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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: *FgJ|y6gk  
  Wr|G:(kw\!  
  一、实现方法  7 Yv!N  
mv Ov<x;l  
  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: ~I_owCVZ  
8<PKKDgbfd  
#pragma data_seg("shareddata") E)YVfM  
HHOOK hHook =NULL; //钩子句柄 !G=>ve  
UINT nHookCount =0; //挂接的程序数目 |KG&HN fP-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 IS_Su;w>4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 $Tl<V/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey FRyPeZR  
static int KeyCount =0; -Wo15O"  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ]EL\)xCr  
#pragma data_seg() RtF8A5ys  
]W9B6G_  
  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。 4~u9B/v  
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  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: 13f<0wg  
,ECAan/@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .gD km^  
cKey,UCHAR cMask) cx(2jk}6  
{ LM,fwAX  
 BOOL bAdded=FALSE; INNAYQ  
 for(int index=0;index<MAX_KEY;index++){ f]_mzF=&  
  if(hCallWnd[index]==0){ w7Dt1axB  
   hCallWnd[index]=hWnd; F1u)i  
   HotKey[index]=cKey; #\FT EY!  
   HotKeyMask[index]=cMask; Gt^d;7x]  
   bAdded=TRUE; pt!'v$G/*  
   KeyCount++; 3IyZunFT  
   break; !$kR ;Q"/  
  } wJIB$3OT  
 } h[U7!aM  
 return bAdded; QrS$P09=\  
} #8?^C]*{0  
//删除热键 };SV!'9s?~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) YOw?'+8  
{ sd!sus|( R  
 BOOL bRemoved=FALSE; "3y}F  
 for(int index=0;index<MAX_KEY;index++){ zl)&U=4l  
  if(hCallWnd[index]==hWnd){ YN#XmX%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :WX0,-Gn  
    hCallWnd[index]=NULL; WN0c %kz=  
    HotKey[index]=0; ;QPy:x3  
    HotKeyMask[index]=0; f-+.;`H)T  
    bRemoved=TRUE; )Qr6/c 8}  
    KeyCount--; d.\PS9l  
    break; _t.FL@3e  
   } fOBN=y6x  
  } 1ih*gJPpj  
 } R+Lk~X^*l'  
 return bRemoved; >l2w::l%  
} 5P\N"Yjx'  
_;G=G5r  
tp+=0k2i  
  DLL中的钩子函数如下: <IH*\q:7  
22vq=RO7Z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j`9Nwa  
{ 3H'*?|Y(#  
 BOOL bProcessed=FALSE; >EBC 2WJ  
 if(HC_ACTION==nCode) K -E`y  
 { gb_X?j%p7  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 wP`sXPSmIu  
   switch(wParam) !aeNq82  
   {  PW^ 8;[\QP  
    case VK_MENU: ;IhPvff  
     MaskBits&=~ALTBIT; ewQe/Fq  
     break; ,>w}xWSYpG  
    case VK_CONTROL: pzSqbgfrQ  
     MaskBits&=~CTRLBIT; {Q<0\`A  
     break; ?#ihJt,  
    case VK_SHIFT: Z:^3Fm->+  
     MaskBits&=~SHIFTBIT; ^srs$ w]  
     break; Oxj(g;}  
    default: //judge the key and send message {rfte'4;=  
     break; j 0?>w{e  
   } ?Ccw4]YO,=  
   for(int index=0;index<MAX_KEY;index++){ V/&o]b   
    if(hCallWnd[index]==NULL) 8r^j P.V  
     continue; r#I>_Utsy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u\w2S4c  
    { =LqL@5Xr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); J";=d4Sd  
     bProcessed=TRUE; aH^{Vv$]M@  
    } [a+4gy  
   } L5C2ng>  
  } w .l|G,%=  
  else if((lParam&0xc000ffff)==1){ //有键按下 }{=8&gA0  
   switch(wParam) `U#Po_hq  
   { WVkG 2  
    case VK_MENU: %^U"Spv;  
     MaskBits|=ALTBIT; fp-m.d:|  
     break; I4ctxMVP  
    case VK_CONTROL: $owb3g(%4  
     MaskBits|=CTRLBIT; %09*l%,;  
     break; `{L{wJ:&a  
    case VK_SHIFT: ,5:![  
     MaskBits|=SHIFTBIT; ' 3VqkQ4  
     break; 8>d q=0:  
    default: //judge the key and send message qxSs ~Qc  
     break; ##2`5i-x  
   } "B?R| Xg  
   for(int index=0;index<MAX_KEY;index++){ ~zj"OG"zOw  
    if(hCallWnd[index]==NULL) S|) J{~QH  
     continue; @Q3, bj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1W0.Ufl)  
    { sSy$(%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \Nyr=<c  
     bProcessed=TRUE; NkoofhZ  
    } W/a,.M  
   } 7 y>(H<^>  
  } +i4P,Lp  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $>(9~Yh0  
   for(int index=0;index<MAX_KEY;index++){ 5Abz 5-^KH  
    if(hCallWnd[index]==NULL) l\Cu1r-z  
     continue; /khnl9~+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >*{:l,LH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); YPG,9iZ&f  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 <oZ(ng@X  
   } oL)lyUVT  
  } =kF? _KN  
 } lh~<s2[R2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); LVoyA/ F  
} $)l2G;&  
>mew"0Q  
  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: KZZOi:  
bu_/R~&3{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Pwg/Vhfh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :+<t2^)rD  
EZ*t$3.T  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Dl&PL  
4*H(sq  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) tr5'dX4]  
{ +*: }p  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) S;>4i!Mb ^  
 { C)U #T)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ),M U+*`  
  SaveBmp(); 9n-T5WP  
  return FALSE; e"lD`*U8R  
 } (;C$gnr.C  
 …… //其它处理及默认处理 2c"/QT  
} '1Y<RD>x  
T<XfZZ)l<`  
8F\~Wz7K  
  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。 m'3OGvd  
ZRX^^yN  
  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。 f!mE1,eBEe  
ruzMag)  
  二、编程步骤 /G{&[X<4U  
8NxUx+]  
  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"; I7A7X*  
Kq8 (d`g}  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; cl@kRX<7'  
FoQ?U=er  
  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; 2.!1kije  
F9v)R #u~  
  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; "OVi /:*B  
u"*J[M~  
  5、 添加代码,编译运行程序。 ^M [#^wv,  
;,mBT[_ZO  
三、程序代码 ?rAi=w&c  
!~?W \b\:  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL a^%8QJW  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ^dheJ]n=k  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ sN"p5p  
#if _MSC_VER > 1000 /4(Z`e;0  
#pragma once ;tXB46  
#endif // _MSC_VER > 1000 ]!]`~ Z/  
#ifndef __AFXWIN_H__ q|R+x7x  
#error include 'stdafx.h' before including this file for PCH  ^8b~ZX  
#endif ! Zno[R  
#include "resource.h" // main symbols e',hC0&S  
class CHookApp : public CWinApp F19;RaP+  
{ (6e!09P&  
 public: 9qnuR'BDu  
  CHookApp(); /]pX8 d  
  // Overrides _RN/7\  
  // ClassWizard generated virtual function overrides ) )fDOJ  
  //{{AFX_VIRTUAL(CHookApp) u):X>??  
 public: 9)#gtDM%J  
  virtual BOOL InitInstance(); Ewa[Y=+tx  
  virtual int ExitInstance(); X77A; US  
  //}}AFX_VIRTUAL jM6uT'Io  
  //{{AFX_MSG(CHookApp) 37J\i ]  
  // NOTE - the ClassWizard will add and remove member functions here. 0Ddn@!J*  
  // DO NOT EDIT what you see in these blocks of generated code ! u4go*#  
  //}}AFX_MSG JqL<$mSep  
  DECLARE_MESSAGE_MAP() ]lymY _ >  
}; &uv>'S#%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); JJ^iy*v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %j~9O~-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .@4QkG/  
BOOL InitHotkey(); V#p G; ,  
BOOL UnInit(); 9"m, p  
#endif We[<BJ o4  
|3s.;w K  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *K]>}  
#include "stdafx.h" jK& Nkp  
#include "hook.h" iSnIBs9\  
#include <windowsx.h> Kh>?!` lL  
#ifdef _DEBUG ['/;'NhdlY  
#define new DEBUG_NEW VC/R)%@%  
#undef THIS_FILE (3)C_Z  
static char THIS_FILE[] = __FILE__; QBg}2.  
#endif Wpiv1GZ%c8  
#define MAX_KEY 100 HR/k{"8W4Q  
#define CTRLBIT 0x04 L#@l(8.  
#define ALTBIT 0x02 6lB{Ao?|  
#define SHIFTBIT 0x01 {KF7j63  
#pragma data_seg("shareddata") nL 1IS  
HHOOK hHook =NULL; .t"n]X i  
UINT nHookCount =0; >l7eoj  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey *O2^{ C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Se!gs>  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (1QdZD|  
static int KeyCount =0; 8Uj68Jl?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift {LR#(q$1  
#pragma data_seg() 6|Ba  
HINSTANCE hins; >qSO,$  
void VerifyWindow(); $M:4\E5(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [V!^\g\6  
//{{AFX_MSG_MAP(CHookApp) )_Z]=5Ds  
// NOTE - the ClassWizard will add and remove mapping macros here. BsoFQw4$9  
// DO NOT EDIT what you see in these blocks of generated code! Y2RxD\!Z  
//}}AFX_MSG_MAP >WGX|"!"  
END_MESSAGE_MAP() m]+X }|  
aRFi0h \  
CHookApp::CHookApp() ucIVVT(u  
{ T{5M1r  
 // TODO: add construction code here, 4<=eK7;XR  
 // Place all significant initialization in InitInstance eukX#0/^  
} z6GL,wo#  
mafAC73  
CHookApp theApp; {|8:U}<#h  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5Ws:Ei{R  
{ avYh\xZ  
 BOOL bProcessed=FALSE; n?TO!5RZK  
 if(HC_ACTION==nCode) ;Xnk+  
 { IqR[&T)lj  
  if((lParam&0xc0000000)==0xc0000000){// Key up O3sla bE#  
   switch(wParam) xEd#~`Jmr  
   { mI{CM: :  
    case VK_MENU: "B_5Y&pM`  
     MaskBits&=~ALTBIT; Zq2H9^![y~  
     break; g7E`;&f  
    case VK_CONTROL: /NPl2\o.  
     MaskBits&=~CTRLBIT; >tE,8  
     break; $g}/T_26  
    case VK_SHIFT: LbtlcpF*~5  
     MaskBits&=~SHIFTBIT; #R"9)vHp  
     break; ]5qjK~,4b  
    default: //judge the key and send message IdN%f]=/  
     break; ":(Cpf0  
   } T1g:gfw@  
   for(int index=0;index<MAX_KEY;index++){ q\{;_?a  
    if(hCallWnd[index]==NULL) ^^j|0qshL  
     continue; J8`1V `$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tA;ZW2$#  
    { OI;L9\MJc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g%<{G/Tz  
     bProcessed=TRUE; <uWJ>sg^ 6  
    } ~@a) E+LsF  
   } W2X+N acD  
  } }[hDg6i  
  else if((lParam&0xc000ffff)==1){ //Key down Aw_R $  
   switch(wParam) AR[M8RA  
   { YV2pERl  
    case VK_MENU: A61-AwvF8-  
     MaskBits|=ALTBIT; *`\4j*$^  
     break; 0*]<RM  
    case VK_CONTROL: qZyt>SAx  
     MaskBits|=CTRLBIT; y7}~T!UyfF  
     break; $AL|d[[T[  
    case VK_SHIFT: IAt+S-q0  
     MaskBits|=SHIFTBIT; Ay[9k=q]  
     break; 0zq\ j  
    default: //judge the key and send message =:0IHyB#0  
     break; ej??j<]  
   } G%W03c  
   for(int index=0;index<MAX_KEY;index++) CO6XIgTe  
   { zL[U;  
    if(hCallWnd[index]==NULL) @N:3`[oB  
     continue; U`vt/#j 1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :`!mCW`Q-  
    { )9;kzp/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); im^I9G  
     bProcessed=TRUE; .jG.90  
    } k?@W/}Iv9  
   } a}+ _Yo(Q  
  } EZu  
  if(!bProcessed){ Xb07 l3UG  
   for(int index=0;index<MAX_KEY;index++){ s$=B~l  
    if(hCallWnd[index]==NULL) fjeE.  
     continue; E rRMiT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a} Iz  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <P Z\qE*+y  
   } _ZvX"{y~  
  } EWvid4QEi  
 } [+[fD  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7C 6BZ$(  
} %%-Tjw o  
Ni;{\"Gt  
BOOL InitHotkey() nq w*oLFQ  
{ &b#NF1Q.  
 if(hHook!=NULL){ i~M.F=I5  
  nHookCount++; s13 d*  
  return TRUE; rH9|JEz  
 } {Ac3/UM/  
 else h: (l+jr  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); kv`3Y0R-"  
  if(hHook!=NULL) ;kcFQed\w  
   nHookCount++; xdSj+507  
  return (hHook!=NULL); Zp P6Q  
} lVK F^-i  
BOOL UnInit() {gq:sj>  
{ /)HEx&SQmZ  
 if(nHookCount>1){ ^SES')x  
  nHookCount--; vN[m5)aT  
  return TRUE; jl|X$w  
 } i =+<7]Q  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 9= ;g4I  
 if(unhooked==TRUE){ P|QnZ){  
  nHookCount=0; YJ;a{)e  
  hHook=NULL; _a02#  
 } u=?P*Y/|W  
 return unhooked; X$Qi[=L  
} vzQmijr-  
Ffqn|} gb  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vskM;  
{ 'Y/V9;`)s  
 BOOL bAdded=FALSE; 6(Rq R  
 for(int index=0;index<MAX_KEY;index++){ n$VPh/  
  if(hCallWnd[index]==0){ enO=-#  
   hCallWnd[index]=hWnd; 8*X L19N  
   HotKey[index]=cKey; d(cYtM,P  
   HotKeyMask[index]=cMask; )fcpE,g'  
   bAdded=TRUE; [;\< 2=H  
   KeyCount++; r4qV}-E  
   break; ^*T{-U'  
  } Xv;ZAa  
 } D_`)T;<Sp  
 return bAdded; w+ )GM  
} [}B{e=`!  
{`SGB;ho  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S+=@d\S}"  
{ D"><S<C\C  
 BOOL bRemoved=FALSE; &rE l  
 for(int index=0;index<MAX_KEY;index++){ X\:(8C;+  
  if(hCallWnd[index]==hWnd){ 3R96;d;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {d5ur@G1  
    hCallWnd[index]=NULL;  AHg4kG  
    HotKey[index]=0; +/ d8d  
    HotKeyMask[index]=0; E~U|v'GCd  
    bRemoved=TRUE; ZtZV:re=  
    KeyCount--; a[OLS+zf!P  
    break; A&|(%  
   } m_W.r+s~C4  
  } uTF EI.N  
 } [aVJYr2  
 return bRemoved; [75e\=wK  
} XsCbJ[Z_?q  
8Y kH  
void VerifyWindow() -cC(d$y  
{ Q? |MBTo  
 for(int i=0;i<MAX_KEY;i++){ k{&E}:A  
  if(hCallWnd!=NULL){ =cX"gI[  
   if(!IsWindow(hCallWnd)){ sJ*U Fm{  
    hCallWnd=NULL; LGue=Hkp  
    HotKey=0; g{.@|;d <p  
    HotKeyMask=0; <\Dl#DH  
    KeyCount--; @G&xq "Fg7  
   } 04LVa|Y@U  
  } :'Kx?Es   
 } mr\L q~*c  
} m,"tdVo.  
G@6,O-Sj  
BOOL CHookApp::InitInstance() Wam?(!{mOf  
{ >Qu^{o  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >LZ)<-Mk  
 hins=AfxGetInstanceHandle(); 'wHkE/ 83  
 InitHotkey(); {}2p1-(  
 return CWinApp::InitInstance(); k:yu2dQh  
} >.sN?5}y  
?v*7!2;  
int CHookApp::ExitInstance() 4C*=8oe_  
{ nqW:P$  
 VerifyWindow(); im%3*bv-  
 UnInit(); 2n,73$ s  
 return CWinApp::ExitInstance(); 833t0Ml1A/  
} mqxy(zS]  
W- B[_  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?a_q!,8:  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) DFH6.0UW  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (9lx5  
#if _MSC_VER > 1000 WM7/|.HQ  
#pragma once + {dIs  
#endif // _MSC_VER > 1000 e;Z`&  
+ opN\`  
class CCaptureDlg : public CDialog 9`VF [* 9  
{ VZ!$'??  
 // Construction u$^` hzfI  
 public: jCa;g{#@  
  BOOL bTray; ,3[<C)'[  
  BOOL bRegistered; 2fA9L _:0  
  BOOL RegisterHotkey(); `)P_X4e]`  
  UCHAR cKey; TniKH( w/  
  UCHAR cMask; `cRB!w=KHV  
  void DeleteIcon(); T`G"2|ISS  
  void AddIcon(); *XR~fs?/*W  
  UINT nCount; }J lW\#  
  void SaveBmp(); I=-;*3g6  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 73<yrBxp  
  // Dialog Data  `a9>4  
  //{{AFX_DATA(CCaptureDlg) U Bg_b?k  
  enum { IDD = IDD_CAPTURE_DIALOG }; *a.*Ha  
  CComboBox m_Key; kV<)>Gs  
  BOOL m_bControl; )SLs  [  
  BOOL m_bAlt; \C.@ @4{  
  BOOL m_bShift; n[-!Jp[  
  CString m_Path; &g {_.n,  
  CString m_Number; W.<<azi  
  //}}AFX_DATA _QCI< |A  
  // ClassWizard generated virtual function overrides (`*wiu+i  
  //{{AFX_VIRTUAL(CCaptureDlg) 0_.hU^fP  
 public: t fQq3#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); |`/uS;O  
 protected: m^+ ~pC5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support YtQWArX,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); N$b;8F  
  //}}AFX_VIRTUAL I'YotV7  
  // Implementation 2"^9t1C2  
 protected: k"c_x*f  
  HICON m_hIcon; F4{<;4N0  
  // Generated message map functions pP& M]'  
  //{{AFX_MSG(CCaptureDlg) ^a5>`W  
  virtual BOOL OnInitDialog(); a"4 6_>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {P+[C O  
  afx_msg void OnPaint(); Puh&F< B  
  afx_msg HCURSOR OnQueryDragIcon(); ?Ea"%z*c5  
  virtual void OnCancel(); rpWy 6oD  
  afx_msg void OnAbout(); #+\G- =-  
  afx_msg void OnBrowse(); 9mm(?O~'p  
  afx_msg void OnChange(); `7ZJB$7D|*  
 //}}AFX_MSG 1>{(dd?L  
 DECLARE_MESSAGE_MAP() 9\2&6H  
}; JH#?}L/0Fe  
#endif !}7m^  
lY`<-`{I_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file j+/*NM_y3  
#include "stdafx.h" -GjJrYOU  
#include "Capture.h" S\(_"xJPp  
#include "CaptureDlg.h" N|}`p"  
#include <windowsx.h> aoS1Yt'@  
#pragma comment(lib,"hook.lib") r0>T7yPAK  
#ifdef _DEBUG J>35q'nN]F  
#define new DEBUG_NEW T(DE^E@a  
#undef THIS_FILE hrF4 a$  
static char THIS_FILE[] = __FILE__; t"fD"Xpj  
#endif 1 doqznO  
#define IDM_SHELL WM_USER+1 K(2s%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m6D4J=59  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l<?wB|1'  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; NBX/V^  
class CAboutDlg : public CDialog *Yw6UCO  
{ R#M).2::  
 public: wxxC&!  
  CAboutDlg(); WTx;,TNG  
  // Dialog Data L8Q!6oO=<  
  //{{AFX_DATA(CAboutDlg) Y`uCDfcQ  
  enum { IDD = IDD_ABOUTBOX }; (Bz(KyD[  
  //}}AFX_DATA ).xWjVC  
  // ClassWizard generated virtual function overrides 3}+ \&[  
  //{{AFX_VIRTUAL(CAboutDlg) S{6u\Vy  
 protected: `<q5RuU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mr? ii  
  //}}AFX_VIRTUAL \mloR '  
  // Implementation '>BHwc  
 protected: 0sa EcJ-  
  //{{AFX_MSG(CAboutDlg) v]~[~\|a  
  //}}AFX_MSG [qB=OxH?  
  DECLARE_MESSAGE_MAP() @$]h[   
}; S8l+WF4q  
M;R>]wP"V  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Tx_ LH"8  
{ 7Z_iQ1  
 //{{AFX_DATA_INIT(CAboutDlg) )SuJK.IF  
 //}}AFX_DATA_INIT 3]acfCacC  
} ~4 ab\hq  
:|Cf$2k7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9tO_hhEQ@  
{ -5K/ cK  
 CDialog::DoDataExchange(pDX); 2X`M&)"X  
 //{{AFX_DATA_MAP(CAboutDlg) 4p.O<f;A8  
 //}}AFX_DATA_MAP tN~{Mt$-W  
} "2J;~  
szHUHW~;J  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4~4Hst#^  
 //{{AFX_MSG_MAP(CAboutDlg) F<[8!^l(z  
 // No message handlers K9R[ oB]b  
 //}}AFX_MSG_MAP bu- RU(%  
END_MESSAGE_MAP() .@'Vz;&mQ  
m\yO/9{h1  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) xlAaIo)T  
: CDialog(CCaptureDlg::IDD, pParent) `F#KXk  
{ H@zpw1fH+  
 //{{AFX_DATA_INIT(CCaptureDlg) U!4 ^;  
  m_bControl = FALSE; /_P`xm+=AC  
  m_bAlt = FALSE; 0U'r ia:$  
  m_bShift = FALSE; <,{v>vlw  
  m_Path = _T("c:\\"); R[QE:#hT  
  m_Number = _T("0 picture captured."); rk|6!kry  
  nCount=0; 0W)_5f&  
  bRegistered=FALSE; n !QjptQ  
  bTray=FALSE; ]+AI:  
 //}}AFX_DATA_INIT $1e@3mzM  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 [>E0(S]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 4.8,&{w<m  
} 0^=S:~G  
\MU4"sXw  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hf[K\aAk  
{ kcle|B  
 CDialog::DoDataExchange(pDX); (\j<`"n  
 //{{AFX_DATA_MAP(CCaptureDlg) $a G'.0HW  
  DDX_Control(pDX, IDC_KEY, m_Key); ]#nAld1cmy  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); <FP -]R)  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Xp' KQ1w)  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); f] Vz!hM~  
  DDX_Text(pDX, IDC_PATH, m_Path); N|DY)W  
  DDX_Text(pDX, IDC_NUMBER, m_Number); x {rt\OT  
 //}}AFX_DATA_MAP .#X0P=  
} HwHI$IB  
)~6974  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) m5S/T\,X  
//{{AFX_MSG_MAP(CCaptureDlg) gI]Vyg<{d  
 ON_WM_SYSCOMMAND() MIgIt"M jz  
 ON_WM_PAINT() 7Ny>W(8  
 ON_WM_QUERYDRAGICON() Xe5J  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) HN:{rAIfc  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }~7>S5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) |^ qW   
//}}AFX_MSG_MAP 8]O|$8'"  
END_MESSAGE_MAP() <^=k~7m  
PSRGlxdO  
BOOL CCaptureDlg::OnInitDialog() JOMZ&c^  
{ KksbhN{AB  
 CDialog::OnInitDialog(); Z5\6ca  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); yH Cc@`1.  
 ASSERT(IDM_ABOUTBOX < 0xF000); J(Bn  n  
 CMenu* pSysMenu = GetSystemMenu(FALSE); '&"7(8E} *  
 if (pSysMenu != NULL) V #=N?p  
 { T/H*Bo *=5  
  CString strAboutMenu; .m<-)Kx  
  strAboutMenu.LoadString(IDS_ABOUTBOX); \1tce`+  
  if (!strAboutMenu.IsEmpty()) nP}/#Wy  
  { |aZ^K\yIF  
   pSysMenu->AppendMenu(MF_SEPARATOR); { Z|C  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /:S.(" Unv  
  } eA!aUu  
 } w:qwU\U>x  
 SetIcon(m_hIcon, TRUE); // Set big icon .N%$I6w  
 SetIcon(m_hIcon, FALSE); // Set small icon |Oo WGVc  
 m_Key.SetCurSel(0); f~]5A%=cZ  
 RegisterHotkey(); WYq, i}S  
 CMenu* pMenu=GetSystemMenu(FALSE); \UXQy{Ex  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); PgVM>_nHk  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ar6Z?v$  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); U*-%V$3+w5  
 return TRUE; // return TRUE unless you set the focus to a control kr3ZqMfeI  
} A) qOJ(OEz  
u", [ulP  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) KmMt:^9  
{ 8J)x>6  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) O". #B  
 { Z I8p(e  
  CAboutDlg dlgAbout; C}M0KDF  
  dlgAbout.DoModal(); R8ZW1  
 } pM>.z9  
 else >9|Q,/b0  
 { 'HOt?lpu!  
  CDialog::OnSysCommand(nID, lParam); ;N)qNiJY  
 } cM55 vVd  
} er97&5  
sUg7  
void CCaptureDlg::OnPaint() 2hquE_1S[w  
{ @.%ll n  
 if (IsIconic()) WhkE&7Gk  
 { +jHL==W&  
  CPaintDC dc(this); // device context for painting U7{, *  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); >:Rc%ILym  
  // Center icon in client rectangle b+w|3bQa  
  int cxIcon = GetSystemMetrics(SM_CXICON); 5Eq_L  
  int cyIcon = GetSystemMetrics(SM_CYICON); \wTW hr0  
  CRect rect; I+}h+[W  
  GetClientRect(&rect); V;>p@uE,P  
  int x = (rect.Width() - cxIcon + 1) / 2; `LNRl'Z m  
  int y = (rect.Height() - cyIcon + 1) / 2; ~x824xW  
  // Draw the icon ll6~8PN  
  dc.DrawIcon(x, y, m_hIcon); : G<1   
 } OYe @P  
 else .rwZ`MP  
 { ,UY],;ib  
  CDialog::OnPaint(); ^G5 _d"Gr  
 } [~$9n_O94  
} 42Z2Mjtk  
J.~$^-&!  
HCURSOR CCaptureDlg::OnQueryDragIcon() :[,n`0lH  
{ :c c#e&BO  
 return (HCURSOR) m_hIcon; <x,$ODso  
} {"O'kx  
si)920?E&  
void CCaptureDlg::OnCancel() \vKMNk;kz  
{ =T9QmEBm  
 if(bTray) [0  3Aej  
  DeleteIcon(); 1XwbsKQ}  
  CDialog::OnCancel(); ,b2Cl[  
} y6;A4p>  
nd-y`@z  
void CCaptureDlg::OnAbout() %|4Nmf$:Og  
{ ?FD^S~bz-  
 CAboutDlg dlg; R\)pW9)  
 dlg.DoModal(); fAYm3+.l3  
} XD9lox  
)fv0H&g  
void CCaptureDlg::OnBrowse() l\a 0 k4  
{ 2}t2k>  
 CString str; TN(1oJ:  
 BROWSEINFO bi; W,}C*8{+  
 char name[MAX_PATH]; @99@do |C  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~p^6  
 bi.hwndOwner=GetSafeHwnd(); :+; U W \  
 bi.pszDisplayName=name; |R DPx6!V  
 bi.lpszTitle="Select folder"; W$  M4#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  #\Lt0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); }~yhkt5K  
 if(idl==NULL) _z~|*7@  
  return; B_nim[72  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); | M4_@P  
 str.ReleaseBuffer(); 9>%ti&_-jt  
 m_Path=str;  GVe[)R  
 if(str.GetAt(str.GetLength()-1)!='\\') BG/M3  
  m_Path+="\\"; j$siCsF  
 UpdateData(FALSE); eNpGa0 eG  
} YrFB~z.V  
F:1w%#6av  
void CCaptureDlg::SaveBmp() Js ~_8  
{ qf7 lQovK  
 CDC dc; o{lR_  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #1+1q{=Z<  
 CBitmap bm; DhYQ>Gv8U  
 int Width=GetSystemMetrics(SM_CXSCREEN); "}Vow^vb  
 int Height=GetSystemMetrics(SM_CYSCREEN); K#kU6/  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ymiOtA Z  
 CDC tdc; *6?h,Dt L  
 tdc.CreateCompatibleDC(&dc); txw:m*(%  
 CBitmap*pOld=tdc.SelectObject(&bm); d@JjqE[  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); p~6/  
 tdc.SelectObject(pOld); { owK~  
 BITMAP btm; *shE-w ;C  
 bm.GetBitmap(&btm); 7X*$Fu<  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; U@ Y0 z.Y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ' cR||VX  
 BITMAPINFOHEADER bih; +:+q,0~*]  
 bih.biBitCount=btm.bmBitsPixel; ^9UKsy/q  
 bih.biClrImportant=0; HM /2/ /  
 bih.biClrUsed=0; Tq,Kel  
 bih.biCompression=0; }w}2'P'T  
 bih.biHeight=btm.bmHeight; buu~#m 1z  
 bih.biPlanes=1; &A)AV<=>T  
 bih.biSize=sizeof(BITMAPINFOHEADER); fucG 9B  
 bih.biSizeImage=size; h(l4\)  
 bih.biWidth=btm.bmWidth; Lk9X>`b#B  
 bih.biXPelsPerMeter=0; hRHqG  
 bih.biYPelsPerMeter=0; ;shhg z$  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); UJ* D  
 static int filecount=0; $F"'= +0  
 CString name; Qyx%:PE  
 name.Format("pict%04d.bmp",filecount++); =dSH8C"  
 name=m_Path+name; s]@()?.E$  
 BITMAPFILEHEADER bfh; b"DaLwKkz  
 bfh.bfReserved1=bfh.bfReserved2=0; L3/m}AH,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); | vL0}e  
 bfh.bfSize=54+size; jgNdcP  
 bfh.bfOffBits=54; 8lk@ev=O&  
 CFile bf; uxLT*,  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #eadkj #;  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ""q76cx  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 589hfET  
  bf.WriteHuge(lpData,size); Dukvi;\  
  bf.Close(); \"Jgs.  
  nCount++; "H\1Z,P<m  
 } %/iD@2r  
 GlobalFreePtr(lpData); ova4  
 if(nCount==1) cNOtfn6?F  
  m_Number.Format("%d picture captured.",nCount); ^h\& l{e  
 else  ~ "Xcd8:  
  m_Number.Format("%d pictures captured.",nCount); Zawnx=  
  UpdateData(FALSE); nI]8w6eCV  
} 0vR gmn  
|Lf>Z2E  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) tqbYrF)  
{ -|V1A[  
 if(pMsg -> message == WM_KEYDOWN) imw,Nb  
 { "%]<Co<S  
  if(pMsg -> wParam == VK_ESCAPE) ?"04u*u3  
   return TRUE; )}w2'(!X8  
  if(pMsg -> wParam == VK_RETURN) PgHe;^?j  
   return TRUE; j.or:nF  
 } 4~<78r5m  
 return CDialog::PreTranslateMessage(pMsg); c@f?0|66M  
} %n?&#_G|  
;GQCq@)-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0+S ;0  
{ lgrD~Y (x  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )<YfLDgTs  
  SaveBmp(); 6.5E d-  
  return FALSE; !r^fX=X>'  
} hNU$a?eVpR  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `st3iTLZY  
 CMenu pop; %[S-"k  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); t?1 b(oJ  
 CMenu*pMenu=pop.GetSubMenu(0); +q*WY*gX  
 pMenu->SetDefaultItem(ID_EXITICON); f[1 s4Dp3-  
 CPoint pt; 9!} ?}`'_  
 GetCursorPos(&pt); YOOcHo.F  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (:er~Y}  
 if(id==ID_EXITICON) lC.Q61J@  
  DeleteIcon(); dbga >j  
 else if(id==ID_EXIT) "t0l)P*C}  
  OnCancel(); 2nra@  
 return FALSE; VN3 [B eH  
} ^5E:hW [*  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ~t+T5`K  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) aFw \ w>*^  
 AddIcon(); 2P, %}Ms  
 return res; 2`dKnaF|  
} C*X=nezq  
ibP IT!5c  
void CCaptureDlg::AddIcon() 3ch<a0  
{ >:J7u*>$'  
 NOTIFYICONDATA data; S$N!Dj@e;  
 data.cbSize=sizeof(NOTIFYICONDATA); 8yCt(ms  
 CString tip; s@ 02 ?+/  
 tip.LoadString(IDS_ICONTIP); MoZ8A6e?B  
 data.hIcon=GetIcon(0); QJ\+u  
 data.hWnd=GetSafeHwnd(); qt{lZ_$  
 strcpy(data.szTip,tip); )WNw0cV}J>  
 data.uCallbackMessage=IDM_SHELL; M "\Iw'5$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~Vt?'v20@  
 data.uID=98; 8&Md=ZvK`  
 Shell_NotifyIcon(NIM_ADD,&data);  LA]UIM@  
 ShowWindow(SW_HIDE); i2P:I A|@  
 bTray=TRUE; TI/5'Oke$  
} ~Z`Cu~7  
'[Zgwz;z  
void CCaptureDlg::DeleteIcon() I3qTSX-  
{ I|x? K>  
 NOTIFYICONDATA data; $sxRRe m{?  
 data.cbSize=sizeof(NOTIFYICONDATA); 9 1.gE*D  
 data.hWnd=GetSafeHwnd(); N T>[ 2<  
 data.uID=98; 3p1U,B}  
 Shell_NotifyIcon(NIM_DELETE,&data); kk>z,A4 h_  
 ShowWindow(SW_SHOW); *$]50 \W  
 SetForegroundWindow(); u']}Z% A9`  
 ShowWindow(SW_SHOWNORMAL); p!o-+@ava  
 bTray=FALSE; {nPiIPH  
} v\lKY*@f  
Lm8uN?  
void CCaptureDlg::OnChange() ??#SQSU  
{ V_3K((P6  
 RegisterHotkey(); _I?oR.ON33  
} gb{8SG5ac  
:\Q#W4~p  
BOOL CCaptureDlg::RegisterHotkey() e_YTh^wU  
{ 6bDizS}  
 UpdateData(); dOT7;@   
 UCHAR mask=0; 7#&e0fw/I  
 UCHAR key=0; 8S` j6  
 if(m_bControl) ;w7s>(ITZ  
  mask|=4; h_HPmh5  
 if(m_bAlt) mY[*(a  
  mask|=2; yUjkRT&h  
 if(m_bShift) (u4'*[o\t  
  mask|=1; -}1TT@  
  key=Key_Table[m_Key.GetCurSel()]; MWv(/_b  
 if(bRegistered){ dY{qdQQ}  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8 =oUE$9  
  bRegistered=FALSE; 0qq>(K[  
 } qizQt]l  
 cMask=mask; Mt4*`CxtH;  
 cKey=key; k:F{U^!p|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [sNvCE$\]  
 return bRegistered; @#=yC.s  
} NTo[di\_  
<A(Bq'eQM  
  四、小结 !k Heslvi  
U7''; w  
  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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