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
  • 6783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: &y"e|aE  
  ^3?]S{1/#  
  一、实现方法 ,;9byb  
z/yNFY]i  
  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: %7WGodlXW  
*^+8_%;1  
#pragma data_seg("shareddata") qELy'\  
HHOOK hHook =NULL; //钩子句柄 k_$:?$  
UINT nHookCount =0; //挂接的程序数目 ^F/gJ3_;  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4sOo>.<x  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 W=j  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey H.#<&5f  
static int KeyCount =0; R@_i$Df|  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 g9~>mJR  
#pragma data_seg() Q^=drNV  
x-0S-1M  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 i|A0G%m]$  
x%HX0= (  
  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: CPGiKE  
5lehASBz  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Fy_D[g  
cKey,UCHAR cMask) kpFt  
{ e7rD,`NiV  
 BOOL bAdded=FALSE; R >1  
 for(int index=0;index<MAX_KEY;index++){ q))r lMo  
  if(hCallWnd[index]==0){ ^ 'W<|  
   hCallWnd[index]=hWnd;  vU(2[  
   HotKey[index]=cKey; <pzCpF<  
   HotKeyMask[index]=cMask; /~RY{ c@#L  
   bAdded=TRUE; HX\^ecZ#E  
   KeyCount++; iOk^RDG+  
   break; ;#a^M*e  
  } zyb>PEd.  
 } v%8.o%G  
 return bAdded; <49Gsm&0  
} M}Sn$h_  
//删除热键 {uVvo=3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l!z)gto  
{ |Et8FR3[m  
 BOOL bRemoved=FALSE; \/E+nn\)  
 for(int index=0;index<MAX_KEY;index++){ M'gw-^(  
  if(hCallWnd[index]==hWnd){ Xtv^q> !  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ M:&g5y&  
    hCallWnd[index]=NULL; RlJt+lnV  
    HotKey[index]=0; A|3'9iL{9  
    HotKeyMask[index]=0; !>gi9z,  
    bRemoved=TRUE; J${'?!N  
    KeyCount--; };{V]f 0  
    break; (.Q.S[<Y  
   } w<}kY|A"=-  
  } <OF2\#Nh  
 } OEMYS I%  
 return bRemoved; BllS3I}V  
} iKs @oHW  
KY}c}*0  
@K{1O|V  
  DLL中的钩子函数如下: c;X8: Z=ja  
tkQ#mipAj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) SvE3E$*  
{ LHit9O[_/s  
 BOOL bProcessed=FALSE; &d1|B`gL|  
 if(HC_ACTION==nCode) glk-: #  
 { y;oPg4  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 :zN{>,sC  
   switch(wParam) XEK%\o}  
   {  S.G"*'N  
    case VK_MENU: 8n_!WDD  
     MaskBits&=~ALTBIT; 954!ED|F(  
     break; v[-.]b*5A$  
    case VK_CONTROL: tb#9TF  
     MaskBits&=~CTRLBIT; LBO3){=J  
     break; \9r1JP0  
    case VK_SHIFT: ~=xiMB;oH  
     MaskBits&=~SHIFTBIT; W@"s~I6  
     break; ^g^R[8  
    default: //judge the key and send message "gaurr3  
     break; $hND!T+;  
   } 'IVNqfC)u  
   for(int index=0;index<MAX_KEY;index++){ u`K)dH,  
    if(hCallWnd[index]==NULL) q.xt%`@aA  
     continue; [w>T.b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ] yg3|C;  
    { &A}@@d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2L\}  
     bProcessed=TRUE; Nu}x`Qkmr  
    } G3[X.%g`  
   } v@_^h}h/,=  
  } |AgdD  
  else if((lParam&0xc000ffff)==1){ //有键按下 j%_{tB  
   switch(wParam) ?%)G%2  
   { yH YqJ|t  
    case VK_MENU: `;X~$uS  
     MaskBits|=ALTBIT; _SVIY@K|/  
     break; )1E[CIaXK  
    case VK_CONTROL: \W%Aeg*c  
     MaskBits|=CTRLBIT; l:' 0  
     break; ,q[aV 6kO  
    case VK_SHIFT:  (TKn'2  
     MaskBits|=SHIFTBIT; d'bAM{R>  
     break; 0O@UT1 M;v  
    default: //judge the key and send message idG}p+(;  
     break; h mijp1u  
   } cD&QN9  
   for(int index=0;index<MAX_KEY;index++){ B4uJT~,7>  
    if(hCallWnd[index]==NULL) NFYo@kX> G  
     continue; E;I'b:U`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0-s[S  
    { yaDK_fk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); kK62yz,  
     bProcessed=TRUE; Ln&'5D#  
    } G0e]PMeFl  
   } 06)B<  
  } q4Rvr[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 n:TWZ.9  
   for(int index=0;index<MAX_KEY;index++){ r2t|,%%N7  
    if(hCallWnd[index]==NULL) )Id.yv}_  
     continue; QYS 1.k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E2hy%y9Tp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); NA=I7I@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !PAuMj)P  
   } 6!QY)H^j9,  
  } dq6|m }g{  
 } %1\MW+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); bi:TX<K+  
} JI)@h 4b  
6}q8%[l|  
  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: 6ct'O**k*&  
'MWu2L!F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XWuHH;~*L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); VLL CdZ%  
#0:N$'SZ  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: -gq,^j5,  
|(evDS5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F]fBFDk  
{ .m;5s45O{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) m|/q o  
 { g`n5-D@3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `]T# uP<u  
  SaveBmp(); zyHHz\{  
  return FALSE; fN|'aq*Pd  
 } F4b$  
 …… //其它处理及默认处理 KscugX*x  
} MS>QU@z7c  
n7>L&?N#y#  
"t ^yM`$5[  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 {S$]I)tV  
$\9M6k'  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 CogN1,GJ  
+N3f{-{"Yo  
  二、编程步骤 Dr_ (u<[  
zJMm=Mw^  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; >QA;02  
^!FLi7X  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -wdd'G  
X5Fi , /H  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 5`3Wua  
uOv0ut\\G  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; :(?F(Q^  
Y!1x,"O'H  
  5、 添加代码,编译运行程序。 CRh.1-  
'ZiTjv ]  
三、程序代码 ab!Cu8~v  
F\Z|JCA  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL SQS PdR+  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) VfFXH,j  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ GN=ugP 9  
#if _MSC_VER > 1000 @OB7TI_/   
#pragma once ~BbF:DS  
#endif // _MSC_VER > 1000 y~r5KB6w  
#ifndef __AFXWIN_H__ d#W>"Cqxqa  
#error include 'stdafx.h' before including this file for PCH .7`c(9<  
#endif S^z t>  
#include "resource.h" // main symbols p~evPTHnrX  
class CHookApp : public CWinApp \46 'j.  
{ qX%oLa  
 public: Y0 ?<~Gf  
  CHookApp(); U;q GUqI  
  // Overrides v>!tws5e  
  // ClassWizard generated virtual function overrides {gkY:$xnrG  
  //{{AFX_VIRTUAL(CHookApp) N!Cy)HnS\w  
 public: 8-_\Q2vG  
  virtual BOOL InitInstance(); r9vO(m~  
  virtual int ExitInstance(); rG t/ /6  
  //}}AFX_VIRTUAL JNL9t0 x  
  //{{AFX_MSG(CHookApp) 4~DW7 (  
  // NOTE - the ClassWizard will add and remove member functions here. H[e=^JuD  
  // DO NOT EDIT what you see in these blocks of generated code ! `^G?+p2E  
  //}}AFX_MSG >OotgJnhC  
  DECLARE_MESSAGE_MAP() {Y6;/".DM  
}; nX>HRdC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); u]$e@Vw.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !\hUjM+(}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vFx0B?  
BOOL InitHotkey(); 0)0,&@])7  
BOOL UnInit(); I%b}qC"5M  
#endif 6E))4 lW  
D\LXjEm e.  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. P:QSr8K  
#include "stdafx.h" ^!j,d_)b!  
#include "hook.h" ui!MQk+D9  
#include <windowsx.h> `%<^$Ng;  
#ifdef _DEBUG Xf/qUao  
#define new DEBUG_NEW _Z0O]>KH  
#undef THIS_FILE #[ TOe  
static char THIS_FILE[] = __FILE__; )r`F}_CEL  
#endif 8w\ZY>d   
#define MAX_KEY 100 *f*o ,~8V1  
#define CTRLBIT 0x04 WW[Gne  
#define ALTBIT 0x02 n%&+yg   
#define SHIFTBIT 0x01 =K8z8K?  
#pragma data_seg("shareddata") t \;,$i  
HHOOK hHook =NULL; XnNU-UCX  
UINT nHookCount =0; }}q_QD_  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey D6NgdE7b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT F&6Xo]?  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey bL 9XQ:$C  
static int KeyCount =0; 4RDdfY\%u  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 2)4oe  
#pragma data_seg() ELgq#z  
HINSTANCE hins; ~^ ^|]s3  
void VerifyWindow(); CS\T@)@t  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ^,sKj-  
//{{AFX_MSG_MAP(CHookApp) b!gvvg<  
// NOTE - the ClassWizard will add and remove mapping macros here. g7g^iLU  
// DO NOT EDIT what you see in these blocks of generated code! -8%[ 7Z]  
//}}AFX_MSG_MAP S @tpd'  
END_MESSAGE_MAP() =&-+{txs  
iRsK; )<  
CHookApp::CHookApp() '^ob3N/Y [  
{ xL#UMvZ>;h  
 // TODO: add construction code here, @";zM&  
 // Place all significant initialization in InitInstance upefjwm  
} Bf+7;4-  
qf?X:9Wt  
CHookApp theApp; Ns#R`WG)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Dqg~g|(Q<  
{ Jd-u ?  
 BOOL bProcessed=FALSE; tO8<N'TD  
 if(HC_ACTION==nCode) WcZck{ehd  
 { o>?#$~XNv  
  if((lParam&0xc0000000)==0xc0000000){// Key up k=``Avp?  
   switch(wParam) Z+M* z;  
   { {<#~Ya-  
    case VK_MENU: >[&Zs3>  
     MaskBits&=~ALTBIT; 0$1-5XY9  
     break; dHJ#xmE!pP  
    case VK_CONTROL: *)0-N!N#)  
     MaskBits&=~CTRLBIT; J<27w3bs~p  
     break; }N`m7PSf  
    case VK_SHIFT: [~U CYYl  
     MaskBits&=~SHIFTBIT; |4?O4QN  
     break; M.h8Kr!.  
    default: //judge the key and send message w^N3Ma  
     break; Pp ~:e}  
   } p)y'a+|7  
   for(int index=0;index<MAX_KEY;index++){ *-lw2M9V  
    if(hCallWnd[index]==NULL) "&{sE RYY  
     continue; am(jmf::  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Kq4b`cn{_  
    { K'u66%wAL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }35HKgqX  
     bProcessed=TRUE; TD6MP9L  
    } si,W.9rU  
   } SO8b~N  
  } %5rC`9^  
  else if((lParam&0xc000ffff)==1){ //Key down  bMDj+i  
   switch(wParam) Xm I63W*  
   { Y2 QX9RN  
    case VK_MENU: 04}" n  
     MaskBits|=ALTBIT; H;k-@J  
     break; 9S! 2r  
    case VK_CONTROL: 5 4vDP9  
     MaskBits|=CTRLBIT; '~;vp  
     break; S :%SarhBD  
    case VK_SHIFT: na-mh E,H  
     MaskBits|=SHIFTBIT; p6|RV(?8  
     break; p8_ CY[U  
    default: //judge the key and send message /KLs+^c5  
     break; 9n!IdqKN  
   } C[IY9s:Pf  
   for(int index=0;index<MAX_KEY;index++) k%2Rv4)hU  
   { 2GW.'\D  
    if(hCallWnd[index]==NULL) OHyBNJ  
     continue; t IO 'ky  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ai@hQJ*  
    { l?J|Ip2W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bUS"1Tg]*6  
     bProcessed=TRUE; wN^$8m5\T^  
    } V+- ]txu|  
   } ,'z=cB`+o  
  } eR*y<K(d  
  if(!bProcessed){ Aat-938FP6  
   for(int index=0;index<MAX_KEY;index++){ b@  S.  
    if(hCallWnd[index]==NULL) Z`{ZV5  
     continue; %K7wScz7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .!Qo+(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); p"ElO,\  
   } ed:[^#Lj  
  } hQPNxpe  
 } +204.Yj?D  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); MF]EX  
} V<W$ h`  
nr>Os@\BU  
BOOL InitHotkey() @?YO_</  
{ 3,[#%}1(S  
 if(hHook!=NULL){ 2B`#c}PP  
  nHookCount++; 6&KvT2?tA`  
  return TRUE; :$5$H  
 } 1$1[6 \3v  
 else 22_%u=p-|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Q( g&/O  
  if(hHook!=NULL) m\xlSNW'q  
   nHookCount++; s6+`cC4  
  return (hHook!=NULL); ?@LqrKj 11  
} \2huDNW& !  
BOOL UnInit() X^c2  
{ #Rx|oSc}  
 if(nHookCount>1){ iwS55o  
  nHookCount--; q[Ed6FM$~  
  return TRUE; c3]X#Qa#m$  
 } 7ElU5I<S  
 BOOL unhooked = UnhookWindowsHookEx(hHook); I {&8iUN  
 if(unhooked==TRUE){ WPbG3FrL!  
  nHookCount=0; >J,y1jzJ  
  hHook=NULL; \Uh$%#}.  
 } GO<,zOqvU  
 return unhooked; ~;uc@GGo  
} m2h@*  
*%;+3SV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A1uo@W  
{ `Eq~W@';Q0  
 BOOL bAdded=FALSE; MeMSF8zSQ  
 for(int index=0;index<MAX_KEY;index++){ NPY\ >pf  
  if(hCallWnd[index]==0){ f&ri=VJY\T  
   hCallWnd[index]=hWnd; U2TR>0l  
   HotKey[index]=cKey;  VsR8|Hn$  
   HotKeyMask[index]=cMask; L^><APlX  
   bAdded=TRUE; DJ.n8hne  
   KeyCount++; M>LgEc-v67  
   break; Vq>$ZlvS  
  } ;I@@PUnR  
 } h#o?O k  
 return bAdded; \[yg f6#[  
} DLBHZ?+!  
C0v1x=(xiM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (#?k|e"Y"`  
{ X+LG Z4]D  
 BOOL bRemoved=FALSE; R m^$Dn  
 for(int index=0;index<MAX_KEY;index++){ 5@&{%99  
  if(hCallWnd[index]==hWnd){ & Y Y^Bd#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !wNj;ST*  
    hCallWnd[index]=NULL; 'wm :Xa  
    HotKey[index]=0; M`u&-6  
    HotKeyMask[index]=0; !eE;MaS>  
    bRemoved=TRUE; ?vn9HhTD  
    KeyCount--; U?.cbB,  
    break; i0/RvrLc  
   } _G0_<WH6  
  } !${7)=|=1  
 } !]*Cwbh. u  
 return bRemoved; ?=#vp /  
} o +KDK{MD  
pB0p?D)n  
void VerifyWindow() O~~WP*N  
{ RF$2p4=[  
 for(int i=0;i<MAX_KEY;i++){ |X6/Y@N  
  if(hCallWnd!=NULL){ vv0+F6 @  
   if(!IsWindow(hCallWnd)){ Nt'6Y;m!  
    hCallWnd=NULL; ,C97|6rC  
    HotKey=0; Md[M}d8  
    HotKeyMask=0; jqv"8S5  
    KeyCount--; MFzJ 8^.1R  
   } b;k3B7<  
  } R.'-jvO  
 } h}$g}f%$+  
} :)=>,XwL8  
R;l;;dC=  
BOOL CHookApp::InitInstance() l\t\DX"s_  
{ -'%>Fon  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); F)n^pT  
 hins=AfxGetInstanceHandle(); g:rjt1w`D  
 InitHotkey(); F :p9y_W  
 return CWinApp::InitInstance(); =&~7Q"  
} 9S_PZH  
vOQ 3A%/  
int CHookApp::ExitInstance() :/<SJ({q  
{ orON)S ks  
 VerifyWindow(); qSA]61U&  
 UnInit(); l.nd Wv  
 return CWinApp::ExitInstance(); o7i>D6^^  
} 'nRoa7v(  
0* ^>/*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file EJ@&vuDd$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) J1UG},-h  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ iKM!>Fi  
#if _MSC_VER > 1000 #AO?<L  
#pragma once 0(|Yy/Yq  
#endif // _MSC_VER > 1000 rHaj~s 4  
dn1Fwy.  
class CCaptureDlg : public CDialog ?%A9}"q]  
{ ;Y9-0W  
 // Construction ?[VL 2dP0  
 public: YM r2|VEU[  
  BOOL bTray;  ,7h0y  
  BOOL bRegistered; "zZ Z h  
  BOOL RegisterHotkey(); bGtS! 'I  
  UCHAR cKey; H~:EPFi.(  
  UCHAR cMask; N5d)&a 7?  
  void DeleteIcon(); gzd<D}2F~  
  void AddIcon(); Kg6[  
  UINT nCount; e%_J O7  
  void SaveBmp(); OaeX:r+&Q  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor AEd]nVV Q  
  // Dialog Data ?RQ_LA;  
  //{{AFX_DATA(CCaptureDlg) |5TzRz  
  enum { IDD = IDD_CAPTURE_DIALOG }; NpLZ ,|H  
  CComboBox m_Key; G nPrwDB  
  BOOL m_bControl; m"/ o4  
  BOOL m_bAlt; L.?QZN%cN  
  BOOL m_bShift; ;V0^uB.z  
  CString m_Path; W"n0x8~sV  
  CString m_Number; <q.Q,_cW  
  //}}AFX_DATA ?>/9ae^Bw  
  // ClassWizard generated virtual function overrides 7SJR_G6,{  
  //{{AFX_VIRTUAL(CCaptureDlg) Z_;! f}X  
 public: 8}K^o>J&K  
  virtual BOOL PreTranslateMessage(MSG* pMsg); CuT50N;tk  
 protected: 38#Zlc f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8_Nyy/K#F  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); of=N+ W  
  //}}AFX_VIRTUAL o]M1$)>b +  
  // Implementation lc[)O3,,B  
 protected: (L<q Jd1Q  
  HICON m_hIcon; /*2)|2w  
  // Generated message map functions IqAML|C  
  //{{AFX_MSG(CCaptureDlg) [9^lAhX  
  virtual BOOL OnInitDialog(); ("KtJ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Bwl@Muw  
  afx_msg void OnPaint(); 6UKZ0~R  
  afx_msg HCURSOR OnQueryDragIcon(); Jo''yrJpB  
  virtual void OnCancel(); Ji4JP0  
  afx_msg void OnAbout(); {n\Ai3F-  
  afx_msg void OnBrowse(); f]48-X,^6  
  afx_msg void OnChange(); 43?uTnX/  
 //}}AFX_MSG M;LR$'cP  
 DECLARE_MESSAGE_MAP() @1N .;]|  
}; =}g-N)^  
#endif mg]t)+PQ  
!nU|3S[b  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4;*jE (  
#include "stdafx.h" HtV8=.^  
#include "Capture.h" N 9W,p 2  
#include "CaptureDlg.h" fSVb.MZa7  
#include <windowsx.h> _9C,N2a{C  
#pragma comment(lib,"hook.lib") B~B,L*kC2  
#ifdef _DEBUG 0b G#'.-  
#define new DEBUG_NEW 8b!xMFF"  
#undef THIS_FILE AO238RC!:  
static char THIS_FILE[] = __FILE__; <?F-v  
#endif UC_o;  
#define IDM_SHELL WM_USER+1 Ggry,3X3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =P%?{7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;pj,U!{%s\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -}u1ZEND  
class CAboutDlg : public CDialog " GY3sam  
{ !bs5w_@  
 public: [/o B jiBA  
  CAboutDlg(); 8]mRX~  
  // Dialog Data B$M4f7  
  //{{AFX_DATA(CAboutDlg) 6UI6E)g  
  enum { IDD = IDD_ABOUTBOX }; :%_h'9Qq  
  //}}AFX_DATA y$+=>p|d.^  
  // ClassWizard generated virtual function overrides  SQ&}18Z~  
  //{{AFX_VIRTUAL(CAboutDlg) D"gv:RojD  
 protected: C8W_f( i~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xXlx}C  
  //}}AFX_VIRTUAL `S+n,,l  
  // Implementation iJH?Z,Tjf  
 protected: g/frg(KF  
  //{{AFX_MSG(CAboutDlg) ;nrkC\SYh:  
  //}}AFX_MSG Z((e-T#,  
  DECLARE_MESSAGE_MAP() 5"y)<VLJX  
}; A4g,)  
g:Q:cSg<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {n&GZG"f  
{ Id1de>:;  
 //{{AFX_DATA_INIT(CAboutDlg) orOq5?3  
 //}}AFX_DATA_INIT EU Z7?4o  
} fA"c9(>m%]  
Q zg?#|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Hy5 6@jW+E  
{ 6LrI,d  
 CDialog::DoDataExchange(pDX); ;d<O/y,:4  
 //{{AFX_DATA_MAP(CAboutDlg) Z;S)GUG^  
 //}}AFX_DATA_MAP "~S2XcR[ E  
} 0{ _6le]  
'P*OzZ4>$  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) A'$>~Ev  
 //{{AFX_MSG_MAP(CAboutDlg) znDpg{U(  
 // No message handlers Jd~Mq9(  
 //}}AFX_MSG_MAP jGoQXiX  
END_MESSAGE_MAP() \x:} |   
H_,4N_hL  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B2Rpd &[  
: CDialog(CCaptureDlg::IDD, pParent) fw VI%0C@  
{ y|=KrvMHJ  
 //{{AFX_DATA_INIT(CCaptureDlg) R;pIi/yDRe  
  m_bControl = FALSE; BNe>Lko  
  m_bAlt = FALSE; ~^'WHuz Py  
  m_bShift = FALSE; ?gBFfi  
  m_Path = _T("c:\\"); ~k%XW$cV  
  m_Number = _T("0 picture captured."); ayh235>a(  
  nCount=0; Vw3=jIQN:!  
  bRegistered=FALSE; .K1wp G[4  
  bTray=FALSE; FY-eoq0O3  
 //}}AFX_DATA_INIT /E3~z0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -?l`LbD  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @-Y,9mM   
} =dwy 4  
"&{.g1i9  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6J_$dzw  
{ ZuZCIqN  
 CDialog::DoDataExchange(pDX); 0dQ\Y]b  
 //{{AFX_DATA_MAP(CCaptureDlg) Z?d][zGw  
  DDX_Control(pDX, IDC_KEY, m_Key); c[T@lz(!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); !@*= b1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .s?^y+e_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); OO'zIC<z  
  DDX_Text(pDX, IDC_PATH, m_Path); Jz*A!Li  
  DDX_Text(pDX, IDC_NUMBER, m_Number); OI8}v  
 //}}AFX_DATA_MAP #2lvRJB  
} u/NcX  
_k;HhLj`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) u%6b|M@P  
//{{AFX_MSG_MAP(CCaptureDlg) $Yp.BE<}  
 ON_WM_SYSCOMMAND() -r]L MQ  
 ON_WM_PAINT() |lk:(~DM  
 ON_WM_QUERYDRAGICON() dt>9mF q  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) \ .+:yV<$  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;)SWwhQ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Bj"fUI!dK  
//}}AFX_MSG_MAP -%Ce  
END_MESSAGE_MAP() =d iGuI B  
rg=Ym.  
BOOL CCaptureDlg::OnInitDialog() K`j:F>b  
{ $~j9{*]5  
 CDialog::OnInitDialog(); 6'x3g2C/  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); g3yZi7b5FU  
 ASSERT(IDM_ABOUTBOX < 0xF000); Gm3`/!r  
 CMenu* pSysMenu = GetSystemMenu(FALSE); I[?bM-  
 if (pSysMenu != NULL) o9yUJ@ :i  
 { j,SZJ{ebXg  
  CString strAboutMenu; gIIF17|Z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 7TU xdI  
  if (!strAboutMenu.IsEmpty()) 1 .[OS  
  { B9Wd '  
   pSysMenu->AppendMenu(MF_SEPARATOR); 6.$z!~8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .,U4 ATO  
  } G1*,~1i  
 } w~jm0jK]  
 SetIcon(m_hIcon, TRUE); // Set big icon [@B!N+P5;  
 SetIcon(m_hIcon, FALSE); // Set small icon c.5u \ I9"  
 m_Key.SetCurSel(0); \rO!lvX  
 RegisterHotkey(); +\u\BJ!LAJ  
 CMenu* pMenu=GetSystemMenu(FALSE); f! )yE`4-  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 'i:lV'  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 86!$<!I  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $ER9u2  
 return TRUE; // return TRUE unless you set the focus to a control F-M)6&T  
} 'H4?V  
B2KBJ4rI[1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) FFe{=H,=  
{ J\p-5[E  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "q!*RO'a  
 { l8 $.k5X  
  CAboutDlg dlgAbout; \qlz<   
  dlgAbout.DoModal(); vlipB}  
 } c/:k|x  
 else ZG{#CC=  
 { O3%#Q3c>3  
  CDialog::OnSysCommand(nID, lParam); fZLAZMrM  
 } 8<32(D{  
} E1`_[=8a9  
R~|(]#com  
void CCaptureDlg::OnPaint() ${}9/(x/^  
{ 2- (}=N  
 if (IsIconic())  B@*!>R  
 { :#{0yno)H  
  CPaintDC dc(this); // device context for painting Iz;^D!  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Q`Q"p  
  // Center icon in client rectangle `*`ZgTV  
  int cxIcon = GetSystemMetrics(SM_CXICON); #l.s> B4  
  int cyIcon = GetSystemMetrics(SM_CYICON); OECVExb@eH  
  CRect rect; yu > ;m.e_  
  GetClientRect(&rect); J!dv"Ww"  
  int x = (rect.Width() - cxIcon + 1) / 2; rusYNb1J  
  int y = (rect.Height() - cyIcon + 1) / 2; -w8?Ur1x:  
  // Draw the icon j~>J?w9<O  
  dc.DrawIcon(x, y, m_hIcon); fY #Yn  
 } JsMN_%y?  
 else }jU)s{>fb  
 { .cx9+;  
  CDialog::OnPaint(); P"t Dq&  
 } Snp(&TD<<  
} t]iKU@3  
}<w9Jfr"X  
HCURSOR CCaptureDlg::OnQueryDragIcon() %qqeL   
{ tB4yj_ZF  
 return (HCURSOR) m_hIcon; qPJSVo  
} %K06owV(S)  
+Jn\`4/J:  
void CCaptureDlg::OnCancel() 0ia-D`^me  
{ v6E5#pse8  
 if(bTray) g:U -kK!i  
  DeleteIcon(); yS[HYq  
  CDialog::OnCancel(); Ij XxH]2  
} ,_D@ggL-  
)7Qp9Fxo  
void CCaptureDlg::OnAbout() /11CC \  
{ q|IU+r:! 3  
 CAboutDlg dlg; ~Ga{=OM??  
 dlg.DoModal(); N=~DSsw  
} `Hv"^o  
]"YXa~b  
void CCaptureDlg::OnBrowse() ?P#\ CW  
{ qg<Y^ y  
 CString str; jHA(mU)b  
 BROWSEINFO bi; HqV4!o9'  
 char name[MAX_PATH]; olXfR-2>1  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |  >yc|W  
 bi.hwndOwner=GetSafeHwnd(); 9}42s+  
 bi.pszDisplayName=name; ljz=u;O)  
 bi.lpszTitle="Select folder"; EU'rdG*t/R  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; k)y<iHR_o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6Bexwf<u  
 if(idl==NULL) nrXKS&6  
  return; -lq`EB +  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); YB^m!A),I[  
 str.ReleaseBuffer(); 6lkCLH  
 m_Path=str; 'P4V_VMK  
 if(str.GetAt(str.GetLength()-1)!='\\') 9i{(GO  
  m_Path+="\\"; :b_hF  
 UpdateData(FALSE); pL>Yx>  
} osLEH?iKW  
qF`]}7"^  
void CCaptureDlg::SaveBmp() i~M-V=Zg  
{ <'A-9y]-v  
 CDC dc; +Mn(s36f2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); s.KfMJ"u[  
 CBitmap bm; vkM_a}%<  
 int Width=GetSystemMetrics(SM_CXSCREEN); Rt5Xqz\6i  
 int Height=GetSystemMetrics(SM_CYSCREEN); >%n6n! "  
 bm.CreateCompatibleBitmap(&dc,Width,Height); "+ k}#<P4\  
 CDC tdc; fi&>;0?7  
 tdc.CreateCompatibleDC(&dc); i1]}Q$  
 CBitmap*pOld=tdc.SelectObject(&bm); 62G %.'7  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); RQ#9[6w!v  
 tdc.SelectObject(pOld); iV\*7  
 BITMAP btm; - ku8n%u  
 bm.GetBitmap(&btm); yZNg[KH  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; o"A?Aq  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Fta=yH }  
 BITMAPINFOHEADER bih; o>m*e7l,  
 bih.biBitCount=btm.bmBitsPixel; U9 Q[K`  
 bih.biClrImportant=0; *7#5pT~  
 bih.biClrUsed=0; &XXr5ne~C  
 bih.biCompression=0; L&]{GNw  
 bih.biHeight=btm.bmHeight; Imyw-8/;  
 bih.biPlanes=1; _6YfPk+  
 bih.biSize=sizeof(BITMAPINFOHEADER); CwyE  8v  
 bih.biSizeImage=size; j<9^BNl  
 bih.biWidth=btm.bmWidth; *<?KOM  
 bih.biXPelsPerMeter=0; /;u=#qu(E-  
 bih.biYPelsPerMeter=0; gd]_OY7L  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N f}ZG  
 static int filecount=0; vAOThj)  
 CString name; Wkr31Du\K  
 name.Format("pict%04d.bmp",filecount++); Vy c  
 name=m_Path+name; qS ggZ0*  
 BITMAPFILEHEADER bfh; PfhKomt"  
 bfh.bfReserved1=bfh.bfReserved2=0; "{~^EQq,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); J'L6^-gV  
 bfh.bfSize=54+size; SaRn>n\  
 bfh.bfOffBits=54; ,XN4Iy#BZl  
 CFile bf; vo~Qo;m  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ w7\ \m9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); N%=,S?b  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); >{Xyl):  
  bf.WriteHuge(lpData,size); @B?'Mu*  
  bf.Close(); tdp>vI!  
  nCount++; /L2.7`5  
 } &k`lb kq  
 GlobalFreePtr(lpData); EYn9l n_]u  
 if(nCount==1) v`@N R06  
  m_Number.Format("%d picture captured.",nCount); A-M6MW  
 else 'mF&`BN}b  
  m_Number.Format("%d pictures captured.",nCount); *w6F0>u  
  UpdateData(FALSE); o+- 0`!yj  
} SWT)M1O2  
\vpX6!T  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) f>Tn#OW  
{ muhu` k`C  
 if(pMsg -> message == WM_KEYDOWN) ndk~(ex|j  
 { wawJZ+V  
  if(pMsg -> wParam == VK_ESCAPE) lt\Bm<"z!1  
   return TRUE; &F'n >QT9q  
  if(pMsg -> wParam == VK_RETURN) M`)3(|4  
   return TRUE; EQ"+G[j~x  
 } Z8f?uF  
 return CDialog::PreTranslateMessage(pMsg); zP|^@Homk  
} r*FAUb`bG  
\(zUI  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {T0Au{88H  
{ lj+&3<E  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 'HL.W](  
  SaveBmp(); $wl_  
  return FALSE; )t2eg1a:  
} c;n\HYk  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3,Iu!KB  
 CMenu pop; Odw9]`,T  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }1.'2.<Y  
 CMenu*pMenu=pop.GetSubMenu(0); ~;t/VsgGW  
 pMenu->SetDefaultItem(ID_EXITICON); ^5k~ 7F.  
 CPoint pt; )d{fDwrx1  
 GetCursorPos(&pt); Nkn2\ w  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); #TB 3|=  
 if(id==ID_EXITICON) /#?! 9c  
  DeleteIcon(); o Z%oP V:  
 else if(id==ID_EXIT) Pa?C-Xn^  
  OnCancel(); MaF4lFmS  
 return FALSE; CWb*bw0  
} /HdjPxH  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); fW=eB'Sl  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7IrH(~Fo  
 AddIcon(); 3A.lS+P1  
 return res; :+8qtIytKX  
} {?r5~ T`2  
Sj v iH  
void CCaptureDlg::AddIcon()  e `K{  
{ +{%)}?F  
 NOTIFYICONDATA data; yMpZ-b$*~  
 data.cbSize=sizeof(NOTIFYICONDATA); \86NV="U  
 CString tip; ROO@EQ#`Z  
 tip.LoadString(IDS_ICONTIP); VWk{?*Dp  
 data.hIcon=GetIcon(0); f`[E^ zj  
 data.hWnd=GetSafeHwnd(); iAt&927  
 strcpy(data.szTip,tip); p ^)3p5w  
 data.uCallbackMessage=IDM_SHELL; q-/t?m0  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; s'BlFB n  
 data.uID=98; , hp8b$  
 Shell_NotifyIcon(NIM_ADD,&data); l4U  
 ShowWindow(SW_HIDE); c/l^;6O/!\  
 bTray=TRUE; \4O_@d`A  
} <driD'=F  
Tz&h[+6`  
void CCaptureDlg::DeleteIcon() v]}\Ns/  
{ YhP+{Y8t  
 NOTIFYICONDATA data;  _ Ewkb  
 data.cbSize=sizeof(NOTIFYICONDATA); s|k&@jH)  
 data.hWnd=GetSafeHwnd(); TK0W=&6#A  
 data.uID=98; OMBH[_  
 Shell_NotifyIcon(NIM_DELETE,&data); x }]"jj2x  
 ShowWindow(SW_SHOW); D J7U6{KLq  
 SetForegroundWindow(); s? 2ikJq  
 ShowWindow(SW_SHOWNORMAL);  hV fANbs  
 bTray=FALSE; @E>I<j,D  
} =VV><^uzdY  
K{ntl-D&y  
void CCaptureDlg::OnChange() /. >%IcK  
{ Z,V<&9a;  
 RegisterHotkey(); K87yQOjPv  
} F?qg?1v B|  
s(r4m/  
BOOL CCaptureDlg::RegisterHotkey() KxWm63"  
{ -&lD0p>*g  
 UpdateData(); }L=Qp=4  
 UCHAR mask=0; }hcY5E-n  
 UCHAR key=0; o4agaA3k  
 if(m_bControl) 2WE01D9O  
  mask|=4; M(n@ytz  
 if(m_bAlt) MSB/O.  
  mask|=2; p =-~qBw  
 if(m_bShift) IsDwa qd|  
  mask|=1; ]<S{3F=  
  key=Key_Table[m_Key.GetCurSel()]; oc#hAjB.  
 if(bRegistered){ b.RFvq5Z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); S 8)!70  
  bRegistered=FALSE; ?%n"{k?#  
 } oVW>PEgB-  
 cMask=mask; .Ad9(s  
 cKey=key; -lR7 @S  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); {BgJ=0g?  
 return bRegistered; yJ ;Qe_up  
} $#(j2sL1  
o'8nQ Tao  
  四、小结 .hnq>R\  
p6ryUJc6  
  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