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
  • 7817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: yi!`V.  
  >[*4Tjg  
  一、实现方法 rj  H`  
So4nJ><p  
  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: ]7qiUdxt:  
fUcLfnr  
#pragma data_seg("shareddata") d34Y'r  
HHOOK hHook =NULL; //钩子句柄 @Z\~  
UINT nHookCount =0; //挂接的程序数目 S]2 {ZDP  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \3PE+$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 cBEHH4U  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey t;#Gmo  
static int KeyCount =0; zX5G;,_  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 fnH3 CE  
#pragma data_seg() #o[\Dwu  
Dl;d33  
  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。 KAb(NZK  
,{<p  
  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: d\]O'U)s  
Bh`IXu  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR R,Ml&4pZ}  
cKey,UCHAR cMask) if~rp-\P  
{ XT||M)#  
 BOOL bAdded=FALSE; j Selop>N  
 for(int index=0;index<MAX_KEY;index++){ L0&S0HG   
  if(hCallWnd[index]==0){ ^,7=X8Su  
   hCallWnd[index]=hWnd; *_)E6Y?9  
   HotKey[index]=cKey;  ^Omfe  
   HotKeyMask[index]=cMask; H=. K  
   bAdded=TRUE; +{rJ[J/g  
   KeyCount++; am:.NG+  
   break; 5}a"?5J^  
  } \f"?Tv-C'  
 } A8dI:E+$  
 return bAdded; 8wF#e\Va0  
} 4MX7=!E  
//删除热键 o'qm82* =  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vR]mSX3)?  
{ u@D .i4U  
 BOOL bRemoved=FALSE; k!E"wJkpz  
 for(int index=0;index<MAX_KEY;index++){ F";FG 0  
  if(hCallWnd[index]==hWnd){ 1VfSSO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #pu}y,QN$  
    hCallWnd[index]=NULL; o =9'  
    HotKey[index]=0; YsAF{  
    HotKeyMask[index]=0; k|#Zy,  
    bRemoved=TRUE; #?m{YT{P  
    KeyCount--; -2lRia  
    break; *ro.mQ_  
   } 3A R%&:-  
  } ){tPP$-i=  
 } |s`Kd-'|q  
 return bRemoved; ?L`ZKRD  
} K^ 6+Ily  
v>at/ef  
v*L '{3f  
  DLL中的钩子函数如下: NW De-<fQ  
v&2+'7]w r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 'rx?hL3VW  
{ 8vJdf9pB*  
 BOOL bProcessed=FALSE; m"-G6BKS  
 if(HC_ACTION==nCode) :r39wFi  
 { I*c;hfu  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }jcIDiSu  
   switch(wParam) Opry`}5h  
   {  CZfE |T~  
    case VK_MENU: b"P&+c  
     MaskBits&=~ALTBIT; `Qq/ F]  
     break; -kc(u1!  
    case VK_CONTROL: qC.i6IL  
     MaskBits&=~CTRLBIT; 0Bu*g LY  
     break; kJeu40oN  
    case VK_SHIFT: 6J;i,/ky  
     MaskBits&=~SHIFTBIT;  h,hL?imD  
     break; 1(pjVz&  
    default: //judge the key and send message ,cS0  
     break; 3k{c$x}  
   } ._ih$=   
   for(int index=0;index<MAX_KEY;index++){ ^^ j/  
    if(hCallWnd[index]==NULL) lE a W7j  
     continue; acP ;(t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DvJB59:_}  
    { eE,;K1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); J=P;W2L  
     bProcessed=TRUE; pe#*I/)b  
    } Yhk6Uog{4  
   } 2+&R" #I  
  } tnL."^%A2I  
  else if((lParam&0xc000ffff)==1){ //有键按下 1g81S_T .  
   switch(wParam) gA"<MI'y  
   { +{Gw9h"5g*  
    case VK_MENU: N&N 82OG  
     MaskBits|=ALTBIT; =g[H]-Ee  
     break; {]@Qu"M  
    case VK_CONTROL: r8+*|$K  
     MaskBits|=CTRLBIT; 9;pzzZ  
     break; ^Yr|K  
    case VK_SHIFT: IrUi E q  
     MaskBits|=SHIFTBIT; {DS\!0T-X  
     break; dh?S[|='  
    default: //judge the key and send message XqX I(q^  
     break; `rq<jtf+  
   } ,0.|P`|w  
   for(int index=0;index<MAX_KEY;index++){ &*ZC0V3  
    if(hCallWnd[index]==NULL) @LHtt/&  
     continue; F_ _H(}d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mf~Lzp  
    { X,&xhSzg?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {\luieG  
     bProcessed=TRUE; Y 0]Kl^\A  
    } 4UazD_`'  
   } -g<cinNSp  
  } tnNZ`]qY  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Lv^a+'  
   for(int index=0;index<MAX_KEY;index++){ v2(U(Tt  
    if(hCallWnd[index]==NULL) fX""xT NPi  
     continue; 9yDFHz w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) p/4S$ j#Tn  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Q+HZ?V(  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 RAdvIIQp:  
   } pB[%:w/@l:  
  } .oEFX8  
 } EuLXtq  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A mvw`u>  
} 0|GpZuGO9  
a2[ 8wv1  
  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: $xQ"PJ2  
 srvYAAE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); | [p68v>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "zXGp7Q'#  
Ys)+9yPPn  
  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: Sr-|,\/O  
( -xR7A  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 17|@f  
{ )< l\jfx e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) df!+T0  
 { FSFFk~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 N JXa_&_  
  SaveBmp(); jjYM3LQcdP  
  return FALSE; _qEWu Do  
 } 5a8JVDLX^  
 …… //其它处理及默认处理 '+tKvTU;  
} HqB|SWyK  
VVgsLQd  
yW[L,N7d  
  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。 Jm%mm SYK  
ofVEao  
  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。 8g-P_[>  
dG" K/|  
  二、编程步骤 $R8>u#K!  
<&KLo>B^  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; /cM 5  
^zKt{a  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; a4Ls^  
2\DTJ`Y,  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; (y%%6#bd  
`:V}1ioX5  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; uAc@ Z-  
IPwj_jvw  
  5、 添加代码,编译运行程序。 ZK%Kgk[\:~  
sbs[=LW4  
三、程序代码 o?;F.W_  
`8mD7xsg$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL RfD{g"]y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) fFjLp l  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ U0!^m1U:  
#if _MSC_VER > 1000 U.HoFf+HN  
#pragma once .MzOLv   
#endif // _MSC_VER > 1000 mu 2 A%"7  
#ifndef __AFXWIN_H__ \nrgAC-b  
#error include 'stdafx.h' before including this file for PCH =DGn,i9  
#endif 44Q6vb?  
#include "resource.h" // main symbols '" ^ B&W  
class CHookApp : public CWinApp R|nEd/' <  
{ ~?2rGE  
 public: ]jZiW1C*a  
  CHookApp(); (zjz]@qJ  
  // Overrides bELIRM9  
  // ClassWizard generated virtual function overrides 71JM [2  
  //{{AFX_VIRTUAL(CHookApp) )3BR[*u*  
 public: =X)Q7u".7  
  virtual BOOL InitInstance(); ,Le&I9*%  
  virtual int ExitInstance(); Y;'VosTD  
  //}}AFX_VIRTUAL NG!>7$@RV  
  //{{AFX_MSG(CHookApp) Rrh<mo(yj#  
  // NOTE - the ClassWizard will add and remove member functions here. }Q47_]5  
  // DO NOT EDIT what you see in these blocks of generated code ! e$ThSh\+(  
  //}}AFX_MSG tx2Vyu  
  DECLARE_MESSAGE_MAP() dDsjPM;2  
}; mrK,Ql  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); i_[^s:*T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?SB[lbU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  $&ex\_W  
BOOL InitHotkey(); sI^@A=.@  
BOOL UnInit(); $,8CH)w  
#endif R;0W+!fE  
ZM dM_i?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. UOn!Y@  
#include "stdafx.h" 7(yXsVq  
#include "hook.h" }f<fgY  
#include <windowsx.h> [?Mc4uT{  
#ifdef _DEBUG C/{nr-V3u  
#define new DEBUG_NEW *p""YEN  
#undef THIS_FILE `G_(xN7O  
static char THIS_FILE[] = __FILE__; Es.toOH$S  
#endif 73'U#@g6  
#define MAX_KEY 100  R4&|t  
#define CTRLBIT 0x04 2$o2.$i81  
#define ALTBIT 0x02 L@)b%Q@a  
#define SHIFTBIT 0x01 E}xz7u   
#pragma data_seg("shareddata") 3~cS}N T  
HHOOK hHook =NULL; l9M#]*{  
UINT nHookCount =0; f28gE7Y\a  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey f?/|;Zo4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [z W_%O kP  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey n@G:e-m{A  
static int KeyCount =0; \e`6=Q%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift FBR$,j;Y  
#pragma data_seg() 1<XiD 3H;  
HINSTANCE hins; kA7~Yu5|  
void VerifyWindow(); c%q}"Y0oh  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) J0IdFFZ|w  
//{{AFX_MSG_MAP(CHookApp) ;FV~q{  
// NOTE - the ClassWizard will add and remove mapping macros here. !L &=?CX  
// DO NOT EDIT what you see in these blocks of generated code! Zp/qs z(]  
//}}AFX_MSG_MAP ^2&O3s  
END_MESSAGE_MAP() O!#L#u53  
\SYPu,ZT  
CHookApp::CHookApp() &Iv\jhq  
{ n;-x!Gs  
 // TODO: add construction code here, btUUZ"q<  
 // Place all significant initialization in InitInstance ""25ay  
} E[SV*1)  
4@/q_*3o  
CHookApp theApp; H B::0l<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^ I{R[O'8  
{ DBj;P|L_  
 BOOL bProcessed=FALSE; _4~ng#M*  
 if(HC_ACTION==nCode) gp#bQ  
 { LU-#=1Q  
  if((lParam&0xc0000000)==0xc0000000){// Key up k7z(Gbzu   
   switch(wParam) lU&`r:1>_  
   { "@c';".|  
    case VK_MENU: gt2>nTJz.Z  
     MaskBits&=~ALTBIT; eEZ|nEU  
     break; K B`1%=  
    case VK_CONTROL: (&9DB   
     MaskBits&=~CTRLBIT; #U ",,*2  
     break; "sX [p  
    case VK_SHIFT: +t7c&td\  
     MaskBits&=~SHIFTBIT; n.Ur-ot  
     break; %0ll4"  
    default: //judge the key and send message eZ8Y"i\!y  
     break; yS:IRI.  
   } 7|h3.  
   for(int index=0;index<MAX_KEY;index++){ 7$q2v=tH_  
    if(hCallWnd[index]==NULL) tF#b&za  
     continue; s8f3i\1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6T{o3wc;  
    { L]/\C{}k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )rs|=M=Xk  
     bProcessed=TRUE; dVj'  
    } ~xlMHf  
   } +LQs.*  
  } :=iM$_tp'  
  else if((lParam&0xc000ffff)==1){ //Key down I:uQB!  
   switch(wParam) [T}%q"<  
   { e B(S+p?  
    case VK_MENU: @w#gRQCl  
     MaskBits|=ALTBIT; ijZydn  
     break; =u:6b} =  
    case VK_CONTROL: 94qHY1rp  
     MaskBits|=CTRLBIT; brYYuN|Vc  
     break; J^s<x#C  
    case VK_SHIFT: r2E>sHw  
     MaskBits|=SHIFTBIT; 6*(h9!_T1  
     break; vUo.BA#;.b  
    default: //judge the key and send message v2Qc}o  
     break; a.Rp#}f  
   } 1,%#O;ya  
   for(int index=0;index<MAX_KEY;index++) ^H\-3/si*  
   { aowPji$H  
    if(hCallWnd[index]==NULL) W[1f]w3  
     continue; PtPGi^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Dj,+t+|  
    { &G7)s%q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w{:Oa7_A  
     bProcessed=TRUE; XoH[MJC  
    } *Lb(urf  
   } 0?5%  
  } Fl#VKU3h  
  if(!bProcessed){ ERX|cc  
   for(int index=0;index<MAX_KEY;index++){ !5E%W[  
    if(hCallWnd[index]==NULL) i)ES;b4  
     continue; HYI1 o/}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 764}yV>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  f>wW}-  
   } Il&"=LooZ  
  } 5uD#=/oV  
 } jnU*l\,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jOm&yX  
} mP5d!+[8  
Ch \ed|u  
BOOL InitHotkey() {'c%#\  
{ aoakTi!}  
 if(hHook!=NULL){ #8Id:56  
  nHookCount++; z!1/_]WJ,  
  return TRUE; E-tNB{r@  
 } +Qi52OG  
 else @8Q+=abz  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); . tH35/r  
  if(hHook!=NULL) k`2B9,z  
   nHookCount++; yZ?_q$4kEI  
  return (hHook!=NULL); k^dCX+  
} ?{.b9`  
BOOL UnInit() 8x^H<y=O  
{ mtWx ?x  
 if(nHookCount>1){ v_@#hf3  
  nHookCount--; 3R:7bex  
  return TRUE; Y;> p)'z  
 } xV n]m9i  
 BOOL unhooked = UnhookWindowsHookEx(hHook); !s[j1=y  
 if(unhooked==TRUE){ 6(<~1{ X%  
  nHookCount=0; ]=86[A-2N  
  hHook=NULL; UTK.tg  
 } ;qVEI/  
 return unhooked; >;'1k'  
} ;@ll  
u>Axq3F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !irX[,e  
{ /m{?o  
 BOOL bAdded=FALSE; 8|jX ~f  
 for(int index=0;index<MAX_KEY;index++){ R0YC:rAt  
  if(hCallWnd[index]==0){ K3r>nGLBo  
   hCallWnd[index]=hWnd; dn)tP6qc/  
   HotKey[index]=cKey; J\dhi{0  
   HotKeyMask[index]=cMask; 4G;`KqR@  
   bAdded=TRUE; [[66[;  
   KeyCount++; t6L^ #\'  
   break; [@. jL0>  
  } .J6 j"  
 } 9J;H.:WH  
 return bAdded; ^qzT5W\@  
} MlC-Aad(  
K` _E>k  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1:{O RX[;  
{ jXDzjt94J  
 BOOL bRemoved=FALSE; Uhx2 _  
 for(int index=0;index<MAX_KEY;index++){ RJ@e5A6_  
  if(hCallWnd[index]==hWnd){ |_xiG~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "w|k\1D  
    hCallWnd[index]=NULL; #:\+7mCF  
    HotKey[index]=0; J*lYH]s  
    HotKeyMask[index]=0; MTITIecw=  
    bRemoved=TRUE; Mi/'4~0Y  
    KeyCount--; z5*O@_r+.b  
    break; D16;6K'{  
   } e~ 78'UH  
  } n%ArA])_&  
 } tSXjp  
 return bRemoved; _Fh0^O@  
} <T_Nlar^^  
_8b>r1$  
void VerifyWindow() vVN[bD<  
{ ={i&F  
 for(int i=0;i<MAX_KEY;i++){ +$mskj0s  
  if(hCallWnd!=NULL){ HG3>RcB  
   if(!IsWindow(hCallWnd)){ $5"-s]  
    hCallWnd=NULL; g-V\ s&}  
    HotKey=0; dBq,O%$oq  
    HotKeyMask=0; h9n<ped`A;  
    KeyCount--; QsF<=b~  
   } \FY De  
  } XOU-8;d  
 } x#gmliF  
} owY_cDzrH  
\7tvNa,C  
BOOL CHookApp::InitInstance() k&"qdB(I  
{ O7CYpn4<7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); xo_k"'f+  
 hins=AfxGetInstanceHandle(); +U/"F|M  
 InitHotkey(); cp?P@-  
 return CWinApp::InitInstance(); nu9k{owB T  
} nPIR 1Z  
3^-)gK  
int CHookApp::ExitInstance() /G{3p&9  
{ y $ DB  
 VerifyWindow(); N8(x),  
 UnInit(); .Zt/e>K&  
 return CWinApp::ExitInstance(); 0JRB Nh  
} ZG[0rvW  
YK+Z0ry  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file .6/p4OR|  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |2&mvjk@H  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ gLxy RbVI  
#if _MSC_VER > 1000 hE#8_34%s  
#pragma once rHdP4:n  
#endif // _MSC_VER > 1000 WI 4_4  
S"A_TH  
class CCaptureDlg : public CDialog C`_D{r  
{ 5F+ f'~  
 // Construction !<PTsk F  
 public: Z6AU%3]  
  BOOL bTray; PWD]qtr  
  BOOL bRegistered; :8L61d2(  
  BOOL RegisterHotkey(); gV44PI6h  
  UCHAR cKey; 9*Twx&  
  UCHAR cMask; m1; <T@  
  void DeleteIcon(); E|uXi)!.x  
  void AddIcon(); \*"0wR;[K  
  UINT nCount; 4sE=WPKF#  
  void SaveBmp(); -^ ayJ73  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor $I0a2Z=dP  
  // Dialog Data N)y;owgo  
  //{{AFX_DATA(CCaptureDlg) l YA+k5  
  enum { IDD = IDD_CAPTURE_DIALOG }; %|* y/m  
  CComboBox m_Key; #YVDOR{z  
  BOOL m_bControl; 1;[ <||K  
  BOOL m_bAlt; '0M0F'R  
  BOOL m_bShift; juYt =  
  CString m_Path; $/#)  
  CString m_Number; uOUw8  
  //}}AFX_DATA 2}\sj'0&  
  // ClassWizard generated virtual function overrides ^B=z_0 *  
  //{{AFX_VIRTUAL(CCaptureDlg) (y4Eq*n%!  
 public: \mit&EUh}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); I,?LZ_pK  
 protected: AG%es0D[H  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4IE#dwZW  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); { 3P!b|V>  
  //}}AFX_VIRTUAL 2qR@: ^  
  // Implementation 62'0)Cy^  
 protected: by ee-BU  
  HICON m_hIcon; F+-MafN7Y  
  // Generated message map functions 2p.+C35c=j  
  //{{AFX_MSG(CCaptureDlg) -;.fU44O[#  
  virtual BOOL OnInitDialog(); }(O kl1  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1L9 <1  
  afx_msg void OnPaint(); EHJc*WFPU-  
  afx_msg HCURSOR OnQueryDragIcon(); iv`-)UsE  
  virtual void OnCancel(); o |.me G  
  afx_msg void OnAbout(); b|'LtL$Y  
  afx_msg void OnBrowse(); *hgsS~  
  afx_msg void OnChange(); n{* [Y  
 //}}AFX_MSG g@i 4H[k  
 DECLARE_MESSAGE_MAP() NPq2C8:  
}; oYm"NDS_.  
#endif $k=rd#3  
Du4?n8 o  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file B|w}z1.  
#include "stdafx.h" $jL.TraV7  
#include "Capture.h" uty]-k   
#include "CaptureDlg.h" L )"w-,zy  
#include <windowsx.h> 2a}_|#*  
#pragma comment(lib,"hook.lib") @WUCv7U  
#ifdef _DEBUG Gwk@X/q  
#define new DEBUG_NEW 7cSvAX0Z.  
#undef THIS_FILE 0drc^rj !  
static char THIS_FILE[] = __FILE__; >CA1Ub&ls  
#endif 9{&x-ugM  
#define IDM_SHELL WM_USER+1 49>yIuG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .^W0;ISX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p{u}t!`!d  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; E_*T0&P.P  
class CAboutDlg : public CDialog a MD?^  
{ $(hZw  
 public: L(YT6Vmm+t  
  CAboutDlg(); 32J  
  // Dialog Data r8E!-r}rno  
  //{{AFX_DATA(CAboutDlg) I!%@|[ Ow  
  enum { IDD = IDD_ABOUTBOX }; `Q[$R&\  
  //}}AFX_DATA e=C,`&s z  
  // ClassWizard generated virtual function overrides ]vG)lY.=  
  //{{AFX_VIRTUAL(CAboutDlg) [#V! XdQ,  
 protected: 3 g!h4?^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {<Zqw]  
  //}}AFX_VIRTUAL oOw"k*,h:S  
  // Implementation B W1O1zIh\  
 protected: v7RDoO]I  
  //{{AFX_MSG(CAboutDlg) TR;-xst@  
  //}}AFX_MSG svII =JB  
  DECLARE_MESSAGE_MAP() Xp@OIn  
}; .- o,_eg1f  
p_5+L@%Gb  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ={d\zjI$  
{ >m46tfoM  
 //{{AFX_DATA_INIT(CAboutDlg) 06r cW `  
 //}}AFX_DATA_INIT IrK )N  
} Z%{2/mQ  
'1IH^<b  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) i;7jJ(#V  
{ l$NEx0Dffz  
 CDialog::DoDataExchange(pDX); e;v2`2z2  
 //{{AFX_DATA_MAP(CAboutDlg) gne c#j  
 //}}AFX_DATA_MAP qyC"}y-  
} [ ff.R  
jKs8i$q  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) C8-q<t#SF  
 //{{AFX_MSG_MAP(CAboutDlg) L T!X|O.  
 // No message handlers 2^:nlM{u  
 //}}AFX_MSG_MAP fz\Az-  
END_MESSAGE_MAP() ?z.`rD$}(n  
l K%Hb=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) a$-ax[:\sm  
: CDialog(CCaptureDlg::IDD, pParent) pQ JZE7S  
{ W@LR!EW)  
 //{{AFX_DATA_INIT(CCaptureDlg) gfHlY Q]  
  m_bControl = FALSE; 0 $r{h}[^c  
  m_bAlt = FALSE; 3Hr%G4  
  m_bShift = FALSE; qx NV~aK  
  m_Path = _T("c:\\"); "O{sdVS  
  m_Number = _T("0 picture captured."); s4\2lBU?  
  nCount=0; 6{ Eh={:b  
  bRegistered=FALSE; 0o`o'ZV=c  
  bTray=FALSE; /6fsh7 \  
 //}}AFX_DATA_INIT xMu6PM<l  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -`JY] H  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); N_U D7P1  
} nDfDpP&  
?M);wBe(  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -b<+Ra  
{ 1{qg@xlj  
 CDialog::DoDataExchange(pDX); Y2fs$emv  
 //{{AFX_DATA_MAP(CCaptureDlg) A}o1I1+  
  DDX_Control(pDX, IDC_KEY, m_Key); p_( NLJ%  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  lwlR"Z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Wh7nli7f_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); |b'AWI81D  
  DDX_Text(pDX, IDC_PATH, m_Path); CEiG jo^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); f3O'lc3  
 //}}AFX_DATA_MAP }OZfsYPz}T  
} d p].FS  
qp8;=Nfa  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +a{>jzR  
//{{AFX_MSG_MAP(CCaptureDlg) pbNVj~#6  
 ON_WM_SYSCOMMAND() 2P*O^-zRp  
 ON_WM_PAINT()  }#1g;  
 ON_WM_QUERYDRAGICON() i@6 kI C  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) uQ}kq7gd  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) : s35{K  
 ON_BN_CLICKED(ID_CHANGE, OnChange) /T0|<r!c  
//}}AFX_MSG_MAP 5 X rn]  
END_MESSAGE_MAP() DuaOi1Gw  
Gvwel!6  
BOOL CCaptureDlg::OnInitDialog() H'0S;A+Y6  
{ !nVuvsbv  
 CDialog::OnInitDialog(); }j QwP3eY  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); QH eUpJ/^  
 ASSERT(IDM_ABOUTBOX < 0xF000); u<[Y6m  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  _~r>C  
 if (pSysMenu != NULL) fjf\/%  
 { *e=e7KC6kI  
  CString strAboutMenu; RN;Tqq):  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 6K6ihR!d  
  if (!strAboutMenu.IsEmpty()) 4^ A\w  
  { H~&'`h1  
   pSysMenu->AppendMenu(MF_SEPARATOR); !^%b|=[  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %%#zO Z  
  } 5E]I  
 } %NuS!v>  
 SetIcon(m_hIcon, TRUE); // Set big icon Sn0 Gw  
 SetIcon(m_hIcon, FALSE); // Set small icon 7_LE2jpC,5  
 m_Key.SetCurSel(0); Lgy}Gm8u5  
 RegisterHotkey(); }6\p7n  
 CMenu* pMenu=GetSystemMenu(FALSE); t_3XqjuA  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); P<U{jkM\/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); FRr<K^M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); i4l?q#X  
 return TRUE; // return TRUE unless you set the focus to a control 6w' ^,V  
} D0~mu{;c$  
aV1(DZ83  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) MQ01!Y[q_7  
{ 4GJsVA(d|  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +'l@t bP  
 { h c "n?  
  CAboutDlg dlgAbout; 3OTSLF/  
  dlgAbout.DoModal(); #'8E%4  
 } 6<2 7}S  
 else AO/R 2a(:  
 { +%0+  
  CDialog::OnSysCommand(nID, lParam); 8ARpjYZP  
 } Q~`n%uYg\{  
} Oo,<zS=ICk  
Pp?J5HW  
void CCaptureDlg::OnPaint() N. uw2Y%  
{ [b`k\~N4r  
 if (IsIconic()) yZ K j>P1  
 { 6+>q1,<  
  CPaintDC dc(this); // device context for painting Gk<h_1WWK  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); D(y=0),  
  // Center icon in client rectangle [/I4Pe1Yj%  
  int cxIcon = GetSystemMetrics(SM_CXICON); arnu|paw  
  int cyIcon = GetSystemMetrics(SM_CYICON); n@xU5Q  
  CRect rect; 0@z78h=h  
  GetClientRect(&rect); Al! P=h  
  int x = (rect.Width() - cxIcon + 1) / 2; 1L3L!@  
  int y = (rect.Height() - cyIcon + 1) / 2; mwBOhEefNJ  
  // Draw the icon `.@N9+Aj  
  dc.DrawIcon(x, y, m_hIcon); Y?Xs Z  
 } X\_ku?]v  
 else R/iXO~/"J  
 { SH"O<c Dp  
  CDialog::OnPaint(); jZ)1]Q2  
 } {'JoVJKv  
} v~j21`  
|]V0sgpoZ  
HCURSOR CCaptureDlg::OnQueryDragIcon() \S _ycn  
{ (@]{=q<  
 return (HCURSOR) m_hIcon; ~G"5!,J  
} YOqBIbp~&)  
!-[e$?-  
void CCaptureDlg::OnCancel() Rb?6N  
{ a *>$6H;  
 if(bTray) 'z@(,5  
  DeleteIcon(); ?EdF&^[3rD  
  CDialog::OnCancel(); JPRl/P$  
} -(P"+g3T  
HI55):Eb  
void CCaptureDlg::OnAbout() ka655O/)&  
{ #49,7OBU  
 CAboutDlg dlg; JpN+'/  
 dlg.DoModal(); &W*9'vSm.  
} 0I1bY]*  
E`$d!7O  
void CCaptureDlg::OnBrowse() =98@MX%P  
{ [+UF]m%W  
 CString str; |-bAz t  
 BROWSEINFO bi; "??$yMW  
 char name[MAX_PATH]; 46sV\In>?  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); THC34u]  
 bi.hwndOwner=GetSafeHwnd(); J'W6NitMr  
 bi.pszDisplayName=name; w(0's'  
 bi.lpszTitle="Select folder"; h?jKq2`  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ar }F^8Ku  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); +TL5yuA  
 if(idl==NULL) (U4]d`  
  return; !c/G'se  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #A+ dj| b  
 str.ReleaseBuffer(); (V 5_q,2  
 m_Path=str; D}OvD |<-  
 if(str.GetAt(str.GetLength()-1)!='\\') <7-3j{065  
  m_Path+="\\"; 4vC { G.  
 UpdateData(FALSE); A@4sb W_  
} |bA\>%~  
3U^E<H  
void CCaptureDlg::SaveBmp() Xf(H_&K  
{ g m'8,ZL  
 CDC dc; #!qa#.Yi  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Xgou7x<  
 CBitmap bm; 3w6}%=)$8  
 int Width=GetSystemMetrics(SM_CXSCREEN); R1)v;^B|)  
 int Height=GetSystemMetrics(SM_CYSCREEN); :+06M@  
 bm.CreateCompatibleBitmap(&dc,Width,Height); [f 4Nq \i  
 CDC tdc; 7S|nn|\Kp  
 tdc.CreateCompatibleDC(&dc); ' GcN9D  
 CBitmap*pOld=tdc.SelectObject(&bm); =f4>vo}@k  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); teIUSB[  
 tdc.SelectObject(pOld); 8`M) r'5  
 BITMAP btm; 2N B/&60<  
 bm.GetBitmap(&btm); (= #EJB1(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; j#6@ cO'`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 2[zFKK  
 BITMAPINFOHEADER bih; 5 FKb7  
 bih.biBitCount=btm.bmBitsPixel; #l2KJ7AMK  
 bih.biClrImportant=0; CEzwI _  
 bih.biClrUsed=0; |1!RvW:[!  
 bih.biCompression=0; [TRHcz n  
 bih.biHeight=btm.bmHeight; ai0am  
 bih.biPlanes=1; Q*&k6A"jx  
 bih.biSize=sizeof(BITMAPINFOHEADER); hhRUC&Y%V  
 bih.biSizeImage=size; -y]e`\+[  
 bih.biWidth=btm.bmWidth; u4hC/!  
 bih.biXPelsPerMeter=0; ;d5d$Np@m&  
 bih.biYPelsPerMeter=0; vf^`'  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); xO3-I@  
 static int filecount=0; f_'#wc6  
 CString name; $^~dqmE2,  
 name.Format("pict%04d.bmp",filecount++); w8~B@}%  
 name=m_Path+name; FK ? g  
 BITMAPFILEHEADER bfh; \+3amkBe  
 bfh.bfReserved1=bfh.bfReserved2=0; d^pzMaCI  
 bfh.bfType=((WORD)('M'<< 8)|'B'); .Aj4?AXWc  
 bfh.bfSize=54+size; H+lBb$  
 bfh.bfOffBits=54; O7,)#{  
 CFile bf; &-.NkW@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ HX}9;O  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); f i#p('8  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @~g][O#Fu  
  bf.WriteHuge(lpData,size); Ry_"sow4  
  bf.Close(); ey!QAEg"X1  
  nCount++; I.'(n8*  
 } df9 jT?l  
 GlobalFreePtr(lpData); ~&{LMf  
 if(nCount==1) xWR<>Og.  
  m_Number.Format("%d picture captured.",nCount); A-S!Z2m\  
 else  a>6@1liT  
  m_Number.Format("%d pictures captured.",nCount); mLGbwm'K  
  UpdateData(FALSE); >_esLsPWh]  
} "Zr+>a  
!N"Y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) C[c^zn  
{ W[BwHNxyg  
 if(pMsg -> message == WM_KEYDOWN) K-X@3&X}  
 { Q&\(m[:)  
  if(pMsg -> wParam == VK_ESCAPE) ku*H*o~  
   return TRUE; 'j&+Pg)@  
  if(pMsg -> wParam == VK_RETURN) ^(79SOZC  
   return TRUE; pA?kv]l(  
 } Yl\p*j"Fid  
 return CDialog::PreTranslateMessage(pMsg); .0=VQU  
} mssCnr;  
u"hv _ml  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) SyL:=NZ  
{ ']Z1nb  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ $*-UY  
  SaveBmp(); &GKtD)  
  return FALSE; V =9  
} jt5:rWB  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ OUM^ u*  
 CMenu pop; MqKf'6z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); D2N<a=#  
 CMenu*pMenu=pop.GetSubMenu(0); 'cgB$:T}.,  
 pMenu->SetDefaultItem(ID_EXITICON); YZ\a#s ,0  
 CPoint pt; QtSJ9;eP  
 GetCursorPos(&pt); ZkA05wPZ#  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0cF +4,5  
 if(id==ID_EXITICON) P[L] S7FTr  
  DeleteIcon(); ^E]Xq]vd"  
 else if(id==ID_EXIT) e<Bw duy  
  OnCancel(); og$%`o:{  
 return FALSE; jXH?os%  
} 1^v?Ly8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Z)qts=  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 9jkaEn>m^  
 AddIcon(); =sFLzAu8  
 return res; (6g;FD:"6  
} ,RXfJh  
+ $Yld{i  
void CCaptureDlg::AddIcon() F<9S,  
{ IVY{N/ 3|  
 NOTIFYICONDATA data; 3q}fDM(@J  
 data.cbSize=sizeof(NOTIFYICONDATA); rb_FBa%  
 CString tip; zt3y5'Nk  
 tip.LoadString(IDS_ICONTIP); pVN) k  
 data.hIcon=GetIcon(0); (U?*Z/  
 data.hWnd=GetSafeHwnd(); Bk44 wz2 X  
 strcpy(data.szTip,tip); (^lw<$N  
 data.uCallbackMessage=IDM_SHELL; j84g6;4Dv  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #Y>os3]  
 data.uID=98; I7C*P~32{n  
 Shell_NotifyIcon(NIM_ADD,&data); RX\l4H5;  
 ShowWindow(SW_HIDE); 8n'"RaLQ8  
 bTray=TRUE; d&G#3}kOb%  
} \g;o9}@3~  
f#>ubmuI^  
void CCaptureDlg::DeleteIcon() 31-:xUIX  
{ w+_pq6\V  
 NOTIFYICONDATA data; ]/cVlpZ{f  
 data.cbSize=sizeof(NOTIFYICONDATA); N3U.62  
 data.hWnd=GetSafeHwnd(); n 97pxD_74  
 data.uID=98; WAzn`xGxR"  
 Shell_NotifyIcon(NIM_DELETE,&data); -ufO,tJRLL  
 ShowWindow(SW_SHOW); a}p}G\b|  
 SetForegroundWindow(); >Y>>lE! k  
 ShowWindow(SW_SHOWNORMAL); =[Z uE0c  
 bTray=FALSE; TQ`4dVaf  
} `=QRC.b  
&)Z!A*w]  
void CCaptureDlg::OnChange() K3I|d;Y~X!  
{ vw5f|Q92  
 RegisterHotkey(); l =`?Im  
} tgpg  
%HWebZ-yY  
BOOL CCaptureDlg::RegisterHotkey() 4Rv.m* ^B  
{ 3@*orm>em  
 UpdateData(); +$SJ@IH[<  
 UCHAR mask=0; *p  !F+"  
 UCHAR key=0; DnI31!+y  
 if(m_bControl)  G9qN1q~  
  mask|=4; EmFL %++V  
 if(m_bAlt) -:]-g:;/  
  mask|=2; =ICakh!TO  
 if(m_bShift) ;D>*Pzj  
  mask|=1; !kG2$/lR  
  key=Key_Table[m_Key.GetCurSel()]; Jv[c?6He  
 if(bRegistered){ ?ypX``3#s7  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 93]67PL#+  
  bRegistered=FALSE; ]hHL[hoFC  
 } 9esMr0*=  
 cMask=mask; W! =X _  
 cKey=key; xZc].l6  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); X8uAwHa6F  
 return bRegistered; y(92Th$  
} \LbBK ~l-I  
VX{9g#y$j  
  四、小结 1RM@~I$0  
Smc=-M}  
  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
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八