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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: 2hjre3"?  
  .6lY*LI  
  一、实现方法 Y&ct+w]%  
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  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: u5  [1Z|O  
?^+#pcX]t|  
#pragma data_seg("shareddata") /\IAr,w[  
HHOOK hHook =NULL; //钩子句柄 x!Z:K5%O  
UINT nHookCount =0; //挂接的程序数目 F{a0X0ru~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 GC5#1+fQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 U89]?^|bb  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :F!dTD$  
static int KeyCount =0; 8:3oH!n  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 YyQf  
#pragma data_seg() d/ 'A\"o+  
3&drof\{  
  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。 g]EQ2g_N1  
6xDl=*&%  
  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: EOd.Tyb!/  
*IMF4 x5M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Pj1K  
cKey,UCHAR cMask) =]5DYRhX]  
{ y]~+`9  
 BOOL bAdded=FALSE; S0Rf>Eo4  
 for(int index=0;index<MAX_KEY;index++){ 7?n* t  
  if(hCallWnd[index]==0){ (hRgYwUa<  
   hCallWnd[index]=hWnd; 89:?.'  
   HotKey[index]=cKey; mVc'%cPaw  
   HotKeyMask[index]=cMask; e)ZyTuj  
   bAdded=TRUE; } kh/mq  
   KeyCount++; +O.&64(  
   break; S*2L4Uj`|  
  } 9TbS>o  
 } 9H !B)  
 return bAdded; dw{#||  
} SoXX}<~E4  
//删除热键 ~P"!DaAf  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <{-(\>f!9  
{ cpr{b8Xb8&  
 BOOL bRemoved=FALSE; tF;& x g  
 for(int index=0;index<MAX_KEY;index++){ ,oBk>  
  if(hCallWnd[index]==hWnd){ 6N)< o ;U  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ aPY>fy^8D  
    hCallWnd[index]=NULL; 82Z[eo  
    HotKey[index]=0; E,ZB;  
    HotKeyMask[index]=0; V1CSXY\2  
    bRemoved=TRUE; M<M# < kD  
    KeyCount--; A .jp<>  
    break; \gJapx(  
   } Xn ZX *Y]"  
  } 7(+OsE  
 } e GqvnNv  
 return bRemoved; pjmGzK  
} }LHT#{+ x  
&bS"N)je  
@gu77^='  
  DLL中的钩子函数如下: }jyS\drJ  
(to/9OrG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0$F _hZU  
{ =Nv= Q mO  
 BOOL bProcessed=FALSE; +,{Wcb  
 if(HC_ACTION==nCode) 98b9%Z'2f  
 { Z+`{JE#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ZB_16&2Ow  
   switch(wParam) **w*hd]  
   {  WO+?gu  
    case VK_MENU:  n_xa)  
     MaskBits&=~ALTBIT; <De3mZb  
     break; cciAMQhA  
    case VK_CONTROL: @3expC  
     MaskBits&=~CTRLBIT; !mErt2UJl  
     break; YjIED,eRv  
    case VK_SHIFT: :y O,  
     MaskBits&=~SHIFTBIT; `1[Sv"  
     break; sJHy=z0m  
    default: //judge the key and send message wk@(CKQzI,  
     break; yTq(x4]  
   } kj<D4)  
   for(int index=0;index<MAX_KEY;index++){ iEJQ#5))0  
    if(hCallWnd[index]==NULL) wCC~tuTpr  
     continue; :)+@qxTy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )kY _"= d  
    { 23u1nU[0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ffoo^1}1  
     bProcessed=TRUE; 4MF}FS2)  
    } b/n8UxA  
   } n[MIa]dK  
  } o,''f_tRQ|  
  else if((lParam&0xc000ffff)==1){ //有键按下 $jm>tW&;  
   switch(wParam) ^b|Nw:  
   { =Zb"T5E  
    case VK_MENU: $E9daUt8"J  
     MaskBits|=ALTBIT; jFPE>F7-M  
     break; }JpslY*aS  
    case VK_CONTROL: Edn$0D68u_  
     MaskBits|=CTRLBIT; hOrk^iYN=  
     break; + k(3+b$S-  
    case VK_SHIFT: ) R a/  
     MaskBits|=SHIFTBIT; ~a8G 5M  
     break; 5S-o 2a  
    default: //judge the key and send message Pguyf2/w  
     break; ixJ20A7  
   } +v[$lh+  
   for(int index=0;index<MAX_KEY;index++){ \Q?|gfJH  
    if(hCallWnd[index]==NULL) HBga'xJ  
     continue; i37a}.;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &"j).Ogm4  
    { <cfH '~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); J!K/7u S  
     bProcessed=TRUE; W1vAK  
    } XpAq=p0;  
   } Z\gg<Q  
  } \,cKt_{ u  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Cp~3Jm3  
   for(int index=0;index<MAX_KEY;index++){ k.%W8C<Pa  
    if(hCallWnd[index]==NULL) o YI=p3l  
     continue; hZ\W ?r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @tv];t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %_@5_S  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 <1 1Tqb  
   } 5t5S{aCDr  
  } feq6!k7  
 } 3_eml\CY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7Ae,|k  
} a^}P_hg}-  
&F*QYz[  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: +D-+}&oW  
w KMk|y>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); DEwtP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UG?C=Tf  
://# %SE  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: n\ ',F  
O\8|niW|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r5qx! >  
{ |KrG3-i3X  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ONe!'a0  
 { 6r-n6#=  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 <%#y^_  
  SaveBmp(); Dx# @D#  
  return FALSE; .fh?=B[o#  
 } 2:5gMt  
 …… //其它处理及默认处理 JO^ [@  
} Am?Hkh2  
}:D~yEP  
I~ ]mX;  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 e%c5 OZ3~  
bq&S?! =s  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 WKJL< D ]:  
Di"9 M(6vf  
  二、编程步骤 H|:)K^o  
R6$F<;nw  
  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"; ~q|e];tA  
4Hpu EV8Q  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; g!Yh=kA'N  
t7+Ic  
  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; U9[A(  
v*fc5"3eO  
  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; sCCr%r]zL  
1@z@  
  5、 添加代码,编译运行程序。 0t[mhmSU,  
mS&\m#s<  
三、程序代码 Wk6&TrWlY  
f=O>\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL L?C~ qS2g  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) $#JVI:  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ *]{I\rX  
#if _MSC_VER > 1000 78J .~v/  
#pragma once skx=w<YO6]  
#endif // _MSC_VER > 1000 RYJc>  
#ifndef __AFXWIN_H__ SVWSO  
#error include 'stdafx.h' before including this file for PCH L=w Fo^N  
#endif G/3lX^Z>  
#include "resource.h" // main symbols 54cgX)E[x  
class CHookApp : public CWinApp sH,)e'0  
{ {ZEXlNPww  
 public: V+~{a:8[pq  
  CHookApp(); iwjl--)@K  
  // Overrides 5qfKV&D  
  // ClassWizard generated virtual function overrides I%C:d#p  
  //{{AFX_VIRTUAL(CHookApp) Bo\v-97  
 public: ]sP9!hup  
  virtual BOOL InitInstance(); [#6Esy8|  
  virtual int ExitInstance(); F8;4Oj  
  //}}AFX_VIRTUAL EjE`S_i=  
  //{{AFX_MSG(CHookApp) XTaWd0Y  
  // NOTE - the ClassWizard will add and remove member functions here. !;C(pnE  
  // DO NOT EDIT what you see in these blocks of generated code ! R{A/ +7!  
  //}}AFX_MSG ,vw`YKg  
  DECLARE_MESSAGE_MAP() gL"Q.ybA  
}; #&KE_ n  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "(&`muIc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (Ha}xwA~(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c!wB'~MS#  
BOOL InitHotkey();  /r@  
BOOL UnInit(); YgOgYo{E!  
#endif L=!kDU  
6@ ^`-N;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. pYUkd!K"  
#include "stdafx.h" .+ o>  
#include "hook.h" S,v>*AF  
#include <windowsx.h> ,;pX.Ob U  
#ifdef _DEBUG V*uu:  
#define new DEBUG_NEW }4]x"DfIg  
#undef THIS_FILE `2,_"9Z(  
static char THIS_FILE[] = __FILE__; <U`Nb) &  
#endif %)ov,p |  
#define MAX_KEY 100 ~cj:AIF  
#define CTRLBIT 0x04 > 0)`uJ  
#define ALTBIT 0x02 Jd6Q9~z#  
#define SHIFTBIT 0x01 :?6$}GcW  
#pragma data_seg("shareddata") b=\3N3OX  
HHOOK hHook =NULL; n7.lF  
UINT nHookCount =0; Cy'W!qH  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey <%uZwk>#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT rWKLxK4oU  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey k\Tm?^L)  
static int KeyCount =0; `9{C/qB  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift .h^Ld,Chj  
#pragma data_seg() I19F\ L`4  
HINSTANCE hins; 2czL 1Ci  
void VerifyWindow(); usf(U>  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -vAG5x/,  
//{{AFX_MSG_MAP(CHookApp) ,.MG&O  
// NOTE - the ClassWizard will add and remove mapping macros here. 1RHH<c%2n  
// DO NOT EDIT what you see in these blocks of generated code! Xb 1^Oj  
//}}AFX_MSG_MAP #|E. y^IC  
END_MESSAGE_MAP() &scD)  
2;r^~:  
CHookApp::CHookApp() urjp&L&  
{ &Sp:?I-  
 // TODO: add construction code here, LOkDx2@g  
 // Place all significant initialization in InitInstance )X$n'E  
} =DwH*U /YR  
o;C)!  
CHookApp theApp; 3PeJPw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GQxJ (f  
{ 8so}^2hTlT  
 BOOL bProcessed=FALSE; _Fy:3,(  
 if(HC_ACTION==nCode) PP|xIAc  
 { $& gidz/w  
  if((lParam&0xc0000000)==0xc0000000){// Key up w`f~Ht{wYR  
   switch(wParam) !&%bl  
   { S]@iS[|?  
    case VK_MENU: [T|1Qq7  
     MaskBits&=~ALTBIT; )d Dmq  
     break; (:]iHg3  
    case VK_CONTROL: I65GUX#DV  
     MaskBits&=~CTRLBIT; f\w4F'^tj  
     break; -bQvJ`iF  
    case VK_SHIFT: cu|q &  
     MaskBits&=~SHIFTBIT; 'Q,<_ L"  
     break; 8Wp1L0$B  
    default: //judge the key and send message CMUphS-KE  
     break; nwH|Hs riU  
   } 1uzfV)  
   for(int index=0;index<MAX_KEY;index++){ sM[c\Z]  
    if(hCallWnd[index]==NULL) J1MnkxJmpQ  
     continue; #R| 4(HlL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b~echOj  
    { +Q&@2 oY"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1h{_v!X  
     bProcessed=TRUE; X)5O@"4 ?  
    } mz '8  
   } n&&y\?n  
  } ?id^v 7d  
  else if((lParam&0xc000ffff)==1){ //Key down ]TN}` ]  
   switch(wParam) Q&{5.}L  
   { uS.a9 Q(  
    case VK_MENU: 'iK*#b8l  
     MaskBits|=ALTBIT; JDlIf  
     break; u?/]"4  
    case VK_CONTROL: %&GQ]pmcY  
     MaskBits|=CTRLBIT; {.W%m  
     break; Fd'L:A~  
    case VK_SHIFT: <h0ptCB  
     MaskBits|=SHIFTBIT; %)]RM/e8  
     break; Rv o<ISp  
    default: //judge the key and send message )~kb 7rfl  
     break; qIp`'.#m  
   } EB,>k1IJ  
   for(int index=0;index<MAX_KEY;index++) Yb*}2  
   { Xu0*sQK  
    if(hCallWnd[index]==NULL) #y%Ao\~kG  
     continue; ,oe4*b}O=.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^jA}*YP  
    { RzRLrfV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \ 02e zG  
     bProcessed=TRUE; ~.tu#Y?  
    } K*[wr@)u  
   } ['j,S<Bu~  
  } oQO3:2a  
  if(!bProcessed){ dno*Usx5d0  
   for(int index=0;index<MAX_KEY;index++){ ,B><la87  
    if(hCallWnd[index]==NULL) Ho|n\7$  
     continue; iqYc&}k,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 54&2SU$kx  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6!N&,I  
   } hG]20n2  
  }  _>l,%n  
 } A 78{b^0*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zvWQ&?&o2  
} =?hlgQ  
#'oKkrl  
BOOL InitHotkey() [g_@<?zg  
{ 7)#/I  
 if(hHook!=NULL){ 4B]a8  
  nHookCount++; Zup?nP2GkT  
  return TRUE; - Zh+5;8g  
 } Qfi5fp=f  
 else lQjq6Fl2  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); @ck2j3J/  
  if(hHook!=NULL) 6dp~19T^  
   nHookCount++; j!/(9*\  
  return (hHook!=NULL); *lSIT]1  
} ;RI,zQ  
BOOL UnInit() e2Dj%=`EU  
{ (;3jmdJhK  
 if(nHookCount>1){ 1GxYuTZ{  
  nHookCount--; b04~z&Xv  
  return TRUE; B~IOM  
 } A{vG@Pwc:  
 BOOL unhooked = UnhookWindowsHookEx(hHook); E}u\{uY  
 if(unhooked==TRUE){ B#}RMFIj  
  nHookCount=0; s zg1.&  
  hHook=NULL; rO~D{)Nu  
 } WUWQcJj  
 return unhooked; FtXEudk  
} }e$);A|  
V RL6F2 >6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) '*:YC  
{ O%I'   
 BOOL bAdded=FALSE;  xMU)  
 for(int index=0;index<MAX_KEY;index++){ &!=3Fbn  
  if(hCallWnd[index]==0){ }m?L/Y'}  
   hCallWnd[index]=hWnd; &nYmVwi?"Q  
   HotKey[index]=cKey; y[vjqfdmU  
   HotKeyMask[index]=cMask; n3w2&  
   bAdded=TRUE; _)Ms9RN  
   KeyCount++; D~Su82 2  
   break; |(fWT}tg  
  } >=bO@)[  
 } li[g =A,  
 return bAdded; aw`mB,5U  
} 2iu;7/  
<fxYTd<#D[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^]kDYhe*Y  
{ +^.(3Aw  
 BOOL bRemoved=FALSE; 0M"E6z)9  
 for(int index=0;index<MAX_KEY;index++){ IlVi1`]w  
  if(hCallWnd[index]==hWnd){ 6S(3tvUr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ UcZ3v]$I  
    hCallWnd[index]=NULL; 'D bHXS7N  
    HotKey[index]=0; LQe<mZ<  
    HotKeyMask[index]=0; K;K tx>Z/  
    bRemoved=TRUE; _Z%C{~,7)x  
    KeyCount--; 8LL);"$  
    break; wR KGJ  
   } +W}f0@#)<  
  } l\eq/yg_  
 } lUrchLoDt  
 return bRemoved; rRMC< .=  
} vDemY"wz  
S=o/n4@}  
void VerifyWindow() E5rNC/Ul$$  
{ pD{Li\LY  
 for(int i=0;i<MAX_KEY;i++){ 1+]e?  
  if(hCallWnd!=NULL){ B:l(`G  
   if(!IsWindow(hCallWnd)){ @"6BvGU2s  
    hCallWnd=NULL; z')'8155  
    HotKey=0; pq@ad\8  
    HotKeyMask=0; opBv x>S  
    KeyCount--; Gr_I/+<  
   } QeK~A@|F&  
  } jooh`| `P  
 } X,p&S^  
} w/R^Vwq  
Uc&0>_Z  
BOOL CHookApp::InitInstance() #M:W?&.  
{ ^E9@L ??  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); :Q%&:[2  
 hins=AfxGetInstanceHandle(); mU*GcWbc+  
 InitHotkey(); ? in&/ZrB  
 return CWinApp::InitInstance(); e= '3gzz  
} a*=e 3nS  
,}NG@JID  
int CHookApp::ExitInstance() k;%}%"EVZ  
{ q+N}AKawB  
 VerifyWindow(); = zsXa=<  
 UnInit(); Ws=J)2q  
 return CWinApp::ExitInstance();  Z/64E^  
} (T@ov~ @  
te1lUQ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file A2B&X}K|U  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8!1o,=I$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ % R'eV<  
#if _MSC_VER > 1000 3vy5JTCz~  
#pragma once %j=7e@   
#endif // _MSC_VER > 1000 _onHe"%{  
ALFw[1X  
class CCaptureDlg : public CDialog <#c2Hg%jh  
{ 0^;{b^!(  
 // Construction fUa`Y ryQ  
 public: XVY^m}pMe  
  BOOL bTray; w^r*qi"  
  BOOL bRegistered; zFOX%q  
  BOOL RegisterHotkey(); ?&?y-&.5-  
  UCHAR cKey; ]^s4NXf+  
  UCHAR cMask; y&iLhd!p  
  void DeleteIcon();  X'0A"9  
  void AddIcon(); >~6 ;9{@  
  UINT nCount; <{'':/tXI  
  void SaveBmp(); BYu|loc  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y yI|^f8C  
  // Dialog Data BKN]DxJ6  
  //{{AFX_DATA(CCaptureDlg) %bddR;c  
  enum { IDD = IDD_CAPTURE_DIALOG }; &vLZj  
  CComboBox m_Key; Jg7IGU(dct  
  BOOL m_bControl; ,Qp58u2V  
  BOOL m_bAlt; m'%F,c)  
  BOOL m_bShift; ;R/=9l  
  CString m_Path; nuvz!<5\{  
  CString m_Number; Z#9{1sHEP  
  //}}AFX_DATA WC`<N4g|  
  // ClassWizard generated virtual function overrides o'W &gkb9  
  //{{AFX_VIRTUAL(CCaptureDlg) @#sQ7eMoy  
 public: keX0br7u_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); \&SP7~-eq  
 protected: M5D,YC3<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *@n%K,$v  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); K~[/n<ks  
  //}}AFX_VIRTUAL Qg3 -%i/@  
  // Implementation <n0-zCf  
 protected: }Za[<t BWS  
  HICON m_hIcon; 3wD6,x-e   
  // Generated message map functions c!s{QWd%  
  //{{AFX_MSG(CCaptureDlg) .sCo,  
  virtual BOOL OnInitDialog(); N!hp^V<7  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); t0?\5q  
  afx_msg void OnPaint(); .NZ_dz$c  
  afx_msg HCURSOR OnQueryDragIcon(); eGZId v1  
  virtual void OnCancel(); n}a# b%e  
  afx_msg void OnAbout(); (xq25;|Y  
  afx_msg void OnBrowse(); YckexfL  
  afx_msg void OnChange(); d!,V"*S  
 //}}AFX_MSG l'c|I &Y]  
 DECLARE_MESSAGE_MAP() V<+d o|@F  
}; ([s2F%S`@  
#endif $lUZm\R|k  
lxV> rmD  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +>{{91mN  
#include "stdafx.h" ,OG sx  
#include "Capture.h" AM\`v'I*6  
#include "CaptureDlg.h" 1Hzj-u&N/  
#include <windowsx.h> <` HLG2  
#pragma comment(lib,"hook.lib") 'j>Q7M7q{  
#ifdef _DEBUG )0!hw|0|  
#define new DEBUG_NEW _bFX(~37z?  
#undef THIS_FILE i |cSO2O+  
static char THIS_FILE[] = __FILE__; XYf;72*  
#endif ?f:FmgQk  
#define IDM_SHELL WM_USER+1 _^Rf*G!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vfmKYiLp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E+csK*A7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; . [*6W.X  
class CAboutDlg : public CDialog i yMIP~N,$  
{ ."cC^og  
 public: lZ'NL bK  
  CAboutDlg(); ,f4Hl%T;  
  // Dialog Data e>X&[\T  
  //{{AFX_DATA(CAboutDlg) y1FS?hSD0  
  enum { IDD = IDD_ABOUTBOX }; e~jp< 4  
  //}}AFX_DATA 4,UvTw*2z  
  // ClassWizard generated virtual function overrides Bz]j&`  
  //{{AFX_VIRTUAL(CAboutDlg) 9qW^@5 m  
 protected: ^\J/l\n  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support yn"8Ma*  
  //}}AFX_VIRTUAL eCdMDSFO3  
  // Implementation 3<#4  
 protected: ;IE|XR(  
  //{{AFX_MSG(CAboutDlg) NmVc2V]I  
  //}}AFX_MSG UjUDP>iz.>  
  DECLARE_MESSAGE_MAP() R 8?Xz5  
}; NgQ {'H[Y  
OV^) N  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t d-EB&i\  
{ V]<J^m8  
 //{{AFX_DATA_INIT(CAboutDlg) @<r  ;>G  
 //}}AFX_DATA_INIT L:j;;9Sp{  
}  E*i <P  
^DM^HSm  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9Iy>oV  
{ h{qB\aK  
 CDialog::DoDataExchange(pDX); l '<gkwX  
 //{{AFX_DATA_MAP(CAboutDlg) @'jC>BS8`  
 //}}AFX_DATA_MAP !Zlvz%X  
} ;y Wfb|!  
){ArZjG>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [$ vAjP  
 //{{AFX_MSG_MAP(CAboutDlg) ESL(Mf'  
 // No message handlers V1,O7m+F2  
 //}}AFX_MSG_MAP I~gU3(  
END_MESSAGE_MAP() 7J.alV4`/  
vSX71  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) TlQu+w|  
: CDialog(CCaptureDlg::IDD, pParent) Si.3Je[q  
{ d>VerZZU  
 //{{AFX_DATA_INIT(CCaptureDlg) ,FlF.pt  
  m_bControl = FALSE; #iJ+}EW _  
  m_bAlt = FALSE; "~> # ;x{  
  m_bShift = FALSE; XN'x`%!*3#  
  m_Path = _T("c:\\"); P0Z1cN}  
  m_Number = _T("0 picture captured."); wRCGfILw  
  nCount=0; Ox Zw;yD  
  bRegistered=FALSE; &Vd,{JU  
  bTray=FALSE; /:~mRf^  
 //}}AFX_DATA_INIT _r^Cu.[7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 y?zNxk/p  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :?O+EE  
} 2aNCcZw0  
37Q9goMov  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $2~I-[  
{ f4@>7K]9TA  
 CDialog::DoDataExchange(pDX); 0V }knR.l  
 //{{AFX_DATA_MAP(CCaptureDlg) 'x$>h)t]  
  DDX_Control(pDX, IDC_KEY, m_Key); >T'^&l(:  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); CuR.a  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9|jk=`4UK  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Z ^zUb  
  DDX_Text(pDX, IDC_PATH, m_Path); 9~J  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3){ /u$iH.  
 //}}AFX_DATA_MAP Xb@lKX5Re  
} )#%k/4(Y  
/{gCf  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /4}{SE  
//{{AFX_MSG_MAP(CCaptureDlg) 07:CcT  
 ON_WM_SYSCOMMAND() oj/,vO:QT  
 ON_WM_PAINT() _VFl.U,   
 ON_WM_QUERYDRAGICON() 0O5(\8jM  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $DuX1T  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4 Z.G  
 ON_BN_CLICKED(ID_CHANGE, OnChange) tF}Vs}  
//}}AFX_MSG_MAP c!{v/zOz  
END_MESSAGE_MAP() ROw9l!YF  
Vcm9:,Xlw  
BOOL CCaptureDlg::OnInitDialog() X~(%Y#6  
{ 3C=ON.1eg  
 CDialog::OnInitDialog(); ~G+o;N,V  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); vN=e1\  
 ASSERT(IDM_ABOUTBOX < 0xF000); p~vq1D6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 5xtIez]x?  
 if (pSysMenu != NULL) zZ@]Kq;.s  
 { 2y s'q !  
  CString strAboutMenu; By%mJ%$~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); WqlX'tA  
  if (!strAboutMenu.IsEmpty())  ky0Fm W  
  { J5b>mTvb  
   pSysMenu->AppendMenu(MF_SEPARATOR); ;'CWAJK  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Ou/JN+2A  
  } //9Ro"  
 } EdbL AagI6  
 SetIcon(m_hIcon, TRUE); // Set big icon ;4tmnC>OnA  
 SetIcon(m_hIcon, FALSE); // Set small icon M@ t,P?  
 m_Key.SetCurSel(0); > 1 {V  
 RegisterHotkey(); B! $a Y  
 CMenu* pMenu=GetSystemMenu(FALSE); 8VxjC1v+  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); r\-Mj\$-  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); KjFNb;mM  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2mg4*Ys  
 return TRUE; // return TRUE unless you set the focus to a control U>PF#@ C/  
} vs]#?3+  
O{:_-eI&d  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) O4H %x  
{ MY1s  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) a7KP_[_(  
 { qw={gZ  
  CAboutDlg dlgAbout; cyu)YxT  
  dlgAbout.DoModal(); Z:7X=t =  
 } YaI8hj@}  
 else Ry2rQM`  
 { f-!t31?XK  
  CDialog::OnSysCommand(nID, lParam); 7UM!<@9\  
 } WtlPgT;wE  
} ;[9WB<t  
l8rBp87Q  
void CCaptureDlg::OnPaint() 'Pyeb`AXE9  
{ X-[_g!pV  
 if (IsIconic()) U,q ]  
 { "9mJ$us  
  CPaintDC dc(this); // device context for painting gwHNz5 a*V  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); TNs ;#Q  
  // Center icon in client rectangle }$EcNm$%  
  int cxIcon = GetSystemMetrics(SM_CXICON); vd+yU9  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?+EN.P[;3  
  CRect rect; eTVI.B@p  
  GetClientRect(&rect); G4DuqN~2m  
  int x = (rect.Width() - cxIcon + 1) / 2; sY,q*}SLD  
  int y = (rect.Height() - cyIcon + 1) / 2; )xtDiDB  
  // Draw the icon |_7nvck  
  dc.DrawIcon(x, y, m_hIcon); iX ;E"ov]  
 } Eo)w f=rE9  
 else Ck<g0o6  
 { mqPV Eo  
  CDialog::OnPaint(); e}e|??'(\  
 } E07g^y"}i  
} g_{hB5N](7  
U)mg]o-VE  
HCURSOR CCaptureDlg::OnQueryDragIcon() cEzWIS?pp\  
{ HivmKn`  
 return (HCURSOR) m_hIcon; 1QkAFSl3  
} s+m,ASj  
^3`CP4DT  
void CCaptureDlg::OnCancel() m#y?k1GY  
{ 7/^`y')  
 if(bTray) 5@_c<   
  DeleteIcon(); 5<1,`Bq@  
  CDialog::OnCancel(); =+@IpXj  
} 5 \1C@d  
B1\@ n$  
void CCaptureDlg::OnAbout() @#sBom+K`  
{ |4RuT .-o  
 CAboutDlg dlg; (W.euQy  
 dlg.DoModal(); |%6zhkoufM  
} h ]'VAt  
CH h]v.V  
void CCaptureDlg::OnBrowse() Ga o(3Y  
{ &Uqm3z?v  
 CString str; P\#z[TuHKC  
 BROWSEINFO bi; ){=2td$=$  
 char name[MAX_PATH]; Q)pm3Wi  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Gp6|0:2,L~  
 bi.hwndOwner=GetSafeHwnd(); NUB3L  
 bi.pszDisplayName=name; yj]\%3o<Z7  
 bi.lpszTitle="Select folder"; c o}o$}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4.@gV/U(|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); I^'U_"vB  
 if(idl==NULL) >we/#C"x  
  return; [Tv!Pc  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8!e1T,:b  
 str.ReleaseBuffer(); 3)SO-Bz\  
 m_Path=str; JStT"*4j  
 if(str.GetAt(str.GetLength()-1)!='\\') X8U._/'N  
  m_Path+="\\"; i7^_y3dG  
 UpdateData(FALSE); 7=jeq|&kN  
} +jk_tPSe  
n[2[V*|mI  
void CCaptureDlg::SaveBmp() S].=gR0:  
{ oe1Dm   
 CDC dc; O/;$0`~hY  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !M]_CPh]  
 CBitmap bm; +bnz%/v  
 int Width=GetSystemMetrics(SM_CXSCREEN); h#p1wK;N  
 int Height=GetSystemMetrics(SM_CYSCREEN); NG!~<Kx   
 bm.CreateCompatibleBitmap(&dc,Width,Height); !Pmv  
 CDC tdc; )KvQaC  
 tdc.CreateCompatibleDC(&dc); (C;oot,  
 CBitmap*pOld=tdc.SelectObject(&bm); FBfyW- 7  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); (+g!~MP  
 tdc.SelectObject(pOld); +*OY%;dQ7@  
 BITMAP btm; 4qw&G  
 bm.GetBitmap(&btm); qGS]2KY  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; | ?Js)i  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); pq;)l( Hi  
 BITMAPINFOHEADER bih; @C),-TM  
 bih.biBitCount=btm.bmBitsPixel; 41swG  
 bih.biClrImportant=0; 4v#3UG  
 bih.biClrUsed=0; EFl[u+ 1tx  
 bih.biCompression=0; /?b<}am  
 bih.biHeight=btm.bmHeight; $~,]F  
 bih.biPlanes=1; eZ~^Z8F[6  
 bih.biSize=sizeof(BITMAPINFOHEADER); Y4PU~ l  
 bih.biSizeImage=size; 'WH@Zk/l  
 bih.biWidth=btm.bmWidth; .MO"8}]8Z  
 bih.biXPelsPerMeter=0; @Bfwb?&  
 bih.biYPelsPerMeter=0; }<Y3 jQnl  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); AuZ?~I1  
 static int filecount=0; n*\AB=|X  
 CString name; Jt4T)c9  
 name.Format("pict%04d.bmp",filecount++); 7S<Z&1(  
 name=m_Path+name; 7QiJ1P.z  
 BITMAPFILEHEADER bfh; HaeF`gI^Ee  
 bfh.bfReserved1=bfh.bfReserved2=0; >c~~i-=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =U3,P%  
 bfh.bfSize=54+size; J[<3Je=>$  
 bfh.bfOffBits=54; ^=)? a;V  
 CFile bf; ,wmPK;j  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ B1@c`BJ;9T  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 45` Gv  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); BaIh,iu  
  bf.WriteHuge(lpData,size); ["N>Po  
  bf.Close(); IXp P.d  
  nCount++; L4SvE^2+  
 } `nM Huv  
 GlobalFreePtr(lpData); [!>2[bbl  
 if(nCount==1) Rs;,_  
  m_Number.Format("%d picture captured.",nCount); ?Mp)F2'  
 else Q!>8E4Z  
  m_Number.Format("%d pictures captured.",nCount); tq9t(0EL  
  UpdateData(FALSE); [|~X~AO%  
} Py 8o8*H  
n }lav  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) tZ1iaYbvV  
{ wxPg*R+t  
 if(pMsg -> message == WM_KEYDOWN) <_""4  
 { 7I4G:-V:^  
  if(pMsg -> wParam == VK_ESCAPE) hIa@JEIt  
   return TRUE; qv3L@"Ub  
  if(pMsg -> wParam == VK_RETURN) rS9*_-NH  
   return TRUE; M3 8,SH<  
 } n15c1=gs  
 return CDialog::PreTranslateMessage(pMsg); z x{\SU  
} z$p +l]  
ja2LQe@ Q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) nZQZ!Vfj  
{ $i@5'[jA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?|^1-5l3  
  SaveBmp(); ;D]TPBE  
  return FALSE; &eY$(o-Hw  
} =_cWCl^5  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Pw /wAUt  
 CMenu pop; iZ[o2Tre  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,%d n)gt7  
 CMenu*pMenu=pop.GetSubMenu(0); ;BoeE3* 6  
 pMenu->SetDefaultItem(ID_EXITICON); 'rf='Y  
 CPoint pt; 3uRnbO-  
 GetCursorPos(&pt); > ^3xBI:Q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); cZL"e  
 if(id==ID_EXITICON) ik~hL/JD\  
  DeleteIcon(); B7t#H?  
 else if(id==ID_EXIT) %{/0K<M  
  OnCancel(); Uy ;oJY  
 return FALSE; I}Q3B3Byg  
} Fg4eIE-/M  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); wr*A%:  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /H^bDUC :r  
 AddIcon(); Q}]:lmqH  
 return res; 4$.UVW\  
} ) !ZA.sx  
R|!4Y`  
void CCaptureDlg::AddIcon() w _eu@R:u@  
{ CNcH)2Mk  
 NOTIFYICONDATA data; 0e8)*2S  
 data.cbSize=sizeof(NOTIFYICONDATA); m{Q{ qJ5>  
 CString tip; 6?}8z q[  
 tip.LoadString(IDS_ICONTIP); iG!MIt*  
 data.hIcon=GetIcon(0); 7+T\  
 data.hWnd=GetSafeHwnd(); r~nrP=-%  
 strcpy(data.szTip,tip); $.kIB+K  
 data.uCallbackMessage=IDM_SHELL; T:cSv @G  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9L:v$4{LU  
 data.uID=98; e~rBV+f  
 Shell_NotifyIcon(NIM_ADD,&data); uK(+WA  
 ShowWindow(SW_HIDE); v}[KVwse  
 bTray=TRUE; xNxIqq<k  
} %X GX(  
@b!fs  
void CCaptureDlg::DeleteIcon() WF-imI:EK  
{ RWTv,pLK  
 NOTIFYICONDATA data; hPFIf>%}  
 data.cbSize=sizeof(NOTIFYICONDATA); w/G5I )G  
 data.hWnd=GetSafeHwnd(); 6mdJ =b#  
 data.uID=98;  Mw'd<{  
 Shell_NotifyIcon(NIM_DELETE,&data); :g<dwuVO  
 ShowWindow(SW_SHOW); O";r\Z  
 SetForegroundWindow(); $BH0W{S  
 ShowWindow(SW_SHOWNORMAL); .M:,pw"S]  
 bTray=FALSE; =#%e'\)a  
} m}Tu^dy  
Q1eiU Y6  
void CCaptureDlg::OnChange() 3L>V-RPiM  
{ Zb2 B5( 0  
 RegisterHotkey(); MzK&Jh  
} t4s}w$4  
~sSB.g  
BOOL CCaptureDlg::RegisterHotkey() (2qo9j"j/Y  
{ VdK-2O(.-  
 UpdateData(); ,  PN?_N  
 UCHAR mask=0; 9@D,ZSi  
 UCHAR key=0; k_}ICKzw1  
 if(m_bControl) PI0/=kS  
  mask|=4; M;Vx[s,#,  
 if(m_bAlt) {8I93]  
  mask|=2; G2L7_?/m  
 if(m_bShift) a.8nWs^  
  mask|=1; cW&OVNj  
  key=Key_Table[m_Key.GetCurSel()]; a+]=3o  
 if(bRegistered){  ITbl%q  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); k, v.U8  
  bRegistered=FALSE; l^0 <a<P  
 } 8KoPaq   
 cMask=mask;  KQW  
 cKey=key; iv;;GW{2  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $/wr?  
 return bRegistered; `hH1rw@7<  
} =}c~BHT  
SKG_P)TnO  
  四、小结 7%w4?Nv3I  
9@vY(k k  
  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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