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
  • 5454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: H'!OEZ  
  Ucy=I$"  
  一、实现方法 _UkBOJ:G$H  
[>p!*%m  
  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: ( EJ1g^|"  
;5\'PrE  
#pragma data_seg("shareddata") 0~$9z+S  
HHOOK hHook =NULL; //钩子句柄 DcaKGjp  
UINT nHookCount =0; //挂接的程序数目 LHZsmUM(dg  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 sxF2ku4A  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9 $X" D  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0$Mxu7 /  
static int KeyCount =0; Z7y%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ,Q Ge=Exn  
#pragma data_seg() Kg<~Uf=1  
R7z @y o  
  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。 N6_1iIM  
SFuSM/Pf  
  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: -t<1A8%  
(Lz|o!>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Q-R?y+| x  
cKey,UCHAR cMask) J7{D6@yLS  
{ o+}1M  
 BOOL bAdded=FALSE; X~o;jJC  
 for(int index=0;index<MAX_KEY;index++){ Gb[J3:.  
  if(hCallWnd[index]==0){ #G0'Q2  
   hCallWnd[index]=hWnd; 4`oKvL9  
   HotKey[index]=cKey; =(TMcu$4`  
   HotKeyMask[index]=cMask; 7vPG b:y  
   bAdded=TRUE; .HY,'oC.  
   KeyCount++; #Cs/.(<  
   break;  Y~^R^J  
  } $;ny`^8  
 } P;gd!Yl<-  
 return bAdded; {*hGe_^  
} pQ7elv]  
//删除热键 _hJ+8B^`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $d-yG553  
{ 94 6r#`q  
 BOOL bRemoved=FALSE; o\Fv~^  
 for(int index=0;index<MAX_KEY;index++){ 6A>bm{`c:  
  if(hCallWnd[index]==hWnd){ ,s}&|+ '"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ uInI{>  
    hCallWnd[index]=NULL; M{)eA<6  
    HotKey[index]=0; A\7sP =  
    HotKeyMask[index]=0; _f>)G3p  
    bRemoved=TRUE; QRl+7V  
    KeyCount--; d?YSVmG  
    break; K9ih(fh)  
   } dQp>z%L)  
  } vzSjfv  
 } >^#Liwm  
 return bRemoved; YT[=o}jS  
} ^oq|^O  
L?8OWLjRy  
DTi^* Wj  
  DLL中的钩子函数如下: vYLspZ;S  
?AxB0d9z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9'|k@i:  
{ *&_A4)  
 BOOL bProcessed=FALSE; l&W:t9o  
 if(HC_ACTION==nCode) 9w&CHg7D i  
 { dW5r]D[Cx  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 W>{&" 5  
   switch(wParam) >N`, 3;Z  
   {  c-.F {~  
    case VK_MENU: "[z/\l8O  
     MaskBits&=~ALTBIT; 3ErV" R4"$  
     break; N@'l: N'f4  
    case VK_CONTROL: <H<Aba9\  
     MaskBits&=~CTRLBIT; WyQ8}]1b  
     break; *j1Skd.#At  
    case VK_SHIFT: !](Mt?e  
     MaskBits&=~SHIFTBIT; Ty!V)i  
     break; J- l[dC  
    default: //judge the key and send message 2.{<C.BK{  
     break; =7:}/&  
   } hlc g[Qdo*  
   for(int index=0;index<MAX_KEY;index++){ fyx Q{J  
    if(hCallWnd[index]==NULL) NX;{L#lQ  
     continue; i8EKzW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w}07u5  
    { ~_ovQ4@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }p)a 7xn}  
     bProcessed=TRUE; yVPFH~1@\  
    } Bv*VNfUm  
   } %%wngiz\  
  } #t# S(A9)  
  else if((lParam&0xc000ffff)==1){ //有键按下 e cvZwL  
   switch(wParam) Y<@_d  
   { 0,__{?!  
    case VK_MENU: U&$I!80.  
     MaskBits|=ALTBIT; <A\g*ld  
     break; JiA1yt  
    case VK_CONTROL: >: @\SU  
     MaskBits|=CTRLBIT; s1%2({wP  
     break; [P)](8nR[  
    case VK_SHIFT: G[zysxd  
     MaskBits|=SHIFTBIT; mkBQ TQGT  
     break; .rDao]K  
    default: //judge the key and send message C<^S$  
     break; b3GTsX\2|  
   } 6is+\  
   for(int index=0;index<MAX_KEY;index++){ rg%m   
    if(hCallWnd[index]==NULL) D[YdPg@-  
     continue; FY+@fy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^:O*Sx.CA  
    { 7 X~JLvN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DuQ:82 3b  
     bProcessed=TRUE; X0$?$ ta  
    } $'a]lR  
   } +}-cvM/*  
  } FklO#+<:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2v*X^2+  
   for(int index=0;index<MAX_KEY;index++){ 1o   
    if(hCallWnd[index]==NULL) AMK3I`=8WO  
     continue; 2|M,#2E-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) to\$'2F"q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QX(t@VP  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 EScy!p\*  
   } f,-'eW/j  
  } cZt5;"xgr]  
 } D9r;Ys%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4tapQgj24  
} q| *nd!y'  
]zvOM^l~  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: T?-K}PUcQ  
7tY~8gQel  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); itO1ROmu  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <%`z:G3  
P[ Vf$ q<  
  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: `-rtU  
H[r64~Sth  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $T2zs$  
{ 1<M~ #  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6HVGqx  
 { %NL7XU[~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 P\ 2Bx *e  
  SaveBmp(); VF"c}  
  return FALSE; #Pq6q.UB  
 } <|a9r: [  
 …… //其它处理及默认处理 2l8z/o7v  
} -]Oi/i,{  
wS:`c J  
BUsAEw M  
  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。 J\I`#  
8O*O 5   
  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。 6lxZo_  
dSzq}w4xY  
  二、编程步骤 k0DX|O8mXV  
gLg\W3TOi  
  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"; d[ce3':z  
p*Hf<)}  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; C2J@]&  
%vrUk;<35  
  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; maQOU1  
T!5g:;~y >  
  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; .lppT)P  
^F/H?V/PX  
  5、 添加代码,编译运行程序。 ]G=^7O]`C!  
Fz_8m4  
三、程序代码 VDv>I 2%  
m] IN-'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL <UJ5n) }"\  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) &)Iue<&2  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5kj=Y]9\I  
#if _MSC_VER > 1000 C5#$NV99p  
#pragma once :Us NiR=l  
#endif // _MSC_VER > 1000 IAbH_+7O  
#ifndef __AFXWIN_H__ sVIw'W  
#error include 'stdafx.h' before including this file for PCH a^9}ceu?   
#endif &R}2/Mt  
#include "resource.h" // main symbols Z9PG7h  
class CHookApp : public CWinApp ]<E\J+5K  
{ k5GJrK+  
 public: `"E<%$|ZQy  
  CHookApp(); xTdh/}  
  // Overrides cU=EXyP%  
  // ClassWizard generated virtual function overrides HBgt!D0MZ  
  //{{AFX_VIRTUAL(CHookApp) :B4X/  
 public: QEq>zuz5;  
  virtual BOOL InitInstance(); ,W;2A0A?X  
  virtual int ExitInstance(); y8O<_VOO}"  
  //}}AFX_VIRTUAL locf6%2g~  
  //{{AFX_MSG(CHookApp) e%&/K7I"?  
  // NOTE - the ClassWizard will add and remove member functions here. ?|we.{  
  // DO NOT EDIT what you see in these blocks of generated code ! k%ckV`y  
  //}}AFX_MSG QPwUW  
  DECLARE_MESSAGE_MAP() H52] Zm  
}; 3sBu`R*hk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); >1d`G%KfG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,7|2K&C5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r;&rc:?A  
BOOL InitHotkey(); :mz6*0qW  
BOOL UnInit(); UR.l*+<W7  
#endif ~G`(=\_0  
5ayH5=(t  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. u+vUv~4A6  
#include "stdafx.h" IqmoWn3  
#include "hook.h" *.NVc  
#include <windowsx.h> k:kx=K5=4  
#ifdef _DEBUG 1C\[n(9  
#define new DEBUG_NEW <al/>7z' O  
#undef THIS_FILE FFqqAT5  
static char THIS_FILE[] = __FILE__; \*$''`b)j  
#endif #+Cu&l  
#define MAX_KEY 100 IG~d7rh"  
#define CTRLBIT 0x04 XQL]I$?  
#define ALTBIT 0x02 Ycve[31BDd  
#define SHIFTBIT 0x01 *b]$lj  
#pragma data_seg("shareddata") FQCz_ z  
HHOOK hHook =NULL; 2AI~Jm#  
UINT nHookCount =0; M2e_)f:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey C e1^S[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT yGtGhP8  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,XNz.+Ov  
static int KeyCount =0; ue{0X\[P<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift :Sd iG=t  
#pragma data_seg() ?Dk&5d^d  
HINSTANCE hins; x0_$,Tz@  
void VerifyWindow(); P mgTTI  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) sKI{AHJ?X  
//{{AFX_MSG_MAP(CHookApp) 3]1uDgfr  
// NOTE - the ClassWizard will add and remove mapping macros here. W-+~r  
// DO NOT EDIT what you see in these blocks of generated code!  \>*B  
//}}AFX_MSG_MAP bjEm=4FI;  
END_MESSAGE_MAP() &]Q\@;]Aq  
!r*Ogv[  
CHookApp::CHookApp() \sZ!F&a~  
{ xA>O4S D  
 // TODO: add construction code here, h*9s^`9)  
 // Place all significant initialization in InitInstance V/}g'_E  
} z<c@<M=Q*  
#^fDKM  
CHookApp theApp; `-L{J0xq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) h"{Z%XPX#  
{ \vvV=iw  
 BOOL bProcessed=FALSE; <Sx-Ca7  
 if(HC_ACTION==nCode) ?oX.$E?(  
 { )a%kAUNj  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2pEr s|r  
   switch(wParam) VUaYK  
   { }&OgIo+  
    case VK_MENU: k-&fPEjG  
     MaskBits&=~ALTBIT; h}o7/p  
     break; +5:oW~ ;  
    case VK_CONTROL: yY$:zc"J  
     MaskBits&=~CTRLBIT; co$I htOv  
     break; E/</  
    case VK_SHIFT: IMDGinHAy  
     MaskBits&=~SHIFTBIT; VMZ"i1rP  
     break; as?~N/}  
    default: //judge the key and send message ], HF) 21  
     break; q'%-8t  
   } ({}JvSn1  
   for(int index=0;index<MAX_KEY;index++){ b xT|  
    if(hCallWnd[index]==NULL) 2Po e-=  
     continue; #PpmR _IX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2.zx  
    { QFm~wv 8:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); q;p:)Q"  
     bProcessed=TRUE; VnB"0 "%w  
    } &v\  
   } ,dM}B-  
  } ,Mp/Y>f  
  else if((lParam&0xc000ffff)==1){ //Key down &nk[gb o\  
   switch(wParam) @3hA\3ot^  
   { pPNU0]/  
    case VK_MENU: Q^qdm5}UkW  
     MaskBits|=ALTBIT; {>E`Zf:  
     break; Rs<li\GS  
    case VK_CONTROL: ySLa4DQf  
     MaskBits|=CTRLBIT; :eIu<_,}  
     break; %\5d?;   
    case VK_SHIFT: {uQp$`  
     MaskBits|=SHIFTBIT; !vB8Pk"  
     break; n .{Ud\|  
    default: //judge the key and send message mBC?Pg  
     break;   SW ^F  
   } G G]4g)O5  
   for(int index=0;index<MAX_KEY;index++) 478gl o  
   { _{fh/{b1  
    if(hCallWnd[index]==NULL) #3l&N4/  
     continue; f?OFMac  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ungex@s_  
    { _%` )cOr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Hvto]~=GQ  
     bProcessed=TRUE; G{,X_MZ%  
    } cg-\|H1  
   } ~9N n8g6  
  } gi|j ! m  
  if(!bProcessed){ u/5 ^N^@^  
   for(int index=0;index<MAX_KEY;index++){ b42"Y,sbB  
    if(hCallWnd[index]==NULL) h#ogL-UU  
     continue; df=G}M(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ' w^Md  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); y my/`%  
   } z3V[ Vi  
  } '$@bTW  
 } #Ont1>T,G  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); bn b:4?d]  
} %z}{jqD&:X  
ai!zb2j!E  
BOOL InitHotkey() @pcmVsIp  
{ |2#)lGA  
 if(hHook!=NULL){ L{py\4z'_  
  nHookCount++; U,?[x2LF  
  return TRUE; &&/2oP+z  
 } @ j/UDM  
 else " Zo<$p3]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); h/7m.p]  
  if(hHook!=NULL) ^h}xFiAV#  
   nHookCount++; 1Y2]jz4  
  return (hHook!=NULL); i/j DwA  
} i$GL]0  
BOOL UnInit() T2Q`Ax7  
{ }pOem}  
 if(nHookCount>1){ !Nu ~4  
  nHookCount--; Z%]s+V)st  
  return TRUE; 1$&(ei]*:  
 } yHY \4OHS  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .DzFt c  
 if(unhooked==TRUE){ gVM&wo |  
  nHookCount=0; t u )kWDk  
  hHook=NULL; K\w:'%>-  
 } 8reis1]2S  
 return unhooked; V&i/3g  
} q97Z .o  
llbf(!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F|,_k%QP  
{ lV4|(NQ9  
 BOOL bAdded=FALSE; vkFq/+'U  
 for(int index=0;index<MAX_KEY;index++){ eI%{/>  
  if(hCallWnd[index]==0){ MGt[zLF9  
   hCallWnd[index]=hWnd; }YiE} +VW|  
   HotKey[index]=cKey; D%CKkQ<u2  
   HotKeyMask[index]=cMask; ~J :cod  
   bAdded=TRUE; C,2k W`[V  
   KeyCount++; 0+\%os V  
   break; zGDLF`  
  } ws!pp\F  
 } ak :Y<}  
 return bAdded; `Bw>0%.  
} .c+NsI9}  
l :e&w(1H  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4'Svio  
{ &:K!$W  
 BOOL bRemoved=FALSE; 2U;6sn*e  
 for(int index=0;index<MAX_KEY;index++){ <OQn |zU\  
  if(hCallWnd[index]==hWnd){ S}@J4}*u["  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kx6AMx!nX  
    hCallWnd[index]=NULL; k/ 6Qwb#  
    HotKey[index]=0; Bu[sSoA  
    HotKeyMask[index]=0; }XJA#@  
    bRemoved=TRUE; M0+xl+c+  
    KeyCount--; `x{*P.]N!<  
    break; |ia#Elavo  
   } ] LcCom:]  
  } 4=BIYC"Lu  
 } q5@N//<DNN  
 return bRemoved; gk &  
} d:j65yu  
[;?CO<  
void VerifyWindow() Pv- i.  
{ t)!(s,;T  
 for(int i=0;i<MAX_KEY;i++){ ,;&j*qFi  
  if(hCallWnd!=NULL){ %T~3xQ  
   if(!IsWindow(hCallWnd)){ MBeubS  
    hCallWnd=NULL; Wu}84W"!.V  
    HotKey=0; 16J" QUuG  
    HotKeyMask=0; ><t4 f(d  
    KeyCount--; 8>\tD  
   } /0.m|Th'm  
  } A_:CGtv:  
 } Mm&#I[:  
} ECZ`I Z.  
$N;Nvp2  
BOOL CHookApp::InitInstance() `#/0q*$  
{ *H2@lrc  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9oe=*#Ig1m  
 hins=AfxGetInstanceHandle(); No|T#=BZ[  
 InitHotkey(); wFe?0u  
 return CWinApp::InitInstance(); @%aU)YDwi  
} Q%_QT0H9Kz  
^x BQ#p  
int CHookApp::ExitInstance() #N?VbDK9_  
{ ;hz;|\ko5  
 VerifyWindow(); mz[Q]e~&i  
 UnInit(); {5GXN!f  
 return CWinApp::ExitInstance(); -:$#koW  
} >cTSX  
C2X$bX"  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file bfE4.YF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {*BZ;Xh\8  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3xhGmD\SKO  
#if _MSC_VER > 1000 nM<B{AR5^  
#pragma once IBT 1If3  
#endif // _MSC_VER > 1000 R [qfG! "  
Lrrc&;  
class CCaptureDlg : public CDialog bgk+PQ#S-  
{ rpB0?h!$  
 // Construction X[e:fW[e)  
 public: y7X2|$9z-  
  BOOL bTray; bjO?k54I  
  BOOL bRegistered; xWiR7~E  
  BOOL RegisterHotkey(); fk6`DUBV  
  UCHAR cKey; ZC99/NWN  
  UCHAR cMask; v,[E*qMN  
  void DeleteIcon(); sB~|V <  
  void AddIcon(); H;1_"  
  UINT nCount; hw @)W  
  void SaveBmp(); (D<_ iV  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor |ee A>z"I  
  // Dialog Data J,W<vrKOcN  
  //{{AFX_DATA(CCaptureDlg)  l_2B  
  enum { IDD = IDD_CAPTURE_DIALOG }; nT:F{2 M;  
  CComboBox m_Key; 0x Er`]]U  
  BOOL m_bControl; iaV%*  
  BOOL m_bAlt; ~Y_5q)t(  
  BOOL m_bShift; [C0"vOTUb  
  CString m_Path;  X_\$hF  
  CString m_Number; # n_gry!5  
  //}}AFX_DATA |7$Q'3V  
  // ClassWizard generated virtual function overrides B - 1Kfc  
  //{{AFX_VIRTUAL(CCaptureDlg) D;Bij=  
 public: Qo5yfdR  
  virtual BOOL PreTranslateMessage(MSG* pMsg); fe3a_gYPz  
 protected: \ cr)O^&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (i1q".  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,6EFJVu \  
  //}}AFX_VIRTUAL @'> Ul!.]  
  // Implementation )8JfBzR  
 protected: RSTA!?K/.  
  HICON m_hIcon; qlNB\~HCe  
  // Generated message map functions k9*6`w  
  //{{AFX_MSG(CCaptureDlg) gb^<6BYUG  
  virtual BOOL OnInitDialog();  d5YL=o  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VE $Kdo^  
  afx_msg void OnPaint(); %7S{g  
  afx_msg HCURSOR OnQueryDragIcon(); yADX^r(  
  virtual void OnCancel(); N hY`_?)  
  afx_msg void OnAbout(); hWz/PK,  
  afx_msg void OnBrowse(); a !yBEpMo  
  afx_msg void OnChange(); hU~up a<dD  
 //}}AFX_MSG ^&z3zFTp  
 DECLARE_MESSAGE_MAP() d%~OEq1i"  
}; g9.y`o}c  
#endif W[G5+*i  
'3uN]-A>D  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file = j!nt8]8  
#include "stdafx.h" W%-`  
#include "Capture.h" ml1My1  
#include "CaptureDlg.h" mD_sf_2>  
#include <windowsx.h> "Q.KBX v/  
#pragma comment(lib,"hook.lib") n|'}W+  
#ifdef _DEBUG CxV$_J  
#define new DEBUG_NEW wZsjbNf`K  
#undef THIS_FILE ZWb\^N  
static char THIS_FILE[] = __FILE__; <ht^Ck  
#endif K&{ruHoKB  
#define IDM_SHELL WM_USER+1 X EL~y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >h9T/J8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <"z9(t(V\%  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; fAT+x1J\  
class CAboutDlg : public CDialog nkO4~p  
{ #GfM!<q<  
 public: 6 9s%   
  CAboutDlg(); XE`u  
  // Dialog Data <Em|0hth  
  //{{AFX_DATA(CAboutDlg) b^'>XT~1J&  
  enum { IDD = IDD_ABOUTBOX }; (o2.*x  
  //}}AFX_DATA d9.I83SS  
  // ClassWizard generated virtual function overrides (v0i]1ly[  
  //{{AFX_VIRTUAL(CAboutDlg) _x]q`[Dih  
 protected: Yc-gJI*1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6#;u6@+}yy  
  //}}AFX_VIRTUAL 7.nNz&UG]5  
  // Implementation l H{~?x  
 protected: bNG7A[|B  
  //{{AFX_MSG(CAboutDlg) J] )gXVRM  
  //}}AFX_MSG b\Mb6s  
  DECLARE_MESSAGE_MAP() /ptG  
}; xxZO{_q  
XNr8,[c  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 9`Y\`F#}q  
{ rebWXz7  
 //{{AFX_DATA_INIT(CAboutDlg) ZRP[N)Ld$  
 //}}AFX_DATA_INIT Y?4N%c_;  
} 0/JTbf. CX  
\y0]BH  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) swfjKBfw+g  
{ 4CK$W` V  
 CDialog::DoDataExchange(pDX); A,;[9J2\&  
 //{{AFX_DATA_MAP(CAboutDlg) av>Ff6w)Y  
 //}}AFX_DATA_MAP )5ev4Qf  
} <y<   
ja%IGaH;s  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) l:14uWu|  
 //{{AFX_MSG_MAP(CAboutDlg) eEX*\1Gg  
 // No message handlers D"<>! ]@(a  
 //}}AFX_MSG_MAP @0D  
END_MESSAGE_MAP() s(r1q$5  
n*m"yp  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~kOXMLRg  
: CDialog(CCaptureDlg::IDD, pParent) 2SXy)m !  
{ S.*.nv  
 //{{AFX_DATA_INIT(CCaptureDlg) 4<S=KFT_  
  m_bControl = FALSE; .GiQC {@9w  
  m_bAlt = FALSE; |HQFqa <  
  m_bShift = FALSE; nyx(0  
  m_Path = _T("c:\\"); Tilw.z  
  m_Number = _T("0 picture captured."); yhxZ^ (I  
  nCount=0; [-hsG E  
  bRegistered=FALSE; rds0EZ4W  
  bTray=FALSE; cdv0:+[P  
 //}}AFX_DATA_INIT ^o[(F<q  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 "vo o!&<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?Vc/mO2X  
} S20E}bS:>  
wT&P].5n  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) K{`3,U2Wx  
{ DxzNg_E]  
 CDialog::DoDataExchange(pDX); "64D.c(r$  
 //{{AFX_DATA_MAP(CCaptureDlg) qj*77  
  DDX_Control(pDX, IDC_KEY, m_Key); b/&{:g!B  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); nzl3<Ar  
  DDX_Check(pDX, IDC_ALT, m_bAlt); :Y[?@/m4  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {TC_ 4Y|8  
  DDX_Text(pDX, IDC_PATH, m_Path); hEfFMi=a`  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Z#flu Q%V  
 //}}AFX_DATA_MAP %!V=noo  
} T-.Bof(?w  
^dR gYi"(A  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wQrD(Dv(yA  
//{{AFX_MSG_MAP(CCaptureDlg) RO.bh#A$  
 ON_WM_SYSCOMMAND() !UX7R\qu|  
 ON_WM_PAINT() FK,Jk04on  
 ON_WM_QUERYDRAGICON() dRXdV7-!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) x}jiHV@=  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) F=V_ACU  
 ON_BN_CLICKED(ID_CHANGE, OnChange) m$A-'*'  
//}}AFX_MSG_MAP ;f~z_3g  
END_MESSAGE_MAP() `YK%I8  
&` weW  
BOOL CCaptureDlg::OnInitDialog() ! 345  
{ 2VgVn,c  
 CDialog::OnInitDialog(); '9 Xw_1B  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); OYY_@'D  
 ASSERT(IDM_ABOUTBOX < 0xF000); QUi=ZD1  
 CMenu* pSysMenu = GetSystemMenu(FALSE); jHM}({)-  
 if (pSysMenu != NULL) 1w|u ^[~u\  
 { z{G@t0q  
  CString strAboutMenu; G-G\l?R(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Wfj*)j Q  
  if (!strAboutMenu.IsEmpty()) 3R[,,WAj$  
  { H JjW  
   pSysMenu->AppendMenu(MF_SEPARATOR); (!dwUB  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); TuMD+^x  
  } c7/fQc)h4d  
 } @^K_>s9B  
 SetIcon(m_hIcon, TRUE); // Set big icon [p 8fg!|  
 SetIcon(m_hIcon, FALSE); // Set small icon d>jRw  
 m_Key.SetCurSel(0); W*Ce1  
 RegisterHotkey(); ZsL-vlv  
 CMenu* pMenu=GetSystemMenu(FALSE); Q=.j>aM+_  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -LMO f?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ]tO9<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); G FO(O  
 return TRUE; // return TRUE unless you set the focus to a control  #)28ESj  
} 0?\d%J!"S  
/r mm@  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \I~9%QJ>  
{ TDjjaO  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) vV /fTO  
 { `yWWX.`  
  CAboutDlg dlgAbout; ^*+-0b;[G  
  dlgAbout.DoModal(); f*GdHUZ*  
 } S0-/9h  
 else ^]1M8R,  
 { `|g*T~; kC  
  CDialog::OnSysCommand(nID, lParam); O-YB +~"3Z  
 } ]5hGSl2  
} zoO9N oUHW  
O^I%Xk  
void CCaptureDlg::OnPaint() 2ZZF hj  
{ p/%B>Y >  
 if (IsIconic()) CsW*E,|xyP  
 { H2D j`0  
  CPaintDC dc(this); // device context for painting 7EukrE<b'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4@ =l'Fw  
  // Center icon in client rectangle 2_#V w&v  
  int cxIcon = GetSystemMetrics(SM_CXICON); 62z"cFN  
  int cyIcon = GetSystemMetrics(SM_CYICON); h]#bPb  
  CRect rect; pxO ?:B  
  GetClientRect(&rect); ]WP[hF  
  int x = (rect.Width() - cxIcon + 1) / 2; DeL7sU  
  int y = (rect.Height() - cyIcon + 1) / 2; E/N*n!sV  
  // Draw the icon z\Y-8a.]  
  dc.DrawIcon(x, y, m_hIcon); F!qt#Sw!\  
 } >aV Q  
 else H:&|q+K=#  
 { >XiTl;UU  
  CDialog::OnPaint(); SSG}'W!z  
 } mtu`m6Xix  
} a]u1_ $)  
vW:XM0  
HCURSOR CCaptureDlg::OnQueryDragIcon() 6=xbi{m$  
{ J#tY$PE  
 return (HCURSOR) m_hIcon; U,)@+?U+h  
} ~}F$1;t0  
JYU0&nZl4  
void CCaptureDlg::OnCancel() kqie|_y  
{ ; \N${YIn  
 if(bTray) 6Y(Vs>  
  DeleteIcon(); 0(~,U!g[=  
  CDialog::OnCancel(); 3-Xc3A=w  
} Ib665H7w  
3gzcpFNqX  
void CCaptureDlg::OnAbout() v5!G/TZ1  
{ KZ}F1Mr  
 CAboutDlg dlg; @f wk  
 dlg.DoModal(); TWFi.w4pY  
} |6}:n,KA.  
Sx%vJYH0  
void CCaptureDlg::OnBrowse() Sxw%6Va]p  
{ :6Oh?y@  
 CString str; " O,TL *$  
 BROWSEINFO bi; Q\4nduQ  
 char name[MAX_PATH]; "mm|0PUJ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -8r9DS -/W  
 bi.hwndOwner=GetSafeHwnd(); eTp}*'$p  
 bi.pszDisplayName=name; M&5;Qeoiv  
 bi.lpszTitle="Select folder"; y8.(filNB  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ,awp)@VG7  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); CH/*MA  
 if(idl==NULL) <M4Qc12jP  
  return; KoPhPH  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (}C%g{8  
 str.ReleaseBuffer(); v<qiu>sbz}  
 m_Path=str; 0^PI&7A?y  
 if(str.GetAt(str.GetLength()-1)!='\\') ^%qh E8  
  m_Path+="\\"; .g6DKjy>  
 UpdateData(FALSE); p&%M=SzN  
} x>yeF,q1  
8O5@FU 3  
void CCaptureDlg::SaveBmp() _4VS.~}/R  
{ + ^9;<>P  
 CDC dc; i+z;tF`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); wEImpsC`  
 CBitmap bm; u*NU MT2  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^Q\O8f[u  
 int Height=GetSystemMetrics(SM_CYSCREEN); yb(zyGe  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ages-Z_X  
 CDC tdc; ped3}i+|]  
 tdc.CreateCompatibleDC(&dc); K&WNtk3hT  
 CBitmap*pOld=tdc.SelectObject(&bm); !hJ% :^ xL  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %hu] =  
 tdc.SelectObject(pOld); S2jO  
 BITMAP btm; #iot.alNA  
 bm.GetBitmap(&btm); '0!IF&p'  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; `jur`^S|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); {,|J?>{  
 BITMAPINFOHEADER bih; #!%\97ZR  
 bih.biBitCount=btm.bmBitsPixel; }m~2[5q%/  
 bih.biClrImportant=0; p<@0b  
 bih.biClrUsed=0; O!(FNv0  
 bih.biCompression=0; !PfIe94{`  
 bih.biHeight=btm.bmHeight; ir4uy  
 bih.biPlanes=1; n./onv  
 bih.biSize=sizeof(BITMAPINFOHEADER); E Fx@O  
 bih.biSizeImage=size; y ~ A]  
 bih.biWidth=btm.bmWidth; DfCo=  
 bih.biXPelsPerMeter=0; W*xz 0  
 bih.biYPelsPerMeter=0; nFn@Z'T$N  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +r+H`cT@  
 static int filecount=0; b7:B[7yK.x  
 CString name; I+Q`i:\,q  
 name.Format("pict%04d.bmp",filecount++); :X`Bc"  
 name=m_Path+name; F+`DfI]/m  
 BITMAPFILEHEADER bfh; 3??*G8Yp  
 bfh.bfReserved1=bfh.bfReserved2=0; om"q[Tudc  
 bfh.bfType=((WORD)('M'<< 8)|'B'); m*h, <,}-+  
 bfh.bfSize=54+size; @42!\1YT  
 bfh.bfOffBits=54; dpBG)Xzoyv  
 CFile bf; a?IL6$z  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Bpjwc<U  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); J@{yWgLg  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $cLtAo^W  
  bf.WriteHuge(lpData,size); S;"7d  
  bf.Close(); aeESS;JxJj  
  nCount++; >o\[?QvP  
 } K%: :  
 GlobalFreePtr(lpData); l/BE~gdl  
 if(nCount==1) \@kY2,I V  
  m_Number.Format("%d picture captured.",nCount); wNuS'P_(:T  
 else p1=sDsLL  
  m_Number.Format("%d pictures captured.",nCount); Ah2%LXdHA  
  UpdateData(FALSE); 1f 0"z1   
} T#1>pED  
]Qp0|45=  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) G;+hc%3y  
{ -L/5Nbup  
 if(pMsg -> message == WM_KEYDOWN) MK]S205{  
 { }{^i*T5rl  
  if(pMsg -> wParam == VK_ESCAPE) z/7H/~d  
   return TRUE; ")U`Wgx  
  if(pMsg -> wParam == VK_RETURN) -4JdK O  
   return TRUE; 9Q".166  
 } >s E5zj|V  
 return CDialog::PreTranslateMessage(pMsg); 2w=0&wG4K  
} P]Z}% 8^O  
vXnTPjbE  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;X u&['  
{ <!\J([NM8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Riq5Au?*)  
  SaveBmp(); %aX<p{EY  
  return FALSE; BPnZ"w_  
} - v9V/LJ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Kfc(GL?  
 CMenu pop; Q:]F* p2  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1anV!&a<K(  
 CMenu*pMenu=pop.GetSubMenu(0); 'M\ou}P  
 pMenu->SetDefaultItem(ID_EXITICON); xA nAW  
 CPoint pt; Llf>C,)  
 GetCursorPos(&pt); G! uQ|<(  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); G}<q  
 if(id==ID_EXITICON) %Gn(b 1X  
  DeleteIcon(); 35yhe:$nf  
 else if(id==ID_EXIT) Gb%PBg}HH  
  OnCancel(); ,vQkvuz  
 return FALSE; bwo"s[w  
} O'deQq[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :L9\`&}FS  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (jkjj7a  
 AddIcon(); }k}5\%#li5  
 return res; J4te!,  
} ]"^GRFK5  
FXFQ@q*}v  
void CCaptureDlg::AddIcon() YTq>K/  
{ H BmjB=  
 NOTIFYICONDATA data; AKM\1H3U  
 data.cbSize=sizeof(NOTIFYICONDATA); `3r*Ae  
 CString tip; p&bQ_XOH  
 tip.LoadString(IDS_ICONTIP); {S\cpCI`  
 data.hIcon=GetIcon(0); C+}uH:I'L  
 data.hWnd=GetSafeHwnd(); Z{RgpVt  
 strcpy(data.szTip,tip); hNFMuv  
 data.uCallbackMessage=IDM_SHELL; 8|7fd|6~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; VLtb16|  
 data.uID=98; J6Mm=bO5  
 Shell_NotifyIcon(NIM_ADD,&data); c0Jf  
 ShowWindow(SW_HIDE); Y( /VW&K&:  
 bTray=TRUE; (~{7e/)r  
} a2iaP  
jHB,r^:'  
void CCaptureDlg::DeleteIcon() f7XmVCz1  
{ p`{9kH1me  
 NOTIFYICONDATA data; $$ \| 3rj!  
 data.cbSize=sizeof(NOTIFYICONDATA); 0;e>kz3o  
 data.hWnd=GetSafeHwnd(); xYRL4  
 data.uID=98; LL-MZ~ZB  
 Shell_NotifyIcon(NIM_DELETE,&data); \J0gzi.  
 ShowWindow(SW_SHOW); a+*|P  
 SetForegroundWindow(); g{l;v  
 ShowWindow(SW_SHOWNORMAL); x!!: jL'L  
 bTray=FALSE; cX1"<fD o  
} O>w $  
2N(c&Dzkh`  
void CCaptureDlg::OnChange() t,R5FoV  
{ u9m"{KnV  
 RegisterHotkey(); <H)h+?&~d  
} ,[+gE\z{{u  
vC\]7]mC  
BOOL CCaptureDlg::RegisterHotkey()  7P]_03  
{ ` M"Zq  
 UpdateData(); L<QqQ"`  
 UCHAR mask=0; t ba%L  
 UCHAR key=0; f? [y-  
 if(m_bControl) y S7[=S  
  mask|=4; [F+lVb  
 if(m_bAlt) Wuye:b!  
  mask|=2; ~oT0h[<  
 if(m_bShift) "S#0QH%5  
  mask|=1; ^#exs Xy  
  key=Key_Table[m_Key.GetCurSel()]; sKjg)3Sl  
 if(bRegistered){ nb'],({:9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); LUKdu&M  
  bRegistered=FALSE;  UX2`x9  
 } sh}=#eb  
 cMask=mask; kY xn5+~  
 cKey=key; } RG  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @?*26}qp  
 return bRegistered; 5Z6$90!k  
} ]Rnr>_>x;  
Z'WoChjM  
  四、小结  ;{BELv-4  
rN$_(%m_N  
  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
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
10+5=?,请输入中文答案:十五