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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: MhI)7jj`mt  
  RYZE*lWUh  
  一、实现方法 [x<6v}fRn  
Kxl,] |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: rt^45~  
"8muMa8Q%  
#pragma data_seg("shareddata") 3[=`uO0\7  
HHOOK hHook =NULL; //钩子句柄 fEw=I7{Y  
UINT nHookCount =0; //挂接的程序数目 7ITl3>  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 8q?;Hg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 uB <F.!3  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey i ,IM?+4  
static int KeyCount =0; @\T;PTD-  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -[pCP_`)u  
#pragma data_seg() y2#>c*  
Y <Znv%M  
  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。 }, fo+vRM  
5{FM#@  
  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: %7]XW2u  
k?HrD"k"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR !rXcGj(k  
cKey,UCHAR cMask) '>e79f-O)  
{ "@{4.v^}!  
 BOOL bAdded=FALSE; 1O9p YW5J  
 for(int index=0;index<MAX_KEY;index++){ Sn(l$wk=  
  if(hCallWnd[index]==0){ dm2CA0   
   hCallWnd[index]=hWnd; Be{/2jU%  
   HotKey[index]=cKey; ?]W~ qgA  
   HotKeyMask[index]=cMask; 7rdw`  
   bAdded=TRUE; "X5_-l  
   KeyCount++; w<Yv`$-`  
   break; }. xrJ52Tz  
  } 2gwZb/'i  
 } skI(]BDf  
 return bAdded; `c'   
} oQ%\[s$  
//删除热键 x7.QL?qR.  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {Z#e{~m#  
{ +5HnZ?E\  
 BOOL bRemoved=FALSE; Y$`eg|$  
 for(int index=0;index<MAX_KEY;index++){ 0iJ!K;A2%  
  if(hCallWnd[index]==hWnd){ ^qeY9O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #v4LoNm  
    hCallWnd[index]=NULL; R <;OEN  
    HotKey[index]=0; 4mN].X[,  
    HotKeyMask[index]=0; ;8ET!&k*>E  
    bRemoved=TRUE; C,A!tj7@  
    KeyCount--; :K~rvv\L7  
    break; yB,{#nM>8  
   } jg [H}  
  } pb^,Qvnp   
 } bVoU|`c  
 return bRemoved; C$<"w,  
} ?;|@T ty%  
NunV8atn:  
#?{qlgv<p  
  DLL中的钩子函数如下: (j' {~FB  
bMN@H\Ek  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )Hbb&F  
{ e>l,(ql  
 BOOL bProcessed=FALSE; I^~=,D  
 if(HC_ACTION==nCode) U4>O\sU  
 { v6s\Z\v)Q`  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 'K@-Z]  
   switch(wParam) D ]OD.  
   {  |3}5:k  
    case VK_MENU: 4YszVT-MU~  
     MaskBits&=~ALTBIT; QyPg |#T2>  
     break; (1CJw:  
    case VK_CONTROL: egm)a   
     MaskBits&=~CTRLBIT; N&T:Lt_N  
     break; zfhTc=(/  
    case VK_SHIFT: s%~L4Wmcq  
     MaskBits&=~SHIFTBIT; z[fB!O  
     break; s/ M7Zl  
    default: //judge the key and send message wGvhB%8K  
     break; t|}O.u-&;~  
   } h#i\iK&A  
   for(int index=0;index<MAX_KEY;index++){ \PpXL*.  
    if(hCallWnd[index]==NULL) [,=d7*b(l  
     continue; 8j%'9vPi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }g`Gh|C  
    { -G9|n#zCU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ) Qq'Wp3i  
     bProcessed=TRUE; @mf({Q>  
    } s5l3V2k  
   } [*8Y'KX <  
  } +$47v$p  
  else if((lParam&0xc000ffff)==1){ //有键按下 |; $Bb866/  
   switch(wParam) z{:-!oF&CB  
   { -Ep!- a  
    case VK_MENU: OL'P]=U  
     MaskBits|=ALTBIT; {Oj7  
     break; H}Ucrv:  
    case VK_CONTROL: kneuV8+(5  
     MaskBits|=CTRLBIT; a2`%gh W3  
     break; 4KXc~eF[M"  
    case VK_SHIFT: %,\=s.~1  
     MaskBits|=SHIFTBIT; X\Y}oa."A  
     break; .2.qR,"j  
    default: //judge the key and send message }`xdWY  
     break; 6<X%\[)n  
   } FJeiY#us  
   for(int index=0;index<MAX_KEY;index++){ ESTM$k }X  
    if(hCallWnd[index]==NULL) x)SralWb  
     continue; b9~A-Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) K R,z^9  
    { ` #OSl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \'Ssn(s  
     bProcessed=TRUE; 2N5`'  
    } bFY~oa%C  
   } Ipe n  
  } Ooc\1lX  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ve Tx, \6@  
   for(int index=0;index<MAX_KEY;index++){ R_ ZK0ar  
    if(hCallWnd[index]==NULL) fE]XWA4U  
     continue; LlHa5]E@6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;),"M{"v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (YPi&w~S  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ;f1qLI  
   } f>2MI4nMG  
  } h!gk s-0  
 } iafE5b)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jZteooJG|  
} }!p`1]gem  
o*5U:'=5}  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: t$J.+}}I  
MSw$_d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oDn|2Sdqd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Qkcjr]#^$  
;Hmp f0$  
  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: T/pqSmVpM  
7fHc[,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c!#:E`  
{ &@% $2O.3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) $pyOn2}  
 { i/H+xrCK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `=UWqb(K_  
  SaveBmp(); I_1e?\  
  return FALSE; i,I B!x  
 } b2,!g }I  
 …… //其它处理及默认处理 Djq!P  
} |~!U4D\  
*`_{  
Q GZyL)Q  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 2ZcKK8X;7  
3"N)xO-  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 7 aV%=_  
1)m@?CaI`  
  二、编程步骤 ag-f{UsTy  
3ZEB  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; MN ^Aw9U  
U*3J+Y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; d?wc*N3  
#J (~_%Wi  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; u .f= te  
0k)rc$eDF+  
  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; }}v9 `F  
v6.t{6zYgY  
  5、 添加代码,编译运行程序。 vM:cWat  
I9h ?;(  
三、程序代码 4}+/F}TbJ5  
g0R~&AN!g  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 7f rTTSZ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ls@i".[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wLK07e(  
#if _MSC_VER > 1000 ;AO#xv+#  
#pragma once 8YC_3Yi%  
#endif // _MSC_VER > 1000 _XCOSomL`  
#ifndef __AFXWIN_H__ q$I:`&  
#error include 'stdafx.h' before including this file for PCH _SW3_8SuM.  
#endif /1Ue?)g  
#include "resource.h" // main symbols Cj~'Lhmv'T  
class CHookApp : public CWinApp zR2B- &]H  
{ .o) `m9/  
 public: ;)N>t\v  
  CHookApp(); pe^u$YE  
  // Overrides lOtDqb&  
  // ClassWizard generated virtual function overrides 6DH~dL_",%  
  //{{AFX_VIRTUAL(CHookApp) d3=KTTi\  
 public: <HbcNE~  
  virtual BOOL InitInstance(); ep)>X@t  
  virtual int ExitInstance(); L 4!{h|  
  //}}AFX_VIRTUAL JvY}-}?c  
  //{{AFX_MSG(CHookApp) j~!X;PV3  
  // NOTE - the ClassWizard will add and remove member functions here. xlQBe-Wg  
  // DO NOT EDIT what you see in these blocks of generated code ! ,7<f9 EVY  
  //}}AFX_MSG ^]TVo\,N  
  DECLARE_MESSAGE_MAP() 7(pF[LCF  
}; V4_=<W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); PYGRsrcFd#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 30SW\@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j KoG7HH  
BOOL InitHotkey(); [eC2"&}  
BOOL UnInit(); )ubiB^g'm  
#endif Za 1QC;7  
k |eBJ%  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >r !|sC  
#include "stdafx.h" B]Thn  
#include "hook.h" 0N $v"uX@  
#include <windowsx.h> }hhGu\  
#ifdef _DEBUG g"}%2~Urf  
#define new DEBUG_NEW ~{jcH  
#undef THIS_FILE >U[j]V]  
static char THIS_FILE[] = __FILE__; Ru>MFG  
#endif |a Vn&qK  
#define MAX_KEY 100 ]x(!&y:h  
#define CTRLBIT 0x04 .=s&EEF  
#define ALTBIT 0x02 tP$<UKtU  
#define SHIFTBIT 0x01 eQ]~dA8>  
#pragma data_seg("shareddata") E>D_V@,/  
HHOOK hHook =NULL; =,6z4" )  
UINT nHookCount =0; PamO8^!G  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ;EP:o%r  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT H" 3fT0  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }khV'6"'|  
static int KeyCount =0; ` 2V19 s]  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift RO'7\xvn  
#pragma data_seg() q1d}{DU  
HINSTANCE hins; D=-SO +  
void VerifyWindow(); rE.;g^4p  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 6[ j.@[t  
//{{AFX_MSG_MAP(CHookApp) JehrDC2N  
// NOTE - the ClassWizard will add and remove mapping macros here. ).`1+b  
// DO NOT EDIT what you see in these blocks of generated code! 3cK I  
//}}AFX_MSG_MAP  +|n*b  
END_MESSAGE_MAP() "hH.#5j  
4R1<nZ"e~  
CHookApp::CHookApp() 0dE@c./R i  
{ RAgg:3^  
 // TODO: add construction code here, wsI`fO^A8  
 // Place all significant initialization in InitInstance "&G/T ?4  
} b*c*r dTx  
1W^t aJH]  
CHookApp theApp; o$jLzE"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dMv=gdY  
{ :V RNs  
 BOOL bProcessed=FALSE; !Prg_6 `  
 if(HC_ACTION==nCode) R{<kW9!  
 { $P^q!H4D  
  if((lParam&0xc0000000)==0xc0000000){// Key up Vc\MV0lr  
   switch(wParam) }ppN k:B  
   { a|t$l=|DD  
    case VK_MENU: v&DI`xn~  
     MaskBits&=~ALTBIT; Hq:X{)"  
     break; 6t[+pL\b  
    case VK_CONTROL: lb4Pcd j  
     MaskBits&=~CTRLBIT; S&Zm0Ku  
     break; /R]U}o^/(%  
    case VK_SHIFT: qkDI](4  
     MaskBits&=~SHIFTBIT; n' n/Tu   
     break; @\0ez<.p}  
    default: //judge the key and send message H1|?t+oP  
     break; ^}/PGG\~r  
   } Rr&h!YMb  
   for(int index=0;index<MAX_KEY;index++){ <J< {l  
    if(hCallWnd[index]==NULL) V_ :1EBzz  
     continue; 9-&Ttbb4)0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bh,[ 3X%  
    { g:g\>@Umo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); AVlhNIr  
     bProcessed=TRUE; X5zDpi|Dq  
    } x nsLf?>]  
   } )WNzWUfn=z  
  } CGW.I$u  
  else if((lParam&0xc000ffff)==1){ //Key down ]sf7{lVT  
   switch(wParam) deBY5|  
   { 6M @[B|Q(  
    case VK_MENU: V\ZGd+?  
     MaskBits|=ALTBIT; ,>bh$|  
     break; XRM_x:+]  
    case VK_CONTROL: c69C  
     MaskBits|=CTRLBIT; hgYZOwQ  
     break; Vz~{UHH6  
    case VK_SHIFT: M8kPj8}{  
     MaskBits|=SHIFTBIT; M'7f O3&|  
     break; jFQQ`O V  
    default: //judge the key and send message &47i"%  
     break; (5$!MUS~9  
   } cM(:xv  
   for(int index=0;index<MAX_KEY;index++) l: HTk4$0  
   { [\^ n=  
    if(hCallWnd[index]==NULL) T,,WoPU8t  
     continue; |s7s6k)mm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7Haa;2 T'  
    { Q3kdlxXR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 27eooY1  
     bProcessed=TRUE; 5kc/Y/4o  
    } z`.<U{5  
   } 1!xQ=DU"  
  } 'F+C4QAq  
  if(!bProcessed){ Nyku4r0  
   for(int index=0;index<MAX_KEY;index++){ 7-bd9uVK  
    if(hCallWnd[index]==NULL) $SlIr<'*"  
     continue; H4WP~(__  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7x"R3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); u 1>2v  
   } ]J1dtN=  
  } qzYwt]GNS  
 } "3X2VFwoJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^h(ew1:  
} R6` WN  
=:xW>@bh|  
BOOL InitHotkey() W,K;6TZhh  
{ !8TlD-ZT/  
 if(hHook!=NULL){ MUaq7B_>  
  nHookCount++; +Zb;Vn4  
  return TRUE; (of#(I[m7  
 } qrb[-|ie&  
 else T-'OwCB1q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); )MtF23k)g  
  if(hHook!=NULL) P@,XEQRd`  
   nHookCount++; 4-l 8,@9  
  return (hHook!=NULL); .N,bIQnj  
} p\Q5,eg  
BOOL UnInit() W/=.@JjI  
{ G4Q[Th  
 if(nHookCount>1){ :">!r.Q  
  nHookCount--; Uf1!qP/H?  
  return TRUE; T(#J_Y  
 } R}-(cc%5  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 4zXFuTr($  
 if(unhooked==TRUE){ d?y4GkK  
  nHookCount=0; /fKx} }g)  
  hHook=NULL; "H=6j)Cb  
 } 0CWvYC%e  
 return unhooked; 6gL #C&  
} C(eTR1  
5Y.)("1f}f  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4R#chQ  
{ ?fQ'^agq  
 BOOL bAdded=FALSE; @bi}W`  
 for(int index=0;index<MAX_KEY;index++){ RF`.xQ26=  
  if(hCallWnd[index]==0){ OTvPUkp*  
   hCallWnd[index]=hWnd; 1D7nkAy  
   HotKey[index]=cKey; WltQ63u  
   HotKeyMask[index]=cMask; xzdf^Ce  
   bAdded=TRUE; GF"hx`zyJ  
   KeyCount++; ]{sU&GqBLe  
   break; Ryl:a\  
  } "SNn^p59k  
 } |'e^QpU5  
 return bAdded; Q{O+  
} Giid~e33  
t=BUN  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) N+9VYH"*  
{ )~GmU9f  
 BOOL bRemoved=FALSE; #%pI(,o=  
 for(int index=0;index<MAX_KEY;index++){ h8x MI  
  if(hCallWnd[index]==hWnd){ 2A']y D  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +=>,Pto<  
    hCallWnd[index]=NULL; M=8.Bp|Ye  
    HotKey[index]=0; ZFi ee|,q  
    HotKeyMask[index]=0; ](Xb _xMf  
    bRemoved=TRUE; fnpYT:%fG  
    KeyCount--; w{{gu1#]G  
    break; *~2,/D  
   } 4%{,] q\p  
  } O 5!7'RZ  
 } |e=,oV"  
 return bRemoved; @g|v;B|{  
} #./fY;:cj  
{WJm  
void VerifyWindow() ?(xnSW@r  
{ <'}YyU=  
 for(int i=0;i<MAX_KEY;i++){ .7O*pJ2(H  
  if(hCallWnd!=NULL){ &C:IX\  
   if(!IsWindow(hCallWnd)){ _PPy44r2  
    hCallWnd=NULL; ?K1/ <PE+  
    HotKey=0; T!uM+6|Y  
    HotKeyMask=0; f@6QvkIa  
    KeyCount--; \h+AXs<j  
   } GmK^}=frj  
  } }?lrU.@zg  
 } u+dLaVlLJ  
} ] ;KJ6  
3Nl <p"=  
BOOL CHookApp::InitInstance() 5b5x!do  
{ +u.1 ;qF  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); {GvJZ!,RCg  
 hins=AfxGetInstanceHandle(); SfA\}@3  
 InitHotkey(); 7 G)ZN{'  
 return CWinApp::InitInstance(); 65L6:}#  
} _ "E$v&_  
{M3qLf~z#C  
int CHookApp::ExitInstance() K~uXO  
{ {vs uPY  
 VerifyWindow(); |U~<3.:m:  
 UnInit(); .GbX]?dN  
 return CWinApp::ExitInstance(); }~2LW" 1'  
} XWDL5K  
v0ujdp,B  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "7U4'Y:E  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) w?3p';C  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ PYiU_  
#if _MSC_VER > 1000 JELT ou  
#pragma once toLV4BtIG  
#endif // _MSC_VER > 1000 90Pl$#cb2  
5]~'_V  
class CCaptureDlg : public CDialog ,k.3|aZE  
{ _> f`!PlB|  
 // Construction Y)1PB+  
 public: ?U%QG5/>  
  BOOL bTray; S O4u9V  
  BOOL bRegistered; Q`~jw>x  
  BOOL RegisterHotkey(); '>NCMB{*  
  UCHAR cKey; ~Uu4=  
  UCHAR cMask; e%@'5k\SK  
  void DeleteIcon(); ~Uj=^leYO  
  void AddIcon(); ;m0~L=w  
  UINT nCount; :Hn6b$Vy8  
  void SaveBmp(); :uP,f<=)K  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor kh!FR u h  
  // Dialog Data vhe>)h*B  
  //{{AFX_DATA(CCaptureDlg) x%s-+&  
  enum { IDD = IDD_CAPTURE_DIALOG }; O $LfuL  
  CComboBox m_Key; rr+|Zt Y  
  BOOL m_bControl; V n7*JS  
  BOOL m_bAlt; NYt&@Z}]  
  BOOL m_bShift; .@2m07*1  
  CString m_Path; nR7d4)  
  CString m_Number; @u.58H& }R  
  //}}AFX_DATA bG7O  
  // ClassWizard generated virtual function overrides 2- &k^Gl!:  
  //{{AFX_VIRTUAL(CCaptureDlg) ?iPC*  
 public: >x/z7v?^I  
  virtual BOOL PreTranslateMessage(MSG* pMsg); gRrL[z  
 protected: &?W0mW(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xRJ\E }/7  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7zA'ri3w  
  //}}AFX_VIRTUAL Y}x>t* I  
  // Implementation qJ;jfh!  
 protected: uYn_? G  
  HICON m_hIcon; ;ZH3{  
  // Generated message map functions B,<da1(a  
  //{{AFX_MSG(CCaptureDlg) ]|!OP  
  virtual BOOL OnInitDialog(); 4h~iPn'Wl  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); j:<n+:H C  
  afx_msg void OnPaint(); p%#<D9S  
  afx_msg HCURSOR OnQueryDragIcon(); ?u-|>N>  
  virtual void OnCancel(); C+'/>=>a.  
  afx_msg void OnAbout(); OJ,`  
  afx_msg void OnBrowse(); 6tB+JF  
  afx_msg void OnChange(); YHkn2]^#A  
 //}}AFX_MSG n\QgOSr<  
 DECLARE_MESSAGE_MAP() |h-QP#]/  
}; OPwtV9%  
#endif .}^g!jm~h  
ao%NK<Lt  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &wi e]  
#include "stdafx.h" Uhe=h&e2k@  
#include "Capture.h" JX -' mV`  
#include "CaptureDlg.h" R?68*} `7  
#include <windowsx.h> j!_;1++q  
#pragma comment(lib,"hook.lib") -- PtZ]Z  
#ifdef _DEBUG A$<.a'&T!  
#define new DEBUG_NEW @AG n{q  
#undef THIS_FILE X59: C3c  
static char THIS_FILE[] = __FILE__; 0":ib0=  
#endif T29Dt  
#define IDM_SHELL WM_USER+1 JF # # [O  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mZk]l5Lc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,ek_R)&[o  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; D6%J\C13`  
class CAboutDlg : public CDialog c0PIc^R(@  
{ |*:'TKzNS  
 public: P=7zs;k  
  CAboutDlg(); ^.KwcXr  
  // Dialog Data <PapskO>  
  //{{AFX_DATA(CAboutDlg) 8s"%u )  
  enum { IDD = IDD_ABOUTBOX }; Q(lo{AFc  
  //}}AFX_DATA 3 N.~mR  
  // ClassWizard generated virtual function overrides >Nvjl~o5  
  //{{AFX_VIRTUAL(CAboutDlg) 6""G,"B  
 protected: wN`jE0 {  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]j'p :v  
  //}}AFX_VIRTUAL T@G?t0  
  // Implementation m=?KZ?U`  
 protected: (0j}-iaQEZ  
  //{{AFX_MSG(CAboutDlg) s@9vY\5[9  
  //}}AFX_MSG }3o|EXx=  
  DECLARE_MESSAGE_MAP() W"zab  
}; HIQ _%L4]  
8JM&(Q%#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 8C[C{qOJ  
{ nTuJEFn{  
 //{{AFX_DATA_INIT(CAboutDlg) IAYR+c  
 //}}AFX_DATA_INIT 2HpHxVJ  
} vk+VP 1D  
k,'L}SK  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 87Oad@FOr  
{ m6TNBX  
 CDialog::DoDataExchange(pDX); Du`JaJI  
 //{{AFX_DATA_MAP(CAboutDlg) Q o?O:  
 //}}AFX_DATA_MAP @{YS}&Q/  
} `4(e  
#,7e NM"  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g}f`,r9  
 //{{AFX_MSG_MAP(CAboutDlg) C 'v+f=  
 // No message handlers \Z]UA&v_  
 //}}AFX_MSG_MAP eAXc:222  
END_MESSAGE_MAP() v\!Be[ ?  
/`f^Y>4gD  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B-.gI4xa  
: CDialog(CCaptureDlg::IDD, pParent) )>.&N[v  
{ |zR8rqBX;  
 //{{AFX_DATA_INIT(CCaptureDlg) 3 DDML,  
  m_bControl = FALSE; >=RmGS  
  m_bAlt = FALSE; gg[WlRQK4A  
  m_bShift = FALSE; p<zSJLN  
  m_Path = _T("c:\\"); d{XO/YQw  
  m_Number = _T("0 picture captured."); |(pRaiJ  
  nCount=0; %<E$,w>  
  bRegistered=FALSE; e<=cdze  
  bTray=FALSE; Z3{>yYR+  
 //}}AFX_DATA_INIT 7B b9 t  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 zhpx"{_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *RXbc~ H  
} PE~G=1x3  
>H'4{|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {7$c8i  
{ WKT4D}{1  
 CDialog::DoDataExchange(pDX); `wus\&!W  
 //{{AFX_DATA_MAP(CCaptureDlg) 3D` YZ#M  
  DDX_Control(pDX, IDC_KEY, m_Key); l% ?T2Fm3>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); @\0Eu212  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 99}(~B  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ux_Mrh'  
  DDX_Text(pDX, IDC_PATH, m_Path); ?**+e%$$  
  DDX_Text(pDX, IDC_NUMBER, m_Number); eln&]d;  
 //}}AFX_DATA_MAP q8s0AN'@t'  
} O J/,pLYu  
Ko;{I?c  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0}$Hi  
//{{AFX_MSG_MAP(CCaptureDlg) b+@JY2dvj  
 ON_WM_SYSCOMMAND() 0|$v-`P$  
 ON_WM_PAINT() CPP` qt%f  
 ON_WM_QUERYDRAGICON() nyBJb(5"B  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) R(2tlZ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Cz 72?[6  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +)j$|x~(A  
//}}AFX_MSG_MAP c%&: 6QniZ  
END_MESSAGE_MAP() !'mq ?C=  
u#Z#)3P  
BOOL CCaptureDlg::OnInitDialog() 0Uz\H0T1  
{ UG2nX3?  
 CDialog::OnInitDialog(); ?\$#L^;b}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); rypTKT|U;  
 ASSERT(IDM_ABOUTBOX < 0xF000); {jYOs l  
 CMenu* pSysMenu = GetSystemMenu(FALSE); T2SP W@#Z3  
 if (pSysMenu != NULL) 4T!+D  
 { h<Ft_#|o[  
  CString strAboutMenu; Eve.QAl|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); mMb'@  
  if (!strAboutMenu.IsEmpty()) UG)8D5  
  { QS{1CC9$  
   pSysMenu->AppendMenu(MF_SEPARATOR); DTa N"{  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); D+]a.& {p  
  } cgm81+[%r  
 } gA:5M  
 SetIcon(m_hIcon, TRUE); // Set big icon ZHGC6a!a  
 SetIcon(m_hIcon, FALSE); // Set small icon )=AHf?hn  
 m_Key.SetCurSel(0); b!sRk@LGZ  
 RegisterHotkey(); :lB=L r)  
 CMenu* pMenu=GetSystemMenu(FALSE); 6 G3\=)  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); LM7$}#$R  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `FYv3w2  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); XVKfl3'%  
 return TRUE; // return TRUE unless you set the focus to a control uoHNn7W  
} %,D<O,N  
&jsVw)Ue  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7PANtCFb&  
{ 4g : >[q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5e$~)fL  
 { F8;dKyT?q  
  CAboutDlg dlgAbout; |4T !&[r  
  dlgAbout.DoModal(); E-I-0h2  
 } 0%m)@ukb  
 else $% 1vW=d  
 { <Wp QbQM  
  CDialog::OnSysCommand(nID, lParam); #a`a$A  
 } 0KGY\,ae:;  
} (N&lHLy  
,`gl&iB  
void CCaptureDlg::OnPaint() d/ bEt&  
{ mnmP<<8C,  
 if (IsIconic()) du)~kU>l  
 { .G+Pe'4a  
  CPaintDC dc(this); // device context for painting M@?xa/E64  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); p;W.lcO`0  
  // Center icon in client rectangle |1b_3?e  
  int cxIcon = GetSystemMetrics(SM_CXICON); &|!7Z4N  
  int cyIcon = GetSystemMetrics(SM_CYICON); T}"6wywM  
  CRect rect; b@S Cn9  
  GetClientRect(&rect); PB#fP_0C  
  int x = (rect.Width() - cxIcon + 1) / 2; mml<9fbH  
  int y = (rect.Height() - cyIcon + 1) / 2; 9A,^c;  
  // Draw the icon c zm& ~n6$  
  dc.DrawIcon(x, y, m_hIcon); 'B@e8S) y  
 } 7.Z@Wr?  
 else B<~ NS)w  
 { (;q\}u  
  CDialog::OnPaint(); *cC_j*1@  
 } rFC" Jx  
} "g' jPwFG  
J41G&$j(  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9nH?l{As   
{ GKoK7qH\J  
 return (HCURSOR) m_hIcon; Hd,p!_  
} !zPa_`P  
Db6om7N  
void CCaptureDlg::OnCancel() |\U5) ,m  
{ )l!3(  
 if(bTray) N_pJk2E  
  DeleteIcon(); 1qf!DMcdZ  
  CDialog::OnCancel(); (iR ide  
} I =1+h  
/w]!wM  
void CCaptureDlg::OnAbout() (y M^  
{ BM(]QUxRd  
 CAboutDlg dlg; sgO'wXcoP  
 dlg.DoModal(); 5!EJxP9  
} v@wb"jdFi$  
Rr!Y3)f;  
void CCaptureDlg::OnBrowse() 7^Ns&Q  
{ v{9t]s>B  
 CString str; X`fn8~5  
 BROWSEINFO bi; C&6IU8l\  
 char name[MAX_PATH]; XK: 9r{r{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); M?[h0{^K  
 bi.hwndOwner=GetSafeHwnd(); ^b7GH9<&  
 bi.pszDisplayName=name; rtL}W__  
 bi.lpszTitle="Select folder"; .N*Pl(<[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Y_]De3:V0B  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1!.(4gV  
 if(idl==NULL) hs?sGr  
  return; +e-G,%>9  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); JqMDqPIQ  
 str.ReleaseBuffer(); %zSuK8kxV  
 m_Path=str; fwBRWr9  
 if(str.GetAt(str.GetLength()-1)!='\\')  OX"j#  
  m_Path+="\\"; ;\[(- )f!=  
 UpdateData(FALSE); y| Ir._bt  
} 1c;6xc,ub  
zcva-ze:;  
void CCaptureDlg::SaveBmp() n_B"- n  
{ La@ +>  
 CDC dc; }sx_Yj  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); hAm`NJMSO  
 CBitmap bm; VwEb7v,^0\  
 int Width=GetSystemMetrics(SM_CXSCREEN); -CRra EXf8  
 int Height=GetSystemMetrics(SM_CYSCREEN); x ul]m*Z  
 bm.CreateCompatibleBitmap(&dc,Width,Height); IXb}AxB f  
 CDC tdc; =&},;VOh  
 tdc.CreateCompatibleDC(&dc); }=|!:kiE  
 CBitmap*pOld=tdc.SelectObject(&bm); qY >{cjo  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); tqy@iEz+  
 tdc.SelectObject(pOld); V13BB44  
 BITMAP btm; ** +e7k   
 bm.GetBitmap(&btm); BbRBT@  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Q6XRsFc  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); a&k_=/X&  
 BITMAPINFOHEADER bih; lt_']QqU  
 bih.biBitCount=btm.bmBitsPixel; XfKo A0  
 bih.biClrImportant=0; V~ TWKuR  
 bih.biClrUsed=0; TO-nD>  
 bih.biCompression=0; ,:%"-`a%  
 bih.biHeight=btm.bmHeight; ) /v6l  
 bih.biPlanes=1; lw :`M2P,  
 bih.biSize=sizeof(BITMAPINFOHEADER); MCT'Nw@A  
 bih.biSizeImage=size; qVdwfT{1J  
 bih.biWidth=btm.bmWidth; B}eA\O4}I  
 bih.biXPelsPerMeter=0; UK{irU|\  
 bih.biYPelsPerMeter=0; F {B\kq8  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); |Xw/E)jA  
 static int filecount=0; '}rRzD:  
 CString name; t#S<iBAZ  
 name.Format("pict%04d.bmp",filecount++); ay %KE=*v  
 name=m_Path+name; 1-Po Z[p-R  
 BITMAPFILEHEADER bfh; $ -c!W!H  
 bfh.bfReserved1=bfh.bfReserved2=0; *A~ G_0B  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;3 F"TH  
 bfh.bfSize=54+size; >+mD$:L  
 bfh.bfOffBits=54; )NO<s0?&  
 CFile bf; M gC:b-&5_  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ T<I=%P)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); m] W5+  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); uK'&Dam  
  bf.WriteHuge(lpData,size); !gLkJ)  
  bf.Close(); dV Q-k  
  nCount++; RID]pek  
 } n3lE, b  
 GlobalFreePtr(lpData); ?X-)J=XG  
 if(nCount==1) kvh&d|  
  m_Number.Format("%d picture captured.",nCount); .c#y%S  
 else )~V4+*<  
  m_Number.Format("%d pictures captured.",nCount); X{^}\,cVtG  
  UpdateData(FALSE); TyKWy0x-3  
} .^bft P\  
Pub0IIs  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 87WBM;$&s  
{ m{7^EF  
 if(pMsg -> message == WM_KEYDOWN) = 0- $W5E  
 { U;n*j3wT  
  if(pMsg -> wParam == VK_ESCAPE) r|*&GHo L  
   return TRUE; S2>c#BQ  
  if(pMsg -> wParam == VK_RETURN) 5VO;s1  
   return TRUE; .0G6flD   
 } CdUAy|!`R  
 return CDialog::PreTranslateMessage(pMsg); N-g8}03  
} {} Bf   
uHIiH@ S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) KIeT!kmDl  
{ 5*\\J&H  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ b7/AnSR~Jt  
  SaveBmp(); A!vCb 8(TX  
  return FALSE; +p8BGNW,  
} W[[bV  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Fxc)}i`   
 CMenu pop; dDDGM:]  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kF;5L)o  
 CMenu*pMenu=pop.GetSubMenu(0); X1tXqHJF}  
 pMenu->SetDefaultItem(ID_EXITICON); t |W)   
 CPoint pt; -B$~`2-  
 GetCursorPos(&pt); u4"SH(  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); E`j-6:  
 if(id==ID_EXITICON) i-U4RZE  
  DeleteIcon(); za'6Y*CGgX  
 else if(id==ID_EXIT) hCYQGx0  
  OnCancel(); |+U<S~  
 return FALSE; HP.E3yYK  
} +Ug/rtK4   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Kd3?I5t  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0Y]0!}  
 AddIcon(); |xoF49  
 return res; IkzTJ%>  
} OquAql:   
=N);v\ Q$!  
void CCaptureDlg::AddIcon() O9(r{Vu7u  
{ `Y40w#?uW  
 NOTIFYICONDATA data; 0)m8)!gj  
 data.cbSize=sizeof(NOTIFYICONDATA); zciCcrJ  
 CString tip; .bD_R7Bi6  
 tip.LoadString(IDS_ICONTIP); U Q@7n1  
 data.hIcon=GetIcon(0); YHV-|UNF  
 data.hWnd=GetSafeHwnd(); )R_E|@"  
 strcpy(data.szTip,tip); K~RoUE<3[  
 data.uCallbackMessage=IDM_SHELL; /?/#B `  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; B`$L'  
 data.uID=98;  qW_u  
 Shell_NotifyIcon(NIM_ADD,&data); X~ Rl 6/,  
 ShowWindow(SW_HIDE); S>q>K"j^!  
 bTray=TRUE; 3ew8m}A{O  
} fU2qrcVu  
?@6/Alk  
void CCaptureDlg::DeleteIcon() *FR$vLGn  
{ 'z=:[#b  
 NOTIFYICONDATA data; XA_FOw!cX  
 data.cbSize=sizeof(NOTIFYICONDATA); +~nzii3  
 data.hWnd=GetSafeHwnd(); _U| 7'^|  
 data.uID=98; Xj+q~4{|vt  
 Shell_NotifyIcon(NIM_DELETE,&data); wyxGe<1  
 ShowWindow(SW_SHOW); :`vP}I ^  
 SetForegroundWindow(); K3GSOD>  
 ShowWindow(SW_SHOWNORMAL); ~9Cz6yF  
 bTray=FALSE; uk`8X`'  
} qIwV q!=  
iF+RnWX\  
void CCaptureDlg::OnChange() p3^jGj@  
{ >i,iOx|E-  
 RegisterHotkey(); }i!pL(8;  
} S06Hs~>Y  
f!t69nd%L  
BOOL CCaptureDlg::RegisterHotkey() \ u+xa{b|  
{ t>UkE9=3\  
 UpdateData(); tGc ya0RL  
 UCHAR mask=0; Zszs1{t  
 UCHAR key=0; (y4#.vZh:  
 if(m_bControl) o=fgin/E\  
  mask|=4; ;%q39U}  
 if(m_bAlt) Bz2'=~J  
  mask|=2; %1McD{  
 if(m_bShift) w8~K/>!f  
  mask|=1; j%Y\A~DV  
  key=Key_Table[m_Key.GetCurSel()]; BRG|Asg(  
 if(bRegistered){ s]B"qF A  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); *j)M]  
  bRegistered=FALSE; -dTLunv  
 } 0>6DSQq~t(  
 cMask=mask; \[wCp*;1}  
 cKey=key; mZ0J!QYk  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pF=g||gS  
 return bRegistered; cm>E[SHr  
} K=u0nrG*  
m)?5}ZwAH  
  四、小结 1@sM1WM X  
J_#R 87  
  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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