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
  • 6234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: yWmrdvL  
  wA1Ey:q  
  一、实现方法 0}D-KvjyP  
HoL~j({  
  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: y:C)%cv}*  
L9$&-A9ix  
#pragma data_seg("shareddata") $)f"K  
HHOOK hHook =NULL; //钩子句柄 i0b.AA  
UINT nHookCount =0; //挂接的程序数目 !YY 6o V  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 {dBB{.hX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^8Z@^M&O"  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey uct=i1+ fE  
static int KeyCount =0; y]7%$* <  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 jQ)L pjS1  
#pragma data_seg() re/xs~  
/Bh>  
  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。 HS(U4   
OelU D/[$  
  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: G"{4'LlA  
[.ey_}X8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 2'Y{FY_Z  
cKey,UCHAR cMask) nPcxknl(pd  
{ a^(2q{*  
 BOOL bAdded=FALSE; ^glX1 )  
 for(int index=0;index<MAX_KEY;index++){ {N "*olx  
  if(hCallWnd[index]==0){ 9lKRL'QR  
   hCallWnd[index]=hWnd; }|SIHz!R  
   HotKey[index]=cKey; "% SX@  
   HotKeyMask[index]=cMask;  w"BIv9N  
   bAdded=TRUE; t@6w$5:}  
   KeyCount++; C/bxfp{?  
   break; PP],HB+*[  
  } b]"2 VN  
 } }#&~w 0P  
 return bAdded; ma1 (EJ/  
} eVrnVPkM  
//删除热键 }iMXXXBOT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) El{r$-}  
{ xUIvLH=  
 BOOL bRemoved=FALSE; gt~9"I  
 for(int index=0;index<MAX_KEY;index++){ e~3]/BL  
  if(hCallWnd[index]==hWnd){ @`5QG2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |^ ?`Q.|c$  
    hCallWnd[index]=NULL; <>VID E  
    HotKey[index]=0; Qg[heND  
    HotKeyMask[index]=0; b$dBV}0 L  
    bRemoved=TRUE;  8>ESD}(  
    KeyCount--; >B`Cch/ 'U  
    break; t?KUK>>w  
   } zf`5>h|  
  } - Sx0qi'%  
 } 1]Gf)|  
 return bRemoved; o T:j:n  
} h,]tQ#!s8  
z/)$D  
tc"T}huypU  
  DLL中的钩子函数如下: )ni"qv~J  
q)NXyy4BT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) DQ%`v =  
{ E1#H{)G  
 BOOL bProcessed=FALSE; K4_~ruhr  
 if(HC_ACTION==nCode) Wa(W&]  
 { c$.UE  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9z+vFk`  
   switch(wParam) vz- 9<w;>a  
   {  Ob7zu"zr  
    case VK_MENU: tsck|;v  
     MaskBits&=~ALTBIT; 1X[ 73  
     break; Ad^dF'SN  
    case VK_CONTROL: zMbfV%b  
     MaskBits&=~CTRLBIT; UP}feN  
     break; 3(MoXA*  
    case VK_SHIFT: *@CVYJ'<  
     MaskBits&=~SHIFTBIT; ?){0-A4  
     break; fDL3:%D  
    default: //judge the key and send message H3!,d`D.N  
     break; ~(stA3]k  
   } u.$Ym  
   for(int index=0;index<MAX_KEY;index++){ 3xRM 1GgO  
    if(hCallWnd[index]==NULL) mp!YNI  
     continue; < }<#W/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qi( &8in  
    { XAw2X;F%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); lQ+Ru8I  
     bProcessed=TRUE; sq6>DuBZz  
    } 7F,07\c  
   } ^cB49s+{e  
  } ixIh T  
  else if((lParam&0xc000ffff)==1){ //有键按下 )ZQHa7V  
   switch(wParam) 2r %>]y  
   { 9 aY'0wa  
    case VK_MENU: 65'`uuPx  
     MaskBits|=ALTBIT; 8FAT(f//.  
     break; ^!q 08`0  
    case VK_CONTROL: r5D jCV"  
     MaskBits|=CTRLBIT;  -PcS(  
     break; s[Y)d>~\$=  
    case VK_SHIFT: mYntU^4f  
     MaskBits|=SHIFTBIT; _TtX`b_Z  
     break; mfj4`3:NV  
    default: //judge the key and send message lq;  
     break; KX0<j  
   } mk#>Dpy?  
   for(int index=0;index<MAX_KEY;index++){ gmXy>{T  
    if(hCallWnd[index]==NULL) vEu Ka<5  
     continue; xylpiSJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) es. jh  
    { Kl4isGcr]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); P]|J?$1K  
     bProcessed=TRUE; 2b; rr  
    } CW.&Y?>Tv  
   } V*~1,6N [  
  } ,h3269$J  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 v]B0!k&4.  
   for(int index=0;index<MAX_KEY;index++){ jVLY!7Z4  
    if(hCallWnd[index]==NULL) ='7er.~\  
     continue; d\v$%0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) elN{7:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9 yh9HE  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 suA+8}o]  
   } :({-0&&_  
  } Ll008.#  
 } r~8D\_=s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q >Q:X3  
} jjJc1p0  
$KoPGgC[  
  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: *jYHd#UZx4  
|^YzFrc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &?P=arU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .}IK}A/-  
>+yqjXRzm  
  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: \pjRv  
Fg_?!zR>6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9V|E1-")E  
{ 1~["{u  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) aO~s i=  
 { L~@ma(TV{K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 v[0DE*p  
  SaveBmp(); E"Ya-8d=  
  return FALSE; Xjs21-t%  
 } ^L>MZA ?  
 …… //其它处理及默认处理 #Tr;JAzVjG  
} J xA^DH  
#pS]k<o%1  
xI=}z  
  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。 $sU5=,  
utYnaeQcn  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 P5'iYahCq_  
6Cz7A  
  二、编程步骤 t/l!KdY$  
5*s1qA0^  
  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"; sN} s61  
O"_erH\nk  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 2rK-X_}  
!^c:'I>~  
  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; o|R*POM  
C><<0VhU  
  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; T0@](g  
W?*Xy6",JF  
  5、 添加代码,编译运行程序。  ET >S  
[@,OG-"&  
三、程序代码 8zP:*|D  
AzLbD2Pl  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 8m#}S\m  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3v8V*48B$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ F/Rng'l  
#if _MSC_VER > 1000 @-)<|orU4  
#pragma once \iFMU#  
#endif // _MSC_VER > 1000 &{-oA_@  
#ifndef __AFXWIN_H__ Q3<bC6$r  
#error include 'stdafx.h' before including this file for PCH ,!o\),N  
#endif an*]62l  
#include "resource.h" // main symbols QU-7Ch#8  
class CHookApp : public CWinApp 6%\7.h  
{ .ujs`9d_-  
 public: \_*?R,$3Y,  
  CHookApp(); uM6CG0  
  // Overrides &+)+5z_d  
  // ClassWizard generated virtual function overrides p9FA_(`^  
  //{{AFX_VIRTUAL(CHookApp) uE,i-g0$Id  
 public: v`[Tl  
  virtual BOOL InitInstance(); e67c:Z  
  virtual int ExitInstance(); Ns+)Y^(5  
  //}}AFX_VIRTUAL =yk Rki  
  //{{AFX_MSG(CHookApp) )64LKb$  
  // NOTE - the ClassWizard will add and remove member functions here. t*Z .e.q+  
  // DO NOT EDIT what you see in these blocks of generated code ! )bB"12Z|8  
  //}}AFX_MSG P#dG]NMf  
  DECLARE_MESSAGE_MAP() J8sJ~FnUj  
}; l _kg3e4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); N.fQ7z=Z(M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "e1{V8 4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OPvj{Dv$0  
BOOL InitHotkey(); d-6sC@PB  
BOOL UnInit(); 2ru*#Z#(  
#endif f7EIDFX>pt  
Zd[y+$>  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2.fyP"P L  
#include "stdafx.h" TIK/%T  
#include "hook.h" tJ?qcT?  
#include <windowsx.h> d&PE,$XC  
#ifdef _DEBUG VYl_U?D  
#define new DEBUG_NEW bqw/O`*wfN  
#undef THIS_FILE A&NC0K}G!  
static char THIS_FILE[] = __FILE__; I3}HNGvU  
#endif ]t. WJC %  
#define MAX_KEY 100 i# pjv'C  
#define CTRLBIT 0x04 &y#\1K  
#define ALTBIT 0x02 ^]#Ptoz^(l  
#define SHIFTBIT 0x01 (uuEjM$3%  
#pragma data_seg("shareddata") "VT{1(]t  
HHOOK hHook =NULL; Lu8%qcC  
UINT nHookCount =0; nhVK?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey &X#x9|=&O  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [M7iJcwt  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^D ]7pe  
static int KeyCount =0; 9[t]]  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \j2 : 6]Hm  
#pragma data_seg() U<ku_(2"#  
HINSTANCE hins; L337/8fh  
void VerifyWindow(); 7 SjF9x  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ;w>3,ub(0  
//{{AFX_MSG_MAP(CHookApp) .XV]<)<K$  
// NOTE - the ClassWizard will add and remove mapping macros here. dK0}% ]i3#  
// DO NOT EDIT what you see in these blocks of generated code! < '>d0:>N  
//}}AFX_MSG_MAP 7':5  
END_MESSAGE_MAP() 6SW|H"!!  
ND9 n1WZ&x  
CHookApp::CHookApp() _g^K$+F'}  
{ )H[h53bIq  
 // TODO: add construction code here, _H^^2#wc/  
 // Place all significant initialization in InitInstance 3oppV_^JdT  
} |!4B Wt  
s]nGpA[!  
CHookApp theApp; z{D$~ ob  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \28b_,i+  
{ bBeFL~  
 BOOL bProcessed=FALSE; I&'S2=s  
 if(HC_ACTION==nCode) KV^:sxU  
 { q_9N+-?{7  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;3.T* ?|o  
   switch(wParam) >0g `U  
   { a>)_ `m  
    case VK_MENU: W G3mQ\k  
     MaskBits&=~ALTBIT; dN$D6*  
     break; V:,3OLL*  
    case VK_CONTROL: %mB!|'K%  
     MaskBits&=~CTRLBIT; ;*>QG6Fh  
     break; 9:CVN@E  
    case VK_SHIFT: J]=aI>Ow  
     MaskBits&=~SHIFTBIT; c"%_]7  
     break; @mQ/W Ys  
    default: //judge the key and send message JhMrm%  
     break;  |(J ?#?  
   } $.r}g\43P  
   for(int index=0;index<MAX_KEY;index++){ 7N}\1Di5  
    if(hCallWnd[index]==NULL) q^jqLT&w  
     continue; (04j4teE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6S! lD=  
    { m5'__<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;:-2~z~~  
     bProcessed=TRUE; k"DQbUy0L  
    } WRLu 3nBx  
   } (zM+7tJH  
  } %~B)~|h  
  else if((lParam&0xc000ffff)==1){ //Key down Tg <>B  
   switch(wParam) QRg"/62WCD  
   { 4Rrw8Bw  
    case VK_MENU: 6,g5To#vw  
     MaskBits|=ALTBIT; r$3~bS$]  
     break; jziA;6uL  
    case VK_CONTROL: *s<dgFA'  
     MaskBits|=CTRLBIT; Vne. HFXA  
     break; 72 s$  
    case VK_SHIFT: +X%fcoc  
     MaskBits|=SHIFTBIT; K;ry4/Vap  
     break; ^;bGP.!p  
    default: //judge the key and send message ,h wf  
     break; pxCGE[@`  
   } I).^,%>Z)  
   for(int index=0;index<MAX_KEY;index++) wEo-a< (  
   { )K\k6HC.  
    if(hCallWnd[index]==NULL) P60]ps!M  
     continue; e $/Zb`k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qN`]*baS  
    { 2\z`G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); eLt Cxe  
     bProcessed=TRUE; /k3n{ ?$/  
    } )qe$rD;N  
   }  a`h$lUb-  
  } ZAnO$pA  
  if(!bProcessed){ S{"6PXzb  
   for(int index=0;index<MAX_KEY;index++){ g*w-"%"O  
    if(hCallWnd[index]==NULL) -%/,j)VKD  
     continue; >ihe|WN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) qRP8dH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9TXm Z  
   } +}G>M=t::  
  } i/ O,`2  
 } P`IMvOs&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ++p& x{  
} G.q^Zd#.T  
Fb<\(#t  
BOOL InitHotkey() {7pE9R5  
{ M;RnH##W  
 if(hHook!=NULL){ L/ICFa.G  
  nHookCount++; S}xDB  
  return TRUE; P+zI9~N[  
 } <1'X)n&Kw$  
 else = VX<eV  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); @=zBF'<.9  
  if(hHook!=NULL) uy*x~v*I]  
   nHookCount++; -) v p&-  
  return (hHook!=NULL); B,VSFpPx  
} {;z L[AgCg  
BOOL UnInit() .+JP tL  
{ e,j? _p  
 if(nHookCount>1){ L&gEQDPgq|  
  nHookCount--; dXK~ Z:  
  return TRUE; W%jX-  
 } IDk:jO  
 BOOL unhooked = UnhookWindowsHookEx(hHook); TeN1\rA,  
 if(unhooked==TRUE){ Ci#5@Q9#w  
  nHookCount=0; C5lD Hw[CX  
  hHook=NULL; '`goy%Wd  
 } CK`3   
 return unhooked; WbDC  
} Kp=3\)&  
tL4]6u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %Ty {1'o  
{ fdH'z:Xao  
 BOOL bAdded=FALSE; RVKaqJ0e<  
 for(int index=0;index<MAX_KEY;index++){ [q+ 39  
  if(hCallWnd[index]==0){ !#|fuOWe  
   hCallWnd[index]=hWnd; X)R] a]1A  
   HotKey[index]=cKey; !\k#{ 1[!  
   HotKeyMask[index]=cMask; 4z 3$  
   bAdded=TRUE; I\4`90uBN  
   KeyCount++; X9`C2fyVd  
   break; :;#}9g9  
  } "}x70q'>S  
 } {^19.F  
 return bAdded; L!8?2 \5  
} 6pz:Lfd80  
m"m;(T{ v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h}:5hi Jw  
{ uu/7Ie  
 BOOL bRemoved=FALSE; 0@/E% T1c"  
 for(int index=0;index<MAX_KEY;index++){ m&z %kVsg]  
  if(hCallWnd[index]==hWnd){ Nwu Be:"@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xg5@;p  
    hCallWnd[index]=NULL; PQ#-.K  
    HotKey[index]=0; ,c %gwzU  
    HotKeyMask[index]=0; Q@.9wEAJ  
    bRemoved=TRUE; _.8]7f`*Gc  
    KeyCount--; SFPIr0 u  
    break; ;@-5lCvC(+  
   } /t6u"I~  
  } Hr,gV2n  
 } 0}C}\1  
 return bRemoved; (Gk]<`d#N  
} G@I_6c E  
x 3co?  
void VerifyWindow() _nFvM'`<  
{ 3$G25=eN  
 for(int i=0;i<MAX_KEY;i++){ 2F@<{v4  
  if(hCallWnd!=NULL){ 3LnyQ  
   if(!IsWindow(hCallWnd)){ 9l^  
    hCallWnd=NULL; S@2Jj>3D?  
    HotKey=0; NeZYchR  
    HotKeyMask=0; F4{. 7BT  
    KeyCount--; z)y(31K<1  
   } exN#!& ;  
  } { rJF)\2  
 } T`<k4ur  
} O*Pe [T5x'  
"&o@%){]  
BOOL CHookApp::InitInstance() Tu#k+f*s  
{ 0YRYCO$  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); _q4dgi z  
 hins=AfxGetInstanceHandle(); ]T$w7puaJ  
 InitHotkey(); QMpA~x_m  
 return CWinApp::InitInstance(); lfhKZX  
} ,ui'^8{gK  
WG=r? xE  
int CHookApp::ExitInstance() en6AAr:U}  
{ xfQ;5n  
 VerifyWindow(); ` Z V'7|  
 UnInit(); U5%]nT"[]  
 return CWinApp::ExitInstance(); t"Rf67  
} 5{f/H] P  
zw:b7B]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8$tpPOhzb  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]1$AAmQH  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ;8Q?`=a  
#if _MSC_VER > 1000 SL 5DWZ  
#pragma once JV{!Ukuyp+  
#endif // _MSC_VER > 1000 t7%Bv+Uo  
`X03Q[:q"[  
class CCaptureDlg : public CDialog uXa}<=O  
{ r<H^%##,w  
 // Construction R2f,a*>  
 public: I{UB!0H  
  BOOL bTray; 7ib<Cb>K  
  BOOL bRegistered; <.XoC?j  
  BOOL RegisterHotkey(); ,(?4T~  
  UCHAR cKey; AQGE(%X  
  UCHAR cMask; & b2(Y4  
  void DeleteIcon(); aVL%-Il}  
  void AddIcon(); xH-k~#  
  UINT nCount; 4KB?g7_*  
  void SaveBmp(); Mo r-$a8  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor J, U~ .c  
  // Dialog Data j-E>*N}-_  
  //{{AFX_DATA(CCaptureDlg) F<<H [,%0  
  enum { IDD = IDD_CAPTURE_DIALOG }; >(J!8*7  
  CComboBox m_Key; WoR**J?}w  
  BOOL m_bControl; XYVeHP!  
  BOOL m_bAlt; 62E(=l  
  BOOL m_bShift; itMc!bUQ  
  CString m_Path; G2k71{jK  
  CString m_Number; 2Ps `!Y5  
  //}}AFX_DATA &,|uTIs  
  // ClassWizard generated virtual function overrides {]N?DmF  
  //{{AFX_VIRTUAL(CCaptureDlg) mw.aavB  
 public: vv_?ip:t  
  virtual BOOL PreTranslateMessage(MSG* pMsg); r/:'}os;  
 protected: @TG~fJSA12  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I#e*,#'S  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Mi-9sW  
  //}}AFX_VIRTUAL EU~'n-  
  // Implementation (Gs g+c   
 protected: zOp"n\  
  HICON m_hIcon; S(xA}0]  
  // Generated message map functions i<![i5uAI  
  //{{AFX_MSG(CCaptureDlg) ]c+'SJQ  
  virtual BOOL OnInitDialog(); >u[ln@ l  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); </Lqk3S-!  
  afx_msg void OnPaint(); hZG{"O!2 s  
  afx_msg HCURSOR OnQueryDragIcon(); P3>2=qK"E(  
  virtual void OnCancel(); 0']M,iC/  
  afx_msg void OnAbout(); ^el:)$  
  afx_msg void OnBrowse(); I[C.iILL  
  afx_msg void OnChange(); }RK9Onh3G  
 //}}AFX_MSG V!!'S h  
 DECLARE_MESSAGE_MAP() Jc6 D^=  
}; 1 crjRbi  
#endif w| # 79,&  
9 f+7vCA  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file %QkvBg*  
#include "stdafx.h" ?os0JQVB  
#include "Capture.h" EaL+}/q&  
#include "CaptureDlg.h" P0<uF`87  
#include <windowsx.h> \hX^Cn=6  
#pragma comment(lib,"hook.lib") evP`&23tP  
#ifdef _DEBUG VW/1[?HG5  
#define new DEBUG_NEW >X,6  
#undef THIS_FILE IHfqW?  
static char THIS_FILE[] = __FILE__; % M:"Ai5:  
#endif JJO"\^,;~  
#define IDM_SHELL WM_USER+1 G_RK3E[FK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {QJ`.6Kt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Su^Z{ Ud`  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3e:y?hpeL  
class CAboutDlg : public CDialog i[ lH@fJm_  
{ O%{>Zo_<  
 public: 1uE[ %M  
  CAboutDlg(); }zi6F.  
  // Dialog Data (~4AG \  
  //{{AFX_DATA(CAboutDlg) =cY]cPO  
  enum { IDD = IDD_ABOUTBOX }; ~*Wb MA  
  //}}AFX_DATA H2p;J#cv@  
  // ClassWizard generated virtual function overrides .d,Zx  
  //{{AFX_VIRTUAL(CAboutDlg) To95WG7G  
 protected: 2Ev,dWV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +!wc(N[(2  
  //}}AFX_VIRTUAL xDS9gGr  
  // Implementation &v88x s  
 protected: b1"wQM9  
  //{{AFX_MSG(CAboutDlg) 0&@6NW&Mu  
  //}}AFX_MSG 48VsHqG  
  DECLARE_MESSAGE_MAP() vF 1$$7k  
}; ,$>Z= ~x*  
e V#H"fM  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) c{0?gt.  
{ sy?W\(x  
 //{{AFX_DATA_INIT(CAboutDlg) fC[gu$f][  
 //}}AFX_DATA_INIT CJ>=odK[  
} mbK$Wp#  
%G*D0pE  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3]Mx,u  
{ zjS<e XLs[  
 CDialog::DoDataExchange(pDX); t!$/r]XM h  
 //{{AFX_DATA_MAP(CAboutDlg) }K\_N]#6n  
 //}}AFX_DATA_MAP u-$AFSt  
} +iR ;D$w  
/ e,lD)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Hqk2W*UTl  
 //{{AFX_MSG_MAP(CAboutDlg) MmB-SR[>P  
 // No message handlers BN67o]*]<  
 //}}AFX_MSG_MAP =v}.sJ V?  
END_MESSAGE_MAP() <dZ{E7l  
'S\H% -  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 'lF|F+8   
: CDialog(CCaptureDlg::IDD, pParent) 6 s/O\A  
{ 3h>Ji1vV  
 //{{AFX_DATA_INIT(CCaptureDlg) -=Hr|AhE  
  m_bControl = FALSE; +( d2hSIF  
  m_bAlt = FALSE; Phczf  
  m_bShift = FALSE; g o@}r<B$  
  m_Path = _T("c:\\"); e# DAa  
  m_Number = _T("0 picture captured."); 0J" 3RTt  
  nCount=0; &W%TY:Da|  
  bRegistered=FALSE; _nt%&f  
  bTray=FALSE; cW2:D$Pe  
 //}}AFX_DATA_INIT ,$Mw/fA  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :d;5Q\C`  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2t'&7>Ys{  
} ,o`qB81  
RL%{VE  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) OkM>  
{  i.]}ooI  
 CDialog::DoDataExchange(pDX); &N#)(rQ1  
 //{{AFX_DATA_MAP(CCaptureDlg) ! ^W|;bq  
  DDX_Control(pDX, IDC_KEY, m_Key); }`X$ '  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); aVlHY E  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ?!ig/ufZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ,DjZDw  
  DDX_Text(pDX, IDC_PATH, m_Path); u'C4d6\wS  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .T7ciD  
 //}}AFX_DATA_MAP Kj7Osqu2bE  
} hH\(> 4l  
`@90b 4u  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) )xeVoAg  
//{{AFX_MSG_MAP(CCaptureDlg) 7hc(]8eP  
 ON_WM_SYSCOMMAND() BBDOjhik  
 ON_WM_PAINT() `u-}E9{  
 ON_WM_QUERYDRAGICON() n\ZFPXP  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 5"sF#Y&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ifkA3]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0-FbV,:;  
//}}AFX_MSG_MAP +RM3EvglDQ  
END_MESSAGE_MAP() mnePm{  
$T6<9cB@  
BOOL CCaptureDlg::OnInitDialog() >&TktQO_T  
{ T'XRl@  
 CDialog::OnInitDialog(); OCd[P1Y]  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); W^x[ma z  
 ASSERT(IDM_ABOUTBOX < 0xF000); @1pdyKK  
 CMenu* pSysMenu = GetSystemMenu(FALSE); B3D4fYQ  
 if (pSysMenu != NULL) J]%P fWV  
 { `U1"WcN  
  CString strAboutMenu; nL$tXm-x  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Au {`o xD  
  if (!strAboutMenu.IsEmpty()) 1yo@CaW[\  
  { P>H'od  
   pSysMenu->AppendMenu(MF_SEPARATOR); `yhL11 ]~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I|.B-$gH  
  } %w@(V([(c  
 } mb#)w`<  
 SetIcon(m_hIcon, TRUE); // Set big icon Yv{AoL~  
 SetIcon(m_hIcon, FALSE); // Set small icon (z[cf|he  
 m_Key.SetCurSel(0); :KFhryN  
 RegisterHotkey(); 4]cOTXk9C  
 CMenu* pMenu=GetSystemMenu(FALSE); DN!EsQ6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); T]:5y_4?[  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `s+qz  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); k";;Snk  
 return TRUE; // return TRUE unless you set the focus to a control dO=<3W  
} S SzOz-&GA  
6 @d( <Z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9SrV,~zD  
{ H=dj\Br`  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) /f#sg7)  
 { T57S!CJ^$5  
  CAboutDlg dlgAbout; 6V8"[0U  
  dlgAbout.DoModal(); :{sX8U%  
 } Mfgd;FsX#  
 else 7S Qu  
 { B!5gD   
  CDialog::OnSysCommand(nID, lParam); r4-r z+x  
 } jj^CW"IB  
} h_cZ&P|  
0I.7I#'3O  
void CCaptureDlg::OnPaint() Yrd K@I  
{ 1.uyu  
 if (IsIconic()) 1*a2s2G '  
 { w<'mV^S  
  CPaintDC dc(this); // device context for painting <"t >!I  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 'd28YjtoX  
  // Center icon in client rectangle rlds-j''  
  int cxIcon = GetSystemMetrics(SM_CXICON); $FAl9  
  int cyIcon = GetSystemMetrics(SM_CYICON); {u:DC4eut  
  CRect rect; hGpaHY>My  
  GetClientRect(&rect); v/kYyz  
  int x = (rect.Width() - cxIcon + 1) / 2; =.uE(L`]NA  
  int y = (rect.Height() - cyIcon + 1) / 2; }NUP[%  
  // Draw the icon 8T%z{A1T  
  dc.DrawIcon(x, y, m_hIcon); ~h1'_0t   
 } ]-O:|q>]  
 else L.8-nTg"y  
 { s)-=l _4T  
  CDialog::OnPaint(); <EE)d@%>v  
 } %9M_ * ]  
} WB= gN:?  
(j'[t  
HCURSOR CCaptureDlg::OnQueryDragIcon() .rS0zU  
{ E;+3VJ+F"  
 return (HCURSOR) m_hIcon; <$UY{"?  
} O|8p #  
rc"Z$qU?  
void CCaptureDlg::OnCancel() U#Ud~Q q  
{ t]Oxo`h=  
 if(bTray) kefQH\<X  
  DeleteIcon(); ?&N JN/+%  
  CDialog::OnCancel(); #vIF]Y  
} IQR?n}ce  
wc ^z9y  
void CCaptureDlg::OnAbout() 2"NJt9w  
{ ?gTY! ;$P  
 CAboutDlg dlg; c(@)V.o2  
 dlg.DoModal(); ^Zg"`&E  
} #wt#-U;  
7^ER?@:W  
void CCaptureDlg::OnBrowse() oJ5V^.  
{ "_9Dau$  
 CString str; &u.t5m7(  
 BROWSEINFO bi; x ;kW }U  
 char name[MAX_PATH]; O7E0{8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); { c]y<q  
 bi.hwndOwner=GetSafeHwnd(); H1N%uk=kV  
 bi.pszDisplayName=name; rR/PnVup  
 bi.lpszTitle="Select folder"; c$>Tfa'H  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Z5+qb  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); './s'!Lj  
 if(idl==NULL) TJ+yBMd*%  
  return; Lg-Sxz}P!  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @dw0oRF  
 str.ReleaseBuffer(); 'b%S3)}  
 m_Path=str; h\jwXMi,tj  
 if(str.GetAt(str.GetLength()-1)!='\\') d?'q(6&H  
  m_Path+="\\"; XO219   
 UpdateData(FALSE); YX- G>.Pc  
} 2b2/jzO}J  
hbn2(e;FZ  
void CCaptureDlg::SaveBmp() IRD?.K]*  
{ |LWG7 ZE  
 CDC dc; {8'I+-  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); iFpJ /L  
 CBitmap bm; .]P@{T||Y  
 int Width=GetSystemMetrics(SM_CXSCREEN); IE,xiV  
 int Height=GetSystemMetrics(SM_CYSCREEN); >=$( ,8"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 85m_jmh[  
 CDC tdc; tK0?9M.)  
 tdc.CreateCompatibleDC(&dc); V D-,)f  
 CBitmap*pOld=tdc.SelectObject(&bm); [$f  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Bh<)e5lP:  
 tdc.SelectObject(pOld); fsb_*sh&  
 BITMAP btm; usX aT(K  
 bm.GetBitmap(&btm); F~4oPB K<  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; BlMc<k  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); k\I+T~~xD  
 BITMAPINFOHEADER bih; n-0RA~5z  
 bih.biBitCount=btm.bmBitsPixel; Q`'w)aV  
 bih.biClrImportant=0; g"^<LX-  
 bih.biClrUsed=0; 6Xbo:#  
 bih.biCompression=0; $SA8$!:  
 bih.biHeight=btm.bmHeight; {p-&8-  
 bih.biPlanes=1; ^pIT,|myY7  
 bih.biSize=sizeof(BITMAPINFOHEADER); Xb.WI\Eh  
 bih.biSizeImage=size; w 7s+6,  
 bih.biWidth=btm.bmWidth; xmsw'\  
 bih.biXPelsPerMeter=0; hv2@}<r?  
 bih.biYPelsPerMeter=0; } U\n:@:2B  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (w `9*1NO  
 static int filecount=0; cl/}PmYIZ  
 CString name; G?v]p~6  
 name.Format("pict%04d.bmp",filecount++); |aIY  
 name=m_Path+name; ,p {|f}0  
 BITMAPFILEHEADER bfh; 9/'zk  
 bfh.bfReserved1=bfh.bfReserved2=0; 09HlL=0q  
 bfh.bfType=((WORD)('M'<< 8)|'B'); AQ7w5}g+V  
 bfh.bfSize=54+size; %dw@;IZ#8{  
 bfh.bfOffBits=54; fIWOo >)D  
 CFile bf; }\?UmuolQ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ EPkmBru ^  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <#k(g\/R  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); n j0!  
  bf.WriteHuge(lpData,size); T5$db-^  
  bf.Close(); %L,mj  
  nCount++; L/t'|<m  
 } iK%%  
 GlobalFreePtr(lpData); lpi^<LQ@l  
 if(nCount==1) jv_z%`  
  m_Number.Format("%d picture captured.",nCount); Rf9;jwU  
 else m:_'r"o  
  m_Number.Format("%d pictures captured.",nCount); AU0pJB'  
  UpdateData(FALSE); _[SW89zk  
} W"MwpV  
Te_%r9P|2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) > yk2  
{ ?%K7IJ%  
 if(pMsg -> message == WM_KEYDOWN) }]VFLBl`w  
 { #6* j+SX^  
  if(pMsg -> wParam == VK_ESCAPE) %PW_v~sg  
   return TRUE; 2)cq!Zv  
  if(pMsg -> wParam == VK_RETURN) *jE> (J`  
   return TRUE; Hwiw:lPq`E  
 } r~ N:|ip=  
 return CDialog::PreTranslateMessage(pMsg); mqUn3F3  
} !g=4\C`mY  
Jvac|rN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) S+9}W/  
{ 6N+]g/_a  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,sF49C D  
  SaveBmp(); l=4lhFG,Mk  
  return FALSE; 9 M>.9~  
} &![3{G"+>l  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^V,?n@c!  
 CMenu pop; JiH^N!  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); v{tw;Z#  
 CMenu*pMenu=pop.GetSubMenu(0); ~*NG~Kn"s  
 pMenu->SetDefaultItem(ID_EXITICON); #s% _ L  
 CPoint pt; &pCa{p  
 GetCursorPos(&pt); ePLpGT  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); iX (<ozH  
 if(id==ID_EXITICON) ZMa@/\pf1  
  DeleteIcon(); d%?$UnQ  
 else if(id==ID_EXIT) |0^~S  
  OnCancel(); EIdEXAC(  
 return FALSE; ' ?tx?t  
} ] 40@yrc  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); CmP_9M?ce  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Q^trKw~XNy  
 AddIcon(); rHngYcjR  
 return res; ?E +[  
} Fw.df<  
mQd L"caA  
void CCaptureDlg::AddIcon() z.Y`"B'j`  
{ K)DpC*j  
 NOTIFYICONDATA data; J> Z.2  
 data.cbSize=sizeof(NOTIFYICONDATA); !pT i.3  
 CString tip;  VB&` S+-  
 tip.LoadString(IDS_ICONTIP); 5TynAiSD_>  
 data.hIcon=GetIcon(0); 1|bg;X9+  
 data.hWnd=GetSafeHwnd(); <b>g^ `}?D  
 strcpy(data.szTip,tip); + PAb+E|,  
 data.uCallbackMessage=IDM_SHELL; ^L4"X~eM  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Rq`d I~5!b  
 data.uID=98; t nvCtuaR  
 Shell_NotifyIcon(NIM_ADD,&data); e)BU6m%  
 ShowWindow(SW_HIDE); ~S\y)l\wZ  
 bTray=TRUE; 6>Dm cG:.  
} 2UbTKN  
M1HGXdN*B  
void CCaptureDlg::DeleteIcon() "Sb<"$ :  
{ ,uo K'_  
 NOTIFYICONDATA data; -_[ZRf?^  
 data.cbSize=sizeof(NOTIFYICONDATA); U,Q  
 data.hWnd=GetSafeHwnd(); IEmjWw4  
 data.uID=98; 0#y i5U  
 Shell_NotifyIcon(NIM_DELETE,&data); &) qs0  
 ShowWindow(SW_SHOW); dQljG.PiK  
 SetForegroundWindow(); i U"2uLgb  
 ShowWindow(SW_SHOWNORMAL); e|1.-P@  
 bTray=FALSE; Ah :d2*SR4  
} [ikW3 '99,  
M4}b l h#  
void CCaptureDlg::OnChange() 5do49H_  
{ $Cnv]1%  
 RegisterHotkey(); X+7@8)1(  
} Qo\+FkhYq  
1[:tiTG|C  
BOOL CCaptureDlg::RegisterHotkey() rK~Obv  
{ IeN~ E'~  
 UpdateData(); )=TS)C4  
 UCHAR mask=0; j"5 $m@lgn  
 UCHAR key=0; JavSR1_  
 if(m_bControl) D;! aix3  
  mask|=4; Q@(tyW+8U@  
 if(m_bAlt) Q ym=L(X  
  mask|=2; ,z5B"o{Et  
 if(m_bShift) L S%;ZKJ  
  mask|=1; $97EeE:{M  
  key=Key_Table[m_Key.GetCurSel()]; q=x1:^rVH  
 if(bRegistered){ |SX31T9rG  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); S; Fj9\2)I  
  bRegistered=FALSE; B`w@Xk'D  
 } pq +~|  
 cMask=mask; wl5+VC*l0  
 cKey=key; "30R%oL]=  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); hqc)Ydg_%  
 return bRegistered; |C`.m |  
} H^fErl  
E}lNb  
  四、小结 A}W}H;8x  
6 K-jje;)  
  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
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八