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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/Y9uYn  
  8b6:n1<fn  
  一、实现方法 Pvbw>k;  
r)U9u 0  
  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: pxDZ}4mOh  
&(Xp_3PO  
#pragma data_seg("shareddata") \Cx3^ i X  
HHOOK hHook =NULL; //钩子句柄 ->8n.!F}  
UINT nHookCount =0; //挂接的程序数目 {a% T <WW  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &S3szhe  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @H7dQ, %  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey `I6)e{5t  
static int KeyCount =0; 2eyvY|:Q>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 jWP(7}U  
#pragma data_seg() G@,qO#5&  
Lc<Gn y^  
  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。 mUnn k`v  
2Q1* Xq{  
  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: &^&k]JBaV  
<@;eN&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR jUBlIVl]  
cKey,UCHAR cMask) J )@x:,o  
{ ~POe0!}  
 BOOL bAdded=FALSE; w5qhKu!1  
 for(int index=0;index<MAX_KEY;index++){ v[ F_r  
  if(hCallWnd[index]==0){ {(xNC#   
   hCallWnd[index]=hWnd; Ai#W. n  
   HotKey[index]=cKey; #-e3m/>  
   HotKeyMask[index]=cMask; 8&`s wu&  
   bAdded=TRUE; xo^_;(;  
   KeyCount++; (Ca\$p7/  
   break; T3M 4r|  
  } QI`Z[caF  
 } XUW~8P  
 return bAdded; n6|}^O7  
} r}*2~;:pW  
//删除热键 $R7d*\(G  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z)6bqU<LQE  
{ $Fd9iJ!k  
 BOOL bRemoved=FALSE;   ;h  
 for(int index=0;index<MAX_KEY;index++){ .bL{fBTT~  
  if(hCallWnd[index]==hWnd){ LR9dQ=fHS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ T(ponLh  
    hCallWnd[index]=NULL; wond>m 3  
    HotKey[index]=0; ce+\D'q[  
    HotKeyMask[index]=0; iW)FjDTP  
    bRemoved=TRUE; vcV=9q8P1  
    KeyCount--; Mc76)  
    break; xwK<f6H!y  
   } Y*J`Wf(w  
  } d/R:-{J)c  
 } mYa0_P%^  
 return bRemoved; W e9C9)0  
} mE^6Zu  
<7^_M*F9  
(sr_& 7A  
  DLL中的钩子函数如下: /l:3* u  
PPE:@!u<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) , JVD ;u  
{ }\l5|Ft[!  
 BOOL bProcessed=FALSE; QD"V=}'?  
 if(HC_ACTION==nCode) Q@]#fW\Y  
 { M%9PVePOe  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 k}jH  
   switch(wParam) ~!)_3o  
   {  :2?i9F0_  
    case VK_MENU: /6L\`\g  
     MaskBits&=~ALTBIT; ;O{AYF?,N  
     break; .bnoK  
    case VK_CONTROL: CXA)Zl5#  
     MaskBits&=~CTRLBIT; fyQAQZT  
     break; =>ph\  
    case VK_SHIFT: -Frx{3  
     MaskBits&=~SHIFTBIT; G]q6Ika  
     break; ~>#=$#V   
    default: //judge the key and send message :Q&8DC#]  
     break; J0|/g2%0  
   } q/%f2U%4:  
   for(int index=0;index<MAX_KEY;index++){ 6S`eN\s  
    if(hCallWnd[index]==NULL) 9^Wj<  
     continue; CE*@CkC0z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M^g"U`  
    { %&z9^}Vd[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,ci tzh  
     bProcessed=TRUE; JrCm >0g  
    } Fz>J7(Y.j  
   } dc%+f  
  } Is?0q@  
  else if((lParam&0xc000ffff)==1){ //有键按下 6ng . =  
   switch(wParam) qIO)Z   
   { ULQ*cW&;?  
    case VK_MENU: 2} 509X(*  
     MaskBits|=ALTBIT; jF-z?  
     break; 5 QMu=/  
    case VK_CONTROL: dw Aju:-H  
     MaskBits|=CTRLBIT; i:{a-Bd  
     break; Y.Gr(]tk  
    case VK_SHIFT: tr/S*0$  
     MaskBits|=SHIFTBIT; KY4|C05 ,  
     break; atW;S99#  
    default: //judge the key and send message J. {[>  
     break; pw&l.t6.  
   } v*]|1q%/  
   for(int index=0;index<MAX_KEY;index++){ 5=Gq d4&*  
    if(hCallWnd[index]==NULL) =@{H7z(p&  
     continue; W13$-hf9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hQl3F6-ud  
    { ZJ+q<n_4}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G%rK{h  
     bProcessed=TRUE; gpE5ua&  
    } ot-!_w<  
   } $IB@|n  
  } "R):B~8|H{  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 O!/J2SfuDH  
   for(int index=0;index<MAX_KEY;index++){ bO^%#<7  
    if(hCallWnd[index]==NULL) =_L"x~0I-  
     continue; 1Qf5H!5vx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Mgf80r=  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &)\0mpLK9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 JJ7-$h'0q  
   } QD / | zi  
  } Y@#~8\_  
 } eMWY[f3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); m6'YFpf)V  
} "L{;=-e  
oPre$YT}h  
  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: $@Hw DRP  
p?8> 9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); : <m0 GG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); AO/J:`  
i3#]_ p{  
  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: yUNl)E  
vxbO>c   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V-J\!CHX  
{ B.{0,b W?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) C"hc.A&4  
 { gKS^-X{x  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 tTQ>pg1{qh  
  SaveBmp(); PjRKYa_U  
  return FALSE; 3tOnALv  
 } QE-t v00  
 …… //其它处理及默认处理 l2n>Wce9  
} I>ofSaN  
8kO|t!?:U  
b4,yLVi<T  
  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。 tEf-BV;\y  
2R|2yAh  
  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。 0/-[k  
R,6?1Z:J  
  二、编程步骤 EeL~`$f  
!~>u\h  
  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"; :Wb+&|dU  
&=_YL  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )[%#HT  
9)H~I/9Y  
  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; :@YZ6?hf  
i,b>&V/Y$  
  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; #(XP=PUj  
iCz,|;w%  
  5、 添加代码,编译运行程序。 =o+t_.)N  
Lqwc:%Y:_  
三、程序代码 g($y4~#  
N2q'$o  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~-'nEATE  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) aD%")eP%&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ X0P<ifIv  
#if _MSC_VER > 1000 C]eb=rw$  
#pragma once P#76ehR]K  
#endif // _MSC_VER > 1000 shP,-Vs #  
#ifndef __AFXWIN_H__ #gi&pR'$  
#error include 'stdafx.h' before including this file for PCH W;Fcp  
#endif =]etw  
#include "resource.h" // main symbols J#'c+\B<2X  
class CHookApp : public CWinApp CUY2eQJ{U  
{ %Ix^Xb0  
 public: 2/(gf[elX  
  CHookApp(); tPFV6n i  
  // Overrides L(AY)gB  
  // ClassWizard generated virtual function overrides y{"8VT)  
  //{{AFX_VIRTUAL(CHookApp) L88oh&M  
 public: lD 9'^J  
  virtual BOOL InitInstance(); )UN@|IX  
  virtual int ExitInstance(); D Q~+\  
  //}}AFX_VIRTUAL  UIhB  
  //{{AFX_MSG(CHookApp) cBc6*%ZD  
  // NOTE - the ClassWizard will add and remove member functions here. !k%Vw1 8  
  // DO NOT EDIT what you see in these blocks of generated code ! hM+nA::w  
  //}}AFX_MSG s )_sLt8?  
  DECLARE_MESSAGE_MAP() 9SMM%(3, r  
}; u3c e\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ><^A4s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tXPS@4F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i[WTp??Uv  
BOOL InitHotkey(); U4^dDj  
BOOL UnInit(); W\FKA vS  
#endif WS2TOAya)  
a Se.]_  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. vmW4a3  
#include "stdafx.h" d+"KXt5CV  
#include "hook.h" hb^e2@i;Oq  
#include <windowsx.h> @HaWd 3  
#ifdef _DEBUG N[r@Y{  
#define new DEBUG_NEW ygT,I+7\  
#undef THIS_FILE /m9t2,KB  
static char THIS_FILE[] = __FILE__; /C3=-Hp  
#endif &/Tx@j^.C  
#define MAX_KEY 100 = `70]%  
#define CTRLBIT 0x04 .RoO 6:T6  
#define ALTBIT 0x02 Y@;bA=Du}  
#define SHIFTBIT 0x01 /kNr5s  
#pragma data_seg("shareddata") aD0w82s]J  
HHOOK hHook =NULL; Q7`zrCh  
UINT nHookCount =0; .8fOc.h8h  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Gz ^g!N[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 0^{zq|%Q!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey M!mTNIj8~  
static int KeyCount =0; A5 8i}G9  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift z?FZu,h}  
#pragma data_seg() `p'L3u5H-  
HINSTANCE hins; 'pZ~3q  
void VerifyWindow(); ~hP[[?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) <}.)kg${O  
//{{AFX_MSG_MAP(CHookApp) dk;Ed  
// NOTE - the ClassWizard will add and remove mapping macros here. AGOK%[[Ws  
// DO NOT EDIT what you see in these blocks of generated code! )M^;6S  
//}}AFX_MSG_MAP b]CJf8'u  
END_MESSAGE_MAP() M`iJ6L  
&[JI L=m5  
CHookApp::CHookApp() P),%S9jP;  
{ NL2n\%n  
 // TODO: add construction code here, Zw"6-h4  
 // Place all significant initialization in InitInstance M,y='*\M  
} ]FQ4v.7  
E2%7v  
CHookApp theApp; H$\?D+xlf  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) hoSk  
{ s7T=/SC54  
 BOOL bProcessed=FALSE; 2yeq2v   
 if(HC_ACTION==nCode) !YAkHrF`[0  
 { H${Ym BG  
  if((lParam&0xc0000000)==0xc0000000){// Key up O(WFjmHx  
   switch(wParam) _BcB@a  
   { OJkPlDym  
    case VK_MENU: f~W.i]  
     MaskBits&=~ALTBIT; (}] 74Lc  
     break; "ZT=[&2  
    case VK_CONTROL: v-OGY[|97  
     MaskBits&=~CTRLBIT; $0cMrf@  
     break; _%<7!|"  
    case VK_SHIFT: b*.)m  
     MaskBits&=~SHIFTBIT; PS \QbA  
     break; TSE(Kt  
    default: //judge the key and send message >+1^XeeS  
     break; c WK@O>  
   } \U~ggg0h  
   for(int index=0;index<MAX_KEY;index++){ VO++(G)  
    if(hCallWnd[index]==NULL) zA-?x1th&  
     continue; }qb z&%R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) s?OGB}  
    { zA( 2+e 7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); APK@Oq  
     bProcessed=TRUE; r+$ 0u~^  
    } SHz& o[u  
   } eb.`Q+Gb  
  } { SK8Mdn  
  else if((lParam&0xc000ffff)==1){ //Key down kl2]#G(  
   switch(wParam) ]l+2Ca:-[j  
   { /Tv< l  
    case VK_MENU: oHeo]<Fbv  
     MaskBits|=ALTBIT; 'fK_J}+P  
     break; hRc\&+#/  
    case VK_CONTROL: kv`x  
     MaskBits|=CTRLBIT; r!Mr\  
     break; Q9W*)gBv n  
    case VK_SHIFT: UP,0`fh(y  
     MaskBits|=SHIFTBIT; T_YN^za(q  
     break; azOp53zR  
    default: //judge the key and send message Q5ohaxjF  
     break; S5bk<8aPP  
   } KHF5Nt  
   for(int index=0;index<MAX_KEY;index++) <<n8P5pXt  
   { F!aYK2  
    if(hCallWnd[index]==NULL) 9(u2jbA  
     continue; TD\QX2m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Lg9ktRKK  
    { hkW"D<i i-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T 0^U ]C  
     bProcessed=TRUE; U0)(k}Q)  
    } Qy4AuMU2  
   } Z/Mp=273  
  } Za=<euc7  
  if(!bProcessed){ :Z1_;`>CT  
   for(int index=0;index<MAX_KEY;index++){ yd>kJk^~/  
    if(hCallWnd[index]==NULL) rZ0@GA  
     continue; XUMCz7&j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Or6'5e?N  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9';0vrFeM  
   } ts9N$?0:V  
  } *?\2Ohp  
 } _#N~$   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); GI6 EZ}.MZ  
} B_}=v$  
bM;tQ38*  
BOOL InitHotkey() ~(hmiNa;  
{ })&0e:6  
 if(hHook!=NULL){ ixfkMM ,W  
  nHookCount++; 5|H?L@_9  
  return TRUE; vz@QGgQ9~2  
 } ~Bu~?ZJmd  
 else X>*zA?:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); G.<9K9K  
  if(hHook!=NULL) C'zMOR6c  
   nHookCount++; tx5@r;  
  return (hHook!=NULL); -U; s,>\)  
} KZD&Ih(vC  
BOOL UnInit() ,[cWG)-  
{ E}" &? oY  
 if(nHookCount>1){ %M'"%Yn@(y  
  nHookCount--; X}p4yR7'  
  return TRUE; BAzqdG  
 } lkw[Z}\  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Li<c  
 if(unhooked==TRUE){ k$I[F<f  
  nHookCount=0; Dw.>4bA.  
  hHook=NULL; 7a@V2cr@  
 } ,ew<T{PL  
 return unhooked; ",~3&wx  
} '# (lq5 c  
?$r+#'asd(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3&2,[G04  
{ U ][.ioc  
 BOOL bAdded=FALSE; V(w[`^I>~  
 for(int index=0;index<MAX_KEY;index++){ ^P{'l^CVX  
  if(hCallWnd[index]==0){ hXM C!~Th  
   hCallWnd[index]=hWnd; Ea P#~x  
   HotKey[index]=cKey; +S3'ms  
   HotKeyMask[index]=cMask; %81tVhg  
   bAdded=TRUE; `_<AZ{&&  
   KeyCount++; qTffh{q V  
   break; dB_\,%vAd  
  } ]FFU,me2  
 } /Ee0S8!Z!1  
 return bAdded; 2<B+ID3qv  
} P *%bG 4  
MfYe @ ;m  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1noFXzeU3  
{ `5!7Il  
 BOOL bRemoved=FALSE; S3 x:]E:   
 for(int index=0;index<MAX_KEY;index++){ &Kjqdp  
  if(hCallWnd[index]==hWnd){ A= ,q&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K-vso4@BJ  
    hCallWnd[index]=NULL; }i/{8Ou W  
    HotKey[index]=0; 0Fi7|  
    HotKeyMask[index]=0; qBCZ)JEN#U  
    bRemoved=TRUE; Sb,{+Wk  
    KeyCount--; RNi&OG(  
    break; Oe;9[=L[  
   } {J99F  
  } 7:1Hgj(  
 } kg !@i7  
 return bRemoved; VQ}=7oe%q  
} "%}PVO!  
KDn`XCnk,  
void VerifyWindow() yGN<.IP75  
{ `ZNjA},.  
 for(int i=0;i<MAX_KEY;i++){ jj.yB#T  
  if(hCallWnd!=NULL){ w$& 10  
   if(!IsWindow(hCallWnd)){ [&Qrk8EN  
    hCallWnd=NULL; (Ojg~P4;&  
    HotKey=0; 8fDnDA.e  
    HotKeyMask=0; Dnd  
    KeyCount--; s"sX# l[J  
   } y:v0& 9L  
  } #z5'5|3  
 } {AcKBi b  
} *XNvb ^<  
 c<4pu  
BOOL CHookApp::InitInstance() v4qvq GK  
{ H=wmN0s{<  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); K IqF"5  
 hins=AfxGetInstanceHandle(); g8vN^nQf[  
 InitHotkey(); gzC\6ca  
 return CWinApp::InitInstance(); !\!fd(BN  
} ?m~;*wn%  
Ke\?;1+  
int CHookApp::ExitInstance() 1"!<e$&$X  
{ F<^,j7@  
 VerifyWindow(); 7p~@S4  
 UnInit(); AS8T!  
 return CWinApp::ExitInstance(); Ky$ <WZs  
} 1x\%VtO>\b  
4uTYuaCNs  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +J#H9>To!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *^NC5=A(d  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0?sIod  
#if _MSC_VER > 1000 TuX#;!p6  
#pragma once lSbAZ6  
#endif // _MSC_VER > 1000 S:t7U %  
u`("x5sa  
class CCaptureDlg : public CDialog "+)ey> _  
{ DE. Pw+5<.  
 // Construction l+T\DZ  
 public: %GHHnf%2Z  
  BOOL bTray; #b{otc)  
  BOOL bRegistered; 6}<PBl%qe  
  BOOL RegisterHotkey(); ['sIR+c%'O  
  UCHAR cKey; t(ZiQ<A  
  UCHAR cMask; Z9!goI  
  void DeleteIcon(); y`\/eX  
  void AddIcon(); .oSKSld  
  UINT nCount; @NV$!FB<  
  void SaveBmp(); S'?XI@t[  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Z0-W%W  
  // Dialog Data |1t30_ /gS  
  //{{AFX_DATA(CCaptureDlg) Nzr zLK  
  enum { IDD = IDD_CAPTURE_DIALOG }; WM>9sJf  
  CComboBox m_Key; d/* [t!   
  BOOL m_bControl; w0 "h,{  
  BOOL m_bAlt; (j cLzq  
  BOOL m_bShift; HPU7 `b4  
  CString m_Path; v3~,1)#aI  
  CString m_Number; 6o{anHBB  
  //}}AFX_DATA e"2 wXd_}  
  // ClassWizard generated virtual function overrides JQ.ZAhv  
  //{{AFX_VIRTUAL(CCaptureDlg) nYE_WXY3V  
 public: qk:F6kL\`  
  virtual BOOL PreTranslateMessage(MSG* pMsg); OP<@Xz  
 protected: wRLkO/Fw  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Kj'm<]u  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Rfgc^3:j  
  //}}AFX_VIRTUAL VJ1si0vWtq  
  // Implementation o 'yR^`  
 protected: X1A;MA@0Ro  
  HICON m_hIcon; 4;j #7  
  // Generated message map functions yqB{QFXO  
  //{{AFX_MSG(CCaptureDlg) op}x}Ioz  
  virtual BOOL OnInitDialog(); }F@`A?k  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); <H#D/?n5  
  afx_msg void OnPaint(); 'g ,Oi1|~  
  afx_msg HCURSOR OnQueryDragIcon(); 44S<(Re  
  virtual void OnCancel(); D./e|i?  
  afx_msg void OnAbout(); [KCh,'&  
  afx_msg void OnBrowse(); (:@qn+ a  
  afx_msg void OnChange(); 2{{M{#}S.  
 //}}AFX_MSG C~6aX/:  
 DECLARE_MESSAGE_MAP() [*50Ng>P`  
}; b7"pm)6  
#endif SHh g&~B  
A #ZaXu/:X  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "\> <UJ  
#include "stdafx.h" )Hw;{5p@  
#include "Capture.h" [q_Yf!(m-  
#include "CaptureDlg.h" ~6@~fhu  
#include <windowsx.h> auS$B %  
#pragma comment(lib,"hook.lib") ?VReKv1\  
#ifdef _DEBUG f^0vkWI2  
#define new DEBUG_NEW }3N8EmS  
#undef THIS_FILE `uGX/yQ#=  
static char THIS_FILE[] = __FILE__; 7p2x}[ .\  
#endif 9]hc{\  
#define IDM_SHELL WM_USER+1 #H5*]"w6I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3+!N[6Od9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ue-HO  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; XFd[>U<X  
class CAboutDlg : public CDialog sRY: 7>eg  
{ @ZT25CD  
 public: +mAMCM2N  
  CAboutDlg(); }g(aZ  
  // Dialog Data ?#]c{Tlpz  
  //{{AFX_DATA(CAboutDlg) >5]Xl*{H)  
  enum { IDD = IDD_ABOUTBOX }; vA+RZ  
  //}}AFX_DATA `W|2Xi=^5  
  // ClassWizard generated virtual function overrides "7gS*v,r  
  //{{AFX_VIRTUAL(CAboutDlg) ;'cv?3Y  
 protected: Lu-owP7nB  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @NX^__ sa  
  //}}AFX_VIRTUAL MA"iM+Ar  
  // Implementation ]>:%:-d6  
 protected: s31^9a  
  //{{AFX_MSG(CAboutDlg) @dcW0WQ\  
  //}}AFX_MSG qf7.Sh  
  DECLARE_MESSAGE_MAP() C'mmo&Pd  
}; s-k-|4  
eW\_9E)cY  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ir/2/ E  
{ ~\XB'  
 //{{AFX_DATA_INIT(CAboutDlg) d9sgk3K  
 //}}AFX_DATA_INIT WhK?>u  
} -?@ $`{-K  
3)GXu>) t  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) u}#rS%SF*  
{ Fbk<qQH  
 CDialog::DoDataExchange(pDX); y(N-1  
 //{{AFX_DATA_MAP(CAboutDlg) `DJIY_{-2  
 //}}AFX_DATA_MAP R2M,VK?Wx  
} 8f29Hj+  
E1VCm[j2  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?F`lI""E  
 //{{AFX_MSG_MAP(CAboutDlg) H&%=>hyX  
 // No message handlers fpoH7Jd V  
 //}}AFX_MSG_MAP J-u,6c  
END_MESSAGE_MAP() t,MK#Ko  
i|=}zR  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Sw(%j1uL  
: CDialog(CCaptureDlg::IDD, pParent) V <k_Q@K  
{ u1nv'\*  
 //{{AFX_DATA_INIT(CCaptureDlg) c~c3;  
  m_bControl = FALSE; xaS kn  
  m_bAlt = FALSE; $H5PB' b  
  m_bShift = FALSE; `D#l(gZ  
  m_Path = _T("c:\\"); 6"%[s@C  
  m_Number = _T("0 picture captured."); e {c.4'q  
  nCount=0; #|$7. e  
  bRegistered=FALSE; oNiS"\t  
  bTray=FALSE; !3T x\a`?/  
 //}}AFX_DATA_INIT %/U Q0d~b  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 KAUYE^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9:BGA/?  
} 7<NX;Fx  
A"9aEOX-?i  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) flb3Iih  
{ c&R .  
 CDialog::DoDataExchange(pDX); .+B!mmp  
 //{{AFX_DATA_MAP(CCaptureDlg) Fs&m'g  
  DDX_Control(pDX, IDC_KEY, m_Key); TF3Tha]  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); OFUN hbg  
  DDX_Check(pDX, IDC_ALT, m_bAlt); dQizM^j  
  DDX_Check(pDX, IDC_SHIFT, m_bShift);  H) (K  
  DDX_Text(pDX, IDC_PATH, m_Path); pX*mX]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); d2(eX\56Z  
 //}}AFX_DATA_MAP )bcMKZ   
} -Fl3m  
8q0f#/`v  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :0srFg?X  
//{{AFX_MSG_MAP(CCaptureDlg) e3[QM  
 ON_WM_SYSCOMMAND() W>@+H"pZ  
 ON_WM_PAINT() =`/X Wem  
 ON_WM_QUERYDRAGICON() r#{lpF,3Ib  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) V-X n&s  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) MvRuW:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *|`'L  
//}}AFX_MSG_MAP o}Xp-P   
END_MESSAGE_MAP() 2y<d@z:K  
[s7I.rdGzz  
BOOL CCaptureDlg::OnInitDialog() ^_<pc|1  
{ IA+>dr  
 CDialog::OnInitDialog(); 6 a$%  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tKJ) 'v?  
 ASSERT(IDM_ABOUTBOX < 0xF000); NZ.aI{  
 CMenu* pSysMenu = GetSystemMenu(FALSE); bF flA  
 if (pSysMenu != NULL) {8"W  
 { :ss9-  
  CString strAboutMenu; [hFyu|I !  
  strAboutMenu.LoadString(IDS_ABOUTBOX); pXQ&2s$  
  if (!strAboutMenu.IsEmpty()) ^Jkj/n'  
  { {'vvE3iZ  
   pSysMenu->AppendMenu(MF_SEPARATOR); 3^`bf=R  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); w=f8UtY9@A  
  } ^Xb!dnT.*a  
 } JP@UvDE|  
 SetIcon(m_hIcon, TRUE); // Set big icon mKn[>M1  
 SetIcon(m_hIcon, FALSE); // Set small icon 0,/[r/=jT  
 m_Key.SetCurSel(0); {'X"9@  
 RegisterHotkey(); As>po +T*  
 CMenu* pMenu=GetSystemMenu(FALSE); -eNi;u  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *}2o \h6Q  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2.:b   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); f<zh-Gq  
 return TRUE; // return TRUE unless you set the focus to a control B! -W765Y  
} j#~4JGZt  
2C-RoZ~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $jc>?.6  
{ OPjscc5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %M^bZ?  
 { 8[y7(Xw  
  CAboutDlg dlgAbout; zd;xbH//)b  
  dlgAbout.DoModal(); w'qV~rN~tc  
 } rhUZ9Fdv  
 else 89 lPeFQ`  
 { )<Yy.Z_:DC  
  CDialog::OnSysCommand(nID, lParam); jEI!t^#  
 } .^v7LF]Q  
} \LS%bO,Y|  
as\V, {<  
void CCaptureDlg::OnPaint() ~ 01]VA  
{ 82w< q(  
 if (IsIconic()) k5PzY!N  
 { Dk7"#q@kx  
  CPaintDC dc(this); // device context for painting E3KP jK  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |0 Zj/1<$  
  // Center icon in client rectangle +~[19'GH  
  int cxIcon = GetSystemMetrics(SM_CXICON); <4>6k7W  
  int cyIcon = GetSystemMetrics(SM_CYICON); bRIb'%=+GA  
  CRect rect; W>, b1_k c  
  GetClientRect(&rect); 4<O[d  
  int x = (rect.Width() - cxIcon + 1) / 2; 1-b,X]i  
  int y = (rect.Height() - cyIcon + 1) / 2; I]$kVa1iN  
  // Draw the icon ,$G89jSM  
  dc.DrawIcon(x, y, m_hIcon); "iKK &%W  
 } CP?\'a"Kt  
 else m.4y=69 &  
 { Q.8Jgel1  
  CDialog::OnPaint(); &MKv _  
 } Vj:PNt[  
} oF3#]6`;/  
0u0Hl%nl  
HCURSOR CCaptureDlg::OnQueryDragIcon() 2s(K4~ee  
{ !-7(.i-  
 return (HCURSOR) m_hIcon; [Q%3=pm_  
} 8.A; I<  
"%Rx;xw|  
void CCaptureDlg::OnCancel() Su-+~` "  
{ ,*bxNs'/  
 if(bTray) j5RM S V  
  DeleteIcon(); #G\)ZheG  
  CDialog::OnCancel(); u{_T,k<!  
} Y- w5S|!  
2Nj0 Hqjq  
void CCaptureDlg::OnAbout() `bxgg'V  
{ r<0 .!j%c  
 CAboutDlg dlg; a-kU?&* y  
 dlg.DoModal(); h<QXr'4+  
} }ShZ4 xMz  
g:*yjj  
void CCaptureDlg::OnBrowse() AU7c = H:?  
{ [PU.lRq  
 CString str; 7%F9.h  
 BROWSEINFO bi; $AX!L+<!  
 char name[MAX_PATH]; }LE/{]A  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 'Y-c*q  
 bi.hwndOwner=GetSafeHwnd(); )qxL@w.  
 bi.pszDisplayName=name; c8u&ev.U  
 bi.lpszTitle="Select folder"; jy1*E3vQ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; DLz~$TF^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); w.V8-9{  
 if(idl==NULL) H- S28%.  
  return; E]e6a^J#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); bZKK' d$I  
 str.ReleaseBuffer(); \dCdyl6V  
 m_Path=str; $QY(7Z"  
 if(str.GetAt(str.GetLength()-1)!='\\') g,q&A$Wi  
  m_Path+="\\"; a(<nk5  
 UpdateData(FALSE); z?K+LTf8  
} RLIugz{IH  
d:j$!@o  
void CCaptureDlg::SaveBmp() O!|:ZMjF  
{ sNNt0q(  
 CDC dc; O c" 2|X  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;1o"Oij  
 CBitmap bm; #2`tsZ]=I  
 int Width=GetSystemMetrics(SM_CXSCREEN); &-&6ARb7o  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0phGn+"R  
 bm.CreateCompatibleBitmap(&dc,Width,Height); h?idRaN_  
 CDC tdc; b0 5h,  
 tdc.CreateCompatibleDC(&dc); {0[qERj"z  
 CBitmap*pOld=tdc.SelectObject(&bm); *W0`+#Dcv  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); DsP+#PX  
 tdc.SelectObject(pOld); Nlo*vu  
 BITMAP btm; } $OQw'L[  
 bm.GetBitmap(&btm);  _@HMk"A  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; _E?(cWC  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8" \>1{^  
 BITMAPINFOHEADER bih; Nc]]e+N#V  
 bih.biBitCount=btm.bmBitsPixel; Ok,hm.|  
 bih.biClrImportant=0; e0aeiG$/0  
 bih.biClrUsed=0; L >xN7N3&m  
 bih.biCompression=0; T}g;kppC  
 bih.biHeight=btm.bmHeight; nGg>lRL  
 bih.biPlanes=1; ;[*7UE+#7  
 bih.biSize=sizeof(BITMAPINFOHEADER); F02NnF  
 bih.biSizeImage=size; |KkVt]ZQe9  
 bih.biWidth=btm.bmWidth; oS]XE!^M  
 bih.biXPelsPerMeter=0; Ldig/:  
 bih.biYPelsPerMeter=0; *VD-c  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ./[t'dgC  
 static int filecount=0; x0 3|L!n  
 CString name; F*(<`V  
 name.Format("pict%04d.bmp",filecount++); (h2bxfV~+  
 name=m_Path+name; UW40Y3W0  
 BITMAPFILEHEADER bfh; "&>$/b$  
 bfh.bfReserved1=bfh.bfReserved2=0; f v}h;?C  
 bfh.bfType=((WORD)('M'<< 8)|'B'); <<[`;"CF  
 bfh.bfSize=54+size; ] $Z aS\m  
 bfh.bfOffBits=54; P=V~/,>SZ!  
 CFile bf; rs<UWk<q  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ z m_mLk$4H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5B"j\TwQ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); k(V#{ YP  
  bf.WriteHuge(lpData,size); S3.Pqp_<  
  bf.Close(); $n>.;CV  
  nCount++; 8+lM6O ~!  
 } <@JK;qm>S  
 GlobalFreePtr(lpData); & [4Gv61  
 if(nCount==1) )6Hc Pso6  
  m_Number.Format("%d picture captured.",nCount); bluhiiATd  
 else ~%>ke  
  m_Number.Format("%d pictures captured.",nCount); PT|t6V"wd  
  UpdateData(FALSE); / bfLox  
} >^kRIoBkg  
: 3*(kb1)&  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) tP7l ;EX4  
{ IJ[#$I+Z%  
 if(pMsg -> message == WM_KEYDOWN) z[[|'02{  
 { b,~6cDU  
  if(pMsg -> wParam == VK_ESCAPE) = gOq >`  
   return TRUE; c]#F^(-A`  
  if(pMsg -> wParam == VK_RETURN) ub7|'+5  
   return TRUE; /+iU1m'(  
 } Uz[#t1*  
 return CDialog::PreTranslateMessage(pMsg); ?%#3p[  
} [gx6e 44  
wxN'Lv=R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t4~Bn<=  
{ P^T]Ubv"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -n+ =[M  
  SaveBmp(); eG=Hyc  
  return FALSE; E2+O-;VN  
} ALJ^XvB4V  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ auK*\Wjm?  
 CMenu pop; e@w-4G(;  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); %?@N-$j  
 CMenu*pMenu=pop.GetSubMenu(0); g >u{H:  
 pMenu->SetDefaultItem(ID_EXITICON); /X; [ 9&  
 CPoint pt; `ZC_F! E  
 GetCursorPos(&pt); lN -vFna  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *FmY4w  
 if(id==ID_EXITICON) v[A)r]"j"M  
  DeleteIcon(); ^FIpkhw  
 else if(id==ID_EXIT) #2^eGhwnI  
  OnCancel(); 2mRm.e9?  
 return FALSE; ]>B>.s  
} R %aed>zo  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); M4~^tML>Ey  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) .SAOE'Foo  
 AddIcon(); Lzm9Kh;  
 return res; ER;?[!  
} fX^ <H_1$G  
. =yF  
void CCaptureDlg::AddIcon() Hyh$-iCa  
{ O3 x9S,1i  
 NOTIFYICONDATA data; Pp#  
 data.cbSize=sizeof(NOTIFYICONDATA); qkPvE;"  
 CString tip; =C gcRxng  
 tip.LoadString(IDS_ICONTIP); wxS.!9K  
 data.hIcon=GetIcon(0); ga%gu9  
 data.hWnd=GetSafeHwnd(); 8Qd*OO  
 strcpy(data.szTip,tip); IT!u4iH[  
 data.uCallbackMessage=IDM_SHELL; +" |?P  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; z10J8Ms'  
 data.uID=98; 'I^3r~_  
 Shell_NotifyIcon(NIM_ADD,&data); pMndyuoJl  
 ShowWindow(SW_HIDE); KxhMPvN'  
 bTray=TRUE; +-"uJIwMD  
} ;&RBg+Pr  
| KY6IGcqV  
void CCaptureDlg::DeleteIcon() sVWOh|O[W  
{ _c$l@8KS^  
 NOTIFYICONDATA data; !8~A`  
 data.cbSize=sizeof(NOTIFYICONDATA); .FYxVF.  
 data.hWnd=GetSafeHwnd(); w#0/&\ b=  
 data.uID=98; ~}Xd{afo  
 Shell_NotifyIcon(NIM_DELETE,&data); !Pd@0n4  
 ShowWindow(SW_SHOW); "{>BP$Jz  
 SetForegroundWindow(); n-P<y  
 ShowWindow(SW_SHOWNORMAL); 1u>[0<U~E  
 bTray=FALSE; ,yf2kU  
} !p #m?|Km  
g6aIS^mU  
void CCaptureDlg::OnChange() GO4IAUA  
{ )d(F]uV:y  
 RegisterHotkey(); %La<]  
} :O)\+s-  
q#D-}R_RN  
BOOL CCaptureDlg::RegisterHotkey() 5NGQWg  
{ >L4q>S^v  
 UpdateData(); 5y^I~"_ i  
 UCHAR mask=0; Z#uxa  
 UCHAR key=0; (r*"}"ZG  
 if(m_bControl) c6-~PKJL  
  mask|=4; 9 n0 ?0mk  
 if(m_bAlt) ? $$Xg3w_#  
  mask|=2; `s8*n(\h  
 if(m_bShift) K4U_sCh#f  
  mask|=1;  KEPNe(H  
  key=Key_Table[m_Key.GetCurSel()]; *3@ =XY7  
 if(bRegistered){ (sDZ&R  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); vd{ban9  
  bRegistered=FALSE; 'Hf+Y/`  
 } <DR$WsDG  
 cMask=mask; 12]rfd   
 cKey=key; Dm{9;Abs%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); p ; ]Qxh  
 return bRegistered; >uLWfk+y1  
} H^ds<I<)  
e92,@  
  四、小结 2y`X)  
KwAc Ga}J  
  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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