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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: \(Ma>E4PNU  
  @b(@`yz.a  
  一、实现方法 AXbb-GK  
+$C9@CZM9  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ]xRR/S4  
CR [>5/:M  
#pragma data_seg("shareddata") \GEz.Vb  
HHOOK hHook =NULL; //钩子句柄 'Xik2PaO  
UINT nHookCount =0; //挂接的程序数目 a en%  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #$UwJB]_D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 N8 2 6xvA  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey kqB# 9  
static int KeyCount =0; ?NA $<0  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 NfDS6i.Fqp  
#pragma data_seg() !Q\*a-C  
lw3H 8[  
  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。 V7WL Gy.,  
n n F  
  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: q 4Pv\YO  
$~5H-wJ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR >_j(uw?u  
cKey,UCHAR cMask) b_sasZo  
{ G$,s.MSf  
 BOOL bAdded=FALSE; dOv\]  
 for(int index=0;index<MAX_KEY;index++){ //NV_^$y  
  if(hCallWnd[index]==0){ h1S)B|~8  
   hCallWnd[index]=hWnd; w6Gez~ 8  
   HotKey[index]=cKey; O.jm{x!m  
   HotKeyMask[index]=cMask; L9)gN.#  
   bAdded=TRUE; g#(+:^3'  
   KeyCount++; {N]WVp*R  
   break; k2Cq9kQq  
  } eFsl  
 } 2#NnA3l]x%  
 return bAdded; g7323m1=  
} IhzY7U)}T  
//删除热键 QyCrz{/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =x+1A)Q  
{ 4Pr^>m  
 BOOL bRemoved=FALSE; mh4 VQ9  
 for(int index=0;index<MAX_KEY;index++){ XHv m{z=  
  if(hCallWnd[index]==hWnd){ qGq]E `O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $-/-%=  
    hCallWnd[index]=NULL; g5U,   
    HotKey[index]=0; XOX$uLm  
    HotKeyMask[index]=0; `XF[A8@h  
    bRemoved=TRUE; wdj?T`4  
    KeyCount--; 9+ Mj$  
    break; z:S:[X 0  
   } $cn8]*Z =  
  } { 1~]}K2  
 } {;Hg1=cm  
 return bRemoved; xJw" 8V<  
} l`~$cK!  
: F3UJ[V  
Z42q}Fhm*R  
  DLL中的钩子函数如下: X"3p/!W.4  
CnuM=S:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^5MM<73  
{ H.M: cD:  
 BOOL bProcessed=FALSE; ts&\JbL  
 if(HC_ACTION==nCode) r;b`@ .  
 { +s_a{iMVP  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 d_(;sW"I  
   switch(wParam) ?#c "wA&  
   {  8m H6?,@6  
    case VK_MENU: `6-flc0r  
     MaskBits&=~ALTBIT; /Q W^v;^  
     break; ?r =`Kl  
    case VK_CONTROL: Q65M(x+oy  
     MaskBits&=~CTRLBIT; %{'[S0@Z  
     break; O<wH+k[  
    case VK_SHIFT: #k<l5x`  
     MaskBits&=~SHIFTBIT; Q(x=;wf5r  
     break;  e+#Oj  
    default: //judge the key and send message Q,9KLi3  
     break; iuqJPW^}  
   } m.6uLaD"!}  
   for(int index=0;index<MAX_KEY;index++){ D]d! lMK/  
    if(hCallWnd[index]==NULL) 9FC_B+7  
     continue; o9ys$vXt*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) & :W6O)uY  
    { x-@?:P*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x!85P\sm  
     bProcessed=TRUE; ;[lLFI  
    } zI"&g]TV5  
   } 2N-p97"g  
  }  S\ZCZ0  
  else if((lParam&0xc000ffff)==1){ //有键按下 EhD%  
   switch(wParam) ,]qc#KDq-1  
   { oT:w GBW  
    case VK_MENU: s%#u)nw19  
     MaskBits|=ALTBIT; F*z>B >{)  
     break; $0{ h Uex  
    case VK_CONTROL: {?w *n_T.  
     MaskBits|=CTRLBIT; 3>5gh8!-  
     break; i+Ne.h  
    case VK_SHIFT: 1mh7fZgn  
     MaskBits|=SHIFTBIT; [vBP,_Tjx  
     break; # mM9^LJ   
    default: //judge the key and send message ~yngH0S$[b  
     break; Ozulp(8*  
   } a{;+_J3S  
   for(int index=0;index<MAX_KEY;index++){ .1h\r, #  
    if(hCallWnd[index]==NULL) ]9<H[5>$R  
     continue; Vl(id_~_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w4^ $@GtN  
    { ,DW q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4*n1Xu 7^x  
     bProcessed=TRUE; BB/c5?V  
    } qbD_  
   } ^}gZ+!kA  
  } ok-q9dM  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 RU.MJ kYQ5  
   for(int index=0;index<MAX_KEY;index++){ 4;jAdWj3  
    if(hCallWnd[index]==NULL) %0u5d$bq  
     continue; /lHs]) ,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <X5V]f  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); RY,L'Gt O  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2*-qEUl1  
   } 0|\JbM  
  } H?=[9?1wI5  
 } Vn^8nS  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {j[*:l0Ui  
} DM,;W`|6%  
g]b%<DJ  
  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: tuo'Uk)  
$0M7P5]N*G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #)T'a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }6__E;h#J  
sWq}/!@&  
  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: )Ps<u-V  
xnZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) TYxi &;w  
{ U|+`Eth8(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) li`  
 { WK SWOSJ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 TU| 0I  
  SaveBmp(); JS >"j d#  
  return FALSE; Nc(A5*  
 } AUU(fy#<  
 …… //其它处理及默认处理 >ZAn2s  
} ;[,#VtD  
M%eTNsbNm  
/5XdZu6k`h  
  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。 [}l 1`>  
0w$1Yx~C  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 !6+V  
%8"Aq  
  二、编程步骤 I\82_t8  
DC$x}1  
  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";  ZN;fDv  
cn ;2&  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; jdD`C`w|,  
T,4REbm^  
  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; HxShNU  
WZ@$bf}f0  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; I\6^]pi,  
qUNXT  
  5、 添加代码,编译运行程序。 tH4+S?PI  
e0o)Jo.P  
三、程序代码 @%As>X<3t  
p:4oA<V  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wIQt f|ZI>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 4Cf.%f9@  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Y#Pg*C8>8  
#if _MSC_VER > 1000 _ Av_jw`m  
#pragma once VSm{]Z!x  
#endif // _MSC_VER > 1000 yLvU@V@~  
#ifndef __AFXWIN_H__ n\4sNoFI  
#error include 'stdafx.h' before including this file for PCH v}"DW?  
#endif KQrG|<J  
#include "resource.h" // main symbols %y\  
class CHookApp : public CWinApp , *Z!Bd8  
{ 4"%LgV`  
 public: ohB@ijC!  
  CHookApp(); "[\TL#/  
  // Overrides h!]=)7x;  
  // ClassWizard generated virtual function overrides >VvA&p71b  
  //{{AFX_VIRTUAL(CHookApp) ,y*|f0&"~  
 public: P?YcZAJT*  
  virtual BOOL InitInstance(); J?bx<$C@  
  virtual int ExitInstance(); xAAwH@ +  
  //}}AFX_VIRTUAL 2xpI|+ a%  
  //{{AFX_MSG(CHookApp) q!8aYw+c  
  // NOTE - the ClassWizard will add and remove member functions here. b(:U]>J  
  // DO NOT EDIT what you see in these blocks of generated code ! FO xZkU\e=  
  //}}AFX_MSG XXPpj< c  
  DECLARE_MESSAGE_MAP() a.s5>:Ct  
}; ,CQg6- [  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); i~EFRI@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %pImCpMR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rIWQD%Afm  
BOOL InitHotkey(); :^992]EBEj  
BOOL UnInit(); 'C<4{agS  
#endif `-82u :"  
IkJ-*vI6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. pu6@X7W"  
#include "stdafx.h" 59M\uVWR  
#include "hook.h" o0F&,|'  
#include <windowsx.h> uBfSS\SX|  
#ifdef _DEBUG PFPZ]XI%F  
#define new DEBUG_NEW 5}"9)LT@@w  
#undef THIS_FILE AqucP@  
static char THIS_FILE[] = __FILE__; 4,qhWe`/  
#endif FWDAG$K@0  
#define MAX_KEY 100 &`Ek-b!7  
#define CTRLBIT 0x04 RD0=\!w*5  
#define ALTBIT 0x02 <K zEn+  
#define SHIFTBIT 0x01 ZA6)@Mn  
#pragma data_seg("shareddata") )TzQ8YpO}  
HHOOK hHook =NULL; R>n=_C  
UINT nHookCount =0; {#4F}@Q  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey p5\B0G<m  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT BXB ZX@jVk  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey :"I!$_E'  
static int KeyCount =0; cMp#_\B  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift T43Jgk,  
#pragma data_seg() .*Ylj2nM  
HINSTANCE hins; Z2D^]  
void VerifyWindow(); ![j?/376  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ;HoBLxb P  
//{{AFX_MSG_MAP(CHookApp) ` D={l29H  
// NOTE - the ClassWizard will add and remove mapping macros here. }*s`R;B|,  
// DO NOT EDIT what you see in these blocks of generated code! G#nZ%qQ:I  
//}}AFX_MSG_MAP ?]PE!7H  
END_MESSAGE_MAP() OV,t|  
$u P'>  
CHookApp::CHookApp() 6w)a.^yx7  
{ `A ^  
 // TODO: add construction code here, Bw25+l Px  
 // Place all significant initialization in InitInstance +Fa!<txn  
} JK'FJ}Z4  
Yh2[ nF_  
CHookApp theApp; ,u_ Z0S M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sFV&e->AN\  
{ _T\cJcWf  
 BOOL bProcessed=FALSE; 5L\&"['  
 if(HC_ACTION==nCode) @jY=b<  
 { k{ ~0BK  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2xK v;  
   switch(wParam) p(Ux]_s%  
   { h yK&)y?~  
    case VK_MENU: +^|_vq^XR  
     MaskBits&=~ALTBIT; E.eUd4XG  
     break; ?/|KM8  
    case VK_CONTROL: "."ow|  
     MaskBits&=~CTRLBIT; K*S3{s%UR  
     break; yc+pNC)ue_  
    case VK_SHIFT: *WaqNMD[%  
     MaskBits&=~SHIFTBIT; {;vLM* '  
     break; 5yk#(i 7C  
    default: //judge the key and send message ez<V  
     break; ]p!)8[<  
   } 'S%H"W\  
   for(int index=0;index<MAX_KEY;index++){ %z~=Jz^  
    if(hCallWnd[index]==NULL) L Q0e@5  
     continue; "fu:hHq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C?j:+  
    { f~ wgMp.W0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nO+R >8,Q  
     bProcessed=TRUE; &P7Z_&34Z  
    } )M><09  
   } AVi&cvhs  
  } lHAWZyO  
  else if((lParam&0xc000ffff)==1){ //Key down o$Ju\(Y$<+  
   switch(wParam) ^B:;uyG]M  
   { -}3nIk<N  
    case VK_MENU: =;Dj[<mJ45  
     MaskBits|=ALTBIT; TJCE6QG  
     break; f@[qS7ok  
    case VK_CONTROL: RdBIbm  
     MaskBits|=CTRLBIT; _&%FGcAS  
     break; ?N^1v&Q  
    case VK_SHIFT: $*|M+ofQ  
     MaskBits|=SHIFTBIT; &`oybm-p(  
     break; ~7an j.  
    default: //judge the key and send message #a9O3C/MP  
     break; b~qH/A}h  
   } M|NQoQ8q  
   for(int index=0;index<MAX_KEY;index++) k/(]1QnW  
   { te4=  
    if(hCallWnd[index]==NULL) ||?@pn\  
     continue; flT6y-d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .5uqc.i"f  
    { 6$[7hlE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `Qjs {H  
     bProcessed=TRUE; 3)yL#hXg)  
    } Re&"Q8I.8  
   } mRa\ wEg%  
  } s VHk;:e>x  
  if(!bProcessed){ -We9 FO~  
   for(int index=0;index<MAX_KEY;index++){ hD=.rDvO  
    if(hCallWnd[index]==NULL) v2_` iwE  
     continue; yM~bUmSg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1 +[sM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); C!|LGzs0  
   } Nte$cTjX  
  } :AS`1\ C  
 } vd)zvI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &O^-,n  
} {`G d  
r! HXhl  
BOOL InitHotkey() xJ2I@*DN  
{ %IZd-N7i^  
 if(hHook!=NULL){ yOt#6Vw  
  nHookCount++; 15hqoo9!  
  return TRUE; mf)+ 5On  
 } xEk8oc  
 else r *]pL<  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3 ye  
  if(hHook!=NULL) O`Gq7=X  
   nHookCount++; J|].h  
  return (hHook!=NULL); tM^4K r~o,  
} (6 Od   
BOOL UnInit() oFf9KHorW  
{ 6tndC o;`  
 if(nHookCount>1){ 50j8+xJPV  
  nHookCount--; [ r8 ZAS  
  return TRUE; F,{mF2U*$  
 } Yu>DgMW  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 8M@'A5]  
 if(unhooked==TRUE){ S.)Jp -&K  
  nHookCount=0; r]UF<*$  
  hHook=NULL; (XQuRL<X  
 } AoeRoqg&#  
 return unhooked; m$kQbPlatN  
} b.@a,:"  
acR|X@ \3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6FQi=}O1  
{ {@^;Nw%J  
 BOOL bAdded=FALSE; C=/B\G/.9  
 for(int index=0;index<MAX_KEY;index++){ m&Mupl  
  if(hCallWnd[index]==0){ dy&UF,l6  
   hCallWnd[index]=hWnd; ]MV8rC[\  
   HotKey[index]=cKey; 8~]D!c8;a  
   HotKeyMask[index]=cMask; 67YC;J]n=z  
   bAdded=TRUE; )&Oc7\J,  
   KeyCount++; ^k;]"NR  
   break; `x#Ud)g  
  } |zYOCDFf  
 } Ve3z5d:^  
 return bAdded; |4Q*4s  
} B6Vlc{c5SO  
{P]C>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }OL"38P  
{ :x)H!z P  
 BOOL bRemoved=FALSE; Dj&~x  
 for(int index=0;index<MAX_KEY;index++){ 3}0\W.jH  
  if(hCallWnd[index]==hWnd){ G @..?>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]R#:Bq!F  
    hCallWnd[index]=NULL; _U<fS  
    HotKey[index]=0; .B# .   
    HotKeyMask[index]=0; VThr]$2Y  
    bRemoved=TRUE; tcuwGs>_  
    KeyCount--; w +t@G`d  
    break; XH"+oW  
   } LH8jT  
  } CWn\K R  
 } -{cHp  
 return bRemoved; <Kd(fFe  
} !Rn6x $_  
/o9T [ ^\  
void VerifyWindow() h[ DNhR  
{ s[yWBew  
 for(int i=0;i<MAX_KEY;i++){ Wwq:\C  
  if(hCallWnd!=NULL){ 1F^Q*t{  
   if(!IsWindow(hCallWnd)){ {^VtD  
    hCallWnd=NULL; sgX!4wG&Z  
    HotKey=0; t4WB^dHYp  
    HotKeyMask=0; 8M,*w6P  
    KeyCount--; 1i76u!{U  
   } {PHH1dC{  
  } zfIo] M`  
 } L"bOc'GfQ  
} : \+xXb{  
I"07x'Ahq3  
BOOL CHookApp::InitInstance() { "y/;x/  
{ Xn6#q3;^|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8Bf >  
 hins=AfxGetInstanceHandle(); ToXWFX  
 InitHotkey(); f%Q{}fC{*  
 return CWinApp::InitInstance(); 3o<d= @`r  
} -Zt!H%U  
u6qK4*eAD  
int CHookApp::ExitInstance() "TV'}HH  
{ _C?j\Wy  
 VerifyWindow(); ')X (P>  
 UnInit(); f98,2I(>`+  
 return CWinApp::ExitInstance(); ;O"?6d0  
} PobX;Z  
LK^|JEu  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Hq3|>OqC2Q  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (o^tmH*  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~wvt:E,f C  
#if _MSC_VER > 1000 +HK4sA2;  
#pragma once '%N?r,x C  
#endif // _MSC_VER > 1000 ~P4C`Q1PT#  
^|Ap_!t$;  
class CCaptureDlg : public CDialog S* h52li  
{ Ma YU%h0  
 // Construction NVyBEAoh  
 public: @CMI$}!{V  
  BOOL bTray; (`x_MTLL  
  BOOL bRegistered; [GwAm>k  
  BOOL RegisterHotkey(); xEb>6+-F@  
  UCHAR cKey; DeO-@4+qKd  
  UCHAR cMask; ,+=9Rp`md  
  void DeleteIcon(); ,/;Ae w;  
  void AddIcon(); s\*L5{kiSl  
  UINT nCount; {15j'Qwm  
  void SaveBmp(); 48^-]};  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^QK`z@B  
  // Dialog Data "F F$Q#)  
  //{{AFX_DATA(CCaptureDlg) xQoZ[  
  enum { IDD = IDD_CAPTURE_DIALOG }; YagfCi ?  
  CComboBox m_Key; <Xf6?nyZ(  
  BOOL m_bControl; })g<I+]Hf9  
  BOOL m_bAlt; ^7gGtz2  
  BOOL m_bShift; @CprC]X  
  CString m_Path; > I2rj2M#  
  CString m_Number; c4JV~VS+  
  //}}AFX_DATA <2$vo  
  // ClassWizard generated virtual function overrides Ln"wj O ,  
  //{{AFX_VIRTUAL(CCaptureDlg) EX8JlA\-W  
 public: d?,'$$aB  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 7v: XAU  
 protected: agIqca;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b--=GY))F  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [FFr}\}bY  
  //}}AFX_VIRTUAL Q$%apL  
  // Implementation L%'J]HL-  
 protected: P/%7kD@5;  
  HICON m_hIcon; =i/Df ?  
  // Generated message map functions 5`;SI36"  
  //{{AFX_MSG(CCaptureDlg) a:FU- ^B4~  
  virtual BOOL OnInitDialog(); q_MN  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wu <0or2  
  afx_msg void OnPaint(); o`T.Zaik,  
  afx_msg HCURSOR OnQueryDragIcon(); l:HQ@FX  
  virtual void OnCancel(); VB |?S|<  
  afx_msg void OnAbout(); uD\R3cY  
  afx_msg void OnBrowse(); *x36;6~W;  
  afx_msg void OnChange(); "LBMpgpU  
 //}}AFX_MSG ,d"T2Hy  
 DECLARE_MESSAGE_MAP() c%&,(NJ]K  
}; ]OAU&t{  
#endif ot0teNF  
r,5e/X  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $BqiC!~  
#include "stdafx.h" Lg:1zC  
#include "Capture.h" ^<;W+dWdU  
#include "CaptureDlg.h" =RoE=) 1&-  
#include <windowsx.h> L+t / E`  
#pragma comment(lib,"hook.lib") ($di]lbsT  
#ifdef _DEBUG r~b.tpH  
#define new DEBUG_NEW A95f!a  
#undef THIS_FILE U/>I! 7oe  
static char THIS_FILE[] = __FILE__; /[R=-s ;  
#endif x]^d'o:cDP  
#define IDM_SHELL WM_USER+1 hf`y_H+\7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w,%"+ tY_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Agc ss20.  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1k[_DQ=^l1  
class CAboutDlg : public CDialog ,!= sGUQ)  
{ .k#PrT1C  
 public: ?QP>rm  
  CAboutDlg();  \XDiw~0  
  // Dialog Data g#S X$k-O  
  //{{AFX_DATA(CAboutDlg) Np\NStx2  
  enum { IDD = IDD_ABOUTBOX }; ib,`0=0= O  
  //}}AFX_DATA ~WrpJjI[  
  // ClassWizard generated virtual function overrides b8!oZ~ K  
  //{{AFX_VIRTUAL(CAboutDlg) ko%mZ0Y  
 protected: 01(U)F\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <bcf"0A  
  //}}AFX_VIRTUAL #  X (2  
  // Implementation 2dts}G  
 protected: '4,?YcZ?S  
  //{{AFX_MSG(CAboutDlg) !@C-|=9G  
  //}}AFX_MSG W ?x~"-*  
  DECLARE_MESSAGE_MAP() f6r!3y  
}; aB%.]bi  
Tzd#!Lvm:,  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Zma;An6  
{ !(*&P  
 //{{AFX_DATA_INIT(CAboutDlg) C  eEhe  
 //}}AFX_DATA_INIT FM]clC;X?  
} b+Q{Z*  
W @"Rdc-  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R0t!y3r&N  
{ jV% VN  
 CDialog::DoDataExchange(pDX); :k9T`Aa]  
 //{{AFX_DATA_MAP(CAboutDlg) VEV?$R7;  
 //}}AFX_DATA_MAP }$)~HmZw  
} 5K Ij}VN  
#( .G;e;w  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) " ILF!z  
 //{{AFX_MSG_MAP(CAboutDlg) W@!qp  
 // No message handlers mJ%^`mrI  
 //}}AFX_MSG_MAP 5Q"yn2b4  
END_MESSAGE_MAP() >p&"X 2 @  
<gPM/ 4$G  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~,,r\Y+  
: CDialog(CCaptureDlg::IDD, pParent) kB+$Kt<]L  
{ B9l~Y/3|  
 //{{AFX_DATA_INIT(CCaptureDlg) 4EYD5  
  m_bControl = FALSE; auI`'O`/  
  m_bAlt = FALSE; zE;|MU@|  
  m_bShift = FALSE; 5$i(f8*  
  m_Path = _T("c:\\"); i59 }6u_f  
  m_Number = _T("0 picture captured."); F=5+JjrX  
  nCount=0; YM#' +wl}`  
  bRegistered=FALSE; 0L;,\&*u  
  bTray=FALSE; pZ Uy (  
 //}}AFX_DATA_INIT ESviWCh0Fl  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Cuylozj$&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); k8G4CFg}wP  
} =lv(  
yR5XcPoKI  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) e@c8Ce|0  
{ e"1mdw"  
 CDialog::DoDataExchange(pDX); '!$ QI@@  
 //{{AFX_DATA_MAP(CCaptureDlg) '*[7O2\%/  
  DDX_Control(pDX, IDC_KEY, m_Key); 6Takx%U  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); <Z[Z&^  
  DDX_Check(pDX, IDC_ALT, m_bAlt); aGW O3Nk  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -qpvVLR,  
  DDX_Text(pDX, IDC_PATH, m_Path); ;{8 X+H  
  DDX_Text(pDX, IDC_NUMBER, m_Number); RrLj5Jq  
 //}}AFX_DATA_MAP `D3q!e  
} */~|IbZ`o  
3N]ushMO  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lB2 F09`  
//{{AFX_MSG_MAP(CCaptureDlg) "r`2V-E  
 ON_WM_SYSCOMMAND() ,or;8aYc#  
 ON_WM_PAINT() YS4"TOFw  
 ON_WM_QUERYDRAGICON() t(<k4ji,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) A99;bf}"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) qAp <OJ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ,aWI&ve6  
//}}AFX_MSG_MAP H.hKh  
END_MESSAGE_MAP() Z9H2! Cp  
ZC$u8$+P  
BOOL CCaptureDlg::OnInitDialog() Mmgm6{  
{ uJ|,-"~F  
 CDialog::OnInitDialog(); ,nog6\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); GQ85ykky  
 ASSERT(IDM_ABOUTBOX < 0xF000); U4Zx1ieCKH  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %/)z!}{  
 if (pSysMenu != NULL) XiV*d06{  
 { (7_ezWSl>  
  CString strAboutMenu; H [M:iV  
  strAboutMenu.LoadString(IDS_ABOUTBOX); c.Izm+9k  
  if (!strAboutMenu.IsEmpty()) jn]l!nm  
  { ; p+C0!B2  
   pSysMenu->AppendMenu(MF_SEPARATOR); xn=mS!"1Zo  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); &]f8Xd  
  } "1dpv \  
 } 0LGHSDb  
 SetIcon(m_hIcon, TRUE); // Set big icon sw$JY}Q8x  
 SetIcon(m_hIcon, FALSE); // Set small icon R0w~ Z   
 m_Key.SetCurSel(0); bTx4}>=5l  
 RegisterHotkey(); 3]\'Q}  
 CMenu* pMenu=GetSystemMenu(FALSE); (RUc>Qi  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]Gj%-5G  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \HMuV g'Q  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); NUBzc'qb  
 return TRUE; // return TRUE unless you set the focus to a control *Qngx  
} ?iaO+G&|  
EnMc9FN(y  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9e;{o,r@  
{ =%77~q-HL  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3nq4Y'  
 { C-:|A* z  
  CAboutDlg dlgAbout; mmC MsBfL  
  dlgAbout.DoModal(); {6}$XLV3l  
 } OK@yMGz1I  
 else SQ/}K8uZ  
 { kT^`j^Jr  
  CDialog::OnSysCommand(nID, lParam); W$}2 $}r0U  
 } s2tNQtq 0W  
} %@I= $8j  
)Zvn{  
void CCaptureDlg::OnPaint() *TL3-S?   
{ 7&dF=/:X@  
 if (IsIconic()) JFRbW Q0  
 { C]zG@O !  
  CPaintDC dc(this); // device context for painting .%\R L/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Z'wGZ(  
  // Center icon in client rectangle [ 7{cf`C  
  int cxIcon = GetSystemMetrics(SM_CXICON); 0sq?>$~Kc*  
  int cyIcon = GetSystemMetrics(SM_CYICON); "v'%M({  
  CRect rect; {FN CC*=  
  GetClientRect(&rect); e9F+R@8  
  int x = (rect.Width() - cxIcon + 1) / 2; _bCIVf`  
  int y = (rect.Height() - cyIcon + 1) / 2; On;7  
  // Draw the icon ;A?86o'?  
  dc.DrawIcon(x, y, m_hIcon); [Z[ p@Ux  
 } {ZUgyGE{  
 else fo;^Jg.  
 { |pT[ZT|}G  
  CDialog::OnPaint(); 9 b&HqkXX  
 } aqP"Y9l  
} . N5$s2t  
Z(ToemF)hi  
HCURSOR CCaptureDlg::OnQueryDragIcon() S2V+%Z _J  
{ T#YJ5Xw  
 return (HCURSOR) m_hIcon; _nIt4l7  
} <a(739IF  
e1H2w? s  
void CCaptureDlg::OnCancel() iT~ gt/K  
{ %G, d&%f  
 if(bTray) K!tM "`a  
  DeleteIcon(); p+F>+OQ*  
  CDialog::OnCancel(); za5E{<0  
} E`q)vk   
d?[8VfAnh  
void CCaptureDlg::OnAbout() 'Y5l3xQk  
{ l Ztw[c  
 CAboutDlg dlg; P7 qzZ  
 dlg.DoModal(); qc/)l~]?g{  
} ^B'N\[  
t|59/R  
void CCaptureDlg::OnBrowse() xtd1>|  
{ ?fvK<0S`  
 CString str; &bwI7cO  
 BROWSEINFO bi; ?,UO$#Xm  
 char name[MAX_PATH]; o=Kd9I#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); i=`@)E  
 bi.hwndOwner=GetSafeHwnd(); O<+x=>_  
 bi.pszDisplayName=name; $_u)~O4$  
 bi.lpszTitle="Select folder"; 0PJ7o#}_{@  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; M~*o =t  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Dp;6CGYl?  
 if(idl==NULL)  B"Ttr+  
  return; =BgQ Ss/^c  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6;}W)S  
 str.ReleaseBuffer(); a q]bF%7  
 m_Path=str; fsV_>5I6  
 if(str.GetAt(str.GetLength()-1)!='\\') (x8D ]a  
  m_Path+="\\"; d6g^>}-!t  
 UpdateData(FALSE); \r&9PkHWo  
} HhT6gJWrU  
6iJ\7  
void CCaptureDlg::SaveBmp() :cE~\B S&  
{ &&|c-mD+*  
 CDC dc; f>ilk Q`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); pa6-3c  
 CBitmap bm; LX;" Mz>  
 int Width=GetSystemMetrics(SM_CXSCREEN); ),U>AiF]  
 int Height=GetSystemMetrics(SM_CYSCREEN); cy( WD#^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); E3 aj  
 CDC tdc; gP>`DPgb^  
 tdc.CreateCompatibleDC(&dc); ? VHOh9|AT  
 CBitmap*pOld=tdc.SelectObject(&bm); 4w(#`'I>  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7\Wq:<JL  
 tdc.SelectObject(pOld); e'5sT#T9l  
 BITMAP btm; ,&rHBNS  
 bm.GetBitmap(&btm); r( 8!SVX  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ]"-c?%L  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7\ kixfEg  
 BITMAPINFOHEADER bih; s92SN F}g  
 bih.biBitCount=btm.bmBitsPixel; 629 #t`W\  
 bih.biClrImportant=0; ])$Rw $`w  
 bih.biClrUsed=0; ^Z:qlYZ  
 bih.biCompression=0; FKk.BA957h  
 bih.biHeight=btm.bmHeight; N Uo   
 bih.biPlanes=1; #'oGtFCd`  
 bih.biSize=sizeof(BITMAPINFOHEADER); gSXidh}^  
 bih.biSizeImage=size; ^z}$ '<D9  
 bih.biWidth=btm.bmWidth; \[W)[mH_  
 bih.biXPelsPerMeter=0; NmZowh$M  
 bih.biYPelsPerMeter=0;  @1O.;  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); W60C$*h  
 static int filecount=0; I2<5#|CXpZ  
 CString name; hScC< =W  
 name.Format("pict%04d.bmp",filecount++); s|o+ Im  
 name=m_Path+name; 3.<E{E!F  
 BITMAPFILEHEADER bfh; gP:H_nVh  
 bfh.bfReserved1=bfh.bfReserved2=0; _/@u[dWeL  
 bfh.bfType=((WORD)('M'<< 8)|'B'); b[`fQv$G  
 bfh.bfSize=54+size; clO9l=g  
 bfh.bfOffBits=54; ?S~j2 J]  
 CFile bf; O#B2XoZa+  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ M5T4{^i  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); D:vX/mf;7  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); VJ()sbl{k  
  bf.WriteHuge(lpData,size); $I:&5o i  
  bf.Close(); .<kbYo:MV  
  nCount++; 9KGi%UIFvn  
 } !pAb+6~T  
 GlobalFreePtr(lpData); .p$tb2%r  
 if(nCount==1) x4%1P w  
  m_Number.Format("%d picture captured.",nCount); ?$Jj^/luD  
 else M sQ>eSk  
  m_Number.Format("%d pictures captured.",nCount); {'$+?V"&  
  UpdateData(FALSE); o%sx(g=q6  
} Gx/kel[Y}  
e]q(fPK  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \:D"#s%x  
{ _fE$KaP  
 if(pMsg -> message == WM_KEYDOWN) "z9 p(|oZ  
 { {?hpW+1,#  
  if(pMsg -> wParam == VK_ESCAPE) |cIv&\ x  
   return TRUE; /YHAU5N/}  
  if(pMsg -> wParam == VK_RETURN) QP:|D_k  
   return TRUE; "1|\V.>>;  
 } qEajT"?  
 return CDialog::PreTranslateMessage(pMsg); Zj5B}[,l\  
} s5 ($b  
E) z=85;_p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \k>1q/T0V  
{ $~r_&1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ SBh"^q  
  SaveBmp(); +\)a p  
  return FALSE; @M&qH[tK-A  
} 2pmqP-pKd  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~>B`T%=H  
 CMenu pop; g#b9xTG J^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Wf:LYL  
 CMenu*pMenu=pop.GetSubMenu(0); ^\C Fke=  
 pMenu->SetDefaultItem(ID_EXITICON); lFZl}x  
 CPoint pt;  rBUWzpE"  
 GetCursorPos(&pt); fprP$MbI  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CRs@x` 5ue  
 if(id==ID_EXITICON) 7^W(es  
  DeleteIcon(); pj#ls  
 else if(id==ID_EXIT) yV?qX\~*  
  OnCancel(); ToX--w4  
 return FALSE; vo>i36  
} TX).*%f [r  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); C2C 1 @=w  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) UU*v5&  
 AddIcon(); 3 nnoXc'  
 return res; w0^}c8%WR  
} H*HL:o-[  
wDDNB1_ E  
void CCaptureDlg::AddIcon() W5,&*mo  
{ r1 [c+Hy  
 NOTIFYICONDATA data; <S3s==Cg  
 data.cbSize=sizeof(NOTIFYICONDATA); %ty`Oa2  
 CString tip; 7j8lhrM}^  
 tip.LoadString(IDS_ICONTIP); .t7ME{  
 data.hIcon=GetIcon(0); ?azcWf z0  
 data.hWnd=GetSafeHwnd(); Y.kgJ #2  
 strcpy(data.szTip,tip); *Gul|Lp$<I  
 data.uCallbackMessage=IDM_SHELL; o3JSh=  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >R}G  
 data.uID=98; mgMa)yc!dp  
 Shell_NotifyIcon(NIM_ADD,&data); ksf6O$  
 ShowWindow(SW_HIDE); 9,[A fI  
 bTray=TRUE; 3,?LpdTS  
} b/?)_pg  
0.)q5B`  
void CCaptureDlg::DeleteIcon() gI!d*]{BP  
{ W*B=j[w  
 NOTIFYICONDATA data; >t{-_4Yv?  
 data.cbSize=sizeof(NOTIFYICONDATA); @FZbp  
 data.hWnd=GetSafeHwnd(); R@){=8%z  
 data.uID=98; ,b4oV  
 Shell_NotifyIcon(NIM_DELETE,&data); _L+j6N.h1  
 ShowWindow(SW_SHOW); C8x9 Jrc  
 SetForegroundWindow(); lffw "  
 ShowWindow(SW_SHOWNORMAL); V*DDU]0k  
 bTray=FALSE; q%LjOPE V  
} 3 Ak'Ue  
QBh*x/J  
void CCaptureDlg::OnChange() k~F;G=P  
{ Dt! <  
 RegisterHotkey(); ) "Z6Q5k^  
} j WSgO(y  
P=PeWX*L<Z  
BOOL CCaptureDlg::RegisterHotkey() v: veKA  
{ T%Bz>K  
 UpdateData(); D|*yeS4>  
 UCHAR mask=0; y^z c @f  
 UCHAR key=0; =X9fn  
 if(m_bControl) ZZL@UO>:  
  mask|=4;  AGm=0Om  
 if(m_bAlt) TOhWfl;  
  mask|=2; \~g,;>%7Y  
 if(m_bShift) Si@ 6'sw  
  mask|=1; \t 5_V)P  
  key=Key_Table[m_Key.GetCurSel()]; OADW;fj  
 if(bRegistered){ r@/@b{=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Kv2S&P|jXM  
  bRegistered=FALSE; >bd@2au9!  
 } 9)t[YE:U3!  
 cMask=mask; &Q#*Nnb3  
 cKey=key; &>B"/z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I\x9xJ4x  
 return bRegistered; 8t. QFze?  
} 9ln=f=  
y$9! rbL  
  四、小结 &=MVX>[  
;>L8&m)R5  
  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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