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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: =TA8]7S~U  
  Fh}GJE   
  一、实现方法  CxrsP.  
 )eH?3""  
  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: #`%V/#YK  
JHJ]BMm  
#pragma data_seg("shareddata") 3.h0  
HHOOK hHook =NULL; //钩子句柄 m~gcc  
UINT nHookCount =0; //挂接的程序数目 X#ud_+6x  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 B_"PFWwg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 |J~A )Bw?  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +)_#j/  
static int KeyCount =0; jPs{Mr<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6h1pPx7zU  
#pragma data_seg() K}p0$Lc  
EfX,0NqT  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 cEK#5   
P9M%B2DQ6f  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: *,,:;F^  
hcR^?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5m?9O7Pg  
cKey,UCHAR cMask) Q5*"t*L!N  
{ -`1)yhS  
 BOOL bAdded=FALSE; -2Dgr\M  
 for(int index=0;index<MAX_KEY;index++){ N({-&A.N  
  if(hCallWnd[index]==0){ _RWH$L9  
   hCallWnd[index]=hWnd; M`?ATmYy  
   HotKey[index]=cKey; )!'7!" $  
   HotKeyMask[index]=cMask; yp< )v(8|'  
   bAdded=TRUE; dlwOmO'Bm)  
   KeyCount++; :DFtH13qO  
   break; SOluTFxUw  
  } vtRz;~,Z  
 } zT'(I6 S:)  
 return bAdded; Q 34-a"6)  
} ;33SUgX  
//删除热键 J>fq5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) CT (HTu  
{ Wli!s~c5Fo  
 BOOL bRemoved=FALSE; m(CsO|pz  
 for(int index=0;index<MAX_KEY;index++){ (w Q,($@  
  if(hCallWnd[index]==hWnd){ p@wtT"Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _!%@V=  
    hCallWnd[index]=NULL; VgS2_TU  
    HotKey[index]=0; xiF}{25a  
    HotKeyMask[index]=0; v3cLU7bi?2  
    bRemoved=TRUE; /Y [ b8f  
    KeyCount--; $I9U.~*  
    break; nQG<OVRClS  
   } ;V bB]aUg  
  } }*7Gq  
 } 3w+ +F@(  
 return bRemoved; 4\ny]A:~  
} ?_. SV g  
Pxgal4{6  
r|ogF8YN  
  DLL中的钩子函数如下: x)f<lZ^L&H  
'~xiD?:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Sy^@v%P'A  
{ Or-LQ^~  
 BOOL bProcessed=FALSE; a,e;(/#\7  
 if(HC_ACTION==nCode) U:8cz=#  
 { "|/q4JN)7d  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /1.gv~`+  
   switch(wParam) Kj:'Ei7  
   {  NFI~vkk'G  
    case VK_MENU: 7Kt i&T  
     MaskBits&=~ALTBIT; a)!R4  
     break; *]ME]2qP  
    case VK_CONTROL: !ozHS_  
     MaskBits&=~CTRLBIT; 9 $zx<O  
     break; Jjh=zxR>  
    case VK_SHIFT: VgMuX3=  
     MaskBits&=~SHIFTBIT; 0kaMYV?  
     break; Kp6%=JjO  
    default: //judge the key and send message 3Q_)Xs r`  
     break; )b,FE}YX  
   } hO(A_Bw  
   for(int index=0;index<MAX_KEY;index++){ ZC)m&V 1  
    if(hCallWnd[index]==NULL) `-5gsJ  
     continue; 35YDP|XZb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @ZtvpL}e  
    { TrBtTqH)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); X&!($*/  
     bProcessed=TRUE; DOq"=R+  
    } DK#Tr: 7  
   } QV _a M2  
  } LqS_%6^  
  else if((lParam&0xc000ffff)==1){ //有键按下 z/i&Lpr:  
   switch(wParam) }L>0}H  
   { Q1x=@lXR  
    case VK_MENU: wLo<gA6;  
     MaskBits|=ALTBIT; IC-W[~  
     break; BuS[(  
    case VK_CONTROL: kM3#[#6$!  
     MaskBits|=CTRLBIT; Jv~^hN2  
     break; s_U--y.2r(  
    case VK_SHIFT: ]F"@+_E  
     MaskBits|=SHIFTBIT; {Vf].l:kn  
     break; 2D"aAI<P  
    default: //judge the key and send message 8>(/:u_x  
     break; A9LVS&52  
   } mh#_lbe'  
   for(int index=0;index<MAX_KEY;index++){ H~W=#Cx  
    if(hCallWnd[index]==NULL) nsu RG  
     continue; l)Mi?B~N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Oo9'  
    { C%"aj^u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *Q;?p hr  
     bProcessed=TRUE; Y\E7nll:.  
    } ~FnY'F<35  
   } `Yyi;!+0  
  }  `dIwBfg_  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 aO* v"^oF  
   for(int index=0;index<MAX_KEY;index++){ KuMH,rXF  
    if(hCallWnd[index]==NULL) H1$n6J  
     continue; l <yYfGO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Oki{)Ssy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "fu@2y4^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *4c5b'u  
   } I~,bZA  
  } _BG7 JvI  
 } _[N*k"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Y$W)JWMY`  
} [!`5kI  
Zl?9ibm;@  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: , jCE hb  
kk}_AZ0eK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l_P90zm39!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U"L-1]L  
BxB B](  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: lDZ~  
l _zTpyOZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Cw~fP[5XMF  
{ >txeo17Ba\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 5e&;f  
 { %.;;itB  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^t,haO4  
  SaveBmp(); ]aYuBoj  
  return FALSE; 2h1P!4W85  
 } YAd%d|Q  
 …… //其它处理及默认处理 }bnodb^.7  
} 4TSkm`iR  
8I0G%hD  
DDZnNSo<JQ  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 1tlqw  
vZXdc+2l  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 @ 6H7  
UtHloq(r  
  二、编程步骤 J@qLBe(v  
n_*.i1\'w  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; rGay~\  
 =sk#`,,:  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; =0SJf 3  
j2mMm/kq\  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; \og2\Oh&gH  
TwKi_nh2m  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; =tl~@~pqI  
r"dR}S.Uf  
  5、 添加代码,编译运行程序。 *TPWLR ^  
y8 dOx=c  
三、程序代码 wqgKs=y  
hbs /S  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~iq=J5IN#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) DkW^gt  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \+k~p:d_8  
#if _MSC_VER > 1000 [<nd+3E  
#pragma once )-25?B  
#endif // _MSC_VER > 1000 `tl-] ^Y2  
#ifndef __AFXWIN_H__ Bq tN=  
#error include 'stdafx.h' before including this file for PCH p:3w8#)MZ  
#endif wcGv#J],  
#include "resource.h" // main symbols <Ik5S1<h$H  
class CHookApp : public CWinApp #It!D5A  
{ lLI%J>b@  
 public: Jv!f6*&<  
  CHookApp(); gwFW+*h  
  // Overrides 6xu%M&ht  
  // ClassWizard generated virtual function overrides n D}<zj$D2  
  //{{AFX_VIRTUAL(CHookApp) !wKiMgLS  
 public: h7AO5"6  
  virtual BOOL InitInstance(); 18]Q4s8E  
  virtual int ExitInstance(); EB p g  
  //}}AFX_VIRTUAL HstL'{&,-m  
  //{{AFX_MSG(CHookApp) yGH')TsjD  
  // NOTE - the ClassWizard will add and remove member functions here. +P.JiH`\=  
  // DO NOT EDIT what you see in these blocks of generated code ! l`a_0  
  //}}AFX_MSG 38%"#T3#  
  DECLARE_MESSAGE_MAP() 7?\r9bD  
}; 9fsc>9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Z 4c^6v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); upFe{M@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3;R`_#t+  
BOOL InitHotkey(); %1)JRc  
BOOL UnInit(); zbfe=J4c  
#endif ~w(A3I.  
^MVOaV65  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. o5G]|JM_  
#include "stdafx.h" ^}lL@Bd|  
#include "hook.h" $SfY<j,R  
#include <windowsx.h> c*R18,5-  
#ifdef _DEBUG ?\zyeWK0L  
#define new DEBUG_NEW [~?6jnp  
#undef THIS_FILE bG+Gg*0p  
static char THIS_FILE[] = __FILE__; IEWl I  
#endif ,2P /[ :  
#define MAX_KEY 100 ^Zlbs goZ  
#define CTRLBIT 0x04 m; PTO$--  
#define ALTBIT 0x02 ^BP4l_rO9  
#define SHIFTBIT 0x01 1+Vei<H$  
#pragma data_seg("shareddata") n,{  
HHOOK hHook =NULL; ${`q!  
UINT nHookCount =0; &?k`rF9  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ){w!< Lb  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 2hTsjJ!'  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (A-Uo   
static int KeyCount =0; y|3!E>Up  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 'Z nJd j  
#pragma data_seg() etk|%%J  
HINSTANCE hins; oUB9)C~  
void VerifyWindow(); #*3 vE& p  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) p$<){,R  
//{{AFX_MSG_MAP(CHookApp) <)oxs ]<  
// NOTE - the ClassWizard will add and remove mapping macros here. 8DFq eY0S  
// DO NOT EDIT what you see in these blocks of generated code! /K_*Drk>  
//}}AFX_MSG_MAP 01IfvK  
END_MESSAGE_MAP() 4+4&}8FH  
(V"7H  
CHookApp::CHookApp() @9\E  
{ VYrs4IFT$  
 // TODO: add construction code here, A$?o3--#]G  
 // Place all significant initialization in InitInstance TBgiA}|\D  
} \3)U~[O>:  
<iM}p^jX9  
CHookApp theApp; T%**:@}+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \p)eY#A  
{ h{ eQ\iI  
 BOOL bProcessed=FALSE; 2-^ ['R  
 if(HC_ACTION==nCode) w7~&Xxa/  
 { _HkQv6fXpE  
  if((lParam&0xc0000000)==0xc0000000){// Key up .L ^F4  
   switch(wParam) Hq,znRz~`  
   { ;9qwB  
    case VK_MENU: qnO/4\qq  
     MaskBits&=~ALTBIT; 5'EoB^`8N~  
     break; #:Ukv?  
    case VK_CONTROL: {3 >`k.w  
     MaskBits&=~CTRLBIT; ,fj~BkW{  
     break; KC54=Rf  
    case VK_SHIFT: 3) XS^WG  
     MaskBits&=~SHIFTBIT; 0p'g+ 2  
     break; .GFKy  
    default: //judge the key and send message wL&[Vi_j{  
     break; :BblH0'  
   } 4n%|h-!8  
   for(int index=0;index<MAX_KEY;index++){ KCn#*[  
    if(hCallWnd[index]==NULL) ,_:6qn{  
     continue; VGOdJ|2]Wr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8,:lw3x1  
    { Gn<e&|4>i}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); pzU:AUW  
     bProcessed=TRUE; UBx0Z0Y  
    } zZS,<Z  
   } Q|Nw @7$`  
  } p(A[ah_  
  else if((lParam&0xc000ffff)==1){ //Key down _ sBFs.o  
   switch(wParam) "p&4Sn3T2?  
   { Dj w#{WR  
    case VK_MENU: 5=;'LWXCJ  
     MaskBits|=ALTBIT; 2F:X:f  
     break; ^k!u  
    case VK_CONTROL: Hlj3z3  
     MaskBits|=CTRLBIT; q&,uJo  
     break; ; $UB@)7%  
    case VK_SHIFT: oSP^ .BJ$  
     MaskBits|=SHIFTBIT; mm N $\2  
     break; ?#L5V'ZZ*  
    default: //judge the key and send message kqLpt  
     break; [O6JVXO>  
   } "mcuF]7F  
   for(int index=0;index<MAX_KEY;index++) _61tE  
   { [V;Q#r&+  
    if(hCallWnd[index]==NULL) ak(P<OC-  
     continue; ?<soX8_1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L(BL_  
    { >n>gX/S<C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6!RK Zj)  
     bProcessed=TRUE; 8 HdjZ!  
    } Na`vw  
   } q?# w%0}  
  } B|rf[EI>  
  if(!bProcessed){ 9RY}m7  
   for(int index=0;index<MAX_KEY;index++){ `_M&zN  
    if(hCallWnd[index]==NULL) xGX U7w:X  
     continue; u2l`% F`x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J(`(PYo\i  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); aMyf|l.  
   } ~-NlTx  
  } 5R O_)G<  
 } ]$A6krfh|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _\AT_Zmy  
} </qli-fXB}  
J8h H#7WMS  
BOOL InitHotkey() #:nds,   
{ !^w}Sp  
 if(hHook!=NULL){ }vQ Y+O  
  nHookCount++; /x&52~X5-  
  return TRUE; wdEQB-dA  
 } yzJTNLff  
 else 0+_:^z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); q7zHT=@$  
  if(hHook!=NULL) P L*kjrLu7  
   nHookCount++; vrXNa8,L  
  return (hHook!=NULL); ffh3okyW0  
} 2tdr1+U?g  
BOOL UnInit() ;5=5HYx%  
{ `wLMJ,@f.  
 if(nHookCount>1){ [1.>9ngj  
  nHookCount--; ](^BQc  
  return TRUE; iR4!X()  
 } FdmoR;  
 BOOL unhooked = UnhookWindowsHookEx(hHook); )>WSuf j  
 if(unhooked==TRUE){ K$~Ja  
  nHookCount=0; \@*D;-b  
  hHook=NULL; fngk<$lvg  
 } YXTd^M~@D  
 return unhooked; 3?yq*uE}  
}  .KE2sodq  
{i:Ayhq~&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EN~ha:9  
{ 1&JB@F9!  
 BOOL bAdded=FALSE; i>AKXJ+  
 for(int index=0;index<MAX_KEY;index++){ #jX%nqMxW  
  if(hCallWnd[index]==0){ r`d.Wy Zj  
   hCallWnd[index]=hWnd; +FtL_7[v  
   HotKey[index]=cKey; Xq.G vZS`  
   HotKeyMask[index]=cMask; Z$ Mc{  
   bAdded=TRUE; Tg#%5~IX  
   KeyCount++; 9rQw~B<S  
   break; ^+Stvj:N  
  } t+ O7dZt%r  
 } sqk$q pV6  
 return bAdded; ,2^zX]dgM  
} (ysDs[? \  
|[ ,|S{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jxA*Gg3cT5  
{ c^BeT;  
 BOOL bRemoved=FALSE; X5Ff2@."y|  
 for(int index=0;index<MAX_KEY;index++){ ^[-3qi  
  if(hCallWnd[index]==hWnd){ \d"M&-O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <!.Qn Y  
    hCallWnd[index]=NULL;  tvvRHvL  
    HotKey[index]=0; t[?O*>  
    HotKeyMask[index]=0; 9N{"ob Z  
    bRemoved=TRUE; *6 1G<I  
    KeyCount--; }TAHVcX*p  
    break; naWW i]9  
   } zrCQEQq  
  } gAViwy9{  
 } zu|=1C#5h  
 return bRemoved; %^66(n)  
} WG.J-2#3  
{,b:f  
void VerifyWindow() ;l2pdP4jf  
{ pbb6?R,  
 for(int i=0;i<MAX_KEY;i++){ 'Gds?o8  
  if(hCallWnd!=NULL){ L# NW<T  
   if(!IsWindow(hCallWnd)){ fW.)!EPO  
    hCallWnd=NULL; rJ}k!}G  
    HotKey=0; i2+vUl|;Z  
    HotKeyMask=0; >6zXr.  
    KeyCount--; a76`"(W  
   } V61.UEN  
  } zWEt< `1M  
 } 4GTB82V$  
} gay6dj^  
>\c"U1%E  
BOOL CHookApp::InitInstance() 2zN%Z!a#J  
{ ?.b.mkJ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); l:rT{l=8*  
 hins=AfxGetInstanceHandle(); a#:K"Mf.  
 InitHotkey(); ^zVBS7`J  
 return CWinApp::InitInstance(); ISl-W1u}  
} 7BDoF!kCx  
*/yR _f  
int CHookApp::ExitInstance() 4w-P%-4  
{ 9Wi+7_)  
 VerifyWindow(); jFMf=u&U  
 UnInit(); G Za<  
 return CWinApp::ExitInstance(); Y>: e4Q  
} p[M*<==4  
F),wj8#~>-  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 5W=jQ3 C  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &fYV FRVkq  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .kkrU  
#if _MSC_VER > 1000 KQ(7%W  
#pragma once 1P+Te,I  
#endif // _MSC_VER > 1000 i VIpe  
b#[7A  
class CCaptureDlg : public CDialog IHlTp0?  
{ lwuslt*E/  
 // Construction \a}W{e=FNT  
 public: 51lN,VVD  
  BOOL bTray; P1f@?R&t+  
  BOOL bRegistered; H%AC *,  
  BOOL RegisterHotkey(); >k{KwFB^S  
  UCHAR cKey; j? P=}_Ru  
  UCHAR cMask; (77EZ07%  
  void DeleteIcon(); G`" 9/FI7  
  void AddIcon(); T=n)ea A  
  UINT nCount; #+,O  
  void SaveBmp(); m=uW:~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor rF8n z:8  
  // Dialog Data O A9G] 8k  
  //{{AFX_DATA(CCaptureDlg) *(sUz?t  
  enum { IDD = IDD_CAPTURE_DIALOG }; }yW*vy6`  
  CComboBox m_Key; =`MU*Arcs[  
  BOOL m_bControl; v{dvB:KP5X  
  BOOL m_bAlt; pl.K*9+  
  BOOL m_bShift; rWo&I _{  
  CString m_Path; J(JqusQd !  
  CString m_Number; ;jgJI~3l  
  //}}AFX_DATA =(Ll}V,  
  // ClassWizard generated virtual function overrides -h/KrB  
  //{{AFX_VIRTUAL(CCaptureDlg) >^fkHbgNQ  
 public: eQvdi|6  
  virtual BOOL PreTranslateMessage(MSG* pMsg); S=bdue  
 protected: ^Gs=U[**  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %[9d1F 3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~HH6=qjU)  
  //}}AFX_VIRTUAL ;5fq[v^P:  
  // Implementation 4dwG6-  
 protected: K^'NG!  
  HICON m_hIcon; #I(Ho:b  
  // Generated message map functions (;o/2Q?  
  //{{AFX_MSG(CCaptureDlg) M)1? $'Aq  
  virtual BOOL OnInitDialog(); T8ftBIOi  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^5yFb=2  
  afx_msg void OnPaint(); lB Y"@N  
  afx_msg HCURSOR OnQueryDragIcon(); L~])?d  
  virtual void OnCancel(); 3\Ma)\>R\-  
  afx_msg void OnAbout(); [Q=NGHB1/  
  afx_msg void OnBrowse(); K!MIA  
  afx_msg void OnChange(); MSw:Ay [9  
 //}}AFX_MSG i$:\,  
 DECLARE_MESSAGE_MAP() f4TNy^-  
}; b\l +S2  
#endif `Ko6;s#  
rcWr0q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Jm l4EW7  
#include "stdafx.h" (\=iKE4#  
#include "Capture.h" OYsG#  
#include "CaptureDlg.h" v)a$;P%  
#include <windowsx.h> },G>+ s8h  
#pragma comment(lib,"hook.lib") 4x'N#m{p  
#ifdef _DEBUG >sL"HyY#H  
#define new DEBUG_NEW #6%9*Rh  
#undef THIS_FILE DfNX@gbo  
static char THIS_FILE[] = __FILE__; LmKG6>Q1#1  
#endif !h "6h  
#define IDM_SHELL WM_USER+1 rz @;Zn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dfmxz7V  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -8]M ,,?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 85Hb~|0  
class CAboutDlg : public CDialog \!["U`\.K  
{ LS=HX~5C  
 public: P ;#}@/E  
  CAboutDlg(); Uu9*nH_  
  // Dialog Data &u_s*  
  //{{AFX_DATA(CAboutDlg) `2M`;$~ 5  
  enum { IDD = IDD_ABOUTBOX }; +Xg]@IS-eg  
  //}}AFX_DATA h* to%N  
  // ClassWizard generated virtual function overrides T!T6M6?  
  //{{AFX_VIRTUAL(CAboutDlg) 6] ~g*]T  
 protected: Q'ok%9q!p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xgi/,Nk '  
  //}}AFX_VIRTUAL fA]b'8  
  // Implementation )aOPR|+  
 protected: $1h,<$5H  
  //{{AFX_MSG(CAboutDlg) -|l^- Qf!  
  //}}AFX_MSG -2dk8]KB]  
  DECLARE_MESSAGE_MAP() <3;Sq~^  
}; ) DzbJ}  
,c%>M^d  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7n1@m_7O  
{ )K4A-9pC  
 //{{AFX_DATA_INIT(CAboutDlg) HW)4#nLhh  
 //}}AFX_DATA_INIT )4hb%U  
} )@ /!B`  
i5>]$j1/  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) F|3 =Cl  
{ O+Zt*jN;  
 CDialog::DoDataExchange(pDX); 39w|2%(O.  
 //{{AFX_DATA_MAP(CAboutDlg) ]0VjVU-  
 //}}AFX_DATA_MAP ?~;8Y=O  
} i9NUv3#  
Wq+6`o  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) /GK1}h  
 //{{AFX_MSG_MAP(CAboutDlg) *)V1Sd#m  
 // No message handlers d8|bO#a%9  
 //}}AFX_MSG_MAP Hvn{aLa.  
END_MESSAGE_MAP() V0,%g+.^  
, 8NY<sFh  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) JO4rU- n  
: CDialog(CCaptureDlg::IDD, pParent) Pw^ lp'dO  
{ oCBZ9PGkK  
 //{{AFX_DATA_INIT(CCaptureDlg) }=':)?'-.  
  m_bControl = FALSE; ,<[Q/:}[  
  m_bAlt = FALSE; !18M!8Xea  
  m_bShift = FALSE; [f'V pId8  
  m_Path = _T("c:\\"); :<    
  m_Number = _T("0 picture captured."); ;'.[h*u~<  
  nCount=0; 3J2j5N:g  
  bRegistered=FALSE; j0p'_|)(  
  bTray=FALSE; 6iiH+Nc  
 //}}AFX_DATA_INIT -/>SdR$D7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 88)F-St  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); io[$QTY  
} iUv#oX H  
rKR2v (c  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !+;'kI2  
{ X\r?g  
 CDialog::DoDataExchange(pDX); Q0)6 2[cMm  
 //{{AFX_DATA_MAP(CCaptureDlg) kvzGI>H:  
  DDX_Control(pDX, IDC_KEY, m_Key); E1U~ ew  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?h;Zdv>`xz  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ~bp^Q| wM  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); jpl"KN?X  
  DDX_Text(pDX, IDC_PATH, m_Path); H1]An'qz,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); q;dg,Om  
 //}}AFX_DATA_MAP Pd99vq/  
} w&eX)!  
vjy59m  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) yw|O,V<4N  
//{{AFX_MSG_MAP(CCaptureDlg) 3x=f}SO&  
 ON_WM_SYSCOMMAND() <+1d'VQ2  
 ON_WM_PAINT() hrpql_9.  
 ON_WM_QUERYDRAGICON() #S57SD  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) =Fq"lq %  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "t4$%7L]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) k^ CFu  
//}}AFX_MSG_MAP _;] 3w  
END_MESSAGE_MAP() X~DI d  
NuLyu=.?  
BOOL CCaptureDlg::OnInitDialog() &{): x  
{ nu1s  
 CDialog::OnInitDialog(); 9o|=n'o  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9sQ4 $  
 ASSERT(IDM_ABOUTBOX < 0xF000); kKU,|> 3h  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \ /3Xb  
 if (pSysMenu != NULL) VP|ga }(  
 { EkV LSur  
  CString strAboutMenu;  #K8kz  
  strAboutMenu.LoadString(IDS_ABOUTBOX); jG"n);WF  
  if (!strAboutMenu.IsEmpty()) Bn83W4M  
  { TA=VfA B  
   pSysMenu->AppendMenu(MF_SEPARATOR); ;VY0DAp{  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); n%o"n?e  
  } eIEr\X4\~~  
 } F;Q8^C0e*c  
 SetIcon(m_hIcon, TRUE); // Set big icon 9?xMsu-H  
 SetIcon(m_hIcon, FALSE); // Set small icon DYJ F6O  
 m_Key.SetCurSel(0); -r%3"C=m  
 RegisterHotkey(); +I$ k_  
 CMenu* pMenu=GetSystemMenu(FALSE); xFU*,Y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); H"_ZqEg  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :zXkQQD8`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); v(+9&  
 return TRUE; // return TRUE unless you set the focus to a control 1l$c*STK  
} ;++CMTza]  
5&WYL  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ).[Mnt/Ft  
{ ~J}{'l1{yf  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) eyq8wQT  
 { Q`nsL)J  
  CAboutDlg dlgAbout; =2[5 g!qX  
  dlgAbout.DoModal(); '.jr" 3u  
 } C NDf&dzX8  
 else [89qg+z  
 { K3QE>@']  
  CDialog::OnSysCommand(nID, lParam); 0Q^a*7w`8a  
 } x7qVLpcL3z  
} Nf.6:=  
'l+).},  
void CCaptureDlg::OnPaint() W\V'o Vt  
{ xE$(I<:  
 if (IsIconic()) cO9aT  
 { O?<R.W<QI  
  CPaintDC dc(this); // device context for painting oxN~(H)/ #  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); xh$1Rwa  
  // Center icon in client rectangle "PM!03rb  
  int cxIcon = GetSystemMetrics(SM_CXICON); !;";L5()  
  int cyIcon = GetSystemMetrics(SM_CYICON); ;9>(yJI+  
  CRect rect; biTET|U`$  
  GetClientRect(&rect); BU-m\Kf)  
  int x = (rect.Width() - cxIcon + 1) / 2; ^oNk}:>  
  int y = (rect.Height() - cyIcon + 1) / 2; 0/7y&-/(  
  // Draw the icon 6%/@b`vZ  
  dc.DrawIcon(x, y, m_hIcon); OR4ZjogzY  
 } Q{hXP*5  
 else 1bW[RK;GE  
 { =|)W#x9=  
  CDialog::OnPaint(); 2&st/y(hs  
 } %#!pAUP\&  
} F9DY\EI  
 >'>onAIL  
HCURSOR CCaptureDlg::OnQueryDragIcon() 8cqH0{  
{ 3l?D%E]P  
 return (HCURSOR) m_hIcon; 7Sc._G{[%  
} Lq#>N_72W0  
g<,kV(_7  
void CCaptureDlg::OnCancel() [yzDa:%  
{ T~shJ0%  
 if(bTray) JZQT}  
  DeleteIcon(); Gw3H1:yo  
  CDialog::OnCancel(); ]JQ';%dne  
} 2hOr#I$/  
yH\z+A|  
void CCaptureDlg::OnAbout() (DzV3/+p^  
{ iOCx7j{BS  
 CAboutDlg dlg; *82f {t]  
 dlg.DoModal(); Ep/kb-~-  
} [nQ<pTg~r  
N1dp%b9W(  
void CCaptureDlg::OnBrowse() 9cJzL"yi  
{ y'ZRoakz)  
 CString str; u="VJ3  
 BROWSEINFO bi; vWbf5?  
 char name[MAX_PATH]; ^a=,,6T  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ^rz8c+ly  
 bi.hwndOwner=GetSafeHwnd(); A"wor\(  
 bi.pszDisplayName=name; #b[B$  
 bi.lpszTitle="Select folder"; d,r%LjNI  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {-28%  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); P'^#I[G'  
 if(idl==NULL) &"^,Ubfcn"  
  return; !{@!:m3w  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d|UK=B^x  
 str.ReleaseBuffer(); Za+26#g  
 m_Path=str; -"u9s[L{  
 if(str.GetAt(str.GetLength()-1)!='\\') ;Drt4fOxX  
  m_Path+="\\"; -p|@Enn  
 UpdateData(FALSE); .Rq|F  
} Jf<+VJ>t  
(A.%q1h  
void CCaptureDlg::SaveBmp() }"?v=9.G  
{ F-MN%WD~  
 CDC dc; q$[x*!~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Rk#@{_  
 CBitmap bm; F1skI _!  
 int Width=GetSystemMetrics(SM_CXSCREEN); &5Ai&<q"p  
 int Height=GetSystemMetrics(SM_CYSCREEN); /IDfGAE  
 bm.CreateCompatibleBitmap(&dc,Width,Height); XWQp-H.  
 CDC tdc; Z4U8~i  
 tdc.CreateCompatibleDC(&dc); >L6V!  
 CBitmap*pOld=tdc.SelectObject(&bm); #q`-"2"|  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 1:I47/  
 tdc.SelectObject(pOld); Z-(Vfp4  
 BITMAP btm; l`s_Id#  
 bm.GetBitmap(&btm); 9Ra_[1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; y99 3uP   
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); L_Q1:nL-0  
 BITMAPINFOHEADER bih; 'Wv=mBEfZ  
 bih.biBitCount=btm.bmBitsPixel; =Z ^=  
 bih.biClrImportant=0; QO;W}c:N  
 bih.biClrUsed=0; V\nQHzjF<6  
 bih.biCompression=0; -3 }  
 bih.biHeight=btm.bmHeight; +we3BE.  
 bih.biPlanes=1; p9*#{~   
 bih.biSize=sizeof(BITMAPINFOHEADER); jPG&Ypm1   
 bih.biSizeImage=size; Q_<CG[,6D1  
 bih.biWidth=btm.bmWidth; p s:|YR  
 bih.biXPelsPerMeter=0; U0}]3a0  
 bih.biYPelsPerMeter=0; 4%#C _pE9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :cv_G;?  
 static int filecount=0; C^]y iR-U  
 CString name; 5;=,BWU  
 name.Format("pict%04d.bmp",filecount++); a =LjFpv/]  
 name=m_Path+name; rYI9?q  
 BITMAPFILEHEADER bfh; ^:Vwblv(  
 bfh.bfReserved1=bfh.bfReserved2=0; tWkD@w`Lnn  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $E;`Y|r%WK  
 bfh.bfSize=54+size; qV57P6<  
 bfh.bfOffBits=54; ;IX3w:Aw  
 CFile bf; SWujj,-[  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ q.L0rY!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #S+GI!  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); cE S3<`[K  
  bf.WriteHuge(lpData,size); " $5J7  
  bf.Close(); 0m?v@K' l  
  nCount++; Vw7NLTE}`  
 } nKn,i$sO/.  
 GlobalFreePtr(lpData); =k]RzeI  
 if(nCount==1) <5*cc8  
  m_Number.Format("%d picture captured.",nCount); eup#.#J  
 else ]kC/b^~+m  
  m_Number.Format("%d pictures captured.",nCount); ^hOnLy2  
  UpdateData(FALSE); j'lfH6_')e  
} v%t "N  
D0(QZrVa  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) q|)8VmVV  
{ kJP fL s  
 if(pMsg -> message == WM_KEYDOWN) ]Y!$HT7\  
 { lxTW1kr  
  if(pMsg -> wParam == VK_ESCAPE) X5kIM\  
   return TRUE; ;5tSXgGw7  
  if(pMsg -> wParam == VK_RETURN) D@T>z;  
   return TRUE; AtNu:U$  
 } J[fjl 6p  
 return CDialog::PreTranslateMessage(pMsg); Q8.SD p  
} CA[-\>J7y  
BwO^F^Pr?k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l_JPkM(mJw  
{ pNFL;k+p}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ h@$M.h@mcG  
  SaveBmp(); 4}sfJ0HhX  
  return FALSE; y~_wr}.CS  
} 2T!pFcc  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <_&H<]t%rI  
 CMenu pop; Y>z~0$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Y4,~s64e  
 CMenu*pMenu=pop.GetSubMenu(0); il=y m  
 pMenu->SetDefaultItem(ID_EXITICON); F0 WM&{v  
 CPoint pt; |]`\ak  
 GetCursorPos(&pt); oGpyuB@A/  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); wJA`e)>  
 if(id==ID_EXITICON) DZGM4|@<7Y  
  DeleteIcon(); -E1b5i;f  
 else if(id==ID_EXIT) O)|{B>2r  
  OnCancel(); mXnl-_  
 return FALSE; +rS}f N$L.  
} lb3:#?  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); L{xCsJ3d  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }9[E+8L1  
 AddIcon(); @K`2y'#b  
 return res; GD?4/HkF  
} 9(k5Irv"'h  
]8*#%^  
void CCaptureDlg::AddIcon() L2Ynv4llm  
{ L~fx VdUz  
 NOTIFYICONDATA data; w[Ee#Yaj.-  
 data.cbSize=sizeof(NOTIFYICONDATA); zrYhx!@  
 CString tip; 7c|8>zES:E  
 tip.LoadString(IDS_ICONTIP); gV]]?X&  
 data.hIcon=GetIcon(0); 1t{h)fwi  
 data.hWnd=GetSafeHwnd(); e_6VPVa  
 strcpy(data.szTip,tip); t-gg,ttnA  
 data.uCallbackMessage=IDM_SHELL; p b:mw$XQ7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; YX38*Ml+V  
 data.uID=98; dXgj  
 Shell_NotifyIcon(NIM_ADD,&data); zk8 s?$  
 ShowWindow(SW_HIDE); 1euL+zeh  
 bTray=TRUE; gZ6]\l]J{  
} uev$5jlX  
o9-b!I2  
void CCaptureDlg::DeleteIcon() BE/#=$wPjM  
{ [r%WVf.#d  
 NOTIFYICONDATA data; qCg`"/0  
 data.cbSize=sizeof(NOTIFYICONDATA); 24Lo .  
 data.hWnd=GetSafeHwnd(); ] fz0E:x  
 data.uID=98; kxU <?0  
 Shell_NotifyIcon(NIM_DELETE,&data); ;pu68N(B  
 ShowWindow(SW_SHOW); rnWU[U8%  
 SetForegroundWindow(); "HTp1  
 ShowWindow(SW_SHOWNORMAL); `HXP*Bp#  
 bTray=FALSE; <H3njv  
} iLf:an*vH  
@D_=M tF<  
void CCaptureDlg::OnChange() C YA#:  
{ 4G;FpWQm  
 RegisterHotkey(); [|PVq#(  
} 7:x%^J+  
B,?Fjot#m  
BOOL CCaptureDlg::RegisterHotkey() uKF?UXc  
{ HlEp Dph%  
 UpdateData(); Eyu]0+  
 UCHAR mask=0; "TB4w2?=  
 UCHAR key=0; +-~hl  
 if(m_bControl) ],vUW#6$N  
  mask|=4; pE(\q+1<  
 if(m_bAlt) ^b=]=w  
  mask|=2; 9B &QY 2v  
 if(m_bShift) 0MDdcjqw  
  mask|=1; K r $R"  
  key=Key_Table[m_Key.GetCurSel()]; )%'Lm  
 if(bRegistered){ ~ qe9U 0  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); wW s<{ T  
  bRegistered=FALSE; Zp~2WJQ  
 } Z(LDAZG  
 cMask=mask; VP^Yph 8R  
 cKey=key; "4N%I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); .),%S}  
 return bRegistered; EIO!f[]o  
} Z}_{@|  
w5uOi}T\  
  四、小结 5m2(7FC%su  
WK5~"aw  
  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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