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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: &uwj&-u?  
  OI3UC=G  
  一、实现方法 0f.rjd  
d\Xi1&&  
  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: rlEp&"+|M  
" gB.  
#pragma data_seg("shareddata") 'j84-U{&)  
HHOOK hHook =NULL; //钩子句柄 ,wJ#0?  
UINT nHookCount =0; //挂接的程序数目 U$[C>~r  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 v:*t5M >  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 $vNz^!zgV  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ^qL2Q*  
static int KeyCount =0; }]1=?:tX%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ! 6kLL  
#pragma data_seg()  y{h y  
B3V:?#  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 <qD/ #$   
J:  
  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: 0GR\iw$[J  
o9dqHm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Z^i=51  
cKey,UCHAR cMask) !r:X`~\a  
{ t.sbfLu  
 BOOL bAdded=FALSE; o9)pOwk7;  
 for(int index=0;index<MAX_KEY;index++){ Y>KRI2](<  
  if(hCallWnd[index]==0){ -!uut7Z|  
   hCallWnd[index]=hWnd; YNc] x>  
   HotKey[index]=cKey; > }#h  
   HotKeyMask[index]=cMask; yc.Vm[!  
   bAdded=TRUE; UGuEZ-r  
   KeyCount++; V[f-Nj Kf  
   break; +u%^YBr  
  } UUy%:t  
 } <3dmY=  
 return bAdded; i6R2R8  
} 2 s,[DC  
//删除热键 a []Iz8*6e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v)|[=  
{ z?$F2+f&  
 BOOL bRemoved=FALSE; K~"J<798{  
 for(int index=0;index<MAX_KEY;index++){ ncg5%(2  
  if(hCallWnd[index]==hWnd){ (Dr g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ e)dPv:oK3  
    hCallWnd[index]=NULL; l4+!H\2  
    HotKey[index]=0; NET?Ep  
    HotKeyMask[index]=0; Mq-QWx"P  
    bRemoved=TRUE; 8d9&LPv  
    KeyCount--; )ndcBwQc"  
    break; ,}15Cse  
   } L8K= Q  
  } 5y7rY!]Bf  
 } 4`F(RweGx  
 return bRemoved; >$=-0?.  
} ?Xm!;sS0  
8H4"mxO  
1iq,Gd-G.  
  DLL中的钩子函数如下: <7HVkAa  
;Ee!vqD2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) u.( WW(/N  
{ Jy)E!{#x  
 BOOL bProcessed=FALSE; wD|,G!8E2  
 if(HC_ACTION==nCode) %"GF+  
 { t0_o .S  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 C3kxw1*   
   switch(wParam) m,nZrap  
   {  a.+2h%b  
    case VK_MENU: c|<*w[%C  
     MaskBits&=~ALTBIT; :fI|>I ~  
     break; Js7(TFQE  
    case VK_CONTROL: " , c1z\  
     MaskBits&=~CTRLBIT; ji(W+tQ2Y'  
     break; #:0dq D=  
    case VK_SHIFT: 1{N73]-M:  
     MaskBits&=~SHIFTBIT; `YTagUq7  
     break; < aeBhg%  
    default: //judge the key and send message g z!q  
     break; y+f@8]  
   } )(~s-x^\z@  
   for(int index=0;index<MAX_KEY;index++){ o JC-?  
    if(hCallWnd[index]==NULL) `n%uvo}UT  
     continue; s(56aE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tydD~a  
    { ]H8CVue  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); UpL1C~&  
     bProcessed=TRUE; Qs2 E>C  
    } yidUtSv=,  
   } 9"Vch;U$  
  } O9OD[VZk  
  else if((lParam&0xc000ffff)==1){ //有键按下 1qWIku  
   switch(wParam) K*;e>{p  
   { !mNXPqnN  
    case VK_MENU: O]{3aMs!Y  
     MaskBits|=ALTBIT; VU+`yQp  
     break; $0WO 4C%M  
    case VK_CONTROL: 68ce+|  
     MaskBits|=CTRLBIT; TWF6YAQ m  
     break; RAMkTS  
    case VK_SHIFT: ^lVZW8  
     MaskBits|=SHIFTBIT; @y%4BU&>0  
     break; n4Fh*d ixg  
    default: //judge the key and send message 8A/;a{   
     break; aty"6~  
   } 4Q2=\-KFj  
   for(int index=0;index<MAX_KEY;index++){ ?sQOz[ig;  
    if(hCallWnd[index]==NULL) ;,T3C:S?  
     continue; %H=d_Nm{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JmDi{B?  
    { j^ L"l;m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Cz=HxU80J  
     bProcessed=TRUE; E$5)]<p! <  
    } dQ6:c7hp>D  
   } >ZMB}pt`  
  } 4;anoqiG\  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 XWH{+c"  
   for(int index=0;index<MAX_KEY;index++){ Il(p!l<Xz#  
    if(hCallWnd[index]==NULL) om%L>zfB  
     continue; _`yd"0 Ux  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _ndc^OG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,ra!O=d~0  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 yOKpi&! r  
   } ? b;_T,S[  
  } (_S`9Z8=  
 } <CrNDY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ACQc 0:q  
} 8S2sNpLi-g  
*`~ woF  
  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: dQUZ11  
^z&eD,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /Q h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C9^[A4O@X!  
3WdYDv]N}L  
  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: \)Sa!XLfT  
+<5q8{]Pk  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,&>LBdG`  
{ %LBa;M  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) VO#x+u]/  
 { D$C>ZF  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 s Xyc _3N  
  SaveBmp(); P%?|V _m  
  return FALSE; [ kI|Thx  
 } 4.7 YIM  
 …… //其它处理及默认处理 npsDy&  
} G-`4TQ  
X}T/6zk  
(Fc\*Vn  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 2$=U#!OtU  
*v1M^grKd  
  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。 2aQR#lcv  
yW::`  
  二、编程步骤 j8k5B"  
L?~>eT  
  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"; 12 y=Eh  
8K: RoR  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; bI~ R6o  
!|!k9~v!  
  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; ^PwZP;On  
a=(D`lQ8  
  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; @qP uYFnw  
}yQ&[Mt  
  5、 添加代码,编译运行程序。 P2y`d9,Q  
Yj%hgb:)  
三、程序代码 DK' ? '  
?:@13wm  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL |wF_CZ*1  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #2*l"3.$.R  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ P2HR4`c  
#if _MSC_VER > 1000 ;U7o)A;  
#pragma once 9a\H+Y~  
#endif // _MSC_VER > 1000 VaYL#\;c<  
#ifndef __AFXWIN_H__ Swugt"`nN  
#error include 'stdafx.h' before including this file for PCH f uzz3#  
#endif m]C|8b7Y  
#include "resource.h" // main symbols OIi8x? .~]  
class CHookApp : public CWinApp bv %Bo4s  
{ m |K"I3W$  
 public: -Ky<P<@ezm  
  CHookApp(); E P1f6ps  
  // Overrides 71euRIW'5  
  // ClassWizard generated virtual function overrides Be~__pd  
  //{{AFX_VIRTUAL(CHookApp) CC{*'p6  
 public: yT[CC>]l  
  virtual BOOL InitInstance(); JmMB=} <  
  virtual int ExitInstance(); Xe;Eu  
  //}}AFX_VIRTUAL ;<=Z\NX  
  //{{AFX_MSG(CHookApp) QaAA@l  
  // NOTE - the ClassWizard will add and remove member functions here. 0r<?Ve  
  // DO NOT EDIT what you see in these blocks of generated code ! w'Y(doY ,  
  //}}AFX_MSG OS$}ej\  
  DECLARE_MESSAGE_MAP() ^HS;\8Xvb  
}; PE!/n6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); b2L9%8h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h%4aL38  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }~W:3A{7;  
BOOL InitHotkey(); w&c6iFMd0  
BOOL UnInit(); xIt'o(jQH  
#endif Y-Iu&H+\  
}kJfTsFS  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. n ~c<[  
#include "stdafx.h" E[Xqyp!<  
#include "hook.h" 0.pZlv  
#include <windowsx.h> SB1j$6]OR7  
#ifdef _DEBUG ;_$Q~X  
#define new DEBUG_NEW m1pge4*  
#undef THIS_FILE %}.4c8  
static char THIS_FILE[] = __FILE__; Iax-~{B3AY  
#endif `'W/uCpl  
#define MAX_KEY 100 [z:.52@!  
#define CTRLBIT 0x04 HgGwV;W  
#define ALTBIT 0x02 }I}/e v  
#define SHIFTBIT 0x01 a$=BX=  
#pragma data_seg("shareddata") QR+xPY~  
HHOOK hHook =NULL; ,=_)tX^  
UINT nHookCount =0; e>$d*~mwn  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey vR"?XqgZ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT $7bLw)7  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey W D/\f$4  
static int KeyCount =0; GG0H3MSc  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 'iY~F0U  
#pragma data_seg() _sp, ,gz  
HINSTANCE hins; ;s*   
void VerifyWindow(); ]|JQH  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) IOfxx>=3  
//{{AFX_MSG_MAP(CHookApp) h.Y&_=Gc  
// NOTE - the ClassWizard will add and remove mapping macros here. ddTsR  
// DO NOT EDIT what you see in these blocks of generated code! lF*}l  
//}}AFX_MSG_MAP ^`~s#L7  
END_MESSAGE_MAP() $&25hvK,  
UWW^g@d4  
CHookApp::CHookApp() uBp,_V?  
{ y ;/T.W9!  
 // TODO: add construction code here, .2Q4EbM2  
 // Place all significant initialization in InitInstance kC,=E9)O  
} 8=K%7:b  
f 7R/i  
CHookApp theApp; r|MBkpcvp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %fT%,( w}t  
{ -R]Iu\  
 BOOL bProcessed=FALSE; T\ *#9a  
 if(HC_ACTION==nCode) A ".v+  
 { T }}T`Ce  
  if((lParam&0xc0000000)==0xc0000000){// Key up kk`K)PESi  
   switch(wParam) bIXudE[8zq  
   { <<=.;`(/v  
    case VK_MENU: | 2Vhj<6  
     MaskBits&=~ALTBIT; ]KQv ]'  
     break; 9T\uOaC"  
    case VK_CONTROL: n1!}d%:  
     MaskBits&=~CTRLBIT; VGY x(  
     break; 12i<b  
    case VK_SHIFT: %nS(>X<B  
     MaskBits&=~SHIFTBIT; H]P*!q`Ko  
     break; elqm/u  
    default: //judge the key and send message E"O6N.}.  
     break; AZ9;6Df  
   } z|F38(%JJN  
   for(int index=0;index<MAX_KEY;index++){ > `1K0?_  
    if(hCallWnd[index]==NULL) &%UZ"CcA  
     continue; ~xa yGk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1^ijKn@6  
    { =.`:jZG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); |Q(3rcOrV"  
     bProcessed=TRUE; &ir|2"HV  
    } +`J~c|(  
   } P5JE = &M  
  } bJ"}-s+Dx  
  else if((lParam&0xc000ffff)==1){ //Key down I!?)}d  
   switch(wParam) q90 ~)n?  
   { G$^u2wz.  
    case VK_MENU: *g*~+B :  
     MaskBits|=ALTBIT; 6`h}#@ (  
     break; FUP0X2P   
    case VK_CONTROL: *@VS^JB  
     MaskBits|=CTRLBIT; S.zY0  
     break; @tX8M[.eA  
    case VK_SHIFT: U!GfDt  
     MaskBits|=SHIFTBIT; 3v91yMx  
     break; mz2v2ma  
    default: //judge the key and send message >vR7l&"  
     break; tCR#TW+IY-  
   } MpVZL29)  
   for(int index=0;index<MAX_KEY;index++) [t6Y,yo&h4  
   { _,<@II  
    if(hCallWnd[index]==NULL) cq`!17"k  
     continue; uv&4 A,h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h ^.jK2I  
    { j5gL 67B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `Hx JE"/  
     bProcessed=TRUE; zNO,vR[\  
    } x MFo  
   } aI\:7  
  } {UFs1  
  if(!bProcessed){ dw-o71(1d  
   for(int index=0;index<MAX_KEY;index++){  nb\pBl  
    if(hCallWnd[index]==NULL) ?$Dc>  
     continue; jK]An;l{Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) p[K!.vOt+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KY%LqcC  
   } z41v5rB4  
  } (Fj"<  
 } P8X59^cJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 35H.ZXQp-  
} 6zp]SPY  
IvX+yU  
BOOL InitHotkey() ~_F<"40  
{ 1{<r~  
 if(hHook!=NULL){ +w2 `  
  nHookCount++; l*z+<c6$_  
  return TRUE; \>tx:;D3  
 } C)mR~Ey  
 else KTE X]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); V6bjVd9|Z  
  if(hHook!=NULL) #= T^XHjQ  
   nHookCount++; #0f6X,3  
  return (hHook!=NULL); 2xBYJoF(  
} U;=1v:~d  
BOOL UnInit() ^&lkh@Y1q  
{ p4@0[z'  
 if(nHookCount>1){ cl'wQ1<:   
  nHookCount--; 'si{6t|  
  return TRUE; ,B:r^(}0j  
 } hvc3n> Y[}  
 BOOL unhooked = UnhookWindowsHookEx(hHook); xC9?Wt'  
 if(unhooked==TRUE){ eGLB,29g  
  nHookCount=0; fCbd]X  
  hHook=NULL; 6@x^,SA  
 } @e-2]z  
 return unhooked; :rU,7`sE/  
} 6@VgLa,  
z~th{4#E ;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) e!ql8wbp  
{ A[`2Mnj  
 BOOL bAdded=FALSE; !-m 'diE  
 for(int index=0;index<MAX_KEY;index++){  (F&o!W  
  if(hCallWnd[index]==0){ *mz-g7  
   hCallWnd[index]=hWnd; !E6Q ED"  
   HotKey[index]=cKey; N<O<wtXIj  
   HotKeyMask[index]=cMask; iB}*<~`.Eg  
   bAdded=TRUE; RBLOc$2  
   KeyCount++; [ut[W9  
   break; txiX1o!/L  
  } 3 TRG] 5  
 } 9 /=+2SZ  
 return bAdded; i}O.,iH  
} _`. Q7  
!tSh9L;<O  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4>Y*owa4  
{ A: O"N  
 BOOL bRemoved=FALSE; zJ_y"bt  
 for(int index=0;index<MAX_KEY;index++){ SPp|/ [i7  
  if(hCallWnd[index]==hWnd){ j XYr&F  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2AW*PDncxP  
    hCallWnd[index]=NULL; <rFh93  
    HotKey[index]=0; =z4J[8bb  
    HotKeyMask[index]=0; (v&iXD5t  
    bRemoved=TRUE; (3Z;c_N  
    KeyCount--; !xU[BCbfYV  
    break; lV9   
   } !8YA1 o  
  } >=86*U~  
 } _K B%g_{  
 return bRemoved; VNs3.  
} AzVv- !Y  
uQ%3?bx)T  
void VerifyWindow() X6j:TF  
{ /i{V21(%  
 for(int i=0;i<MAX_KEY;i++){ ^mouWw)a_  
  if(hCallWnd!=NULL){ TPYh<p#  
   if(!IsWindow(hCallWnd)){ }lP`3e  
    hCallWnd=NULL; _Nh`-R%B)  
    HotKey=0; iqFC~].)  
    HotKeyMask=0; KV! (   
    KeyCount--; Q\}Ck+d` a  
   } W^pf 1I8[  
  } n7|,b- <  
 } VI-6t"l  
} dl(!{tZ#  
qC B{dp/  
BOOL CHookApp::InitInstance() XRTiC #6  
{ C#B|^A_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4HpKKhv"  
 hins=AfxGetInstanceHandle(); K'y|_XsBB)  
 InitHotkey(); @aP1[(m  
 return CWinApp::InitInstance(); :%h|i&B  
} X6BOB?  
j_h0 hm]  
int CHookApp::ExitInstance() MpTOC&NG%s  
{ s{*bFA Z1F  
 VerifyWindow(); Z)f?X  
 UnInit(); {&a6<y#-  
 return CWinApp::ExitInstance(); DPkH:X  
} xUTTRJ(\  
'.jYu7   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file dK4w$~j{k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) lq mr`\@)  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ir=G\/A  
#if _MSC_VER > 1000 +.gj/uy*  
#pragma once DG}s`'  
#endif // _MSC_VER > 1000 VB`% u=  
w&e3#p  
class CCaptureDlg : public CDialog wB:<ICm  
{ nX\mCO4T  
 // Construction l&5Tft  
 public: FF;Fo}no-  
  BOOL bTray; '<>?gE0Cd  
  BOOL bRegistered; ;/H/Gn+  
  BOOL RegisterHotkey(); rs,'vV-2\  
  UCHAR cKey; hZw8*H^tP  
  UCHAR cMask; 7* [  
  void DeleteIcon(); N( f0,  
  void AddIcon(); QP<.~^ao  
  UINT nCount; zN=s]b=/  
  void SaveBmp(); yMC6 Gvp  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor de;CEm<n  
  // Dialog Data Vt,P.CfdC  
  //{{AFX_DATA(CCaptureDlg) zZP/C   
  enum { IDD = IDD_CAPTURE_DIALOG }; 5#y_EpL"  
  CComboBox m_Key; Zy.3yQM9i  
  BOOL m_bControl; D]5j?X'  
  BOOL m_bAlt; aj/+#G2  
  BOOL m_bShift; d%RH]j4  
  CString m_Path; 9aX!<Z  
  CString m_Number; >nvnU`\  
  //}}AFX_DATA +"1-W> HV  
  // ClassWizard generated virtual function overrides (g&@E(@]?  
  //{{AFX_VIRTUAL(CCaptureDlg) T^{=cx9x9  
 public: ]u:_r)T  
  virtual BOOL PreTranslateMessage(MSG* pMsg); C=IN "  
 protected: s< Fp17  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,L C(Ax'.F  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -<sW`HpD'  
  //}}AFX_VIRTUAL yYP>3]z  
  // Implementation % [~0<uO  
 protected: dn:\V?9  
  HICON m_hIcon; K=r~+4F  
  // Generated message map functions 9m\Yi  
  //{{AFX_MSG(CCaptureDlg) uKj(=Rqq  
  virtual BOOL OnInitDialog();  d^zuo  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wEN[o18{  
  afx_msg void OnPaint(); #N%j9  
  afx_msg HCURSOR OnQueryDragIcon(); EB@rIvUi,  
  virtual void OnCancel(); KT7R0v  
  afx_msg void OnAbout(); ddbQFAQQQ  
  afx_msg void OnBrowse(); T%;NW|mH&  
  afx_msg void OnChange(); z.+%{_pe  
 //}}AFX_MSG 1f'msy/  
 DECLARE_MESSAGE_MAP() 6!N2B[9  
}; A8o)^T(vJ  
#endif gGN 6Yqj0  
LDYa{w-t  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \cf'Hj}  
#include "stdafx.h"  z:   
#include "Capture.h" OmK4 \_.  
#include "CaptureDlg.h" D6"d\F m<  
#include <windowsx.h> e{3%-  
#pragma comment(lib,"hook.lib") vF&0I2T~l  
#ifdef _DEBUG B79~-,Yh  
#define new DEBUG_NEW KXpbee  
#undef THIS_FILE YLS*uXB&.  
static char THIS_FILE[] = __FILE__; $My~sN8  
#endif t*dq*(3"c  
#define IDM_SHELL WM_USER+1 PS=q):R|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rQJ\Y3.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); f0R+Mz8{  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; r'lANl-v  
class CAboutDlg : public CDialog 0{u%J%;  
{ 9}L2$^#,NA  
 public: 3}fhU{-c  
  CAboutDlg(); /5Vv5d/Z4!  
  // Dialog Data Z@%A(nZ_  
  //{{AFX_DATA(CAboutDlg) 1=C<aRZ b^  
  enum { IDD = IDD_ABOUTBOX }; b`% !\I  
  //}}AFX_DATA O1wo KkfV  
  // ClassWizard generated virtual function overrides k+J63+obd  
  //{{AFX_VIRTUAL(CAboutDlg) Z9*@w`x^u  
 protected: ]EUQMyR  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z[B:6\oQ  
  //}}AFX_VIRTUAL E|jU8qz>P  
  // Implementation l2YA/9.  
 protected: g_A#WQyh\'  
  //{{AFX_MSG(CAboutDlg) 7%[ YX  
  //}}AFX_MSG e,Y<$kPV  
  DECLARE_MESSAGE_MAP() h%NM%;"H/  
}; jw 5 U-zi  
HL dHyK/S  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nJ/}b/A{  
{ rl&.|;5uH;  
 //{{AFX_DATA_INIT(CAboutDlg) )heHERbJ  
 //}}AFX_DATA_INIT ,}"jiGgS4  
} @ &Od1X  
2@@evQ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) P2| +7D:  
{ &FJr?hY%  
 CDialog::DoDataExchange(pDX); \=`jo$S  
 //{{AFX_DATA_MAP(CAboutDlg) #K/JU{"  
 //}}AFX_DATA_MAP y~wr4Q=  
} JG7K-W|!c  
|[>yJXxEL@  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) da_0{;wR  
 //{{AFX_MSG_MAP(CAboutDlg) 7+IRI|d  
 // No message handlers #!%zf{(C+  
 //}}AFX_MSG_MAP Oamz>Hplu  
END_MESSAGE_MAP() <G`1(,g  
}' s W[?ik  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 6j+X@|2^  
: CDialog(CCaptureDlg::IDD, pParent) ;*ULrX4[  
{ {"2CI^!/U.  
 //{{AFX_DATA_INIT(CCaptureDlg) )[r=(6?n  
  m_bControl = FALSE; ~jmI`X/  
  m_bAlt = FALSE; ao[yHcAs  
  m_bShift = FALSE; g}uSIv^  
  m_Path = _T("c:\\"); >"|t*k S  
  m_Number = _T("0 picture captured."); k g Rys  
  nCount=0; i[ws%GfEv  
  bRegistered=FALSE; j)Kd'Va  
  bTray=FALSE; [1ClZ~f  
 //}}AFX_DATA_INIT %tZrP$DQ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 X#K;(.},h  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 45$aq~%as  
} q)KOI` A  
{MTtj4$  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) &-X51O C  
{ 8V9OMOt!  
 CDialog::DoDataExchange(pDX); =dQ/^C_hj  
 //{{AFX_DATA_MAP(CCaptureDlg) 8.7q -<Q  
  DDX_Control(pDX, IDC_KEY, m_Key); !^v~hD$_q  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); z|Yt|W  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Df:/r%  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); i1A<0W|  
  DDX_Text(pDX, IDC_PATH, m_Path); vy2"B ch  
  DDX_Text(pDX, IDC_NUMBER, m_Number); fakad#O  
 //}}AFX_DATA_MAP t5u#[*  
} OdL/%Zp}  
VeZd\Oe  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *!{&n*N  
//{{AFX_MSG_MAP(CCaptureDlg) T:9M|mD  
 ON_WM_SYSCOMMAND() bZK^q B  
 ON_WM_PAINT() Kp1 F"!  
 ON_WM_QUERYDRAGICON() q^n LC6q  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ;Ru[^p.{  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q&_#R(3j;  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >l/pwb@  
//}}AFX_MSG_MAP %y*'bS  
END_MESSAGE_MAP() t)g %9 k^  
`PvS+>q  
BOOL CCaptureDlg::OnInitDialog() XW@C_@*J  
{ `D$^SHfyz  
 CDialog::OnInitDialog(); o_[~{@RoR  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2;3&&yK2b  
 ASSERT(IDM_ABOUTBOX < 0xF000); W- nS{v(  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $#3[Z;\  
 if (pSysMenu != NULL) `Mcg&Mi~  
 { qPWf=s7!  
  CString strAboutMenu; :}/\hz ,  
  strAboutMenu.LoadString(IDS_ABOUTBOX); rc~)%M<[2  
  if (!strAboutMenu.IsEmpty()) ;OD-?bC  
  { H\N} 0^ea  
   pSysMenu->AppendMenu(MF_SEPARATOR); x K\i&A  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); : yq2 XE%r  
  } wL^x9O|`p9  
 } /C5py&#-I  
 SetIcon(m_hIcon, TRUE); // Set big icon bn5O2  
 SetIcon(m_hIcon, FALSE); // Set small icon qt/6o|V  
 m_Key.SetCurSel(0); PMW@xk^<Y  
 RegisterHotkey(); >K1e=SY  
 CMenu* pMenu=GetSystemMenu(FALSE); bFlI:R&<  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e7\gd\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); p=Le oc1  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4xg1[Z%:  
 return TRUE; // return TRUE unless you set the focus to a control NWQ7%~#k*  
} p>:.js5.a  
/BvMNKb$$  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) a2i:fz=[  
{ burSb:JF  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) kM=&Tfpj  
 { R!WDQGR(2  
  CAboutDlg dlgAbout; AN[pjC<  
  dlgAbout.DoModal(); pS7y3(_  
 } 61OlnmvE  
 else Gl45HyY_  
 { }1+2&Ps50  
  CDialog::OnSysCommand(nID, lParam); 5J&Gc;  
 } _5O~ ]}  
} % W|Sl  
:?m"kh ~  
void CCaptureDlg::OnPaint() C=U4z|Ym  
{ 9f5~hBlo  
 if (IsIconic()) 1&7?f  
 { DB_oRr[oj  
  CPaintDC dc(this); // device context for painting (b&Z\?"  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); W[]|Uu/%  
  // Center icon in client rectangle [fb9;,x`  
  int cxIcon = GetSystemMetrics(SM_CXICON); O#C0~U]dDW  
  int cyIcon = GetSystemMetrics(SM_CYICON); m39.j:BG5  
  CRect rect; 2Dvq3VbiO"  
  GetClientRect(&rect); 9.( [,J  
  int x = (rect.Width() - cxIcon + 1) / 2; zcH"Kh&  
  int y = (rect.Height() - cyIcon + 1) / 2; R%)F9P$o  
  // Draw the icon ^8 -,S[az  
  dc.DrawIcon(x, y, m_hIcon); f;l}Z|dok6  
 } {)!ua7GF0H  
 else 9L4;#cy  
 { {.o4U0+  
  CDialog::OnPaint(); A=e1uBGA  
 } ^gpd '*b  
} xS+xUi  
eoQt87VCU  
HCURSOR CCaptureDlg::OnQueryDragIcon() ^nOh 8L;  
{ H_Sv,lwz;c  
 return (HCURSOR) m_hIcon; D+jvF  
} :P+7ti@  
f4NN?"W)  
void CCaptureDlg::OnCancel() vS3Y9|-:  
{ V$Oj@vI  
 if(bTray) R"CF xo  
  DeleteIcon(); `zl,|}u)  
  CDialog::OnCancel(); g}a+%Obb  
} OPqhdqo  
]iFW>N*a  
void CCaptureDlg::OnAbout() XbFo#Pwk  
{ @ptrF pSL  
 CAboutDlg dlg; m] p]J_6A  
 dlg.DoModal(); ~HT:BO$  
} %(POC=b#[  
TM_bu  
void CCaptureDlg::OnBrowse() '@\[U0?@K  
{ US9@/V*2  
 CString str;  w+5OI9  
 BROWSEINFO bi; }XpZgd$  
 char name[MAX_PATH]; ,+gtr.  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); K]7[|qf&   
 bi.hwndOwner=GetSafeHwnd(); r~fnK%|  
 bi.pszDisplayName=name; <8Zs; >YuK  
 bi.lpszTitle="Select folder"; * 0JF|'  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; w( @QRd{  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Fy$ C._C$  
 if(idl==NULL) T<y fpUzX  
  return; ~G6xk/+n-m  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <pS#wTsN4%  
 str.ReleaseBuffer(); wnLpf  
 m_Path=str; }v_|N"@  
 if(str.GetAt(str.GetLength()-1)!='\\') 8(S|=cR  
  m_Path+="\\"; 0%IZ -])  
 UpdateData(FALSE); bun_R-  
} pjSM7PhQ  
?G]yU  
void CCaptureDlg::SaveBmp() #,})N*7  
{ gQY`qz  
 CDC dc; 55y{9.n*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); _25PyG  
 CBitmap bm; aE"dpYQ  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1}ifJ~)5S  
 int Height=GetSystemMetrics(SM_CYSCREEN); tO"AeZe%|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); >Apa^Bp  
 CDC tdc; dI=&gz  
 tdc.CreateCompatibleDC(&dc); &fkH\o7)  
 CBitmap*pOld=tdc.SelectObject(&bm); B/3xV:Gy  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ]lE5^<<  
 tdc.SelectObject(pOld); aSHN*tP%y  
 BITMAP btm; UalwK  
 bm.GetBitmap(&btm); PtL8Kd0`C  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .uN(44^+x  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); uLI;_,/:  
 BITMAPINFOHEADER bih; JZ-64OT  
 bih.biBitCount=btm.bmBitsPixel; G[OJ <px  
 bih.biClrImportant=0; qk0cf~ gz  
 bih.biClrUsed=0; c@4$)68  
 bih.biCompression=0; 2t{Tz}g*  
 bih.biHeight=btm.bmHeight; XZ8]se"C  
 bih.biPlanes=1; 6KN6SN$  
 bih.biSize=sizeof(BITMAPINFOHEADER); zd F;!  
 bih.biSizeImage=size; &Fk|"f+  
 bih.biWidth=btm.bmWidth; X .K*</(g  
 bih.biXPelsPerMeter=0; :inVwc  
 bih.biYPelsPerMeter=0; |^F$Ta  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); j*1MnP3/8Y  
 static int filecount=0; ^ ~Tn[w W_  
 CString name; ;vpq0t`  
 name.Format("pict%04d.bmp",filecount++); n4H'FZ  
 name=m_Path+name; =~)rT8+)  
 BITMAPFILEHEADER bfh; -G=.3 bux  
 bfh.bfReserved1=bfh.bfReserved2=0; Y2g%{keo  
 bfh.bfType=((WORD)('M'<< 8)|'B'); QNXS.!\P  
 bfh.bfSize=54+size; W3%RB[s-  
 bfh.bfOffBits=54; ,&Zk63V  
 CFile bf; U2Ky4UFm  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %y)hYLOJ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); i.-2 w6  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); CWd &  
  bf.WriteHuge(lpData,size); O%&N6U  
  bf.Close(); $"0`2C  
  nCount++; 'S#^ 70kt  
 } n2[h`zm1{B  
 GlobalFreePtr(lpData); 2IkyC`  
 if(nCount==1) }ZiJHj'<  
  m_Number.Format("%d picture captured.",nCount); :kjs: 6f]  
 else e\*(F3r  
  m_Number.Format("%d pictures captured.",nCount); '?X?'_3  
  UpdateData(FALSE); >+:cTQ|q  
} ##1/{9ywy  
MdTu722  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4"^W/Zo  
{ X@)'E9g5:  
 if(pMsg -> message == WM_KEYDOWN) ~1S,[5u|s  
 { F hyY+{%  
  if(pMsg -> wParam == VK_ESCAPE) mFd|JbW  
   return TRUE; 5,Co(K  
  if(pMsg -> wParam == VK_RETURN) jz\>VYi(7  
   return TRUE; 6hXh;-U  
 } 6_g6e2F  
 return CDialog::PreTranslateMessage(pMsg); YelF)Na  
} {?3i^Q=V  
Vk76cV D  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N7;kWQH  
{ @TzUc E  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ t+0/$  
  SaveBmp(); '68#7Hs.  
  return FALSE; ;^)4u  
} ;L%\[H>G  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;9Wimf]G,E  
 CMenu pop; cBCC/n  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |]Y6*uEX<  
 CMenu*pMenu=pop.GetSubMenu(0); @?0))@kPc3  
 pMenu->SetDefaultItem(ID_EXITICON); RE]*fRe7#  
 CPoint pt; GW.Y= S  
 GetCursorPos(&pt); scrss  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); izu_KBzy  
 if(id==ID_EXITICON) =">0\#  
  DeleteIcon(); lr -+|>M)  
 else if(id==ID_EXIT) =65XT^  
  OnCancel(); }me`(zp  
 return FALSE; `bd9N !K  
} i+I1h=  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); MOuEsm;  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) O8LIKD_I[  
 AddIcon(); b,(<74!#8  
 return res; v~YGef;D  
} .9<euPrz  
d zV2;  
void CCaptureDlg::AddIcon() @%^h|g8>Fu  
{ W&&C[@Jd3  
 NOTIFYICONDATA data; ~C?)- ]bF  
 data.cbSize=sizeof(NOTIFYICONDATA); KHeeB`V>J  
 CString tip; 7!6v4ZA  
 tip.LoadString(IDS_ICONTIP); y+Bxe )6^V  
 data.hIcon=GetIcon(0); )cm^;(#pV  
 data.hWnd=GetSafeHwnd(); )R"UX:Q>  
 strcpy(data.szTip,tip); =:H EF;!  
 data.uCallbackMessage=IDM_SHELL; =%b1EY k  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; b~TTz`HZ  
 data.uID=98; zq|NltK  
 Shell_NotifyIcon(NIM_ADD,&data);  ]l  
 ShowWindow(SW_HIDE); SUsdX[byb  
 bTray=TRUE; _0Y?(}  
} }0OQm?xh  
S*WLb/R2  
void CCaptureDlg::DeleteIcon() x3nUKQtk:8  
{ nKjT&R  
 NOTIFYICONDATA data; (>*L-&-  
 data.cbSize=sizeof(NOTIFYICONDATA); &uf|Le4  
 data.hWnd=GetSafeHwnd(); x5M+\?I<2  
 data.uID=98; Sa:;j4  
 Shell_NotifyIcon(NIM_DELETE,&data); W/%9=g$m  
 ShowWindow(SW_SHOW); D\DwBZ>  
 SetForegroundWindow(); 5hDPX \  
 ShowWindow(SW_SHOWNORMAL); TR'_v[uK3  
 bTray=FALSE; d"lk"R  
} :y_] JL;w  
"R% RI( y{  
void CCaptureDlg::OnChange() xhMAWFg|  
{ o9OCgP`Y  
 RegisterHotkey(); X*&Thmee  
} 9]I{GyH  
mCQ:< #  
BOOL CCaptureDlg::RegisterHotkey() ~/2OK!M  
{ B}N1}i+  
 UpdateData(); r( zn1;zl  
 UCHAR mask=0; t&_X{!1X"w  
 UCHAR key=0; FY/F}C,o  
 if(m_bControl) U8<C4  
  mask|=4; s/P+?8'9  
 if(m_bAlt) cSmy M~[  
  mask|=2; H9WXp&  
 if(m_bShift) e&NJj:Ph*  
  mask|=1; GX*9R>  
  key=Key_Table[m_Key.GetCurSel()]; r<Q0zKW!jN  
 if(bRegistered){ pK0@H"$8  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); LFvZ 7M\\  
  bRegistered=FALSE; 9)4_@rf%  
 } +IlQZwm~  
 cMask=mask; -<(RYMk*)  
 cKey=key; df&.!7_R`  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); gy"<[N .?c  
 return bRegistered; ,!P}Y[|  
} [Y^h)k{-$  
}gd'pgN"t  
  四、小结 Z,8t!Y  
*lQa^F  
  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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