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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: h?b{{  
  sq%f%?(V  
  一、实现方法 F&Gb[Q&a8  
!Kis,e  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: Tr8+E;;  
MB)xL-jO  
#pragma data_seg("shareddata") qr*/}F6  
HHOOK hHook =NULL; //钩子句柄 A8?>V%b[Y  
UINT nHookCount =0; //挂接的程序数目 ?$?Ni)Z  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 8[k-8h|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 XxGm,A+>Ty  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @RC_Ie=#)  
static int KeyCount =0; {_Y\Y&#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 u=4Rn  
#pragma data_seg() 1DX=\BWp  
9Ah4N2nL-b  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 h(9K7  
jH8F^KJM[  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: B`vV[w?  
}\@*A1*X2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ~HELMS~-  
cKey,UCHAR cMask) Vrnx# j-U  
{ [W2k#-%G  
 BOOL bAdded=FALSE; #q\C"N5ip  
 for(int index=0;index<MAX_KEY;index++){ uwbj`lpf  
  if(hCallWnd[index]==0){ pCq{F*;  
   hCallWnd[index]=hWnd; 'F@'4[uda  
   HotKey[index]=cKey; 9]Y@eRI<  
   HotKeyMask[index]=cMask; }} IvZG&  
   bAdded=TRUE; &0 @2JS/!  
   KeyCount++; \t}!Dr+yN  
   break; 4 1Ru@  
  } /h_BF\VBs  
 } H)5]K9D  
 return bAdded; P%1s6fjU  
} rA9"CN  
//删除热键 {9z EnVfg  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kWgxswl7H  
{ s>kzt1,x  
 BOOL bRemoved=FALSE; qp7>_B  
 for(int index=0;index<MAX_KEY;index++){ +;vfn>^!b  
  if(hCallWnd[index]==hWnd){ -G{}8GM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ WKN\* N<  
    hCallWnd[index]=NULL; ,ujoGSx}  
    HotKey[index]=0; 1:8ZS  
    HotKeyMask[index]=0; uoF9&j5E@Z  
    bRemoved=TRUE; U:_&aY_  
    KeyCount--; +~7@K{6 q-  
    break; *r%=p/oQ}B  
   } s{gdTG6v`  
  } z7NaW e  
 } !bQ5CB  
 return bRemoved; *C$ W^u5h  
} u{HB5QqK  
^!=+$@<  
Pj^6.f+  
  DLL中的钩子函数如下: D{ c`H}/`  
6%:N^B=%}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }E*#VA0/nY  
{ /KH3v!G0  
 BOOL bProcessed=FALSE; lE /"  
 if(HC_ACTION==nCode) euQ d  
 { u"nyx0<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 X mLHZ,/  
   switch(wParam) |XPT2eQ{  
   {  ]@Q14   
    case VK_MENU: \T>f+0=4  
     MaskBits&=~ALTBIT; gzxLHPiw  
     break; jytfGE:  
    case VK_CONTROL: DT;Hr4Z8^"  
     MaskBits&=~CTRLBIT; YYN= `ST  
     break; p^NYJV  
    case VK_SHIFT: !RAyUfS  
     MaskBits&=~SHIFTBIT; #k*e>d$  
     break; T~_+\w  
    default: //judge the key and send message AS~O*(po  
     break; "|(+~8[  
   } s@Y0"   
   for(int index=0;index<MAX_KEY;index++){ hK?uGt d?  
    if(hCallWnd[index]==NULL) >tYptRP  
     continue; L=?Yc*vg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y1B3F5  
    { $yBU ,lu}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Jk 0 ;<2j  
     bProcessed=TRUE; x%5n&B  
    } %3|0_  
   } Y}Y2 Vx  
  } wYPJji D  
  else if((lParam&0xc000ffff)==1){ //有键按下 vQ$FMKz7  
   switch(wParam) vA*!82  
   { {O[a +r.n  
    case VK_MENU: {b}Ri&oEOH  
     MaskBits|=ALTBIT; )L<NW{  
     break; C5$1K'X@  
    case VK_CONTROL: [g`P(?  
     MaskBits|=CTRLBIT; >iDV8y  
     break; Y7{IF X  
    case VK_SHIFT: N[~ RWg  
     MaskBits|=SHIFTBIT;  km|;T!  
     break; D<$, v(-  
    default: //judge the key and send message ia?{]!7$  
     break; \GO^2&g(  
   } [2"a~o\  
   for(int index=0;index<MAX_KEY;index++){ %A|9=x*  
    if(hCallWnd[index]==NULL) kFg@|#0v9  
     continue; /PafIq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]6bh#N;.  
    { |Ah'KpL8W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T@ (MSgp9  
     bProcessed=TRUE; p8aGM-+40W  
    } ^~'tQ}]!"  
   } G~5EAeG  
  } <b.?G  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 B4Ko,=pg  
   for(int index=0;index<MAX_KEY;index++){ UzTFT:\  
    if(hCallWnd[index]==NULL) R*|y:T,H  
     continue; ?Z 9C}t]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) CoO..  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?%-VSL>$w=  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~)xg7\k  
   } I|8'#QX  
  } -.<fGhmU  
 } R/Y9t8kk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6[b'60CuZL  
} .0+=#G>  
a|?&  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: t.Q}V5t{g  
Fjch<gAofS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X67^@~l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jGy%O3/  
z=%&?V  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: je LRS8];  
Lu?MRF f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5ar2Y$bY  
{ qw?#~"Ca.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Ya~*e;CW2  
 { 6bPoC$<Z  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 {;mT.[  
  SaveBmp(); 9bu}@#4*  
  return FALSE; 3kqO5+,C  
 } q9+`pj  
 …… //其它处理及默认处理 VS` tj  
} .Z?@;2<l  
8.JFQ/) i  
p6S{OUiG  
  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。 [l# 8}dy  
v\lhbpk  
  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。 b-!+Q)  
oW ! Z= ;  
  二、编程步骤 J)o.@+Q}  
j}s<Pn%4  
  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"; qe^d6  
M9~eDw'Pr  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; JJC Y M  
Z2P DT  
  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; Z01BzIsR  
~t=73 fwB  
  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; 1F|e/h%^  
^lvYj E  
  5、 添加代码,编译运行程序。 Q+<{2oVz  
G.{)#cR  
三、程序代码 -ElK=q  
~?6M4!u   
///////////////////////////////////// Hook.h : main header file for the HOOK DLL meF.`fh  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) LI~ofCp  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ CU`yi.)T{  
#if _MSC_VER > 1000 X mb001  
#pragma once vQH 6CB"  
#endif // _MSC_VER > 1000 LC>bZ!(i#  
#ifndef __AFXWIN_H__ simD<&p  
#error include 'stdafx.h' before including this file for PCH dgEH]9j&  
#endif rd_!'pG  
#include "resource.h" // main symbols =# /BCL7  
class CHookApp : public CWinApp ^QG;:.3v  
{ /`kM0=MMa  
 public: B+VD53 V  
  CHookApp(); ?z pN09e  
  // Overrides X;/5Niv32q  
  // ClassWizard generated virtual function overrides uD=FTx  
  //{{AFX_VIRTUAL(CHookApp) 1Zo"Xb  
 public: N\{{:<Cp\  
  virtual BOOL InitInstance(); 2%Mgg,/~  
  virtual int ExitInstance(); L#|6L np^  
  //}}AFX_VIRTUAL /_(q7:<ZF  
  //{{AFX_MSG(CHookApp) Mn<#rBE B  
  // NOTE - the ClassWizard will add and remove member functions here. >OxSrc@A  
  // DO NOT EDIT what you see in these blocks of generated code ! b[/uSwvi  
  //}}AFX_MSG EP'I  
  DECLARE_MESSAGE_MAP() w<|Qezi3 w  
}; 5 (cgHr"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); huat,zLS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lKSd]:3Xm  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dCn'IM1  
BOOL InitHotkey(); 4:0y\M5u  
BOOL UnInit(); U(6=;+q  
#endif qP5'&!s&!  
al1Nmc #  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. o;"Phc.  
#include "stdafx.h" V4 8o+O  
#include "hook.h" V;IV2HT0J"  
#include <windowsx.h> /%{Qf  
#ifdef _DEBUG (:r80:  
#define new DEBUG_NEW /H'F4->  
#undef THIS_FILE cii! WCu  
static char THIS_FILE[] = __FILE__; U9t-(`[j?  
#endif e-EY]%JO  
#define MAX_KEY 100 mmvo >F"  
#define CTRLBIT 0x04 9#MY(Hr  
#define ALTBIT 0x02 Hs`j6yuc9  
#define SHIFTBIT 0x01 o>jM4sk$  
#pragma data_seg("shareddata") 231,v,X[  
HHOOK hHook =NULL; SCL8.%z D  
UINT nHookCount =0; #`o]{UfW  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey _q z^|J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT n\w2e_g;N  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey x^V9;V@6  
static int KeyCount =0; PBOZ^%k  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7GDrH/yK  
#pragma data_seg() 4S1\5C9  
HINSTANCE hins; .H#<yPty  
void VerifyWindow(); kNk$[Yfs  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) tDQuimYu7  
//{{AFX_MSG_MAP(CHookApp) k];NTALOG  
// NOTE - the ClassWizard will add and remove mapping macros here. sL!+&Id|  
// DO NOT EDIT what you see in these blocks of generated code! @<ILF69b  
//}}AFX_MSG_MAP 2Fc>6]:*  
END_MESSAGE_MAP() Yaix\*II  
EPiZe-  
CHookApp::CHookApp() 2>*b.$g  
{ @;t6Slc"~  
 // TODO: add construction code here, Nv5)A=6#AA  
 // Place all significant initialization in InitInstance vhd+A  
} %CIRN}  
3L^]J}|  
CHookApp theApp; O6"S=o&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  /C   
{ *?3c2Jg=E  
 BOOL bProcessed=FALSE; ?rxq//S2  
 if(HC_ACTION==nCode) .K`EflN  
 { ),(HCzK`  
  if((lParam&0xc0000000)==0xc0000000){// Key up {$QkerW3  
   switch(wParam) 6olJ7`*  
   { &>A<{J@VL  
    case VK_MENU: 2(i| n=  
     MaskBits&=~ALTBIT; Ox%p"xuP,  
     break; $5\+Q W  
    case VK_CONTROL: :^rt8>~  
     MaskBits&=~CTRLBIT; N;S1s0FN  
     break; m[DCA\M o@  
    case VK_SHIFT: !:wA\mAd  
     MaskBits&=~SHIFTBIT; *2>kic aH  
     break; ib-H jJ8  
    default: //judge the key and send message Q N]y.(S)y  
     break; 7q(A&  
   } W<u,S  
   for(int index=0;index<MAX_KEY;index++){ IXv9mr?H}  
    if(hCallWnd[index]==NULL) )F_nK f"a  
     continue; RXRoMg!-P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G| b I$   
    { 'E"W;#%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7yQw$zG,Iz  
     bProcessed=TRUE; 2EiE5@  
    } 4n} a%ocv^  
   } xmi@ XL@t  
  } 6d(D >a  
  else if((lParam&0xc000ffff)==1){ //Key down hsHbT^Qm  
   switch(wParam) U:0Ma 6<  
   { Y?ZzFd,i&  
    case VK_MENU: \}71p zw(  
     MaskBits|=ALTBIT; L+8{%\UPd  
     break; m "96%sB  
    case VK_CONTROL: $wC'qV *  
     MaskBits|=CTRLBIT; UM<!bNz`  
     break; X ?U'GLm  
    case VK_SHIFT: =&F~GC Z>  
     MaskBits|=SHIFTBIT; [@_W-rA  
     break; )4TP{tp  
    default: //judge the key and send message  &2bqL!k  
     break; Eh*(N(`  
   } ?I$-im  
   for(int index=0;index<MAX_KEY;index++)  ejc>  
   { t:"3M iM=c  
    if(hCallWnd[index]==NULL) <$u\PJF7_^  
     continue; DTlId~Dyq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /gn!="J  
    { x\oSD1t,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [RF6mWQ  
     bProcessed=TRUE; wjfq"7Q  
    } }T-'""*  
   } ^J;rW3#N8  
  } qw 03]a  
  if(!bProcessed){ U;j\FE^+>  
   for(int index=0;index<MAX_KEY;index++){ !;;7:!)P  
    if(hCallWnd[index]==NULL) *M/ :W =,t  
     continue; aS``fE ;O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) KP&xk1 3)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m%=*3gH]&  
   } gD2P)7:  
  } s (K SN/  
 } BOWBD@y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); pD('6C;  
} Nz}PcWF/  
FA+"t^q  
BOOL InitHotkey() 5+Ao.3Xn  
{ }[R-)M  
 if(hHook!=NULL){ `?O0)  
  nHookCount++; >7PNl\=gG  
  return TRUE; {PR "}x  
 } .)SR3?   
 else [N12X7O3  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); : _tt9J  
  if(hHook!=NULL) ITg<u?z_  
   nHookCount++; ~Hu!iZ2]  
  return (hHook!=NULL); Z #T  
} 3)OQgeKU  
BOOL UnInit() uuxVVgWp{  
{ }8PO m#  
 if(nHookCount>1){ ^,,}2dsb>  
  nHookCount--; kIX1u<M~  
  return TRUE; 4v`IAR?&K;  
 } l&}}Io$?@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); x H&hs$=  
 if(unhooked==TRUE){  dOa9D  
  nHookCount=0; OQ- Hn -H  
  hHook=NULL; AL.psw-Il  
 } '_^T]fr}  
 return unhooked; +<j7^AEG  
} 0|J_'-<  
9Msy=qvYG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) '&'m# H*:  
{ *ziR&Fr!  
 BOOL bAdded=FALSE; L,[Q{:CS  
 for(int index=0;index<MAX_KEY;index++){ tc<uS%XT4^  
  if(hCallWnd[index]==0){ y)U ?.@  
   hCallWnd[index]=hWnd; g;v;xlY`N  
   HotKey[index]=cKey; Pc_aEBq  
   HotKeyMask[index]=cMask; 8;V9%h`P>  
   bAdded=TRUE; OQ7 `n<I<)  
   KeyCount++; Ml7 (<J  
   break; <S041KF.{6  
  } P RWb6  
 } LP=j/qf|  
 return bAdded; jx]P:]  
} Y}1c>5{bE  
TI8r/P? ]V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !t^DN\\#  
{ PO`p.("h  
 BOOL bRemoved=FALSE; Aeb(b+=  
 for(int index=0;index<MAX_KEY;index++){ QYboX~g~p  
  if(hCallWnd[index]==hWnd){ > .  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =9X1+x  
    hCallWnd[index]=NULL; \gk.[={^P  
    HotKey[index]=0; tqZ+2c<W3  
    HotKeyMask[index]=0; EU%,tp   
    bRemoved=TRUE;  @Fb1D"!  
    KeyCount--; L%T(H<G  
    break; 4P&2Z0  
   } >%k6k1CZ  
  } /{\ /e"5  
 } b,E?{uG  
 return bRemoved; 0RT8N=B83  
} <Gi%+I@szl  
A^>@6d $2  
void VerifyWindow() \</!kY*3@t  
{ G aV&y  
 for(int i=0;i<MAX_KEY;i++){ )1uiY f&k  
  if(hCallWnd!=NULL){ (4T0U5jgT  
   if(!IsWindow(hCallWnd)){ .9r YBy  
    hCallWnd=NULL; x#J9GP.  
    HotKey=0; ^_;'9YD  
    HotKeyMask=0; j#1G?MF  
    KeyCount--; l1)~WqhE}  
   } STp9Gh-  
  } D%p*G5Bg3  
 } QQM:[1;RT  
} iT>u&0B-  
V4:/LNq_]  
BOOL CHookApp::InitInstance()  Y~WdN<g  
{ BDB*>y7(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^#Ha H  
 hins=AfxGetInstanceHandle(); <+_XGOt0<  
 InitHotkey(); /MGapmqV9  
 return CWinApp::InitInstance(); \c< oVF'  
} 566!T_  
2R[v*i^S  
int CHookApp::ExitInstance() %MeAa?G-#  
{ #ibwD:{  
 VerifyWindow(); 2:*15RH3  
 UnInit(); <]qNjsdb9"  
 return CWinApp::ExitInstance(); Mg;pNK\n  
} .a.H aBBV  
CS7b3p!I  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file W,xdj!^t  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) L4>14D\  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ cx\E40WD  
#if _MSC_VER > 1000 A2|Bbqd  
#pragma once 79T_9}M  
#endif // _MSC_VER > 1000 ~}.C*;J  
qyz%9 9  
class CCaptureDlg : public CDialog ;6G]~}>o  
{ e~]P _53  
 // Construction kE&R;T`Gb%  
 public: >C0B!MT?3%  
  BOOL bTray; 7=P)`@  
  BOOL bRegistered; 6] x6FeuS  
  BOOL RegisterHotkey(); d@ZDIy  
  UCHAR cKey; gP% <<yl  
  UCHAR cMask; :zHSy&i`  
  void DeleteIcon(); X-\$<DiJGv  
  void AddIcon(); 8<VDp Y  
  UINT nCount; e>MtDJ5  
  void SaveBmp(); ynsYU(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor :'[?/<iTg  
  // Dialog Data REh"/d  
  //{{AFX_DATA(CCaptureDlg) opfnIkCe  
  enum { IDD = IDD_CAPTURE_DIALOG }; 1)z'-dQ-5$  
  CComboBox m_Key; q[U pP`Z%  
  BOOL m_bControl; Y=XDN:  
  BOOL m_bAlt; $DDO9  
  BOOL m_bShift; Zux L2W  
  CString m_Path; mI&3y9; (  
  CString m_Number; NS[Z@@  
  //}}AFX_DATA f7&ni#^Ztj  
  // ClassWizard generated virtual function overrides ?p{ -Yp*h  
  //{{AFX_VIRTUAL(CCaptureDlg) i+`8$uz  
 public: v[$e{Dz(  
  virtual BOOL PreTranslateMessage(MSG* pMsg); g2f"tu_/%  
 protected: =v3o)lU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  L` [iI  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); G? SPz  
  //}}AFX_VIRTUAL 4-bM90&1t  
  // Implementation .U{}N%S  
 protected: >l0Qd1   
  HICON m_hIcon; /[/L%;a'p  
  // Generated message map functions iZ]^JPU}  
  //{{AFX_MSG(CCaptureDlg) JrBPx/?(,;  
  virtual BOOL OnInitDialog(); Aw7N'0K9UN  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Bl>m`/\1i  
  afx_msg void OnPaint(); PS~_a  
  afx_msg HCURSOR OnQueryDragIcon(); "/R?XCBZsb  
  virtual void OnCancel(); gYt=_+-  
  afx_msg void OnAbout(); FO>?>tK 0  
  afx_msg void OnBrowse(); U%F a.bL~  
  afx_msg void OnChange(); X}GX6qAdt  
 //}}AFX_MSG >_Tyzl>z  
 DECLARE_MESSAGE_MAP() 24od74\  
}; ",~ZO<P  
#endif OTYkJEC8\N  
p4uzw  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file VK/L}^=GOO  
#include "stdafx.h" d\-*Fmp(S  
#include "Capture.h" WReHep  
#include "CaptureDlg.h" n%WjU)<  
#include <windowsx.h> N(i.E5&9  
#pragma comment(lib,"hook.lib") 7oC8I D  
#ifdef _DEBUG z$ QoMq]  
#define new DEBUG_NEW HMD\)vMK6  
#undef THIS_FILE 26}3  
static char THIS_FILE[] = __FILE__; [m! P(o  
#endif BuvnY  
#define IDM_SHELL WM_USER+1 6# bTlmcg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,]t_9B QK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ho#nM_ q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; `j3 OFC{7E  
class CAboutDlg : public CDialog d v4~CW%Td  
{ fNda&  
 public: \hBzQ%0  
  CAboutDlg(); 3 K||(  
  // Dialog Data InL_JobE8r  
  //{{AFX_DATA(CAboutDlg) E#d~.#uH  
  enum { IDD = IDD_ABOUTBOX }; C`ZU.|R  
  //}}AFX_DATA ]?V:+>t=  
  // ClassWizard generated virtual function overrides ;eo}/-a_Xw  
  //{{AFX_VIRTUAL(CAboutDlg) h143HXBi1+  
 protected: Fsl="RB7f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %$Fe[#1  
  //}}AFX_VIRTUAL 'JgCl'k,  
  // Implementation %INkuNa8\  
 protected: ;wJe%Nw?  
  //{{AFX_MSG(CAboutDlg) By9CliOy:  
  //}}AFX_MSG X!{K`~DRX  
  DECLARE_MESSAGE_MAP() d %FLk=]  
}; 'pUJREb  
J(8?6&=ck  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5MYdLAjV  
{ 6pb~+=3n  
 //{{AFX_DATA_INIT(CAboutDlg) T++q.oFc  
 //}}AFX_DATA_INIT 48S NI  
} /V cbT >=  
2&pE  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0)zJG |  
{ .*n*eeD,  
 CDialog::DoDataExchange(pDX); p,f$9t4  
 //{{AFX_DATA_MAP(CAboutDlg) -Ju;i<  
 //}}AFX_DATA_MAP "*`!.9pt  
} E`xpZ>$mPx  
]1zud  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Cb|1Jtb  
 //{{AFX_MSG_MAP(CAboutDlg) ~K5A$ s2  
 // No message handlers K } T=j+  
 //}}AFX_MSG_MAP 3.P7GbN  
END_MESSAGE_MAP() Wt@hST  
raSga'uT;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) G=Lg5`3;,  
: CDialog(CCaptureDlg::IDD, pParent) Yv)c\hm(7j  
{ Gj%q:[r  
 //{{AFX_DATA_INIT(CCaptureDlg) ,B_tAg4~  
  m_bControl = FALSE; =_ j<x$,b-  
  m_bAlt = FALSE; *ZLisq-f  
  m_bShift = FALSE; (GGosXU-v  
  m_Path = _T("c:\\"); HCkfw+gaV  
  m_Number = _T("0 picture captured."); !;vv-v,LQ  
  nCount=0; N5`z S79W  
  bRegistered=FALSE; 2"shB(:z>  
  bTray=FALSE; 8D@Jd  
 //}}AFX_DATA_INIT A)j!Wgs^z  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 RL\?i~'KH  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); n'q:L(`M  
} 9c*B%A8J  
dHg[r|xC  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Dm}M8`|X  
{ <s\ZqL$ f  
 CDialog::DoDataExchange(pDX); Og@{6>  
 //{{AFX_DATA_MAP(CCaptureDlg) ]xoG{%vgb  
  DDX_Control(pDX, IDC_KEY, m_Key); ]jiVe_ OS<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); yH43Yo#Rk  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Jd v;+HN[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); I S'Uuuz7g  
  DDX_Text(pDX, IDC_PATH, m_Path); [dz3k@ >0  
  DDX_Text(pDX, IDC_NUMBER, m_Number); QS\wtTXj  
 //}}AFX_DATA_MAP ;PMh>ZE`  
} ":s_ O.  
Fsx<Sa  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) );q~TZ[Do  
//{{AFX_MSG_MAP(CCaptureDlg) Y6)o7t  
 ON_WM_SYSCOMMAND() :/Es%z D  
 ON_WM_PAINT() n{etDO  
 ON_WM_QUERYDRAGICON() E]m?R 4  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) u,d5/`E  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u-:3C<&>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ,=[% #gS  
//}}AFX_MSG_MAP :-Py0{s  
END_MESSAGE_MAP() Su? cC/  
yf8kBT:&S  
BOOL CCaptureDlg::OnInitDialog() g*LD}`X/-  
{ rcMf1\  
 CDialog::OnInitDialog(); pz)>y&_o  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); SZ$WC8AX  
 ASSERT(IDM_ABOUTBOX < 0xF000); K r|.I2?"  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ) < U9  
 if (pSysMenu != NULL) -<5{wQE;|  
 { "&4r!2A  
  CString strAboutMenu; d(ypFd9z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); NIbK3`1  
  if (!strAboutMenu.IsEmpty()) {]dtA&8(  
  { 8=joVbs  
   pSysMenu->AppendMenu(MF_SEPARATOR); gOW8 !\V  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); fxr#T'i  
  } y5+%8#3  
 } yrfV&C%=n  
 SetIcon(m_hIcon, TRUE); // Set big icon fbbbTZy  
 SetIcon(m_hIcon, FALSE); // Set small icon 9`Fw}yAt  
 m_Key.SetCurSel(0); PcU~1m1  
 RegisterHotkey(); x(eX.>o\  
 CMenu* pMenu=GetSystemMenu(FALSE); /"u37f?[^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); nM b@  B  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2xX:Q'\2  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ArNQ}F/  
 return TRUE; // return TRUE unless you set the focus to a control p e+h8  
} T>L?\-  
.1{{E8Fj  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) YE{t?Y\5  
{ MsP6C)dz  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) hdrsa}{g  
 { (4A'$O2  
  CAboutDlg dlgAbout; X|eZpIA45  
  dlgAbout.DoModal(); xLOQu.  
 } V8TdtGB.|h  
 else bSX/)')jU  
 { xHJkzI  
  CDialog::OnSysCommand(nID, lParam); F!0iM)1o  
 } VK1B}5/  
} 0Q_*Z (  
R( FQ+h  
void CCaptureDlg::OnPaint()  L1 /`/  
{ ^9q#,6  
 if (IsIconic()) Y`bTf@EP>  
 { ~S\L(B(  
  CPaintDC dc(this); // device context for painting "W(Ae="60  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @&O4a2+  
  // Center icon in client rectangle 3+>n!8x ;A  
  int cxIcon = GetSystemMetrics(SM_CXICON); AO|9H`6U6F  
  int cyIcon = GetSystemMetrics(SM_CYICON); k<^M >` $  
  CRect rect; |9c~kTjK  
  GetClientRect(&rect); Ls9NQy  
  int x = (rect.Width() - cxIcon + 1) / 2; !!^z6jpvn  
  int y = (rect.Height() - cyIcon + 1) / 2; o" ,8   
  // Draw the icon `9J9[!+!`  
  dc.DrawIcon(x, y, m_hIcon); 7 D#y  
 } eNAxVF0  
 else V<0iYi;4=  
 { +)jll#}?  
  CDialog::OnPaint(); ,=m.WmXE  
 } ob{'Z]-V  
} J @"#  
#lP8/-s^  
HCURSOR CCaptureDlg::OnQueryDragIcon() ^}d]O(  
{ .="X vVdkp  
 return (HCURSOR) m_hIcon; 8I#ir4z#<  
} }bjZeh.  
:/;/mHG]  
void CCaptureDlg::OnCancel() "S%t\  
{ N"ga -u  
 if(bTray) '3(^Zv  
  DeleteIcon(); pD732L@q  
  CDialog::OnCancel(); G:1'}RC :  
} ;[sW\Ou  
ijF_ KP'  
void CCaptureDlg::OnAbout() a[O6xA%  
{ $>XeC}"x68  
 CAboutDlg dlg; } p'ZMj&  
 dlg.DoModal(); )?*YrWO{  
} )#}>,,S  
Dsg>~J'  
void CCaptureDlg::OnBrowse() _8VP'S=  
{ yp.K-  
 CString str; HgF;[rq3Q  
 BROWSEINFO bi; Ic#xz;elM  
 char name[MAX_PATH]; 5yy:JTAH5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); h4? x_"V"  
 bi.hwndOwner=GetSafeHwnd(); LwH#|8F  
 bi.pszDisplayName=name; 7^q~a(j  
 bi.lpszTitle="Select folder"; $1an#~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; hArY$T&MB  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~7P)$[  
 if(idl==NULL) BX@Iq  
  return; Wy}I"q[~So  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); I &t~o  
 str.ReleaseBuffer(); ut{T:kT  
 m_Path=str; *U?O4E9  
 if(str.GetAt(str.GetLength()-1)!='\\') Ux [<g%F"  
  m_Path+="\\"; e3?=1ZB  
 UpdateData(FALSE); >Jz9wo`  
} &XP(D5lf`B  
,5}U H  
void CCaptureDlg::SaveBmp()  P#,u9EIJ  
{ "F<CGSo  
 CDC dc; >ZgzE  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); RK>Pe3<  
 CBitmap bm; >qjV{M  
 int Width=GetSystemMetrics(SM_CXSCREEN); =l ,P'E  
 int Height=GetSystemMetrics(SM_CYSCREEN); j2Zp#E!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); *eVq(R9?T  
 CDC tdc; /:&!o2&1H  
 tdc.CreateCompatibleDC(&dc); kI\m0];KnQ  
 CBitmap*pOld=tdc.SelectObject(&bm); hRcb}>pr  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); XpQOl  
 tdc.SelectObject(pOld); H"C'<(4*\  
 BITMAP btm; gV_/t+jI  
 bm.GetBitmap(&btm); 4`IM[DIG~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; dhl[=Y ` Q  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); o\AnM5  
 BITMAPINFOHEADER bih; f^WTsh]  
 bih.biBitCount=btm.bmBitsPixel; 3dShznlf_*  
 bih.biClrImportant=0; IUcL*  
 bih.biClrUsed=0; pJpapA2l*6  
 bih.biCompression=0; [|u^:&az  
 bih.biHeight=btm.bmHeight; ( ?V`|[+u  
 bih.biPlanes=1; e%4?-{(  
 bih.biSize=sizeof(BITMAPINFOHEADER); \INH[X#>  
 bih.biSizeImage=size; bf3!|Um  
 bih.biWidth=btm.bmWidth; !*IMWm>  
 bih.biXPelsPerMeter=0; YdY-Jg Xm  
 bih.biYPelsPerMeter=0; E_HB[ 9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {Z.6\G&q  
 static int filecount=0; &c`-/8c  
 CString name; <P9fNBGa  
 name.Format("pict%04d.bmp",filecount++); ) "#'   
 name=m_Path+name; TQ Vk;&A  
 BITMAPFILEHEADER bfh; WA{igj@\  
 bfh.bfReserved1=bfh.bfReserved2=0; &v\F ah U  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ZO}Og&%  
 bfh.bfSize=54+size; 0ju1>.p  
 bfh.bfOffBits=54; t<%0eu|  
 CFile bf; wN 2+3LY{  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;`9f<d#\  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); \ /-c)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }fpya2Xt  
  bf.WriteHuge(lpData,size); ]n ?x tI  
  bf.Close(); A=CeeC]}  
  nCount++; 3JoY-  
 } :fRXLe1=  
 GlobalFreePtr(lpData); Vs>Pv$kW  
 if(nCount==1) I Mgd2qIC  
  m_Number.Format("%d picture captured.",nCount); Er~17$b  
 else B( [x8A]  
  m_Number.Format("%d pictures captured.",nCount); Iw1Y?Qia  
  UpdateData(FALSE); =O/Bte.  
} a(Y'C`x  
BT{;^Hp  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ^-;S&=  
{ WxdQ^#AE  
 if(pMsg -> message == WM_KEYDOWN) U%{GLO   
 { #kg`rrF r  
  if(pMsg -> wParam == VK_ESCAPE) ,RP-)j"Wff  
   return TRUE; aCQtE,.  
  if(pMsg -> wParam == VK_RETURN) (su,= Z  
   return TRUE; MsB >3  
 } ~KK 9aV{  
 return CDialog::PreTranslateMessage(pMsg); UuG%5 ZC  
} 6|97;@94  
^ 5 >e  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $QX$rN  
{ 3WV(Ok  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ uL'f8Pqg  
  SaveBmp(); 0SpB 2>_  
  return FALSE; OhF55,[  
} 3 qYGEhxv  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ #86N !&x  
 CMenu pop; D?|D)"?qb  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); mrGV{{.  
 CMenu*pMenu=pop.GetSubMenu(0); [X(m[u'%  
 pMenu->SetDefaultItem(ID_EXITICON); o7y<Zd`Bj  
 CPoint pt; l![M,8  
 GetCursorPos(&pt);  <,.$U\W  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); l\U Q2i  
 if(id==ID_EXITICON) g/?Vl2W  
  DeleteIcon(); WR+j?Fcf  
 else if(id==ID_EXIT) Jcw^Z,  
  OnCancel(); s"L&y <?)  
 return FALSE; RK# 6JfC3X  
} Sn:>|y~  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $C16}^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) J_s`G  
 AddIcon(); Fwm$0=BXL  
 return res; D#jwI,n}x  
} 6:1`lsP  
OjU{r N*  
void CCaptureDlg::AddIcon() vrn4yHoZ  
{ x0 7 =  
 NOTIFYICONDATA data; cS&KD@.  
 data.cbSize=sizeof(NOTIFYICONDATA); VO#rJ1J  
 CString tip; o.s'0xP]  
 tip.LoadString(IDS_ICONTIP); ;_sJ>.=\  
 data.hIcon=GetIcon(0); %$BRQ-O  
 data.hWnd=GetSafeHwnd(); yoE-a  
 strcpy(data.szTip,tip); {uDW<u_!  
 data.uCallbackMessage=IDM_SHELL; =D zrM%  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; a%go[_w  
 data.uID=98; 2"0VXtv6  
 Shell_NotifyIcon(NIM_ADD,&data); 4+olyBht  
 ShowWindow(SW_HIDE); q 4BXrEOw  
 bTray=TRUE; ra^</o/  
} xvGYd,dlK  
MmJMx  
void CCaptureDlg::DeleteIcon() YznL+TD  
{ D5zc{) /  
 NOTIFYICONDATA data; (lsG4&\0F  
 data.cbSize=sizeof(NOTIFYICONDATA); k|fM9E  
 data.hWnd=GetSafeHwnd(); q/U-WQ<+  
 data.uID=98; l|g*E.:4  
 Shell_NotifyIcon(NIM_DELETE,&data); <Qq {&,Le  
 ShowWindow(SW_SHOW); %Tp9G Gt  
 SetForegroundWindow(); LP3#f{U  
 ShowWindow(SW_SHOWNORMAL); eDd& vf  
 bTray=FALSE; O"9t,B>=i  
} k?cX f j&  
,~L*N*ML  
void CCaptureDlg::OnChange() |:)Bo<8  
{ J~x]~}V&  
 RegisterHotkey(); t/i*.>7  
} M]8>5Zx.  
XRaGV~  
BOOL CCaptureDlg::RegisterHotkey() $$AZ)#t[  
{ R;"$PH D  
 UpdateData(); p5In9s  
 UCHAR mask=0; a- *sm~u  
 UCHAR key=0; `!8\ |/  
 if(m_bControl) ,|f=2t+5X  
  mask|=4; oy[s])Tg  
 if(m_bAlt) B"v*[p?  
  mask|=2; F%L"Q>aHW  
 if(m_bShift) $#^3>u  
  mask|=1; qJ" (:~  
  key=Key_Table[m_Key.GetCurSel()]; CXUF=IE  
 if(bRegistered){ 8hV]t'/;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); erI&XI  
  bRegistered=FALSE; <B%wq>4S  
 } [,bJKz)a  
 cMask=mask; ]xf89[;0  
 cKey=key; Y1o[|yt W  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mI2Gs) SO  
 return bRegistered; dC<%D'L*  
} !19T=p/:$  
58?WO}  
  四、小结 "]^U(m>f  
+@$VJM%^7b  
  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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