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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: =T0;F0@#4  
  6~@S,i1  
  一、实现方法 f,_EPh>  
WK<:(vu.  
  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: wVms"U.  
SL O~   
#pragma data_seg("shareddata") ~dFdO7  
HHOOK hHook =NULL; //钩子句柄 CC<(V{Png  
UINT nHookCount =0; //挂接的程序数目 6|-V{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 WE|-zo  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 'q_^28rK  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey S);SfNh%CL  
static int KeyCount =0; x  #Um`  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 RrG5`2  
#pragma data_seg() P wY~L3,  
$yA>j (k4  
  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。 hN3*]s;/6z  
K_" denzT+  
  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: CC8)yO  
t(R Jc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR &# ?2zbZ  
cKey,UCHAR cMask) <V~B8C!)  
{ 'fGB#uBt  
 BOOL bAdded=FALSE; 8NJxtT~0c~  
 for(int index=0;index<MAX_KEY;index++){ aA|<W g  
  if(hCallWnd[index]==0){ ,3As Ng  
   hCallWnd[index]=hWnd; P,}cH;w6Ck  
   HotKey[index]=cKey; P~H?[ ;  
   HotKeyMask[index]=cMask; m'b9 f6  
   bAdded=TRUE; ; m]KKB  
   KeyCount++; 2.>WR~ \  
   break; [K=M; $iQ  
  } o;zU;pkB  
 } \Xr Sn_p-  
 return bAdded; a At<36{?  
} <U]!1  
//删除热键 6Kbc:wlR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $Sx(vq6(  
{ !'jZ !NFO  
 BOOL bRemoved=FALSE; 6VsgZ"Il  
 for(int index=0;index<MAX_KEY;index++){ RI[=N:C^  
  if(hCallWnd[index]==hWnd){ p" ;5J+?(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J dK' ~-L  
    hCallWnd[index]=NULL; 1LK`    
    HotKey[index]=0; L2,.af6+  
    HotKeyMask[index]=0; b5@sG^  
    bRemoved=TRUE; &qjc+-r{l  
    KeyCount--; .S{FEV  
    break; jGSY$nt9  
   } F+m%PVW:  
  } 9Ev<t \B  
 } "?X,);5S  
 return bRemoved; [B,w\PLub  
} t4P`#,:8  
<l.l6okp  
^7Hwpn7E  
  DLL中的钩子函数如下: Sf>#Zqj/  
hb.^ &  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^5D%)@~  
{ AbExJ~JV\g  
 BOOL bProcessed=FALSE; n6xJ  
 if(HC_ACTION==nCode) k',#T932x1  
 { _u{z$;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [pRRBMho  
   switch(wParam) N8E  
   {  3!u`PIQv  
    case VK_MENU: z|$M,?r'  
     MaskBits&=~ALTBIT; w:VD[\h  
     break; (Qcd !!   
    case VK_CONTROL:  ;H4s[#K  
     MaskBits&=~CTRLBIT; A/c#2  
     break; Q;xJ/4 Z"  
    case VK_SHIFT: r6Qsh CA"  
     MaskBits&=~SHIFTBIT; +Zg@X.z  
     break; E Xxv  
    default: //judge the key and send message ogvB{R  
     break; t+ vz=`  
   } 67g"8R#.V  
   for(int index=0;index<MAX_KEY;index++){ YW2h#PV6_  
    if(hCallWnd[index]==NULL) (uVL!%61k  
     continue; &~a S24c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N`HiNb [  
    { 4Jf9N'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); F;L8FL-  
     bProcessed=TRUE; 0NF=7 j  
    } sR4B/1'E  
   }  &<LBz|  
  } < 2SWfH1>  
  else if((lParam&0xc000ffff)==1){ //有键按下 6E#znRi6IE  
   switch(wParam) CUN1.i<pk8  
   { cSTF$62E  
    case VK_MENU: p/U{*i ]t  
     MaskBits|=ALTBIT; .%EYof  
     break; :2.<JUDM  
    case VK_CONTROL: mKBO<l{S  
     MaskBits|=CTRLBIT; k2O3{xIjc  
     break; "WzKJwFr  
    case VK_SHIFT: !pZ<{|cH  
     MaskBits|=SHIFTBIT; PbnAY{J  
     break; RcC5_@W  
    default: //judge the key and send message q5G`q&O5  
     break; ALQ-aXJ  
   } /Nkxb&  
   for(int index=0;index<MAX_KEY;index++){ +Qf<*  
    if(hCallWnd[index]==NULL) ?C`r3  
     continue; . 1+I8qj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ms#rvn!J  
    { TwsI8X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); fC".K Yjp  
     bProcessed=TRUE; <aLS4  
    } O 6ph_$nt.  
   } CTS1."kx1  
  } ;0U*N& f  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 k1.%ZZMM  
   for(int index=0;index<MAX_KEY;index++){ uBl&{$<  
    if(hCallWnd[index]==NULL) Wu"1M^a  
     continue; TuEM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JW!.+ Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); fy$?~Ji &  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 &1Cs'  
   } %!r.) Wx|2  
  } /,_m\ JkwL  
 } Qvty;2$o@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6?Kl L [~  
} !6l*Jc3  
,5x#o  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ?;y-skh  
5DDSo0E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'J$@~P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $ x:N/mMu`  
QWnGolN  
  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: dr(-k3ex  
L9<\vJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vm[F~2+HX  
{ ;?k<L\zaw  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) e=l:!E10  
 { )o<^6Ic%7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ' '(rC38  
  SaveBmp(); 51`&%V{daL  
  return FALSE; Jt[,V*:#  
 } L$ i:~6  
 …… //其它处理及默认处理 <:Mz2Rg  
} `KN>0R2k  
F(#?-MCs  
lKB9n}P  
  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。 qDG2rFu&[  
7FJ4;HLQ  
  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。 .$H"j>  
k qL.ZR  
  二、编程步骤 3C<G8*4);/  
*/l;e<E  
  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"; w|6/i/X  
&y}7AV  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; /OWwC%tM/  
{x?qz~W  
  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; ^~.AV]t|  
OxYAM,F  
  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; 5 ty2e`~K  
e b} P/  
  5、 添加代码,编译运行程序。 1C8xJ6F  
l'/`2Y1  
三、程序代码 a_V\[V{R=  
GdcXU:J /  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL e`s1z|h  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /wLGf]0  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ $TmEVC^ 0  
#if _MSC_VER > 1000 ",.f   
#pragma once ZX` \so,&,  
#endif // _MSC_VER > 1000 Gk{ 'U  
#ifndef __AFXWIN_H__ :Y\ ~[Y  
#error include 'stdafx.h' before including this file for PCH 5, ,~k=  
#endif jwT` Z  
#include "resource.h" // main symbols A4!X{qUT-  
class CHookApp : public CWinApp fJ[ ^_,O  
{ C[<}eD4bV  
 public: UuWIT3W>%  
  CHookApp(); `z\hQ%1!F  
  // Overrides 88~Nrl=co  
  // ClassWizard generated virtual function overrides y\Aa;pL)RQ  
  //{{AFX_VIRTUAL(CHookApp) 3"7Q[9Oj  
 public: -0d9,,c  
  virtual BOOL InitInstance(); 1hY|XZ%qd  
  virtual int ExitInstance(); L@{'J  
  //}}AFX_VIRTUAL wn5OgXxG<  
  //{{AFX_MSG(CHookApp) <rj'xv  
  // NOTE - the ClassWizard will add and remove member functions here. J)>DsQ+Cj  
  // DO NOT EDIT what you see in these blocks of generated code ! !iKW1ks  
  //}}AFX_MSG M5ZH6X@5  
  DECLARE_MESSAGE_MAP() ]]PNYa  
}; Kf:!tRE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); P}}G9^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z3uR1vF'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +PjTT6  
BOOL InitHotkey(); A7Ql%$v7^  
BOOL UnInit(); qU !dg  
#endif {&n- @$?  
ZOEe-XW  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ?Ts]zO%%Z  
#include "stdafx.h" f?UI+TU  
#include "hook.h" +d6onO{8  
#include <windowsx.h> R%WY!I8C  
#ifdef _DEBUG TRGpE9i  
#define new DEBUG_NEW k sv]  
#undef THIS_FILE S&` 6pN  
static char THIS_FILE[] = __FILE__; @KTuG ?.  
#endif ^YLC{V  
#define MAX_KEY 100 u2oS Ci  
#define CTRLBIT 0x04 [f_^B U&  
#define ALTBIT 0x02 }ssV"5M  
#define SHIFTBIT 0x01 /aI@2]|~  
#pragma data_seg("shareddata") v0\l~_|H  
HHOOK hHook =NULL; .t_t)'L  
UINT nHookCount =0; &s+l/;3  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ;d6Dm)/(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT N:<$]x>  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey eTa_RO,x  
static int KeyCount =0; t(#9.b`W)  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ?}KRAtJ8  
#pragma data_seg() &>zH.6%$  
HINSTANCE hins; @ wR3L:@  
void VerifyWindow(); i//H5D3  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) dipfsH]p  
//{{AFX_MSG_MAP(CHookApp) % "(&a'B  
// NOTE - the ClassWizard will add and remove mapping macros here. 9-;-jnDy  
// DO NOT EDIT what you see in these blocks of generated code! <gF]9%2E  
//}}AFX_MSG_MAP 5bLNQz\WJ  
END_MESSAGE_MAP() bTum|GWf  
|8k1Bap`z  
CHookApp::CHookApp() mXRkR.zu+  
{ |{N{VK  
 // TODO: add construction code here, s* (a  
 // Place all significant initialization in InitInstance ,.<mj !YE  
} XRV]u|w=g  
axnlI*!  
CHookApp theApp; i(j/C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;:6\w!fc  
{ 1"H;Tr|  
 BOOL bProcessed=FALSE; n~ *|JJ*`  
 if(HC_ACTION==nCode) NI s7v  
 { E8!`d}\#  
  if((lParam&0xc0000000)==0xc0000000){// Key up fQfn7FaW_\  
   switch(wParam) [|Qzx w9  
   { Vf cIR(  
    case VK_MENU: *BsK6iVb  
     MaskBits&=~ALTBIT; O52 /fGt  
     break; UMGiJO\yH  
    case VK_CONTROL: C8-7XQ=B:b  
     MaskBits&=~CTRLBIT; MKBDWLCB  
     break; w)EY j+L  
    case VK_SHIFT: (GC]=  
     MaskBits&=~SHIFTBIT; ok\-IU?  
     break; ?9~^QRLT  
    default: //judge the key and send message *5feB#  
     break; Cy;UyZ  
   } y\skke]  
   for(int index=0;index<MAX_KEY;index++){ >bW=oTFz  
    if(hCallWnd[index]==NULL) {M**a  
     continue; )]P(!hW.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c~ R'`Q  
    { %B$ftsYXmu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *{ rorir  
     bProcessed=TRUE; P{o)Ir8Tt  
    } ZwUBeyxS=c  
   } +M-tYE 5n  
  } hE&6;3">  
  else if((lParam&0xc000ffff)==1){ //Key down zZ%[SW&vC  
   switch(wParam)  >. K  
   { vJ&_-CX   
    case VK_MENU: ~Gfytn9x.;  
     MaskBits|=ALTBIT; GLf!i1Z  
     break; ?EFRf~7JP  
    case VK_CONTROL: _WEJ,0* #'  
     MaskBits|=CTRLBIT; hY&Yp^"}]^  
     break; ^-"Iw y  
    case VK_SHIFT: uPfz'|,  
     MaskBits|=SHIFTBIT; OFtaOjsyUa  
     break; =|?`5!A  
    default: //judge the key and send message od)TQSo  
     break; QY;(Ny/(y  
   } KfiSQ!{  
   for(int index=0;index<MAX_KEY;index++) 9S%5 Z>  
   { 1/97_:M0~F  
    if(hCallWnd[index]==NULL)  vD#U+  
     continue; 6|eqQ+(A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E f\|3D_  
    { +pR,BjY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); YmC}q20;  
     bProcessed=TRUE;  t;o\"H  
    } <wS J K  
   } AX v q~XE  
  } w % Hj'  
  if(!bProcessed){ n[jXqFm!`  
   for(int index=0;index<MAX_KEY;index++){ H,% bKl#  
    if(hCallWnd[index]==NULL) $'V^_|EL7  
     continue; U6&`s%mIa  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) XM:BMd|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); I/(U0`%  
   } U"r*kO%  
  } Jx+6Kq(  
 } $]DuO1H./  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); pbx*Y`v  
} UVw^t+n  
{?`rGJ{f  
BOOL InitHotkey() Ic0Sb7c  
{ bL7Gkbs&|  
 if(hHook!=NULL){ a}@b2Wc*  
  nHookCount++; SMZ*30i  
  return TRUE; XY'=_5t  
 } '/I`dj  
 else k{+cFG\C&  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); JQKXbsXS  
  if(hHook!=NULL) b\"F6TF:  
   nHookCount++; $V87=_}  
  return (hHook!=NULL); L/u|90) L  
} LLgw1 @-D  
BOOL UnInit() J&aN6l?  
{ @}q, ';H7  
 if(nHookCount>1){ *O$|,EsY  
  nHookCount--;  LgF?1?  
  return TRUE; ] 0R*F30]  
 } i*|HN"!  
 BOOL unhooked = UnhookWindowsHookEx(hHook); nFlN{_/  
 if(unhooked==TRUE){ Qf_N,Bq{a  
  nHookCount=0; hF-QbO  
  hHook=NULL; 4XAB_Q  
 } h{)m}"n<R  
 return unhooked; M]o]D;N~l  
} z- q.8~Z  
Zz} o  t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {qw'gJmX  
{ sK%b16#  
 BOOL bAdded=FALSE; ;> 7~@ K  
 for(int index=0;index<MAX_KEY;index++){ \IQG%L{  
  if(hCallWnd[index]==0){ ;l%xjMcU  
   hCallWnd[index]=hWnd; a~yiLq  
   HotKey[index]=cKey; ?eTZ>o.p/  
   HotKeyMask[index]=cMask; e;vI XJE  
   bAdded=TRUE; |}d^lQ9  
   KeyCount++; .M:&Aj)x16  
   break; zYM2`(Z 5B  
  } _gVihu  
 } 4]1/{</B|  
 return bAdded; ZW?h\0Hh  
} vL_yM  
o+x%q<e;c  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {U-z(0  
{ }h1BAKg  
 BOOL bRemoved=FALSE; h_ t`)]-  
 for(int index=0;index<MAX_KEY;index++){ v^eAQoFLhN  
  if(hCallWnd[index]==hWnd){ { 5r]G  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ox SSEs  
    hCallWnd[index]=NULL; HxK'u4I  
    HotKey[index]=0; l8E))oz1T  
    HotKeyMask[index]=0; Q7u|^Gu,5  
    bRemoved=TRUE; npeL1zO-$  
    KeyCount--; t!wbT79/  
    break; >yc),]1~  
   } Vw ;iE=L  
  } f IV"U  
 } &DGqY5=  
 return bRemoved; "`K_5"F  
} \@PMj"p|:  
Zs^zD;zU  
void VerifyWindow() YAR$6&  
{ VP< zOk7  
 for(int i=0;i<MAX_KEY;i++){ ~98q1HgS]D  
  if(hCallWnd!=NULL){ C2LG@iCIE  
   if(!IsWindow(hCallWnd)){ $Ud9v4  
    hCallWnd=NULL; V@+sNM  
    HotKey=0; X,@nD@  
    HotKeyMask=0; 4+qo=i  
    KeyCount--; G>^= Bm_$  
   } R)d_0Ng  
  } 7/&taw%i  
 } fBTNI`#  
} &7kLSb&|;  
0F uj-q  
BOOL CHookApp::InitInstance() $o9^b Z  
{ *} *HXE5  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); c-zW 2;|61  
 hins=AfxGetInstanceHandle(); yo5-x"ze  
 InitHotkey(); #U'}g *  
 return CWinApp::InitInstance(); ?`vGpi~  
} ,P`:`XQ>_B  
\B 8j9  
int CHookApp::ExitInstance()  Dt5AG  
{ kK/>,Eg  
 VerifyWindow(); hRKJKQ@7  
 UnInit(); J}Z\I Y,  
 return CWinApp::ExitInstance(); cl23y}J_?  
} Hv"qRuQ?[  
PtPx(R3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file K\}qY dPF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5:+x7Ed  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <_8eOL<X  
#if _MSC_VER > 1000 -iy17$  
#pragma once Y}}1]}VIK  
#endif // _MSC_VER > 1000 >]Mhkf/=)  
B*`[8kb,  
class CCaptureDlg : public CDialog `j2|aX %Z*  
{ v*y,PY1*  
 // Construction ZdhA:}~^E  
 public: Ayw {I#"  
  BOOL bTray; f#38QP-T  
  BOOL bRegistered; c[6<UkH7  
  BOOL RegisterHotkey(); u<\Sf"fs  
  UCHAR cKey; 7Or?$  
  UCHAR cMask; \J~@r1  
  void DeleteIcon(); u~t%GIg  
  void AddIcon(); j%S} T)pX  
  UINT nCount; !':y8(Ou  
  void SaveBmp(); 9-Qu5L~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor N mNj0&  
  // Dialog Data lA,[&  
  //{{AFX_DATA(CCaptureDlg) #cl|5jm+m#  
  enum { IDD = IDD_CAPTURE_DIALOG }; Y>i Qp/k:  
  CComboBox m_Key; _Pw5n mH c  
  BOOL m_bControl; \!)1n[N  
  BOOL m_bAlt; FYaBP;@J%  
  BOOL m_bShift; #FGj)pu  
  CString m_Path; :Mu]* N  
  CString m_Number; 0VgsV;  
  //}}AFX_DATA #9(iu S+BU  
  // ClassWizard generated virtual function overrides N@? z&urQi  
  //{{AFX_VIRTUAL(CCaptureDlg) jJkc vC8d  
 public: Nk\/lK\  
  virtual BOOL PreTranslateMessage(MSG* pMsg); f2P2wt.$  
 protected: T ^`R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Coe%R(x5  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); p ^I#9(PT  
  //}}AFX_VIRTUAL lt C  
  // Implementation :N=S nyz  
 protected: a [BIY&/Q  
  HICON m_hIcon; d r=h;[Q'  
  // Generated message map functions OLJ|gunA#  
  //{{AFX_MSG(CCaptureDlg) dJ,,yA*  
  virtual BOOL OnInitDialog(); sc# q03  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); KupQtT<  
  afx_msg void OnPaint(); u3vw[k  
  afx_msg HCURSOR OnQueryDragIcon(); ;0 9~#Wop  
  virtual void OnCancel(); U'xmn$ O  
  afx_msg void OnAbout(); 8Dc'"3+6  
  afx_msg void OnBrowse(); &(X-b"2  
  afx_msg void OnChange(); d/I*$UC  
 //}}AFX_MSG 3B ;aoejHm  
 DECLARE_MESSAGE_MAP() >f~y2YAr  
}; {r[g.@  
#endif fJOA5(  
^14a[ta/'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ,a@jg&Mb]  
#include "stdafx.h" UV)!zgP  
#include "Capture.h" |D[4 G6&  
#include "CaptureDlg.h" K2oyHw<mk  
#include <windowsx.h> 0bI} s`sr  
#pragma comment(lib,"hook.lib") ~`CWpc:  
#ifdef _DEBUG @]:GTrs  
#define new DEBUG_NEW !Im{-t  
#undef THIS_FILE ,wH]|`w  
static char THIS_FILE[] = __FILE__; v^Pjvv=  
#endif rTYMN  
#define IDM_SHELL WM_USER+1 wD`jks  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z/[ww8b.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Hyz:i)2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8al%F_r]  
class CAboutDlg : public CDialog M@78.lPS  
{ nG !6[^D  
 public: =MokbK2  
  CAboutDlg(); o" e]9{+<  
  // Dialog Data ~{gV`nm=J  
  //{{AFX_DATA(CAboutDlg) )2y# cM*  
  enum { IDD = IDD_ABOUTBOX }; zQyt1&!  
  //}}AFX_DATA .Fn7yTQ%  
  // ClassWizard generated virtual function overrides Ld:U~M-  
  //{{AFX_VIRTUAL(CAboutDlg) {Z{!tR?+  
 protected: -_"6jU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support QwgP+ M+  
  //}}AFX_VIRTUAL :PF6xL&  
  // Implementation u40<>A  
 protected: L<M H:  
  //{{AFX_MSG(CAboutDlg) &Uu8wFbIJ  
  //}}AFX_MSG A1V^Gi@i  
  DECLARE_MESSAGE_MAP() _h8|shyP  
}; l5esx#([*R  
x72T5.  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ij9ezNZT=  
{ Y>2kOE  
 //{{AFX_DATA_INIT(CAboutDlg) { x/~gp  
 //}}AFX_DATA_INIT UKBaGX:v  
} ]B3\IT  
o!>h Q#h  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S"G`j!m1  
{ 'n4$dv% q  
 CDialog::DoDataExchange(pDX);  El:&  
 //{{AFX_DATA_MAP(CAboutDlg) BEnIyVU;L  
 //}}AFX_DATA_MAP s2ixiv=  
} ^4 ?LQ[t'  
< k?jt  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) W$ag |WV  
 //{{AFX_MSG_MAP(CAboutDlg) @<,YUp,%S  
 // No message handlers vv5 uU8  
 //}}AFX_MSG_MAP >* >}d%  
END_MESSAGE_MAP() S1D=' k]  
vo JmNH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /7[X_)OG  
: CDialog(CCaptureDlg::IDD, pParent) rwSmdJ~  
{ }6!*H!  
 //{{AFX_DATA_INIT(CCaptureDlg) U+wfq%Fz  
  m_bControl = FALSE; 3C7}V{?  
  m_bAlt = FALSE; Vp j[)W%L  
  m_bShift = FALSE; ZI/Ia$O  
  m_Path = _T("c:\\"); bfl%yGkd/|  
  m_Number = _T("0 picture captured."); S @[B?sNj  
  nCount=0; 7r,h[9~e  
  bRegistered=FALSE; |VxO ,[~  
  bTray=FALSE; 7t~12m8x  
 //}}AFX_DATA_INIT ~rICPR  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 _m2p>(N|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $>=?'wr  
} 7IUu] Fi  
aq-R#q  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hX&Jq%{oa  
{ w9Z,3J6r  
 CDialog::DoDataExchange(pDX); ;N;['xcx;  
 //{{AFX_DATA_MAP(CCaptureDlg) W_%@nm\y  
  DDX_Control(pDX, IDC_KEY, m_Key); Bq4^nDK  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); O|I)HpG;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); t`oH7)nut  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); xR`M#d5"  
  DDX_Text(pDX, IDC_PATH, m_Path); FQW{c3%qZ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); iz @LS  
 //}}AFX_DATA_MAP @=G6fW:  
} %=EN 3>,  
x}B_;&>&"_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) (HD8Mm  
//{{AFX_MSG_MAP(CCaptureDlg) 2=V~n)'a  
 ON_WM_SYSCOMMAND() 5%1a!M M M  
 ON_WM_PAINT() {$fd?| 9h  
 ON_WM_QUERYDRAGICON() i}E&mv'  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |O4LR,{G.w  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) !Pf6UNN'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) [oS4W P  
//}}AFX_MSG_MAP 7wB*@a-  
END_MESSAGE_MAP() [B+]F~}@  
nC2e^=^  
BOOL CCaptureDlg::OnInitDialog() 8 LH\a.>  
{ aTU[H~dTU  
 CDialog::OnInitDialog(); UZJ<|[  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); f<;w1sM\  
 ASSERT(IDM_ABOUTBOX < 0xF000); WkUV)/j  
 CMenu* pSysMenu = GetSystemMenu(FALSE); iPeW;=-2Wk  
 if (pSysMenu != NULL) c]1\88  
 { _6!@>`u~  
  CString strAboutMenu; Kd;Iu\4hv  
  strAboutMenu.LoadString(IDS_ABOUTBOX); CEHtr90P  
  if (!strAboutMenu.IsEmpty()) 4157!w'\y  
  { (N[R`LN  
   pSysMenu->AppendMenu(MF_SEPARATOR); -.!+i8d>  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); o>i@2_r\&H  
  } }|u>b!7_.  
 } tB)nQw7  
 SetIcon(m_hIcon, TRUE); // Set big icon 67D{^K"KT  
 SetIcon(m_hIcon, FALSE); // Set small icon &w'1  
 m_Key.SetCurSel(0); Or3GrZ!H  
 RegisterHotkey(); (\$=de>?  
 CMenu* pMenu=GetSystemMenu(FALSE); k;V (rf`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); qac8zt#2 C  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);  U!O"f  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Gr8%%]1!0  
 return TRUE; // return TRUE unless you set the focus to a control J|=0 :G  
} f~t5[D(\Q,  
,Z$!:U  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !=bGU=^  
{ d\-v+'d*+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,,=VF(@G  
 { GFTOP%Tgl  
  CAboutDlg dlgAbout; /CXQ&nwY9=  
  dlgAbout.DoModal(); FFq8LM8  
 } :`B70D8ku  
 else 51gSbkVX  
 { @p%WFNR0  
  CDialog::OnSysCommand(nID, lParam); !x[].Urj  
 } l8H8c &  
} ?*L{xNC#  
>UnLq:G  
void CCaptureDlg::OnPaint() 1YScZ  
{ nq qqP  
 if (IsIconic()) jp880}  
 { I_5[-9  
  CPaintDC dc(this); // device context for painting o3cE.YUF  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7* R %zJ  
  // Center icon in client rectangle zK>}x=  
  int cxIcon = GetSystemMetrics(SM_CXICON); p735i`8  
  int cyIcon = GetSystemMetrics(SM_CYICON); 9_x rw:4  
  CRect rect; k2/t~|5  
  GetClientRect(&rect); q+2v9K@  
  int x = (rect.Width() - cxIcon + 1) / 2; 3FG'A[x3O  
  int y = (rect.Height() - cyIcon + 1) / 2; N{#9gr3zi  
  // Draw the icon rEwd76?  
  dc.DrawIcon(x, y, m_hIcon); y<kg;-& 8  
 } #H;1)G(/  
 else VQ;'SY:`  
 { _0o65?F  
  CDialog::OnPaint(); dlH&8  
 } KEjMxOv1  
} 2 $Umqt  
sspGB>h8l  
HCURSOR CCaptureDlg::OnQueryDragIcon() HdRwDW@7=  
{ } 8[  
 return (HCURSOR) m_hIcon; &2r[4  
} {~`{bnx^]7  
Ze?n Q-  
void CCaptureDlg::OnCancel() |]eWO#vs  
{ .UYhj8  
 if(bTray) kTA4!654  
  DeleteIcon(); {wD:!\5  
  CDialog::OnCancel(); umN4|X  
} #xw3a<z?u  
M_h8{  
void CCaptureDlg::OnAbout() nd"$gi  
{ JC# 5CCz  
 CAboutDlg dlg; ?Kg_bvoR  
 dlg.DoModal(); O-ppR7edh  
} T%aM~dp  
NH4T*R)Vz  
void CCaptureDlg::OnBrowse() ;Irn{O  
{ ;Kh?iq n^  
 CString str; p@U[fv8u  
 BROWSEINFO bi; <8^ws90Y  
 char name[MAX_PATH]; HLPY%VeD  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); u7  
 bi.hwndOwner=GetSafeHwnd(); ccT <UIpq  
 bi.pszDisplayName=name;  |CAMdU  
 bi.lpszTitle="Select folder"; 4m6/ ba  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; K5F;/ KR"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); T(Ji%S >  
 if(idl==NULL) 7C wWf  
  return; Kw(S<~9-@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); N~P1^x~  
 str.ReleaseBuffer(); i:Gyi([C  
 m_Path=str; <fHN^O0TS  
 if(str.GetAt(str.GetLength()-1)!='\\') )Myx(w"S  
  m_Path+="\\"; *y', eB  
 UpdateData(FALSE); @}pcj2K#  
} 9CAu0N5<  
;rV+eb)I  
void CCaptureDlg::SaveBmp() 7>h(M+ /  
{ ez~u A4  
 CDC dc; g_rk_4]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); o#>Mf464I  
 CBitmap bm; WWC&-Ni  
 int Width=GetSystemMetrics(SM_CXSCREEN); ([#'G+MC&  
 int Height=GetSystemMetrics(SM_CYSCREEN); G @EEh.s9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ^Jw=5 ImG  
 CDC tdc; f4VdH#eng`  
 tdc.CreateCompatibleDC(&dc); KGc!#C  
 CBitmap*pOld=tdc.SelectObject(&bm); SVObJsB^  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); w`v` aw]  
 tdc.SelectObject(pOld); S(/ ^_Y  
 BITMAP btm; nJ$2RN  
 bm.GetBitmap(&btm); ia,5=SKJ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; '6\ZgOO9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); wd3OuDrU  
 BITMAPINFOHEADER bih; "H=N>=g0E  
 bih.biBitCount=btm.bmBitsPixel; EMpq+LrN  
 bih.biClrImportant=0; *3s-=.U~  
 bih.biClrUsed=0; f$vU$>+[  
 bih.biCompression=0; Y!+H9R  
 bih.biHeight=btm.bmHeight; %gWQ}QF  
 bih.biPlanes=1; M+%qVwp  
 bih.biSize=sizeof(BITMAPINFOHEADER); KzQFG)q,  
 bih.biSizeImage=size; 4iZg2"[D  
 bih.biWidth=btm.bmWidth; [WV&Y,E  
 bih.biXPelsPerMeter=0; mg" _3].j  
 bih.biYPelsPerMeter=0; ]z#)XW3#i  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (?TK P 7  
 static int filecount=0; Xk1uCVUe5  
 CString name; :4\%a4{Ie  
 name.Format("pict%04d.bmp",filecount++); `VvQems  
 name=m_Path+name; ]{|lGtK %  
 BITMAPFILEHEADER bfh; apt$e$g  
 bfh.bfReserved1=bfh.bfReserved2=0; u,{R,hTDS  
 bfh.bfType=((WORD)('M'<< 8)|'B'); x-W~&`UU  
 bfh.bfSize=54+size; ><xmw=  
 bfh.bfOffBits=54; W*Ow%$%2  
 CFile bf; 1hSV/%v_  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ A&M(a  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?\(qA+iP0  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); FBvh7D.hV  
  bf.WriteHuge(lpData,size); %*o  
  bf.Close(); 8 nL9#b  
  nCount++; |=KzQY|u  
 } oI'& &Bt  
 GlobalFreePtr(lpData); UFu0{rY_  
 if(nCount==1) l)~ U8  
  m_Number.Format("%d picture captured.",nCount); q'4P/2)va  
 else -~4r6ZcA  
  m_Number.Format("%d pictures captured.",nCount); z]-m<#1  
  UpdateData(FALSE); uA;#*eiA/  
} {`e-%<  
~j(vGO3JB  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) t\'MB  
{ yla- X|>  
 if(pMsg -> message == WM_KEYDOWN) z>iXNwz"?  
 { pLCS\AUTsv  
  if(pMsg -> wParam == VK_ESCAPE) 0 f$96sl  
   return TRUE; wa{!%qu5.R  
  if(pMsg -> wParam == VK_RETURN) Km!ACA&s6  
   return TRUE; IG{Me  
 } nB5\ocJ  
 return CDialog::PreTranslateMessage(pMsg); 4;3Vc%  
} NZa 7[}H  
*W`7JL,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =:zPT;K  
{ i+_=7(e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ zi_$roq=)  
  SaveBmp(); Pk;yn;  
  return FALSE; =S\^j"  
} 3$q#^UvD  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *s-s1v  
 CMenu pop; 'DNxc  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5c(g7N  
 CMenu*pMenu=pop.GetSubMenu(0); TC44*BHq  
 pMenu->SetDefaultItem(ID_EXITICON); esE!i0%  
 CPoint pt; i$$h6P#  
 GetCursorPos(&pt); & 0\:MJc  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?U[6X| 1  
 if(id==ID_EXITICON) MRK=\qjD  
  DeleteIcon(); @: =vK?8L  
 else if(id==ID_EXIT) @ S[As~9X  
  OnCancel(); =nc;~u|]  
 return FALSE; a^|9rho<  
} [! wJIy?,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &A.0(s  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) W)J5[p?  
 AddIcon(); \`["IkSg7  
 return res; 2Xk;]-T!  
} ]!P8{xmb@  
4)k-gKS*  
void CCaptureDlg::AddIcon() :_:)S  
{ NqD Hrx  
 NOTIFYICONDATA data; B8"c+<b  
 data.cbSize=sizeof(NOTIFYICONDATA); i2(v7Gef  
 CString tip; 9W]OtSG  
 tip.LoadString(IDS_ICONTIP); r-L& ee   
 data.hIcon=GetIcon(0); XNfl  
 data.hWnd=GetSafeHwnd(); r-xP 6  
 strcpy(data.szTip,tip); 3{t[>O;  
 data.uCallbackMessage=IDM_SHELL; :[(%4se  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; C96*,.j~'  
 data.uID=98; vzbGLap#  
 Shell_NotifyIcon(NIM_ADD,&data); $N}t)iA  
 ShowWindow(SW_HIDE); v=hn# U  
 bTray=TRUE; m a@V>*u  
} H lM7^3(&  
P(2OTfGGx  
void CCaptureDlg::DeleteIcon() rO.[/#p\  
{ );JWrkpz  
 NOTIFYICONDATA data;  <)~-]  
 data.cbSize=sizeof(NOTIFYICONDATA); t2OBVzK  
 data.hWnd=GetSafeHwnd(); dR< d7  
 data.uID=98; 9kF0H a}J  
 Shell_NotifyIcon(NIM_DELETE,&data); .zt&HI.F  
 ShowWindow(SW_SHOW); ]1>R8  
 SetForegroundWindow(); k+?gWZ \  
 ShowWindow(SW_SHOWNORMAL); U*\K<fw   
 bTray=FALSE; XMkRYI1~  
} +^esL9RG:  
SJh~4R\  
void CCaptureDlg::OnChange() S2E z}*plp  
{ v{ohrpb0v  
 RegisterHotkey(); ~&RrlFh  
} G rU`;M"  
U?{oxy_[2  
BOOL CCaptureDlg::RegisterHotkey() Ly^bP>2i  
{ /ILd|j(e  
 UpdateData(); cUG^^3!  
 UCHAR mask=0; 46e?%0(  
 UCHAR key=0; )fIG4#%\  
 if(m_bControl) N*$GP3]  
  mask|=4; Keo<#Cc?  
 if(m_bAlt) Nj2l>[L;  
  mask|=2; o_mjI:  
 if(m_bShift) f sh9-iY8e  
  mask|=1; FNF`Z  
  key=Key_Table[m_Key.GetCurSel()]; CR9wp] -Vd  
 if(bRegistered){ *'A*!=5(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1|xe'w{  
  bRegistered=FALSE; 3~3tjhw;]9  
 } )~R[aXkvY  
 cMask=mask; c"lwFr9x7  
 cKey=key; EwV$2AK  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $6*Yh-"g  
 return bRegistered; 2P8wvNDG  
} &uO-h  
fw,,cu`YA  
  四、小结 2 G*uv+=  
4D<C;>*/b  
  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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