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用Visual C++实现屏幕抓图程序

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 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: !Ub?eJp  
  *1)NABp6D  
  一、实现方法 T4}?w  
TnU$L3k  
  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: ^)IL<S&h  
5B.??;xtaV  
#pragma data_seg("shareddata") W7[ S7kd  
HHOOK hHook =NULL; //钩子句柄 $9_.Q/9>  
UINT nHookCount =0; //挂接的程序数目 $}UJs <-F  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ihBl",l&Hq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 <:{[Zvl'k  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?a0}^:6  
static int KeyCount =0; +e]b,9.sR  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 +$= Wms-z  
#pragma data_seg() OYtus7q<  
WZ6{(`;#m  
  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。 &'yV:g3H  
<[5${)  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: \HQb#f,  
Y&Lk4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR WfbNar[  
cKey,UCHAR cMask) W>|b98NPu  
{ 3Q~&xNf  
 BOOL bAdded=FALSE; P_lcX;O  
 for(int index=0;index<MAX_KEY;index++){ >T*g'954xF  
  if(hCallWnd[index]==0){ n`KXJ?t  
   hCallWnd[index]=hWnd; |AfQ_iT6c  
   HotKey[index]=cKey; boOw K?  
   HotKeyMask[index]=cMask; g~H? l3v  
   bAdded=TRUE; ~m|?! ]n  
   KeyCount++; 0?Wf\7  
   break; PRlo"kN  
  } x0;}b-f  
 } Z%9^6kdY  
 return bAdded; dVt@D&  
} +95dz?~  
//删除热键 %y7wF'_Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ftqW3VW  
{ R:R@sU  
 BOOL bRemoved=FALSE; -*q2Y^A^l  
 for(int index=0;index<MAX_KEY;index++){ bfI -!,  
  if(hCallWnd[index]==hWnd){ u R%R]X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }0nB' 0|y  
    hCallWnd[index]=NULL; _r5Ild @n  
    HotKey[index]=0; (@o />T  
    HotKeyMask[index]=0; }qdJ8K  
    bRemoved=TRUE; LXF%~^^@d  
    KeyCount--; j6HbJ#]  
    break; yaXa8v'oC  
   } # +]! u%n  
  } V1>94/waa  
 } *Z2Q]?:{ i  
 return bRemoved; nkj'AH"2  
} 842+KLS  
2b,TkG8K  
@Be:+01z  
  DLL中的钩子函数如下: aw"%B-N \  
RTY4%6]O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7%!KAtc  
{ hPpXB:(-0  
 BOOL bProcessed=FALSE; ;k%sKVP  
 if(HC_ACTION==nCode) HPdwx V  
 { y8S6ZtA}2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 q<uLBaL_]r  
   switch(wParam) <~X6D?  
   {  +<WT$ddK=5  
    case VK_MENU: ^k<$N  
     MaskBits&=~ALTBIT; .u;TeP  
     break; ;H r@0f  
    case VK_CONTROL: ,:4w$!;  
     MaskBits&=~CTRLBIT; }UdqX1jz  
     break; E d/O\v@  
    case VK_SHIFT: _NnO mwK7  
     MaskBits&=~SHIFTBIT; H 7F~+ Q-}  
     break; o5 XUDDi  
    default: //judge the key and send message uPv?Hq  
     break; SfFR  
   } F^G`Jf  
   for(int index=0;index<MAX_KEY;index++){ DmPsltpzQ  
    if(hCallWnd[index]==NULL) 64X#:t+  
     continue; c qyh#uWe  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [ =2In;  
    { 7Ej#7\TB]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); L5uI31  
     bProcessed=TRUE; 3'e 4{  
    } D?F5o^e"h<  
   } m8^2k2  
  } H=RV M  
  else if((lParam&0xc000ffff)==1){ //有键按下 &D w~Jq|  
   switch(wParam) ]~Qkg+>'&  
   { /iuNdh  
    case VK_MENU: GZX!iT  
     MaskBits|=ALTBIT; ~(]DNXB8I`  
     break; ,ToEK Id  
    case VK_CONTROL: 8HA=O ?Cg  
     MaskBits|=CTRLBIT; j5^b~F%  
     break; M':.b+xN  
    case VK_SHIFT: ZSt ww{Z  
     MaskBits|=SHIFTBIT; B8Zd#.6]  
     break; *bSG48W("  
    default: //judge the key and send message ~At.V+  
     break; 'oL[rO~j  
   } Li^!OHro.  
   for(int index=0;index<MAX_KEY;index++){ c6)zx b  
    if(hCallWnd[index]==NULL) kxwm08/|f  
     continue; 97dI4 t<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YDD]n*&  
    { ADz|Y~V!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +[[gU;U"v  
     bProcessed=TRUE; hzo,.hS's  
    } :/l   
   } 1&"1pH  
  } 0^Cx`xdX:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 S c Kfr  
   for(int index=0;index<MAX_KEY;index++){ tb\pjLB][  
    if(hCallWnd[index]==NULL) 8!>pFVNJf  
     continue; 6D(m8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,sl.:C4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6 74X)hB  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Qf]!K6eR  
   } FQ)Ekss~C  
  } ".<p R} qp  
 } gNQJ:!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }!Lr!eALr  
} h!~yYNQ"  
!:{_<C"D  
  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: ksp':2d}  
0pOha(,~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `VN<6o(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?%ntO]  
x=N;>  
  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: @R{&>Q:.  
cEu98nP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) cfS]C_6d  
{ nHjwT5Q+Q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) gMn)<u>  
 { jQ}| ]pj+  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 sTyGi1  
  SaveBmp(); /^G+vhlf\  
  return FALSE; $7YLU{0  
 } _Y {g5t  
 …… //其它处理及默认处理 rID]!7~  
} gHshG;z*  
{Aw3Itef  
RUu'9#fq  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 nQ~L.V  
3om-,gfZ  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 .R5z>:A  
j(JI$  
  二、编程步骤 E}2[P b)e  
h+(s/o?\  
  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"; 7RJW  
< *OF  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; LL+rd xJO^  
6suc:rp";  
  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; 7Y:s6R|  
N>Y3[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; iwJgU b  
^)~M,rW8c  
  5、 添加代码,编译运行程序。 v^ G5 N)F  
?VsZo6Z"  
三、程序代码 +%v4Ci"%y  
;7>--_?=  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL S(l^TF  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \gpKQt0  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ |\t_I~de  
#if _MSC_VER > 1000 0=&]!WRT  
#pragma once l/LUwDI{  
#endif // _MSC_VER > 1000 H#E0S>Jw|  
#ifndef __AFXWIN_H__ Nl _Jp:8s  
#error include 'stdafx.h' before including this file for PCH lc7]=,qyF  
#endif qa0Zgn5q  
#include "resource.h" // main symbols H l@rS  
class CHookApp : public CWinApp b}*hodzF  
{ f *vziC<m  
 public: v%^H9aK_  
  CHookApp(); Fu$sfq  
  // Overrides l1 S1CS  
  // ClassWizard generated virtual function overrides 04t_  
  //{{AFX_VIRTUAL(CHookApp) .O^|MhBJu  
 public: /o2eKx  
  virtual BOOL InitInstance(); w?q"%F;/  
  virtual int ExitInstance(); 3Y8 V?* 1|  
  //}}AFX_VIRTUAL Kw|`y %~  
  //{{AFX_MSG(CHookApp) VK#zmEiB  
  // NOTE - the ClassWizard will add and remove member functions here. u 6+  
  // DO NOT EDIT what you see in these blocks of generated code ! x!+ a,+G  
  //}}AFX_MSG PdZSXP4;k  
  DECLARE_MESSAGE_MAP() p\K5B,  
}; *#_jTwQe  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1Rh&04O>VL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C#R9Hlb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b+>godTi_  
BOOL InitHotkey(); sBwgl9  
BOOL UnInit(); mfvQ]tz_+  
#endif ZSNg^)cN  
T$e_ao|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Lnzhs;7L  
#include "stdafx.h" `*a,8M%  
#include "hook.h" s5HbuyR^  
#include <windowsx.h> :lAR;[WFS  
#ifdef _DEBUG ]nh)FMo  
#define new DEBUG_NEW wHmEt ORo  
#undef THIS_FILE M<nn+vy`  
static char THIS_FILE[] = __FILE__; Syk^7l  
#endif P_gQ-pF.  
#define MAX_KEY 100 :vjbuqN]  
#define CTRLBIT 0x04 '};Xb|msU  
#define ALTBIT 0x02 0/Csc\Xl  
#define SHIFTBIT 0x01 cQny)2k*x  
#pragma data_seg("shareddata") /[OMpP  
HHOOK hHook =NULL; OX"`VE  
UINT nHookCount =0; R+\5hI@ >i  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey };*5+XY^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ]%."  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey RwE]t$T/  
static int KeyCount =0; \3l;PY  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ZD/!C9:&.0  
#pragma data_seg() ;p/@tr9  
HINSTANCE hins; 8c9_=8vw  
void VerifyWindow(); &Ru6Yt0W  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) d={}a,3?  
//{{AFX_MSG_MAP(CHookApp) V;!D:N8<  
// NOTE - the ClassWizard will add and remove mapping macros here. E=y#~W  
// DO NOT EDIT what you see in these blocks of generated code! ll#PCgIm  
//}}AFX_MSG_MAP z)26Ahm TV  
END_MESSAGE_MAP() ]mp.KvB  
D|xSO~M5  
CHookApp::CHookApp() ~LVa#  
{ SG~R!kN}Q  
 // TODO: add construction code here, >g?,BK@  
 // Place all significant initialization in InitInstance +#W5Qb}VR  
} B 5?(gb"  
vq{:=:5'P  
CHookApp theApp; DeUDZL%/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ukw'$Yt2  
{ Kl* ##qw!  
 BOOL bProcessed=FALSE; gnv4.f:  
 if(HC_ACTION==nCode) Zy'bX* s|  
 { c[5>kQ-nq  
  if((lParam&0xc0000000)==0xc0000000){// Key up W46sKD;\^W  
   switch(wParam) yY1&h op  
   { qRU8uu   
    case VK_MENU: /XXW4_>  
     MaskBits&=~ALTBIT; 1}(g=S  
     break; 8Hhe&B  
    case VK_CONTROL: y]/{W}D  
     MaskBits&=~CTRLBIT; ?.T=(-  
     break; V3jx{BXs2  
    case VK_SHIFT: 03,+uf  
     MaskBits&=~SHIFTBIT; Sh"} c2  
     break; NE(6`Wq`  
    default: //judge the key and send message '?-GZ0oM  
     break; Y A;S'dxY  
   } c<e$6:|xM  
   for(int index=0;index<MAX_KEY;index++){ [P[syi#]t  
    if(hCallWnd[index]==NULL) Bdq/Ohw|!  
     continue; t?/#:J*_7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?^yZVmAo]  
    { u~G,=n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kcQ |Zg  
     bProcessed=TRUE; %N!Y}$y  
    } Qd@`jwjS  
   } md<%Z4+  
  } Nf3L  
  else if((lParam&0xc000ffff)==1){ //Key down ?bbguwo~F  
   switch(wParam) & K7+V  
   { VDscZt)y8  
    case VK_MENU: B=9|g1e  
     MaskBits|=ALTBIT; x5{ zGv.j  
     break; '*22j ]  
    case VK_CONTROL: {+Eq{8m`  
     MaskBits|=CTRLBIT; Xmtq~}K>  
     break; Jln dypE  
    case VK_SHIFT: +HNQ2YZ  
     MaskBits|=SHIFTBIT; \p.ku%{  
     break; #S QFI;zj  
    default: //judge the key and send message w(s"r p}  
     break; (/c9v8Pr(7  
   } z )k\p'0"  
   for(int index=0;index<MAX_KEY;index++) _t3n<  
   { (0^u  
    if(hCallWnd[index]==NULL) %<K`d  
     continue; #Ey!?Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) MLaH("aen  
    { DaaLRMQ=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Haiuf)a  
     bProcessed=TRUE; entO"~*EX  
    } 'R?;T[s%  
   } +K]kGF  
  } 2{g~6 U.  
  if(!bProcessed){ N }Z"$4  
   for(int index=0;index<MAX_KEY;index++){ Q+gQ"l,95  
    if(hCallWnd[index]==NULL) P)ZGNtO9fG  
     continue; mM1\s>o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1+v)#Wj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -bduB@#2d  
   } W8R@Pf  
  } JT,8/o  
 } @~xNax&^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4Rp2  
} u:NSPAD)  
D8qZh1w%A|  
BOOL InitHotkey() p'uk V(B  
{ ~~]L!P  
 if(hHook!=NULL){ Zm^4p{I%o*  
  nHookCount++; p.n+m[  
  return TRUE; CUaI66  
 } H~e;S#3_v  
 else A#\NVN8sk  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ZV$qv=X  
  if(hHook!=NULL) Y FL9Q<  
   nHookCount++; -P^ 6b(  
  return (hHook!=NULL); 1nye.i~  
} EQET:a:g  
BOOL UnInit() 8.ll]3))  
{ ^?VYE26  
 if(nHookCount>1){ bO^#RVH  
  nHookCount--; CfNHv-jDL  
  return TRUE; HY4X;^hF  
 } DP6M4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ]'3e#Cqeh  
 if(unhooked==TRUE){ y+hC !-  
  nHookCount=0; za `  
  hHook=NULL; DDsU6RyN  
 } Q-k{Lqa-  
 return unhooked; : " 9F.U  
} T \5 5uQ  
W2e~!:w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) o}C|N)'  
{ @kw#\%Uz  
 BOOL bAdded=FALSE; 7aUk?Hf  
 for(int index=0;index<MAX_KEY;index++){ T0J"Wr>WY  
  if(hCallWnd[index]==0){ i Tg?JoE2  
   hCallWnd[index]=hWnd; `j{q$Y=AG  
   HotKey[index]=cKey; n7>CK?25  
   HotKeyMask[index]=cMask; NHG+l)y:  
   bAdded=TRUE; g .ty#Z=:  
   KeyCount++; 9tvLj5~  
   break; Z[[ou?c  
  } (\}>+qS[  
 } .>NhC"  
 return bAdded; J*?BwmD'8  
} # Y/ .%ch.  
&rj3UF@hb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) He^u+N@B  
{ 0vbiq  
 BOOL bRemoved=FALSE; RLBjl%Q>  
 for(int index=0;index<MAX_KEY;index++){ WX$mAQDV  
  if(hCallWnd[index]==hWnd){ WlVp|s{TYP  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O&YX V  
    hCallWnd[index]=NULL;  W|XTa  
    HotKey[index]=0; Z".mEF-b  
    HotKeyMask[index]=0; `oQ)qa_  
    bRemoved=TRUE; p_T>"v  
    KeyCount--;  yG -1g0  
    break; # ~SuL3  
   } |_ZD[v S  
  } Rd7[e^HSN  
 } 04>dxw)8  
 return bRemoved; \-3\lZ3qj  
} QB p`r#{I{  
PF5;2  
void VerifyWindow() 8Yfg@"Tn  
{ ljg2P5  
 for(int i=0;i<MAX_KEY;i++){ rrBu6\D  
  if(hCallWnd!=NULL){ r_/=iYYJ  
   if(!IsWindow(hCallWnd)){ C%P)_)- -V  
    hCallWnd=NULL; (`h$+p^-y  
    HotKey=0; q2v:lSFY  
    HotKeyMask=0; :.KN;+tP  
    KeyCount--; q0|u vt"  
   } r~ gjn`W  
  } R'bmE:nL  
 } I L dRN  
} 5c50F{  
i oCoFj  
BOOL CHookApp::InitInstance() jM`)N d  
{ rUZRYF4C  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); h'Tn&2r6  
 hins=AfxGetInstanceHandle(); O 1T JJ8  
 InitHotkey(); f+>l-6M+p  
 return CWinApp::InitInstance(); .KiJq:$H  
} _-/aMfyQ  
IHqY/j  
int CHookApp::ExitInstance() -"J6 |Y#8  
{ u{Jv6K,  
 VerifyWindow(); cBICG",TA  
 UnInit(); "-aak )7w  
 return CWinApp::ExitInstance(); 1 o<l;:  
} %ux%=@%  
b~F(2[o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {v&c5B~,\  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Q\(VQ1c  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ l5sBDiir%  
#if _MSC_VER > 1000 }1]E=!?)&  
#pragma once \QF\Bh  
#endif // _MSC_VER > 1000 rMDo5Z2  
9o-fI@9  
class CCaptureDlg : public CDialog G9?6qb:  
{ w k1O*_76  
 // Construction ]RYk Y7>`  
 public: -QH[gi{%`  
  BOOL bTray; C)^FRnb  
  BOOL bRegistered; u<8 f ;C_  
  BOOL RegisterHotkey(); ) V}q7\G~  
  UCHAR cKey; .54E*V1  
  UCHAR cMask; .ZSGnbJ  
  void DeleteIcon(); eF8!}|*N  
  void AddIcon(); u Qy5t:!  
  UINT nCount; -ya0!D  
  void SaveBmp(); ;K[ G]8  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \EH:FM}l,  
  // Dialog Data H^jFvAI,8  
  //{{AFX_DATA(CCaptureDlg) ?h`Ned0P  
  enum { IDD = IDD_CAPTURE_DIALOG }; z`gdE0@;d3  
  CComboBox m_Key; StUiL>9T#  
  BOOL m_bControl; 7mulNq  
  BOOL m_bAlt; bS 'a)  
  BOOL m_bShift; %qA +z Pf  
  CString m_Path; yQwj [  
  CString m_Number; A`4Di8'Me  
  //}}AFX_DATA |_l\.  
  // ClassWizard generated virtual function overrides } g  WSV  
  //{{AFX_VIRTUAL(CCaptureDlg) ?p{xt$<p  
 public: <j1l&H|ux,  
  virtual BOOL PreTranslateMessage(MSG* pMsg); G~ZDXQ>5CP  
 protected: # k+Gg w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9GnNL I{  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); cmDskQ:  
  //}}AFX_VIRTUAL K?')#%Z/{#  
  // Implementation RVN"lDGA  
 protected: gnbs^K w  
  HICON m_hIcon; db"FC3/H  
  // Generated message map functions &fYx0JT  
  //{{AFX_MSG(CCaptureDlg) _>HX Q6Hw  
  virtual BOOL OnInitDialog(); ~p~8T  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); OVO0Emv  
  afx_msg void OnPaint(); jIMaP T  
  afx_msg HCURSOR OnQueryDragIcon(); <[xxCW(2  
  virtual void OnCancel(); G8`q-B}q  
  afx_msg void OnAbout(); <\x/Y$jm0n  
  afx_msg void OnBrowse(); U{D ?1tF  
  afx_msg void OnChange(); Uq)|]a&e  
 //}}AFX_MSG DLE|ctzj[7  
 DECLARE_MESSAGE_MAP() "}D uAs  
}; Vn1kC  
#endif P ]2M  
zW%-Z6%D  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9>psQ0IRvr  
#include "stdafx.h" >q <,FY!A  
#include "Capture.h" v%> ?~`Y  
#include "CaptureDlg.h" oUZwZ_yKW  
#include <windowsx.h> ,oDZ:";  
#pragma comment(lib,"hook.lib")  DVD}  
#ifdef _DEBUG J{$C}8V  
#define new DEBUG_NEW 8E/$nRfO d  
#undef THIS_FILE c[<lr  
static char THIS_FILE[] = __FILE__; 7&NRE"?G  
#endif -w 2!k  
#define IDM_SHELL WM_USER+1 5@j?7%_8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r0QjCFSF=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]*}*zXN/E  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; jL 8&  
class CAboutDlg : public CDialog UuT>qWxQ8  
{ {^9,Dy_D  
 public: s;}';#  
  CAboutDlg(); 9{i6g+  
  // Dialog Data  ^]wm Y  
  //{{AFX_DATA(CAboutDlg) \UJ:PW$7  
  enum { IDD = IDD_ABOUTBOX }; wx(| $2{h  
  //}}AFX_DATA `]WU=Ss  
  // ClassWizard generated virtual function overrides *|$s0ga C  
  //{{AFX_VIRTUAL(CAboutDlg) (h/v"dV;  
 protected: o'myo.k{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }?*:uf  
  //}}AFX_VIRTUAL &z{oVU+mA  
  // Implementation aChY5R  
 protected: ZH_ J+  
  //{{AFX_MSG(CAboutDlg) '4HwS$mW3  
  //}}AFX_MSG w \0=L=J  
  DECLARE_MESSAGE_MAP() ICq;jfML  
}; PKdM-R'Z  
o [ar.+[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \C}tK,79  
{ 4x8mJ4[H^  
 //{{AFX_DATA_INIT(CAboutDlg) e[915Q_  
 //}}AFX_DATA_INIT sXoBw.^Ir_  
} 2c0eh-Gf  
_}jj>+zA`  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Gpe h#Q4x  
{ QHMXQyr(  
 CDialog::DoDataExchange(pDX); M%&`&{  
 //{{AFX_DATA_MAP(CAboutDlg) }kL% l  
 //}}AFX_DATA_MAP 9A B~*;U  
} BT d$n!'$n  
*PL+)2ob  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DKIDLf  
 //{{AFX_MSG_MAP(CAboutDlg)  +tfmBZl^  
 // No message handlers b)@D*plS&  
 //}}AFX_MSG_MAP #: ' P3)&  
END_MESSAGE_MAP() !6<2JNf  
^N Et{]x  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) P|HY=RM a  
: CDialog(CCaptureDlg::IDD, pParent) J9poqp@`MG  
{ HaB=nLAT  
 //{{AFX_DATA_INIT(CCaptureDlg) n{4&('NRFP  
  m_bControl = FALSE; P[XE5puC  
  m_bAlt = FALSE; tm+}@CM^.  
  m_bShift = FALSE; =\X<UA}  
  m_Path = _T("c:\\"); n6Q 3X  
  m_Number = _T("0 picture captured."); s)/i_Oe$\  
  nCount=0; B TcxBh  
  bRegistered=FALSE; u#J5M&#  
  bTray=FALSE; > )#*}JI  
 //}}AFX_DATA_INIT T'Jw\u>"R  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32  r) X?H  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \8Blq5n-O*  
} dhm ;  
xu+wi>Y^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) u{6*}6@fi  
{ /jj}.X7yH  
 CDialog::DoDataExchange(pDX); p' /$)klt  
 //{{AFX_DATA_MAP(CCaptureDlg) hCr7%`  
  DDX_Control(pDX, IDC_KEY, m_Key); >-)i_C2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |:H[Y"$1;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); D eXnE$XH  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); (x.K%QC)  
  DDX_Text(pDX, IDC_PATH, m_Path); _V8pDcY  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /}M@ @W  
 //}}AFX_DATA_MAP uE5kL{Fv  
} EWqKd/  
?c>j^}A/N  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) l'3NiIX  
//{{AFX_MSG_MAP(CCaptureDlg) 4qyL' \d[  
 ON_WM_SYSCOMMAND() |L`w4;  
 ON_WM_PAINT() :_Ng`b/  
 ON_WM_QUERYDRAGICON() CH9#<?l  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) fep#Kb%"e  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /3+7a\|mKr  
 ON_BN_CLICKED(ID_CHANGE, OnChange) TAzhD.6C  
//}}AFX_MSG_MAP |(S=G'AtU  
END_MESSAGE_MAP() /ebYk-c  
vZXyc *  
BOOL CCaptureDlg::OnInitDialog() ^$x^JM ]/  
{ _/MKU!\l  
 CDialog::OnInitDialog(); 'iL['4~.  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &p4q# p7,  
 ASSERT(IDM_ABOUTBOX < 0xF000); ] YQ*mvI]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); GD*6tk;5/  
 if (pSysMenu != NULL) 9B*SWWAj  
 { b(~NqV!i  
  CString strAboutMenu; u4.-AY {  
  strAboutMenu.LoadString(IDS_ABOUTBOX); J@yy2AZnO  
  if (!strAboutMenu.IsEmpty()) }A2@1TTPX  
  { =|?w<qc  
   pSysMenu->AppendMenu(MF_SEPARATOR); AK [9fxrE  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ADHe! [6q  
  } {}lw%d?A  
 } YTYYb#"Q  
 SetIcon(m_hIcon, TRUE); // Set big icon o.k#|q  
 SetIcon(m_hIcon, FALSE); // Set small icon g<{~f  
 m_Key.SetCurSel(0); = <33(   
 RegisterHotkey(); pK$^@~DE  
 CMenu* pMenu=GetSystemMenu(FALSE); teM&[U  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0BVMLRB  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); L {5zA5#m  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); M(/%w"R  
 return TRUE; // return TRUE unless you set the focus to a control ZC0F:=/K  
} [0IeEjL  
Ye(0'*-jyc  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) KQr=;O\T  
{ r*,]=M W  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1S_ KX.  
 { >xH3*0 Lp  
  CAboutDlg dlgAbout; J.O;c5wL  
  dlgAbout.DoModal(); 5Z;Py"%  
 } "pHQ  
 else t$UFR7XE  
 { JDMaLo  
  CDialog::OnSysCommand(nID, lParam); xp,H5 m%  
 } !TG"AW  
} 6|9];)  
wePMBL1P*  
void CCaptureDlg::OnPaint() +  ^~n09  
{ A 7TP1  
 if (IsIconic()) 2@A7i<p  
 { s!UC{)g,  
  CPaintDC dc(this); // device context for painting /+66y=`UJ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $v>- @  
  // Center icon in client rectangle zM)o^Fn2  
  int cxIcon = GetSystemMetrics(SM_CXICON); `d8$OC  
  int cyIcon = GetSystemMetrics(SM_CYICON); ]Q)TqwYF  
  CRect rect; G%4vZPA  
  GetClientRect(&rect); l?#([(WM  
  int x = (rect.Width() - cxIcon + 1) / 2; 0 J ANj  
  int y = (rect.Height() - cyIcon + 1) / 2; r2H]n.MT  
  // Draw the icon 9]kWM]B)o  
  dc.DrawIcon(x, y, m_hIcon); /j.V0%  
 } \WZ00Y,*  
 else HK ;C*;vC%  
 { sy]1Ba%  
  CDialog::OnPaint(); )|2g#hH5  
 } r)*KgGsk  
} ,"*[T\u  
3 vE;s"/  
HCURSOR CCaptureDlg::OnQueryDragIcon() i;Gl-b\_h  
{ mEE/Olh W  
 return (HCURSOR) m_hIcon; y+X%qTB  
} AMtFOXx%I  
33 N5>}  
void CCaptureDlg::OnCancel() bD49$N?>  
{ u6|7P<HUfb  
 if(bTray) "esV#%:#J  
  DeleteIcon(); iUSs)[]H>  
  CDialog::OnCancel(); *UEo&B2+  
} hX[hR  
]l&_Pv!!  
void CCaptureDlg::OnAbout() 3B;B#0g50  
{ |s s_<  
 CAboutDlg dlg; QvqX3FU  
 dlg.DoModal(); !&! sn"yD  
} 6h;$^3x$  
UG1^G07s  
void CCaptureDlg::OnBrowse() u*PN1E  
{ 2uqdx'^"  
 CString str; H%sbf& gi  
 BROWSEINFO bi; &o)j@5Y?  
 char name[MAX_PATH]; g3"`b)M  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |-Y,:sY:  
 bi.hwndOwner=GetSafeHwnd(); 4xg%OH  
 bi.pszDisplayName=name; _.\p^ HM  
 bi.lpszTitle="Select folder"; NlWIb2,  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; \}G/F!  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); D(L%fK`+  
 if(idl==NULL) C+2*m=r  
  return; E[ e ''  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); `) K1[&  
 str.ReleaseBuffer(); N<O^%!buR  
 m_Path=str; *Q5/d9B8TN  
 if(str.GetAt(str.GetLength()-1)!='\\') l"O=xt`m{  
  m_Path+="\\"; ~hz]x^:  
 UpdateData(FALSE); L# (o(4g2  
} G9^!= v@  
X@ jml$;$  
void CCaptureDlg::SaveBmp() lwjg57  
{ u'P@3'P  
 CDC dc; VxaJ[s3PQ&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); kM@8RAxA  
 CBitmap bm; 8'/vW~f  
 int Width=GetSystemMetrics(SM_CXSCREEN); K]Ed-Tz8QZ  
 int Height=GetSystemMetrics(SM_CYSCREEN); YHg4WW$  
 bm.CreateCompatibleBitmap(&dc,Width,Height); C\ 9eR  
 CDC tdc; uiO8F*,!&r  
 tdc.CreateCompatibleDC(&dc); qfG`H#cA<  
 CBitmap*pOld=tdc.SelectObject(&bm); MJDFm,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @K2q*d  
 tdc.SelectObject(pOld); #@ lLx?U  
 BITMAP btm; D1x~d<j  
 bm.GetBitmap(&btm); ={8ClUV#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )*$'e<?`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :Q!U;33aG  
 BITMAPINFOHEADER bih; >a@-OJ.yOk  
 bih.biBitCount=btm.bmBitsPixel; )1&[uE#L  
 bih.biClrImportant=0; ;v>2z!M  
 bih.biClrUsed=0; bi[vs|  
 bih.biCompression=0; JZ80|-c  
 bih.biHeight=btm.bmHeight; *G2p;n=2  
 bih.biPlanes=1; &5c)qap;n  
 bih.biSize=sizeof(BITMAPINFOHEADER); WVp14Z?k  
 bih.biSizeImage=size; O,XVA  
 bih.biWidth=btm.bmWidth; g$ 9Yfu  
 bih.biXPelsPerMeter=0; </Q<*@p?  
 bih.biYPelsPerMeter=0; ,in`JM<o  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); l}K {=%U>7  
 static int filecount=0; 'tp+g3V  
 CString name; s#-`,jqD  
 name.Format("pict%04d.bmp",filecount++); 57D /"  
 name=m_Path+name; %A:<rO85o  
 BITMAPFILEHEADER bfh; exZa:9 sp  
 bfh.bfReserved1=bfh.bfReserved2=0; +-K-CXt  
 bfh.bfType=((WORD)('M'<< 8)|'B'); YG!~v~sV  
 bfh.bfSize=54+size; oTT/;~I  
 bfh.bfOffBits=54; S'vrO}yU  
 CFile bf; ->$Do$  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ gz Qc  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7s1FJm=Y/  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )t&j0`Yq  
  bf.WriteHuge(lpData,size); $oe:km1-D  
  bf.Close(); R\ <HR9r  
  nCount++; ~ex1,J*}t  
 } 6# ,2  
 GlobalFreePtr(lpData); UC\CCDV#^  
 if(nCount==1) ?0Z?Z3)%w4  
  m_Number.Format("%d picture captured.",nCount); ST] h NM  
 else &mp=jGR  
  m_Number.Format("%d pictures captured.",nCount); ebp18_a|  
  UpdateData(FALSE); ixp(^>ZN  
} YN.rj-;^+  
)lBke*j~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .Hc]?R ]  
{ +Ae4LeVzc  
 if(pMsg -> message == WM_KEYDOWN) N'=8Dj  
 { UuzT*Y>  
  if(pMsg -> wParam == VK_ESCAPE) J *5 )g  
   return TRUE; %N=-i]+Id  
  if(pMsg -> wParam == VK_RETURN) fu"#C}{  
   return TRUE; z~UqA1r  
 } cxp>4[gH  
 return CDialog::PreTranslateMessage(pMsg); x?y)a9&Hm  
} hL+)XJu^J  
)Gh"(]-<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v&(PM{3o  
{ 71Q-_Hi  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Z9E[RD  
  SaveBmp(); ~bf-uHx  
  return FALSE; =hjff/ X  
} )C|[j@MD  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Fr`"XH  
 CMenu pop; \U\ W Q  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); s["8QCd"r  
 CMenu*pMenu=pop.GetSubMenu(0); x4r\cL1!  
 pMenu->SetDefaultItem(ID_EXITICON); [>U'P1@ql  
 CPoint pt; pIXbr($  
 GetCursorPos(&pt);  ") q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); LK-2e$1  
 if(id==ID_EXITICON) )Gi!wm>zvN  
  DeleteIcon(); 2g$PEwXe  
 else if(id==ID_EXIT) 96fbMP+7R  
  OnCancel(); 6F(;=iY8  
 return FALSE; ?suxoP%  
} /5b,&  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :* 4b,P  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) om@GH0o+  
 AddIcon(); Z@4 BTA  
 return res; ,qz$6oxh\  
} ...|S]a  
| :7O  
void CCaptureDlg::AddIcon() p2cwW/^V  
{ W|XW2`3p  
 NOTIFYICONDATA data; 0hVw=KDO9:  
 data.cbSize=sizeof(NOTIFYICONDATA); outAZy=R;  
 CString tip; Q`j!$r  
 tip.LoadString(IDS_ICONTIP); 0<d9al|J  
 data.hIcon=GetIcon(0); e%Rg,dX  
 data.hWnd=GetSafeHwnd(); OuWG.Za  
 strcpy(data.szTip,tip); 4! ]28[2B6  
 data.uCallbackMessage=IDM_SHELL; pN|BtrN{  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; efW<  
 data.uID=98; f*)8bZDD  
 Shell_NotifyIcon(NIM_ADD,&data); >r J9^rS  
 ShowWindow(SW_HIDE); l6] :Zcd0  
 bTray=TRUE; !6{; z/Hy  
} Gi]R8?M  
W@Et  
void CCaptureDlg::DeleteIcon() 0eP7efy  
{ <]1Z  
 NOTIFYICONDATA data; T?B753I  
 data.cbSize=sizeof(NOTIFYICONDATA); XRA RgWj  
 data.hWnd=GetSafeHwnd(); m?G@#[ l  
 data.uID=98; uJhB>/Og  
 Shell_NotifyIcon(NIM_DELETE,&data); v/gxQy+l  
 ShowWindow(SW_SHOW); &m<:&h& b  
 SetForegroundWindow(); di $\\ Ah  
 ShowWindow(SW_SHOWNORMAL); : E`/z@I  
 bTray=FALSE; 4}-{sS}MP  
} +||y/}1  
jRdmQ mTJ  
void CCaptureDlg::OnChange() *f<+yF{=A  
{ .S4c<pMap  
 RegisterHotkey(); Y=0D[o8  
} #2 Gy=GvV  
7-S?\:J  
BOOL CCaptureDlg::RegisterHotkey() %+gK5aVab  
{ %QYW0lE  
 UpdateData(); 2E7vuFH4c  
 UCHAR mask=0; Ilf;Q(*$>>  
 UCHAR key=0; w1>uD]  
 if(m_bControl) X$mCn#8m  
  mask|=4; %?  87#|  
 if(m_bAlt) `_"F7Czn  
  mask|=2; .l1uqCuB  
 if(m_bShift) "L ,)4v/J  
  mask|=1; % \N52  
  key=Key_Table[m_Key.GetCurSel()]; 8);G'7O  
 if(bRegistered){ iwM$U( 9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); J[0o 6  
  bRegistered=FALSE; .:dy  d  
 } R(.5Hs  
 cMask=mask; PqUjBP\  
 cKey=key; 1V/?p<A  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Z@sDxYt9  
 return bRegistered; X"hdCY%  
} =emcs%  
' 5tk0A  
  四、小结 q)N]*~  
~| CWy  
  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。
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