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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: v4.#;F.\m  
  !=:$lzS^  
  一、实现方法 Gch[Otq]%  
#[`:'e  
  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: }0X:F`Y-  
jhg;%+KB  
#pragma data_seg("shareddata") U2wbvXr5-  
HHOOK hHook =NULL; //钩子句柄 Vy938qX   
UINT nHookCount =0; //挂接的程序数目 yRfSJbzaf\  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ^WNrGF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @p NNq  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 26k LhFS  
static int KeyCount =0; HO}Hh[{V9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 V` 1/SQX  
#pragma data_seg() q~vDz]\G  
/gu%:vq  
  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。 j(k: @  
8qEVOZjV&  
  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: 45MLt5^|  
,J{ei7TN  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR A0q|J/T  
cKey,UCHAR cMask) d~`x )B(  
{ $[/&74#0HX  
 BOOL bAdded=FALSE; 9J>&29@us0  
 for(int index=0;index<MAX_KEY;index++){ j.L-{6_s>~  
  if(hCallWnd[index]==0){ p-zXp K"  
   hCallWnd[index]=hWnd; w`il=ZAC  
   HotKey[index]=cKey; +{W>i;U  
   HotKeyMask[index]=cMask; /s[l-1zW  
   bAdded=TRUE; r;Gi+Ca5  
   KeyCount++; %JHGiCv|  
   break; V8HnUuz  
  } },>pDeX^P  
 } }= 6'MjF]  
 return bAdded; fbL\?S,w  
} k'IYA#T6  
//删除热键 G1"zElug  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I]&#Dl/  
{ 8rMX9qTO@  
 BOOL bRemoved=FALSE; fe_yqIdk  
 for(int index=0;index<MAX_KEY;index++){ pm\x~3jHs  
  if(hCallWnd[index]==hWnd){ w[ !^;#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ MV\|e1B}  
    hCallWnd[index]=NULL; IuOgxm~Y  
    HotKey[index]=0; k?z98 >4  
    HotKeyMask[index]=0; 1!1 beR]  
    bRemoved=TRUE; nM-h&na{s  
    KeyCount--; sM?MLB\Za  
    break; M5*{  
   } u\LFlX0sO  
  } Sk:ws&D1u  
 } bV8!"{  
 return bRemoved; 1Lg-.-V  
} 20iq2  
yfx7{naKC`  
q*7zx_ o  
  DLL中的钩子函数如下: KTn}w:+B\  
|d*&y#kV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4 &_NJ\  
{ 8}FzZ?DRy  
 BOOL bProcessed=FALSE; NLrPSqz  
 if(HC_ACTION==nCode) t@R ?Rgu3  
 { HE'2"t[a  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *r=:y{!Yd  
   switch(wParam) O=$~O\}b  
   {  *+\S yO  
    case VK_MENU: <%Ostqj  
     MaskBits&=~ALTBIT; tX@_fYb  
     break; t: IN,Kl4  
    case VK_CONTROL: E/09hD Q  
     MaskBits&=~CTRLBIT; Mnz!nWhk  
     break; $zyIuJN#  
    case VK_SHIFT: 2A\,-*pc  
     MaskBits&=~SHIFTBIT; LNa$ X5`  
     break; t\ 7~S&z  
    default: //judge the key and send message c{&*w")J  
     break; W3;#fa:[L  
   } |{@8m9JR  
   for(int index=0;index<MAX_KEY;index++){ UY<e&Npo  
    if(hCallWnd[index]==NULL) &CIVL#];e  
     continue; GD:4"$)[o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X*,%&6O*  
    { F P>)&3>_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]Lm9^q14m  
     bProcessed=TRUE; Vg>(  Y,  
    } #Ap;_XcKw  
   } :OkT? (i  
  } q-`RI*1]  
  else if((lParam&0xc000ffff)==1){ //有键按下 |<Gl91  
   switch(wParam) gt ";2,;X  
   { zt<WXw(  
    case VK_MENU: h^*4}GU  
     MaskBits|=ALTBIT; XO9M_*Va  
     break; $YXMI",tt<  
    case VK_CONTROL: OZIW_'Wm/  
     MaskBits|=CTRLBIT; \T\b NbPn  
     break; :T._ba3|  
    case VK_SHIFT: ^m /oDB-  
     MaskBits|=SHIFTBIT; {XW Z<OjG  
     break; !j\" w p  
    default: //judge the key and send message t(+) #  
     break; }?@rO`:EF+  
   } sU!6hk  
   for(int index=0;index<MAX_KEY;index++){ .(X lg-H,  
    if(hCallWnd[index]==NULL) x+h~gckLb  
     continue; Mze;k3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \y88d4zX  
    { :KKa4=5L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *5wu   
     bProcessed=TRUE; sT/c_^y  
    } [F*4EGB  
   } &tZG @  
  } 1O!/g  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .iQT5c  
   for(int index=0;index<MAX_KEY;index++){ /%I7Vc  
    if(hCallWnd[index]==NULL) "&/]@)TPz  
     continue; Hh4 n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b:(-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); A+&xMM2Wj  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 1N\D5g3  
   } sjM;s{gy  
  } * FeQ*`r  
 } ?hR7<02  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -3&G"hfK  
} 9M /SH$Qy  
`$YP<CJeq  
  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: bC^(U`y32  
O Lc}_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `T2$4>!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `' 153M]  
6ATtW+sN]  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Qe'g3z>  
]=EM@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Z/6qG0feJ  
{ {&[9iIf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &(a(W22O  
 { : 5U"XY x@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 3pXLSdxB  
  SaveBmp(); cM&2SRBZ  
  return FALSE; &6j<ca  
 } ^#):c`  
 …… //其它处理及默认处理 >|o_wO  
} 2`a q**}  
45@]:2j  
j+8TlVur  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 gFPi7 o1  
s-W[ .r|  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 46h@j>/K  
f&hwi:t  
  二、编程步骤 70B)|<$  
dp5f7>]:(  
  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"; ;50_0Mv;(:  
+jqj6O@Tjr  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;$BdP7i:  
6S.~s6o,  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; nPkZHIxuD  
p{=QGrxB*  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; tJ=di5&  
RiO="tX'  
  5、 添加代码,编译运行程序。 >?YNW   
eX2<}'W<  
三、程序代码 DJQglt}~  
`!G7k  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL uD[ "{?H  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) AaN"7.Z/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ R: aYL~  
#if _MSC_VER > 1000 0m+8P$)C%  
#pragma once x7RdZC  
#endif // _MSC_VER > 1000 }t>q9bZ9z  
#ifndef __AFXWIN_H__ QMk+RM8U  
#error include 'stdafx.h' before including this file for PCH nSY-?&l6P  
#endif mEQ!-p   
#include "resource.h" // main symbols ]=D5p_A(  
class CHookApp : public CWinApp _a+ICqR  
{ ); 6,H.v  
 public: TRKgBK$,  
  CHookApp(); )Hf~d=GG  
  // Overrides L"rcv:QWZa  
  // ClassWizard generated virtual function overrides IX?ZbtdX$`  
  //{{AFX_VIRTUAL(CHookApp) qi+&|80T.  
 public: \~X&o% y  
  virtual BOOL InitInstance(); hteOh#0{   
  virtual int ExitInstance(); &-GuKH(Y<  
  //}}AFX_VIRTUAL PaVO"y]C  
  //{{AFX_MSG(CHookApp) ?An,-N-ezf  
  // NOTE - the ClassWizard will add and remove member functions here. =p&sl;PsLw  
  // DO NOT EDIT what you see in these blocks of generated code ! el'j&I  
  //}}AFX_MSG wk 02[  
  DECLARE_MESSAGE_MAP() Dw |3Z  
}; CW:gEm+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); hXX1<~k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Qg0vG]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^t78jfl  
BOOL InitHotkey(); d.pp3D 9/  
BOOL UnInit(); Y&,rTa  
#endif i<u9:W  
n9 fk,3  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Q#WE|,a  
#include "stdafx.h" M^ 5e~y  
#include "hook.h" @8"18HEp#  
#include <windowsx.h> yL"i  
#ifdef _DEBUG tF`MT%{Va  
#define new DEBUG_NEW 6s,2NeVWa  
#undef THIS_FILE ypA:  P  
static char THIS_FILE[] = __FILE__; n(jjvLf  
#endif "2mFC!  
#define MAX_KEY 100 ozxYH],  
#define CTRLBIT 0x04 >38 Lt\  
#define ALTBIT 0x02 bag&BHw  
#define SHIFTBIT 0x01 ~JE|f 7  
#pragma data_seg("shareddata") Za!w#j%h  
HHOOK hHook =NULL; Wg(bD,  
UINT nHookCount =0; ZT9IMihV  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !BRcq~-.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @xJCn}`Zj  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey m;h<"]<  
static int KeyCount =0; <9\,QR)  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift E!@/NE\-  
#pragma data_seg() P Ey/k.  
HINSTANCE hins; ;\s~%~ \  
void VerifyWindow(); =yh3Nd:u  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `Z8^+AMc  
//{{AFX_MSG_MAP(CHookApp) s$3`X(Pn  
// NOTE - the ClassWizard will add and remove mapping macros here. </yo9.  
// DO NOT EDIT what you see in these blocks of generated code! -,/3"}<^78  
//}}AFX_MSG_MAP !2tw,QM  
END_MESSAGE_MAP() c `ud;lI  
y.fs,!|%@  
CHookApp::CHookApp() !u%9;>T7  
{ k<,u0  
 // TODO: add construction code here, jI Z+d;1  
 // Place all significant initialization in InitInstance _-6e0srZ  
} gr\@sx?b  
:p&IX"Hh  
CHookApp theApp; |>@ -grs  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [Gf{f\O  
{ 4 iKR{P6  
 BOOL bProcessed=FALSE; e2Ww0IK!E  
 if(HC_ACTION==nCode) TC@bL<1  
 { QxA0I+i  
  if((lParam&0xc0000000)==0xc0000000){// Key up v\'r Xy  
   switch(wParam) oc((Yo+B  
   { 1XGG.+D  
    case VK_MENU: 9H[/Tj-;  
     MaskBits&=~ALTBIT; jjX%$Hr  
     break; [NZ-WU&&LP  
    case VK_CONTROL: J& )#G@fRX  
     MaskBits&=~CTRLBIT; yFi6jN#~  
     break; H lF}   
    case VK_SHIFT: `>\4"`I  
     MaskBits&=~SHIFTBIT; +/w(K,  
     break; ^ePsIl1E  
    default: //judge the key and send message O!yakU+  
     break; QS5H >5M)  
   } >j) w\i  
   for(int index=0;index<MAX_KEY;index++){ 2@4x"F]U;  
    if(hCallWnd[index]==NULL) Q QT G9s  
     continue; |&Au6 3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &q"'_4  
    { |@+8]dy:l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \ U Ax(;  
     bProcessed=TRUE; ]u;GNz}?  
    } QP+c?ct}hF  
   } .B6`OX&k  
  } mZ~mf->%  
  else if((lParam&0xc000ffff)==1){ //Key down E3LBPXK  
   switch(wParam)  YN4"O>  
   { Ew>~a8! Fq  
    case VK_MENU: O1|B3M[P  
     MaskBits|=ALTBIT; m';#R9\Fz  
     break; Lr wINVa  
    case VK_CONTROL: 0Y[*lM-  
     MaskBits|=CTRLBIT; >1m)%zt  
     break; <Kh?Ad>N  
    case VK_SHIFT: g)X7FxS,z  
     MaskBits|=SHIFTBIT; Xm%iPrl D  
     break; (rAiDRQ[  
    default: //judge the key and send message _k6x=V;9g  
     break; Q^[e/U,  
   } ^=Q8]W_*  
   for(int index=0;index<MAX_KEY;index++) Z@;jIH4 (  
   { ^GE^Q\&D&  
    if(hCallWnd[index]==NULL) HE*7\"9  
     continue; ,Y$F7&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "3\oQvi.  
    { 4[2=L9MIo~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); i5.?g<.H  
     bProcessed=TRUE; &$<(D0  
    } f3/SO+Me}  
   } dFd lB `L  
  } h U 9\y  
  if(!bProcessed){ N[0 xqQ  
   for(int index=0;index<MAX_KEY;index++){ N$C{f;xV  
    if(hCallWnd[index]==NULL) UaH26fWs  
     continue; \m(ymp<c`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \s.1R/TyD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); C(EYM$  
   } i:V0fBR[>  
  } caGML|DeI  
 } 8$2l^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <sgZ3*,A  
} jK\V|5k  
BjH~Ml2  
BOOL InitHotkey() a];BW)  
{ G /NT e  
 if(hHook!=NULL){ nu;} S!J  
  nHookCount++; fndK/~?]H  
  return TRUE; )`B -O::  
 } _7rqXkp%  
 else f@wsS m  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); R#"U/8b>z  
  if(hHook!=NULL) /1IvLdPIu  
   nHookCount++; -@YVe:$%b  
  return (hHook!=NULL); QN)/,=#  
} ATKYjhc _  
BOOL UnInit() M,.b`1-w  
{ N90\]dFmy  
 if(nHookCount>1){ (! xg$Kz@  
  nHookCount--; HF*j`}  
  return TRUE; i!CKA}",  
 } Am>_4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0t5Q9#RY  
 if(unhooked==TRUE){ "WF( 6z#  
  nHookCount=0; <bEN8b  
  hHook=NULL; B]A 5n8<  
 } Vpug"aR&_  
 return unhooked; 4 ?9soc  
} >/7KL2*  
D}zOuB,S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }ZEfT]  
{ !Z#_X@NFc  
 BOOL bAdded=FALSE; YWt"|  
 for(int index=0;index<MAX_KEY;index++){ hKk\Y{wv'  
  if(hCallWnd[index]==0){ 8C*6Fjb#  
   hCallWnd[index]=hWnd; 7sQ]w   
   HotKey[index]=cKey; 3R)cbwL  
   HotKeyMask[index]=cMask; .\z|Fr  
   bAdded=TRUE; @D.R0uM  
   KeyCount++; Nb^zkg  
   break; , aRJ!AZ  
  } K^!e-Xi6  
 } |@o]X?^  
 return bAdded; Ee t+  
} "C$!mdr7  
R$!;J?SS  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) q|47;bK'  
{ xZ9}8*Q&:  
 BOOL bRemoved=FALSE; gFWEodx,9  
 for(int index=0;index<MAX_KEY;index++){ }S~ysQwT  
  if(hCallWnd[index]==hWnd){ 88tFB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ s T :tFK\  
    hCallWnd[index]=NULL; ^7ea6G"  
    HotKey[index]=0; |d/x~t=  
    HotKeyMask[index]=0; YLA557~  
    bRemoved=TRUE; LyJTK1]#  
    KeyCount--; D,}'E0  
    break; Vq\..!y  
   } 3<zTkI  
  } Ckl7rpY+  
 } 5UrXVdP  
 return bRemoved; Ie^Dn!0S  
} G*vpf~q?  
 Vq .!(x  
void VerifyWindow() 1WUFk?p  
{ bMqu5G_q  
 for(int i=0;i<MAX_KEY;i++){ @n~>j&Kp  
  if(hCallWnd!=NULL){ Y2=Brtc[@  
   if(!IsWindow(hCallWnd)){ eB<V%,%N#  
    hCallWnd=NULL; !_XU^A>  
    HotKey=0; dPH! V6r  
    HotKeyMask=0; Kh:#S|   
    KeyCount--; fcE/  
   } [5RFQ!  
  } G!e}j @@  
 } N1s $3Ul  
} x;ICV%g/  
7kX7\[zN  
BOOL CHookApp::InitInstance() 9?g]qy,1)  
{ v' 9(et  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7?Qt2tr  
 hins=AfxGetInstanceHandle(); \c9t]py<.h  
 InitHotkey(); _M"$5 T  
 return CWinApp::InitInstance(); j?f,~Y<k  
} 282+1X  
RXx?/\~yd;  
int CHookApp::ExitInstance() w}U5dM`  
{ Cb@S </b  
 VerifyWindow(); 8JtI&aH-L  
 UnInit(); Wy^[4|6  
 return CWinApp::ExitInstance(); l|ZzG4]+l  
} WnJLX ^;  
ir@N>_  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file XftJ=  *  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +}(B856+  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3Q*RR"3  
#if _MSC_VER > 1000 l9ifUh e  
#pragma once ;8;~C "  
#endif // _MSC_VER > 1000 <_sT]?N #  
t0asW5f  
class CCaptureDlg : public CDialog 9$Pl'>5  
{ Yyo9{4v+p{  
 // Construction ,$6MM6W;-F  
 public: $ vw}p.  
  BOOL bTray; E9Xk8w'+  
  BOOL bRegistered; :WfB!4%!  
  BOOL RegisterHotkey(); e@2Vn? 5  
  UCHAR cKey; l6`d48U  
  UCHAR cMask; y`B!6p 5j  
  void DeleteIcon(); YAC zznN  
  void AddIcon(); ' ! UF&  
  UINT nCount; 0m+5Zn  
  void SaveBmp(); L$TKO,T  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 1[gjb((  
  // Dialog Data L$u&~"z-  
  //{{AFX_DATA(CCaptureDlg) 5k%N<e` `  
  enum { IDD = IDD_CAPTURE_DIALOG }; [-Dgo1}Qr  
  CComboBox m_Key; }'.Sn{OWf  
  BOOL m_bControl; 3Ibt'$dK  
  BOOL m_bAlt; Ay"2W%([`  
  BOOL m_bShift; _@~kYz  
  CString m_Path; |7'yk__m  
  CString m_Number; F{H0 %  
  //}}AFX_DATA P!6e  
  // ClassWizard generated virtual function overrides R:IS4AaS  
  //{{AFX_VIRTUAL(CCaptureDlg) Q RmQ>  
 public: 9y|&T  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !K^kKP*l  
 protected: ^SSOh#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _F|_C5A  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); w6In{uO-Z  
  //}}AFX_VIRTUAL mKFHT  
  // Implementation ]BQWA  
 protected: Lc:SqF  
  HICON m_hIcon; &CeF^   
  // Generated message map functions q;a*gqt   
  //{{AFX_MSG(CCaptureDlg) AGJ=de.  
  virtual BOOL OnInitDialog(); ) Q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); q(PT'z  
  afx_msg void OnPaint(); teS0F  
  afx_msg HCURSOR OnQueryDragIcon(); wR<QeH'V  
  virtual void OnCancel(); y:[VRLo  
  afx_msg void OnAbout(); fJ"~XTN}T  
  afx_msg void OnBrowse(); `J ,~hK  
  afx_msg void OnChange(); w4MMo  
 //}}AFX_MSG ~CdseSo 9  
 DECLARE_MESSAGE_MAP() ND9>`I 5  
}; A&lgiR*ObT  
#endif 1> @|  
[qD<U%Hi  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {_X1&&>8/  
#include "stdafx.h" E29gnYxu8  
#include "Capture.h" KRR^?  
#include "CaptureDlg.h" u-M$45vct  
#include <windowsx.h> 7 }MJK)  
#pragma comment(lib,"hook.lib") "JLhOTPaHf  
#ifdef _DEBUG yY-t4WeXP  
#define new DEBUG_NEW GGQ(|?w  
#undef THIS_FILE lGHu@(n<  
static char THIS_FILE[] = __FILE__; *7fPp8k+Z;  
#endif %TTL^@1!b  
#define IDM_SHELL WM_USER+1 [ma#8p)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pW^ ?g|_}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1z@# 8_@  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #\ S$$gP  
class CAboutDlg : public CDialog x7kg_`\U  
{ ~0r.3KTl"Y  
 public: ;OCI.S8  
  CAboutDlg(); -j=&J8Za  
  // Dialog Data Jas|P}{=fT  
  //{{AFX_DATA(CAboutDlg) x|i3e& D  
  enum { IDD = IDD_ABOUTBOX }; 0uJzff!|  
  //}}AFX_DATA d47:2Zj  
  // ClassWizard generated virtual function overrides B|$13dHfa  
  //{{AFX_VIRTUAL(CAboutDlg) ,u^0V"hJ  
 protected: '{k Nbx51  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [QN7+#K,  
  //}}AFX_VIRTUAL 8 ]MzOGB8  
  // Implementation R*{?4NKG  
 protected: JG4*B|3  
  //{{AFX_MSG(CAboutDlg) ^(JbJ@m/  
  //}}AFX_MSG E0A|+P '?  
  DECLARE_MESSAGE_MAP() s /q5o@b{  
}; 7b%Cl   
LU7)F,ok  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) f\r4[gU@  
{ ;fME4Sp  
 //{{AFX_DATA_INIT(CAboutDlg) +Q]'kJ<s  
 //}}AFX_DATA_INIT D2 cIVx3:(  
} f>/ 1KV  
dq/?&X  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6|qvo+%  
{ z\d2T%^:g(  
 CDialog::DoDataExchange(pDX); \'=}kk`  
 //{{AFX_DATA_MAP(CAboutDlg) Ngc+<  
 //}}AFX_DATA_MAP "{"2h>o#D}  
} NKhR%H  
(NN14  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) oYErG] ,  
 //{{AFX_MSG_MAP(CAboutDlg) }lpm Hvs  
 // No message handlers KrG6z#)Uz  
 //}}AFX_MSG_MAP !:[n3.vm   
END_MESSAGE_MAP() =>%%]0  
<7] Y\{+  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 3CPOZZ  
: CDialog(CCaptureDlg::IDD, pParent) 7[0k5-  
{ % peb{i  
 //{{AFX_DATA_INIT(CCaptureDlg) nKkTnTSa  
  m_bControl = FALSE; z9O/MHT[w  
  m_bAlt = FALSE; 9<CUsq@i:  
  m_bShift = FALSE; EXzNehO~e  
  m_Path = _T("c:\\"); [4rMUS7-m"  
  m_Number = _T("0 picture captured."); K05Y;URbd  
  nCount=0; e`1s[ ^B  
  bRegistered=FALSE; nqJV1h  
  bTray=FALSE; "FvlZRfXj  
 //}}AFX_DATA_INIT bY$! "b~  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {;M/J  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); <r3n?w8  
} ulo7d1OVkJ  
k T>}(G||  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _'p;V[(+M  
{ gdNp2b  
 CDialog::DoDataExchange(pDX); Lf M(DK  
 //{{AFX_DATA_MAP(CCaptureDlg) ;#yz i2f  
  DDX_Control(pDX, IDC_KEY, m_Key); )!-'SH  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $m oa8  
  DDX_Check(pDX, IDC_ALT, m_bAlt); P"@^'yR5WK  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Mg/2 w  
  DDX_Text(pDX, IDC_PATH, m_Path); u5M{s;{11r  
  DDX_Text(pDX, IDC_NUMBER, m_Number); PQ]N>'v-  
 //}}AFX_DATA_MAP 4 jro4B`  
} lf# six  
(oEA)yc|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !Sh5o'D28  
//{{AFX_MSG_MAP(CCaptureDlg) h1)\.F4G  
 ON_WM_SYSCOMMAND() h9nCSj  
 ON_WM_PAINT() =K8h)B_g  
 ON_WM_QUERYDRAGICON() ka%pS  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) n\9*B##  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1bs95Fh9Q  
 ON_BN_CLICKED(ID_CHANGE, OnChange) x%&V!L  
//}}AFX_MSG_MAP K\Q 1/})  
END_MESSAGE_MAP() 5L#M7E  
a9-;8`fCR  
BOOL CCaptureDlg::OnInitDialog() Big-)7?  
{ r'?&VS-Cj  
 CDialog::OnInitDialog(); M - TK  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); m#'9)%t!J  
 ASSERT(IDM_ABOUTBOX < 0xF000); v*v&f!Ym&s  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ~VF,qspO  
 if (pSysMenu != NULL) ?GZs5CnS  
 {  I9 m  
  CString strAboutMenu; $=R\3:j  
  strAboutMenu.LoadString(IDS_ABOUTBOX); / KM+PeO  
  if (!strAboutMenu.IsEmpty()) SfT]C~#$N  
  { YN[D^;}  
   pSysMenu->AppendMenu(MF_SEPARATOR); rt z(Jt{<  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "p\KePc;@  
  } ,3u19>2  
 } u e~1144  
 SetIcon(m_hIcon, TRUE); // Set big icon `mVH94{+I  
 SetIcon(m_hIcon, FALSE); // Set small icon UqbE  
 m_Key.SetCurSel(0); 3kg+*]tLx  
 RegisterHotkey(); 9'M({/7y  
 CMenu* pMenu=GetSystemMenu(FALSE); wB{-]\H`\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); isqW?$s  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); i8F~$6C  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); o? =u#=  
 return TRUE; // return TRUE unless you set the focus to a control 6 ?cV1:jh  
} [gDvAtTZ5  
ZN^Q!v  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Y&?]t  
{ i7_BnJJX{B  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) GS@ wG  
 { ?(N(8)G1  
  CAboutDlg dlgAbout; JaEyVe  
  dlgAbout.DoModal(); N?p $-{  
 } iC">F.9#  
 else 5k@ k  
 { UNJ|J$T]  
  CDialog::OnSysCommand(nID, lParam); .KV?;{~q@  
 } ;lldxS  
} 2C>PxA6l  
&o(? }W  
void CCaptureDlg::OnPaint() ZtiOf}@i\  
{ 99x]DY  
 if (IsIconic()) _IGQ<U<z  
 { (fl2?d5+C  
  CPaintDC dc(this); // device context for painting . 2WZb_ B  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /D~:Ufw  
  // Center icon in client rectangle RV~w+%f  
  int cxIcon = GetSystemMetrics(SM_CXICON); U i;o/Z3  
  int cyIcon = GetSystemMetrics(SM_CYICON); Q"\[ICu!,  
  CRect rect; 'RhMzPmY>  
  GetClientRect(&rect); !&X}? NK  
  int x = (rect.Width() - cxIcon + 1) / 2; Sx}h$E:  
  int y = (rect.Height() - cyIcon + 1) / 2; w% M0Mu  
  // Draw the icon [}Nfs3IlBw  
  dc.DrawIcon(x, y, m_hIcon); *+iWB_  
 } |tmD`ndO  
 else b`IC)xN$  
 { = hpX2/]  
  CDialog::OnPaint(); *fx<>aK  
 } b'G4KNW  
} N$. ''D?7D  
15870xS  
HCURSOR CCaptureDlg::OnQueryDragIcon() h/X),aK3  
{ b"J(u|Du`  
 return (HCURSOR) m_hIcon; a/_ `1  
} 7oUYRqd  
^0VI J)y  
void CCaptureDlg::OnCancel() ]wP)!UZ  
{ 3)=$BSC%  
 if(bTray) r"xo9&|  
  DeleteIcon(); >:s:`Au  
  CDialog::OnCancel(); qsJo)SA  
} upWq=_  
>kd2GZe^_J  
void CCaptureDlg::OnAbout() %H:!/'45  
{ ,cS|fG  
 CAboutDlg dlg; J^u8d?>r  
 dlg.DoModal(); M6?*\ 9E  
} K'y;j~`-  
K2!KMhvQ  
void CCaptureDlg::OnBrowse() l( "_JI  
{ I'C{=?  
 CString str; 7D4P= $UJp  
 BROWSEINFO bi; 2mI=V.X[&  
 char name[MAX_PATH]; ~v2_vEu}JX  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); q[r|p"TGov  
 bi.hwndOwner=GetSafeHwnd(); /mvuSNk  
 bi.pszDisplayName=name; H!,#Z7s  
 bi.lpszTitle="Select folder"; IGVNX2  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ppS,9e-  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 8J Gt|,  
 if(idl==NULL) U$qSMkj6RK  
  return; n pBpYtG  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \9!W^i[+  
 str.ReleaseBuffer(); fk9FR^u  
 m_Path=str; 5PG%)xff*  
 if(str.GetAt(str.GetLength()-1)!='\\') u3Ua>A-  
  m_Path+="\\"; kE=}.  
 UpdateData(FALSE); ?> }bg  
} kpcIU7|e  
](:aDHa  
void CCaptureDlg::SaveBmp() 2BEF8o]Np  
{ &ciU`//`  
 CDC dc; eXUXoK=T  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); jCxw|tmgq  
 CBitmap bm; V`=#j[gX)=  
 int Width=GetSystemMetrics(SM_CXSCREEN); cOq^}Ohan  
 int Height=GetSystemMetrics(SM_CYSCREEN); {!@Pho)Q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Xh;Pbm|K  
 CDC tdc; \5cAOBja  
 tdc.CreateCompatibleDC(&dc); y#o ,Vg*V  
 CBitmap*pOld=tdc.SelectObject(&bm); 8" XbW7^o  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); (pNA8i%=G  
 tdc.SelectObject(pOld); Q >] v?4  
 BITMAP btm; LS*^TA(I[  
 bm.GetBitmap(&btm); 1@im+R?a  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; aj85vON1`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9;NR   
 BITMAPINFOHEADER bih; \E5%.KR  
 bih.biBitCount=btm.bmBitsPixel; 7g[T#B'/x,  
 bih.biClrImportant=0; HI*xk  
 bih.biClrUsed=0; G$<FQDvs  
 bih.biCompression=0; ]^uO3!+  
 bih.biHeight=btm.bmHeight; :D`ghXj  
 bih.biPlanes=1; 9K-=2hvv  
 bih.biSize=sizeof(BITMAPINFOHEADER); 615, P/  
 bih.biSizeImage=size; J*IC&jH:  
 bih.biWidth=btm.bmWidth; )<nr;n  
 bih.biXPelsPerMeter=0; < {$zOF}  
 bih.biYPelsPerMeter=0; 1-!u=]JDE  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); > r6`bh [4  
 static int filecount=0; UEbRg =6  
 CString name; ?kMG!stgp}  
 name.Format("pict%04d.bmp",filecount++); 7g^=   
 name=m_Path+name; c$ya{]a  
 BITMAPFILEHEADER bfh; +}@1X&v:  
 bfh.bfReserved1=bfh.bfReserved2=0; I4.^I/c(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); r~N0P|Tq  
 bfh.bfSize=54+size; zc%#7"FM  
 bfh.bfOffBits=54; *_ {w0U)  
 CFile bf; apPn>\O  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ }D-h=,];  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); x<W`2Du  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); rf?Q# KM\W  
  bf.WriteHuge(lpData,size); jl YnV/ ]  
  bf.Close(); F?TxViL  
  nCount++; C%}}~Y  
 } ?]+{2&&$  
 GlobalFreePtr(lpData); *J&XM[t  
 if(nCount==1) g&I/b/A  
  m_Number.Format("%d picture captured.",nCount); 1$vsw  
 else fS+Ga1CsH  
  m_Number.Format("%d pictures captured.",nCount); 3eX;T +|o  
  UpdateData(FALSE); ~Q}JC3f>  
} Pi7vuOJr8  
?4vf 2n@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xO"fg9a  
{ P0WI QG+  
 if(pMsg -> message == WM_KEYDOWN) N'[bA  
 { |d =1|C%,  
  if(pMsg -> wParam == VK_ESCAPE) /<,LM8n  
   return TRUE; x@/ N9*  
  if(pMsg -> wParam == VK_RETURN) Vf<VKP[9K  
   return TRUE; huVw+vAA  
 } y8=p;7DY  
 return CDialog::PreTranslateMessage(pMsg); Wm!lWQu7  
} szW_cjS  
zG)XB*c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) KKpO<TO  
{ e%. Xya#\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ rK 9  
  SaveBmp(); C":i56  
  return FALSE; owHV&(Go(B  
} lYEMrr!KQw  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ v|r\kr k  
 CMenu pop; qOOF]L9r%u  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); GPP{"6q5'  
 CMenu*pMenu=pop.GetSubMenu(0); <Th) &  
 pMenu->SetDefaultItem(ID_EXITICON); ~gU.z6us  
 CPoint pt; n/*BK;  
 GetCursorPos(&pt); F|.,lb |L  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .u[hK  
 if(id==ID_EXITICON) 6;"^Id  
  DeleteIcon(); fNjxdG{a  
 else if(id==ID_EXIT) 8/lv,m#  
  OnCancel(); +|6 '7Z(9  
 return FALSE; EAiE@r>4  
} /O@'XWW  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); oS3}xT" U  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) bMWL^*I  
 AddIcon(); AL*P 2\8  
 return res; Z(g9rz']0  
} o&M2POI~q  
MR8\'0]  
void CCaptureDlg::AddIcon() pbg[\UJyd  
{ }<?1\k  
 NOTIFYICONDATA data; .-Y3oWV  
 data.cbSize=sizeof(NOTIFYICONDATA); xDtq@Rb}  
 CString tip; "{a-I=s\C  
 tip.LoadString(IDS_ICONTIP); g )H>Uu5@  
 data.hIcon=GetIcon(0); 0}'  
 data.hWnd=GetSafeHwnd(); +)8,$1[p|  
 strcpy(data.szTip,tip); YbS$D  
 data.uCallbackMessage=IDM_SHELL; 2 de[ yz  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; F3k]*pk8w  
 data.uID=98; BN!N_r  
 Shell_NotifyIcon(NIM_ADD,&data); p4} ,xQzB  
 ShowWindow(SW_HIDE); "r@f&Ssxb  
 bTray=TRUE; w.s-T.5.j  
} a`SQcNBf*  
{O\>"2}m'f  
void CCaptureDlg::DeleteIcon() +RIG8w]  
{ ;Y:_}kN8_  
 NOTIFYICONDATA data; wPhN_XV  
 data.cbSize=sizeof(NOTIFYICONDATA); 9OIX5$,S;  
 data.hWnd=GetSafeHwnd(); b-sbRR  
 data.uID=98; z\iz6-\&y  
 Shell_NotifyIcon(NIM_DELETE,&data); vfb~S~|U6g  
 ShowWindow(SW_SHOW); Z7 \gj`  
 SetForegroundWindow(); n,KOQI;  
 ShowWindow(SW_SHOWNORMAL); 7D5;lM[_  
 bTray=FALSE; H)XHlO^  
} ^Y mq<*X  
%;5AF8#c  
void CCaptureDlg::OnChange() 8)(<U/  
{ t- Rp_2t  
 RegisterHotkey(); NZUQ R`5  
} hAHZN^x&  
Z<j(ZVO  
BOOL CCaptureDlg::RegisterHotkey() b"`Vn,  
{ 6.]x@=Wm  
 UpdateData(); `1I@tz|  
 UCHAR mask=0; d'1 L#`?  
 UCHAR key=0; Z1V%pg>]*  
 if(m_bControl) &r0b~RwUv  
  mask|=4; eURy]  
 if(m_bAlt) 5o2W[<%v  
  mask|=2; m%8idjnG  
 if(m_bShift) CuE>=y- "I  
  mask|=1; x)'4u6;d  
  key=Key_Table[m_Key.GetCurSel()]; yn;h.m[):  
 if(bRegistered){ aOWE\I c8  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); _O!)aD  
  bRegistered=FALSE; y1DP`Ro  
 } #N`~. 96  
 cMask=mask; NL})_.Og  
 cKey=key; & w{""'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D;@*  
 return bRegistered; &"bcI7uGT  
} 'B;aXy/JC  
CTu#KJ?j  
  四、小结 U1&pcwP  
7%aaqQ1T  
  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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