M#3P.I  
 BOOL bRemoved=FALSE; Y u8a8p|  
 for(int index=0;index<MAX_KEY;index++){ _<yJQ|[z~i  
  if(hCallWnd[index]==hWnd){ _U|s!60'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p4*VE5[?_+  
    hCallWnd[index]=NULL; xQ-]Iw5  
    HotKey[index]=0; Jp=ur)Dj  
    HotKeyMask[index]=0; +F]X  
    bRemoved=TRUE; sas;<yh  
    KeyCount--; (6L[eWuTn  
    break; 0 x4p!5  
   } GxuFO5wz  
  } sFT-aLpL@V  
 } R%"wf   
 return bRemoved; r**u=q %p  
} 4S`2")V  
Fi14_{  
[x kbzJ  
  DLL中的钩子函数如下: #9F=+[L  
F%UyFUz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) N~=p+Ow[H  
{ ts<5%{M(  
 BOOL bProcessed=FALSE; CC;T[b&  
 if(HC_ACTION==nCode) c0sU1:e0  
 { t$m268m~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 y9cW&rDH  
   switch(wParam) hl(M0cxEWP  
   {  ' jf$3  
    case VK_MENU: "W?<BpV~@!  
     MaskBits&=~ALTBIT; +ng8!k  
     break; )[.FUx  
    case VK_CONTROL: $8kc1Q  
     MaskBits&=~CTRLBIT; G&I\Za;   
     break; C4 H M  
    case VK_SHIFT: y)0r%=  
     MaskBits&=~SHIFTBIT; -R?~Yysd7K  
     break; +[<|TT  
    default: //judge the key and send message 7q&Ru|T33  
     break; .z^ePZ|mV  
   } zYvf}L&]h  
   for(int index=0;index<MAX_KEY;index++){ 8$xd;+`y'  
    if(hCallWnd[index]==NULL) mJ2>#j;5f  
     continue; u]lf~EE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ghs{B8  
    { C!6?.\U/:c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P:eY>~m<;  
     bProcessed=TRUE; q"7rd?r52  
    } D(yU:^L  
   } PHU#$LG  
  } bS=aFl#  
  else if((lParam&0xc000ffff)==1){ //有键按下 ] lE6:^V  
   switch(wParam) 3xj ?}o  
   { JL5 )  
    case VK_MENU: C_mPw  
     MaskBits|=ALTBIT; a/A$ MXZ_  
     break; J!b v17H"  
    case VK_CONTROL: Q*u4q-DE  
     MaskBits|=CTRLBIT; )kfj+/  
     break; Km7HB!=<  
    case VK_SHIFT: 1:h{( %`&  
     MaskBits|=SHIFTBIT; 56T<s+X>  
     break; kq&xH;9=.  
    default: //judge the key and send message q+<X*yC  
     break; ~xZFm  
   } vPz$jeA  
   for(int index=0;index<MAX_KEY;index++){ "xe %  IS  
    if(hCallWnd[index]==NULL) l*V]54|ON3  
     continue; t}n:!v"|+O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $$ma1.t"  
    { ca%s$' d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #usi1UWB#Q  
     bProcessed=TRUE; :y^0]In  
    } 'id] <<F  
   } p uEu v6F  
  } iOXxxP%#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ^Tgu]t   
   for(int index=0;index<MAX_KEY;index++){ K:hZ  
    if(hCallWnd[index]==NULL) JR>#PJ,N-  
     continue; \X1?,gV_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q}zAC2@L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /UtCJMQ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Sqw:U|h\FS  
   } 2Hl0besm  
  } I-<U u 2  
 } s$Z zS2d  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); xXkP(^ Y  
} VUAW/  
8@ y@}  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: KKB&)R  
X!#rw= Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b|F4E{{D^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g$$i WC!S<  
M#ED49Dh>  
  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_mdX9-~  
U-!+Cxjs  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Zt;3HY=y  
{ B'<k*9=Nv8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) [\+"<;m$  
 { GIG\bQSv2  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 z !2-U  
  SaveBmp(); Y7{|iw(#  
  return FALSE; ]'+PJdA  
 } c4H5[LPF  
 …… //其它处理及默认处理 _nW{Q-nh  
} a k&G=a6^  
vU= +  
O_-Lm4g?4  
  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。 ixc~DV+@[  
G- nS0Kn:  
  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。 %A_h!3f&  
bn$a7\X-  
  二、编程步骤 ffDh 0mDN  
wyG7SA   
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; od\-o:bS  
BOqu$f+  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; b7;`A~{9v  
"%^T~Z(_j  
  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; jFAnhbbCE  
LcL|'S)  
  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; "`WcE/(  
A6-K~z^  
  5、 添加代码,编译运行程序。  M18<d1*  
L>:YGM"sL  
三、程序代码 D3,9X#B=  
fH{ _X  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5ZpU><y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) abAX)R'  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ W:5,zFW  
#if _MSC_VER > 1000 l6kqP  
#pragma once )g;*u,C  
#endif // _MSC_VER > 1000 {DfXn1Cg0U  
#ifndef __AFXWIN_H__ FZdZGK  
#error include 'stdafx.h' before including this file for PCH CG!7BP\  
#endif {k:W?`  
#include "resource.h" // main symbols VSf<(udGr  
class CHookApp : public CWinApp Ky:y1\K1^K  
{ mQ~0cwo)  
 public: v>S[} du  
  CHookApp(); VR:4|_o  
  // Overrides &:Mk^DH5  
  // ClassWizard generated virtual function overrides [22>)1<(  
  //{{AFX_VIRTUAL(CHookApp) _c:}i\8R  
 public: G%Dhj)2}  
  virtual BOOL InitInstance(); W.67};',  
  virtual int ExitInstance(); A!xx#+M  
  //}}AFX_VIRTUAL @B e7"Fm  
  //{{AFX_MSG(CHookApp) n*yVfI  
  // NOTE - the ClassWizard will add and remove member functions here. SLGo/I*  
  // DO NOT EDIT what you see in these blocks of generated code ! mEh([ZnY  
  //}}AFX_MSG CGYZEPRR  
  DECLARE_MESSAGE_MAP() jEa U;  
}; /^Ckk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); (j>a?dKDS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XXwe/>J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mT:Z!sS  
BOOL InitHotkey(); "~:AsZ"7  
BOOL UnInit(); o=%pR|  
#endif 3k U4?D]  
VgBZ@*z(x  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4xYW?s(  
#include "stdafx.h" Dej_(Dz_S  
#include "hook.h" !t.*xT4W  
#include <windowsx.h> d<,'9/a>  
#ifdef _DEBUG = ^NTHc^*  
#define new DEBUG_NEW 16pk4f8  
#undef THIS_FILE )c;zNs  
static char THIS_FILE[] = __FILE__; P84uEDY  
#endif >5%;NI5 G  
#define MAX_KEY 100 z&R #j  
#define CTRLBIT 0x04 D=>[~u3H  
#define ALTBIT 0x02 _zuX6DO  
#define SHIFTBIT 0x01 =eHoJq  
#pragma data_seg("shareddata") =PQMd  
HHOOK hHook =NULL; 8(jUCD  
UINT nHookCount =0; \7\7i-Vo  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey {D>@ZC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT EklcnM|6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey V{D~e0i/v  
static int KeyCount =0; d[( }  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift A ,$CYLj+  
#pragma data_seg() 16cc9%   
HINSTANCE hins; Qo%IZw$l  
void VerifyWindow(); /[<1D|f%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) F4R0A6HL  
//{{AFX_MSG_MAP(CHookApp) "kdmqvTHK0  
// NOTE - the ClassWizard will add and remove mapping macros here. O5v)}4  
// DO NOT EDIT what you see in these blocks of generated code! ' 5F3,/r  
//}}AFX_MSG_MAP KFuP gp  
END_MESSAGE_MAP() ^F="'/Pq[  
dm:2:A8^  
CHookApp::CHookApp() dX^d\ wX  
{ awC:{5R8v  
 // TODO: add construction code here, 3<"!h1x5  
 // Place all significant initialization in InitInstance 1+Z@4;fk  
} 9| {t%F=-  
le*'GgU#  
CHookApp theApp; vB<2f*U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8hZY Z /T  
{ 7A=*3  
 BOOL bProcessed=FALSE; Sy0-tK4  
 if(HC_ACTION==nCode) X?B\+dq  
 { ]iq2_{q  
  if((lParam&0xc0000000)==0xc0000000){// Key up ag* 5fBF  
   switch(wParam) Y<WA-dYoF  
   { >;NiG)Z  
    case VK_MENU: XusTU  
     MaskBits&=~ALTBIT; T=W;k<P\k  
     break; s` $YY_  
    case VK_CONTROL: mzGMYi*  
     MaskBits&=~CTRLBIT; 0nu&JQ  
     break; HB0DG<c-  
    case VK_SHIFT: Hl*V i3bQU  
     MaskBits&=~SHIFTBIT; -(Fhj Ir  
     break; n@PXC8}  
    default: //judge the key and send message f [DZ  
     break; *u)#yEJ)  
   } ;i>(r;ZM  
   for(int index=0;index<MAX_KEY;index++){ :|z.F+-/  
    if(hCallWnd[index]==NULL) =cwdl7N&I  
     continue; ~:xR0dqx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 25H=RTw  
    { CU+H`-+"J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 86f8b{_e"  
     bProcessed=TRUE; <t"KNKI  
    } .Y*jL&!  
   } 2E$K='H:,  
  } c`agrS:P  
  else if((lParam&0xc000ffff)==1){ //Key down 9cJ1J7y  
   switch(wParam) F`e o3z  
   { xWuvT,^  
    case VK_MENU: UV#DN`%n  
     MaskBits|=ALTBIT; zPyN2|iFah  
     break; 0qSf7"3f  
    case VK_CONTROL: @p 2XaqZ  
     MaskBits|=CTRLBIT; !;U;5e=0  
     break; Gl]z@ZXWIw  
    case VK_SHIFT: u 2%E(pr  
     MaskBits|=SHIFTBIT; i$jzn ga  
     break; u+Sj#iZ  
    default: //judge the key and send message wN2D{Jj  
     break; mhv ;pM6  
   } >MLP mER  
   for(int index=0;index<MAX_KEY;index++) -A(]U"@n  
   { +]$c+!khj  
    if(hCallWnd[index]==NULL) Xwz'h;Ks_  
     continue; dUc ([&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >^bSjE  
    { ,(v=ZeI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); z>A;|iL  
     bProcessed=TRUE; ,b,t^xX>)  
    } +8Q5[lh2]j  
   } =DsFR9IB  
  } R^Y>v5jAe  
  if(!bProcessed){ yP*oRV%uX  
   for(int index=0;index<MAX_KEY;index++){ X ApSKJ  
    if(hCallWnd[index]==NULL) ]r@CmwC  
     continue; s#4Q?<65u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Rxl/)H[Lc"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !9]q+XefJ  
   } ::k cV'*  
  } -Zfq:Kr  
 } !vGJ 7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z"$huE>P6  
} (RafidiH  
#m6W7_  
BOOL InitHotkey() ,#8H9<O9t  
{ ' )~G2Ys  
 if(hHook!=NULL){ @s8wYcW  
  nHookCount++; &2//\Qz  
  return TRUE; FKU)# Eo  
 } 5.U4P<qS  
 else gI{56Z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +O?`uV  
  if(hHook!=NULL) 7z9[\]tt  
   nHookCount++; 6>F1!Q  
  return (hHook!=NULL); iXD=_^^o .  
} :IRQouTf:,  
BOOL UnInit() G`R_kg9$  
{ mt]50}eK  
 if(nHookCount>1){ sHm :G_  
  nHookCount--; hO..j  
  return TRUE; %R@&8  
 } m?O"LGBB =  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2|D<0d#W  
 if(unhooked==TRUE){ KD73Aw  
  nHookCount=0; \$Aw[ 5&t  
  hHook=NULL; n{E9p3i  
 } K(heeZUt  
 return unhooked; a~A"uLBR  
} !WNO!S0/j  
<~P([5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9ve)+Lk  
{ R~N'5#.*M  
 BOOL bAdded=FALSE; ~NB lJULS  
 for(int index=0;index<MAX_KEY;index++){ ^9`~-w  
  if(hCallWnd[index]==0){ )g[7XB/w  
   hCallWnd[index]=hWnd; 0wZAsG"Bg  
   HotKey[index]=cKey; U~_G *0  
   HotKeyMask[index]=cMask; x4[ Fn3JL  
   bAdded=TRUE; )!g@MHHL  
   KeyCount++; 7-2,|(Xg  
   break; Ep8 y  
  } g7O , <  
 } *(j -jbA  
 return bAdded;  "xp>Vj  
} zD): yEc  
b*dEX%H8sf  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) O^<\]_l  
{ e<-^  
 BOOL bRemoved=FALSE; 0w ;#4X:m  
 for(int index=0;index<MAX_KEY;index++){ Ahrtl6@AS  
  if(hCallWnd[index]==hWnd){ -< }#ImTN  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ M =6  
    hCallWnd[index]=NULL; %nT&  
    HotKey[index]=0; HRW }Yl  
    HotKeyMask[index]=0; Rv@( [rn+  
    bRemoved=TRUE; Fu"@)xw/-q  
    KeyCount--; Ufv0Xj  
    break; %tZ[wwt  
   } 0;:AT|U/d  
  } :my@Oxx4@  
 } @j+X>TD  
 return bRemoved; q\T}jF\t  
} 06fs,!Q@  
kf2e-)uUs  
void VerifyWindow() '^~3 8=FA  
{ -`d(>ok  
 for(int i=0;i<MAX_KEY;i++){ g%2twq_  
  if(hCallWnd!=NULL){ VIg=| Oe),  
   if(!IsWindow(hCallWnd)){ %a$Fsn  
    hCallWnd=NULL; un(fr7NW  
    HotKey=0; )kK" 1\m  
    HotKeyMask=0; ">rt *?^  
    KeyCount--; V SUz+W  
   } OvtiFN^s'  
  } P<s:dH"  
 } ]WZi +  
} k80!!S=_>  
HK!Vd_&9,  
BOOL CHookApp::InitInstance() 2-.%WhE/  
{ V'XvwO@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); BRGTCR  
 hins=AfxGetInstanceHandle(); 3:G94cp5  
 InitHotkey(); 2Ik@L,  
 return CWinApp::InitInstance(); /7-qb^V  
} "Go)t + -  
`8N],X  
int CHookApp::ExitInstance() o;M-M(EZQ6  
{ XqK\'8]\Mw  
 VerifyWindow(); DsH`I %w{  
 UnInit(); ky98Bz%  
 return CWinApp::ExitInstance(); 1[r;  
} ]6 vqgu  
'c|Y*2@  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file I\peO/w  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *) ?Fo  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 20p/p~<  
#if _MSC_VER > 1000 =*?2+ ;  
#pragma once a?QDf5C q  
#endif // _MSC_VER > 1000 60St99@O  
8ncgTCH:  
class CCaptureDlg : public CDialog Nd.Tda!Kg  
{ ]VS$ ?wD  
 // Construction + s snCr  
 public: .+TriPL  
  BOOL bTray; H<6/i@ly  
  BOOL bRegistered; 9p5{,9.3*  
  BOOL RegisterHotkey();  zOnQ656  
  UCHAR cKey; wc5OK0|  
  UCHAR cMask; YOHYXhc{S  
  void DeleteIcon(); 3e.v'ccK&  
  void AddIcon(); -O=a"G=  
  UINT nCount; uKZe"wN;  
  void SaveBmp(); JV#)?/a$z  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <NO?B+ ~]  
  // Dialog Data `+(|$?Cu  
  //{{AFX_DATA(CCaptureDlg) _,M:"3;Z  
  enum { IDD = IDD_CAPTURE_DIALOG }; ToHCS/J59  
  CComboBox m_Key; >r"~t70C~]  
  BOOL m_bControl; Gv,0{DVX<  
  BOOL m_bAlt; buhn~ c  
  BOOL m_bShift; R.EA5X|_  
  CString m_Path; ;=.QT  
  CString m_Number; 3 T3p[q4  
  //}}AFX_DATA *L9s7RR  
  // ClassWizard generated virtual function overrides .qioEqK8!y  
  //{{AFX_VIRTUAL(CCaptureDlg) G'<J8;B* t  
 public: |WB<yA1  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2>l:: 8Pp  
 protected: $3! j1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .wD>0Ig  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,Jf)A/_  
  //}}AFX_VIRTUAL {q1&4U~'>O  
  // Implementation =Po!\[SBU  
 protected: Oifu ?f<r  
  HICON m_hIcon; )-9G*3  
  // Generated message map functions +_?;%PKkuF  
  //{{AFX_MSG(CCaptureDlg) "9 -duDg  
  virtual BOOL OnInitDialog(); =De%]]>   
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7"r7F#D=G  
  afx_msg void OnPaint(); X?b]5?K;r  
  afx_msg HCURSOR OnQueryDragIcon(); MO :##C  
  virtual void OnCancel(); cK>5!2b  
  afx_msg void OnAbout(); KLXv?4!  
  afx_msg void OnBrowse(); _1c'~;  
  afx_msg void OnChange(); q0 :Lb  
 //}}AFX_MSG 'f<0&Ci8  
 DECLARE_MESSAGE_MAP() OxqbHe  
}; ,LXuU8sB  
#endif &G@*/2A  
ke~O+]  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f{lg{gA(  
#include "stdafx.h" QzIK580%t  
#include "Capture.h" sb_>D`>  
#include "CaptureDlg.h" qqSk*oH~  
#include <windowsx.h> iLy }G7h  
#pragma comment(lib,"hook.lib") g!7/iKj:  
#ifdef _DEBUG b^PYA_k-Xn  
#define new DEBUG_NEW !xMyk>%2  
#undef THIS_FILE ]?^m;~MQZ  
static char THIS_FILE[] = __FILE__; m4ovppC  
#endif sRo%=7Z  
#define IDM_SHELL WM_USER+1 '@HWp8+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !O)Ruwy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _p7c<$ ;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #:{PAt  
class CAboutDlg : public CDialog DI9x] CR  
{ m$A|Sx&sG$  
 public: ^MUtmzh  
  CAboutDlg(); 1c,$D5#  
  // Dialog Data g!D?Yj4  
  //{{AFX_DATA(CAboutDlg) ~tDV{ml  
  enum { IDD = IDD_ABOUTBOX }; ?`,UW;Br6  
  //}}AFX_DATA *gu~7&yoP  
  // ClassWizard generated virtual function overrides zF(I#|Vo  
  //{{AFX_VIRTUAL(CAboutDlg) eqs.zL  
 protected: ?bQ~ +M\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zXvAW7  
  //}}AFX_VIRTUAL NXDdU^w7B  
  // Implementation sju. `f>-r  
 protected: N(]6pG=  
  //{{AFX_MSG(CAboutDlg) jRXByi=9  
  //}}AFX_MSG 0NZg[>H  
  DECLARE_MESSAGE_MAP() \8=>l?P  
}; ,#UaWq@7  
hFZ7{pj  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) LnxJFc:1K  
{ p-y,OG  
 //{{AFX_DATA_INIT(CAboutDlg) WWc{]R^D  
 //}}AFX_DATA_INIT _%;$y5]v  
} AlIFTNg:"  
wvcG <sj  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) W<xu*U(A  
{ +I5@Gys  
 CDialog::DoDataExchange(pDX); QW|,_u5j  
 //{{AFX_DATA_MAP(CAboutDlg) 8{@|M l  
 //}}AFX_DATA_MAP 7$a,pNDw  
} @.a[2,o_  
dMQtW3stY  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) N{tNe-5  
 //{{AFX_MSG_MAP(CAboutDlg) 60*2k  
 // No message handlers |(*ReQ?=  
 //}}AFX_MSG_MAP O2us+DhQ  
END_MESSAGE_MAP() 4H]Go~<  
1xar L))  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #Fl "#g$  
: CDialog(CCaptureDlg::IDD, pParent) D1;H,  
{ /d&zE|!  
 //{{AFX_DATA_INIT(CCaptureDlg) fDNiU"  
  m_bControl = FALSE; 81O`#DfZ  
  m_bAlt = FALSE; e]'ui<`  
  m_bShift = FALSE; 7MZBU~,r  
  m_Path = _T("c:\\"); d0"Hu^]  
  m_Number = _T("0 picture captured."); b\Y<1EV^[  
  nCount=0; 93$'PwWgiF  
  bRegistered=FALSE; U ]`SM6  
  bTray=FALSE; )/1AF^ E  
 //}}AFX_DATA_INIT ?]]> WP  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 }Ry:})  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); WolkW:(Cg  
} NGOc:>}k>  
ARGtWW~:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) n#Q;b Sw  
{ CH[U.LJQ-O  
 CDialog::DoDataExchange(pDX); 7IB<0  
 //{{AFX_DATA_MAP(CCaptureDlg) >\ y|}|?  
  DDX_Control(pDX, IDC_KEY, m_Key); pwtB{6)VH{  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  s!X@ l  
  DDX_Check(pDX, IDC_ALT, m_bAlt); RZ-=UIf  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); _dky+ E  
  DDX_Text(pDX, IDC_PATH, m_Path); !K-lO{Z^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1@rI4U@D  
 //}}AFX_DATA_MAP @E %:ALJ  
} 5ltEnvN  
Anr''J&9`H  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) cVYDO*N2T  
//{{AFX_MSG_MAP(CCaptureDlg) }^U7NZn<"  
 ON_WM_SYSCOMMAND() ebK/cPa8  
 ON_WM_PAINT() Q>Voa&tYn  
 ON_WM_QUERYDRAGICON()   V` 7  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) rp^= vfW  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;rXkU9  
 ON_BN_CLICKED(ID_CHANGE, OnChange) }Q&zYC]d  
//}}AFX_MSG_MAP 7DZxr Vw  
END_MESSAGE_MAP() ecaEWIOG  
#JMww  
BOOL CCaptureDlg::OnInitDialog() Hvqvggfi  
{ N3dS%F,_  
 CDialog::OnInitDialog(); sdN@ZP  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )r2$!(NQ  
 ASSERT(IDM_ABOUTBOX < 0xF000); H@Yj  
 CMenu* pSysMenu = GetSystemMenu(FALSE); B=14 hY@`  
 if (pSysMenu != NULL) _ 3@[S F  
 { 0<tce  
  CString strAboutMenu; _=0%3Sh  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .)=T1^[hI  
  if (!strAboutMenu.IsEmpty()) :{sy2g/+  
  { j11FEE<W  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5&A{IN  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "#}Uh  
  } ]JDKoA{S0  
 } 4`E[ WE:Q  
 SetIcon(m_hIcon, TRUE); // Set big icon JTGA\K  
 SetIcon(m_hIcon, FALSE); // Set small icon )/4eT\=  
 m_Key.SetCurSel(0); 03N|@Tu  
 RegisterHotkey(); % !P^se  
 CMenu* pMenu=GetSystemMenu(FALSE); hc7"0mVd{  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @M( hyS&on  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7x> \/l(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); v7-z<'?s~  
 return TRUE; // return TRUE unless you set the focus to a control _*iy *:(o  
} PmjN!/  
+"}#4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #*;G8yV  
{ FYBW3y+AF&  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,c]<Yu  
 { (1%O;D.*?{  
  CAboutDlg dlgAbout; !LI 8Xk  
  dlgAbout.DoModal(); B`<a~V  
 } o|7ztpr  
 else 0*J},#ba$  
 { *ggai?  
  CDialog::OnSysCommand(nID, lParam); C[ma!he  
 } 2^aXXPC  
} >DM^/EAG{  
xaN[ru@  
void CCaptureDlg::OnPaint() aHR+4m~)  
{ 7&`Yl[G  
 if (IsIconic()) _-=yD@;[D  
 { tl6x@%\  
  CPaintDC dc(this); // device context for painting `8 Ann~Z|k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <nvzNXql  
  // Center icon in client rectangle BbIg]E/G  
  int cxIcon = GetSystemMetrics(SM_CXICON); qV{iUtYt  
  int cyIcon = GetSystemMetrics(SM_CYICON); 99GK6}~TGm  
  CRect rect; }'`iJ b\  
  GetClientRect(&rect); Hb&C;lk  
  int x = (rect.Width() - cxIcon + 1) / 2; <D`VFSEJ  
  int y = (rect.Height() - cyIcon + 1) / 2; Zjkg"  
  // Draw the icon \yhj{QS.k  
  dc.DrawIcon(x, y, m_hIcon); d~abWBgC`  
 } %n{ue9  
 else w~AW( VX  
 { w# R0QF  
  CDialog::OnPaint(); (jI_Dk;  
 } xLShMv}  
} ThiM6Hb  
G2 0   
HCURSOR CCaptureDlg::OnQueryDragIcon() aY8QYK ;?^  
{ >F5E^DY  
 return (HCURSOR) m_hIcon; ' e:rL.  
} _T.T[%-&=  
#z#`EBXV$6  
void CCaptureDlg::OnCancel() g/+|gHq^  
{ i%GNm D  
 if(bTray) =3;~7bYO  
  DeleteIcon(); m)ENj6A>yP  
  CDialog::OnCancel(); VQ7A"&hh  
} miUjpXt  
aZ'(ar :  
void CCaptureDlg::OnAbout() HSj=g}r  
{ T@R2H&L  
 CAboutDlg dlg; \Lg{GN.  
 dlg.DoModal(); !B/5@P  
} 9jI5bi)  
=rN_8&  
void CCaptureDlg::OnBrowse() 3S"kw  
{ -\&b&;_  
 CString str; SnVb D<  
 BROWSEINFO bi; F;8Uvj  
 char name[MAX_PATH]; 'M35L30  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); S0WKEv@Hn  
 bi.hwndOwner=GetSafeHwnd(); FO:k >F  
 bi.pszDisplayName=name; -ZH6*7!  
 bi.lpszTitle="Select folder"; B8 r#o=q1  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [5-3PuT&9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z#zXary5s  
 if(idl==NULL) AP9>_0=  
  return; hQ}y(2A.XI  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^WUG\@B  
 str.ReleaseBuffer(); @ r/f  
 m_Path=str; -eFq^KP2  
 if(str.GetAt(str.GetLength()-1)!='\\') 8Z>=sUMQ  
  m_Path+="\\"; \t ^9UN  
 UpdateData(FALSE); 9+!"[  
} .zo>,*:t  
+:&|]$8<  
void CCaptureDlg::SaveBmp() &Fh#otH_  
{ C/ENJ&  
 CDC dc; cd.|>  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); |W*i'E   
 CBitmap bm; <P_B|Y4N/  
 int Width=GetSystemMetrics(SM_CXSCREEN); HFW8x9Cc  
 int Height=GetSystemMetrics(SM_CYSCREEN); zXGi  
 bm.CreateCompatibleBitmap(&dc,Width,Height); O0QK `F/)*  
 CDC tdc; i\C~]K~O!  
 tdc.CreateCompatibleDC(&dc); Qq<+QL|  
 CBitmap*pOld=tdc.SelectObject(&bm); kqZ+e/o>O9  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); lr9s`>9  
 tdc.SelectObject(pOld); Fjw+D1q.  
 BITMAP btm; QygbfW6u  
 bm.GetBitmap(&btm); Jj7he(!_1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; W$`p ,$.n  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); sh;>6xB  
 BITMAPINFOHEADER bih; I2)#."=Ew  
 bih.biBitCount=btm.bmBitsPixel; ?dY|,_O  
 bih.biClrImportant=0; ;` ! j~  
 bih.biClrUsed=0; ^gY3))2_  
 bih.biCompression=0; Bn5$TiTcl  
 bih.biHeight=btm.bmHeight; t{Z:N']H  
 bih.biPlanes=1; V?N8 ,)j  
 bih.biSize=sizeof(BITMAPINFOHEADER); }\]J?I+A  
 bih.biSizeImage=size; V]P%@<C  
 bih.biWidth=btm.bmWidth; :NXM.@jJ="  
 bih.biXPelsPerMeter=0; ~ ":}Rs  
 bih.biYPelsPerMeter=0; 8}{W.np_  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -P-&]F5  
 static int filecount=0; |WsB0R  
 CString name; jn+BH3e  
 name.Format("pict%04d.bmp",filecount++); O_^t u?x  
 name=m_Path+name; :7)lgiM2  
 BITMAPFILEHEADER bfh; qORRpWyx&  
 bfh.bfReserved1=bfh.bfReserved2=0; r;8X6C  
 bfh.bfType=((WORD)('M'<< 8)|'B'); e<r}{=1w  
 bfh.bfSize=54+size; ?(>fB2^  
 bfh.bfOffBits=54; >M^4p   
 CFile bf; @<C<rB8R  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ E[2xo/H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); hv#|dI=kZR  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -p[!C I  
  bf.WriteHuge(lpData,size); ^e(*{K;8  
  bf.Close(); !b8.XGo  
  nCount++; ,O`~ D~$  
 } rvp#[RAaS}  
 GlobalFreePtr(lpData); CC,CKb  
 if(nCount==1) mH /9J  
  m_Number.Format("%d picture captured.",nCount); R>R8LIZZc  
 else )=%TIkeF  
  m_Number.Format("%d pictures captured.",nCount); -;j ' =?  
  UpdateData(FALSE); i2X%xYv ^  
} G1G*TSf  
Xsd+5="{N  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 1)hO!%  
{ E@_]L<Z  
 if(pMsg -> message == WM_KEYDOWN) 4#lOAzDtv  
 { +{au$v}  
  if(pMsg -> wParam == VK_ESCAPE) .dKFQH iYJ  
   return TRUE; =pd#U  
  if(pMsg -> wParam == VK_RETURN) _ls i,kg?  
   return TRUE; \`Ow)t:  
 } v`Yj)  
 return CDialog::PreTranslateMessage(pMsg); _:~I(c6   
} "I0F"nQ  
{8T/;K@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) T&+y~c[au  
{ maOt/-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W[t0hbV w  
  SaveBmp(); 'J_`CS  
  return FALSE;  ,$(a,`s)  
} <5o oML]nP  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 'f-8P  
 CMenu pop; >G}g=zy@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); QE+HL8c^s  
 CMenu*pMenu=pop.GetSubMenu(0); %gEgp Jd  
 pMenu->SetDefaultItem(ID_EXITICON); ";;Nc>-Y  
 CPoint pt; v@Qfx V2  
 GetCursorPos(&pt); HcCT=x7:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); x Tf|u  
 if(id==ID_EXITICON) 1<;G oC"  
  DeleteIcon(); +d=w%r)  
 else if(id==ID_EXIT) [Zne19/  
  OnCancel(); =XFyEt  
 return FALSE; z -uW,  
} %<{1 N|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +*Zjo&pc  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4WP@ F0@n3  
 AddIcon(); s@(ME1j(U!  
 return res; \S0QZQbz/  
} {<Y\flj{@m  
)4^Sz&\  
void CCaptureDlg::AddIcon() S`pBEM  
{ C_;A~iI7  
 NOTIFYICONDATA data; dfT  
 data.cbSize=sizeof(NOTIFYICONDATA); /a }` y  
 CString tip; K)W:@,*  
 tip.LoadString(IDS_ICONTIP); ZKt`>KZ  
 data.hIcon=GetIcon(0); !OV+=Rwdx  
 data.hWnd=GetSafeHwnd(); pvhN.z  
 strcpy(data.szTip,tip); @1s 2# )l(  
 data.uCallbackMessage=IDM_SHELL; n;e.N:p  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; %+@<T<>J<k  
 data.uID=98; EIF"{,m  
 Shell_NotifyIcon(NIM_ADD,&data); 6cX Z3;a  
 ShowWindow(SW_HIDE); s9,Z}]Th  
 bTray=TRUE; ',]^Qu`a  
} p4vX3?&1W  
<Yn-sH  
void CCaptureDlg::DeleteIcon() GDYFhH7H  
{ 5xhYOwQBo  
 NOTIFYICONDATA data; R5=M{  
 data.cbSize=sizeof(NOTIFYICONDATA); 6"yIk4u:  
 data.hWnd=GetSafeHwnd(); Y2$xlqQd"  
 data.uID=98; `\yQn7 Oq  
 Shell_NotifyIcon(NIM_DELETE,&data); Qv]>L4PO  
 ShowWindow(SW_SHOW); 1F R  
 SetForegroundWindow(); *_@$ "9  
 ShowWindow(SW_SHOWNORMAL); DFp">1@`PR  
 bTray=FALSE; `JcWH_[  
} xM?tdQ~VHY  
6 -BC/  
void CCaptureDlg::OnChange() ^#]eCXv  
{ MH/bJtNq  
 RegisterHotkey(); ~uu{ v')  
} ^ /)%s3  
L:7 kp<E  
BOOL CCaptureDlg::RegisterHotkey() TGGbO:s3  
{ 4o<' fY  
 UpdateData(); 2%vG7o,#  
 UCHAR mask=0; APyH.]mQ  
 UCHAR key=0; EN5F*s@r  
 if(m_bControl) g\pLQH  
  mask|=4; }pKKNZ`[  
 if(m_bAlt) R%6KxN)+@  
  mask|=2; GHpP *x  
 if(m_bShift) 6|QIzs<Z-X  
  mask|=1; )i<Qg.@MX  
  key=Key_Table[m_Key.GetCurSel()]; >[S\NAE>  
 if(bRegistered){ $:D\yZ,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); >,x``-  
  bRegistered=FALSE; lJt?0;gn  
 } WmuYHEU  
 cMask=mask; 4VhKV JX  
 cKey=key; kOQ!]-;  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); nw0Tg= P  
 return bRegistered; V W(+sSQ  
} U% OlYP$g  
Q-KBQc  
  四、小结 fvRqt)Ks  
]v l?J  
  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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