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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: zX{ [Z  
  V\r5  
  一、实现方法 600-e;p  
BN|+2D+S  
  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: #T99p+O  
I}kx;!*b  
#pragma data_seg("shareddata") oz(<e  
HHOOK hHook =NULL; //钩子句柄 D ( <_1  
UINT nHookCount =0; //挂接的程序数目 dSS_^E[{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `Ft.Rwj2:m  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 BYqDC<Fq  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey qCc'w8A  
static int KeyCount =0; 4IG'T m  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 /H:'(W_b;  
#pragma data_seg() ,}=x8Xxr  
@Vr?)_ 0  
  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。 Hh(_sewo  
/=FQ {tLr  
  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: zX"@QB3E  
DHaSBk  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR HZ>Xm6DnC5  
cKey,UCHAR cMask) +s V$s]U  
{ R1! {,*Gy  
 BOOL bAdded=FALSE; V=H87 ^b  
 for(int index=0;index<MAX_KEY;index++){ sc@v\J;k  
  if(hCallWnd[index]==0){ s~6?p% 2]  
   hCallWnd[index]=hWnd; Hd U1gV>  
   HotKey[index]=cKey; DCACj-f  
   HotKeyMask[index]=cMask; `2o/W]SSk  
   bAdded=TRUE; c}U&!R2p{  
   KeyCount++; Y 'Yoc  
   break; C8m8ys  
  } }e9E+2}Z\  
 } c#<v:b  
 return bAdded; ([qw#!;w;  
} &s_[~g<  
//删除热键 x&8HBF'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S =U*is  
{ j I_TN5  
 BOOL bRemoved=FALSE; gLaFIeF<+  
 for(int index=0;index<MAX_KEY;index++){ l-Xxur5M'  
  if(hCallWnd[index]==hWnd){ `jSxq66L p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `9(TqcE  
    hCallWnd[index]=NULL; +w?RW^:Q=  
    HotKey[index]=0; 9F(<n  
    HotKeyMask[index]=0; 2ZNTj u7h  
    bRemoved=TRUE; <*i '  
    KeyCount--; 1ZJP.T`  
    break; ^.&2-#i  
   } Q$iYhR  
  } |O%`-2p]p  
 } </>;PnzE  
 return bRemoved; ssoIC  
} ]uI#4t~  
W~$YKBW  
wcspqC"_  
  DLL中的钩子函数如下: c*'D  
po}Jwx!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HpiP"Sl  
{ C:"Al-  
 BOOL bProcessed=FALSE; y[UTuFv~Q  
 if(HC_ACTION==nCode) npkE [JE:  
 { yEJ}!/  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 EEEYNu/4/  
   switch(wParam) ^%@(> :)0  
   {  ZxlQyr`~a(  
    case VK_MENU: U]riBlg>  
     MaskBits&=~ALTBIT; [[}KCND  
     break; QmvhmsDL  
    case VK_CONTROL: ArDkJ`DE  
     MaskBits&=~CTRLBIT; x=pq-&9>B  
     break; %G1kkcdH<  
    case VK_SHIFT: t|0Zpp;  
     MaskBits&=~SHIFTBIT; ^G.PdX$M  
     break; 2j9Mr  
    default: //judge the key and send message '2vZ%C$  
     break; ypM0}pdvTp  
   } f wWI2"}  
   for(int index=0;index<MAX_KEY;index++){ {9q~bt  
    if(hCallWnd[index]==NULL) ykrb/j|rK  
     continue; ng(STvSh:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (]n^_G#-$  
    { 8_US.52V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); dE=4tqv-r  
     bProcessed=TRUE; ]R~K-cN`  
    } _w/w~;7  
   } ijOUv6=-  
  } ma)Y@Uw M  
  else if((lParam&0xc000ffff)==1){ //有键按下 Q|q.~x<RQ  
   switch(wParam) CvW*/d q  
   { e|Rd#  
    case VK_MENU: _&_#uV<WG0  
     MaskBits|=ALTBIT; 6nV]Ec~3[  
     break; ~L)9XK^15  
    case VK_CONTROL: sPuNwVX>}I  
     MaskBits|=CTRLBIT; 8<#X]I_eP+  
     break; W-ErzX  
    case VK_SHIFT: 5(R ./  
     MaskBits|=SHIFTBIT; 1K.i>]}>  
     break; Q%o:*(x[O  
    default: //judge the key and send message *~~ >?  
     break; u )cc  
   } g)c<\%  
   for(int index=0;index<MAX_KEY;index++){ J8>y2rAi  
    if(hCallWnd[index]==NULL) [1K\ _  
     continue; _]E H~;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M@ILB-H  
    { bq#*XCt#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?s/]k#H  
     bProcessed=TRUE; \yP\@cpY{  
    } ` 1aEV#;  
   } 4jMC E&<  
  } = s^KZV  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D=uU:7m  
   for(int index=0;index<MAX_KEY;index++){ W'WZ@!!  
    if(hCallWnd[index]==NULL) >|Ps23J#  
     continue; mxUM&`[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  0IO#h{t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %2>ya>/M  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 b3]QH h/  
   } V`Ve__5;  
  } QS.t_5<U  
 } R3=PV{`M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z2p@d1  
}  n aE;f)  
Plpt7Pa_  
  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: OtK=UtVI  
Qv=F'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &cy @Be}|T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $KDH"J  
v53qpqc  
  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: )1f8 H,q^  
$]O;D~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) IjJO;  
{ hS(}<B{x!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;.*n77Y  
 { cZ>h[XX[  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6%'bo`S#  
  SaveBmp(); b3Nr>(Z<}  
  return FALSE; (<y~]igy  
 } Wl!|+-  
 …… //其它处理及默认处理 +JQ/DNv  
} #{97<sU\  
;.Dm?J0  
NJ" d`  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 YMGzO  
iBlZw%zKP  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 gr]:u4}  
Z*,Nt6;e  
  二、编程步骤 /q.iUwSK>  
ks{y=@ <,  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; jvGGIb"&1  
}@VdtH  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; xz9x t  
Q#+y}pOLP  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; |#uA(V  
ZV:cg v  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; !2]eVO  
BT[jD}?  
  5、 添加代码,编译运行程序。 E RnuM  
V)HX+D>  
三、程序代码 bo>4:i  
QPL6cU$&R  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Q:U^):~  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) o u%Xnk~  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "DWw]\xO](  
#if _MSC_VER > 1000 }V@ * :3w8  
#pragma once #ZFedK0vv  
#endif // _MSC_VER > 1000 cu)ssT  
#ifndef __AFXWIN_H__ $?voQ&  
#error include 'stdafx.h' before including this file for PCH k5s8s@  
#endif SEf:u  
#include "resource.h" // main symbols +@n8DM{b  
class CHookApp : public CWinApp 1Z. D3@  
{ kX0hRX  
 public: OC(S"&D  
  CHookApp(); P~"e=NL5  
  // Overrides OHEl.p]|  
  // ClassWizard generated virtual function overrides B;[ai?@c(_  
  //{{AFX_VIRTUAL(CHookApp) e|6kgj3/  
 public: |:yWDZg[  
  virtual BOOL InitInstance(); ;"d>lyL  
  virtual int ExitInstance(); O7]p `Xi8  
  //}}AFX_VIRTUAL A"yiXc-N~\  
  //{{AFX_MSG(CHookApp) 0Yh Mwg?  
  // NOTE - the ClassWizard will add and remove member functions here. 0[\^Y<ec  
  // DO NOT EDIT what you see in these blocks of generated code ! osBwX.G'l  
  //}}AFX_MSG \w;d4r8x  
  DECLARE_MESSAGE_MAP() ;F)j,Ywi)H  
}; G&eRhif  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); LIm{Y`XU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <FaF67[Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8XS_I{}?  
BOOL InitHotkey(); nTy8:k']  
BOOL UnInit(); V'-}B6 3S>  
#endif 7EI5w37  
%9^^X6yLM  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. > T$M0&<  
#include "stdafx.h" ^( w%m#  
#include "hook.h" 5uo?KSX%  
#include <windowsx.h> V*}xlxSL  
#ifdef _DEBUG !]^,!7x,8j  
#define new DEBUG_NEW #pe#(xoI  
#undef THIS_FILE RB,`I#z1f  
static char THIS_FILE[] = __FILE__; @ PboT1  
#endif /Qa'\X,f3  
#define MAX_KEY 100 yniXb2iM  
#define CTRLBIT 0x04 lKtA.{(  
#define ALTBIT 0x02 1KHFzx,  
#define SHIFTBIT 0x01 \3WF-!xe  
#pragma data_seg("shareddata") fN!ci']  
HHOOK hHook =NULL; :NHP,"  
UINT nHookCount =0; *-.{->#Y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ||xiKg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT C[4{\3\Va  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SC Qr/Q  
static int KeyCount =0; [osIQ!u;:  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift X-lB1uq^  
#pragma data_seg() e1Ne{zg~  
HINSTANCE hins; rAv)k&l  
void VerifyWindow(); PUU "k:{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) QsO%m  
//{{AFX_MSG_MAP(CHookApp) \/wbk`2  
// NOTE - the ClassWizard will add and remove mapping macros here. sxP1. = W  
// DO NOT EDIT what you see in these blocks of generated code! vO?\u`vY  
//}}AFX_MSG_MAP }|KNw*h $  
END_MESSAGE_MAP() @zQ.d{  
d ynq)lf  
CHookApp::CHookApp() 5{PT  
{ /i[1$/*  
 // TODO: add construction code here, 88]4 GVi  
 // Place all significant initialization in InitInstance NZ|(#` X  
} bXiOf#:''  
k}0Y&cT!rU  
CHookApp theApp; 3QD+&9{D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) qcmf*Yl:v  
{ [. rULQl  
 BOOL bProcessed=FALSE; iNlY\67sW  
 if(HC_ACTION==nCode) 2#i*'.  
 { j\LJ{?;jC  
  if((lParam&0xc0000000)==0xc0000000){// Key up B(eC|:w[z  
   switch(wParam) *wfb~&: }  
   { Y<ZaW{%  
    case VK_MENU: g"KH~bN  
     MaskBits&=~ALTBIT; ]"wl*$N  
     break; 8@)4)+e  
    case VK_CONTROL: #;+ABV  
     MaskBits&=~CTRLBIT; '5usPD  
     break; ]Yw/}GKB  
    case VK_SHIFT: G`D~OI  
     MaskBits&=~SHIFTBIT; [ Q@rW5,-  
     break; _aaQ1A`p  
    default: //judge the key and send message KUE}^/%z  
     break; G/)]aGr  
   } )<~v~|re  
   for(int index=0;index<MAX_KEY;index++){ \]Nt-3|`0  
    if(hCallWnd[index]==NULL) E!s?amM4  
     continue; R(1N]>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rLKwuZ  
    { *LZB.84  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); FD1Z}v!5IJ  
     bProcessed=TRUE; =O.%)|  
    } H\PY\O&cP  
   } *7JsmN?  
  } -(;<Q_'s{"  
  else if((lParam&0xc000ffff)==1){ //Key down ; *ZiH%q,  
   switch(wParam) n N_Ylw  
   { 9w:F_gr  
    case VK_MENU: fZ6-ap,u  
     MaskBits|=ALTBIT; QnZ7e#@UP  
     break; l&2pUv=  
    case VK_CONTROL: ,zP.ch0K  
     MaskBits|=CTRLBIT; 32S5Ai@Cd"  
     break; &*\-4)Tf  
    case VK_SHIFT: 'CfM'f3uu  
     MaskBits|=SHIFTBIT; `pJWZ:3  
     break; B/^1uPTZ71  
    default: //judge the key and send message wBJP8wES=  
     break; c]x'}K c  
   } Y+ Qm.  
   for(int index=0;index<MAX_KEY;index++) 4k]DktY}.  
   { V."qxKsz  
    if(hCallWnd[index]==NULL) qt.Y6s:r_  
     continue; dBeZx1Dy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |bM?Q$>~  
    { Cvgk67C=$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); y88lkV4a  
     bProcessed=TRUE; 9x]yu6  
    } a*N<gId  
   } {0IC2jE  
  } xE"QX N  
  if(!bProcessed){ FWb`F&  
   for(int index=0;index<MAX_KEY;index++){ P. >5`^  
    if(hCallWnd[index]==NULL) M>xjs?{%k  
     continue; < cUaIb;(4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G?e\w+}Pj@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qy^sdqHl@  
   } 92";?Xk  
  } fnJ!~b*qo  
 } YsBOh{Ml  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "3H?_!A9  
} Od?b(bE.]  
][[\!og  
BOOL InitHotkey() 9bb 5?b/  
{ L>X39R~  
 if(hHook!=NULL){ VUbg{Rb)  
  nHookCount++; k0>]7t$L  
  return TRUE; 8)m  
 } wF.S ,|  
 else *D:"I!Ho  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &`}8Jz=S  
  if(hHook!=NULL) T/YvCbo  
   nHookCount++; IPxK$nI^  
  return (hHook!=NULL); `U6bI`l  
} H vezi>M  
BOOL UnInit() '"4S3Fysm  
{ ^1jZwP;5eW  
 if(nHookCount>1){ Lk8NjK6  
  nHookCount--; YYi:d=0<SO  
  return TRUE; mcm8|@Y{  
 } us2RW<Oxv  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 4/+P7.}ea-  
 if(unhooked==TRUE){ ?]Wg{\NC6  
  nHookCount=0; =.9uuF:  
  hHook=NULL; /)LI1\ o  
 } r)/nx@x  
 return unhooked; :dM eNM-  
} O~L/>Ya  
iI@m e=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {T(z@0Xu  
{  0%OV3`  
 BOOL bAdded=FALSE; vN8Xq+  
 for(int index=0;index<MAX_KEY;index++){ >6\rhx>  
  if(hCallWnd[index]==0){ 7w8I6  
   hCallWnd[index]=hWnd; F =Zc_  
   HotKey[index]=cKey; d :%!)s  
   HotKeyMask[index]=cMask; 3B6"T;_  
   bAdded=TRUE; laX67Vjv  
   KeyCount++; )m4O7'2G  
   break; o?]g  
  } IHaNg K2  
 } S1Ql%Yk-(  
 return bAdded; Wti?J.Csc  
} Au[H!J  
G&f~A;'7k  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) go[(N6hN  
{ X{-[ E^X  
 BOOL bRemoved=FALSE; Vv<Tjr  
 for(int index=0;index<MAX_KEY;index++){ hn p-x3  
  if(hCallWnd[index]==hWnd){ =0gfGwD{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ - )brq3L  
    hCallWnd[index]=NULL; -< RG'I~  
    HotKey[index]=0; S mjg[  
    HotKeyMask[index]=0; 48t_?2>  
    bRemoved=TRUE; 4&a,7uVer  
    KeyCount--; gsD0N^  
    break;  aa10vV  
   } ^N2N>^'&1.  
  } .V'=z|   
 } ~V?3A/]  
 return bRemoved; #fTPo:*t  
} Ej7>ywlW  
tc4"huG  
void VerifyWindow() TLC&@o :  
{ qt&zo5  
 for(int i=0;i<MAX_KEY;i++){ c=Y8R/G<  
  if(hCallWnd!=NULL){ " +n\0j;  
   if(!IsWindow(hCallWnd)){ fD:>cje  
    hCallWnd=NULL; Eg;xj@S<2  
    HotKey=0; n>["h2  
    HotKeyMask=0; Or9`E(  
    KeyCount--; q(YFt*(;w  
   } A=a~ [vre  
  } o;\c$|TNU  
 } :!nBTw  
} cV+ x.)a.  
w\f>.N  
BOOL CHookApp::InitInstance() kV$$GLD\  
{ Ohe* m[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); WG\gf\=I  
 hins=AfxGetInstanceHandle(); Wgr`)D  
 InitHotkey(); 3.vQ~Fvl  
 return CWinApp::InitInstance(); (}:n#|,{M  
} o 2Okc><z  
Y#[>j4<T  
int CHookApp::ExitInstance() bo%v(  
{ oY$L  
 VerifyWindow(); oPVyLD  
 UnInit(); D3i`ehh  
 return CWinApp::ExitInstance(); 5lp};  
} IQ3]fLb  
^>H+#@R  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xM6v0Ua  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #{]Yw}m  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ UvPD/qu$8D  
#if _MSC_VER > 1000 3Q-[)Z )  
#pragma once j^&{5s  
#endif // _MSC_VER > 1000 ;?`l1:C5)  
|m5 E%E  
class CCaptureDlg : public CDialog V`;$Ua;y  
{ MaX:o GF,  
 // Construction zC[lPABQ  
 public: -jJw wOm  
  BOOL bTray; <GthJr>1D  
  BOOL bRegistered; 5PXo1"n8T  
  BOOL RegisterHotkey(); Q[U_ 0O,A9  
  UCHAR cKey; |loo ^!I  
  UCHAR cMask; x22:@Ot6  
  void DeleteIcon(); AT6:&5_`  
  void AddIcon(); Jfkdiyy"  
  UINT nCount; n$S`NNO{]  
  void SaveBmp(); *gxo! F}  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor pPX~pPIj2  
  // Dialog Data = e>#oPH  
  //{{AFX_DATA(CCaptureDlg) Y3J;Kk#AH  
  enum { IDD = IDD_CAPTURE_DIALOG }; "Nx3_mQ  
  CComboBox m_Key; A7SE>e>  
  BOOL m_bControl; EE<^q?[3^  
  BOOL m_bAlt; /e0cx:.w  
  BOOL m_bShift; qauZ-Qoc9  
  CString m_Path; QaMB=wVr  
  CString m_Number; AHA4{Zu[  
  //}}AFX_DATA l*+5WrOS  
  // ClassWizard generated virtual function overrides _P]!J~$5  
  //{{AFX_VIRTUAL(CCaptureDlg) ZJ7<!?6  
 public: xO<$xx  
  virtual BOOL PreTranslateMessage(MSG* pMsg); (3;dtp>Xx  
 protected: .}V&*-ep  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,%a7sk<5k  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); .;'3Roi  
  //}}AFX_VIRTUAL  t=;84lA  
  // Implementation uKBSv*AM  
 protected: lv* fK  
  HICON m_hIcon; V>2mz c  
  // Generated message map functions 0B;cQSH!q  
  //{{AFX_MSG(CCaptureDlg) s, 8a1o  
  virtual BOOL OnInitDialog(); G\U'_G>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); b35Z1sfD j  
  afx_msg void OnPaint(); SB3= 5"q  
  afx_msg HCURSOR OnQueryDragIcon(); YsHZFF  
  virtual void OnCancel(); (DW[#2\.  
  afx_msg void OnAbout(); ZSu0e%  
  afx_msg void OnBrowse(); xq2 ,S  
  afx_msg void OnChange(); ca!=D $  
 //}}AFX_MSG v FL\O  
 DECLARE_MESSAGE_MAP() <R?_Yjsw  
}; (Wm4JmX%  
#endif <%2A, Vz"  
EpO5 _T_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -a}d @&  
#include "stdafx.h" UW%.G  
#include "Capture.h" gtBnP~zT\B  
#include "CaptureDlg.h" Ve1O<i  
#include <windowsx.h> T|c9Swu r  
#pragma comment(lib,"hook.lib") 2+Tu"oG;rB  
#ifdef _DEBUG 0{ O|o_  
#define new DEBUG_NEW y<<:6OBj  
#undef THIS_FILE H$/r{gfg^  
static char THIS_FILE[] = __FILE__; +gQn,HX  
#endif tv+H4/  
#define IDM_SHELL WM_USER+1 N~%F/`Z<+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gDmwJr  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V|h/a\P  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $6c8<!B_  
class CAboutDlg : public CDialog l]s,CX  
{ ^:0e pj7  
 public: H9^DlIv('  
  CAboutDlg(); 2A+I8/zRG  
  // Dialog Data *1Lkde@|{  
  //{{AFX_DATA(CAboutDlg) f8DF>]WW  
  enum { IDD = IDD_ABOUTBOX }; RtR5ij1  
  //}}AFX_DATA dtdz!'q)Y  
  // ClassWizard generated virtual function overrides |^ao,3h#  
  //{{AFX_VIRTUAL(CAboutDlg) .i7bI2^  
 protected: ^r7-|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Nz ,8NM]  
  //}}AFX_VIRTUAL +U%U3tAvs  
  // Implementation H@uCbT  
 protected: u,d@ oF(=  
  //{{AFX_MSG(CAboutDlg) r] +V:l3  
  //}}AFX_MSG <V3N!H_d  
  DECLARE_MESSAGE_MAP() s57-<&@J9  
}; @CSTp6{y  
#NAlje(7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 95,{40;X7  
{  4I> I  
 //{{AFX_DATA_INIT(CAboutDlg) 9Fl}"p[>L.  
 //}}AFX_DATA_INIT rSYzrVc  
} ?\QEK  
~ "] 6  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8%UI<I,  
{ O^D$ ~ ]  
 CDialog::DoDataExchange(pDX); LN8V&'>  
 //{{AFX_DATA_MAP(CAboutDlg) O1.a=O  
 //}}AFX_DATA_MAP Om% 9 x  
} +M+ht  
axl!zu*  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) CL^MIcq?  
 //{{AFX_MSG_MAP(CAboutDlg) {5f? y\Z  
 // No message handlers #Fua^]n  
 //}}AFX_MSG_MAP }NMkL l]J  
END_MESSAGE_MAP() y s5b34JN  
"e4hPY#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %}U-g"I  
: CDialog(CCaptureDlg::IDD, pParent) x}.Q9L  
{ s^nwF>  
 //{{AFX_DATA_INIT(CCaptureDlg) MSm vQ  
  m_bControl = FALSE; 4MVa[ 0Y  
  m_bAlt = FALSE; <uugT9By  
  m_bShift = FALSE; QY,.|  
  m_Path = _T("c:\\"); JNzNK.E!m-  
  m_Number = _T("0 picture captured."); mW_<c,3D.  
  nCount=0; /"t*gN=wrF  
  bRegistered=FALSE; x,\PV>   
  bTray=FALSE; a*}ZT,V  
 //}}AFX_DATA_INIT Z=sCYLm  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 t(4%l4i;X  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); OBF2?[V~  
} %bnDxCj"  
,zy4+GW  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $1N_qu  
{ .1u"16_  
 CDialog::DoDataExchange(pDX); <;d?E%`  
 //{{AFX_DATA_MAP(CCaptureDlg) 93|u. @lEy  
  DDX_Control(pDX, IDC_KEY, m_Key); ;4E0%@R  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); q%=`PCty  
  DDX_Check(pDX, IDC_ALT, m_bAlt); $/%|0tQ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); jUq^$+N  
  DDX_Text(pDX, IDC_PATH, m_Path); /@5X0m  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #c5 NFU}9  
 //}}AFX_DATA_MAP C3af>L@}  
} =GpO }t">  
a;eV&~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) A L#"j62  
//{{AFX_MSG_MAP(CCaptureDlg) <_@ S@t)  
 ON_WM_SYSCOMMAND() .(tga&]  
 ON_WM_PAINT() J9^RP~>bs  
 ON_WM_QUERYDRAGICON() ,z1X{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7FMg6z8~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) odPq<'V|AY  
 ON_BN_CLICKED(ID_CHANGE, OnChange) [-cYFdt"V  
//}}AFX_MSG_MAP 3&!X8Lhv  
END_MESSAGE_MAP() C,R_` %b%  
3u7^*$S  
BOOL CCaptureDlg::OnInitDialog() /JL2dBy#z  
{ d18%zY>  
 CDialog::OnInitDialog(); @ oE [!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9l?#ZuGXp  
 ASSERT(IDM_ABOUTBOX < 0xF000); O $uXQ.r  
 CMenu* pSysMenu = GetSystemMenu(FALSE); B:=*lU.n  
 if (pSysMenu != NULL) ~A+D H  
 { m!s/L,iJJ  
  CString strAboutMenu; $-m`LF@  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 6elmLDMni\  
  if (!strAboutMenu.IsEmpty()) *5iNw_&  
  { C6=7zYhR  
   pSysMenu->AppendMenu(MF_SEPARATOR); F8km8lPQl  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); X8Px  
  } N3Ub|$}q  
 } mh>)N"  
 SetIcon(m_hIcon, TRUE); // Set big icon 5V\\w~&/  
 SetIcon(m_hIcon, FALSE); // Set small icon 2HBYReQ  
 m_Key.SetCurSel(0); UBp0;)-  
 RegisterHotkey(); >ZKE  
 CMenu* pMenu=GetSystemMenu(FALSE); yz!j9pJ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); IiV:bHUE}0  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); p%_#"dkC7  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s5>=!yX  
 return TRUE; // return TRUE unless you set the focus to a control 6X5`npf  
} Hd6g0  
[ "}0umt  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) R=~+-^O!  
{ -tWkN^j8+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^1M:wX r  
 { XCO{}wU)>  
  CAboutDlg dlgAbout;  L2[|g~  
  dlgAbout.DoModal(); KwOn<0P  
 } dV<|ztv  
 else ;Y#~2eYCz  
 { :e:jILQ[  
  CDialog::OnSysCommand(nID, lParam); ~HsPYc8Fz  
 } s`ly#+!.  
} p`-`(i=iJo  
}zi:nSpON  
void CCaptureDlg::OnPaint() M@S6V7  
{ CF3Z`xD  
 if (IsIconic()) }wrZP}zM>  
 { ,{A-<=6t  
  CPaintDC dc(this); // device context for painting bS _!KU  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); jQOY\1SR  
  // Center icon in client rectangle ` /JJ\`Pu  
  int cxIcon = GetSystemMetrics(SM_CXICON); mmm025.   
  int cyIcon = GetSystemMetrics(SM_CYICON); ,p/iN9+Z  
  CRect rect; 6|3$43J,F  
  GetClientRect(&rect); ~M%r.WFpA  
  int x = (rect.Width() - cxIcon + 1) / 2; ,2vPmff  
  int y = (rect.Height() - cyIcon + 1) / 2; stz1e dP  
  // Draw the icon  L3P_  
  dc.DrawIcon(x, y, m_hIcon); =NwmhV  
 } Me[T=Tt`@w  
 else .Ya]N+r*  
 { %B` MO-  
  CDialog::OnPaint(); &GcWv+p  
 } zr%lBHuW  
} #q40  >)]  
?"\`u;  
HCURSOR CCaptureDlg::OnQueryDragIcon() v bzeabm  
{ ipnvw4+  
 return (HCURSOR) m_hIcon; .?9+1.`  
} {XiBRs e  
 Ok[y3S  
void CCaptureDlg::OnCancel() GEXT8f(7  
{ g,U~3#   
 if(bTray) MjNCn&c  
  DeleteIcon(); %>}6>nT#  
  CDialog::OnCancel(); 7%L%dyN  
} lq=| =  
fD#|C~:=  
void CCaptureDlg::OnAbout() :; \>jxA  
{ cAIMt]_  
 CAboutDlg dlg; :-7`Lfi@%  
 dlg.DoModal(); 'WkDp a  
} l~Je ]Qt  
;LNFPo   
void CCaptureDlg::OnBrowse() :Eq=wbAw  
{ 1tU}}l  
 CString str; *_}|EuY  
 BROWSEINFO bi; 8;/`uB:zV  
 char name[MAX_PATH]; )h&s.k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); bvzeU n  
 bi.hwndOwner=GetSafeHwnd(); h" cLZM:6  
 bi.pszDisplayName=name; :ak D  
 bi.lpszTitle="Select folder"; gP1~N^hke]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; pzmm cjEC  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); \](IBI:  
 if(idl==NULL) O{rgx~lLJt  
  return; [R-4e; SRh  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); kVE% "  
 str.ReleaseBuffer(); ww82)m8  
 m_Path=str; t=J\zyX!  
 if(str.GetAt(str.GetLength()-1)!='\\') 2KMLpO&De  
  m_Path+="\\"; |5S/h{gq  
 UpdateData(FALSE); @kC>+4s!  
} >K**SjVG  
i X qB-4"  
void CCaptureDlg::SaveBmp() aW]!$  
{ !xyO  
 CDC dc; Au &NQ+  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Ffk$8"   
 CBitmap bm; Rq~\Yf+Pm  
 int Width=GetSystemMetrics(SM_CXSCREEN); #=UEx  
 int Height=GetSystemMetrics(SM_CYSCREEN); -~ytk=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Y%:FawR  
 CDC tdc; <T{2a\i 4f  
 tdc.CreateCompatibleDC(&dc); )nU%}Z  
 CBitmap*pOld=tdc.SelectObject(&bm); Fv=7~6~  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bs$x%CR  
 tdc.SelectObject(pOld); jC> l<d_  
 BITMAP btm; rXXIpQRi$S  
 bm.GetBitmap(&btm); [,)yc/{*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; HB yk 1  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); YP{)jAK  
 BITMAPINFOHEADER bih; @54,I  
 bih.biBitCount=btm.bmBitsPixel; X~t]qT  
 bih.biClrImportant=0; XH&Fn+  
 bih.biClrUsed=0; 3>qUYxG8  
 bih.biCompression=0; cGiS[-g  
 bih.biHeight=btm.bmHeight; jca7Cx`sm  
 bih.biPlanes=1; yHkZInn  
 bih.biSize=sizeof(BITMAPINFOHEADER); Yi1* o?  
 bih.biSizeImage=size; L+2!Sc,>  
 bih.biWidth=btm.bmWidth;  ::Y   
 bih.biXPelsPerMeter=0; ~Fv&z'R  
 bih.biYPelsPerMeter=0; vUl5%r2O4  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); J8I_tF6  
 static int filecount=0; |4//%Ll/  
 CString name; g9(zJ  
 name.Format("pict%04d.bmp",filecount++); eSf e s  
 name=m_Path+name; x;" !  
 BITMAPFILEHEADER bfh; ;mH1J'.(a  
 bfh.bfReserved1=bfh.bfReserved2=0; ]^MOFzSz~  
 bfh.bfType=((WORD)('M'<< 8)|'B'); dk~h  
 bfh.bfSize=54+size; 0mo^I==J1  
 bfh.bfOffBits=54; fI(u-z~,  
 CFile bf; +N1oOcPC>C  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?F'gh4  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); y]Q G;  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); hWpn~q  
  bf.WriteHuge(lpData,size); '(A)^K>+  
  bf.Close(); T0n=nC}<  
  nCount++; %\#s@8=2u  
 } J&UFP{)  
 GlobalFreePtr(lpData); |1J=wp)#  
 if(nCount==1) }LQ*vD-Jj  
  m_Number.Format("%d picture captured.",nCount); q#wg2  
 else ?T-6|vZA  
  m_Number.Format("%d pictures captured.",nCount); OJ$169@;  
  UpdateData(FALSE); X_|W#IM*+  
} %\PnsnJ9Q  
6#VG,'e3  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Okm&b g  
{ QA7SQ cd,  
 if(pMsg -> message == WM_KEYDOWN) eA9U|&o  
 { <Ur(< WTV  
  if(pMsg -> wParam == VK_ESCAPE) E< nXkqD  
   return TRUE; |VM c,_D  
  if(pMsg -> wParam == VK_RETURN)  s#om  
   return TRUE; Kd^{~Wlz&z  
 } ,\Gn  
 return CDialog::PreTranslateMessage(pMsg); 6$[7t?u  
} Bmuf[-}QW  
FrD.{(/~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f 'aQ T  
{ M$ g%kqa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ (;YO]U4  
  SaveBmp(); ' 8`{u[:  
  return FALSE; I$0JAy  
} 7onMKMktM%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Xm`s=5%  
 CMenu pop; I7b(fc-r  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ZxkX\gl91  
 CMenu*pMenu=pop.GetSubMenu(0); )}L*8 LV  
 pMenu->SetDefaultItem(ID_EXITICON); YAnt}]u!"  
 CPoint pt; M iIH&z  
 GetCursorPos(&pt); q:sDNj)R\  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 6W$ #`N>  
 if(id==ID_EXITICON) 9PhdoREb  
  DeleteIcon();  !J!zi  
 else if(id==ID_EXIT) 1) V,>)Ak  
  OnCancel(); Y'"2s~_ Z  
 return FALSE; h-hU=I8  
} hKjvD.6]%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6'ye-}vD-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) WmLl.Vv=  
 AddIcon(); b1{~j]"$L  
 return res; +(3"XYh  
} ; iQ@wOL]  
{LTb-CB  
void CCaptureDlg::AddIcon() Qfo'w%px  
{ H4 Y7p  
 NOTIFYICONDATA data; :Bp{yUgi@  
 data.cbSize=sizeof(NOTIFYICONDATA); M`\c'|i/  
 CString tip; '"QC^Joz  
 tip.LoadString(IDS_ICONTIP); {n%-^9b1{&  
 data.hIcon=GetIcon(0); "{;]T  
 data.hWnd=GetSafeHwnd(); AWC zu5ve  
 strcpy(data.szTip,tip); ^T"9ZBkb  
 data.uCallbackMessage=IDM_SHELL; uHBX}WH  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; t+Mr1e  
 data.uID=98; XP5q4BM  
 Shell_NotifyIcon(NIM_ADD,&data); =:`1!W0I  
 ShowWindow(SW_HIDE); T_Q/KhLU  
 bTray=TRUE; 3 2Q/4  
} [YP8z~  
A@*P4E`xp  
void CCaptureDlg::DeleteIcon()  w_G/[R3  
{ ,$5;  
 NOTIFYICONDATA data; nS[0g^}  
 data.cbSize=sizeof(NOTIFYICONDATA); b_ Sh#d&  
 data.hWnd=GetSafeHwnd(); 0TU~Q  
 data.uID=98; udB:ys  
 Shell_NotifyIcon(NIM_DELETE,&data); nk9hQRP? 8  
 ShowWindow(SW_SHOW); *{tn/ro6a  
 SetForegroundWindow(); a{Y:hrd:Z  
 ShowWindow(SW_SHOWNORMAL); DCX 4!,ZF  
 bTray=FALSE; @I}:HiF  
} * b>W  
]g3&gw  
void CCaptureDlg::OnChange() k#`.!yI,  
{ O]w&uim  
 RegisterHotkey(); W5}.WFu  
} jEklf0Z  
hbR;zV|US  
BOOL CCaptureDlg::RegisterHotkey() ~$#DB@b  
{ f[ GH  
 UpdateData(); MUz.-YRt  
 UCHAR mask=0; oLk>|J  
 UCHAR key=0; a}`4BMi3  
 if(m_bControl) UY j  
  mask|=4; JI )+  
 if(m_bAlt) 1 Y@6oT  
  mask|=2; gj\r>~S  
 if(m_bShift) ;3Fgy8 T  
  mask|=1; eB/3MUz1  
  key=Key_Table[m_Key.GetCurSel()]; S+|aCRS  
 if(bRegistered){ k]Y+C@g  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); h3a HCr E  
  bRegistered=FALSE; ru3nnF_I  
 } s['F?GWg  
 cMask=mask; JO5~Vj_"  
 cKey=key; ]eb9Fq:N7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); E& T9R2Y  
 return bRegistered; *La*j3|:  
} dGQxGt1  
`kyr\+hp  
  四、小结 ^SxB b,\  
eznw05U  
  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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