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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: q)PSHr=Z  
  N6v*X+4JH  
  一、实现方法 y2PxC. -  
&zPM# Q  
  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: u1|v3/Q-  
qc3?Aplj  
#pragma data_seg("shareddata") W+.?J 60  
HHOOK hHook =NULL; //钩子句柄 PPh1y;D  
UINT nHookCount =0; //挂接的程序数目 !q8A!P4|'  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 kdMB.~(K=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 {"0n^!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey !v*#E{r"g=  
static int KeyCount =0; wKJK!P  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 9lX[rBZ  
#pragma data_seg() V/)3d  
/x /W>J2  
  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。 hysxHOL  
\\/ !I   
  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: =|d5V%mK  
3]>YBbXvE  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR }'\M}YM  
cKey,UCHAR cMask) E8o9ufj3  
{ Y3xEFqMU  
 BOOL bAdded=FALSE; 8g/r8u~  
 for(int index=0;index<MAX_KEY;index++){ R!WeSgKCs  
  if(hCallWnd[index]==0){ cSj(u%9}  
   hCallWnd[index]=hWnd; k,y#|bf,Y  
   HotKey[index]=cKey; ">s0B5F7  
   HotKeyMask[index]=cMask; kEg~yN  
   bAdded=TRUE; :0Fwaw9PH"  
   KeyCount++; lb]k"L%KU7  
   break; eh*F/Gu  
  } ^fM=|.?  
 } 5 d|+c<  
 return bAdded; "H{#ib_c_  
} ~'):1}KN]  
//删除热键 7.C]ZcU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &0mhO+g   
{ *gI9CVfQl  
 BOOL bRemoved=FALSE; 6uFGq)4p@  
 for(int index=0;index<MAX_KEY;index++){ ND5E`Va5R  
  if(hCallWnd[index]==hWnd){ /PkOF ((  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lqKwjJ tX  
    hCallWnd[index]=NULL; t;[Q&Jl  
    HotKey[index]=0; + >v{#A_u  
    HotKeyMask[index]=0;  uMBb=   
    bRemoved=TRUE; *1}vn%wvn  
    KeyCount--; ^N~Jm&I  
    break; :wJ!rn,4  
   } SHC VjI6  
  } T f^O(  
 } .gI9jRdKw  
 return bRemoved; UKSI"/8I  
} c:}K(yAdd  
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,qlFk|A|  
  DLL中的钩子函数如下: *tT5Zt/&Sr  
Zn'y"@%t[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) l1RFn,Tzr  
{ 3*b!]^d:D  
 BOOL bProcessed=FALSE; 5xG/>f n  
 if(HC_ACTION==nCode) W/;qMP1"-  
 { J15$P8J  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 . LNqU#a  
   switch(wParam) ;Y16I#?;Kh  
   {  u"a$/  
    case VK_MENU: 4U:+iumy2  
     MaskBits&=~ALTBIT; )5bdWJ>l  
     break; ?r~](l   
    case VK_CONTROL: fI0L\^b%  
     MaskBits&=~CTRLBIT; fmq^AnKd  
     break; BcoE&I?[m|  
    case VK_SHIFT: 5(OF~mX#  
     MaskBits&=~SHIFTBIT; RbNRBK!{  
     break; gM3gc;  
    default: //judge the key and send message UJF }Ye  
     break; 3'2}F%!Mv  
   } x]U (EX`t$  
   for(int index=0;index<MAX_KEY;index++){ ]t3 NA*mM  
    if(hCallWnd[index]==NULL) Afa{f}st  
     continue; X]*W +  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,@ Cru=  
    { ]R{=|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M>k7 '@G  
     bProcessed=TRUE; jW",'1h<n  
    } Ic&t_B*i}]  
   } ;h3*MR  
  } ig/716r|  
  else if((lParam&0xc000ffff)==1){ //有键按下 fhn0^Qc"+  
   switch(wParam) 7"JU)@ U]  
   { {UZli[W1  
    case VK_MENU: S8vmXlD  
     MaskBits|=ALTBIT; .^.UJo;4G  
     break; ^! ZjK-$A<  
    case VK_CONTROL: U w`LWG3T  
     MaskBits|=CTRLBIT; a\m10Ih:  
     break; IL:"]`f*  
    case VK_SHIFT: N<>dg  
     MaskBits|=SHIFTBIT; 6l vx  
     break; FvI`S>  
    default: //judge the key and send message pmW=l/6+V3  
     break; \ bT]?.si  
   } fZ g*@RR  
   for(int index=0;index<MAX_KEY;index++){ Em"X5>;4  
    if(hCallWnd[index]==NULL) /?XfVhA:A  
     continue; x(7K3(#|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b);}x1L.T  
    { xf]4!zE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (kuZS4Af  
     bProcessed=TRUE; -% f DfjP  
    } tl^[MLQa  
   } ( L6`_)  
  } %-'U9e KN  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .CpF0  
   for(int index=0;index<MAX_KEY;index++){ 7:j #1N[p  
    if(hCallWnd[index]==NULL) `( a^=e5  
     continue; U;q)01  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 'Lw\n O.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  zm.2L  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 86I*  
   } Hf-F-~E  
  } %ej"ZeM  
 } BmJ?VJ}Y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }I`|*6Up  
} 8say"Qz  
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  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: q%vUEQLBp  
N+V-V-PVk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,/ : )FV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t3XMQ']  
zLn#p]  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: nz',Zm},  
sq^"bLw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M#>GU<4"  
{ } R/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) W[m_IY  
 { dCK -"#T!  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 HY:@=%R  
  SaveBmp(); |#B"j1D,H  
  return FALSE; 7A|jnm  
 } N.`]D)57  
 …… //其它处理及默认处理 @&W?e?O ~G  
} C(P$,;6  
nJya1AH;  
Z7/dRc   
  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。 {LeEnh-  
 k WtUj  
  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。 \nyFN  
bcs!4  
  二、编程步骤 ~z}au"k  
!T{g& f  
  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"; Wd}mC<rv1  
=KZ4:d5  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; WI,=?~-   
?:nZv< x  
  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; Nw2 bn  
7. .vaq#  
  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; z>:7}=H0  
+;Gl>$  
  5、 添加代码,编译运行程序。 f)x}_dw%  
!q/lgpEi  
三、程序代码 `[\phv  
9F](%/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ]t3"0  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) d"UW38K{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ kU/=Du  
#if _MSC_VER > 1000 JY+[  
#pragma once wjJ1Psnx  
#endif // _MSC_VER > 1000 )^Pvm  
#ifndef __AFXWIN_H__ ~,68S^nP)H  
#error include 'stdafx.h' before including this file for PCH ~bTae =FP  
#endif _%vqBr*  
#include "resource.h" // main symbols gj,J3x4TK/  
class CHookApp : public CWinApp I JY5wP1"  
{ wPJRp]FA  
 public: _vV&4>  
  CHookApp(); ;-GzGDc~0  
  // Overrides '5/}MMT  
  // ClassWizard generated virtual function overrides \_AEuz3 F  
  //{{AFX_VIRTUAL(CHookApp) s@LNQ|'kO  
 public: -==qMrKP  
  virtual BOOL InitInstance(); (iOCzZ6S  
  virtual int ExitInstance(); -Q PWi2:k  
  //}}AFX_VIRTUAL o`mIi  
  //{{AFX_MSG(CHookApp) cC^C7AAq^  
  // NOTE - the ClassWizard will add and remove member functions here. ;kW}'&Ug  
  // DO NOT EDIT what you see in these blocks of generated code ! F ssEs!#  
  //}}AFX_MSG #pQ"+X  
  DECLARE_MESSAGE_MAP() #6s C&w3  
}; *P R_Y=v%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); .l=*R7~EU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z/= %J3f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); LDEW00zL  
BOOL InitHotkey(); `uZv9I"  
BOOL UnInit(); Rgfhs[Z  
#endif }K80G~O2<  
^Lmc%y  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. C'czXZtn  
#include "stdafx.h" nQ17E{^pR  
#include "hook.h" <yI,cM<c  
#include <windowsx.h> !LIfeL.4h  
#ifdef _DEBUG T#G<?oF  
#define new DEBUG_NEW - (_e=3$  
#undef THIS_FILE M:Y*Tb6w  
static char THIS_FILE[] = __FILE__; )YMlF zYr  
#endif !x$ :8R  
#define MAX_KEY 100 JkDPuTXD  
#define CTRLBIT 0x04 #;LMtDaL  
#define ALTBIT 0x02 L\m!8o4  
#define SHIFTBIT 0x01 <cv2-?L{  
#pragma data_seg("shareddata") 'gZbNg=&[  
HHOOK hHook =NULL; H<Kkj  
UINT nHookCount =0; #} ~p^ 0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ).}k6v[4)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |1+(Ny.%k  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey afF+*\xXN  
static int KeyCount =0; I\rZk9F  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6{+_T  
#pragma data_seg() 3> \fP#oQ  
HINSTANCE hins; c@9Z&2)  
void VerifyWindow(); xw+<p  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) i=1 }lk q  
//{{AFX_MSG_MAP(CHookApp) <L/M`(:=k  
// NOTE - the ClassWizard will add and remove mapping macros here. Q5y q"/=[a  
// DO NOT EDIT what you see in these blocks of generated code! ~+<xFi  
//}}AFX_MSG_MAP dT]L-uRZgy  
END_MESSAGE_MAP() PPCTc|G  
&7($kj  
CHookApp::CHookApp() 7.$]f71z  
{ P#[IUXtT  
 // TODO: add construction code here, 'G l;Ir^  
 // Place all significant initialization in InitInstance s`#ntset0  
} 4ypRyO  
E#<7\ p>  
CHookApp theApp; *9dV/TT~f[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }$|%/Y  
{ c>S"`r  
 BOOL bProcessed=FALSE; K}PvrcO1  
 if(HC_ACTION==nCode) :/@k5#DY  
 { d<^_w!4X}  
  if((lParam&0xc0000000)==0xc0000000){// Key up V;iL[  
   switch(wParam) gb=80s0  
   { { r6]MS#l1  
    case VK_MENU: 3`&VRF8  
     MaskBits&=~ALTBIT; W>Mse[6`c  
     break; WYwzo V-  
    case VK_CONTROL: 7.Ml9{M/i  
     MaskBits&=~CTRLBIT; U_ x0KIm  
     break; S9G8aea/  
    case VK_SHIFT: v#<\:|XAg  
     MaskBits&=~SHIFTBIT; E\R raPkQT  
     break; =MTj4VXh"  
    default: //judge the key and send message <#xrrRhm}  
     break; R=\v3m  
   } ]`zjRRd  
   for(int index=0;index<MAX_KEY;index++){ b A)b`1lI  
    if(hCallWnd[index]==NULL) +"YTCzv;t  
     continue; 8?e   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |`w$|pm=  
    { 09R,'QJ|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =cdh'"XN  
     bProcessed=TRUE; %<aImR]  
    } x1N me%%&  
   } v[R_S  
  } $Hp.{jw  
  else if((lParam&0xc000ffff)==1){ //Key down 2;~KL-h0TK  
   switch(wParam) k(zs>kiP  
   { 968Ac}OA  
    case VK_MENU: 4)c+t"h  
     MaskBits|=ALTBIT; IIq"e~"Vs  
     break; ')C|`(hs   
    case VK_CONTROL: ,3:QB_  
     MaskBits|=CTRLBIT; cJP'ShnCh  
     break; `aO.=:O_  
    case VK_SHIFT: >65 TkAp  
     MaskBits|=SHIFTBIT; X$BXT  
     break; `Uz s+k-]  
    default: //judge the key and send message nHSTeF I?  
     break; uDILjOT  
   } T|;^.TZ  
   for(int index=0;index<MAX_KEY;index++) McEmd.S<n  
   { }l.KpdRT2  
    if(hCallWnd[index]==NULL) LkaG8#m1R  
     continue; M$,Jg5Dc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )*!1bgXQ  
    {  Nm jzDN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;xSRwSNDi(  
     bProcessed=TRUE; >4Iv[ D1  
    } j: <t  
   } q^u1z|'Z  
  } Lb!r(o>8Cb  
  if(!bProcessed){ dO+kPC  
   for(int index=0;index<MAX_KEY;index++){ hgj CXl  
    if(hCallWnd[index]==NULL) HKpD 2M  
     continue; PdR >;$1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Qqp)@uM^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); PT mf  
   } 6yN" l Q7  
  } %h0D)6 j  
 } Am#m>^!qb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); BpH|/7  
} e:qo_eSC^-  
'#H&:Htm;L  
BOOL InitHotkey() {b(rm,%  
{ ?LM:RADCm  
 if(hHook!=NULL){ h>dxBN  
  nHookCount++; ll_}& a0G  
  return TRUE; fb /qoZ  
 } aJI>FTdK  
 else l x7Kw%  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); h:f;mn?x  
  if(hHook!=NULL) 3KtAK9PT  
   nHookCount++; pNuqT*  
  return (hHook!=NULL); b<\$d4Qy  
} {&uT3*V1  
BOOL UnInit() 9 >%+bA(  
{ \ZqK\=  
 if(nHookCount>1){ w .tW=z5  
  nHookCount--; > 9o{(j  
  return TRUE; j?( c}!}  
 }  ?J<T  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :H{Bb{B%  
 if(unhooked==TRUE){ i9KTX%s5^  
  nHookCount=0; Ga.0Io&}C  
  hHook=NULL; <p09oZ{6  
 } [ qiOd!  
 return unhooked; INOH{`}Ew  
} N9pwWg&<+  
&1=g A.ZR  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t{~@I  
{ Hv3W{|  
 BOOL bAdded=FALSE; (e(Rr 4  
 for(int index=0;index<MAX_KEY;index++){ )R~a;?T_c0  
  if(hCallWnd[index]==0){ 2@fa rx:  
   hCallWnd[index]=hWnd; +1x)z~q=  
   HotKey[index]=cKey; zFOL(s.h|0  
   HotKeyMask[index]=cMask; jSB'>m]  
   bAdded=TRUE; 1ADv?+j)A/  
   KeyCount++; ^L ]B5,} -  
   break; N^lAG"Jao[  
  } wajZqC2yg  
 } 4x(F&0  
 return bAdded; bhn5Lz$z  
} o,J^ e_  
{(%~i37  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !\ZcOk2  
{ ( :iPm<  
 BOOL bRemoved=FALSE; J=@xAVBc  
 for(int index=0;index<MAX_KEY;index++){ 8|6~o.B.G  
  if(hCallWnd[index]==hWnd){ r( M[8@Nz  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ rfX=*mjt  
    hCallWnd[index]=NULL; e^=NL>V6p  
    HotKey[index]=0; g*F~8+]Y  
    HotKeyMask[index]=0; Y!M~#oqio  
    bRemoved=TRUE; Mo_$b8i  
    KeyCount--; q4+Yv2e <r  
    break; u7[pLtOwN  
   } ac|/Y$\w  
  } .wD>Gs{sH[  
 } ^Wm*-4  
 return bRemoved; N2T&,&, t  
} YIO.yN"0  
AxEc^Cof  
void VerifyWindow() rEmwKZF'  
{ Si]X rub  
 for(int i=0;i<MAX_KEY;i++){ gn^!"MN+g  
  if(hCallWnd!=NULL){ `4skwvS=  
   if(!IsWindow(hCallWnd)){ p=vV4C:  
    hCallWnd=NULL; 'aZAS Pn[  
    HotKey=0; S_$nCyaH2  
    HotKeyMask=0; eKyqU9  
    KeyCount--; SetX#e?q~  
   } p.5e: i^LJ  
  } nn'Af,ko/  
 } ~{$L9;x  
} .+HcAx{/2  
a>w~FUm*  
BOOL CHookApp::InitInstance() I )5<DZB9  
{ 6P^hN%0  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~pRs-  
 hins=AfxGetInstanceHandle(); <cj}:H *  
 InitHotkey(); B 2Z0  
 return CWinApp::InitInstance(); qEZ!2R^`G  
} 1LX)4TCC  
~XKZXGw  
int CHookApp::ExitInstance() EWO /u.z  
{ @%:E  }  
 VerifyWindow(); h"r!q[MN o  
 UnInit(); @<a|  
 return CWinApp::ExitInstance(); M|H 2kvl  
}  pr/'J!{^  
K'V 2FTJI  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file cl_T F[n?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) a MsJO*;>  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3Soy3Xp  
#if _MSC_VER > 1000 y] y9'5_  
#pragma once Hr&Ere8.4p  
#endif // _MSC_VER > 1000 E?_ zZ2  
Wt:~S/l  
class CCaptureDlg : public CDialog +<{m45  
{ ] );NnsG  
 // Construction ^o bC4(  
 public: ; [FLT:$  
  BOOL bTray; 03Ukw/D&  
  BOOL bRegistered; h\FwgkJP  
  BOOL RegisterHotkey(); 8O9Gs  
  UCHAR cKey; J)Ol"LXV  
  UCHAR cMask; >uHb ^  
  void DeleteIcon(); {!r#f(?uT  
  void AddIcon(); _ ~[M+IO   
  UINT nCount; 1fRP1  
  void SaveBmp(); )(]Envb?A0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor `,P >mp)uU  
  // Dialog Data N8QH*FX/F1  
  //{{AFX_DATA(CCaptureDlg) TaWaHf  
  enum { IDD = IDD_CAPTURE_DIALOG }; -x5F;d}  
  CComboBox m_Key; |Qr:!MA  
  BOOL m_bControl; }jiK3?e  
  BOOL m_bAlt; 6bUl > 4  
  BOOL m_bShift; bS%C?8  
  CString m_Path; tpGCrn2w>  
  CString m_Number; K[]K53Nk  
  //}}AFX_DATA v^TkDf(Oz  
  // ClassWizard generated virtual function overrides e[8UH=`|  
  //{{AFX_VIRTUAL(CCaptureDlg) 1yS&~ y?a  
 public: QAUykS8  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -yl;3K]l  
 protected: }uiPvO+&p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support a ea0+,;  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); mr qaM2,(I  
  //}}AFX_VIRTUAL g>T  
  // Implementation ai9  
 protected: s [T{c.F  
  HICON m_hIcon; /B[}I}X  
  // Generated message map functions U!Mf]3  
  //{{AFX_MSG(CCaptureDlg) `S$sQ&  
  virtual BOOL OnInitDialog(); t\%%d)d9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); * :S~C  
  afx_msg void OnPaint(); `2e_ L  
  afx_msg HCURSOR OnQueryDragIcon(); -N4z-ozhC  
  virtual void OnCancel(); GXYj+ qJ  
  afx_msg void OnAbout(); _r5wF(Y?7  
  afx_msg void OnBrowse(); 7>mhK7l  
  afx_msg void OnChange(); Wc\+x1:8  
 //}}AFX_MSG ZB0+GG\  
 DECLARE_MESSAGE_MAP() Q.E_:=*H  
}; LihdZ )  
#endif E-F5y  
bvp)r[8h  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =x#&\ui  
#include "stdafx.h" Y/D -V  
#include "Capture.h" aaT5u14%  
#include "CaptureDlg.h" ~ k<SbFp  
#include <windowsx.h> 'kQ~  
#pragma comment(lib,"hook.lib") .pW o>`"  
#ifdef _DEBUG )# PtV~64  
#define new DEBUG_NEW (!-;T  
#undef THIS_FILE ~j]dct7  
static char THIS_FILE[] = __FILE__; y@aKNWy}$  
#endif \HD-vINV;  
#define IDM_SHELL WM_USER+1 $P;UoqG<&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b!,ja?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8t=3  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^vW$XRnt  
class CAboutDlg : public CDialog M}KZG'7  
{ @() {/cF  
 public: :*cHA  
  CAboutDlg(); 2qXo{C3  
  // Dialog Data Ck@M<(x  
  //{{AFX_DATA(CAboutDlg) Z/c_kf[  
  enum { IDD = IDD_ABOUTBOX }; #<]Iz'\`  
  //}}AFX_DATA FR["e1<0  
  // ClassWizard generated virtual function overrides ~b#OFnyG  
  //{{AFX_VIRTUAL(CAboutDlg) & +]x;K  
 protected: OGGSS&5t w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N3Z@cp  
  //}}AFX_VIRTUAL ]LVnt-q  
  // Implementation ]) =H  
 protected: >3!DOv   
  //{{AFX_MSG(CAboutDlg) y{92Lym  
  //}}AFX_MSG RAwk7F3qn  
  DECLARE_MESSAGE_MAP() Pa[?L:E  
}; \imp7}N  
2m_H*1 HJ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) "f<#.}8  
{ 0Nt%YP  
 //{{AFX_DATA_INIT(CAboutDlg) E[ 0Sst x  
 //}}AFX_DATA_INIT kU1 %f o  
} P8IRH#ED  
gW}}5Xq  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) qsTq*G  
{ ,# eO&  
 CDialog::DoDataExchange(pDX); F^xaz^=`u  
 //{{AFX_DATA_MAP(CAboutDlg) ) G|"jFP  
 //}}AFX_DATA_MAP ^Eu_NUFe  
} @ct#s:t  
}H; ]k-)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) j C9<hLt  
 //{{AFX_MSG_MAP(CAboutDlg) %_)b>C18 y  
 // No message handlers 4rm87/u*0  
 //}}AFX_MSG_MAP 9>IsqYc  
END_MESSAGE_MAP() w0aHEvH/  
m EFWo  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) N" ;^S  
: CDialog(CCaptureDlg::IDD, pParent) 4L!e=>as"1  
{ Rd0?zEKV  
 //{{AFX_DATA_INIT(CCaptureDlg) "(N-h\7Ex9  
  m_bControl = FALSE; =^by0E2  
  m_bAlt = FALSE; N4s$.`  
  m_bShift = FALSE; @YsL*zw  
  m_Path = _T("c:\\"); Q6xgLx[  
  m_Number = _T("0 picture captured."); Etdd\^  
  nCount=0; 9'l.TcVm`,  
  bRegistered=FALSE; F\:{}782u  
  bTray=FALSE; ypxC1E  
 //}}AFX_DATA_INIT 4@gl4&<h  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 J09ZK8 hK  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); S~}$Ly@  
} 6B /Jp  
uz8nRS s  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  eMztjN  
{ "1AjCHZ  
 CDialog::DoDataExchange(pDX); ?fm2qrV@fp  
 //{{AFX_DATA_MAP(CCaptureDlg) ayHn_  
  DDX_Control(pDX, IDC_KEY, m_Key); /oBK&r[(  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); V.+DP  
  DDX_Check(pDX, IDC_ALT, m_bAlt); gZ=) qT]Pj  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <x^IwS  
  DDX_Text(pDX, IDC_PATH, m_Path); YK7gd|LR]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); g\E ._ab<  
 //}}AFX_DATA_MAP =xl7vHn7  
} )_WH#-}  
N IO;  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9.^-us1  
//{{AFX_MSG_MAP(CCaptureDlg) Z5 w`-#  
 ON_WM_SYSCOMMAND() zp}yiE!bl  
 ON_WM_PAINT() 4{c`g$j>  
 ON_WM_QUERYDRAGICON() M,I68  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) F@oT7NB/n  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) VNr!|bp5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4c~*hMr y  
//}}AFX_MSG_MAP 1V#B]x:  
END_MESSAGE_MAP() rAtai}Lx  
w}fqs/)w  
BOOL CCaptureDlg::OnInitDialog() "~B~{ _<j  
{ ^Jc$BMaVg  
 CDialog::OnInitDialog(); &?&'"c{;m  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); MA l{66  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3ZLr"O1l)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); DX7Ou%P,mg  
 if (pSysMenu != NULL) 8s\8`2=  
 { x A@|I#  
  CString strAboutMenu; =lw4 H_  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 9_I[o.q   
  if (!strAboutMenu.IsEmpty()) o<9yaQ;  
  { _gis+f/8h  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2&3eAJC  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); yOn H&Jj  
  } 5VCMpy  
 } bf&.rJ0  
 SetIcon(m_hIcon, TRUE); // Set big icon RI7qsm6RN  
 SetIcon(m_hIcon, FALSE); // Set small icon :5q^\xmmq  
 m_Key.SetCurSel(0); rerUM*0  
 RegisterHotkey(); 30wYc &H  
 CMenu* pMenu=GetSystemMenu(FALSE); o;HdW  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); h'z+8X_t  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); vY8WqG]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^' edE5  
 return TRUE; // return TRUE unless you set the focus to a control /TR"\xQF  
} qJe&jLZa  
i'[n`|c<  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) HPv&vdr3  
{ %`t]FV^#  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) *rujdQf  
 { $_%2D3-;D  
  CAboutDlg dlgAbout; 'US8"83  
  dlgAbout.DoModal(); E1mI Xd;.  
 } BZnp #}f  
 else N> uZt2  
 { b7F3]W<`&  
  CDialog::OnSysCommand(nID, lParam); z/Mhu{ttL  
 } 9P,A t8V(  
} oRtY?6^$  
f z/?=  
void CCaptureDlg::OnPaint() g~i''lng  
{ 8 RzF].)  
 if (IsIconic()) k}+MvGq  
 { HZ[68T[8b  
  CPaintDC dc(this); // device context for painting %Hh &u .  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); < |]i  
  // Center icon in client rectangle Rz])wBv e  
  int cxIcon = GetSystemMetrics(SM_CXICON); S|z(  
  int cyIcon = GetSystemMetrics(SM_CYICON); x _YV{  
  CRect rect; 9/8@  
  GetClientRect(&rect); [5}cU{M  
  int x = (rect.Width() - cxIcon + 1) / 2; wd2P/y42;;  
  int y = (rect.Height() - cyIcon + 1) / 2; W? 6  
  // Draw the icon "OlI-^y  
  dc.DrawIcon(x, y, m_hIcon); ys~p(  
 } NUxAv= xl  
 else .wt>.mUH  
 { XQ+-+CD  
  CDialog::OnPaint(); 9>} (]T  
 } ?$`1%Y9  
} KqG$zC^N  
` i^`Q  
HCURSOR CCaptureDlg::OnQueryDragIcon() ?()E5 4y  
{ ]ZU:%Qhu  
 return (HCURSOR) m_hIcon; KY(l<pm  
} [W8iM7D  
|n-a\  
void CCaptureDlg::OnCancel() 7!` C TE  
{ M25z<Y  
 if(bTray) F(J!dG5#  
  DeleteIcon(); %'D:bi5  
  CDialog::OnCancel(); 4p/V6kr&r  
} *6\`A!C  
3ec==.  
void CCaptureDlg::OnAbout() Nsy9 h}+A  
{ iu:p &h  
 CAboutDlg dlg; 2kmna/Qa6  
 dlg.DoModal(); '8kL1  
} aS1P]&  
>x_:=%Wr+  
void CCaptureDlg::OnBrowse()  +lf@O&w  
{ wTgx(LtH  
 CString str; Vms7 Jay  
 BROWSEINFO bi; /i]=ndAk  
 char name[MAX_PATH]; F6neG~Y  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); {H7$uiq3:B  
 bi.hwndOwner=GetSafeHwnd(); KH6n3\=  
 bi.pszDisplayName=name; BR0p0%  
 bi.lpszTitle="Select folder"; zWR*g/i  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; CH R?i1e  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); O<H@:W #k  
 if(idl==NULL) w1!\L_::Y  
  return; q5K/+N^2?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )u v$tnP*  
 str.ReleaseBuffer(); (w7cdqe  
 m_Path=str; '=G<)z@k  
 if(str.GetAt(str.GetLength()-1)!='\\') ~)\1g0  
  m_Path+="\\"; -fZShOBY`  
 UpdateData(FALSE); OHa{!SaL  
} kosJ]q'U  
Q/9vDv  
void CCaptureDlg::SaveBmp() R;,u >P "  
{ \5L4*  
 CDC dc; %;\2QI`R  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); `X]2iz  
 CBitmap bm; J|64b  
 int Width=GetSystemMetrics(SM_CXSCREEN); _tauhwu  
 int Height=GetSystemMetrics(SM_CYSCREEN); (L6]uNOG  
 bm.CreateCompatibleBitmap(&dc,Width,Height); /Z9`uK  
 CDC tdc; f+W[]KK*PW  
 tdc.CreateCompatibleDC(&dc); PTV`=vtj  
 CBitmap*pOld=tdc.SelectObject(&bm); [2fiHE  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); x@bl]Z(ne/  
 tdc.SelectObject(pOld); V~^6 TS(  
 BITMAP btm; DuC u6j  
 bm.GetBitmap(&btm); @OL3&R  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; MsiC!j.-  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Zo638*32  
 BITMAPINFOHEADER bih; |(8Hk@\CT>  
 bih.biBitCount=btm.bmBitsPixel; )bN3-_  
 bih.biClrImportant=0; cd%g]T)#1  
 bih.biClrUsed=0; 4>tYMyLt0  
 bih.biCompression=0; $!3t$-TSD  
 bih.biHeight=btm.bmHeight; ,9j:h)ks?  
 bih.biPlanes=1; a*wJcJTpV"  
 bih.biSize=sizeof(BITMAPINFOHEADER); -"^WDs  
 bih.biSizeImage=size; OQb9ijLeK  
 bih.biWidth=btm.bmWidth; Chi<)P$^  
 bih.biXPelsPerMeter=0; 1Qe!  
 bih.biYPelsPerMeter=0; ~X(xa  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); c o%_~xO  
 static int filecount=0; L" ^366M!  
 CString name; 0 Ln5e.&  
 name.Format("pict%04d.bmp",filecount++); 1R~WY'Ed  
 name=m_Path+name; 25@j2K(  
 BITMAPFILEHEADER bfh; L}S4Zz18  
 bfh.bfReserved1=bfh.bfReserved2=0; M{kh=b)V  
 bfh.bfType=((WORD)('M'<< 8)|'B');  eJ\j{-  
 bfh.bfSize=54+size; BNm va  
 bfh.bfOffBits=54; Ol5xyj  
 CFile bf; }c#/1J7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9TN5|x  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ML"P"&~u6  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); wdDHRW0Y  
  bf.WriteHuge(lpData,size); JY8"TQ$x  
  bf.Close(); ^{+:w:g  
  nCount++; /Gv$1t^a  
 } Y/I6.K3  
 GlobalFreePtr(lpData); aZCT|M1  
 if(nCount==1) pC.T)k  
  m_Number.Format("%d picture captured.",nCount); : )*Ge3  
 else h9smviU7u  
  m_Number.Format("%d pictures captured.",nCount); RvZ-w$E&?  
  UpdateData(FALSE); T[=cKYp8\  
} Qi]Z)v{^  
cTx/Y&\9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) LsZ!':LN  
{ 3kQ8*S  
 if(pMsg -> message == WM_KEYDOWN) X35U!1Y\  
 { *K^O oS  
  if(pMsg -> wParam == VK_ESCAPE) f0bV]<_9  
   return TRUE; }? '9L:  
  if(pMsg -> wParam == VK_RETURN) 2/q=l?  
   return TRUE; ]<z(Rmn`Q  
 } ffd 3QQ  
 return CDialog::PreTranslateMessage(pMsg); ]c=1-Rl  
} 0BD((oNg  
"fJ|DE&@<i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &+iW:  
{ D)Rf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ To? bp4  
  SaveBmp(); a-2 {x2O  
  return FALSE; zW`koRH@  
} :R\v# )C  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ eyjUNHeh#  
 CMenu pop; :Aiu!}\  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); p+D 6Z'B  
 CMenu*pMenu=pop.GetSubMenu(0); t? J a q  
 pMenu->SetDefaultItem(ID_EXITICON); %Z0S"B 3  
 CPoint pt; "(VcYQ+  
 GetCursorPos(&pt); =}lA|S  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); eE_XwLE  
 if(id==ID_EXITICON) 7f,W zvV  
  DeleteIcon(); C2i..iD  
 else if(id==ID_EXIT) ~y^lNgujO  
  OnCancel(); s""8V_,;  
 return FALSE; R*C+Yk)Tkt  
} Dx)XC?'xO  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); / {~h?P}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) lc#zS_  
 AddIcon();  P;/wb /  
 return res; %-|q3 ^s  
} b u9&sQ;  
wcT6d?*5  
void CCaptureDlg::AddIcon() 0J</`/gH  
{ B;_3IHMO  
 NOTIFYICONDATA data; $zi\ /Yw  
 data.cbSize=sizeof(NOTIFYICONDATA); #;]F:TlR  
 CString tip; 0 d]G  
 tip.LoadString(IDS_ICONTIP); ^ w1R"qE"m  
 data.hIcon=GetIcon(0); 2` qXD fD`  
 data.hWnd=GetSafeHwnd(); [i#Gqx>'w  
 strcpy(data.szTip,tip); }"k(kH  
 data.uCallbackMessage=IDM_SHELL; M oHvXp;X  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |%;txD  
 data.uID=98; X6 cb#s0|  
 Shell_NotifyIcon(NIM_ADD,&data); H;&t"Ql.  
 ShowWindow(SW_HIDE); .w)t<7 y  
 bTray=TRUE; A@'W $p?5r  
} E=trJge  
6LQO>k  
void CCaptureDlg::DeleteIcon() 1`\kXaG  
{ Mp=+*I[  
 NOTIFYICONDATA data; RtL'fd  
 data.cbSize=sizeof(NOTIFYICONDATA); /=}vP ey  
 data.hWnd=GetSafeHwnd(); ^4NH.q{  
 data.uID=98; qNL~m'  
 Shell_NotifyIcon(NIM_DELETE,&data); j-|0&X1C  
 ShowWindow(SW_SHOW); zSCPp6  
 SetForegroundWindow(); "PtH F`mo  
 ShowWindow(SW_SHOWNORMAL); *^_!W'T{j  
 bTray=FALSE; |_m;@.44?U  
} Ka{Zoi]  
5Oq;V: 7  
void CCaptureDlg::OnChange() J< M;vB)  
{ tn1aH +  
 RegisterHotkey(); WQL`;uIX  
} h]P$L>  
"FS.&&1(  
BOOL CCaptureDlg::RegisterHotkey() L9)&9 /f  
{ |pY0IqO  
 UpdateData(); a| cD{d  
 UCHAR mask=0; rd{( E  
 UCHAR key=0; SbivW5|61  
 if(m_bControl) wv-8\)oA  
  mask|=4; DBDfB b  
 if(m_bAlt) jp`N%O]6  
  mask|=2; w[-Bsf  
 if(m_bShift) ;Vt u8f  
  mask|=1; q(W@=-uDK  
  key=Key_Table[m_Key.GetCurSel()]; +Z*%,m=N(  
 if(bRegistered){ 6'zy"UkH  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); rOT8!"  
  bRegistered=FALSE; %}:J 9vra  
 } hNy S  
 cMask=mask; -AQX-[B  
 cKey=key; 0f1#T gX  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rkl7p?  
 return bRegistered; UtrbkuT  
} pnU g:R@  
hg @Jpg  
  四、小结 h@d m:=ul  
= xk@Q7$  
  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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