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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: |f3 :9(p  
  7;9 Jn  
  一、实现方法 O+"a 0:GM  
3(`P x}  
  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: rGlnu.mK^  
n;LjKE  
#pragma data_seg("shareddata") [Om,Q<  
HHOOK hHook =NULL; //钩子句柄 a5?Yh<cJ  
UINT nHookCount =0; //挂接的程序数目 a= (vS  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \Vx_$E  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 6z2%/P-'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey g\1|<jb3  
static int KeyCount =0; .u:aX$t+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 :6J&%n  
#pragma data_seg() /vs79^&  
Ch_eK^ g1  
  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。 RMHJI6?LB  
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  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: }H:wgy`  
ej,R:}C%`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Y)2#\ F   
cKey,UCHAR cMask) -8yN6 0|  
{ hv*XuT/  
 BOOL bAdded=FALSE; r7FpR!  
 for(int index=0;index<MAX_KEY;index++){ 3.6Gh|7  
  if(hCallWnd[index]==0){ 1D1qOg"LE  
   hCallWnd[index]=hWnd; `L%<3/hF  
   HotKey[index]=cKey; 9V|) 3GF  
   HotKeyMask[index]=cMask; JnLF61   
   bAdded=TRUE; sh*/wM  
   KeyCount++; kS4YxtvB  
   break; r@EHn[w  
  } x/ix%!8J  
 } .Nk5W%7]=  
 return bAdded; wz>[CXpi_  
} #^{%jlmHxJ  
//删除热键 /[A#iTe  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K[S)e!\.  
{ VniU:A  
 BOOL bRemoved=FALSE; u.Tknw-X  
 for(int index=0;index<MAX_KEY;index++){ "s}Oeu[  
  if(hCallWnd[index]==hWnd){ OZEbs 7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O l;DJV  
    hCallWnd[index]=NULL; \1hQ7:f;\  
    HotKey[index]=0; K>TEt5  
    HotKeyMask[index]=0; 0 \V)DV.i  
    bRemoved=TRUE; e,MgR\F}  
    KeyCount--; tX6_n%/L  
    break; n=?wX#rEC#  
   } *fz#B/ _o  
  } 10xza=a  
 } a(LtiO  
 return bRemoved; FKUo^F?z  
} Bj GfUQ  
I&`aGnr^^  
GT\ yjrCd  
  DLL中的钩子函数如下:  ozKS<<  
l,Fn_zO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fL*+[v4  
{ }<zbx*!  
 BOOL bProcessed=FALSE; +S WtHj7e  
 if(HC_ACTION==nCode) ]Ljb&*IEj  
 { Q\>mg*79  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 X#HH7V>  
   switch(wParam) nu Vux5:  
   {  %y7ZcH'  
    case VK_MENU: K0D|p$v  
     MaskBits&=~ALTBIT; zB/VS_^^W:  
     break; o]]sm}3N  
    case VK_CONTROL: tu(^D23  
     MaskBits&=~CTRLBIT; \01 kK)  
     break; ?Qx4Z3n  
    case VK_SHIFT: DP;:%L}  
     MaskBits&=~SHIFTBIT; j+e~ tCcN/  
     break; t+K1ArQc  
    default: //judge the key and send message :^U>n{   
     break; y06xl:iQwF  
   } C_JO:$\rE  
   for(int index=0;index<MAX_KEY;index++){ Kv)}  
    if(hCallWnd[index]==NULL) Fv$A%6;W  
     continue; PpH ;p.-!d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {rK]Q! yj  
    { (UCCEQq5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); LzD RyL  
     bProcessed=TRUE; T+B8SZw#}!  
    } q|0l>DPRp  
   } u-tD_UIck  
  } +TX4,"  
  else if((lParam&0xc000ffff)==1){ //有键按下 pjl>ZoOM  
   switch(wParam) e7bMK<:r  
   { *Mb'y d/|  
    case VK_MENU: 'oH3|  
     MaskBits|=ALTBIT; eoXbZ  
     break; Bl^ BtE?-b  
    case VK_CONTROL: >; tE.CJH  
     MaskBits|=CTRLBIT; yPY{ZADkQ  
     break; g*`xEb= '  
    case VK_SHIFT: Q*M(d\Vs  
     MaskBits|=SHIFTBIT; \w"~DuA  
     break; *K|ah:(r1\  
    default: //judge the key and send message zR <fz  
     break; 9gglyoZ%  
   } O;i0xWUh  
   for(int index=0;index<MAX_KEY;index++){ <EcxNj1  
    if(hCallWnd[index]==NULL) D _ 1O4/  
     continue; Ji:<eRx)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) NqGSoOjIO2  
    { !|j|rYi-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E m^Dg9  
     bProcessed=TRUE; hgzNEx%^q  
    } qozvNJm)  
   } y. 1F@w|  
  } 2i;ox*SfpU  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 cD=IFOB*GD  
   for(int index=0;index<MAX_KEY;index++){ N UJ $)qNA  
    if(hCallWnd[index]==NULL) |i #06jIq  
     continue; =FI[/"476  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) bC~I}^i\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5pC}ZgEa<  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 %K.rrn M  
   } $4~Z]-38#A  
  } G "!v)o  
 } ?L0k|7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9_,f)2)~W  
} `34{/ }w  
/HS"{@Z"h  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 0FY-e~xr  
&%GAPs%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iK+Vla`}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A_WaRYG  
F3]VSI6^E,  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Lq1?Y  
K#AexA  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &:IcwD&  
{ E/*&'Osq  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) cIG7 Q"4  
 { "a}fwg9Y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 z6rT<~xZtu  
  SaveBmp(); PHEQG]H S  
  return FALSE; kU=U u>  
 } m(}}%VeR"z  
 …… //其它处理及默认处理 2  
} &6 <a<S  
h_+  
PB7-`uz  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 j;7E+Yp  
D6l. x]K  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 9jX_Eoxy  
>KvK'Mus/  
  二、编程步骤 ^Y+Lf]zz*  
GN9kCyPK  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; a@ <-L  
%+Y wzL{  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ?@;)2B|q  
Z<^!N)  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ;^0rY)&  
4#7*B yvf  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; QIlZZ  
OG$v"Yf~  
  5、 添加代码,编译运行程序。 @\XeRx;  
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三、程序代码 _MLf58  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL 3)6-S  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) S*|/txE'~Y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "y&`,s5}  
#if _MSC_VER > 1000 .UNV &R0  
#pragma once !U>WAD9  
#endif // _MSC_VER > 1000 vNrn]v=|}7  
#ifndef __AFXWIN_H__ Z b$]9(RS  
#error include 'stdafx.h' before including this file for PCH Qubu;[0+a  
#endif 6]d]0TW_  
#include "resource.h" // main symbols qP<D9k>  
class CHookApp : public CWinApp SY[3O  
{ LX oJw$C  
 public: x.wDA3ys  
  CHookApp(); `>`b;A4  
  // Overrides |:JT+a1  
  // ClassWizard generated virtual function overrides Xa.8-a"hz  
  //{{AFX_VIRTUAL(CHookApp) {, +c  
 public: Ez0zk9  
  virtual BOOL InitInstance(); KXK5\#+L  
  virtual int ExitInstance(); H?8'(  
  //}}AFX_VIRTUAL (.V),NKG  
  //{{AFX_MSG(CHookApp) dXQC}JA  
  // NOTE - the ClassWizard will add and remove member functions here. F.5fasdX'  
  // DO NOT EDIT what you see in these blocks of generated code ! h]k $K  
  //}}AFX_MSG h_S>Q  
  DECLARE_MESSAGE_MAP() F;8Q`$n  
}; Q=fl!>P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %dg[ho  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,xVAJ6_#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (IVhj^dQm  
BOOL InitHotkey(); oD9n5/ozo  
BOOL UnInit(); _/noWwVu  
#endif O0xqA\  
|g)>6+?]W  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9jqsEd-SW  
#include "stdafx.h"  =g M@[2  
#include "hook.h" 3N|z^6`#  
#include <windowsx.h> Wu'qpJ  
#ifdef _DEBUG @`:X,]{  
#define new DEBUG_NEW Q=xXj'W-  
#undef THIS_FILE ){"?@1vP  
static char THIS_FILE[] = __FILE__; p^|l ',e  
#endif G%t>Ll``C  
#define MAX_KEY 100 PC<_1!M]  
#define CTRLBIT 0x04 @r/~Y]0Ye5  
#define ALTBIT 0x02 qJrKt=CE  
#define SHIFTBIT 0x01 $=N?[h&4  
#pragma data_seg("shareddata") /B~[,ES@1  
HHOOK hHook =NULL; J:glJ'4E  
UINT nHookCount =0; ,r;xH}tbi  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey n"6L\u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT XDPgl=~  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (H !iK,R  
static int KeyCount =0; l[ $bn!_ e  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift & rab,I"  
#pragma data_seg() |oXd4  
HINSTANCE hins; Q]/%Y[%|  
void VerifyWindow(); jd-]q2fQ|  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) SnmUh~`L~  
//{{AFX_MSG_MAP(CHookApp) *1<kYrB  
// NOTE - the ClassWizard will add and remove mapping macros here. 5HV+7zU5  
// DO NOT EDIT what you see in these blocks of generated code! @:9Gs!!  
//}}AFX_MSG_MAP Gb\PubJ  
END_MESSAGE_MAP() Dz6xx?  
3yKmuu!  
CHookApp::CHookApp() rFQWgWD  
{ n@p@ @  
 // TODO: add construction code here, ={zTQ+7S`  
 // Place all significant initialization in InitInstance 3EICdC  
} ^.!jD+=I  
G#GZt\)F  
CHookApp theApp; %NxQb'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \>- M&C  
{ }QE*-GVv]  
 BOOL bProcessed=FALSE; u/u(Z&  
 if(HC_ACTION==nCode) 3^+D,)#D^  
 { U*$xR<8v  
  if((lParam&0xc0000000)==0xc0000000){// Key up @i;)`k5b  
   switch(wParam) ?e<2'\5v  
   { }ARA K^%  
    case VK_MENU: K8_v5  
     MaskBits&=~ALTBIT; HT.*r6Y>g  
     break; yQ N{)rv  
    case VK_CONTROL: ^D$|$=|DH  
     MaskBits&=~CTRLBIT; \xCCJWek  
     break; =zcvR {Dkp  
    case VK_SHIFT: CC`_e^~y=F  
     MaskBits&=~SHIFTBIT; \toU zTT  
     break; $3g{9)}  
    default: //judge the key and send message lbBWOx/|  
     break; }Ze*/ p-  
   } LD}~]  
   for(int index=0;index<MAX_KEY;index++){ -9i7Ja  
    if(hCallWnd[index]==NULL) sE6>JaH  
     continue; *c94'Tcl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Lr$M k#'B  
    { {4G/HW28  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); K%? g6j  
     bProcessed=TRUE; j fY7ich  
    } Ey|_e3Lf[  
   }  Qw}1q!89  
  } !ka* rd  
  else if((lParam&0xc000ffff)==1){ //Key down !B}9gT  
   switch(wParam) 7t:RQ`$:  
   { yQD>7%x  
    case VK_MENU: SXm%X(JU  
     MaskBits|=ALTBIT; RDp  
     break; (O5Yd 6u  
    case VK_CONTROL: *{DTxEy  
     MaskBits|=CTRLBIT; W8^m-B&  
     break; zl|z4j'Irc  
    case VK_SHIFT: yijP  
     MaskBits|=SHIFTBIT; ro{!X,_$,  
     break; +1!iwmch>  
    default: //judge the key and send message Kf[d@ L  
     break; x?+w8jSR  
   } 'j6O2=1  
   for(int index=0;index<MAX_KEY;index++)  mLxgvp  
   { (?na|yd  
    if(hCallWnd[index]==NULL) @owneSD qN  
     continue; bx8](cT_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4VwF \  
    { m0"K^p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \g39>;iR  
     bProcessed=TRUE; USz~l7Xs  
    } rGyAzL]  
   } fORkH^Y(&  
  } K -U} sW  
  if(!bProcessed){ ,_Z(!| rW  
   for(int index=0;index<MAX_KEY;index++){ /uwi$~Ed  
    if(hCallWnd[index]==NULL) >%j%Mj@8q|  
     continue; J~k9jeq9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5 8bW  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Rqh5FzB>  
   } ,yYcjs!=o  
  } 4N,mcV  
 }   EO&Q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $oK&k}Q  
} *|fF;-#v  
+(3_V$|Dv  
BOOL InitHotkey() ::|~tLFu  
{ qz-QVY,  
 if(hHook!=NULL){ "?I#!t%'  
  nHookCount++; /o;M ?Nt6  
  return TRUE; t<!;shH,s  
 } j~Aq-8R=  
 else kOYUxr.b  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); w7V\_^&Id  
  if(hHook!=NULL) 7Q}pKq]P  
   nHookCount++; M3pE$KT0x  
  return (hHook!=NULL); u5(8k_7  
} pjWRd_h.  
BOOL UnInit() Yq+ 1kA  
{ Y^eN}@]?&  
 if(nHookCount>1){ x#>V50E  
  nHookCount--; _v,0"_"  
  return TRUE; hJb2y`,q  
 } ]:|B).  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .,bpFcQ  
 if(unhooked==TRUE){ i})s4%a  
  nHookCount=0; }e?H(nZS7h  
  hHook=NULL; L8VOiK=,  
 } ;o_F<68QP  
 return unhooked; !(GyOAb  
} P!eo#b^S  
Y}:~6`-jj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k{}> *pCU  
{ gxv^=;2C  
 BOOL bAdded=FALSE; m\L`$=eO8  
 for(int index=0;index<MAX_KEY;index++){ b2m={q(s  
  if(hCallWnd[index]==0){ Zse&{  
   hCallWnd[index]=hWnd; $9)os7H7  
   HotKey[index]=cKey; jf~](TK  
   HotKeyMask[index]=cMask; >HP `B2Q H  
   bAdded=TRUE; b(iF0U>&  
   KeyCount++; )kpEcMlR  
   break; N~v6K}`}  
  } wVBK Vb9N  
 } i(}Pr A  
 return bAdded; pHV^K v#  
} r;#"j%z  
!6!)H8rX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6Y9N= \`  
{ Kxr@!m"  
 BOOL bRemoved=FALSE; x'GB#svi  
 for(int index=0;index<MAX_KEY;index++){ !+GYu;_  
  if(hCallWnd[index]==hWnd){ $%y q[$^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ tn]nl!_@  
    hCallWnd[index]=NULL; )^>LnQ_u  
    HotKey[index]=0; 7'G;ijx  
    HotKeyMask[index]=0; J2bvHxb Rd  
    bRemoved=TRUE; j#l=%H  
    KeyCount--; t#k]K]  
    break; 0a~t  
   } m=dNJF  
  } !}(B=-  
 } 9`tK 9  
 return bRemoved;  G 3Z"U  
} D)d]o&  
FlqGexY5  
void VerifyWindow() @!sK@&ow@%  
{ d54iZ`  
 for(int i=0;i<MAX_KEY;i++){ @(t3<g  
  if(hCallWnd!=NULL){ =+zDE0Qs  
   if(!IsWindow(hCallWnd)){ uzYB`H<  
    hCallWnd=NULL; VmS_(bM  
    HotKey=0; |7qt/z  
    HotKeyMask=0; iQ'*QbP'Z  
    KeyCount--; ;J%:DD  
   } LOh2eZ"n  
  } M<vPE4TIr*  
 } SyWZOE%p  
} 50,'z?-_  
!nvwRQ  
BOOL CHookApp::InitInstance() FY1iY/\Cn  
{ E }L Hp  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Z(mUU]  
 hins=AfxGetInstanceHandle(); \ TV  
 InitHotkey(); Rs%`6et}\  
 return CWinApp::InitInstance(); 1[FN: hm  
} 5^B79A"}  
J=g)rd[`  
int CHookApp::ExitInstance() O2w-nd74U  
{ Pvxb6\G&d  
 VerifyWindow(); -`O{iHfM|P  
 UnInit(); f1 ;  
 return CWinApp::ExitInstance(); VD;*UkapZx  
} ^HKXm#vAB  
.wfydu)3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file SE'Im  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) d:=' Xs  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ t R^f]+Up  
#if _MSC_VER > 1000 u47<J?!Q  
#pragma once HIg2y  
#endif // _MSC_VER > 1000 kSAVFzUS  
T5XXC1+  
class CCaptureDlg : public CDialog w#A)B<Y/"  
{ s,z~qL6&  
 // Construction 19 !?oeOU  
 public: PX:#+bq1  
  BOOL bTray; ACszx\[K3  
  BOOL bRegistered; ,06Sm]4L,  
  BOOL RegisterHotkey(); 'Y 38VOI%  
  UCHAR cKey; ]C_+u_9  
  UCHAR cMask; BU`X_Z1)  
  void DeleteIcon(); -f+#j=FX  
  void AddIcon(); JcAsrtrG]  
  UINT nCount; \J'}CX*aQ  
  void SaveBmp(); ,f }$FZ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor R9XU7_3B  
  // Dialog Data t{md&k4  
  //{{AFX_DATA(CCaptureDlg) TW|K.t@5#H  
  enum { IDD = IDD_CAPTURE_DIALOG }; o) )` "^  
  CComboBox m_Key; f ULt4  
  BOOL m_bControl; K~W(ZmB  
  BOOL m_bAlt; MIMC(<   
  BOOL m_bShift; X/5m}-6d]  
  CString m_Path;  X\^nV  
  CString m_Number; [doEArwn  
  //}}AFX_DATA s68(jYC7[  
  // ClassWizard generated virtual function overrides dlu*s(O"  
  //{{AFX_VIRTUAL(CCaptureDlg) ?qh-#,O9B  
 public: "{q#)N  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ,9&cIUH  
 protected: !_fDL6a-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support WAu>p3   
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); NxP(&M(  
  //}}AFX_VIRTUAL &:&'70Ya  
  // Implementation *z0!=>(  
 protected:  a_?sJ  
  HICON m_hIcon; i|:!I)(lh  
  // Generated message map functions -|>~I#vY  
  //{{AFX_MSG(CCaptureDlg) G m~ ./-  
  virtual BOOL OnInitDialog(); `DM%a~^yg  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); sf*4|P}  
  afx_msg void OnPaint(); LrU8!r`a  
  afx_msg HCURSOR OnQueryDragIcon(); !=0h*=NOYt  
  virtual void OnCancel(); L\Se ,  
  afx_msg void OnAbout(); Dqy`7?Kn  
  afx_msg void OnBrowse(); (0-Ol9[  
  afx_msg void OnChange(); .j}]J:{%  
 //}}AFX_MSG ORM>|&  
 DECLARE_MESSAGE_MAP() YWZ;@,W  
}; @G5T8qwN  
#endif \Y P,}_ ~  
E7Lqa S  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file gV_v5sk  
#include "stdafx.h" q*I*B1p[m  
#include "Capture.h" c 1YDln  
#include "CaptureDlg.h" "@Vyc6L  
#include <windowsx.h> *22Vc2[i;  
#pragma comment(lib,"hook.lib") qO6M5g:   
#ifdef _DEBUG d$!Q6ux;  
#define new DEBUG_NEW =uP? ?E  
#undef THIS_FILE {>>X3I  
static char THIS_FILE[] = __FILE__; 3?Pg ;  
#endif mjeJoMvN)H  
#define IDM_SHELL WM_USER+1 b3A0o*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); R1];P*>%gZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BT7{]2?&V  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; gInh+XZs  
class CAboutDlg : public CDialog p-4$)w~6i  
{ mixsJ}e  
 public: JP#S/kJ%3  
  CAboutDlg(); ,54z9F`  
  // Dialog Data EU[\D;  
  //{{AFX_DATA(CAboutDlg) Gwd38  
  enum { IDD = IDD_ABOUTBOX }; #p}GWS)  
  //}}AFX_DATA O}M-6!%<,  
  // ClassWizard generated virtual function overrides +,e#uuj$p  
  //{{AFX_VIRTUAL(CAboutDlg) 4@9Pd &I  
 protected: +x]/W|5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [.#nM  
  //}}AFX_VIRTUAL sz9W}&(j  
  // Implementation bzr2Zj{4  
 protected: ]$smFF  
  //{{AFX_MSG(CAboutDlg) 'ZbWr*bo  
  //}}AFX_MSG 2B_|"J  
  DECLARE_MESSAGE_MAP() t2[/eM.G  
}; \VpEUU6^U  
gAAC>{Wh  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -S$F\%  
{ Xa`Q;J"h  
 //{{AFX_DATA_INIT(CAboutDlg) 7^dr[.Q[*  
 //}}AFX_DATA_INIT tZ_'>7)  
} ale'-V)5  
Fp\;j\pfw  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #Oka7.yz  
{ VN`.*B|9[  
 CDialog::DoDataExchange(pDX); 2KLMFI.F  
 //{{AFX_DATA_MAP(CAboutDlg) ibkB>n{(  
 //}}AFX_DATA_MAP U,g8:M xHK  
} H4g8 1V=  
~[;r) g\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ~P3b5 -  
 //{{AFX_MSG_MAP(CAboutDlg) BH:A]#_{  
 // No message handlers (`(D $%  
 //}}AFX_MSG_MAP J[ZHAnmPH  
END_MESSAGE_MAP() :nx+(xgw  
o=rR^Z$G   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) OZ&/&?!XE  
: CDialog(CCaptureDlg::IDD, pParent) ~$J ;yo~  
{ yqN`R\d  
 //{{AFX_DATA_INIT(CCaptureDlg) c p"K?)  
  m_bControl = FALSE; gUklP(T=u  
  m_bAlt = FALSE; K(;qd Ir  
  m_bShift = FALSE; ,rMf;/[  
  m_Path = _T("c:\\"); sVHF\{<  
  m_Number = _T("0 picture captured."); 4*XNk;Dx  
  nCount=0; E'x"EN  
  bRegistered=FALSE; M9iX_4  
  bTray=FALSE; #,#`< h!  
 //}}AFX_DATA_INIT SBxpJsW >  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #pvq9fss,}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); [F6 )Z[uG  
} Y`g oV  
:\^b6"}8  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )7 5 7   
{ j_<qnBeQ  
 CDialog::DoDataExchange(pDX); DTO_IP  
 //{{AFX_DATA_MAP(CCaptureDlg) {$8+n::  
  DDX_Control(pDX, IDC_KEY, m_Key); ~/rD _K  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Fb{N>*l.  
  DDX_Check(pDX, IDC_ALT, m_bAlt); $1.-m{Bd  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); HVa9b;  
  DDX_Text(pDX, IDC_PATH, m_Path); V0;"Qa@q  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1jKpLTSs  
 //}}AFX_DATA_MAP ^lp=4C9  
} Q.N!b 7r7  
~.T|n =  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) m.lR]!Y=w  
//{{AFX_MSG_MAP(CCaptureDlg) oJa}NH   
 ON_WM_SYSCOMMAND() #Z1%XCt  
 ON_WM_PAINT() z|pt)Xl  
 ON_WM_QUERYDRAGICON() z/\OtYz  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Mt.Cj;h@^[  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /43l}6I  
 ON_BN_CLICKED(ID_CHANGE, OnChange) e]~p:  
//}}AFX_MSG_MAP }m+Q(2  
END_MESSAGE_MAP() cZVx4y%kz  
u8c@q'_  
BOOL CCaptureDlg::OnInitDialog() TtkHMPlm_  
{ kL DpZ{  
 CDialog::OnInitDialog(); d88A.Z3w  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); oJA_" xp  
 ASSERT(IDM_ABOUTBOX < 0xF000); d*8*9CpO:  
 CMenu* pSysMenu = GetSystemMenu(FALSE); iq' PeVo  
 if (pSysMenu != NULL) k]p|kutQCy  
 { Va )W[I  
  CString strAboutMenu; %`i*SF(gV  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8\s#law  
  if (!strAboutMenu.IsEmpty()) SJ]6_4=y*  
  { |%|03}Q  
   pSysMenu->AppendMenu(MF_SEPARATOR); |OeWM  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [q|W*[B:@  
  } C>|.0:[%  
 } h(=<-p @  
 SetIcon(m_hIcon, TRUE); // Set big icon A:m+v{*`4  
 SetIcon(m_hIcon, FALSE); // Set small icon  qNJc*@s  
 m_Key.SetCurSel(0);  SCfp5W7~  
 RegisterHotkey(); 'vNju1sfk  
 CMenu* pMenu=GetSystemMenu(FALSE); B@*b 9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); kWW2N0~$  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #LR4%}mg  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND);  26p[x'W  
 return TRUE; // return TRUE unless you set the focus to a control !7DDPJ~  
} &dtst??  
>ZJ]yhbhK  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |$\K/]q -  
{ lJ;Wi  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Q/g!h}>(.  
 { uXc;!*  
  CAboutDlg dlgAbout; *47/BLys<  
  dlgAbout.DoModal(); GQYR`;>  
 } h^g0|p5  
 else j&X&&=   
 { ^=eC1 bQA  
  CDialog::OnSysCommand(nID, lParam); u)<]Pb})r  
 } D% jGK  
} G4'Ia$  
pa46,q&M  
void CCaptureDlg::OnPaint() ah*{NR)  
{ {dZ]+2Z~+  
 if (IsIconic()) ~B|m"qY{i  
 { 'i%r  
  CPaintDC dc(this); // device context for painting OjhX:{"59  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); t+a.,$U  
  // Center icon in client rectangle ^i|R6oO_5  
  int cxIcon = GetSystemMetrics(SM_CXICON);  %W~w\mT  
  int cyIcon = GetSystemMetrics(SM_CYICON); SV o?o|<  
  CRect rect; x/?ET1iGt  
  GetClientRect(&rect); 36Lkcda[  
  int x = (rect.Width() - cxIcon + 1) / 2; 1(@$bsgu2  
  int y = (rect.Height() - cyIcon + 1) / 2; c:m=9>3  
  // Draw the icon f- (i%  
  dc.DrawIcon(x, y, m_hIcon); %rrA]\C'  
 } HF0G=U}i  
 else JaUzu3*=  
 { wF`Y ,@  
  CDialog::OnPaint(); *b>RUESF  
 } `,6|6.8#  
} 9^F3r]bH  
qHZDo[  
HCURSOR CCaptureDlg::OnQueryDragIcon() s|WwB T  
{ P] *x6c^n  
 return (HCURSOR) m_hIcon; _Z(t**Zh6y  
} 1dLc/, |  
(T*$4KGV  
void CCaptureDlg::OnCancel() OK]QDb  
{ ,gw9R9 x_  
 if(bTray) <7]HM5h  
  DeleteIcon(); KAnV%j  
  CDialog::OnCancel(); estiS  
} ~5+RK16  
YH\9Je%jx  
void CCaptureDlg::OnAbout() ~yJ2@2I  
{ qt}M&=}8Q  
 CAboutDlg dlg; kQmkS^R  
 dlg.DoModal(); $.vm n,:.  
} 8</wQ6&|  
{R ),7U8  
void CCaptureDlg::OnBrowse() k7iko{5D  
{ |^l_F1+w  
 CString str; -  ]wT  
 BROWSEINFO bi;  p?f\/  
 char name[MAX_PATH]; [uU!\xe  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); AY5iTbL1  
 bi.hwndOwner=GetSafeHwnd(); Y5tyFi#w[  
 bi.pszDisplayName=name; ai-s9r'MI?  
 bi.lpszTitle="Select folder"; 7}VqXUwabx  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [XY%<P3D  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ;(?tlFc  
 if(idl==NULL) / :F^*]  
  return; %]Z4b;W[Y  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); '{AB{)1  
 str.ReleaseBuffer(); ~uc7R/3ss  
 m_Path=str; qA GjR!=^  
 if(str.GetAt(str.GetLength()-1)!='\\') ]P3m=/w  
  m_Path+="\\"; 12lX-~[["  
 UpdateData(FALSE); MoFM'a9  
} (|BY<Ac3  
v\,N"X(,  
void CCaptureDlg::SaveBmp() E<\$3G-do  
{ bq ED5;d'#  
 CDC dc; nx'c=gp  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); O=3/ qs6m  
 CBitmap bm; \I!mzo  
 int Width=GetSystemMetrics(SM_CXSCREEN); JVu j u$k  
 int Height=GetSystemMetrics(SM_CYSCREEN); nmU1xv_  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ZHK>0>;  
 CDC tdc; ;Xt <\^e  
 tdc.CreateCompatibleDC(&dc); ~gpxK{  
 CBitmap*pOld=tdc.SelectObject(&bm); Kd-1EU  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  )bF l-  
 tdc.SelectObject(pOld); yus3GqPI  
 BITMAP btm; a6LL]_&g  
 bm.GetBitmap(&btm); ZwDL  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; lfj5?y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); OL 0YjU@  
 BITMAPINFOHEADER bih; fF)Q;~_VA  
 bih.biBitCount=btm.bmBitsPixel; bKpy?5&>  
 bih.biClrImportant=0; +b-ON@9]J`  
 bih.biClrUsed=0; cp@Fj"  
 bih.biCompression=0; 2Xl+}M.:Y  
 bih.biHeight=btm.bmHeight; j+h+Y|4J  
 bih.biPlanes=1; `xzKRId0  
 bih.biSize=sizeof(BITMAPINFOHEADER); B4b'0p  
 bih.biSizeImage=size; |H t5a.  
 bih.biWidth=btm.bmWidth; z&gma Ywq  
 bih.biXPelsPerMeter=0; (S!UnBb&  
 bih.biYPelsPerMeter=0; kxhsDD$@p  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 59oTU  
 static int filecount=0; B2[f1IMI  
 CString name; }i!+d,|f  
 name.Format("pict%04d.bmp",filecount++); .rK0C)  
 name=m_Path+name; geR :FO;\  
 BITMAPFILEHEADER bfh; <gwRE{6U  
 bfh.bfReserved1=bfh.bfReserved2=0; Q|)>9m!tt  
 bfh.bfType=((WORD)('M'<< 8)|'B'); tQ9%rb  
 bfh.bfSize=54+size; R0=f`;  
 bfh.bfOffBits=54; sYS 8]JU  
 CFile bf; #p(c{L!  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ t,9+G<)>H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2V@5:tf  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); *5PQ>d G  
  bf.WriteHuge(lpData,size); naaKAZ!S  
  bf.Close(); YcA. Bn|as  
  nCount++; %k#+nad  
 } b23A&1X  
 GlobalFreePtr(lpData); n0=]C%wr  
 if(nCount==1) &|XgWZS5  
  m_Number.Format("%d picture captured.",nCount); ATkd#k%S  
 else  zjUQ]  
  m_Number.Format("%d pictures captured.",nCount); Gt&yz"?D  
  UpdateData(FALSE); %"f85VfZ  
} 9Q1%+zjjMq  
i?/Q7D<P  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ^^v3iCT  
{ J,Ki2'=  
 if(pMsg -> message == WM_KEYDOWN) 50MM05aC  
 { Tm`@5  
  if(pMsg -> wParam == VK_ESCAPE) rT` sY  
   return TRUE; h-PJC/>  
  if(pMsg -> wParam == VK_RETURN) eF%M2:&c;  
   return TRUE; SPV+ O{  
 } '^)'q\v'k  
 return CDialog::PreTranslateMessage(pMsg); k)3N0]q6  
} :\~>7VFg  
DoczQc-U+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }K)A jZ  
{ zh2<!MH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f$>_>E  
  SaveBmp(); \uTlwS  
  return FALSE; {LiJ=Ebt  
} 1vo3aF  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (n kg  
 CMenu pop; |>(Vo@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9\Gk)0  
 CMenu*pMenu=pop.GetSubMenu(0); eI ( S)q  
 pMenu->SetDefaultItem(ID_EXITICON); 2-'_Nwkl*  
 CPoint pt; >IS4  
 GetCursorPos(&pt); D]E=0+  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); h> bjG  
 if(id==ID_EXITICON) 2;sTSGDG  
  DeleteIcon(); D N!V".m`J  
 else if(id==ID_EXIT) B5 /8LEWw  
  OnCancel(); "1gIR^S%9  
 return FALSE; ^!B]V>L-  
} diNSF-wi,,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gN}$$vS  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) p|gVIsg[-e  
 AddIcon(); C1{Q 4(K%  
 return res; "S#$:92  
} [,U l  
K-]) RIM  
void CCaptureDlg::AddIcon() <p<6!tdO  
{ #om Gj&  
 NOTIFYICONDATA data; M%:\ry4:  
 data.cbSize=sizeof(NOTIFYICONDATA); yreH/$Ou 8  
 CString tip; 0 @#Jz#?  
 tip.LoadString(IDS_ICONTIP); oPs asa  
 data.hIcon=GetIcon(0); B4un6-<i  
 data.hWnd=GetSafeHwnd(); 2`Bb9&ut>  
 strcpy(data.szTip,tip); ,$!fyi[;C  
 data.uCallbackMessage=IDM_SHELL; =A5i84y.2u  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #^RIp>NN9  
 data.uID=98; nP*DZC0kE&  
 Shell_NotifyIcon(NIM_ADD,&data); 06HU6d ,  
 ShowWindow(SW_HIDE); ?MywA'N@x  
 bTray=TRUE; .~I:Hcf/  
} :Jyr^0`J  
_L)LyQD]T  
void CCaptureDlg::DeleteIcon() Gd C=>\]  
{ <!t;[ie?y  
 NOTIFYICONDATA data; Gu{1%bb#kL  
 data.cbSize=sizeof(NOTIFYICONDATA); fUvXb>f,  
 data.hWnd=GetSafeHwnd(); kDJYEI9j>  
 data.uID=98; JQ ?8yl  
 Shell_NotifyIcon(NIM_DELETE,&data); B[mZQ&Gz`a  
 ShowWindow(SW_SHOW); vV"YgN:  
 SetForegroundWindow(); %ly&~&0  
 ShowWindow(SW_SHOWNORMAL); LntRLB'  
 bTray=FALSE; '\QJ{/JV  
} :JBt qpo2  
MA{ZmPm)  
void CCaptureDlg::OnChange() I[A<e]uK  
{ nEUH;z  
 RegisterHotkey(); >Ch2Ep  
} Zah<e6L  
lrPIXIM  
BOOL CCaptureDlg::RegisterHotkey() NfQ QJ@*  
{ 6-$95.Y2  
 UpdateData(); s-6$C  
 UCHAR mask=0; L7lpOy4k  
 UCHAR key=0; M`7lYw\Or!  
 if(m_bControl)  uWMSn   
  mask|=4; .HTRvE`X  
 if(m_bAlt) k_1;YO BF  
  mask|=2; BV<_1 WT}  
 if(m_bShift) Foj|1zJS_  
  mask|=1; maSVqG  
  key=Key_Table[m_Key.GetCurSel()];  {y{O ze  
 if(bRegistered){ b!-=L&V  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); xGOmvn^lQ  
  bRegistered=FALSE; v#9i|  
 } S^1ZsD.  
 cMask=mask; bOYM-\ {y  
 cKey=key; i%i s<'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); v\(6uej^  
 return bRegistered; +bso4 }rS  
} q+qF;7dN@  
[fwk[qFa  
  四、小结 K d#(eGe  
gr!!pp;  
  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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