社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 6339阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: aD'Ax\-  
   ^QJJ2jZ  
  一、实现方法 [v*q%Mi_  
!|u?z%  
  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: R@tEC)Zn  
;A7JX:*?y=  
#pragma data_seg("shareddata") xypgG;`\  
HHOOK hHook =NULL; //钩子句柄 SvvNk  
UINT nHookCount =0; //挂接的程序数目 w <"mS*Q  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ?f q!BV  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ;sAGTq  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey wik<# ke  
static int KeyCount =0; C|3Xz[k{  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ZxT E(BQv  
#pragma data_seg() BQg3+w:>  
&V (6N%A^U  
  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。 vS0 ii  
!-3;Qj}V  
  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: Y \B6c^E)  
Z^as ?k(iM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR il !B={  
cKey,UCHAR cMask) N_iy4W(NU  
{ 5<v1v&  
 BOOL bAdded=FALSE; ^5TVm>F@3  
 for(int index=0;index<MAX_KEY;index++){ M")/6PH8  
  if(hCallWnd[index]==0){ ;l @lA)i  
   hCallWnd[index]=hWnd; ivq(eKy  
   HotKey[index]=cKey; 6z6\xkr  
   HotKeyMask[index]=cMask; pXN'vP  
   bAdded=TRUE; ?H@<8Ra=3  
   KeyCount++; s9nPxC&A  
   break; 2Zuo).2a.  
  } '#LzQ6Pn  
 } Lkx~>U   
 return bAdded; )&>W/56/  
} YMK ![ q-  
//删除热键 K@cWg C  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~KkC089D  
{ #m?)XB^_  
 BOOL bRemoved=FALSE; sw$uZ$$~#  
 for(int index=0;index<MAX_KEY;index++){ T9Juq6|  
  if(hCallWnd[index]==hWnd){ $S?gQN.e  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L_vl%ii-  
    hCallWnd[index]=NULL; m=^]93+  
    HotKey[index]=0; ][?J8F  
    HotKeyMask[index]=0; vFntzN>#  
    bRemoved=TRUE; 0^o/c SF  
    KeyCount--; W~D_+[P|_  
    break; u|Mx}  
   } +D]raU  
  } 0D@$  
 } -/{FGbpR;  
 return bRemoved; {b4`\ I@<  
} wDW%v@  
*w*>\ZhOm  
-XCs?@8EQ  
  DLL中的钩子函数如下: \ DZ.#=d  
~).D\Q\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +#BOWz  
{ ^ `Ozw^~  
 BOOL bProcessed=FALSE; t&{;6MiE  
 if(HC_ACTION==nCode) \-;f<%+  
 { GVnDN~[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3lpxh_  
   switch(wParam) 0`c{9gY.  
   {  2y^:T'p  
    case VK_MENU: , %z HykP  
     MaskBits&=~ALTBIT; sV%DX5@  
     break; -#;xfJE  
    case VK_CONTROL: Z*mbhod  
     MaskBits&=~CTRLBIT; &Q?@VN i  
     break; U6@c)_* <  
    case VK_SHIFT: Hh=fv~X  
     MaskBits&=~SHIFTBIT; |>]@w\]  
     break; Wmcd{MOS  
    default: //judge the key and send message EC,`t*<  
     break; MU a[}?  
   } QE[<Y3M  
   for(int index=0;index<MAX_KEY;index++){ .aY $-Y<  
    if(hCallWnd[index]==NULL) !KK`+ 9/  
     continue; Y 2ANt w@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pl&nr7\  
    { ur'<8pDb$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Kh$"5dy  
     bProcessed=TRUE; #Iz)Mu  
    } J}xM+l7uY  
   } {E Ay~lo  
  } eZT8gKbjJ)  
  else if((lParam&0xc000ffff)==1){ //有键按下 1a{3k#}  
   switch(wParam) &Z]}rn  
   { Z@+nkTJ9&t  
    case VK_MENU: /v5A)A$7  
     MaskBits|=ALTBIT; EyPJ Jc8  
     break; V2T% tn;rp  
    case VK_CONTROL: JXU ?'@QY  
     MaskBits|=CTRLBIT; ,k4pW&A  
     break; oxc;DfJ_  
    case VK_SHIFT: =+j3E<w  
     MaskBits|=SHIFTBIT; 0!dNW,NfJ  
     break; #'s$6gT=  
    default: //judge the key and send message f- 9t  
     break; 2n@`O g_0  
   } [//i "Nm  
   for(int index=0;index<MAX_KEY;index++){ VrZfjpV  
    if(hCallWnd[index]==NULL) ^*.$@M  
     continue; 23^>#b7st  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U; oXX  
    { ~bb6NP;'L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); P5_Ajb(@'  
     bProcessed=TRUE; u)r/#fUZ  
    } 4joE"H6  
   } @s-P!uCaT  
  } "V]*ov&[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 zT,@PIC(  
   for(int index=0;index<MAX_KEY;index++){ WC~;t4  
    if(hCallWnd[index]==NULL) OmWEa  
     continue; f't.?M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) K)Lo Z^x0)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mv8H:T  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Gr2}N"X=  
   } d|NW&PG  
  } Pqya%j  
 } N { oVz],  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F:ycV~bE  
} a4^hC[a  
:gwmk9LZ  
  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: oa"Bpi9i  
I &iyj 99n  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $oQOOa@;i)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J2VPOn  
:V+rC]0  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: }/1^Lqfnz  
GE!nf6>Km  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *% ;A85V/  
{ u$aK19K/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) La1:WYt  
 { |cY HH$  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 %;:![?M  
  SaveBmp(); .2JZ7  
  return FALSE; }NC$Ce  
 } cDz@3So.b  
 …… //其它处理及默认处理 n?r8ZDJ'  
} pwfQqPC#_  
}5vKQf   
*J[ P#y  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 vm+3!s:u  
C<^i`[&P$  
  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。 mnM]@8^G  
)?[7}(4jI  
  二、编程步骤 j? BL8E'   
Q*#Lr4cm{  
  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"; ON\bD?(VY  
$EFS_*<X  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ek]JzD~w$  
C:Rs~@tl  
  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; I20~bW  
1M??@@X  
  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; G)< B7-72;  
@QmN= X5  
  5、 添加代码,编译运行程序。 h7E?7nR  
SnFyK5  
三、程序代码 ck] I?  
C%yH}T\s  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL As)?~dV  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) F!#)l*OX;  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ im &N &A  
#if _MSC_VER > 1000 AQjv? 4)T  
#pragma once R5=J:o  
#endif // _MSC_VER > 1000 yP$esDP  
#ifndef __AFXWIN_H__ (9%?ik  
#error include 'stdafx.h' before including this file for PCH =_k  
#endif bDWL Hdu a  
#include "resource.h" // main symbols 6Z#Nh@!+C  
class CHookApp : public CWinApp 30^q_|l:]  
{ O.Pp*sQ^  
 public: ++,I`x+p  
  CHookApp(); 85&7WAco"B  
  // Overrides ;?HP/dZLz  
  // ClassWizard generated virtual function overrides _?"y1 L.  
  //{{AFX_VIRTUAL(CHookApp) y60aJ)rAX  
 public: j%'2^C8  
  virtual BOOL InitInstance(); ^oPFLez56  
  virtual int ExitInstance(); G;cC!x<  
  //}}AFX_VIRTUAL O"~[njwkE  
  //{{AFX_MSG(CHookApp) n)5t!  
  // NOTE - the ClassWizard will add and remove member functions here. apm%\dN  
  // DO NOT EDIT what you see in these blocks of generated code ! m^L!_~  
  //}}AFX_MSG :(US um  
  DECLARE_MESSAGE_MAP() :& Dv!z  
}; *.nSv@F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); .S,E=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,4"N7_!7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^?Xs!kJP  
BOOL InitHotkey(); e+BZoK ^  
BOOL UnInit(); Z OPK  
#endif I=&i &6v8G  
+&u/R')?6r  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. PR|z -T  
#include "stdafx.h" ((]i}s0S  
#include "hook.h" [(*Eg!?W=  
#include <windowsx.h> Y(6ev o&IR  
#ifdef _DEBUG P,] ./m\J  
#define new DEBUG_NEW &Pme4IHtm  
#undef THIS_FILE ~vDa2D<9%  
static char THIS_FILE[] = __FILE__; 5?H8?~&dz  
#endif z# &1>  
#define MAX_KEY 100 9cB+ x`+Lu  
#define CTRLBIT 0x04 *ilh/Hd>  
#define ALTBIT 0x02 )I*(yUj  
#define SHIFTBIT 0x01 Ld.9.d]  
#pragma data_seg("shareddata") nQV0I"f]?]  
HHOOK hHook =NULL; $>#0RzU  
UINT nHookCount =0; u4FD}nV  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !o`7$`%Wz\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT (^iF)z  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey [r"Oi| 8I  
static int KeyCount =0; RP{0+  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift c?CfM>  
#pragma data_seg() P x Q]$w  
HINSTANCE hins; c6i7f:'-0  
void VerifyWindow(); v*Gd=\88  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {K+f& 75  
//{{AFX_MSG_MAP(CHookApp) %]7 6u7b/  
// NOTE - the ClassWizard will add and remove mapping macros here. K!\v ?WbF  
// DO NOT EDIT what you see in these blocks of generated code! FW8Zpr!u  
//}}AFX_MSG_MAP 8?LT*>!  
END_MESSAGE_MAP() 2Pm}wD^`  
5B)&;[  
CHookApp::CHookApp() 39O rY  
{ 3 orZBT  
 // TODO: add construction code here, I]d-WTd  
 // Place all significant initialization in InitInstance w.58=Pr  
} 'MW%\W;  
M *w{PjU  
CHookApp theApp; ( gg )?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) AJB NM  
{ giu{,gS0?M  
 BOOL bProcessed=FALSE; E`_T_O=P  
 if(HC_ACTION==nCode) ?l%4 P5  
 { 4F.,Y3  
  if((lParam&0xc0000000)==0xc0000000){// Key up P `@Rt  
   switch(wParam) bu6Sp3g  
   { A{;"e^a-^l  
    case VK_MENU: jC[_uG  
     MaskBits&=~ALTBIT; Q(-&}cY  
     break; :qxWANUa  
    case VK_CONTROL: cdkEK  
     MaskBits&=~CTRLBIT; 5FJLDT2Lg  
     break; yfV]f LZ  
    case VK_SHIFT: roc DO8f  
     MaskBits&=~SHIFTBIT; >m lQ@Z_O  
     break; 'd Be,@  
    default: //judge the key and send message {Ni]S$7  
     break; Ojz'p5d`>  
   } Lqxh y s  
   for(int index=0;index<MAX_KEY;index++){ vrb@::sy0T  
    if(hCallWnd[index]==NULL) 1_S]t[?I/  
     continue; nZnqXclzxn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c=+%][21  
    { V~*>/2+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); c! kr BS  
     bProcessed=TRUE; fx+_;y  
    } nuWQ3w p[e  
   } VK*_p EV,}  
  } wi+Q lf  
  else if((lParam&0xc000ffff)==1){ //Key down y}oA!<#3  
   switch(wParam) =&08s(A  
   { 4>oM5Yf8  
    case VK_MENU: glCpA$;VPu  
     MaskBits|=ALTBIT; az![u)  
     break; (N&i4O-I  
    case VK_CONTROL: py7Zh%k  
     MaskBits|=CTRLBIT; !HU$V9C  
     break; YK{J"Kof  
    case VK_SHIFT: 'cc8 xC  
     MaskBits|=SHIFTBIT; 7+f6?  
     break; [err$  
    default: //judge the key and send message R.WB.FP  
     break; d #1& "(   
   } 40MKf/9  
   for(int index=0;index<MAX_KEY;index++) \:Tq0|]Px  
   { 4vi?9MPz  
    if(hCallWnd[index]==NULL) %dnpO|L  
     continue; r e zp7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [;IEZ/ZX  
    { L&s~j/ pR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AJ>E\DK0]  
     bProcessed=TRUE; c-JXWNz  
    } VD&wO'U  
   } @&m]:GR  
  }  m-4#s  
  if(!bProcessed){ >b"@{MZ@t  
   for(int index=0;index<MAX_KEY;index++){ ,N:^4A  
    if(hCallWnd[index]==NULL) J'|[-D-a  
     continue; 4|&/# Cz^Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C zw]5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Sak^J.~G[  
   } ;6R9k]5P%  
  } _Ycz@Jn  
 } ;taZixOH  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1@{ov!YB]  
} 7#+Ih-&EQ  
]tu OWR  
BOOL InitHotkey() M887 Q'HSi  
{ k-3;3Mq  
 if(hHook!=NULL){ Q8Ek}O\MC  
  nHookCount++; RQWUO^&e^  
  return TRUE; O,),0zcYF  
 } Z*w({k7]  
 else Zs/-/C|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,=CipL9]  
  if(hHook!=NULL) \?v&JmEU  
   nHookCount++; 0 N7I:vJ  
  return (hHook!=NULL); p/_W*0/i  
} 9;XbyA]  
BOOL UnInit() MVzj7~+  
{ p_BG#dRM  
 if(nHookCount>1){ XGR63hXND  
  nHookCount--; KB~1]cYMp  
  return TRUE; "Cxj_V@\  
 } 16eP7s  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }2S!;swg+  
 if(unhooked==TRUE){ 6!0NFP~b  
  nHookCount=0; <<S4l~"o  
  hHook=NULL; cd,'37pZ  
 } cHr]{@7Cs  
 return unhooked; ='D%c^;O8'  
} bE% Hm!  
gNxv.6Pp=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >CKa?N;  
{ 5K9W5hA:D  
 BOOL bAdded=FALSE; r)>'cjx/  
 for(int index=0;index<MAX_KEY;index++){ SE(<(w  
  if(hCallWnd[index]==0){ *-]k([wV  
   hCallWnd[index]=hWnd; i| cA)  
   HotKey[index]=cKey; |%8t.Z  
   HotKeyMask[index]=cMask; 2u_=i$xW  
   bAdded=TRUE; gYbvCs8O!  
   KeyCount++; n%;qIKnIq\  
   break; "?k'S{;  
  } +,"[0RH  
 } fXnTqKAfu6  
 return bAdded; _Q^jk0K8ga  
} =aj|auu  
0e"KdsA:<U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "Vc|D (g  
{ bZWR. </  
 BOOL bRemoved=FALSE; 9{nU\am!\  
 for(int index=0;index<MAX_KEY;index++){ _6.@^\;  
  if(hCallWnd[index]==hWnd){ Bz ,D4 E$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p=[dt  
    hCallWnd[index]=NULL; 7Y~5gn  
    HotKey[index]=0; R-n%3oh  
    HotKeyMask[index]=0; 7>7n|N  
    bRemoved=TRUE; g-#eMQ%J  
    KeyCount--; QP<P,Bi~  
    break; moVf(7  
   } #|769=1  
  } ZHA&gdK@  
 } 3<FqK\P  
 return bRemoved; H"pYj  
} }T902RL0  
vQXF$/S  
void VerifyWindow() myXGMN$i  
{ *URY8 a`bO  
 for(int i=0;i<MAX_KEY;i++){ eWYet2!Q  
  if(hCallWnd!=NULL){ `m AYK)N  
   if(!IsWindow(hCallWnd)){ .-s!} P"  
    hCallWnd=NULL; Qh3+4nLFtb  
    HotKey=0; )I<VH +6  
    HotKeyMask=0; T06w`'aL  
    KeyCount--; Zq1> M'V;  
   } '%Oo1:wJ  
  } $?: -A  
 } RToX[R;1E  
} 0=`aXb-  
z}5'TV=^  
BOOL CHookApp::InitInstance() 0_y&9Te  
{ PK?}hz  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); D0f7I:i1  
 hins=AfxGetInstanceHandle(); S#+ _HFUK{  
 InitHotkey(); .*EP$pc  
 return CWinApp::InitInstance(); (#je0ES  
} .q]K:}9!\  
FGwgSrXL7  
int CHookApp::ExitInstance() ,V4pFQzL  
{ aM[fag$c  
 VerifyWindow(); cEJ_z(\=hr  
 UnInit(); F r2 +p  
 return CWinApp::ExitInstance(); ,h3,& ,  
}  ;XYfw)  
3kJSz-_M  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Grd9yLF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #2.C$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ OZ Obx  
#if _MSC_VER > 1000 < R@&<E6  
#pragma once 2(D&jL  
#endif // _MSC_VER > 1000 wL0"1Ya  
kgmb<4p  
class CCaptureDlg : public CDialog jS/$ o?  
{ U/(R_U>=  
 // Construction yCg>]6B  
 public: H<b4B$/  
  BOOL bTray; 4f0dc\$  
  BOOL bRegistered; GEb)nHQq  
  BOOL RegisterHotkey(); |("5 :m  
  UCHAR cKey; hW c M.  
  UCHAR cMask; NX+ eig</-  
  void DeleteIcon(); ;rF:$37^  
  void AddIcon(); gY=+G6;=<  
  UINT nCount; 6d 8n1_  
  void SaveBmp(); N) z] F9Kg  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor  93 `  
  // Dialog Data QPF[D7\  
  //{{AFX_DATA(CCaptureDlg) |4Q><6"G  
  enum { IDD = IDD_CAPTURE_DIALOG }; ',RR*{I  
  CComboBox m_Key; +n`^W(  
  BOOL m_bControl; yFP#z5G  
  BOOL m_bAlt; .Qj`_q6=  
  BOOL m_bShift; 0Zl1(;hx@  
  CString m_Path; i%B$p0U<  
  CString m_Number; tQ?}x#J  
  //}}AFX_DATA e''Wm.>g(+  
  // ClassWizard generated virtual function overrides ':]w  
  //{{AFX_VIRTUAL(CCaptureDlg) w@f_TG"Vt  
 public: zjJyc?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); WUi7~Ei}  
 protected: %}&9[#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L' h'm{i  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); PsD]gN5"  
  //}}AFX_VIRTUAL sAc)X!}  
  // Implementation 0P53dF  
 protected: BQ&h&57K  
  HICON m_hIcon; /L[:C=u  
  // Generated message map functions }`^<ZNkb/  
  //{{AFX_MSG(CCaptureDlg) `}Hnj*  
  virtual BOOL OnInitDialog(); 1$2Rs-J  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); CUw 9aH  
  afx_msg void OnPaint(); 1r w>gR  
  afx_msg HCURSOR OnQueryDragIcon(); qOa-@MN  
  virtual void OnCancel(); oq<#  
  afx_msg void OnAbout(); +V\NMW4d  
  afx_msg void OnBrowse(); )'<zC  
  afx_msg void OnChange(); bm7$DKp#  
 //}}AFX_MSG r*3XM{bZ/@  
 DECLARE_MESSAGE_MAP() 'XQv>J  
}; A><%"9pZ  
#endif +Q_Gm3^  
pV-.r-P  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file q C|re!K  
#include "stdafx.h" aA yFu_  
#include "Capture.h" ->#7_W  
#include "CaptureDlg.h" @o^sp|k !  
#include <windowsx.h> Vgm{=$  
#pragma comment(lib,"hook.lib") B'0Il"g'  
#ifdef _DEBUG ,>jm|BTD {  
#define new DEBUG_NEW (}qLxZ/U  
#undef THIS_FILE V[#lFl).  
static char THIS_FILE[] = __FILE__; Ul@' z|  
#endif $1@{Zz!S  
#define IDM_SHELL WM_USER+1 p9sxA|O=y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4-n.4j|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bKaV]Uy  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \)"qN^we  
class CAboutDlg : public CDialog ?%0i,p@<  
{ -jw=Iyv  
 public: " 7 4L  
  CAboutDlg(); ]V]o%onW  
  // Dialog Data XF$C)id2p  
  //{{AFX_DATA(CAboutDlg) Zj<T#4?8  
  enum { IDD = IDD_ABOUTBOX }; hP#&]W3:  
  //}}AFX_DATA wb9zJAsc  
  // ClassWizard generated virtual function overrides e)bqE^JP  
  //{{AFX_VIRTUAL(CAboutDlg) Tuy*Df  
 protected: +[7u>RJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support liB>~DVC  
  //}}AFX_VIRTUAL Y{'G2)e  
  // Implementation Stw6%T-  
 protected: y|mR'{$I  
  //{{AFX_MSG(CAboutDlg) Q& \k"X1  
  //}}AFX_MSG \ a<Ye T  
  DECLARE_MESSAGE_MAP() 1wM p3  
}; 1|89-Ii]  
5~? J  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) abv]  
{ cS[`1y,\3  
 //{{AFX_DATA_INIT(CAboutDlg) 0nuFWV  
 //}}AFX_DATA_INIT A,/S/_Q=  
} P$QfcJq&c*  
']NM_0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) O#|E7;  
{ &pAT  
 CDialog::DoDataExchange(pDX); pQhv3F  
 //{{AFX_DATA_MAP(CAboutDlg) w {q YP  
 //}}AFX_DATA_MAP Vqr&)i"b$  
} eyWwE%  
3IxT2@H)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ] 7O?c=  
 //{{AFX_MSG_MAP(CAboutDlg) -|kDa1knA  
 // No message handlers YD%Kd&es  
 //}}AFX_MSG_MAP sig_2;  
END_MESSAGE_MAP() 3N21[i2/m  
;vx9xs?6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) HTG;'$H^  
: CDialog(CCaptureDlg::IDD, pParent) h^)2:0#{I  
{ dd+).*  
 //{{AFX_DATA_INIT(CCaptureDlg) xVP GlU  
  m_bControl = FALSE; b6(yyYdF  
  m_bAlt = FALSE; Bk F[nL*|  
  m_bShift = FALSE; G~Sfpf  
  m_Path = _T("c:\\"); ~eP 2PG  
  m_Number = _T("0 picture captured."); ;D7jE+  
  nCount=0; A!~o?ej  
  bRegistered=FALSE; ^pP 14y*go  
  bTray=FALSE; @wPmx*SF  
 //}}AFX_DATA_INIT zkOgL9 (_8  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 73.b9mF  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m~K]|]iqQ  
} zl[JnVF\6  
{mQJ6 G'ny  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #@fypCc  
{ gr=`_k4~1  
 CDialog::DoDataExchange(pDX); >seB["C  
 //{{AFX_DATA_MAP(CCaptureDlg) BSY#xe V  
  DDX_Control(pDX, IDC_KEY, m_Key); m @%|Q;  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); >vU Hf`4T  
  DDX_Check(pDX, IDC_ALT, m_bAlt); bW]+Og  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +*q@=P,  
  DDX_Text(pDX, IDC_PATH, m_Path); /~[R u  
  DDX_Text(pDX, IDC_NUMBER, m_Number); %ab79RS]C  
 //}}AFX_DATA_MAP jo*9QO  
} -G 'lyH  
YovY0nO  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) v=>Gvl3&U  
//{{AFX_MSG_MAP(CCaptureDlg) URgF8?n  
 ON_WM_SYSCOMMAND() v#FUD-Z  
 ON_WM_PAINT() C(t/:?(y  
 ON_WM_QUERYDRAGICON() #`$7$Y~]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Xn=fLb(  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 86g+c  
 ON_BN_CLICKED(ID_CHANGE, OnChange) c"ztrKQQ  
//}}AFX_MSG_MAP 'Ap 5Aq  
END_MESSAGE_MAP() nmGHJb,$  
a5M>1&j/eC  
BOOL CCaptureDlg::OnInitDialog() <GN?J.B  
{ Vvj]2V3  
 CDialog::OnInitDialog(); 8rYK~Sz  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @El<"\  
 ASSERT(IDM_ABOUTBOX < 0xF000); M\f0 =`g  
 CMenu* pSysMenu = GetSystemMenu(FALSE); s|T7)PgR  
 if (pSysMenu != NULL) F{ ,O+\  
 { 08a|]li  
  CString strAboutMenu; [Bo$?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); KF)i66  
  if (!strAboutMenu.IsEmpty()) 3D0I5LF&  
  { z<>_*Lfj  
   pSysMenu->AppendMenu(MF_SEPARATOR); ^@2Vh*k  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #Au&2_O  
  } 6]S.1BP  
 } "_j7kYAl  
 SetIcon(m_hIcon, TRUE); // Set big icon U^&Cvxc[[  
 SetIcon(m_hIcon, FALSE); // Set small icon X;:xGZ-oY  
 m_Key.SetCurSel(0); +kL(lBv'  
 RegisterHotkey(); dk/*%a +  
 CMenu* pMenu=GetSystemMenu(FALSE); N}G(pq}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 1`{ib  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); G6 5N:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); D$E9%'ir  
 return TRUE; // return TRUE unless you set the focus to a control `t&;Yk]-L  
} C 5 UDez  
_4$DnQ6&  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (?y2@I}  
{ IcQ!A=lB  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ".?{Y(~  
 { (K6S tNtN  
  CAboutDlg dlgAbout; ]s@8I2_  
  dlgAbout.DoModal(); #7h fEAk  
 } V&H8-,7z  
 else (02(:;1  
 { w>_EM&r6~u  
  CDialog::OnSysCommand(nID, lParam); zP}v2  
 } )6^xIh  
} rU@?v+i  
3H2;mqq  
void CCaptureDlg::OnPaint() I>Q,]S1h  
{ VYo;[ue([  
 if (IsIconic()) dy?|Q33Y"  
 { XH$|DeAFM  
  CPaintDC dc(this); // device context for painting q&T'x> /  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); f*}E\,V"&  
  // Center icon in client rectangle CJ  
  int cxIcon = GetSystemMetrics(SM_CXICON); t}*!UixE  
  int cyIcon = GetSystemMetrics(SM_CYICON); (t$/G3E  
  CRect rect; cV,Dl`1r  
  GetClientRect(&rect); Po. BcytM  
  int x = (rect.Width() - cxIcon + 1) / 2; \r,. hUp  
  int y = (rect.Height() - cyIcon + 1) / 2; $:II @=  
  // Draw the icon #9VY[<  
  dc.DrawIcon(x, y, m_hIcon); #/<Y!qV&  
 } 4 GW[GT  
 else g}QTZT8  
 { I>Fh*2  
  CDialog::OnPaint(); a&Du5(r;!  
 } XF$]KA L0  
} T k&9Klo  
%nf=[f  
HCURSOR CCaptureDlg::OnQueryDragIcon() g8A{aHb1}  
{ !13 /+ u  
 return (HCURSOR) m_hIcon; u#k ,G`  
} AiK4t-  
iGVb.=)  
void CCaptureDlg::OnCancel() #-j! ;?  
{ B-'BJ|*4I  
 if(bTray) 8k?L{hF|nW  
  DeleteIcon(); }AZx/[k |z  
  CDialog::OnCancel(); *[:CbFE0y  
} Yka&Kkw  
mIEaWE;E"  
void CCaptureDlg::OnAbout() 9R"N#w.U]  
{ ik0Q^^1?Y  
 CAboutDlg dlg; n4T2'e  
 dlg.DoModal(); W;]U P$5l  
} )wv[!cYyW  
.t[ZXrd| 0  
void CCaptureDlg::OnBrowse() .+L_!A  
{ l!V| T?  
 CString str; 0lr4d Y  
 BROWSEINFO bi; {<4?o? 1 g  
 char name[MAX_PATH]; 6@;L$QYY-V  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _|wY[YJ[  
 bi.hwndOwner=GetSafeHwnd(); x~Ly$A2p  
 bi.pszDisplayName=name; Z)T@`B6  
 bi.lpszTitle="Select folder"; ?V:]u 3  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; `+Z#*lj|@  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); bK$D lBZ  
 if(idl==NULL) @ ^6OV)  
  return; ur,"K' w  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); bTy)0ta>AF  
 str.ReleaseBuffer(); <;0N@  
 m_Path=str; ';|>`<  
 if(str.GetAt(str.GetLength()-1)!='\\') {^5<{j3e  
  m_Path+="\\"; )k] !u  
 UpdateData(FALSE); uNZ>oP>  
} ^ R^N`V   
B "F`OS[  
void CCaptureDlg::SaveBmp() ^ O Xr: P  
{ Q[Sd  
 CDC dc; s5aOAyb*w  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); (VPM>ndkw  
 CBitmap bm; K(KP3Q  
 int Width=GetSystemMetrics(SM_CXSCREEN); ) wo2GF  
 int Height=GetSystemMetrics(SM_CYSCREEN);  [Ro0eH  
 bm.CreateCompatibleBitmap(&dc,Width,Height); /Q>{YsRRB  
 CDC tdc; K-k.=6mS  
 tdc.CreateCompatibleDC(&dc); ],}afa!A  
 CBitmap*pOld=tdc.SelectObject(&bm); wt=>{JM  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); h*%0@  
 tdc.SelectObject(pOld); = *;Xc-_  
 BITMAP btm; w$[Ds  
 bm.GetBitmap(&btm); |U$de2LF  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ecqz@*d&  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); O-!fOdX8_k  
 BITMAPINFOHEADER bih; QD;f~fZ  
 bih.biBitCount=btm.bmBitsPixel; (6#yw`\  
 bih.biClrImportant=0; H0b6ZA%n  
 bih.biClrUsed=0; ivUsMhx>S,  
 bih.biCompression=0; !0csNg!  
 bih.biHeight=btm.bmHeight; Q'Kik5I  
 bih.biPlanes=1; dIfs 8%kl  
 bih.biSize=sizeof(BITMAPINFOHEADER); 6|>\&Y!Q  
 bih.biSizeImage=size; 9H, &nET  
 bih.biWidth=btm.bmWidth; &G@-yQ  
 bih.biXPelsPerMeter=0; KgTGxCH  
 bih.biYPelsPerMeter=0; kl3S~gE4@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )\D40,p  
 static int filecount=0; e]*=sp!T  
 CString name; P2Qyz}!wo  
 name.Format("pict%04d.bmp",filecount++); r {B,uj"  
 name=m_Path+name; fByh";<`P  
 BITMAPFILEHEADER bfh; & kjwIg{  
 bfh.bfReserved1=bfh.bfReserved2=0; fzFvfMAU  
 bfh.bfType=((WORD)('M'<< 8)|'B'); R4~zL!7;  
 bfh.bfSize=54+size; Wt)SdF=U/  
 bfh.bfOffBits=54; ZH$sMh<xg  
 CFile bf; ZOrTbik  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @U /3iDB\  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3 +8"  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,+f0cv4  
  bf.WriteHuge(lpData,size); m~j\?mb{+  
  bf.Close(); ~Ri u*<  
  nCount++; 01{r^ZT`RH  
 } ?y*+^E0  
 GlobalFreePtr(lpData); 6`4W,  
 if(nCount==1) Y zBA{FE  
  m_Number.Format("%d picture captured.",nCount); /@:up+$  
 else nc\C 4g  
  m_Number.Format("%d pictures captured.",nCount); ? __aVQ7  
  UpdateData(FALSE); d7_g u  
} 0n<(*bfW  
w^due P7J  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) *e-ptgO  
{ ,y8I)+  
 if(pMsg -> message == WM_KEYDOWN) <jRFN&"h}  
 { 6mF{ImbRbS  
  if(pMsg -> wParam == VK_ESCAPE) {r].SrW9s9  
   return TRUE; `J=1&ae{  
  if(pMsg -> wParam == VK_RETURN) >\?z37 :T  
   return TRUE; Yf!*OGF  
 } eb.cq"C  
 return CDialog::PreTranslateMessage(pMsg); @( n^S?(  
} 16[-3cJ T  
`Ge+(1x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) jqX@&}3@  
{ >Z2,^5P{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Rgfc29(8  
  SaveBmp(); pe!dm}!h[  
  return FALSE; x'M^4{4[  
} I>kiah*  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ hM36QOdm  
 CMenu pop; `z?KL(rI  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =,AC%S_D~  
 CMenu*pMenu=pop.GetSubMenu(0); iO9nvM<  
 pMenu->SetDefaultItem(ID_EXITICON); KYkS6|A  
 CPoint pt; |,1bkJt  
 GetCursorPos(&pt); 0 .FHdJ<  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1~R$$P11[9  
 if(id==ID_EXITICON) R*Xu( 89  
  DeleteIcon(); 5U)ab3 :  
 else if(id==ID_EXIT) }#ep}h  
  OnCancel(); Tbi]oB#  
 return FALSE; c>R`jb@$N  
} Wiq{wxe  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0j{F^rph  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) joChML_  
 AddIcon(); O/D Af|X|  
 return res; mZbWRqP[|_  
} cZDxsd]  
9RCO|J  
void CCaptureDlg::AddIcon() %R.xS} Q  
{ @ kJ0K  
 NOTIFYICONDATA data; w*<Y$hnBzF  
 data.cbSize=sizeof(NOTIFYICONDATA); [:nx);\  
 CString tip; >k&8el6h  
 tip.LoadString(IDS_ICONTIP); Q$|^~  
 data.hIcon=GetIcon(0); ':!3jZP"m  
 data.hWnd=GetSafeHwnd(); ^nHB1"OCV  
 strcpy(data.szTip,tip); pK6e/eC  
 data.uCallbackMessage=IDM_SHELL; ] Wx>)LT  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 6Iv(  
 data.uID=98; (2 T#/$  
 Shell_NotifyIcon(NIM_ADD,&data); +9CEC1-l  
 ShowWindow(SW_HIDE); *%T)\\H2  
 bTray=TRUE; I #M%%5e  
} "K|)<6J  
@,x_i8  
void CCaptureDlg::DeleteIcon() 6%gB E  
{ }A4nJ>`tq  
 NOTIFYICONDATA data; i\=z'  
 data.cbSize=sizeof(NOTIFYICONDATA); x7P([^i  
 data.hWnd=GetSafeHwnd(); Sc1+(z  
 data.uID=98; > $w^%I  
 Shell_NotifyIcon(NIM_DELETE,&data); Q;$ 9qOF  
 ShowWindow(SW_SHOW); W NwJM  
 SetForegroundWindow(); s;fVnaqG:  
 ShowWindow(SW_SHOWNORMAL); eeW' [  
 bTray=FALSE; L bJtpwz>z  
} 0$eyT-:d  
~9JW#HHzn  
void CCaptureDlg::OnChange() |'V DI]p&  
{ O!+nF]V4f  
 RegisterHotkey(); L@{!r=%_>  
} )p$\gwr=2  
M11"<3]D  
BOOL CCaptureDlg::RegisterHotkey() 4meidKw]  
{ u(pdP"  
 UpdateData(); \C]i|]tl  
 UCHAR mask=0; H+4=|mkQ  
 UCHAR key=0; {8^Gs^c c  
 if(m_bControl) `6a]|7|f  
  mask|=4; _4P;+Y  
 if(m_bAlt) Q7,EY /  
  mask|=2; uP{; *E3?  
 if(m_bShift) b!i`o%Vb  
  mask|=1; e#>tM  
  key=Key_Table[m_Key.GetCurSel()]; T*h!d(  
 if(bRegistered){ D 4< -8  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); IK*oFo{C=K  
  bRegistered=FALSE; Y%<`;wK=^  
 } \*f;!{P{  
 cMask=mask; az0cS*@  
 cKey=key; Vh"MKJ'R^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9o-!ecx}  
 return bRegistered; kWB, ;7  
} Gs[Vu@*  
cCM j\H@  
  四、小结 UdT&cG  
[RAj3Fr0  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八