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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: KZ&8aulP  
  <sn^>5Ds  
  一、实现方法 y/ vE  
hoPCbjkov  
  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: 2}hEBw68  
HjL+Wg  
#pragma data_seg("shareddata") .hn "NXy  
HHOOK hHook =NULL; //钩子句柄 [9*+s  
UINT nHookCount =0; //挂接的程序数目 @_0XK)pW  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (i&:=Bfn)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Lw2EA 5  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey dTS 7l02  
static int KeyCount =0; l8jm7@.E  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 JrS|Ib)6  
#pragma data_seg() 4fQ<A <2/  
`Y8 F}%i[  
  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。 q,kdr)-  
/2 WGo-  
  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: ,uK }$l  
$M#G;W5c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR N9idk}T  
cKey,UCHAR cMask) 7oK!!Qd^w  
{ PWmFY'=  
 BOOL bAdded=FALSE; Pe~[qETv  
 for(int index=0;index<MAX_KEY;index++){ X`#vH8  
  if(hCallWnd[index]==0){ REc69Y.k  
   hCallWnd[index]=hWnd; THkg,*;:  
   HotKey[index]=cKey; }-!0d*I  
   HotKeyMask[index]=cMask; qgDd^0  
   bAdded=TRUE; j%Usui<DL  
   KeyCount++; +<&_1% 5+  
   break; g \&Z_  
  } `l'z#\  
 } <Zn]L:  
 return bAdded; b-\ 1D;]  
} 2w+w'Ag_R  
//删除热键 (HDR}!.E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) i=nd][1n  
{ h b_"E, `F  
 BOOL bRemoved=FALSE; B[epI3 R  
 for(int index=0;index<MAX_KEY;index++){ Y'mtMLfMc  
  if(hCallWnd[index]==hWnd){ 4ba[*R2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,F!zZNW9  
    hCallWnd[index]=NULL; cY0NQKUk~  
    HotKey[index]=0; )pbsvR_  
    HotKeyMask[index]=0; nD{o8;  
    bRemoved=TRUE; fX2sjfk  
    KeyCount--; X0.kQ  
    break; F}wy7s2i  
   } Kejp7 okb  
  } wQEsq<  
 } l1l=52r   
 return bRemoved; jEVDz  
} g1Ed:V]_  
m %]1~b}"  
o#fr5>h-w  
  DLL中的钩子函数如下: j 4!$[h  
x8 _f/2&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J;|a)Nw  
{ %68'+qz  
 BOOL bProcessed=FALSE; k#liYw I  
 if(HC_ACTION==nCode) O`K2mt\%  
 { lE'3UqK  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,)@njC?J  
   switch(wParam) X6 *4IE  
   {  <hvs{}TS  
    case VK_MENU: xy))}c%  
     MaskBits&=~ALTBIT; >J*x` a3Q  
     break; dhv?36uE  
    case VK_CONTROL: HCfme<'  
     MaskBits&=~CTRLBIT; hK+6S3-E z  
     break; > ~:Md  
    case VK_SHIFT: SO4?3wg7  
     MaskBits&=~SHIFTBIT; )0+6^[Tqq  
     break; 0Q?)?8_  
    default: //judge the key and send message `%;Hj _X}  
     break; KW-GVe%8f  
   } g&z8t;@  
   for(int index=0;index<MAX_KEY;index++){ E@,m +  
    if(hCallWnd[index]==NULL) ' Dp;fEU$  
     continue; o=J-Ju  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z36wWdRa6  
    { d^MRu#]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 'b)qP|  
     bProcessed=TRUE; _NefzZWUJ  
    } :aQ.:b(n  
   } mC2K &'[  
  } ~(nc<M[  
  else if((lParam&0xc000ffff)==1){ //有键按下 76H>ST@G|  
   switch(wParam) 7-:R{&3Lm:  
   { l^F ?^kP  
    case VK_MENU: (Zg'])  
     MaskBits|=ALTBIT; 50_[n$tqE  
     break; xt_:R~/[  
    case VK_CONTROL: aD]! eP/)  
     MaskBits|=CTRLBIT; 0FSNIPx  
     break; "i#aII+T  
    case VK_SHIFT: Jvc:)I1NE7  
     MaskBits|=SHIFTBIT;  bTU[E  
     break; vAp<Muj(a  
    default: //judge the key and send message <qg4Rz\c]  
     break; n,U?]mr  
   } ZDg(D"  
   for(int index=0;index<MAX_KEY;index++){ p8Z?R^$9H  
    if(hCallWnd[index]==NULL) <O5WY37"q  
     continue; hw$!LTB2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d~1uK-L]*  
    { rk6K0TQ8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); nr2 Q[9~  
     bProcessed=TRUE; _Jy7` 4B.  
    } )fHr]#v  
   } N=AHS  
  } U% q-#^A  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 F+"_]  
   for(int index=0;index<MAX_KEY;index++){ * xCY^_  
    if(hCallWnd[index]==NULL) h PL]B_<  
     continue; G4uG"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) I`zd:o]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5r`rstV  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 K+pVRDRcs  
   }  0:f]&Ng  
  } Xu8I8nAwl  
 } f WZ(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); u\V^g   
} 8[;vC$  
%x N${4)6  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: v\GVy[Qyv  
H4s~=iB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k,[*h-{8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >))CXGE  
#MKM.T,\t  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: #=t/wAE y:  
Jy5sZ }t[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fqhL"Ah   
{ "$XX4w M  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) %Yj%0  
 { J91[w?,  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 < Hkq  
  SaveBmp(); 12a`,~  
  return FALSE; /TyGZ@S>m  
 } gs5(~YiT6  
 …… //其它处理及默认处理 ,$0-I@*V  
} } vmRm*8z  
|RFBhB/u  
>~SS^I0  
  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。 6|zhqb|s  
5BJ E  
  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。 -~mgct5  
$#q`Y+;L2  
  二、编程步骤 TWzLJ63*  
1h&`mqY)L.  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; IdQ./@?  
X/yq<_ g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; p&h?p\IF  
z Fo11;*D  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Zge(UhZ  
 .qgUD  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; H5T_i$W  
G18w3BFx  
  5、 添加代码,编译运行程序。 yd).}@  
N% 4"9K  
三、程序代码 GC{M"q|_  
83n%pS4x  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL eXW|{asx  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <7M-?g:vj  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ y3zP`^  
#if _MSC_VER > 1000 L5-|-PP|;  
#pragma once MKl0 d  
#endif // _MSC_VER > 1000 _!nsEG VV  
#ifndef __AFXWIN_H__ q`VL i  
#error include 'stdafx.h' before including this file for PCH H"#ITL  
#endif f#\YX tR,k  
#include "resource.h" // main symbols wT4@X[5$  
class CHookApp : public CWinApp E5w;75,  
{ 9af.t  
 public: {'5"i?>s0>  
  CHookApp(); O`B,mgT(  
  // Overrides CIjc5^Y2  
  // ClassWizard generated virtual function overrides `ePC$Ovn  
  //{{AFX_VIRTUAL(CHookApp) !y= R)k  
 public: -QrC>3xZR  
  virtual BOOL InitInstance(); Mfj82rHg  
  virtual int ExitInstance(); ,%M[$S'  
  //}}AFX_VIRTUAL zxbf h/=  
  //{{AFX_MSG(CHookApp) VPe0\?!d  
  // NOTE - the ClassWizard will add and remove member functions here. FEaT}/h;  
  // DO NOT EDIT what you see in these blocks of generated code ! ?, S/>SP  
  //}}AFX_MSG DN*5q9.  
  DECLARE_MESSAGE_MAP() =~B"8@B  
}; CMXF[X)%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); K#0TD( "  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aQCu3T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ieFl4hh[G  
BOOL InitHotkey(); 8]ZzO(=@{  
BOOL UnInit(); .T| }rB<c  
#endif UEU/505  
=dmr ,WE  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #c^V %  
#include "stdafx.h" *m~-8_ >;  
#include "hook.h" +$h  
#include <windowsx.h> [_,as  
#ifdef _DEBUG *doNPp)m  
#define new DEBUG_NEW [9 W@<p  
#undef THIS_FILE e$# *t  
static char THIS_FILE[] = __FILE__; |A8@r&   
#endif 5(3O/C{?~  
#define MAX_KEY 100 "& ,ov#  
#define CTRLBIT 0x04 fw%`[( hK  
#define ALTBIT 0x02 CSO'``16  
#define SHIFTBIT 0x01 E TT46%Y  
#pragma data_seg("shareddata") (W ~K1]  
HHOOK hHook =NULL; UB/> Ro  
UINT nHookCount =0; ZJYn[\]  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1( pHC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Wg']a/m  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey lW+mH=  
static int KeyCount =0; -(qRC0V  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift NRi5 Vp2=  
#pragma data_seg() &X=7b@r  
HINSTANCE hins; CXa[%{[n  
void VerifyWindow(); 2KlQ[z4Ir  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) f"Zl JVa  
//{{AFX_MSG_MAP(CHookApp) ~}Xus?e  
// NOTE - the ClassWizard will add and remove mapping macros here. IH]9%d)  
// DO NOT EDIT what you see in these blocks of generated code! YX\vk/[|  
//}}AFX_MSG_MAP <ql,@*Y  
END_MESSAGE_MAP() kT% wt1T4  
d*gAL<M7E  
CHookApp::CHookApp() j~CnMKN  
{ {]0e=#hw  
 // TODO: add construction code here, ?'a8QJo  
 // Place all significant initialization in InitInstance H_+n_r*  
} dftBD  
T(b9b,ov)  
CHookApp theApp; x:Y9z_)O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JU 9GJ"  
{ 22gh!F%)  
 BOOL bProcessed=FALSE; j[>cv;h ;  
 if(HC_ACTION==nCode) {/'T:n#  
 { y0zMK4b  
  if((lParam&0xc0000000)==0xc0000000){// Key up U!wi;W2  
   switch(wParam) wP!X)p\  
   { :|S zD4Ag  
    case VK_MENU: A# {63_H  
     MaskBits&=~ALTBIT; bsIG1&n'T  
     break; K\Ea\b[  
    case VK_CONTROL: p_FM 2K7!  
     MaskBits&=~CTRLBIT; ]c.w+<  
     break; wQ}r/2n|^  
    case VK_SHIFT: _P>YG<*"kQ  
     MaskBits&=~SHIFTBIT; #[93$)Gd!  
     break; 8bIP"!=*W  
    default: //judge the key and send message i5,iJe0cA  
     break; 5xQ-f  
   } >=~\b  
   for(int index=0;index<MAX_KEY;index++){ $ghZ<Y2}9  
    if(hCallWnd[index]==NULL) }3pM,.  
     continue; @<.@ X*#I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) NYm"I`5w  
    { !`DRJ)h  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  T]#V  
     bProcessed=TRUE; <`H0i*|Ued  
    } sX>u.  
   } 9d(\/ 7  
  } =2Y;)wrF  
  else if((lParam&0xc000ffff)==1){ //Key down Shn,JmR  
   switch(wParam) ><V*`{bD9)  
   { m,l/=M  
    case VK_MENU: O%b byR2  
     MaskBits|=ALTBIT; F3tps jQ  
     break; gQ1 obT"|  
    case VK_CONTROL: 1b,a3w(:1  
     MaskBits|=CTRLBIT; e8m,q~%#/  
     break; 5>k:PKHL  
    case VK_SHIFT: @u~S!(7.Wi  
     MaskBits|=SHIFTBIT; baxZ>KNi  
     break; nm'l}/Ug  
    default: //judge the key and send message dC11kq qj  
     break; _z\/{  
   } /d`"WK,  
   for(int index=0;index<MAX_KEY;index++) ^^y eC|~N:  
   { Sg#XcTG  
    if(hCallWnd[index]==NULL) G7Nw}cVJ)  
     continue; zWsr|= [  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i\R0+ O{  
    { OM*_%UF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y\|#Lu>B  
     bProcessed=TRUE; &C 9hT  
    } 4aW@c<-r?  
   } FpoH m%+  
  } %!aU{E|@_  
  if(!bProcessed){ oA1_W).wJ  
   for(int index=0;index<MAX_KEY;index++){ TP }a9-9?  
    if(hCallWnd[index]==NULL) ys_2?uv  
     continue; Nw;qJ58@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _)A|JC!jId  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8tY>%A~^z  
   } 7& M-^Ev  
  } SI(f&T(  
 } | ,8z" g  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -<iP$,bq72  
} @[GV0*yz$  
e#Tv5O  
BOOL InitHotkey() +pofN-*%  
{ m]p{]6h  
 if(hHook!=NULL){ Q*ITs!~Z  
  nHookCount++; ;>6< u.N  
  return TRUE; wxN)d B  
 } (In{GA7 ;  
 else  rxY|&!f  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); _Q V=3UWP  
  if(hHook!=NULL) ) SV.|  
   nHookCount++; j=\h|^gA  
  return (hHook!=NULL); WI8}_){ d  
} N0`9/lr|  
BOOL UnInit() [Nyt0l "z  
{ blO4)7m  
 if(nHookCount>1){ l|5 h  
  nHookCount--; 2YD\KXDo  
  return TRUE; i FI74COam  
 } t,/ G  
 BOOL unhooked = UnhookWindowsHookEx(hHook); )"?4d[ 5  
 if(unhooked==TRUE){ ;vn0%g  
  nHookCount=0; uF ?[H -y  
  hHook=NULL; K)Y& I  
 } [W[{ 4 Xu  
 return unhooked; bS_#3T  
} #3uv^m LGa  
(vXr2Z<l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Sp `l>BL  
{ 7ZcF0h  
 BOOL bAdded=FALSE; ycA<l"  
 for(int index=0;index<MAX_KEY;index++){ *$p*'vR  
  if(hCallWnd[index]==0){ h my%X`%j  
   hCallWnd[index]=hWnd; r )|3MUj  
   HotKey[index]=cKey; i~B?p[  
   HotKeyMask[index]=cMask; 8}/DD^M  
   bAdded=TRUE; 0G%9 @^B  
   KeyCount++; s!6lZ mPM  
   break; 5Xy(za  
  } ;(Yb9Mr)z  
 } "ra$x2|=}  
 return bAdded; ('J/Ww<  
} o3WOp80hz  
ChBf:`e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,H7X_KbFD4  
{ Ee>VA_ss  
 BOOL bRemoved=FALSE; dQ:,pe7A  
 for(int index=0;index<MAX_KEY;index++){ ?hoOSur+  
  if(hCallWnd[index]==hWnd){ A(Ct^/x-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ b?wrOS  
    hCallWnd[index]=NULL; Mz+I YP`L  
    HotKey[index]=0; ULx:2jz  
    HotKeyMask[index]=0; 1{uxpYAP=  
    bRemoved=TRUE; kG^76dAQL  
    KeyCount--; n ]%2Kx  
    break; B|`?hw@g+  
   } |x[I!I7.F  
  } a@}.96lStD  
 } iTxWXij  
 return bRemoved;  _"DC )  
} %h. zkocM  
g)Z8WH$;H3  
void VerifyWindow() q(sTKT[V  
{ 6)[moR{N1  
 for(int i=0;i<MAX_KEY;i++){ "1o{mvCkR  
  if(hCallWnd!=NULL){ )\wkVAm  
   if(!IsWindow(hCallWnd)){ PgtLyzc  
    hCallWnd=NULL; Ku5||u.F4*  
    HotKey=0; X'A`" }=_  
    HotKeyMask=0; Bwg(f_[1  
    KeyCount--; uHbg&eW  
   } v>X!/if<y  
  } EEe$A?a;  
 } ]3r}>/2(  
} Upz)iOqLi  
y4\X~5kU  
BOOL CHookApp::InitInstance() iSfRJ:_&6  
{ 44CZl{pt  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [8ZDMe  
 hins=AfxGetInstanceHandle(); jaS<*_~#R  
 InitHotkey(); ammi4k/  
 return CWinApp::InitInstance(); fe .=Z&  
} 5SFr E`  
}G4I9Py  
int CHookApp::ExitInstance() "&L8d(ZuA  
{ ,%!m%+K9a  
 VerifyWindow(); ?;~!C2Zs  
 UnInit(); N2:Hdu :  
 return CWinApp::ExitInstance(); XJul~"  
} T!/o^0w  
"LlpZtw  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >Eh U{@Y  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n6Oz[7M  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ QO@86{u#Y  
#if _MSC_VER > 1000 pl8b&bLzi  
#pragma once  %:26v  
#endif // _MSC_VER > 1000 d+n2 c`i  
{lK2yi  
class CCaptureDlg : public CDialog <ZT C^=3  
{ eP~bl   
 // Construction wd:Yy  
 public:  9q X$  
  BOOL bTray; &%J{uRp  
  BOOL bRegistered; @@R Mm$  
  BOOL RegisterHotkey(); i)l0[FNI}  
  UCHAR cKey; tPyk^NJ;  
  UCHAR cMask; pPL=(9d  
  void DeleteIcon(); $S>'0mL  
  void AddIcon(); V|Bwle  
  UINT nCount; eKLvBa-{@  
  void SaveBmp(); }6Pbjm*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor AA\)BNM  
  // Dialog Data <B@NSj  
  //{{AFX_DATA(CCaptureDlg) F .S^KK  
  enum { IDD = IDD_CAPTURE_DIALOG }; F:/x7]7??Z  
  CComboBox m_Key; 1dvP2E  
  BOOL m_bControl; ` wa;@p+j8  
  BOOL m_bAlt; MlTC?Rp#  
  BOOL m_bShift; XPhP1 ^>\  
  CString m_Path; Dgz, Uad8f  
  CString m_Number; 8Z !%rS  
  //}}AFX_DATA ,ye}p 1M  
  // ClassWizard generated virtual function overrides %g :Q?   
  //{{AFX_VIRTUAL(CCaptureDlg) c5p,~z_Dtu  
 public: {@X>!]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); j$ T12  
 protected: AojL4H|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y\v#qFVOZ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~\=D@G,9  
  //}}AFX_VIRTUAL l8~(bq1  
  // Implementation izSX  
 protected: ~vTwuc\(H  
  HICON m_hIcon; eEXNEgbn  
  // Generated message map functions cB&_':F  
  //{{AFX_MSG(CCaptureDlg) yPE3Awh5  
  virtual BOOL OnInitDialog(); kA=5Kc  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); kq| !{_  
  afx_msg void OnPaint(); h6k" D4o\  
  afx_msg HCURSOR OnQueryDragIcon(); -1Tr!I:1  
  virtual void OnCancel(); AL":j6!OQ  
  afx_msg void OnAbout(); 20I`F>-*  
  afx_msg void OnBrowse(); 4eWv).  
  afx_msg void OnChange(); ]9_gbQ   
 //}}AFX_MSG eipg,EI  
 DECLARE_MESSAGE_MAP() +-tFgXG  
}; pW+uVv,  
#endif Y. J!]|  
\W=3P[gb  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file D%+yp  
#include "stdafx.h" FS}b9sQ)  
#include "Capture.h" G^B> C  
#include "CaptureDlg.h" RB4n>&Y  
#include <windowsx.h> k86TlQRh  
#pragma comment(lib,"hook.lib") g$]WKy(D  
#ifdef _DEBUG 89>}`:xS^  
#define new DEBUG_NEW af<h2 r  
#undef THIS_FILE np2&W'C/i  
static char THIS_FILE[] = __FILE__; p2Khfl6-  
#endif *AV%=   
#define IDM_SHELL WM_USER+1 mr7Oi `dE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D>k(#vYKB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XQ~Xls%]   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; U4 *u|A  
class CAboutDlg : public CDialog YE@yts  
{ XaCvBQ  
 public: jyD~ER}J  
  CAboutDlg(); 7c"Csq/]I  
  // Dialog Data R'sNMWM  
  //{{AFX_DATA(CAboutDlg) 1\}XL=BE  
  enum { IDD = IDD_ABOUTBOX }; 6):1U  
  //}}AFX_DATA ' pgP QM<  
  // ClassWizard generated virtual function overrides xc*a(v0  
  //{{AFX_VIRTUAL(CAboutDlg) ~AjPa}@ f  
 protected: umns*U%T;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support id" `o  
  //}}AFX_VIRTUAL i&m_G5u88  
  // Implementation 2.WI".&y=  
 protected: %16Lo<DPm  
  //{{AFX_MSG(CAboutDlg) WOZuFS13  
  //}}AFX_MSG %|e)s_%XE  
  DECLARE_MESSAGE_MAP() -E1-(TS  
}; d<d3j9u(#  
CNb(\]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @'>RGaPV  
{ .X%J}c$  
 //{{AFX_DATA_INIT(CAboutDlg) i.'"`pn_  
 //}}AFX_DATA_INIT 7d R?70Sz  
} Nl[&rZ-&  
S3/%;=|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1J0gjO)AZ  
{ {U2AAQSa  
 CDialog::DoDataExchange(pDX); HL&HY)W1gf  
 //{{AFX_DATA_MAP(CAboutDlg) 0)SRLHTY%  
 //}}AFX_DATA_MAP dV[G-p  
} <oJ?J^  
t$du|q(  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rO>'QZ%  
 //{{AFX_MSG_MAP(CAboutDlg) /69yR   
 // No message handlers RWv4/=}(G  
 //}}AFX_MSG_MAP cW>=/  
END_MESSAGE_MAP() 6YU,> KP  
#I?Z,;DI=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) QL8C!&=  
: CDialog(CCaptureDlg::IDD, pParent) 7Tk//By7  
{ sJx_X8  
 //{{AFX_DATA_INIT(CCaptureDlg) fD@d.8nXd  
  m_bControl = FALSE; Xr=BxBttp  
  m_bAlt = FALSE; N `:MF 9  
  m_bShift = FALSE; Yw#fQFm  
  m_Path = _T("c:\\"); IQU1 JVk Z  
  m_Number = _T("0 picture captured."); @]q^O MLY  
  nCount=0; Bc.de&Bxz_  
  bRegistered=FALSE; K?J_cnJ`  
  bTray=FALSE; ke8g tbm  
 //}}AFX_DATA_INIT -XXsob}/8  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .KKecdd?=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); S[!6Lw  
} Dx1(}D  
x)=l4A\  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?:3hp2k<  
{ n4!RGq.}  
 CDialog::DoDataExchange(pDX); .iy>N/u  
 //{{AFX_DATA_MAP(CCaptureDlg) !.,J;Qt  
  DDX_Control(pDX, IDC_KEY, m_Key); M>Q ZN  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); gdeM,A|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); D&F{0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [hSJ)IZh  
  DDX_Text(pDX, IDC_PATH, m_Path); keLeD1  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1Sz tN3'q  
 //}}AFX_DATA_MAP AE>W$x8P  
} Bk\Y v0  
msgR"T3'  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) o3hgkoF   
//{{AFX_MSG_MAP(CCaptureDlg) ;Tr,BfV|Bf  
 ON_WM_SYSCOMMAND() F}{%*EJ  
 ON_WM_PAINT() QP.Lq }  
 ON_WM_QUERYDRAGICON() -9FGFBm4]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ld ]*J}cw  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1s(T#jh  
 ON_BN_CLICKED(ID_CHANGE, OnChange) YA,~qT|  
//}}AFX_MSG_MAP lND2Kb  
END_MESSAGE_MAP() OC*28)  
z |llf7:  
BOOL CCaptureDlg::OnInitDialog() 4 9N.P;b  
{ nrMW5>&-`  
 CDialog::OnInitDialog(); > )< ?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); z(A[xN@/W<  
 ASSERT(IDM_ABOUTBOX < 0xF000); 1W'Ai"DLw  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %?+vtX  
 if (pSysMenu != NULL) H;4QuB'^  
 { u ,3B[  
  CString strAboutMenu; W9]z]6  
  strAboutMenu.LoadString(IDS_ABOUTBOX); BeLD`4K  
  if (!strAboutMenu.IsEmpty()) Rm=p}  
  { (a#gCG\  
   pSysMenu->AppendMenu(MF_SEPARATOR); DAb/B  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); r|UJJ9i  
  } 1l$ C3c  
 } pM@8T25=  
 SetIcon(m_hIcon, TRUE); // Set big icon GqxnB k1  
 SetIcon(m_hIcon, FALSE); // Set small icon dvjj"F'Bf  
 m_Key.SetCurSel(0); f2x!cL|Kx?  
 RegisterHotkey(); '27$x&6>S  
 CMenu* pMenu=GetSystemMenu(FALSE); 5h/,*p6Nje  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); OUUV8K  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "jyo'r  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^'E^*R  
 return TRUE; // return TRUE unless you set the focus to a control 6}-No  
} W"Y)a|rG%  
Ur#jJR@%3  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +Mq\3  
{ P4Pc;8T@!  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) SM8N*WdiU  
 { 8^}/T#l  
  CAboutDlg dlgAbout; A .&c>{B7  
  dlgAbout.DoModal(); j7Fb4;o{  
 } ~Pw9[ycn3  
 else :W0p3 6"  
 { @$r[$D v  
  CDialog::OnSysCommand(nID, lParam); **%&|9He  
 } $x'jf?zs!  
} pL1ABvBB  
Rb:H3zh  
void CCaptureDlg::OnPaint() x3cjyu<K  
{ r%f Q$q>  
 if (IsIconic()) %]}JWXo f  
 { ?pZU'5le`  
  CPaintDC dc(this); // device context for painting 5zBA]1PY  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); LH(P<k&  
  // Center icon in client rectangle FDD=I\Ic  
  int cxIcon = GetSystemMetrics(SM_CXICON); Ck )W=  
  int cyIcon = GetSystemMetrics(SM_CYICON); Zb=NcEPGy  
  CRect rect; J[:#(c&c!1  
  GetClientRect(&rect); ^(^P#EEG  
  int x = (rect.Width() - cxIcon + 1) / 2; m@XX2l9:9  
  int y = (rect.Height() - cyIcon + 1) / 2; ;/$pxD  
  // Draw the icon |1!fuB A  
  dc.DrawIcon(x, y, m_hIcon); `.J)Z=o  
 } ,5 ka{Q`K  
 else ((A@VcX  
 { 0a89<yX  
  CDialog::OnPaint(); Ob]\t/:%P  
 } b5)^g+8)w  
} "b`#RohCi  
dh`s^D6Q>  
HCURSOR CCaptureDlg::OnQueryDragIcon() [T_[QU:A  
{ aeUgr !  
 return (HCURSOR) m_hIcon; jdG2u p  
} HSNj  
;S U<T^a  
void CCaptureDlg::OnCancel() ?h4[yp=w  
{ %cn 1d>M+I  
 if(bTray) 8_!qoW@B  
  DeleteIcon(); Y^Buz<OiG  
  CDialog::OnCancel(); &*OwoTgk+  
} :ir#7/  
HjA~3l7  
void CCaptureDlg::OnAbout() E~}H,*)  
{ $a~  
 CAboutDlg dlg; -lJ|x>PG'  
 dlg.DoModal(); a?+C]u?_D  
} c;]\$#2  
\;Q(o$5<  
void CCaptureDlg::OnBrowse() n )X%&_  
{ P 2_!(FZ<l  
 CString str; C&Q[[k"kb  
 BROWSEINFO bi; lVT*Ev{&.  
 char name[MAX_PATH]; tRU/[?!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >97YK =  
 bi.hwndOwner=GetSafeHwnd(); CbM~\6 R  
 bi.pszDisplayName=name; NOs00H  
 bi.lpszTitle="Select folder"; >bV3~m$a+  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?<t?G  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); dYISjk@  
 if(idl==NULL)  it H  
  return; @I4HpY7:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); F'[Y.tA ,#  
 str.ReleaseBuffer(); aQ(P#n>a2  
 m_Path=str; d3rjj4N"z  
 if(str.GetAt(str.GetLength()-1)!='\\') E|;>!MMA;  
  m_Path+="\\"; S*G^U1Sc+  
 UpdateData(FALSE); E|9`J00  
} =)+^y}xb  
gH(#<f@ZI  
void CCaptureDlg::SaveBmp() ,Dv*<La`\  
{ \uHC9}0  
 CDC dc; Ag0 6M U  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #@ HlnF}T  
 CBitmap bm; u|wl;+.  
 int Width=GetSystemMetrics(SM_CXSCREEN); $Mg O)bH  
 int Height=GetSystemMetrics(SM_CYSCREEN); h$`m0-'  
 bm.CreateCompatibleBitmap(&dc,Width,Height); I@m(}  
 CDC tdc; G_=i#Tu[  
 tdc.CreateCompatibleDC(&dc); c=tbl|Cq  
 CBitmap*pOld=tdc.SelectObject(&bm); }5PC53q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 'yH  
 tdc.SelectObject(pOld); &V+_b$  
 BITMAP btm; vX>{1`e{S  
 bm.GetBitmap(&btm); ,$t1LV;o=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; g0B-<>E  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &<*M{GW'&  
 BITMAPINFOHEADER bih; SN"Y@y)=  
 bih.biBitCount=btm.bmBitsPixel; C"n!mr{srt  
 bih.biClrImportant=0; 4PD5i  
 bih.biClrUsed=0; )kjQ W&)g  
 bih.biCompression=0; w|G7h=  
 bih.biHeight=btm.bmHeight; fPTLPcPP  
 bih.biPlanes=1; TqN@l\  
 bih.biSize=sizeof(BITMAPINFOHEADER); v @M6D}  
 bih.biSizeImage=size; }~LGq.H  
 bih.biWidth=btm.bmWidth; N}/V2K]Q  
 bih.biXPelsPerMeter=0;  lPz`?Hn  
 bih.biYPelsPerMeter=0; ]lKUpsQI  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); d1.@v;  
 static int filecount=0; L %acsb}  
 CString name; XPrnQJ  
 name.Format("pict%04d.bmp",filecount++); `&x>2FJ  
 name=m_Path+name; Y*9vR~#H  
 BITMAPFILEHEADER bfh; S@pdCH, n  
 bfh.bfReserved1=bfh.bfReserved2=0; #@YKNS[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ge=6l0  
 bfh.bfSize=54+size; U4dfO=  
 bfh.bfOffBits=54; }#.OJub  
 CFile bf; MjQ>& fUK  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6miXaAA8  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); xr.;B`T0\'  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ;C=d( pY  
  bf.WriteHuge(lpData,size); -}xK> ["  
  bf.Close(); mW)kWuOO  
  nCount++; N:64Gko"K  
 } >P(.yQ8&kL  
 GlobalFreePtr(lpData); /Cwwz  
 if(nCount==1) jHT^I as  
  m_Number.Format("%d picture captured.",nCount); _t]Q*i0p  
 else z{BgAI,  
  m_Number.Format("%d pictures captured.",nCount); r-S%gG}~E  
  UpdateData(FALSE); v" #8^q  
} Edc3YSg%;  
g3'dkS!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) PfYeV/M|  
{ ]4c*Nh%8  
 if(pMsg -> message == WM_KEYDOWN) DJdhOLx  
 { Q& d;UVp  
  if(pMsg -> wParam == VK_ESCAPE) HqqMX`Rof  
   return TRUE; ;xh.95BP`  
  if(pMsg -> wParam == VK_RETURN) =_E$* }  
   return TRUE; 8@;R2]Q  
 } IV1O/lGp  
 return CDialog::PreTranslateMessage(pMsg); '%e@7Cs  
} g}6M+QNj  
|2TH[J_a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j."V>p8u$  
{ KJ&I4CU]^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j-aTpN  
  SaveBmp(); 4+>~Ui_#  
  return FALSE; pIrL7Pb0  
} Q+a&a]*KL^  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !+Cc^{  
 CMenu pop; TG?>;It&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); R'F\9eyA  
 CMenu*pMenu=pop.GetSubMenu(0); -{A64gfFxT  
 pMenu->SetDefaultItem(ID_EXITICON); }|/<!l+;$  
 CPoint pt; e GAto  
 GetCursorPos(&pt); 3`3my=   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); qMVuBv  
 if(id==ID_EXITICON) LhF;A~L  
  DeleteIcon(); lM#/F\  
 else if(id==ID_EXIT) ;O>zA]Z8r  
  OnCancel(); .j)DE}[q>  
 return FALSE; Ao\OU}  
} 2b\ h@VJt  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,3G B9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dJQwb  
 AddIcon(); "kc%d'c(  
 return res; 0"\js:-$  
} yHf^6|$8  
Ug#B( }/  
void CCaptureDlg::AddIcon() 6R3/"&P(/#  
{ Y*jkUQ  
 NOTIFYICONDATA data; NP\/9 8|1  
 data.cbSize=sizeof(NOTIFYICONDATA); 1'&HmBfcb  
 CString tip; R SWw4}  
 tip.LoadString(IDS_ICONTIP); k'"R;^~xg  
 data.hIcon=GetIcon(0); g( "[wqgG  
 data.hWnd=GetSafeHwnd(); NeEV=+<-G  
 strcpy(data.szTip,tip); ^8ilUu  
 data.uCallbackMessage=IDM_SHELL; %,8 "cM`D  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~}D"8[ABj  
 data.uID=98; W+V &  
 Shell_NotifyIcon(NIM_ADD,&data); +*qTZIXj  
 ShowWindow(SW_HIDE); e9k$5ps  
 bTray=TRUE; 2jQ?-/Q8#  
} sx[mbKj<  
R6GlQ G  
void CCaptureDlg::DeleteIcon() F CfU=4O  
{ N4yQ,tG>aa  
 NOTIFYICONDATA data; }vF=XA  
 data.cbSize=sizeof(NOTIFYICONDATA); rc{F17~vX  
 data.hWnd=GetSafeHwnd(); }&Xf<6  
 data.uID=98; KAy uv  
 Shell_NotifyIcon(NIM_DELETE,&data); up?S (.*B  
 ShowWindow(SW_SHOW); nl-tJ.MU"  
 SetForegroundWindow(); q"g4fzCD  
 ShowWindow(SW_SHOWNORMAL); aHle s5   
 bTray=FALSE; (iO/@iw  
} 2-duzc  
lz#@_F|.*  
void CCaptureDlg::OnChange() ,{RWs^W2  
{ _(@ezX.p  
 RegisterHotkey(); 'Hq#9?<2M  
} &xFs0R i(  
mL s>RR#b  
BOOL CCaptureDlg::RegisterHotkey() /-ewCCzZV  
{ =\jPnov!  
 UpdateData(); g3'yqIjQL  
 UCHAR mask=0; >ufN[ab  
 UCHAR key=0; 4Z{ r  
 if(m_bControl) N?s5h?  
  mask|=4; 2ZMVYa2%(  
 if(m_bAlt) u |ru$cIo  
  mask|=2; C #@5:$  
 if(m_bShift) S)@) @3  
  mask|=1; _~b]/]|z#N  
  key=Key_Table[m_Key.GetCurSel()]; Oimq P  
 if(bRegistered){ (Vy`u)gG  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); l\=He  
  bRegistered=FALSE; KJ6:ZTbW  
 } &K,rNH'R  
 cMask=mask; +d8?=LX  
 cKey=key; JZrZDW>M  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  B}h8c  
 return bRegistered; \v.YP19  
} S\11 8TpD  
<:0d%YB)  
  四、小结 =/^{Pn  
E K^["_*A  
  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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