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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: qm}\?_  
  1gk0l'.z  
  一、实现方法 g z`*|h  
z+Z%H#9e  
  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: qAORWc  
,5kvn   
#pragma data_seg("shareddata") xv&S[=Dt  
HHOOK hHook =NULL; //钩子句柄 oB}K[3uB:t  
UINT nHookCount =0; //挂接的程序数目 %t{Sb4XZ4k  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ^\{J5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ~zj"OG"zOw  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey S|) J{~QH  
static int KeyCount =0; @Q3, bj  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %xpd(&)n  
#pragma data_seg() Yg|"-  
BDp:9yau  
  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。 rFO_fIJno  
1^tSn#j  
  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: zM\IKo_"  
)1K! [ W}t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR mCK],TOA:  
cKey,UCHAR cMask) Mb~~A5  
{ b_ZNI0Hp@  
 BOOL bAdded=FALSE; Seg#s.  
 for(int index=0;index<MAX_KEY;index++){ k!9=  
  if(hCallWnd[index]==0){ " Ac~2<V  
   hCallWnd[index]=hWnd; ;9vIa7L&  
   HotKey[index]=cKey; ]qMH=>pOsj  
   HotKeyMask[index]=cMask; Tfr`?:yF  
   bAdded=TRUE; \d ui`F"Cc  
   KeyCount++; /Go>5 B>  
   break; f!EOYowW  
  } avV mY|I  
 } wn{]#n=|l  
 return bAdded; /!-J53K  
} ,Q+\h>I  
//删除热键 _~:j3=1&n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yW{mK  
{ *b:u * `@  
 BOOL bRemoved=FALSE; X;(oz]tr$  
 for(int index=0;index<MAX_KEY;index++){ 3]!h{_:u  
  if(hCallWnd[index]==hWnd){ YK7\D:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ % kJh6J  
    hCallWnd[index]=NULL; nZ541o@t9  
    HotKey[index]=0; prqT(1  
    HotKeyMask[index]=0; u*U_7Uw$  
    bRemoved=TRUE; JR!Q,7S2!N  
    KeyCount--; -ywX5B  
    break; "2%y~jrDN  
   } m'3OGvd  
  } [#7D~Lx/  
 } f!mE1,eBEe  
 return bRemoved; ruzMag)  
} /G{&[X<4U  
8NxUx+]  
4bPqmEE  
  DLL中的钩子函数如下: Kq8 (d`g}  
sC!1B6:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) FoQ?U=er  
{ 4v0dd p  
 BOOL bProcessed=FALSE; F9v)R #u~  
 if(HC_ACTION==nCode) "OVi /:*B  
 { u"*J[M~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^M [#^wv,  
   switch(wParam) ;,mBT[_ZO  
   {  ?rAi=w&c  
    case VK_MENU: K?$ 9N}+  
     MaskBits&=~ALTBIT; a^%8QJW  
     break; ^dheJ]n=k  
    case VK_CONTROL: sN"p5p  
     MaskBits&=~CTRLBIT; /4(Z`e;0  
     break; ;tXB46  
    case VK_SHIFT: ]!]`~ Z/  
     MaskBits&=~SHIFTBIT; q|R+x7x  
     break;  ^8b~ZX  
    default: //judge the key and send message $xLEA\s  
     break; e',hC0&S  
   } F19;RaP+  
   for(int index=0;index<MAX_KEY;index++){ (6e!09P&  
    if(hCallWnd[index]==NULL) 9qnuR'BDu  
     continue; /]pX8 d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _RN/7\  
    { W]} #\\$z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u):X>??  
     bProcessed=TRUE; jG =(w4+  
    } A J<iM)l|  
   } X77A; US  
  } @gs26jX~2}  
  else if((lParam&0xc000ffff)==1){ //有键按下 37J\i ]  
   switch(wParam) <GSQ2bX[  
   { ww-XMz h  
    case VK_MENU: JqL<$mSep  
     MaskBits|=ALTBIT; A$%@fO.b  
     break; ] ,!\IqO  
    case VK_CONTROL: j@%K*Gb`  
     MaskBits|=CTRLBIT; A"Tc^Ij  
     break; (r.$%[,.<  
    case VK_SHIFT: t^`<*H  
     MaskBits|=SHIFTBIT; luJ{Iq  
     break; 5Xp$ yX =  
    default: //judge the key and send message 9`OG  
     break; *K]>}  
   } eUX@9eML  
   for(int index=0;index<MAX_KEY;index++){ z:d Xc  
    if(hCallWnd[index]==NULL) }K#iCby4  
     continue; Vww@eK%5Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e@='Q H  
    { Z}]:x `fXd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); THrc H  
     bProcessed=TRUE; (k7;  
    } EG'7}W  
   } 9m<wcZ  
  } P}ehNt*($  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ~r(g|?}P  
   for(int index=0;index<MAX_KEY;index++){ _bN))9 3  
    if(hCallWnd[index]==NULL) \W3+VG2cA  
     continue; `=_7I?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6^7)GCq [  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {Bav$kw;?e  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 m~Lf^gbG?  
   } J`U$b+q6  
  } =g{_^^n  
 } 4v rm&k  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #R~">g:w  
} S/#) :,YS  
MAsWds`bpB  
  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: u.ULS3`C/X  
k+W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sg'Y4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >=.ch5h3J)  
?K= gg<  
  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: GM34-GH+  
~EM#Hc,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =Bcux8wA#6  
{ |U;w!0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) gJWlWVeq$  
 { D'HL /[@`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分  ` 4s#5g  
  SaveBmp(); GV `idFd  
  return FALSE; &-EyM*:u!  
 } z{ Zimr  
 …… //其它处理及默认处理 Qs#9X=6e@  
} $i1>?pb3  
AxG?zBTFx  
Y/?DSo4G  
  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。 :epitpJ  
e8WPV  
  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。 +lY\r +;  
I1eb31<  
  二、编程步骤 hr/xpQW  
g4BwKENM  
  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"; B1 jH.(  
C9"f6>i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; UgOGBj,&5W  
FvtM~[Q  
  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; jk WBw.(  
K-g=td/@  
  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; &;uGIk>s  
A;/Xt  
  5、 添加代码,编译运行程序。 ;iwD/=Y  
K284R=j -&  
三、程序代码 }RC. Q`b  
ThT.iD[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL m%BMd  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3RTB~K8:{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #=)?s 8T  
#if _MSC_VER > 1000 P~b%;*m}8  
#pragma once }[hDg6i  
#endif // _MSC_VER > 1000 Aw_R $  
#ifndef __AFXWIN_H__ AR[M8RA  
#error include 'stdafx.h' before including this file for PCH Yc|-sEK/  
#endif b_)QBE9  
#include "resource.h" // main symbols ]ci|$@V  
class CHookApp : public CWinApp \k$]GK-  
{  K2vPj|  
 public: !'6J;Fb#  
  CHookApp(); B<|q{D$N/  
  // Overrides 1*eWvYo1  
  // ClassWizard generated virtual function overrides A-@-?AR  
  //{{AFX_VIRTUAL(CHookApp) //4p1^%  
 public: `"bRjC"f]  
  virtual BOOL InitInstance(); B4M'Er{v  
  virtual int ExitInstance(); EP% M8  
  //}}AFX_VIRTUAL Bt`r6v;\  
  //{{AFX_MSG(CHookApp) /ab K/8ZQ  
  // NOTE - the ClassWizard will add and remove member functions here. s]V{}bY`  
  // DO NOT EDIT what you see in these blocks of generated code ! $yxIE}  
  //}}AFX_MSG <)0LwkFtB  
  DECLARE_MESSAGE_MAP() u+, jAkr  
}; fR{WS:Pv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ":ws~Zep  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *Kp ^al  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pqNoL* H  
BOOL InitHotkey(); Di5Op(S((  
BOOL UnInit(); 37<GG)  
#endif 4=#QN  
w-q=.RSTn=  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. CsQ}P)  
#include "stdafx.h" 'E4(!H,k  
#include "hook.h" *< SU_dAh  
#include <windowsx.h> Qg8eq_m(  
#ifdef _DEBUG _oyL*Cb  
#define new DEBUG_NEW O.m.]%URW  
#undef THIS_FILE 0^-b}  
static char THIS_FILE[] = __FILE__; lfI7&d*  
#endif ]T28q/B;k  
#define MAX_KEY 100 EZu  
#define CTRLBIT 0x04 7zOvoQ}  
#define ALTBIT 0x02 >=RHE@  
#define SHIFTBIT 0x01 ~A{[=v  
#pragma data_seg("shareddata") *TMM:w|1  
HHOOK hHook =NULL; @tU>~y{E  
UINT nHookCount =0; DQHGq_unP  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey T=)L5Vuq<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT h hNFp  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey >+W?!9[p:2  
static int KeyCount =0; KTS7)2ci  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift v |hKf6  
#pragma data_seg() =*O9)$b  
HINSTANCE hins; G#=b6DB  
void VerifyWindow(); S3[oA&  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 4h2bk\z-  
//{{AFX_MSG_MAP(CHookApp) sjgxx7  
// NOTE - the ClassWizard will add and remove mapping macros here. Q0oDl8~  
// DO NOT EDIT what you see in these blocks of generated code! '\3.isTsx  
//}}AFX_MSG_MAP DW;.R<8  
END_MESSAGE_MAP() k? _$h<Y  
;:K?7wfXn  
CHookApp::CHookApp() MJk:s[o  
{ HoQ(1e$G-  
 // TODO: add construction code here, 8B(Q7Qj  
 // Place all significant initialization in InitInstance m$e@<~To  
} boHm1hPKS  
8C4@V[sm`  
CHookApp theApp; OTr!?xi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 085 ^!AZ  
{ <H(AS'  
 BOOL bProcessed=FALSE; # v/aI*Rl  
 if(HC_ACTION==nCode) P24    
 { [+5SEr}  
  if((lParam&0xc0000000)==0xc0000000){// Key up k@X As  
   switch(wParam) [O =)FiY-  
   { "q#g/T  
    case VK_MENU: yyYbB]D  
     MaskBits&=~ALTBIT; vzQmijr-  
     break; Lw78v@dY  
    case VK_CONTROL: vskM;  
     MaskBits&=~CTRLBIT; 'Y/V9;`)s  
     break; 6(Rq R  
    case VK_SHIFT: n$VPh/  
     MaskBits&=~SHIFTBIT; gj(l&F *@  
     break; 3_['[}  
    default: //judge the key and send message a>e 1jM[  
     break; L&F\"q9q71  
   } ;@$," P  
   for(int index=0;index<MAX_KEY;index++){ Lzb [%?  
    if(hCallWnd[index]==NULL) DL/*t.)"et  
     continue; W!Os ci  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kO O~%|1CP  
    { O#ajoE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N,'qMoNf  
     bProcessed=TRUE; ( ]uoN4  
    } 7*W$GCd8  
   } 5EZr"  
  } P xuz {  
  else if((lParam&0xc000ffff)==1){ //Key down pPqbD}p  
   switch(wParam) hB1iSm  
   { 5nlyb,"^g  
    case VK_MENU: \y+F!;IxL  
     MaskBits|=ALTBIT; ~<Qxw>S#  
     break; EwJn1Mvq  
    case VK_CONTROL: ; yC`5  
     MaskBits|=CTRLBIT; }z%/6`7)|  
     break; CMB$RLf  
    case VK_SHIFT: hQrsZv:Q  
     MaskBits|=SHIFTBIT; 6j.(l4}  
     break; MkIO0&0O  
    default: //judge the key and send message 2H0q\zZ  
     break; "VhrsVT  
   } 9n2%7dLQ*  
   for(int index=0;index<MAX_KEY;index++) %.  }  
   { Z)>a6s$ih<  
    if(hCallWnd[index]==NULL) q+=@kXs>+  
     continue; [ Sa C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bSKV|z/x  
    { M;@03 x W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^ C#bW <T  
     bProcessed=TRUE; *fyEw\`a  
    } dEl3?~  
   } )HiTYV)]'  
  } E.*OA y  
  if(!bProcessed){ GeR -k9  
   for(int index=0;index<MAX_KEY;index++){ 04LVa|Y@U  
    if(hCallWnd[index]==NULL) :'Kx?Es   
     continue; 15yV4wHr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) T_ #oMXZ/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;-wPXXR  
   } WUQh[A41  
  } Fd=`9N9  
 } @g` ,'r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); N`:b vr  
} `'t;BXedz/  
<OFqUp*l  
BOOL InitHotkey() JHOBg{Wg  
{ 2:0Y'\nn  
 if(hHook!=NULL){ G(,~{N||  
  nHookCount++; 6>^k9cJp  
  return TRUE; m.X+sP-e  
 } Q ?<9  
 else !q1^X% a  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); fu;B?mIn  
  if(hHook!=NULL) QE6-(/  
   nHookCount++; --hnv/AjI  
  return (hHook!=NULL); Fi}rv[`XY[  
} yM~D.D3H  
BOOL UnInit() ^d=@RTyo/  
{ Jm^jz  
 if(nHookCount>1){ qt;Tfuo  
  nHookCount--; V'4}9J  
  return TRUE; s:.XF|e{  
 } |1 6v4 R  
 BOOL unhooked = UnhookWindowsHookEx(hHook); pNsLoNZ3w  
 if(unhooked==TRUE){ z-E4-\a  
  nHookCount=0; ^vz@d+\Kd  
  hHook=NULL; \d`Sz *  
 } LR.+C xQ  
 return unhooked; u 9Tl Xn  
} - C]a2  
~#Mx&mZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U~c;W@T  
{ M)RQIl5  
 BOOL bAdded=FALSE; Q2PwO;E.`C  
 for(int index=0;index<MAX_KEY;index++){ S}I=i>QB  
  if(hCallWnd[index]==0){ hS/'b$#  
   hCallWnd[index]=hWnd; 1Ac1CsK*  
   HotKey[index]=cKey; g0$k_  
   HotKeyMask[index]=cMask; f@g  
   bAdded=TRUE; n#,l&Bx  
   KeyCount++; VAzJclB  
   break; i`s pM<iR.  
  } SZ){1Hu  
 } =l9#/G#R  
 return bAdded; CT`X~y10  
} 32/P(-  
cW%O-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^!tI+F{n{  
{ xz'd5 re%  
 BOOL bRemoved=FALSE; i)DXb  
 for(int index=0;index<MAX_KEY;index++){ SHh(ujz,  
  if(hCallWnd[index]==hWnd){ X"GQ^]$O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Hvk?(\x  
    hCallWnd[index]=NULL; QyQ8M1m  
    HotKey[index]=0; <us{4 %  
    HotKeyMask[index]=0; p+?WhxG)  
    bRemoved=TRUE; e@By@r&nql  
    KeyCount--; %j; cXN  
    break; G-<~I#k  
   } aC` c^'5  
  } v Rs5-T  
 } m$g^On  
 return bRemoved; C_)>VPD  
} <ZdNPcT<s  
}aIf IJ  
void VerifyWindow() c,ek]dTj  
{ O,v$'r W  
 for(int i=0;i<MAX_KEY;i++){ 0&~u0B{  
  if(hCallWnd!=NULL){ >c eU!=>  
   if(!IsWindow(hCallWnd)){ 3!W&J  
    hCallWnd=NULL; RkM!BcB  
    HotKey=0; bq ]a8tSB  
    HotKeyMask=0; {xH@8T$DX  
    KeyCount--; I-"{m/PEdg  
   } n5/Q)*e0'#  
  }  (v}:  
 } J_$~OEC~  
} bS<p dOX_  
0rUf'S ?K  
BOOL CHookApp::InitInstance() @9a=D<'>  
{ m ws.)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); A@r,A?(  
 hins=AfxGetInstanceHandle(); $Plk4 o*g  
 InitHotkey(); Tkf !Y?  
 return CWinApp::InitInstance(); yL-L2  
} D$;/ l}s?  
89bKnsV  
int CHookApp::ExitInstance() ,,gYU_V  
{ @d|9(,Q  
 VerifyWindow(); Q!v[b{]8  
 UnInit(); {'(8<n57  
 return CWinApp::ExitInstance(); 8),Y|4  
} TH &B9  
g~b'}^J  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6np wu5!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) a$m?if=  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %b9M\  
#if _MSC_VER > 1000 f -5ZXpWs'  
#pragma once 9m{rQ P/  
#endif // _MSC_VER > 1000 QZol( 2~Y  
3OlY Ml  
class CCaptureDlg : public CDialog .M lE1n'  
{ Z)%p,DiNM  
 // Construction e`^j_V nEH  
 public: |~Iw   
  BOOL bTray; F ReK  
  BOOL bRegistered; T*m_rDDt  
  BOOL RegisterHotkey(); 9`AQsZ2  
  UCHAR cKey; U^D7T|P$V  
  UCHAR cMask; b8&9pLl  
  void DeleteIcon(); 6s;x@g]  
  void AddIcon(); }=gGs  
  UINT nCount; <*P1Sd.  
  void SaveBmp(); O/Vue  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor "/5b3^a  
  // Dialog Data sTDBK!9I  
  //{{AFX_DATA(CCaptureDlg) FceT'  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6%-2G@6d  
  CComboBox m_Key; ,")7uMZaF\  
  BOOL m_bControl; g=Lt 2UIJ  
  BOOL m_bAlt; C'ZU .Y  
  BOOL m_bShift; {YFru6$  
  CString m_Path; ||f 4f3R'  
  CString m_Number; RiklwR#~r/  
  //}}AFX_DATA \N30SG ?o  
  // ClassWizard generated virtual function overrides ?AE%N.rnsi  
  //{{AFX_VIRTUAL(CCaptureDlg) x& S>Mr  
 public: ^&Bye?`5  
  virtual BOOL PreTranslateMessage(MSG* pMsg); _17"T0  
 protected: mD! imq%=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _ sd?l  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); CfU )+20  
  //}}AFX_VIRTUAL `0D+x  
  // Implementation OuoZd!"qf  
 protected: $)3/N&GXR  
  HICON m_hIcon; {+;8dtZ)x  
  // Generated message map functions l}x{.q7U l  
  //{{AFX_MSG(CCaptureDlg) ZfU_4Pl->  
  virtual BOOL OnInitDialog(); @u^Ib33  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 43Q&<r$[T  
  afx_msg void OnPaint(); <9"i_d%  
  afx_msg HCURSOR OnQueryDragIcon(); CJ_B.  
  virtual void OnCancel(); y3#\mBiw  
  afx_msg void OnAbout(); 4/b#$o<I?  
  afx_msg void OnBrowse();  f$3  
  afx_msg void OnChange(); y4') !e  
 //}}AFX_MSG IWkBq]Y  
 DECLARE_MESSAGE_MAP() e(Ve rd:c  
}; vjpe'zx  
#endif  DWI!\lK  
lk80)sTZ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file hY!G>d{J  
#include "stdafx.h" MEu-lM7v  
#include "Capture.h" yAOC<d9 E  
#include "CaptureDlg.h" [ LCi,  
#include <windowsx.h> m<E7cY3mX  
#pragma comment(lib,"hook.lib") kHO\#fF<  
#ifdef _DEBUG IX}l)t[:(  
#define new DEBUG_NEW 39"'Fz?1  
#undef THIS_FILE f] Vz!hM~  
static char THIS_FILE[] = __FILE__; 0*q:p`OLw*  
#endif eMs`t)rQ  
#define IDM_SHELL WM_USER+1 sb1/4u/W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HwHI$IB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vI-KH:r"{  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; MmX42;Pw  
class CAboutDlg : public CDialog U+KbvkX wj  
{ MIgIt"M jz  
 public: 7Ny>W(8  
  CAboutDlg();  m ]\L1&  
  // Dialog Data  6?6 u  
  //{{AFX_DATA(CAboutDlg) z"<PveVo  
  enum { IDD = IDD_ABOUTBOX }; |^ qW   
  //}}AFX_DATA 8]O|$8'"  
  // ClassWizard generated virtual function overrides 1g;3MSn~  
  //{{AFX_VIRTUAL(CAboutDlg) 7cC$)  
 protected: L@/+u+j0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &5B+8>  
  //}}AFX_VIRTUAL 1xw},y6T2  
  // Implementation J(Bn  n  
 protected: '&"7(8E} *  
  //{{AFX_MSG(CAboutDlg) V #=N?p  
  //}}AFX_MSG T/H*Bo *=5  
  DECLARE_MESSAGE_MAP() RR"#z'zQ  
}; 5+U~ZW0|+  
I0Vm^\8  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :7R\"@V4  
{ sIy  LW  
 //{{AFX_DATA_INIT(CAboutDlg) U}UIbJD*=  
 //}}AFX_DATA_INIT ?f%@8%px  
} (k[<>$hL*  
eN/Jb;W  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @-hy:th#  
{ r@_;L>  
 CDialog::DoDataExchange(pDX); 8'zwy d3  
 //{{AFX_DATA_MAP(CAboutDlg) c6e?)(V>  
 //}}AFX_DATA_MAP _%t w#cM  
} -/h$Yb  
]|-y[iu  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >6@UjGj54  
 //{{AFX_MSG_MAP(CAboutDlg) =/zQJzN  
 // No message handlers R)#"Ab Z'  
 //}}AFX_MSG_MAP n44j]+P  
END_MESSAGE_MAP() C ZJW`c/  
3,pRmdC  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) I!bG7;=_  
: CDialog(CCaptureDlg::IDD, pParent) m8FKr/Z-  
{ L|c01  
 //{{AFX_DATA_INIT(CCaptureDlg) mk[n3oE1  
  m_bControl = FALSE; 77)C`]0(  
  m_bAlt = FALSE; 0hPm,H*Y]  
  m_bShift = FALSE; .9`.\v6R  
  m_Path = _T("c:\\"); 0py0zE6,,  
  m_Number = _T("0 picture captured."); il:+O08_  
  nCount=0; _3)~{dQ+  
  bRegistered=FALSE; g >X!Q  
  bTray=FALSE; F.JE$)B2EX  
 //}}AFX_DATA_INIT nF7Ozxm#  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 NWTsL OIm  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -1fT2e  
} AR&u9Y)I  
&ed.%:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {~Phc 2z  
{ u\6:Txqq  
 CDialog::DoDataExchange(pDX); rl!c\  
 //{{AFX_DATA_MAP(CCaptureDlg) `DEz ` D  
  DDX_Control(pDX, IDC_KEY, m_Key); gPDc6{/C<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;0ake%v]  
  DDX_Check(pDX, IDC_ALT, m_bAlt);  M7hff4c  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 63ht|$G  
  DDX_Text(pDX, IDC_PATH, m_Path); RsY|V|<  
  DDX_Text(pDX, IDC_NUMBER, m_Number); y%43w4  
 //}}AFX_DATA_MAP ,;UVQwY  
} 'DVPx%p  
~~>D=~B0'  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) >YD? pDPb/  
//{{AFX_MSG_MAP(CCaptureDlg) " MlY G6  
 ON_WM_SYSCOMMAND() ptX;-'j(  
 ON_WM_PAINT() >i=mw5`D]  
 ON_WM_QUERYDRAGICON() ,b2Cl[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) FLi)EgZXt  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =EFF2M`F  
 ON_BN_CLICKED(ID_CHANGE, OnChange) xqIt?v2c  
//}}AFX_MSG_MAP  $ l Y  
END_MESSAGE_MAP() Fz-Bd*uS  
o ;.j_  
BOOL CCaptureDlg::OnInitDialog() $n!saPpxS  
{ _8kZ>w(L  
 CDialog::OnInitDialog(); z0a=A:+/  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); F $B _;G  
 ASSERT(IDM_ABOUTBOX < 0xF000); cu.f]'  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 9FK%"s`  
 if (pSysMenu != NULL) $5:j" )$,  
 { waldLb>7D  
  CString strAboutMenu; qY0p)`3!%  
  strAboutMenu.LoadString(IDS_ABOUTBOX); tZwZZ0]Z  
  if (!strAboutMenu.IsEmpty()) Hcuvu[)T"  
  { )V} t(>V  
   pSysMenu->AppendMenu(MF_SEPARATOR); Q R;Xj3]v  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); m%l\EE  
  } A@+pvC&  
 } | M4_@P  
 SetIcon(m_hIcon, TRUE); // Set big icon 9>%ti&_-jt  
 SetIcon(m_hIcon, FALSE); // Set small icon JuS#p5E #  
 m_Key.SetCurSel(0); u1(`^^Ml  
 RegisterHotkey(); y?;&(Tcbt8  
 CMenu* pMenu=GetSystemMenu(FALSE); eA4@)6WP(  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); an=8['X  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~[t%g9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); b v~"_)C  
 return TRUE; // return TRUE unless you set the focus to a control P;{f+I|`  
} p8frSrcU  
*ax$R6a#X  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) V~%!-7?  
{ c&J,O1){\  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 44b;]htv  
 { Z-.`JkKd8  
  CAboutDlg dlgAbout; m o nqaSF  
  dlgAbout.DoModal(); 0DV .1  
 } 5_9mA4gs@  
 else ^,qi` Tk  
 { =Z2Cg{z  
  CDialog::OnSysCommand(nID, lParam); ZXh6Se4o  
 } 'WUd7  
} V)=!pT  
*xI0hFJIM  
void CCaptureDlg::OnPaint() GMyzQ]@}  
{ |1uyJ?%B  
 if (IsIconic()) ?v p' /l"  
 { Gk g)\ 3  
  CPaintDC dc(this); // device context for painting N*gnwrP{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )OS^tG[=  
  // Center icon in client rectangle V'K1kYb  
  int cxIcon = GetSystemMetrics(SM_CXICON); := C-P7  
  int cyIcon = GetSystemMetrics(SM_CYICON); <!Ed ND=  
  CRect rect; Z.ky=vCt  
  GetClientRect(&rect); TFjb1 a,)  
  int x = (rect.Width() - cxIcon + 1) / 2; j|c  
  int y = (rect.Height() - cyIcon + 1) / 2; ;*Ldnj;B  
  // Draw the icon .Cwg l  
  dc.DrawIcon(x, y, m_hIcon); wsYvbI!  
 } Mj|\LF +  
 else Lk9X>`b#B  
 { hRHqG  
  CDialog::OnPaint(); #(=8 RA:@  
 } g4EC[>5!r  
} $F"'= +0  
Qyx%:PE  
HCURSOR CCaptureDlg::OnQueryDragIcon() =dSH8C"  
{ s]@()?.E$  
 return (HCURSOR) m_hIcon; b"DaLwKkz  
} L3/m}AH,  
V{+'(<SV  
void CCaptureDlg::OnCancel() jgNdcP  
{ 8lk@ev=O&  
 if(bTray) uxLT*,  
  DeleteIcon(); #eadkj #;  
  CDialog::OnCancel(); ""q76cx  
} 589hfET  
Dukvi;\  
void CCaptureDlg::OnAbout() jfF   
{ G<:_O-cPSv  
 CAboutDlg dlg; %/iD@2r  
 dlg.DoModal(); 0}H7Xdkp  
} @K .{o'  
W<| M0S{  
void CCaptureDlg::OnBrowse() ]wb^5H  
{ '-c *S]:r  
 CString str; /6",#B}%b  
 BROWSEINFO bi; |7ct2o~un  
 char name[MAX_PATH]; xU<WUfS1  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Sy()r 6n  
 bi.hwndOwner=GetSafeHwnd(); >J(._K  
 bi.pszDisplayName=name; F#Y9 @E  
 bi.lpszTitle="Select folder"; $r+ _Y/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; x# MMrV&M  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2[} O:  
 if(idl==NULL) 5 XtIVHA@{  
  return; fSc)PqLP  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); b$FK}D5  
 str.ReleaseBuffer(); F/p/&9  
 m_Path=str; Hw29V //  
 if(str.GetAt(str.GetLength()-1)!='\\') :`Kv\w.  
  m_Path+="\\"; gOb"-;Zw  
 UpdateData(FALSE); M]|tXo$?  
} t^Z-0jH  
kA/4W^]Ws  
void CCaptureDlg::SaveBmp() pNUe|b+P  
{ b:B+x6M  
 CDC dc; 4, EX2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^Mvgm3hg  
 CBitmap bm; 6sjd:~J:  
 int Width=GetSystemMetrics(SM_CXSCREEN); cvOCBg38BH  
 int Height=GetSystemMetrics(SM_CYSCREEN); (E(J}r~E  
 bm.CreateCompatibleBitmap(&dc,Width,Height); , L_u X  
 CDC tdc; !%X~`&9  
 tdc.CreateCompatibleDC(&dc); nIZ;N!r=i  
 CBitmap*pOld=tdc.SelectObject(&bm); -A]-o  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); '`+8'3K~E  
 tdc.SelectObject(pOld); ICdfak  
 BITMAP btm; pTeN[Yu?  
 bm.GetBitmap(&btm); 2P, %}Ms  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 2`dKnaF|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); C*X=nezq  
 BITMAPINFOHEADER bih; ibP IT!5c  
 bih.biBitCount=btm.bmBitsPixel; 3ch<a0  
 bih.biClrImportant=0; >:J7u*>$'  
 bih.biClrUsed=0; x&p.-Fi  
 bih.biCompression=0; ]C'^&:&<  
 bih.biHeight=btm.bmHeight; <S ae:m4  
 bih.biPlanes=1; Tfq7<<0$N  
 bih.biSize=sizeof(BITMAPINFOHEADER); +h ]~m_O  
 bih.biSizeImage=size; PPAcEXsIu  
 bih.biWidth=btm.bmWidth; mP*Ct6628n  
 bih.biXPelsPerMeter=0; NI  r"i2  
 bih.biYPelsPerMeter=0; (zr2b  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =0t<:-?.-  
 static int filecount=0; :%[mc-6.  
 CString name; /6 y9 u}  
 name.Format("pict%04d.bmp",filecount++); Y~TD)c=  
 name=m_Path+name; '2z1$zst,#  
 BITMAPFILEHEADER bfh; ^V}c8 P|  
 bfh.bfReserved1=bfh.bfReserved2=0; O,PTY^  
 bfh.bfType=((WORD)('M'<< 8)|'B'); w%1-_;.aU6  
 bfh.bfSize=54+size; z{H=;"+rh  
 bfh.bfOffBits=54; gCV+amP  
 CFile bf; f/95}6M  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ sEymwpm9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); YMn*i<m  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [CG3&J  
  bf.WriteHuge(lpData,size); b^:frjaE3  
  bf.Close(); ^]5^p9Jt"e  
  nCount++; k3+LP7|*  
 } 0gRm LX  
 GlobalFreePtr(lpData); 1'B&e)  
 if(nCount==1) )TfX}  
  m_Number.Format("%d picture captured.",nCount); 70<{tjyc  
 else , Dab(  
  m_Number.Format("%d pictures captured.",nCount); ??#SQSU  
  UpdateData(FALSE); V_3K((P6  
} 'pnOHT  
!tzk7D  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) M]Hf>7p  
{ T@jv0/(+  
 if(pMsg -> message == WM_KEYDOWN) 6bDizS}  
 { dOT7;@   
  if(pMsg -> wParam == VK_ESCAPE) oTJ^WePZQ  
   return TRUE; "c.@4#/_  
  if(pMsg -> wParam == VK_RETURN) s^>  >]  
   return TRUE; WES$B7y  
 } 2kcDJ{(  
 return CDialog::PreTranslateMessage(pMsg); ;e{e ?,[  
} BgT(~8'  
d`UK mj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r$:hiE@  
{ Ot+Z}Z-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )DGJr/)  
  SaveBmp(); "+M0lGTB  
  return FALSE; |LRAb#F\  
} GdYQq.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ d@%PTSX  
 CMenu pop; %Yt;)q3U  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); K&VMhMVb  
 CMenu*pMenu=pop.GetSubMenu(0); r=HL!XFk  
 pMenu->SetDefaultItem(ID_EXITICON); bU\T  
 CPoint pt; I~GHx5Dk  
 GetCursorPos(&pt); Hqtv`3g  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )(9[>_+40  
 if(id==ID_EXITICON) Ft^X[5G4L  
  DeleteIcon(); fg7  
 else if(id==ID_EXIT) LGK&&srJs  
  OnCancel(); | |L^yI~_d  
 return FALSE; K$l@0r ~k  
} j}O qWX>/  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]N2! 'c  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) D*>#]0X  
 AddIcon(); QHxof7  
 return res; H$V`,=H  
} dT0>\9ZNr  
1Va=.#<  
void CCaptureDlg::AddIcon() F9"Xu-g  
{ Z~w2m6;s  
 NOTIFYICONDATA data; O!t=,F1j  
 data.cbSize=sizeof(NOTIFYICONDATA); Ih N^*P:Fo  
 CString tip; LzxO=+=9!q  
 tip.LoadString(IDS_ICONTIP); 8|(],NyEJ  
 data.hIcon=GetIcon(0); ~{ GTL_w  
 data.hWnd=GetSafeHwnd(); :p%#U$S4  
 strcpy(data.szTip,tip); +z[+kir  
 data.uCallbackMessage=IDM_SHELL; D |=L)\  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; UhJ{MUH`  
 data.uID=98; SOZs!9oi  
 Shell_NotifyIcon(NIM_ADD,&data); )PkW,214#  
 ShowWindow(SW_HIDE); @?jtB  
 bTray=TRUE; ~0h@p4  
} 2OpkRFFa  
Be9,m!on  
void CCaptureDlg::DeleteIcon() xs&xcR R"  
{ q6ZewuV.  
 NOTIFYICONDATA data; k }{o: N  
 data.cbSize=sizeof(NOTIFYICONDATA); .Cf!5[0E  
 data.hWnd=GetSafeHwnd(); PC HKH  
 data.uID=98; 5$$# d_Gj  
 Shell_NotifyIcon(NIM_DELETE,&data); `8r$b/6  
 ShowWindow(SW_SHOW); J$PlI  
 SetForegroundWindow(); F9Af{*Jw?x  
 ShowWindow(SW_SHOWNORMAL); 4K\o2p?4  
 bTray=FALSE; !9{UBAh  
} O._\l?m  
R58NTPm  
void CCaptureDlg::OnChange() F2\&rC4v  
{ 9|3sNFGX  
 RegisterHotkey(); W/3sJc9  
} vvG"rU  
%|%eGidu  
BOOL CCaptureDlg::RegisterHotkey() 0@[*~H0{n  
{ 6#AEVRJKU@  
 UpdateData(); `x=$n5= 8  
 UCHAR mask=0;  !^8X71W|  
 UCHAR key=0; Dw.I<fns^B  
 if(m_bControl) 5F!Qn\{u{  
  mask|=4; `*elzW  
 if(m_bAlt) ak-agH  
  mask|=2; [2YPV\=  
 if(m_bShift) xjSzQ| k-  
  mask|=1; 4"H *hKp  
  key=Key_Table[m_Key.GetCurSel()]; rd<43  
 if(bRegistered){ [V>s]c<4`o  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); & Zn`2%  
  bRegistered=FALSE; o='A1P  
 } ^^zj4 }On?  
 cMask=mask; * nFzfV  
 cKey=key; e(N},s:_  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); BU4IN$d0Po  
 return bRegistered; "GR*d{  
} vcsSi%M\U  
"*t0 t  
  四、小结 Mk0x#-F  
 '6})L  
  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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