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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: }LUvh  
  F @PPhzZ  
  一、实现方法 V}E['fzBFV  
%BI8m|6  
  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: =M\yh,s!  
D;,p?]mgO~  
#pragma data_seg("shareddata") -X.#Y6(  
HHOOK hHook =NULL; //钩子句柄 y,D9O/VP  
UINT nHookCount =0; //挂接的程序数目 ,1]UOQ>AP  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 JX59n%$@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 529; _|  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey VUP|j/qD  
static int KeyCount =0; FnGKt\  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 49qa  
#pragma data_seg() TegdB|y7O  
t[|oSF#i  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 t^#1=nK  
^ D0"m>3r  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: yFE0a"0y  
RoqkT|#$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR uLdHE5vr  
cKey,UCHAR cMask) ZU\$x<,  
{ )]>t(  
 BOOL bAdded=FALSE; (Jq m9  
 for(int index=0;index<MAX_KEY;index++){ \mb4leg5  
  if(hCallWnd[index]==0){ rZUTBLZ`j  
   hCallWnd[index]=hWnd; rZI63S  
   HotKey[index]=cKey; d?oXz|;H(  
   HotKeyMask[index]=cMask; 1jC85^1Taq  
   bAdded=TRUE; _S_,rTf&  
   KeyCount++; H I9/  
   break; IOHWb&N6  
  } W{NWF[l8O?  
 } $WYt`U;*lj  
 return bAdded; Au2^ T1F  
} `xM*cJTZ  
//删除热键 -@AhJY.  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9SC1A-nF  
{ r\m{;Z#LJm  
 BOOL bRemoved=FALSE; /JNG}*  
 for(int index=0;index<MAX_KEY;index++){ 'iMzp]V;  
  if(hCallWnd[index]==hWnd){ N XB8u6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ eC/{c1C  
    hCallWnd[index]=NULL; /)K')  
    HotKey[index]=0; RFw0u 0Nrz  
    HotKeyMask[index]=0; 0A} X hX  
    bRemoved=TRUE; zlLZ8b+  
    KeyCount--; 60{G 4b)  
    break; 0\i\G|5  
   } \J:+Wl.9A  
  } GW {tZaB  
 } #19O5  
 return bRemoved; s(_z1  
} R&1>\t  
sm##owI  
!>(uhuTBF  
  DLL中的钩子函数如下: ,DEq"VW_  
X -1r$.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9@1n:X  
{ X au %v5r  
 BOOL bProcessed=FALSE; p;4FZ$  
 if(HC_ACTION==nCode) :%sG'_d  
 { 6$#,$aO  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 A8ViJ  
   switch(wParam) G5hRx@vfrL  
   {  3MX#}_7A  
    case VK_MENU: =U84*HAv  
     MaskBits&=~ALTBIT; uP4yJ/]  
     break; tnpEfi-  
    case VK_CONTROL: T6y~iNd<  
     MaskBits&=~CTRLBIT; f)vnm*&-  
     break; cvw17j  
    case VK_SHIFT: . LAB8bg  
     MaskBits&=~SHIFTBIT; )4fQ~)  
     break; ~_BjcY  
    default: //judge the key and send message e!Z}aOeE  
     break; "3_X$`v"!  
   } :V$\y up  
   for(int index=0;index<MAX_KEY;index++){  U :x;4  
    if(hCallWnd[index]==NULL) ]9_tto!/  
     continue; FVNTE +LW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j hRr!  
    { 'Rnzu0<lF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !4v>|tq!  
     bProcessed=TRUE; u ^#UsOt+  
    } = y^5PjN  
   } y?cN  
  } bOU"s>?  
  else if((lParam&0xc000ffff)==1){ //有键按下 IqlCl>_j  
   switch(wParam) Ay Uw  
   { @?s>oSyV  
    case VK_MENU: OL_#Uu  
     MaskBits|=ALTBIT; r4cz?e |  
     break; 6RIbsy  
    case VK_CONTROL: d@^%fVhG  
     MaskBits|=CTRLBIT; =84EX<B  
     break; NxA4*_|H9  
    case VK_SHIFT: f>xi (0  
     MaskBits|=SHIFTBIT; ;k0Jl0[}  
     break; {a\! 1~  
    default: //judge the key and send message S/*\j7cj  
     break; NsS;d^%I  
   } Fa`%MR1  
   for(int index=0;index<MAX_KEY;index++){ Z[&FIG% tV  
    if(hCallWnd[index]==NULL) vx7=I\1  
     continue; c ?<)!9:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a Z)1SX`D  
    { s[eSPSFZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); va QsG6q[  
     bProcessed=TRUE; A|K=>7n]U  
    } }; 7I   
   } "] 2^O  
  } 3H<%\SYp  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [So1`IA6  
   for(int index=0;index<MAX_KEY;index++){ C}uzzG6s  
    if(hCallWnd[index]==NULL) _'G'>X>}WU  
     continue;  96;5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) UsA fZg8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6d5J*y2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 H;<>uE Lie  
   } PepR ]ym  
  } &:ZR% f  
 } SHSfe{n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S W6oaa81  
} aso8,mpZuA  
|RD )pvVM  
  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: ?vbAaRg50s  
x'?p?u~[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4 7mT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Odw'Ua  
tBJ4lb  
  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: $8(QBZq  
?zC{T*a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) x8C\&ivn  
{ nC[aEZ7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) (x\VGo  
 { !U}2YM J  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6&;GC<].(y  
  SaveBmp(); ?+yM3As9_V  
  return FALSE; "l-#v| 54  
 } #^]vhnbN  
 …… //其它处理及默认处理 x'\C'zeF  
} j[R.UB3J  
&uc`w{,Zs  
g5pFr=NV  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Nr]Fh  
: qK-Rku  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 djnES,^%9  
#C.  
  二、编程步骤 .hG*mXw>  
}ssja,;  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ?aWVfX!+G5  
}.'rhR+  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Ye$j43b  
0fvOA*UP  
  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; <)!,$]S  
OE0G*`m  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Wq+GlB*  
? _bFe![q  
  5、 添加代码,编译运行程序。 Dj c-f  
Z|x|8 !D  
三、程序代码 LWTPNp:"{w  
}Md;=_TP  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL = &pLlG  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #O;JV}y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (57!{[J  
#if _MSC_VER > 1000 ?$)5NQB%  
#pragma once pw4^E|X  
#endif // _MSC_VER > 1000 =+wd"Bu  
#ifndef __AFXWIN_H__ 1d FuoX  
#error include 'stdafx.h' before including this file for PCH  6(-s@{  
#endif 7M7Ir\d0lp  
#include "resource.h" // main symbols `vOL3`P  
class CHookApp : public CWinApp &*7KQd  
{ [yk-<}#B  
 public: /u.ZvY3,  
  CHookApp(); *n EkbI/  
  // Overrides _ pz}  
  // ClassWizard generated virtual function overrides J+E,UiZU  
  //{{AFX_VIRTUAL(CHookApp) ,I5SAd|dX  
 public: Mhti  
  virtual BOOL InitInstance(); =(7nl#o  
  virtual int ExitInstance(); 2 HQ3G~U  
  //}}AFX_VIRTUAL EI 35&7(  
  //{{AFX_MSG(CHookApp) D%yY&q;  
  // NOTE - the ClassWizard will add and remove member functions here. D 6 y,Q  
  // DO NOT EDIT what you see in these blocks of generated code ! cXqYO|3/M  
  //}}AFX_MSG oS..y($TI  
  DECLARE_MESSAGE_MAP() JL1A3G  
}; 8vR_WHsL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); L0!CHP/nRS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =gQ9>An  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A)C)5W  
BOOL InitHotkey(); 9K`_P] l2z  
BOOL UnInit(); ;50&s .gZ  
#endif `2@.%s1o=  
ySmbX  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. oXnaL)Rk  
#include "stdafx.h" rjK`t_(=  
#include "hook.h" 6ABK)m-y  
#include <windowsx.h> _#:/ ~Jp  
#ifdef _DEBUG {JP q. A  
#define new DEBUG_NEW ,.W7Z~z  
#undef THIS_FILE P Y^#hC5:  
static char THIS_FILE[] = __FILE__; gk%@& TB/  
#endif Mq Ai}z%  
#define MAX_KEY 100 b[<RcM{r}  
#define CTRLBIT 0x04 H TOr  
#define ALTBIT 0x02 )|lxzlk  
#define SHIFTBIT 0x01 /qX?ca1_4^  
#pragma data_seg("shareddata") zd=O;T;.  
HHOOK hHook =NULL; ?F AI@4  
UINT nHookCount =0; O9sEaVX  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 9VnBNuT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT s;Gd`-S>d  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9aJIq{`E  
static int KeyCount =0; ",$_\l  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift pZ.b X  
#pragma data_seg() ;2<5^hgk  
HINSTANCE hins;  m[B#k$  
void VerifyWindow(); hWT jN  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) h)HEexyRg  
//{{AFX_MSG_MAP(CHookApp) Cf2WBX$  
// NOTE - the ClassWizard will add and remove mapping macros here. kUf i  
// DO NOT EDIT what you see in these blocks of generated code! =:^aBN#  
//}}AFX_MSG_MAP eluN~T:W  
END_MESSAGE_MAP() __g k:a>oQ  
5G f@n/M"  
CHookApp::CHookApp() }4A] x`3  
{ q<dG}aj  
 // TODO: add construction code here, 7 $e6H|j@  
 // Place all significant initialization in InitInstance T- en|.  
} Y_JQPup  
&J>e; X  
CHookApp theApp; W,<q!<z\t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) SO$Af!S:bB  
{ ?*fY$93O  
 BOOL bProcessed=FALSE; .:$(o&  
 if(HC_ACTION==nCode) p{g4`o  
 { zt(lV  
  if((lParam&0xc0000000)==0xc0000000){// Key up f+h\RE=BGt  
   switch(wParam) $4nAb^/  
   { Q/+`9z+c  
    case VK_MENU: X4 Arn,  
     MaskBits&=~ALTBIT; QqA=QTZ}  
     break; ~3F'X  
    case VK_CONTROL: h'y%TOob  
     MaskBits&=~CTRLBIT; {zwH3)|Hn  
     break; y{%0[x*N<m  
    case VK_SHIFT: zjpZ] $  
     MaskBits&=~SHIFTBIT; v675C#l(  
     break; !T{+s T  
    default: //judge the key and send message PI9,*rOy  
     break; +%JBr+1#\  
   } ZL( j5E  
   for(int index=0;index<MAX_KEY;index++){  LR97FG  
    if(hCallWnd[index]==NULL) 0k]ApW  
     continue; 0:$ }~T9T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M@Th^yF+8H  
    { x-BU$bx5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ABWn49c.  
     bProcessed=TRUE; mUBy*.  
    } R}nvSerVb  
   } *uc/| c  
  } 5,"c1[`-  
  else if((lParam&0xc000ffff)==1){ //Key down e\%,\ uV}  
   switch(wParam) dli(ckr  
   { e^y9Kmd  
    case VK_MENU: 7v5]% %E/  
     MaskBits|=ALTBIT; 2u3Kyn  
     break; d^C@5Pd <  
    case VK_CONTROL: =zkN63S  
     MaskBits|=CTRLBIT; |Y7SP]/`gB  
     break; 3\7MeG`tl  
    case VK_SHIFT: TeHJj`rdAU  
     MaskBits|=SHIFTBIT; EXDDUqZ5\  
     break; 1d5%(:@  
    default: //judge the key and send message 2"IV  
     break; EF0v!XW  
   } nLN0zfhE#  
   for(int index=0;index<MAX_KEY;index++) >mb}~wx`  
   { 3~>-A=  
    if(hCallWnd[index]==NULL) TM)INo^  
     continue; b>ai"!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gRLt0&Q~  
    { I,-n[k\J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .5|[gBK  
     bProcessed=TRUE; cl& w/OJ#  
    } 5YY5t^T  
   } =7 l uV_5  
  } Lq(=0U\"P  
  if(!bProcessed){ 1&w%TRC2x  
   for(int index=0;index<MAX_KEY;index++){ &Hoc`u  
    if(hCallWnd[index]==NULL) &*`dRIQ]  
     continue; |E8sw a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V(';2[)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ynI e4b  
   } wWl ?c  
  } S\GWMB!oF  
 } M':-f3aT%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |AYii-g  
} A8% e _XA  
4.O)/0sU  
BOOL InitHotkey() ~74Sq'j9Wt  
{ b}! cEJY  
 if(hHook!=NULL){ Kb;*"@LX  
  nHookCount++; 8eXe b|?J  
  return TRUE; %1?t)Bg  
 } ,6^<Vg  
 else j.=:S;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %\JGDM*m  
  if(hHook!=NULL) pDS[ecx  
   nHookCount++; L=lSW7R  
  return (hHook!=NULL); MJ}{Q1|*  
} <"3q5ic/Z  
BOOL UnInit() }&0LoW/  
{ KL$.E!d  
 if(nHookCount>1){ :8yebOs   
  nHookCount--; od `;XVG  
  return TRUE; R27'00(Z0  
 } nCYz ];".  
 BOOL unhooked = UnhookWindowsHookEx(hHook); e$9a9twl  
 if(unhooked==TRUE){ |4+'YgO  
  nHookCount=0; P zJ(Q  
  hHook=NULL; aO{@.  
 } ^G!cv  
 return unhooked; :<g0Ho?e  
} \(Ma>E4PNU  
h8/tKyr8(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3@~a)E}T  
{ klKUX/ g  
 BOOL bAdded=FALSE; ^Gk)aX  
 for(int index=0;index<MAX_KEY;index++){ , Q0Y} )  
  if(hCallWnd[index]==0){ DuC#tDP  
   hCallWnd[index]=hWnd; LATizu  
   HotKey[index]=cKey; [{Wo:c9Qq1  
   HotKeyMask[index]=cMask; Bz'.7" ":0  
   bAdded=TRUE; N8 2 6xvA  
   KeyCount++; 5( <O?#P  
   break; L&6^(Bn   
  } =-^A;AO(  
 } DN%}OcpZ  
 return bAdded; vjX,7NY?  
} pCt2 -aam  
,$`} Rf<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `)cI^!  
{ / =9Y(v  
 BOOL bRemoved=FALSE; 1gK|n  
 for(int index=0;index<MAX_KEY;index++){ [W )%0lx  
  if(hCallWnd[index]==hWnd){ p@pb[Bx~[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 82FEl~,^E  
    hCallWnd[index]=NULL; |47t+[b   
    HotKey[index]=0; (rFkXK4^J  
    HotKeyMask[index]=0; [pU(z'caS  
    bRemoved=TRUE; O.jm{x!m  
    KeyCount--; X>$Wf3  
    break; =|J*9z;  
   } = cRmaD  
  } +mjwX?yF  
 } }"+"nf5h  
 return bRemoved; Tu-lc)  
} Xc[ym  
GyL9}  
void VerifyWindow() <Y6Vfee,&  
{ >V8!OaY5n  
 for(int i=0;i<MAX_KEY;i++){ tD`^qMua  
  if(hCallWnd!=NULL){  dF `7]  
   if(!IsWindow(hCallWnd)){ oL9<Fi  
    hCallWnd=NULL; i\lvxbp  
    HotKey=0; yLf9cS6=  
    HotKeyMask=0; XOX$uLm  
    KeyCount--; `XF[A8@h  
   } 2{RRaUoRb  
  } ,R=!ts[qi  
 } &'`C#-e@  
} uPl7u 1c  
a5Vlfx  
BOOL CHookApp::InitInstance() z~f;}`0  
{ Lea4-Gc  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1PxRj  
 hins=AfxGetInstanceHandle();  MMk9rBf  
 InitHotkey(); < e3] pM  
 return CWinApp::InitInstance(); mvH}G8  
} M#Z^8(  
,eTdQI;   
int CHookApp::ExitInstance() ,X|FyO(p  
{ lI46 f  
 VerifyWindow(); \>4>sCC  
 UnInit(); I!Dx)>E&  
 return CWinApp::ExitInstance(); ?#c "wA&  
} De 3;}]wC  
aNM*=y`  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xN$V(ZX4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) GR(m+%Vw!  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2.JrLBhN  
#if _MSC_VER > 1000 ug{sQyLN  
#pragma once RPMz&/k  
#endif // _MSC_VER > 1000  e+#Oj  
uFmpc7  
class CCaptureDlg : public CDialog >9XG+f66E  
{ 1xtS$^APcd  
 // Construction Dd0yQgCu  
 public: sAO/yG  
  BOOL bTray; !p ~.Y+  
  BOOL bRegistered; CBdr 1  
  BOOL RegisterHotkey(); rp @%0/[  
  UCHAR cKey; 9(X~  
  UCHAR cMask; S&=@Hj-  
  void DeleteIcon(); G,6`:l  
  void AddIcon(); (j:[<U  
  UINT nCount; UCmJQJc  
  void SaveBmp(); rx]Q,;"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 0n X5Vo  
  // Dialog Data oT:w GBW  
  //{{AFX_DATA(CCaptureDlg) f7 ew<c\  
  enum { IDD = IDD_CAPTURE_DIALOG }; L kafB2y  
  CComboBox m_Key; FME,W&_d  
  BOOL m_bControl; Ac*)z#H  
  BOOL m_bAlt; |VE.khq#  
  BOOL m_bShift; ^eoW+OxH  
  CString m_Path; &9Z@P[f  
  CString m_Number; ?=?*W7  
  //}}AFX_DATA bA6^R If?  
  // ClassWizard generated virtual function overrides 3 ?gfDJfE  
  //{{AFX_VIRTUAL(CCaptureDlg)  OvC@E]/+  
 public: ]We0 RD"+  
  virtual BOOL PreTranslateMessage(MSG* pMsg); g C8 deC8  
 protected: nJgN2Z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ),o=~,v:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4*n1Xu 7^x  
  //}}AFX_VIRTUAL :hB6-CZkqN  
  // Implementation vPZ0?r_5W  
 protected: hOqNZ66{  
  HICON m_hIcon; HA$7Q~{N-t  
  // Generated message map functions cy8r}wD  
  //{{AFX_MSG(CCaptureDlg) (t"|XSF  
  virtual BOOL OnInitDialog(); RT%{M1tkS  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !t)uRJ   
  afx_msg void OnPaint(); H11@ DQ6  
  afx_msg HCURSOR OnQueryDragIcon(); a*,V\l|6  
  virtual void OnCancel(); PJKxh%J  
  afx_msg void OnAbout(); EcR[b@YI  
  afx_msg void OnBrowse(); rJp9ut'FEz  
  afx_msg void OnChange(); >FFp"%%  
 //}}AFX_MSG |c$*Fa"A  
 DECLARE_MESSAGE_MAP() z`J-J*R>d  
}; tuo'Uk)  
#endif \u/=?b  
> JTf0/  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #Guwbg  
#include "stdafx.h" F9IPA%  
#include "Capture.h" nwDW<J{f|U  
#include "CaptureDlg.h" v9D[| 4  
#include <windowsx.h> t/]za4w/  
#pragma comment(lib,"hook.lib") X-"0Zc  
#ifdef _DEBUG 3\B~`=*q/  
#define new DEBUG_NEW qm=9!jqC;  
#undef THIS_FILE ,+5 !1>\  
static char THIS_FILE[] = __FILE__; (/P-9<"U  
#endif |z)7XK  
#define IDM_SHELL WM_USER+1 TU2MG VYy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h9%.tGx  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *; 6LX  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]V"B`ip[2  
class CAboutDlg : public CDialog 8L))@SA+uJ  
{ *u34~v16,  
 public: %)r1?H} #%  
  CAboutDlg(); @j r$4pM?  
  // Dialog Data _ =(v? 2:?  
  //{{AFX_DATA(CAboutDlg) ;Ac!"_N?7  
  enum { IDD = IDD_ABOUTBOX }; Fz$^CMw5K  
  //}}AFX_DATA fqm6Pd{:(  
  // ClassWizard generated virtual function overrides x1`Jlzrp,  
  //{{AFX_VIRTUAL(CAboutDlg) `b5pa`\4  
 protected: ; JHf0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZN`I4Ak  
  //}}AFX_VIRTUAL QJH~YV\%  
  // Implementation M`G#cEc  
 protected: lHgmljn5u  
  //{{AFX_MSG(CAboutDlg) o l+*Oe  
  //}}AFX_MSG )9rJ]D^B  
  DECLARE_MESSAGE_MAP() s9?H#^Y5u  
}; W'C~{}c=  
*i7|~q/u  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (Mt-2+"+  
{ Qb1hk*$=  
 //{{AFX_DATA_INIT(CAboutDlg) v}"DW?  
 //}}AFX_DATA_INIT $,7Yo nc  
} ^pvnUODW[  
@yn1#E,  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) v1s0kdR,>  
{ nA#dXckoc  
 CDialog::DoDataExchange(pDX); qmGLc~M0  
 //{{AFX_DATA_MAP(CAboutDlg) !JwR[X\f  
 //}}AFX_DATA_MAP bX&=*L+ h6  
} +@yTcz  
\w@ "`!%  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) glRHn?p  
 //{{AFX_MSG_MAP(CAboutDlg) J?bx<$C@  
 // No message handlers ywbdV-t/  
 //}}AFX_MSG_MAP Sa$-Yf  
END_MESSAGE_MAP() ;XGO@*V5T  
^/$bd4,z  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -Y/c]g  
: CDialog(CCaptureDlg::IDD, pParent) um1xSf1Xv  
{ ; Z{jol  
 //{{AFX_DATA_INIT(CCaptureDlg) b*"%E, ?  
  m_bControl = FALSE; Ouc$M2m0!  
  m_bAlt = FALSE; GUqBnRA8j  
  m_bShift = FALSE; 5'[b:YC  
  m_Path = _T("c:\\"); `"qSr%|  
  m_Number = _T("0 picture captured."); J0 x)NnWJ  
  nCount=0; 18gApRa  
  bRegistered=FALSE; GC^>oF  
  bTray=FALSE; 4Yya+[RY  
 //}}AFX_DATA_INIT xr1,D5  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ex}hk!  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); jZ>x5 W  
} JWvL  
4jdP3Q/  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Q}:#H z?U  
{ C{U"Nsu+1  
 CDialog::DoDataExchange(pDX); =^`?O* /;  
 //{{AFX_DATA_MAP(CCaptureDlg) Y4I;-&d's  
  DDX_Control(pDX, IDC_KEY, m_Key); |'N)HH>;  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 4S3uzy%  
  DDX_Check(pDX, IDC_ALT, m_bAlt); R>n=_C  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); w j<fi  
  DDX_Text(pDX, IDC_PATH, m_Path); Ud'/ 9:P  
  DDX_Text(pDX, IDC_NUMBER, m_Number); M)j.Uu  
 //}}AFX_DATA_MAP fu $<*Sa2  
} cMp#_\B  
Dt=@OZW  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) k?;B1D8-n  
//{{AFX_MSG_MAP(CCaptureDlg) 0;2"X [e  
 ON_WM_SYSCOMMAND() E]dmXH8A  
 ON_WM_PAINT() M#;"7Qg  
 ON_WM_QUERYDRAGICON() 5v,_ Hgh  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) o3=pxU*  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]YWz;Z  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 6g&Ev'  
//}}AFX_MSG_MAP fuF!3Q  
END_MESSAGE_MAP() db`L0JB  
xSy`VuSl  
BOOL CCaptureDlg::OnInitDialog() &ws^Dm]R  
{ ?Es(pwJB  
 CDialog::OnInitDialog(); 4Be'w`Q {  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); N|\Q:<!2_w  
 ASSERT(IDM_ABOUTBOX < 0xF000); G[$g-NU+  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]-"G:r  
 if (pSysMenu != NULL) x ?24oO  
 { P+bA>lJd  
  CString strAboutMenu; K$/&C:,Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); zy(NJ  
  if (!strAboutMenu.IsEmpty()) _=-B%m  
  { #.j}:  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9wbj}tN\z  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,9Si 3vn  
  } IRyZ0$r:e\  
 } W.CbNou  
 SetIcon(m_hIcon, TRUE); // Set big icon ApNS0  
 SetIcon(m_hIcon, FALSE); // Set small icon y ~n1S~5cI  
 m_Key.SetCurSel(0); 1V.oR`&2E  
 RegisterHotkey(); <NWq0 3:&  
 CMenu* pMenu=GetSystemMenu(FALSE); 2"6bz^>}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  D9h  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); oju,2kpH7#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); QtQbr*q@%  
 return TRUE; // return TRUE unless you set the focus to a control 7!Qu+R  
} C?j:+  
Kk`Lu S?  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) nO+R >8,Q  
{ ZeLed[J^xJ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _;M3=MTM9  
 { 8PR\a!"  
  CAboutDlg dlgAbout; lFl(Sww!\  
  dlgAbout.DoModal(); >#VNA^+t  
 } iD*L<9  
 else 3 3zE5vr  
 { =;Dj[<mJ45  
  CDialog::OnSysCommand(nID, lParam); g%<n9AUl  
 } e|N~tUVrrN  
} 6EeO\Qj{  
EF6h>"']/  
void CCaptureDlg::OnPaint() 6H=gura&   
{ V503  
 if (IsIconic()) &~=r .T  
 { .cm2L,1h  
  CPaintDC dc(this); // device context for painting z]7/Gc,j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); B"8jEYT5  
  // Center icon in client rectangle XBoq/kbw!  
  int cxIcon = GetSystemMetrics(SM_CXICON); .,20_<j%=  
  int cyIcon = GetSystemMetrics(SM_CYICON); "}V_.I* +  
  CRect rect; Xv3pKf-K  
  GetClientRect(&rect); .5uqc.i"f  
  int x = (rect.Width() - cxIcon + 1) / 2; "([/G?QAG  
  int y = (rect.Height() - cyIcon + 1) / 2; bQ(-M:  
  // Draw the icon T<-_#}.Hn  
  dc.DrawIcon(x, y, m_hIcon); $,yAOaa  
 } 4(p`xdr}K  
 else T+^c=[W  
 { tva=DS  
  CDialog::OnPaint(); W.NZ%~|+e/  
 } `BVmuUMm  
} FWA?mde  
T7%!JBg@  
HCURSOR CCaptureDlg::OnQueryDragIcon() ?U{<g,^  
{ G;$; $gM  
 return (HCURSOR) m_hIcon; em'ADRxG+  
} ,yA[XAz~U  
+:"0 %(  
void CCaptureDlg::OnCancel() T;?k]4.X  
{ BM`6<Z"3q  
 if(bTray) yOt#6Vw  
  DeleteIcon(); *mVg_Kl  
  CDialog::OnCancel(); UKQ"sC  
} 4M|u T 9-  
1I{8 |  
void CCaptureDlg::OnAbout() r *]pL<  
{ U8AH,?]#  
 CAboutDlg dlg; fP V n;  
 dlg.DoModal(); <l $ d>,  
} Z Cjw)To(  
Id##367R  
void CCaptureDlg::OnBrowse() S YDE`-  
{  -X71JU  
 CString str; s<)lC;#e  
 BROWSEINFO bi; C!a1.&HHZ7  
 char name[MAX_PATH]; 0=#>w_B  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); RGE(#   
 bi.hwndOwner=GetSafeHwnd(); ]Ob|!L(  
 bi.pszDisplayName=name; &8z<~q  
 bi.lpszTitle="Select folder"; 4G?^#+|^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :#pdyJQ_  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); /rnI"ze`  
 if(idl==NULL) b.@a,:"  
  return; =I'3C']Z W  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); L_NiU;cr%  
 str.ReleaseBuffer(); &J*M  
 m_Path=str; <ZF|2  
 if(str.GetAt(str.GetLength()-1)!='\\') -(8I?{"4i  
  m_Path+="\\"; k(l2`I4V  
 UpdateData(FALSE); sfj+-se(K.  
} $Sgf jm  
UnF8#~  
void CCaptureDlg::SaveBmp() ( %\7dxiK  
{ =O![>Fu5  
 CDC dc; 2t-w0~O  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &~ y)b`r  
 CBitmap bm; >F7w]XH  
 int Width=GetSystemMetrics(SM_CXSCREEN); )ODF6Ag  
 int Height=GetSystemMetrics(SM_CYSCREEN); )rD!4"8/A  
 bm.CreateCompatibleBitmap(&dc,Width,Height); l9Ir@.m  
 CDC tdc; &)%+DUV|  
 tdc.CreateCompatibleDC(&dc); Xq*^6*E-}  
 CBitmap*pOld=tdc.SelectObject(&bm); VN0We<\Z  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); s|]g@cz an  
 tdc.SelectObject(pOld); '6#G$  
 BITMAP btm; sQvRupYRO  
 bm.GetBitmap(&btm); fkBL`[v)4  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; tcuwGs>_  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); lmvp,BzC  
 BITMAPINFOHEADER bih; 50W+!'  
 bih.biBitCount=btm.bmBitsPixel; _\}'5nmw\  
 bih.biClrImportant=0; G^~[|a 4`  
 bih.biClrUsed=0; ;Y$>WKsV  
 bih.biCompression=0; Y$ ys4X  
 bih.biHeight=btm.bmHeight; amu;grH  
 bih.biPlanes=1; 3/kT'r  
 bih.biSize=sizeof(BITMAPINFOHEADER); &9p!J(C  
 bih.biSizeImage=size;  `Vb  
 bih.biWidth=btm.bmWidth; {AL EK   
 bih.biXPelsPerMeter=0; T{k P9 4  
 bih.biYPelsPerMeter=0; 1iy$n  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?Z7`TnG$uf  
 static int filecount=0; z)qYW6o%  
 CString name; WQK<z!W5  
 name.Format("pict%04d.bmp",filecount++); n/+X3JJ  
 name=m_Path+name; g* q#VmE  
 BITMAPFILEHEADER bfh; Ts5)r(  
 bfh.bfReserved1=bfh.bfReserved2=0; `>gG"1,]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); SS=<\q#MS  
 bfh.bfSize=54+size; /4:bx#;A  
 bfh.bfOffBits=54; { mi}3/  
 CFile bf; MtLWpi u@[  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ef5)z}B   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); RP4/:sO  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &L ;ocd$  
  bf.WriteHuge(lpData,size); Ms{";qiG  
  bf.Close(); ) 7/Cg  
  nCount++; Kg[OUBv  
 } Xwm3# o.&)  
 GlobalFreePtr(lpData);  0#,a#P  
 if(nCount==1) rbw$=bX}  
  m_Number.Format("%d picture captured.",nCount); _4ag-'5  
 else @I _cwUO  
  m_Number.Format("%d pictures captured.",nCount); rhJ&* 0M  
  UpdateData(FALSE); WE<?y_0y&  
} :t}\%%EbmE  
4CNrIF@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jEc_!Q  
{ o.+;]i}D  
 if(pMsg -> message == WM_KEYDOWN) {f/qI`  
 { PobX;Z  
  if(pMsg -> wParam == VK_ESCAPE) @T'^V0!-q:  
   return TRUE; @IT[-d  
  if(pMsg -> wParam == VK_RETURN) lSj gN~:z  
   return TRUE; p=8Qv  
 } +#}GmUwPG$  
 return CDialog::PreTranslateMessage(pMsg); = tv70d'  
} ^|Ap_!t$;  
S$6|K Y u  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V>@[\N[  
{ 44]s`QyG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @CMI$}!{V  
  SaveBmp(); ]g_VPx"  
  return FALSE; 4ot<Uw5  
} q!Du J  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )H8_.]|  
 CMenu pop; U( YAI%O  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); LCF}Y{  
 CMenu*pMenu=pop.GetSubMenu(0); 6x+ujUBkK  
 pMenu->SetDefaultItem(ID_EXITICON); y7Po$)8l  
 CPoint pt; BZq#OA p  
 GetCursorPos(&pt); "F F$Q#)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); X+hHEkJ  
 if(id==ID_EXITICON) B}e/MlX3M  
  DeleteIcon(); /<LZt<K  
 else if(id==ID_EXIT) GABZsdFZ!  
  OnCancel(); t^s&1#iC  
 return FALSE; "TZq")-  
} -JW~_Q[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <2$vo  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ER0 Yl  
 AddIcon(); CSM"Kz`  
 return res; GO"`{|o  
} c[dSO(=  
z7K{ ,y  
void CCaptureDlg::AddIcon() Hon2;-:]{]  
{  Nx}nOm  
 NOTIFYICONDATA data; AdX))xgl  
 data.cbSize=sizeof(NOTIFYICONDATA); v"*r %nCi  
 CString tip; 3I)~;>meo  
 tip.LoadString(IDS_ICONTIP); qmS9*me {  
 data.hIcon=GetIcon(0); [xS7ae  
 data.hWnd=GetSafeHwnd(); lqDCK&g$E#  
 strcpy(data.szTip,tip); ,Qj G|P  
 data.uCallbackMessage=IDM_SHELL; RS5<] dy  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3efOgP=L  
 data.uID=98; n,N->t$i  
 Shell_NotifyIcon(NIM_ADD,&data); aLk3Yg@X  
 ShowWindow(SW_HIDE); c&['T+X  
 bTray=TRUE; MZgaQUg  
} hkK>h  
73Dxf -  
void CCaptureDlg::DeleteIcon() 7)?C+=,0  
{ <)qa{,GX\  
 NOTIFYICONDATA data; =RoE=) 1&-  
 data.cbSize=sizeof(NOTIFYICONDATA); L&\W+k  
 data.hWnd=GetSafeHwnd(); xIdb9hm<  
 data.uID=98; g2OnLEF]s  
 Shell_NotifyIcon(NIM_DELETE,&data); 6pt,]FlU  
 ShowWindow(SW_SHOW); vNO&0~  
 SetForegroundWindow(); eI8o#4nT  
 ShowWindow(SW_SHOWNORMAL); WQ|Ufl;  
 bTray=FALSE; :~-:  
} h ldZA  
Bm~^d7;Cw  
void CCaptureDlg::OnChange() ,Ag{-&  
{ Kz'GAm\  
 RegisterHotkey(); pa-*&p  
} l\_!oa~  
E|=x+M1sH  
BOOL CCaptureDlg::RegisterHotkey() j.M]F/j  
{ ZflB<cI  
 UpdateData(); 3.Fko<D4jD  
 UCHAR mask=0; =dXHQU&Q  
 UCHAR key=0; p$,7qGST  
 if(m_bControl) Bg|d2,im  
  mask|=4; vfSPgUB)  
 if(m_bAlt) Z%~}*F}7X  
  mask|=2; !@C-|=9G  
 if(m_bShift) !t%1G.  
  mask|=1; E:` _P+2p  
  key=Key_Table[m_Key.GetCurSel()]; ju2H 0AQ  
 if(bRegistered){ :3F[!y3b  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); h;=~%2Y  
  bRegistered=FALSE; xI,3(A.  
 } )U/Kz1U  
 cMask=mask; +|C@B`h  
 cKey=key; :7{GOx  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g? vz\_  
 return bRegistered; /#9P0@Y  
} A&}]:4@{  
6AIqoX*p  
  四、小结 yp~z-aRa  
:E W1I>}_  
  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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