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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: 9 wZ?")2  
  +l^tT&s;f  
  一、实现方法 jB8Q% {%  
ele@xl  
  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: <Xl#}6II  
%ggf|\ -e  
#pragma data_seg("shareddata") Asv]2> x  
HHOOK hHook =NULL; //钩子句柄 XHekz6_  
UINT nHookCount =0; //挂接的程序数目 s EFQ8S  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 )i}j\";>L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 OL>)SJj5  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Qn7T{ BW  
static int KeyCount =0; '{cSWa| #  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 a;t}'GQGk  
#pragma data_seg() ._^}M<o L  
h*%FZ}}`q  
  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。  D3cJIVM  
o>_})WM1[  
  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: ZA+dtEE=f9  
uG^CyM>R`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR z3y{0<3  
cKey,UCHAR cMask) (B>/LsTu  
{ 'g!T${  
 BOOL bAdded=FALSE; r5DR F4,7  
 for(int index=0;index<MAX_KEY;index++){ V_:`K$  
  if(hCallWnd[index]==0){ S7)qq  
   hCallWnd[index]=hWnd; U3X5tED  
   HotKey[index]=cKey; \rF S^#  
   HotKeyMask[index]=cMask; W w,\s5Uw  
   bAdded=TRUE; B~w$j/sWU  
   KeyCount++; ,U3  
   break; is4}s,]$6  
  } pASX-rb  
 } 9a=Ll]=\  
 return bAdded; &cL1 EQ(  
} z~#;[bER  
//删除热键 \P*_zd@%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l)9IgJ|<b  
{ E +_n@t"  
 BOOL bRemoved=FALSE; <%m YsaM  
 for(int index=0;index<MAX_KEY;index++){ H:@hCO[a  
  if(hCallWnd[index]==hWnd){ zbmC? 2$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HEBeJ2w  
    hCallWnd[index]=NULL; q7X#LYk  
    HotKey[index]=0; @khFk.LBD  
    HotKeyMask[index]=0; @ j^R+F  
    bRemoved=TRUE; Z1eT> 6|]r  
    KeyCount--; rZKfb}ANQ  
    break; -g@!\{  
   } <{isWEW9]3  
  } jc&k-d>=G  
 } kJJT`Ba&/  
 return bRemoved; au{) 5W4~  
} $Z:O&sD{  
2)n`Bd  
$D1ha CL  
  DLL中的钩子函数如下: itg_+%^R  
qD{1X25O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5tYo! f  
{ +nE>)ZH  
 BOOL bProcessed=FALSE; _#u\ar)  
 if(HC_ACTION==nCode) f' ?/P~[  
 { A`n>9|R  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 j6GIB_  
   switch(wParam) a_RY Yj  
   {  |}z)>E  
    case VK_MENU: )A\ ZS<@Z7  
     MaskBits&=~ALTBIT; *4}_2"[  
     break; uzBQK  
    case VK_CONTROL: U?UU] >Q  
     MaskBits&=~CTRLBIT; oX|T&"&  
     break; e9o\qEm   
    case VK_SHIFT: <y@v v  
     MaskBits&=~SHIFTBIT; 1Cw]~jh  
     break; Y;/@[AwF  
    default: //judge the key and send message aUaeK(x:H  
     break; 6kYluV+j  
   } X`.##S KC  
   for(int index=0;index<MAX_KEY;index++){ {y9G "  
    if(hCallWnd[index]==NULL) i "h\*B=  
     continue; w:t~M[kTW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Sc7 Ftb%  
    { 4j={ 9e<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V4[-:k  
     bProcessed=TRUE; 'z ?Hv  
    } x4WCAqi/2  
   } z`zz8hK.  
  } geme_  
  else if((lParam&0xc000ffff)==1){ //有键按下 lU{)%4e`  
   switch(wParam) n9B5D:.G  
   { +V4)><  
    case VK_MENU: #*o0n>O  
     MaskBits|=ALTBIT; QTy=VLk43  
     break; rYb5#aT[  
    case VK_CONTROL: |J-X3`^\H  
     MaskBits|=CTRLBIT; WC#6(H5t$  
     break; V&*IZt&  
    case VK_SHIFT: }u_D{bz  
     MaskBits|=SHIFTBIT; `HX:U3/  
     break; 2_q/<8t  
    default: //judge the key and send message %e~xO x  
     break; W/qXQORv  
   } L7$f01*  
   for(int index=0;index<MAX_KEY;index++){ KN}#8.'>3  
    if(hCallWnd[index]==NULL) E_ wVAz3  
     continue; ` ,\b_SFg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ("8Hku?  
    { !"N,w9MbD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /6 ')B !&  
     bProcessed=TRUE; ,"EaZ/Bl/  
    } ~/L:$  
   } (!* l+}  
  } NM{)liP ;8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _4by3?<c  
   for(int index=0;index<MAX_KEY;index++){ J :O!4gI  
    if(hCallWnd[index]==NULL) _%e8GWf  
     continue; Xdn&%5rI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) B4y_{V  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ZC?~RXL(  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 t<45[~[  
   } (Ceruo S  
  } &<t%u[3  
 } }j/\OY _&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;/Hr ZhOE  
} "*bLFORkq'  
zG9FO/@av  
  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: cXq9k!I%  
74([~Qs _M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >V"{]v  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E=I'$*C \D  
}>{R<[I!G  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: w){B$X  
hIV9.{J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) eKiDc=@  
{ 3~`P8 9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) .RroO_H   
 { Cj= R\@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 <f>77vh0  
  SaveBmp(); In?rQiD9  
  return FALSE; ^T&{ORWz  
 } m6i ,xn  
 …… //其它处理及默认处理 Qsbyy>o)  
} DGHSyB^+1  
c}@E@Y`@w  
I'5[8  
  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。 sX"L\v  
Fl)nmwO c  
  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。 %e:+@%]  
F@<cp ?dR  
  二、编程步骤 >g$iO`2  
E-WpsNJ)X  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; lf=G  
EB3/o7)L  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; PhAfEsD  
jRsl/dmy  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; |b\a)1Po:  
z};|.N}  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; >#h,q|B  
Yi9Y`~J  
  5、 添加代码,编译运行程序。 ef'kG"1  
/` M#  
三、程序代码 v~OMm \  
|sGJum&=  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ,a>Dv@$Y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) pLu5x<  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ iQO4IT   
#if _MSC_VER > 1000 AWcbbj6Nd  
#pragma once #x.v)S  
#endif // _MSC_VER > 1000 6.]~7n  
#ifndef __AFXWIN_H__ 'd N1~Pa  
#error include 'stdafx.h' before including this file for PCH ^li3*#eT  
#endif G&h@  
#include "resource.h" // main symbols a<-aE4wdm  
class CHookApp : public CWinApp _n:RA)4*  
{ {J"]tx9 ]  
 public: 2D:/.9= 8v  
  CHookApp(); 7)U ik}0  
  // Overrides 3FvVM0l"  
  // ClassWizard generated virtual function overrides GbLHzw  
  //{{AFX_VIRTUAL(CHookApp) ^x0N] /  
 public: E]Mx<7;\.  
  virtual BOOL InitInstance(); ICz:>4M-dn  
  virtual int ExitInstance(); "`;-5dg  
  //}}AFX_VIRTUAL LGc8w>qE  
  //{{AFX_MSG(CHookApp) l$5nv5r  
  // NOTE - the ClassWizard will add and remove member functions here. (&.T  
  // DO NOT EDIT what you see in these blocks of generated code ! 1L`V{\_0s  
  //}}AFX_MSG ,hf W2}  
  DECLARE_MESSAGE_MAP() ViW2q"4=  
}; ]U#of O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); .-YE(}^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @KM?agtlbl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3D6&0xTq  
BOOL InitHotkey(); _p"u~j~%-  
BOOL UnInit(); t;+b*S6D  
#endif j3&q?1  
"$N$:B@U  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Q&0`(okb  
#include "stdafx.h" F=Xb_Gd`  
#include "hook.h" </kuJh\  
#include <windowsx.h> *ELU">!}G  
#ifdef _DEBUG  j=pg5T  
#define new DEBUG_NEW K Zg NL|  
#undef THIS_FILE O)W+rmToI  
static char THIS_FILE[] = __FILE__; (1cB Tf  
#endif Jt}`oFQ5l  
#define MAX_KEY 100 h1?xfdvGd  
#define CTRLBIT 0x04 H*G(`Zl}  
#define ALTBIT 0x02 }bRn&)e  
#define SHIFTBIT 0x01 &IXmy-w  
#pragma data_seg("shareddata") 7#wB  
HHOOK hHook =NULL; u3 Z]!l  
UINT nHookCount =0; [f:&aS+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey +\["HS7+'0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `}`Qqv  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey PK|qiu-O&*  
static int KeyCount =0; [ PN2^  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6&]Z'nW0k  
#pragma data_seg() eV%{XR?y  
HINSTANCE hins; auGK2i  
void VerifyWindow(); z#Qe$`4&  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) |(l]Xr&O  
//{{AFX_MSG_MAP(CHookApp) [*u\S  
// NOTE - the ClassWizard will add and remove mapping macros here. LL);Ym9d  
// DO NOT EDIT what you see in these blocks of generated code! khjdTq\\  
//}}AFX_MSG_MAP ]i075bO/  
END_MESSAGE_MAP() 6|lsG6uf  
|11vm#  
CHookApp::CHookApp() ^>%.l'1/(  
{ I~6(>Z{  
 // TODO: add construction code here, {Y/0BS2D  
 // Place all significant initialization in InitInstance  #*rJI3  
} #yIHr&'oX  
:Z/\U*6~  
CHookApp theApp; '0 ~?zP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) W\-`}{B_/  
{ 2ZV; GS#  
 BOOL bProcessed=FALSE; 2!LDrvPP  
 if(HC_ACTION==nCode) /$clk=  
 { :' 5J[]J  
  if((lParam&0xc0000000)==0xc0000000){// Key up J0vQqTaT  
   switch(wParam) P(yLRc  
   { EKO'S+~  
    case VK_MENU: ?f9M59(l  
     MaskBits&=~ALTBIT; Ge({sy>X  
     break; &0f/F:M  
    case VK_CONTROL: phG *It}  
     MaskBits&=~CTRLBIT; F3vywN1$,  
     break; vCej( ))  
    case VK_SHIFT: CAx$A[f<  
     MaskBits&=~SHIFTBIT; W%5))R$  
     break; s)E8}-v  
    default: //judge the key and send message _QHk&-Lp  
     break; [>>_%T\I  
   } x]`F#5j  
   for(int index=0;index<MAX_KEY;index++){ >&fD:y'&  
    if(hCallWnd[index]==NULL) @C^x&Sjm  
     continue; e}-fGtFx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F#yn'j8  
    { P c&dU1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,<!*@xy7v  
     bProcessed=TRUE; a e-tAA[1Y  
    } 5nBJj  
   } b00$3,L   
  } EdqB4-#7  
  else if((lParam&0xc000ffff)==1){ //Key down _t"[p_llo  
   switch(wParam) fe<7D\Sp@  
   { Y=|20Y\K  
    case VK_MENU: c2Z !Vtd  
     MaskBits|=ALTBIT; F,)+9/S&  
     break; [z\baL|  
    case VK_CONTROL: $DfK}CT  
     MaskBits|=CTRLBIT; 117lhx].'  
     break; wQhuU  
    case VK_SHIFT: HCrQ+r{g  
     MaskBits|=SHIFTBIT; |5`ecjb.  
     break; W$wX[  
    default: //judge the key and send message &b^_~hB:q  
     break; LEjq<t1&  
   } uWClT):  
   for(int index=0;index<MAX_KEY;index++) !4#qaH-Q  
   { &/Gn!J;1  
    if(hCallWnd[index]==NULL) )uAY_()/  
     continue; DazoY&AWE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X0+E!~X$zM  
    { Fab]'#1q4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bBc<p{  
     bProcessed=TRUE; 'hWA&Xx +  
    } ` ;mQ"lO  
   } ceJ#>Rj  
  } "9^b1UH<  
  if(!bProcessed){ \tvL<U"'  
   for(int index=0;index<MAX_KEY;index++){ s* u1n+Zq  
    if(hCallWnd[index]==NULL) Z JcX-Z!\  
     continue; j&/+/s9N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) lijT L-3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (Nz`w  
   } "CC"J(&a  
  } Nz3+yxv1  
 } [ *It' J^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 55ec23m  
} *-fd$l.  
a+J>  
BOOL InitHotkey() 0+1!-Wo  
{ +1yi{!j1  
 if(hHook!=NULL){ L?;UcCB  
  nHookCount++; ,<K+.7,)E  
  return TRUE; ZY7-.  
 } %E#Ubm!  
 else *7Y#G8 s  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "8uNa  
  if(hHook!=NULL) @i(9k  
   nHookCount++; 451.VI}MR  
  return (hHook!=NULL); {R63n  
} ny+r>>3Td  
BOOL UnInit() P 0+@,kM  
{ <]%6x[  
 if(nHookCount>1){ %U}6(~  
  nHookCount--;  h#}w18l  
  return TRUE; x ~)~v?>T  
 } 12L`Gi  
 BOOL unhooked = UnhookWindowsHookEx(hHook); qHgtd+ I  
 if(unhooked==TRUE){ 4qE4 i:b  
  nHookCount=0; kmTYRl )j  
  hHook=NULL; i)(G0/:  
 } 2DsP "q79k  
 return unhooked; ?5ZvvAi  
} gQSVPbzK  
aB (pdW4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uUx7>algF  
{ >G"fMOOkW  
 BOOL bAdded=FALSE; EpRn,[  
 for(int index=0;index<MAX_KEY;index++){ QPLWRZu@  
  if(hCallWnd[index]==0){ h]~FYY  
   hCallWnd[index]=hWnd; aqqo>O3 s  
   HotKey[index]=cKey; %X\A|V&  
   HotKeyMask[index]=cMask; Hicd -'  
   bAdded=TRUE; F-o?tU  
   KeyCount++; k kD#Bb  
   break; C[%&;\3S@  
  } x.t&NP^V)  
 } P}a$#a'!  
 return bAdded; q$yg^:]2  
} CDtL.a\  
i" u|119  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) i Pr(X  
{ VfJ{);   
 BOOL bRemoved=FALSE; A9SL|9Q  
 for(int index=0;index<MAX_KEY;index++){ n2-+.9cY  
  if(hCallWnd[index]==hWnd){ uUHWTyoO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3 SbZD   
    hCallWnd[index]=NULL; 2+)h!y]  
    HotKey[index]=0; t>%b[(a  
    HotKeyMask[index]=0; IFr"IOr'l  
    bRemoved=TRUE; mT@Gf>}/A  
    KeyCount--; 9&zR i  
    break; `EMGrw_  
   } \fC;b"j  
  } bG"FN/vg  
 } u=s,bt,"5  
 return bRemoved; a""9%./B  
} t1 9f%d  
e~)4v  
void VerifyWindow() >{~xO 6H  
{ WdS1v%  
 for(int i=0;i<MAX_KEY;i++){ wTR?8$  
  if(hCallWnd!=NULL){ jCtk3No  
   if(!IsWindow(hCallWnd)){ 2P`./1L  
    hCallWnd=NULL; BB3 a8  
    HotKey=0; Rvf{u8W  
    HotKeyMask=0; UJp'v_hN  
    KeyCount--; D?S|]]Y!q  
   } c 8  
  } &@|? %  
 } [3S17tTc3  
} yp=sL' E  
<W3p!  
BOOL CHookApp::InitInstance() 7z,  $  
{ OA9 P"*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 91&=UUkK?  
 hins=AfxGetInstanceHandle(); MTl @#M  
 InitHotkey(); ^)Y3V-@t  
 return CWinApp::InitInstance(); &Q"vXs6Gt  
} N GnE  
bvZD@F`2  
int CHookApp::ExitInstance() Zp_j\B  
{ RaTNA W)v>  
 VerifyWindow(); RWM~7^JA  
 UnInit(); yVn%Bz' [  
 return CWinApp::ExitInstance(); =z9,=rR4  
} 7|dm"%@  
j?$B@Zk  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file DH _~,tK9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) mM/#(Ghl  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _'Vo3b  
#if _MSC_VER > 1000 # Dgkl  
#pragma once uw8g%  
#endif // _MSC_VER > 1000 pcOi%D,o  
AriV4 +  
class CCaptureDlg : public CDialog Citumc)E  
{ IN1 n^f$:  
 // Construction #2Q%sE?  
 public: %j17QD8  
  BOOL bTray; |SMigSu r`  
  BOOL bRegistered; !U(S?:hvW  
  BOOL RegisterHotkey(); hV`?, ~K  
  UCHAR cKey; hF^JSCDz l  
  UCHAR cMask; >zJkG9a  
  void DeleteIcon(); yCkWuU9  
  void AddIcon(); B$JPE7h@[P  
  UINT nCount; 9dszn^]T  
  void SaveBmp(); mqJD+ K  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor r:0RvWif  
  // Dialog Data Dvz 6 E  
  //{{AFX_DATA(CCaptureDlg) J'=s25OWU  
  enum { IDD = IDD_CAPTURE_DIALOG }; n 78!]O  
  CComboBox m_Key; \?e2qu/ C  
  BOOL m_bControl; 3bC-B!{;g  
  BOOL m_bAlt; d@JavcR  
  BOOL m_bShift; j;j~R3B  
  CString m_Path; fWfhs}_  
  CString m_Number; k8}'@w  
  //}}AFX_DATA $`0^E#Nl  
  // ClassWizard generated virtual function overrides K]>4*)A:  
  //{{AFX_VIRTUAL(CCaptureDlg) u\xrC\Ka  
 public: G5 )"%G.  
  virtual BOOL PreTranslateMessage(MSG* pMsg); c??m9=OX1  
 protected: Wx;%W"a  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fIx|0,D&7L  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); h;} fdk  
  //}}AFX_VIRTUAL ZZ!6O/M  
  // Implementation 'i3-mZ/|8  
 protected: O@H D'  
  HICON m_hIcon; w\Q(wH'  
  // Generated message map functions l&] %APL  
  //{{AFX_MSG(CCaptureDlg) MB>4Y]rtU  
  virtual BOOL OnInitDialog(); Z *l&<q>#  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~]W @+\l  
  afx_msg void OnPaint(); 066\zAPdH  
  afx_msg HCURSOR OnQueryDragIcon(); d@Bd*iI<  
  virtual void OnCancel(); \Z%_dT}  
  afx_msg void OnAbout(); }Sh@.3*  
  afx_msg void OnBrowse(); }\N ~%?6D  
  afx_msg void OnChange(); xQ?$H?5B<  
 //}}AFX_MSG qIzv|Nte  
 DECLARE_MESSAGE_MAP() eK3d_bF+  
}; 4T)`%Oo<}  
#endif  UiK)m:NU  
8r,0Qic2K  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file OaN"6Ge#  
#include "stdafx.h" ^eRbp?H*T  
#include "Capture.h" [["eK9 }0  
#include "CaptureDlg.h" ]4*E:  
#include <windowsx.h> e *D,2>o  
#pragma comment(lib,"hook.lib") \Z~@/OVc  
#ifdef _DEBUG Pa|*Jcr  
#define new DEBUG_NEW >K%+h)%kI  
#undef THIS_FILE 4 l+z  
static char THIS_FILE[] = __FILE__; V%M@zd?u.  
#endif Iz#jR2:yn  
#define IDM_SHELL WM_USER+1 +]H!q W:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0H'G./8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !14v Ovj4{  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 11A;z[Zk  
class CAboutDlg : public CDialog pnv)D}"  
{ ESS1 L$y  
 public: +H? XqSC  
  CAboutDlg(); ##] `  
  // Dialog Data ?6MUyH]a  
  //{{AFX_DATA(CAboutDlg) 9I1`*0A  
  enum { IDD = IDD_ABOUTBOX }; j{ri]?p  
  //}}AFX_DATA RSjcOQ8&.w  
  // ClassWizard generated virtual function overrides 4>HQ2S{t  
  //{{AFX_VIRTUAL(CAboutDlg) !Xq5r8]  
 protected: AQ"rk9Z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support gd]k3XN$f  
  //}}AFX_VIRTUAL -gb@BIV#  
  // Implementation { ux'9SA  
 protected: v)zxQuH]^  
  //{{AFX_MSG(CAboutDlg) \/ Zo*/  
  //}}AFX_MSG ="g9>  
  DECLARE_MESSAGE_MAP() KC<K*UHPAH  
}; 2XjH1  
8)f/H&)>8  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) R&/"?&pfa  
{ `,c~M  
 //{{AFX_DATA_INIT(CAboutDlg) E.x<J.[Y  
 //}}AFX_DATA_INIT `P;3,@ e  
} AY9#{c>X  
IJZx$8&A  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1l}fX}5%I;  
{ d=HD! e  
 CDialog::DoDataExchange(pDX); niPqzi  
 //{{AFX_DATA_MAP(CAboutDlg) yyVE%e5nl  
 //}}AFX_DATA_MAP Z+FhI^  
} j#VR>0oC]\  
)b|xzj@  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) "t>H B6^  
 //{{AFX_MSG_MAP(CAboutDlg) d&DQ8Gm ^  
 // No message handlers  |L  <  
 //}}AFX_MSG_MAP EhOB+Mc1  
END_MESSAGE_MAP() }%,LV]rGEZ  
P[,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T<0V ^B7  
: CDialog(CCaptureDlg::IDD, pParent) kh"APxQ79  
{ ` P*PCiZos  
 //{{AFX_DATA_INIT(CCaptureDlg) v +?'/Q%  
  m_bControl = FALSE; GRgpy  
  m_bAlt = FALSE; )Y=ti~?M(  
  m_bShift = FALSE; }A<fCm7  
  m_Path = _T("c:\\"); ~y:?w(GD  
  m_Number = _T("0 picture captured."); drB$q [Ak9  
  nCount=0; (%]M a  
  bRegistered=FALSE; Q6PMRG}/o  
  bTray=FALSE; o~'UWU'#  
 //}}AFX_DATA_INIT ~2XiKY;W?  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9@ ^*\s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); X/S%0AwZ  
} mGUG  
n=h!V$X   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ^QTkre  
{ |f[:mO   
 CDialog::DoDataExchange(pDX); kl5Y{![/&f  
 //{{AFX_DATA_MAP(CCaptureDlg) RXhT{Ho(>  
  DDX_Control(pDX, IDC_KEY, m_Key); d]^\qeG^p  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); !$,e)89  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 4+N9Ylh  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [ldx_+xa:E  
  DDX_Text(pDX, IDC_PATH, m_Path); Ehtb`Ms  
  DDX_Text(pDX, IDC_NUMBER, m_Number); |OBZSk1jp  
 //}}AFX_DATA_MAP 'R n\CMTH  
} & c 81q2  
6[]O3Aa  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %wmbFj}  
//{{AFX_MSG_MAP(CCaptureDlg) o5w =  
 ON_WM_SYSCOMMAND() \r\wqz7  
 ON_WM_PAINT() u< 5{H='6  
 ON_WM_QUERYDRAGICON() ?Aky!43  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ue!wo-|#G  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q~)A fa{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 'u%SI]*;>  
//}}AFX_MSG_MAP 2TX.%%Ze  
END_MESSAGE_MAP() $&0\BvS  
Z+S1e~~  
BOOL CCaptureDlg::OnInitDialog() R lmeZy4.  
{ ,k6V?{ZA  
 CDialog::OnInitDialog(); #Gu(h(Z s  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); vsbD>`I  
 ASSERT(IDM_ABOUTBOX < 0xF000); -+ Mh( 'K  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;#dzw!+Y  
 if (pSysMenu != NULL) lT F#efcW  
 { XCE<].w  
  CString strAboutMenu; o:RO(oA0?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ]Cc8[ZC  
  if (!strAboutMenu.IsEmpty()) !4fT<V (  
  { Y ^}c+)t  
   pSysMenu->AppendMenu(MF_SEPARATOR); A}0u-W  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); P<R'S  
  } PWN$x`h g[  
 } 7V;wCm#b  
 SetIcon(m_hIcon, TRUE); // Set big icon >L88`  
 SetIcon(m_hIcon, FALSE); // Set small icon C,dRdEB>  
 m_Key.SetCurSel(0); @t,Y< )U  
 RegisterHotkey(); ?~rz'Pu~  
 CMenu* pMenu=GetSystemMenu(FALSE); Ccy0!re  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); fzjZiBK@  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [hKt4]R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Znh) m  
 return TRUE; // return TRUE unless you set the focus to a control 0"xD>ue&  
} _!E/ em  
d /`d:g  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :@sjOY  
{ TM`6:5ONv  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) w?A6S-z  
 { p!p:LSk"/b  
  CAboutDlg dlgAbout; tD3v`Ke  
  dlgAbout.DoModal(); [O^mG 9  
 } Q~$hx{foN  
 else Gq;!g(  
 { 4*_.m9{  
  CDialog::OnSysCommand(nID, lParam); $or8z2d1  
 } 9{n?Jy  
} qM0Df0$?x  
A&qZ:&(OM  
void CCaptureDlg::OnPaint() !wEz= i  
{ q `^5<  
 if (IsIconic()) 6^hCW`jG  
 { ](sT,'  
  CPaintDC dc(this); // device context for painting fdzaM&  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); '&Tq/;Ml  
  // Center icon in client rectangle Q`[J3-Q*{  
  int cxIcon = GetSystemMetrics(SM_CXICON); Iq: G9M  
  int cyIcon = GetSystemMetrics(SM_CYICON); H!uq5` j0K  
  CRect rect; $}Ky6sBnvO  
  GetClientRect(&rect); vS+E`[  
  int x = (rect.Width() - cxIcon + 1) / 2; tJZ3P@ L  
  int y = (rect.Height() - cyIcon + 1) / 2; _D~FwF&A  
  // Draw the icon 3v:c'R0  
  dc.DrawIcon(x, y, m_hIcon); oh^QW`#(  
 } 5SwQ9#  
 else DeR C_ [  
 { -!pg1w06  
  CDialog::OnPaint(); ];au! _o  
 } ?<eH!MHF  
} * odwg$  
kU[#. y=%p  
HCURSOR CCaptureDlg::OnQueryDragIcon() ? EXYLG  
{ QB#rf='  
 return (HCURSOR) m_hIcon;  e6hfgVN  
} ~YCZvJ  
o_&*?k*  
void CCaptureDlg::OnCancel() XXZ<r  
{ xC.Tipn>  
 if(bTray) "2 J2za  
  DeleteIcon(); zT"W(3  
  CDialog::OnCancel(); "gGv>]3  
} eU m,=s  
/&g~*AL  
void CCaptureDlg::OnAbout() ]R8JBnA  
{ rQ287y{  
 CAboutDlg dlg; i[a1ij=  
 dlg.DoModal(); CxJkT2  
} =@0/.oSD  
$VyH2+ jC  
void CCaptureDlg::OnBrowse() V [r1bF  
{ Pvu*Y0_p  
 CString str; CWS&f g%o{  
 BROWSEINFO bi; a<mM )[U  
 char name[MAX_PATH]; \XT~5N6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )MU)'1jc,  
 bi.hwndOwner=GetSafeHwnd(); o<nkK+=Afm  
 bi.pszDisplayName=name; >.f'_2#Z&  
 bi.lpszTitle="Select folder"; v* /}s :a  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; `%A>{A"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); {/PiX1mn  
 if(idl==NULL) ^h\Y.  
  return; 6=i@t tAK  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 23~KzC  
 str.ReleaseBuffer(); +LeM[XX  
 m_Path=str; x4nmDEpa  
 if(str.GetAt(str.GetLength()-1)!='\\') 7\sRf/  
  m_Path+="\\"; $mq @g  
 UpdateData(FALSE); vK~tgZ&  
} JN:EcVuy  
e!JC5Al7  
void CCaptureDlg::SaveBmp() c 6Z\ecH9  
{ 3pk `&'  
 CDC dc; /5 6sPl 7}  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >pq= .)X}  
 CBitmap bm; <\C/;  
 int Width=GetSystemMetrics(SM_CXSCREEN); Or*e$uMIY  
 int Height=GetSystemMetrics(SM_CYSCREEN); P{_Xg,Z  
 bm.CreateCompatibleBitmap(&dc,Width,Height); |>L|7>J{<d  
 CDC tdc; QvjOOc@k~n  
 tdc.CreateCompatibleDC(&dc); y( uE  
 CBitmap*pOld=tdc.SelectObject(&bm); Ec;{N  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ZVX!=3VT  
 tdc.SelectObject(pOld); 5zR9N>!c  
 BITMAP btm; dE0 p>4F  
 bm.GetBitmap(&btm); Vv3{jn6%  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; +U];  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9 9S-P}xd  
 BITMAPINFOHEADER bih; `U[s d*C"  
 bih.biBitCount=btm.bmBitsPixel; ?ta(`+"  
 bih.biClrImportant=0; ej9|Y5D"S  
 bih.biClrUsed=0; X9oxni#  
 bih.biCompression=0; {#X]D~;s+  
 bih.biHeight=btm.bmHeight; .|Zt&5osI  
 bih.biPlanes=1; A,'JmF$d  
 bih.biSize=sizeof(BITMAPINFOHEADER); B>"O~ gZ{#  
 bih.biSizeImage=size; ~99DE78  
 bih.biWidth=btm.bmWidth; p!]$!qHO (  
 bih.biXPelsPerMeter=0; {3{cU#\QA  
 bih.biYPelsPerMeter=0; ui$JQ_P  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); b9gezXAcd  
 static int filecount=0; j9G1  _  
 CString name; a2tRmil  
 name.Format("pict%04d.bmp",filecount++); :`w'}h7m  
 name=m_Path+name; mFdj+ &2\  
 BITMAPFILEHEADER bfh; eH9Ofhsry  
 bfh.bfReserved1=bfh.bfReserved2=0; /<WK2G  
 bfh.bfType=((WORD)('M'<< 8)|'B'); b ?-VZA:  
 bfh.bfSize=54+size; i1E~F  
 bfh.bfOffBits=54; f R?Xq@c  
 CFile bf; N 2\lBi  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ bO2s'!x  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ohPCYt  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]~H\X":[>  
  bf.WriteHuge(lpData,size); oPPxja g\  
  bf.Close(); d5O_~x f&  
  nCount++; IxQ(g#sj_k  
 } =A< Fcl\Rz  
 GlobalFreePtr(lpData); 1<ic 5kB  
 if(nCount==1) 'ixu+.ZL/  
  m_Number.Format("%d picture captured.",nCount); VkChRzhC  
 else 1>"[b8a/  
  m_Number.Format("%d pictures captured.",nCount); jjLwHJ  
  UpdateData(FALSE); m5/d=k0l  
} B"rfR_B2M#  
f8c'`$O  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) _R 6+bB$  
{ 6bXR?0$*M.  
 if(pMsg -> message == WM_KEYDOWN) ToVi;  
 { ;&N=t64"  
  if(pMsg -> wParam == VK_ESCAPE) 2a 3RRP  
   return TRUE; WFTXSHcG  
  if(pMsg -> wParam == VK_RETURN) yaD_c;  
   return TRUE; X/l{E4Ex  
 } [G/ti&Od^  
 return CDialog::PreTranslateMessage(pMsg); XzBnj7E  
} ,4&?`Q  
<@puWm[p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >m-VBo  
{ {hmC=j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [_pw|BGp  
  SaveBmp(); MY]<^/Q  
  return FALSE; 6 ?C|pO  
} j~Cch%%G  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ f*IC ZM  
 CMenu pop; O ^+H:Y|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); x]=s/+Y  
 CMenu*pMenu=pop.GetSubMenu(0); 7ZsBYP8%  
 pMenu->SetDefaultItem(ID_EXITICON); k,mgiGrQ  
 CPoint pt; c\\'x\J7  
 GetCursorPos(&pt); sOY+ X  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); f0lpwwe  
 if(id==ID_EXITICON) | pA  
  DeleteIcon(); g$N/pg2>cT  
 else if(id==ID_EXIT) K_" denzT+  
  OnCancel(); TOe=6 Z5h  
 return FALSE; /#C}1emK  
} sBLf(Q,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ZHWxU  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PqJB&:ZV  
 AddIcon(); yDil  
 return res; d}Y\; '2,  
} ,R~{$QUl  
k)t_U3i  
void CCaptureDlg::AddIcon() 7l~d_<h  
{ H`:2J8   
 NOTIFYICONDATA data; b,tf]Z-  
 data.cbSize=sizeof(NOTIFYICONDATA);  KDX1_r=Y  
 CString tip; P,}cH;w6Ck  
 tip.LoadString(IDS_ICONTIP); fUg<+|v*  
 data.hIcon=GetIcon(0); `v|w&ty*  
 data.hWnd=GetSafeHwnd(); 1ab_^P  
 strcpy(data.szTip,tip); ,_N+t:*#0  
 data.uCallbackMessage=IDM_SHELL; l 7XeZ} S  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $:i%\7=  
 data.uID=98; wIbxnn  
 Shell_NotifyIcon(NIM_ADD,&data); w I7iE4\vz  
 ShowWindow(SW_HIDE); 1_of;=9V  
 bTray=TRUE; ;tZ;C(;<  
} \Xr Sn_p-  
I+4#LR3;  
void CCaptureDlg::DeleteIcon() =G9 9U/  
{ U_8 Z&  
 NOTIFYICONDATA data; fVXZfq6  
 data.cbSize=sizeof(NOTIFYICONDATA); 6` 8H k;  
 data.hWnd=GetSafeHwnd(); bl8EzO  
 data.uID=98; FkH HTO  
 Shell_NotifyIcon(NIM_DELETE,&data); dx&!RK+  
 ShowWindow(SW_SHOW); E0s|eA&  
 SetForegroundWindow(); A%[ BCY_  
 ShowWindow(SW_SHOWNORMAL); <*/IV<  
 bTray=FALSE; %wDE+&M  
} >STAPrBp+  
zarxv| }$  
void CCaptureDlg::OnChange() JoCZ{MhM  
{ KmYSYNr@,  
 RegisterHotkey(); v/m} {&K  
} )9]DJ!]&Q"  
.S{FEV  
BOOL CCaptureDlg::RegisterHotkey() QCD MRh n  
{ J_|LG rt})  
 UpdateData(); F+m%PVW:  
 UCHAR mask=0; n`Y"b&  
 UCHAR key=0; 0|J]EsPxu  
 if(m_bControl) "?X,);5S  
  mask|=4; :]rb}1nLB  
 if(m_bAlt) `k.Tfdu)K  
  mask|=2;  mdtG W  
 if(m_bShift) %tvP\(]h  
  mask|=1; cS2PrsUx  
  key=Key_Table[m_Key.GetCurSel()]; W0 n?S "  
 if(bRegistered){ "PD^]m  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); kF@Z4MB}yr  
  bRegistered=FALSE; )-s9CWJv  
 } 'xP&u<(F  
 cMask=mask; $1E'0M`  
 cKey=key; <3)k M&.B  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); sP'U9l  
 return bRegistered; %A$5mi^  
} fFNs cY<4w  
X3dXRDB'  
  四、小结 9zL(PkC%\  
V'q?+p] 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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