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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: _cW6H B^j  
  M?fRiOj  
  一、实现方法 0{ ;[k  
?dcR!-3  
  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: q"Z!}^{  
6Y[|xu:N8Y  
#pragma data_seg("shareddata") WDdp(<  
HHOOK hHook =NULL; //钩子句柄 k;9"L90  
UINT nHookCount =0; //挂接的程序数目 ']]&<B}mz  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 GXE6=BO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @\UoZv(  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey >)IXc<"wq  
static int KeyCount =0; 4/B n9F  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %g<J"/  
#pragma data_seg() }_{QsPx9  
Y[yw8a  
  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。 0fd\R_"d.  
> \KVg(?D  
  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: FTg4i\Wp  
hIr$^%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR r 7mg>3  
cKey,UCHAR cMask) K{s% h0  
{ KtFxG6a  
 BOOL bAdded=FALSE; S"z cSkF  
 for(int index=0;index<MAX_KEY;index++){ a}w%k  
  if(hCallWnd[index]==0){ khW9n*  
   hCallWnd[index]=hWnd; X0.-q%5  
   HotKey[index]=cKey; u70-HFI@  
   HotKeyMask[index]=cMask; [8K+  zT5  
   bAdded=TRUE; F}lgy;=h  
   KeyCount++; l< y9ue=  
   break; ;5.o;|w?!  
  } 6!3Jr  
 } I:qfB2tL)O  
 return bAdded; o,sw[  
} T"GuE[?a  
//删除热键 /@H2m\vBX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dWI.t1`i  
{ $.z~bmH"D  
 BOOL bRemoved=FALSE; ]%y~cq  
 for(int index=0;index<MAX_KEY;index++){ D-8>?`n\  
  if(hCallWnd[index]==hWnd){ BI\+ NGrB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5w#*JK   
    hCallWnd[index]=NULL; '%m0@5|hCD  
    HotKey[index]=0; DJ9;{,gm  
    HotKeyMask[index]=0; N+vU@)_lC  
    bRemoved=TRUE; 0KF)+`CC>  
    KeyCount--; v^lR]9;  
    break; ` tkd1M  
   } g1uqsqYt  
  } '1}rQqZ  
 } A!kNqJ2  
 return bRemoved; }bv0~}G4  
} / h6(!-"  
Z`?<Ada  
q-.e9eoc\  
  DLL中的钩子函数如下: E00zf3Jgv'  
UEq;}4Bo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Ohm>^N;  
{ >q&Q4E0  
 BOOL bProcessed=FALSE; =oF6|\]{ ;  
 if(HC_ACTION==nCode) ZHs hg`I`  
 { !_`T8pJ`  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 toipEp<ci  
   switch(wParam) 1 ]@}+H  
   {  9 @yP;{Q  
    case VK_MENU: bw7!MAXd  
     MaskBits&=~ALTBIT; LC/w".oq?  
     break; fxDY:l  
    case VK_CONTROL: hG,gY;&[6  
     MaskBits&=~CTRLBIT; 2.2Z'$W  
     break; <(JsB'TK  
    case VK_SHIFT: n/"T7Y\2  
     MaskBits&=~SHIFTBIT; |<.b:e\4  
     break; 6bg+U`&g  
    default: //judge the key and send message 0NSn5Hq  
     break; 0;)6ZU  
   } |zu>G9m  
   for(int index=0;index<MAX_KEY;index++){ K)qbd~<\  
    if(hCallWnd[index]==NULL) v.1= TBh  
     continue; (oxe\Qk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'D-#,X C  
    { yvxC/Jo4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6QRfju'  
     bProcessed=TRUE; =3=KoH/'  
    } r1FE$R~C=  
   } F.=u Jdl.!  
  } Xl6)&   
  else if((lParam&0xc000ffff)==1){ //有键按下 4[3T%jA  
   switch(wParam) D^PsV  
   { +k"dN^K]D  
    case VK_MENU: $ Yz &x%Lb  
     MaskBits|=ALTBIT; HHZ!mYr  
     break; kXC.rgal  
    case VK_CONTROL: Xh]\q)  
     MaskBits|=CTRLBIT; b,a\`%m}  
     break; vc2xAAQ  
    case VK_SHIFT: yT&bS\  
     MaskBits|=SHIFTBIT; ?E2k]y6<  
     break; ^BM/K&7^  
    default: //judge the key and send message %:o@IRTRU  
     break; ](0 Vm_es  
   } ; _i0@@J  
   for(int index=0;index<MAX_KEY;index++){ Jb-wvNJu  
    if(hCallWnd[index]==NULL) [6S"iNiyKT  
     continue; =] 5;=>(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) K23_1-mbe  
    { p8"(z@T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lSyp k-c  
     bProcessed=TRUE; 9L#B"lh  
    } A2&&iL=j/  
   } f 5i`B*/  
  } =zA=D.D2  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 H>XbqIkL@  
   for(int index=0;index<MAX_KEY;index++){ 5 J|;RtcR  
    if(hCallWnd[index]==NULL) QBsDO].J<  
     continue; w#mnGD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [/uKo13  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zF i+6I$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 TiBE9  
   } ;oFaDTX]  
  } hqD;<:.  
 } >q &ouVE  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *A\NjXJl~  
} e+R.0E  
N/?Ms rZw  
  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: *vAOUqX`x  
o m_&|9B)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IVNNiNN*5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &< Gq-IN  
1]>KuXd r  
  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: IPxfjBC+J  
oZCi_g 5i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ` `;$Kr  
{ Ok`U*j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) )vU{JY;  
 { Ee|+uQ981>  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 _SP u`=~K  
  SaveBmp(); 3sZK[Y|ax  
  return FALSE; 8e\v5K9  
 } _&%!4n#>  
 …… //其它处理及默认处理 6$6NVq  
} ESrWRO f9  
X3m?zQbhv  
Na~_=3+a  
  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。 >Au<y,Tw  
>A,WXzAK}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。 3N*Shzusbt  
2mlE;.}8  
  二、编程步骤 CLkVe  
0KQ8; &a|  
  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"; _5m }g!  
8&UuwZ6i-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ai`:HhE  
Ez$5wY^J  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; H0(zE *c~  
Fp]8f&l8  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; -.*\J|S@g  
^n2w6U0  
  5、 添加代码,编译运行程序。 ;Z`)*TRp4  
|Gf{}  
三、程序代码 {f&ga  
1 I+5  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL /* O,T  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ;&!dD6N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ nDOIE)#  
#if _MSC_VER > 1000 oPbD9  
#pragma once rOD KM-7+  
#endif // _MSC_VER > 1000 V]O :;(W_  
#ifndef __AFXWIN_H__ Ur-^X(nL  
#error include 'stdafx.h' before including this file for PCH ZkIQ-;wx  
#endif u=l(W(9=  
#include "resource.h" // main symbols .)3 2WD%  
class CHookApp : public CWinApp {;}8Z$  
{ YQ)m?=+J  
 public: i@J,u  
  CHookApp(); 8 KkpXaz  
  // Overrides Vx*q'~4y!|  
  // ClassWizard generated virtual function overrides h^0mjdSp,  
  //{{AFX_VIRTUAL(CHookApp) &rd(q'Vi  
 public: I>5@s;  
  virtual BOOL InitInstance(); $ B9=v  
  virtual int ExitInstance(); =@w:   
  //}}AFX_VIRTUAL 0@Ijk(|  
  //{{AFX_MSG(CHookApp) `SwnKg  
  // NOTE - the ClassWizard will add and remove member functions here. 0&\Aw'21  
  // DO NOT EDIT what you see in these blocks of generated code ! (>K$gAQH  
  //}}AFX_MSG 2$o[  
  DECLARE_MESSAGE_MAP() 0/ Ht;(  
}; 'oHR4O*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); (Lo2fY5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 709eLhXrH  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =R'v]SXj  
BOOL InitHotkey(); mCGcM^21-x  
BOOL UnInit(); uf^:3{1  
#endif 0|ps),  
O$H150,Q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. H+;wnI>@  
#include "stdafx.h" _5T7A><q<  
#include "hook.h" .HBvs=i  
#include <windowsx.h> (6BCFl:/Q<  
#ifdef _DEBUG *e6|SZ &3  
#define new DEBUG_NEW ger<JSL%  
#undef THIS_FILE 1pb;A;F,A  
static char THIS_FILE[] = __FILE__;  mb/[2y<  
#endif ffM(il/2  
#define MAX_KEY 100 5G<CDgl^!  
#define CTRLBIT 0x04 2jW>uk4/i  
#define ALTBIT 0x02 {Pb^Lf >  
#define SHIFTBIT 0x01 Flxo%g};  
#pragma data_seg("shareddata") QRlzGRueR&  
HHOOK hHook =NULL; Ng"vBycy  
UINT nHookCount =0; Z~(XyaN  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey RNdnlD#P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT y2R=%EFh6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey j1 F+,   
static int KeyCount =0; %-l:_A  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift PBL^xlg  
#pragma data_seg() OD]J@m  
HINSTANCE hins; "AouiZkh  
void VerifyWindow(); a+/|O*>#  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) X6.O ;  
//{{AFX_MSG_MAP(CHookApp) \`zG`f  
// NOTE - the ClassWizard will add and remove mapping macros here. w4'K2 7  
// DO NOT EDIT what you see in these blocks of generated code! qYiAwK$  
//}}AFX_MSG_MAP MI(i%$R-A  
END_MESSAGE_MAP() 5G!U'.gr  
f4S@lyYF  
CHookApp::CHookApp() A E&n^vdQW  
{ GX)QIe~;qJ  
 // TODO: add construction code here, g8+,wSE  
 // Place all significant initialization in InitInstance *$(CiyF!  
} @(c<av?  
@S7=6RKa[  
CHookApp theApp; n6 G&^Oj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =BS'oBn^6  
{ XQOprIJ U  
 BOOL bProcessed=FALSE; F?} *ovy  
 if(HC_ACTION==nCode) udGGDH  
 { f hG2  
  if((lParam&0xc0000000)==0xc0000000){// Key up }qv-lO  
   switch(wParam) XyphQ}\u  
   { C[nr>   
    case VK_MENU: ? SP7vQ/  
     MaskBits&=~ALTBIT; 9Nu#&_2R  
     break; ~{YgM/c|dt  
    case VK_CONTROL: f*vk1dS:*3  
     MaskBits&=~CTRLBIT; mzB#O;3=  
     break; k6L373e#Q  
    case VK_SHIFT:  #>jH[Q  
     MaskBits&=~SHIFTBIT; 8MeXVhM  
     break; gVU\^KN]  
    default: //judge the key and send message /Q8A"'Nk  
     break; 1K9?a;.  
   } a{HgIQg_>R  
   for(int index=0;index<MAX_KEY;index++){ (eG]Cp@  
    if(hCallWnd[index]==NULL) R6Mxdm2P}  
     continue; $Q?G*@y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zfv(\SI  
    { s66XdM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~cBc&u:"  
     bProcessed=TRUE; sK-|xU.  
    } jL+}F/~r  
   } 'uAC oME@  
  } 0 a6@HwO  
  else if((lParam&0xc000ffff)==1){ //Key down 0^.4eX:E_  
   switch(wParam) 2{kfbm-89t  
   { UT<b v}(J  
    case VK_MENU: 'lsq3!d.  
     MaskBits|=ALTBIT; e'Us(]ZO  
     break; 'eDgeWt/CQ  
    case VK_CONTROL: 0nz@O^*g(  
     MaskBits|=CTRLBIT; bC>>^?U1m  
     break; V 1nZ M  
    case VK_SHIFT: $t# ,'M  
     MaskBits|=SHIFTBIT; XjZao<?u  
     break; BMWeD  
    default: //judge the key and send message jnp6qpY{  
     break; %[\x%m)  
   } Z*(! `,.bB  
   for(int index=0;index<MAX_KEY;index++) _K}_h\e.  
   { 5m USh3  
    if(hCallWnd[index]==NULL) G\>\VA  
     continue; +.#S[G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `J#xyDL6?  
    { <Mn7`i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &iiK ZZ`_o  
     bProcessed=TRUE; y8*@dRrq  
    } D2%G.z  
   } [G[{l$Eit  
  } O|OSE  
  if(!bProcessed){ _2X6bIE  
   for(int index=0;index<MAX_KEY;index++){ 8wpwJs&V  
    if(hCallWnd[index]==NULL) -)a_ub  
     continue; 8pL>wL &C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ky9No"o  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XBWSO@M'  
   } FHNuMdFn  
  } Rc:cVK  
 } o*wC{VP_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ";?C4%L  
} 2@m(XT (  
v8[ek@  
BOOL InitHotkey() -?w v}o  
{ %Di 7u- x  
 if(hHook!=NULL){ ds$\vSd  
  nHookCount++; _h=< _Z  
  return TRUE; AV[PQI  
 } xK),:+G(  
 else S,Wl)\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); oF b mz*  
  if(hHook!=NULL) 1Q&WoJLfR  
   nHookCount++; `b#nC[b6|v  
  return (hHook!=NULL); X:SzkkVl7  
} 18p3  
BOOL UnInit() gc2|V6(  
{ Y 6<0%  
 if(nHookCount>1){ o eJC  
  nHookCount--; Z!RRe]"y  
  return TRUE; `YmI'  
 } \B>[je-d  
 BOOL unhooked = UnhookWindowsHookEx(hHook); )_X xk_  
 if(unhooked==TRUE){ FM"GK '  
  nHookCount=0; COan) <Ku  
  hHook=NULL; Fe& n,  
 } 7Ysy\gZ&wp  
 return unhooked; 8A8xY446)  
} V:G}=~+=  
JM+sHHs  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) xH`j7qK.  
{ $~G0#JL  
 BOOL bAdded=FALSE; kf^-m/  
 for(int index=0;index<MAX_KEY;index++){ |Y8Mk2,s  
  if(hCallWnd[index]==0){ 0'%+X|  
   hCallWnd[index]=hWnd; cfC;eRgq~  
   HotKey[index]=cKey; zN)|g  
   HotKeyMask[index]=cMask; dW{o+9nw  
   bAdded=TRUE; Xs%R]KOwt  
   KeyCount++; =Qj+Ug'  
   break; Qor{1_h)+9  
  } R(/[NvUb  
 } 71 L\t3fG  
 return bAdded; ."F'5eTT~  
} >d27[%  
-@ UN]K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k;K> ,$ F  
{ z%}CB Tm  
 BOOL bRemoved=FALSE; ]cLEuE^&  
 for(int index=0;index<MAX_KEY;index++){ ~aqT~TL_  
  if(hCallWnd[index]==hWnd){ {? K|(C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D,GPn%Wqi  
    hCallWnd[index]=NULL; <r7qq$  
    HotKey[index]=0; e"o6C\c  
    HotKeyMask[index]=0; XMeL^|D  
    bRemoved=TRUE; /]k ,,&  
    KeyCount--; *2"bG1`  
    break; &3 XFg Ho  
   } ^T}}4I_Y  
  } N'eQ>2>O@  
 } 2sd ) w  
 return bRemoved; s.p1L  
} k}I5x1>&  
C>JekPeM  
void VerifyWindow() x  tYV"  
{ $K6?(x_  
 for(int i=0;i<MAX_KEY;i++){ $/<"Si&(  
  if(hCallWnd!=NULL){ "5o;z@(  
   if(!IsWindow(hCallWnd)){ RFZU}.*K$  
    hCallWnd=NULL; \N`fWh8&  
    HotKey=0; MAwC\7n+X  
    HotKeyMask=0; 9*-pden l  
    KeyCount--; M\\e e3Ih  
   } "UhK]i*@l  
  } Z0()pT  
 } Wk\mgGn+  
} `Ct'/h{  
%?]{U($?  
BOOL CHookApp::InitInstance() [Hv*\rb  
{ ,<0Rf  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 3r~>~ueZ  
 hins=AfxGetInstanceHandle(); PmPyb>HK=P  
 InitHotkey(); iioct_7,g<  
 return CWinApp::InitInstance(); bxd3  
} 9:9N)cNvfX  
?$30NK3G  
int CHookApp::ExitInstance() bk\dy7  
{ ;xW8Z<\-  
 VerifyWindow(); r3+<r<gs  
 UnInit(); aW`:)y&f  
 return CWinApp::ExitInstance(); zmy4tsmX  
} 0v_6cYA  
_" ?c9  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >zPO>.?h7T  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) K;<NBnH  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >u9id>+  
#if _MSC_VER > 1000 Ax5mP8S  
#pragma once ?r -\%_J_(  
#endif // _MSC_VER > 1000 N5q}::Odc  
u"`5  
class CCaptureDlg : public CDialog (TT3(|v  
{ :DOr!PNA  
 // Construction o9KyAP$2  
 public: bc3|;O  
  BOOL bTray; avu*>SB  
  BOOL bRegistered; Ij;==f~G  
  BOOL RegisterHotkey(); x !#Ma  
  UCHAR cKey; ]k[ Q]:q  
  UCHAR cMask; Cp .1/  
  void DeleteIcon(); YXczyZA`x  
  void AddIcon(); cPA~eZbX  
  UINT nCount; 7.wR"1p#  
  void SaveBmp(); eVqM=%Q  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JDC=J(B  
  // Dialog Data nwa\Lrh  
  //{{AFX_DATA(CCaptureDlg) ;yk9(wea}"  
  enum { IDD = IDD_CAPTURE_DIALOG }; @wd!&%yzO  
  CComboBox m_Key; V+qFT3?-  
  BOOL m_bControl; y;,=a jrF  
  BOOL m_bAlt; Ez zTJ>  
  BOOL m_bShift; O{lIs_1.Z  
  CString m_Path; 6V'wQqJ  
  CString m_Number; TqENaC#&  
  //}}AFX_DATA r+imn&FK8  
  // ClassWizard generated virtual function overrides MZCL:#  
  //{{AFX_VIRTUAL(CCaptureDlg) .@y{)/  
 public: bWGyLo,  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6@"Vqm|HD  
 protected: Si#"Wn?|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o\_ Td  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); X4d Xm>*?=  
  //}}AFX_VIRTUAL gbYLA a  
  // Implementation W0VA'W  
 protected: D3<IuWeM  
  HICON m_hIcon; >}ro[x`K  
  // Generated message map functions 9 b?i G  
  //{{AFX_MSG(CCaptureDlg) =}~NRmmF  
  virtual BOOL OnInitDialog(); I["F+kt^^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); e(?:g@]-r  
  afx_msg void OnPaint(); 6?53q e  
  afx_msg HCURSOR OnQueryDragIcon(); |$YyjYK  
  virtual void OnCancel(); B1|?RfCe  
  afx_msg void OnAbout(); Qy4X#wgD  
  afx_msg void OnBrowse(); Ty`-r5  
  afx_msg void OnChange(); >pgQb9 T+_  
 //}}AFX_MSG "sFW~Y  
 DECLARE_MESSAGE_MAP() e{v,x1Y_z(  
}; L@7Qs6G2u  
#endif pwa.q  
_L$)2sl1R  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file TF BYY{Y  
#include "stdafx.h" Vh 2Bz  
#include "Capture.h" hmc\|IF`  
#include "CaptureDlg.h" 1Z\(:ab13  
#include <windowsx.h> 5gO /-Zj  
#pragma comment(lib,"hook.lib") %l Q[dXp  
#ifdef _DEBUG Z1VC5* K  
#define new DEBUG_NEW " <<A  
#undef THIS_FILE 7sj<|g<h(_  
static char THIS_FILE[] = __FILE__; U5|B9%:&  
#endif G1kDM.L  
#define IDM_SHELL WM_USER+1 `-~`<#E[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x}v1X`6b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &J\B\`  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \eEds:Hg  
class CAboutDlg : public CDialog WLE%d]'%M  
{ :9(3h"  
 public: `2>XH:+7F  
  CAboutDlg();  `>%-  
  // Dialog Data \|v`l{  
  //{{AFX_DATA(CAboutDlg) V@B7 P{gH  
  enum { IDD = IDD_ABOUTBOX }; `Ac:f5a  
  //}}AFX_DATA _o\>V:IZ  
  // ClassWizard generated virtual function overrides L_E^}^1!  
  //{{AFX_VIRTUAL(CAboutDlg) ):/,w!1  
 protected: 4S'[\ZJO  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #]@9qPyn  
  //}}AFX_VIRTUAL X2i*iW<  
  // Implementation ^)|&|  
 protected: +-U@0&Y3M  
  //{{AFX_MSG(CAboutDlg) pQqbZ3]  
  //}}AFX_MSG xtOx|FkYcl  
  DECLARE_MESSAGE_MAP() n;%y  
}; 6*sw,sU[y  
q1H~ |1  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 9t#P~>:jY}  
{ t @;WgIp(&  
 //{{AFX_DATA_INIT(CAboutDlg) 7LG+$LEz  
 //}}AFX_DATA_INIT %Nl`~Kz9U  
} AU/#b(mI  
itw{;j   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )^&,Dj   
{ <]~ZPk[  
 CDialog::DoDataExchange(pDX); K|US~Hgv  
 //{{AFX_DATA_MAP(CAboutDlg) I|Z/`9T  
 //}}AFX_DATA_MAP Np$z%ewK.  
} `{DG;J03[  
yji>*XG  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) n"iNKR>nW  
 //{{AFX_MSG_MAP(CAboutDlg) F%Kp9I*  
 // No message handlers NaF(\j  
 //}}AFX_MSG_MAP  U7E  
END_MESSAGE_MAP() o_sQQF  
y86))  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 0D<TF>M;pn  
: CDialog(CCaptureDlg::IDD, pParent) cI3y  
{ #XcU{5Qm5  
 //{{AFX_DATA_INIT(CCaptureDlg) -/zp&*0gcx  
  m_bControl = FALSE; <>]1Y$^Y  
  m_bAlt = FALSE; pL! a  
  m_bShift = FALSE; IJ0#iA. T  
  m_Path = _T("c:\\"); 7RD$=?oO'  
  m_Number = _T("0 picture captured."); #K|0lau l  
  nCount=0; \04mLIJr9  
  bRegistered=FALSE; |gW    
  bTray=FALSE; (|dPeix|  
 //}}AFX_DATA_INIT <~N%W#z/  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Vg{Zv4+t  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p!}ZdX[u  
} 7u::5W-q  
eHUg-\dy  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4#_$@ r  
{ R5~gH6K|  
 CDialog::DoDataExchange(pDX); '#A:.P  
 //{{AFX_DATA_MAP(CCaptureDlg) Xk?R mU6  
  DDX_Control(pDX, IDC_KEY, m_Key); e{0L%%2K  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); x~EKGoz3  
  DDX_Check(pDX, IDC_ALT, m_bAlt); %J _ymJ'pd  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); g,=^'D  
  DDX_Text(pDX, IDC_PATH, m_Path); +RS$5NLH  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5KJ%]B(H2  
 //}}AFX_DATA_MAP e=7W 7^"_  
}  &+G; R  
+bUW!$G  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =e{.yggE  
//{{AFX_MSG_MAP(CCaptureDlg) r1;e 0\?`  
 ON_WM_SYSCOMMAND() Yy hny[fa9  
 ON_WM_PAINT() lVoik *,B  
 ON_WM_QUERYDRAGICON() ETO$9}x[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) @(>XOj?+  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) c" +zgP  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #]y5z i  
//}}AFX_MSG_MAP O#:&*Mv  
END_MESSAGE_MAP() ;%Q&hwj  
' S,2  
BOOL CCaptureDlg::OnInitDialog()  &{ZSE^  
{ R*bmu  
 CDialog::OnInitDialog(); B)6#Lp3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); t.)AggXj#  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3fp> 4;ym'  
 CMenu* pSysMenu = GetSystemMenu(FALSE); qp&4 1  
 if (pSysMenu != NULL) `|EH[W&y  
 { Pw{"_g  
  CString strAboutMenu; Bc<n2 C0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Xu#:Fe}:  
  if (!strAboutMenu.IsEmpty()) 4mJFvDZV`  
  { 88l,&2q  
   pSysMenu->AppendMenu(MF_SEPARATOR); nP1GW6Pu  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8_a3'o%5  
  } `%=<R-/#7S  
 } iP#=:HZu;  
 SetIcon(m_hIcon, TRUE); // Set big icon aMJ;bQD  
 SetIcon(m_hIcon, FALSE); // Set small icon W#{la`#Bu  
 m_Key.SetCurSel(0); h/K@IA d  
 RegisterHotkey(); +c) TDH  
 CMenu* pMenu=GetSystemMenu(FALSE); #9:2s$O[x  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); bi$VAYn.^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); mxp Y&Y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); yFjVKp'P  
 return TRUE; // return TRUE unless you set the focus to a control |dk[cX>  
} 8W -@N  
1 i3k  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) xA #H0?a]  
{ k':s =IXW  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >f$NzJ}  
 { 9Ejyg*  
  CAboutDlg dlgAbout; b\giJ1NJB  
  dlgAbout.DoModal(); R=M!e<'  
 } / M@ PO"  
 else :YNp8!?T?  
 { 56{I`QjX  
  CDialog::OnSysCommand(nID, lParam); 3m=2x5 {L  
 } ~O03Sit-  
} v{y{sA  
,{KCY[}|  
void CCaptureDlg::OnPaint() #epy%>  
{ `R+,1"5=  
 if (IsIconic()) [@G`Afaf  
 { " U8S81'  
  CPaintDC dc(this); // device context for painting $iPP|Rw  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); af'@h:  
  // Center icon in client rectangle *aRX \ TnN  
  int cxIcon = GetSystemMetrics(SM_CXICON); < kP+eD  
  int cyIcon = GetSystemMetrics(SM_CYICON); d#>y}H9  
  CRect rect; &z@~B&O  
  GetClientRect(&rect); x8"#!Pw:`"  
  int x = (rect.Width() - cxIcon + 1) / 2; N wtg%;  
  int y = (rect.Height() - cyIcon + 1) / 2; `@XehSQ  
  // Draw the icon Wi$dZOcSJ  
  dc.DrawIcon(x, y, m_hIcon); FjFwvO_.  
 } Fo}7hab  
 else _Y!sVJ){,c  
 { KDTDJ8  
  CDialog::OnPaint(); q3S+Y9L  
 } ST;t, D:  
} &&7r+.Y  
Oy_c  
HCURSOR CCaptureDlg::OnQueryDragIcon() j@| `f((4  
{ Eju~}:Lo  
 return (HCURSOR) m_hIcon; WG5W0T_  
} fdv`7u+}a  
BsLG^f  
void CCaptureDlg::OnCancel() W^3;F1  
{ 1@_T  m  
 if(bTray) #/ "+  
  DeleteIcon(); ; Lql_1  
  CDialog::OnCancel(); 1%`7.;!i  
} BX< dSK  
AGq>=avv  
void CCaptureDlg::OnAbout() ]KuMz p!  
{ ]'h; {;ug  
 CAboutDlg dlg; Qh`:<KI  
 dlg.DoModal(); C@gXT]Q 0}  
} q p~g P  
>/^#Drwb!i  
void CCaptureDlg::OnBrowse() qf8[!5GM  
{ S$[k Q|Am  
 CString str; {{!Y]\2S  
 BROWSEINFO bi; rU2iy"L  
 char name[MAX_PATH]; kWW w<cA  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); <Q5Le dN  
 bi.hwndOwner=GetSafeHwnd(); =6T 4>rP  
 bi.pszDisplayName=name; Cifd21v4  
 bi.lpszTitle="Select folder"; I%lE;'x  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -]S.<8<$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); G>z,#Xt  
 if(idl==NULL) ,Em$!n  
  return; %b}gDWs  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); _*6v|Ed?  
 str.ReleaseBuffer(); k\7:{y@,  
 m_Path=str; m*e YC  
 if(str.GetAt(str.GetLength()-1)!='\\') ^^Jnv{)  
  m_Path+="\\"; EKZVF`L  
 UpdateData(FALSE); A6"Hk0Hf  
} ]%dnKP~  
:}q\tNY<  
void CCaptureDlg::SaveBmp() \a|L/9%  
{ pq! %?m]  
 CDC dc; ,k0r  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); N_DT7  
 CBitmap bm; HY}j!X  
 int Width=GetSystemMetrics(SM_CXSCREEN); +R.N%_  
 int Height=GetSystemMetrics(SM_CYSCREEN); MI#mAg<  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 5VE2@Fn}  
 CDC tdc; rg QEUDEQ  
 tdc.CreateCompatibleDC(&dc); J5yidymrpW  
 CBitmap*pOld=tdc.SelectObject(&bm); E4[}lX}  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |$+5@+Zz  
 tdc.SelectObject(pOld); |qN'P}L  
 BITMAP btm; 3,eIB(  
 bm.GetBitmap(&btm); ma& To=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; "Ty/k8?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); KfY$ka[}"S  
 BITMAPINFOHEADER bih; NAr1[{^E,  
 bih.biBitCount=btm.bmBitsPixel; d&(_|xq#  
 bih.biClrImportant=0; n$)_9:Z-j  
 bih.biClrUsed=0; Pz"`MB<'Ik  
 bih.biCompression=0; (pR.Abq  
 bih.biHeight=btm.bmHeight; xN0*8  
 bih.biPlanes=1; Oejq@iM"(  
 bih.biSize=sizeof(BITMAPINFOHEADER); pwX C  
 bih.biSizeImage=size; {]}s#vvy  
 bih.biWidth=btm.bmWidth; b1`r!B,  
 bih.biXPelsPerMeter=0; Rf"Mr:^  
 bih.biYPelsPerMeter=0; e}{U7xQm1  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "ZMkL)'7-  
 static int filecount=0; KeBQH8A1N  
 CString name; *nTU# U  
 name.Format("pict%04d.bmp",filecount++); (lH,JX`$a  
 name=m_Path+name; USPTpjt8R  
 BITMAPFILEHEADER bfh; ANMg  
 bfh.bfReserved1=bfh.bfReserved2=0; ~H /2R  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +M\8>/0oA  
 bfh.bfSize=54+size; |M~ON=  
 bfh.bfOffBits=54; %y`7);.q  
 CFile bf; yy2I2Bv  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ LM l~yqM  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =y]$0nh  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &%C4Ugo  
  bf.WriteHuge(lpData,size); z;}6f  
  bf.Close(); ?Dsm~bkX[  
  nCount++; n(;:*<Rh  
 } mY&ud>,U:  
 GlobalFreePtr(lpData); =(, ^du'  
 if(nCount==1) `NNf&y)y  
  m_Number.Format("%d picture captured.",nCount); _}Ps(_5D  
 else oQ2KW..q  
  m_Number.Format("%d pictures captured.",nCount); <:;^'x>!  
  UpdateData(FALSE); yJ2B3i@T 4  
} 4&X*pL2;  
g /+oZU  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) WE!vSZ3R  
{ Ca>&  
 if(pMsg -> message == WM_KEYDOWN) vK'?:}~  
 { LXfCmc9|Z  
  if(pMsg -> wParam == VK_ESCAPE) 5\4g>5PD  
   return TRUE; =hH.zrI6e  
  if(pMsg -> wParam == VK_RETURN) 5z/Er".P  
   return TRUE; )@g;j>  
 } 2XSHZ|;  
 return CDialog::PreTranslateMessage(pMsg); sq0 PBEqq  
} \NL+}cL/  
b=PVIZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L2z2}U=<  
{ -V<t-}h.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "4xfrlOc  
  SaveBmp(); P9Q2gVGAO{  
  return FALSE; w7kJg'X/6  
} hkL5HzWn  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ V6a``i]  
 CMenu pop; iU2KEqCm  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); LLAa1Wq  
 CMenu*pMenu=pop.GetSubMenu(0); ~=n#}{/  
 pMenu->SetDefaultItem(ID_EXITICON); WMuD}s  
 CPoint pt; Mtm OUI&'  
 GetCursorPos(&pt); ^CT&0  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); l}g;'9ZB  
 if(id==ID_EXITICON) (k"_># %  
  DeleteIcon(); )LHj+B  
 else if(id==ID_EXIT) h#}YKWL  
  OnCancel(); arZ@3]X%a  
 return FALSE; ,TC;{ $O5  
} $&P?l=UG  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); rP=sG;d  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 773/#c  
 AddIcon(); {bNXedZ\  
 return res; JWO=!^  
} $.mQ7XDA9  
TYgQJW?  
void CCaptureDlg::AddIcon() R4's7k  
{ 4rNL":"O  
 NOTIFYICONDATA data; 3 /6/G}s  
 data.cbSize=sizeof(NOTIFYICONDATA); ||B;o-  
 CString tip; A2H4k|8  
 tip.LoadString(IDS_ICONTIP); g[z.*y/  
 data.hIcon=GetIcon(0); Ss ?CfRM  
 data.hWnd=GetSafeHwnd(); :VA.QrKW  
 strcpy(data.szTip,tip); ~%y@Xsot>  
 data.uCallbackMessage=IDM_SHELL; -M5=r>1;  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; # '|'r+  
 data.uID=98; 9ptFG]lZ  
 Shell_NotifyIcon(NIM_ADD,&data); '_0]vupvY  
 ShowWindow(SW_HIDE); ?(zoTxD  
 bTray=TRUE; Oxx^[ju~  
} c9Es%@]  
in%;Eqk  
void CCaptureDlg::DeleteIcon() PH4%R]{8{  
{ ;&;W T  
 NOTIFYICONDATA data; Ze^jG-SL$9  
 data.cbSize=sizeof(NOTIFYICONDATA); q }C+tn"\  
 data.hWnd=GetSafeHwnd(); rw%l*xgX  
 data.uID=98; !$qKb_#nC  
 Shell_NotifyIcon(NIM_DELETE,&data); |FR3w0o  
 ShowWindow(SW_SHOW); Ju` [m  
 SetForegroundWindow(); VDEv>u4  
 ShowWindow(SW_SHOWNORMAL); } /^C|iS7  
 bTray=FALSE; kMxazx1  
} ?:rx1}:F  
h rN%  
void CCaptureDlg::OnChange() o@E/r.uK  
{ -7-['fX  
 RegisterHotkey(); p#d+>7  
} xBnbF[  
Zf*r2t1&P  
BOOL CCaptureDlg::RegisterHotkey() KU&G;ni2  
{ _Tm0x>EM  
 UpdateData(); N]/!mo?  
 UCHAR mask=0; |I8Mk.Z=FA  
 UCHAR key=0; @]CF&: P A  
 if(m_bControl) ': F}3At  
  mask|=4; Fw4*  
 if(m_bAlt) 8Z#j7)G  
  mask|=2; sYbH|}  
 if(m_bShift) ?h\mk0[  
  mask|=1; MFit|C  
  key=Key_Table[m_Key.GetCurSel()]; wOgE|n  
 if(bRegistered){ rjA@U<o  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); e,1u  
  bRegistered=FALSE; @)YY\l#  
 } /!FWuRe^  
 cMask=mask; Xo5$X7m  
 cKey=key; h\[\\m O  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); tV;% J4E'  
 return bRegistered; HaNboYW_K  
} :Waox"#=g  
!3&kQpF  
  四、小结 8|1^|B(l  
8s}J!/2  
  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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