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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: LAe6`foW/  
  +|>kCtZH%  
  一、实现方法 d6sye^P  
{Fe[:\  
  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: -{vKus  
+V^;.P</  
#pragma data_seg("shareddata") oD1/{dRzj  
HHOOK hHook =NULL; //钩子句柄 1\rz%E  
UINT nHookCount =0; //挂接的程序数目 _M5|Y@XN-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 3K/MvNI>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^_5r<{7/ :  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey gH3vk $WS  
static int KeyCount =0; {LQ#y/H?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 y[_Q-   
#pragma data_seg() _8)*]-  
?r+-  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 {Z5nGG  
'W,jMju  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ,V:SN~P66+  
A;|D:;x3G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR %zw1}|s#z  
cKey,UCHAR cMask) >q1L2',pK  
{ -701j'q{  
 BOOL bAdded=FALSE; &&RimoIeo  
 for(int index=0;index<MAX_KEY;index++){ 0f>5(ek  
  if(hCallWnd[index]==0){ }HePZ{PLM  
   hCallWnd[index]=hWnd; Y6L ~K?  
   HotKey[index]=cKey; W$ 2C47i  
   HotKeyMask[index]=cMask;  3 +fp2  
   bAdded=TRUE; tWa) _y  
   KeyCount++; 8rS:5:Hi  
   break; X~,aNRy  
  } _v=SH$O+  
 } w+E,INd i  
 return bAdded; *6F[t.Or  
} Yv!a88+A8M  
//删除热键 E6gI,f/p0X  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]Y8<`;8/  
{ )Z?Ym.0/  
 BOOL bRemoved=FALSE; #@~+HC=  
 for(int index=0;index<MAX_KEY;index++){  *m,k(/>  
  if(hCallWnd[index]==hWnd){ Nf"r4%M<6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ oVe|M ss6  
    hCallWnd[index]=NULL; SHo$9+  
    HotKey[index]=0; /& +tf*  
    HotKeyMask[index]=0; ;^I*J:]  
    bRemoved=TRUE; s '\Uap  
    KeyCount--; p\ZNy\N^  
    break; vf%&4\ib  
   } Nyj( 0W  
  } 6@0OQb  
 } Fv<F}h?6  
 return bRemoved; CxG#"{&  
} 6WJ)by  
"Yj'oE% \  
:GP]P^M;G@  
  DLL中的钩子函数如下: ApV~( k)W  
~C`^6UQr/?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V<uR>TD(  
{ z]?N+NHOA  
 BOOL bProcessed=FALSE; l6 H|PR{  
 if(HC_ACTION==nCode) M`i\VG  
 { {I#]@,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 \EtQ5T*u  
   switch(wParam) a^zibPG  
   {  c%G{#}^2  
    case VK_MENU: $$5aUI:$~$  
     MaskBits&=~ALTBIT; c>Xs&_  
     break; <\ :Yk  
    case VK_CONTROL: gPsi  
     MaskBits&=~CTRLBIT; (l- ab2'  
     break; YccH+[X;  
    case VK_SHIFT: H'HA+q  
     MaskBits&=~SHIFTBIT; q $tUH)0  
     break; s`'{I8'p/  
    default: //judge the key and send message ?Yk.$90  
     break; =4PV;>X  
   } ~W+kiTsD?  
   for(int index=0;index<MAX_KEY;index++){ j=aI9p  
    if(hCallWnd[index]==NULL) DLMM/WJg@  
     continue; &*G #H~\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >kp?vK;'B  
    { \GZM&Zd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); QPg8;O  
     bProcessed=TRUE; fNt`?pW H  
    } {~s DYRX  
   } ~SF<,-Kg  
  } I3mGo  
  else if((lParam&0xc000ffff)==1){ //有键按下 lXiKY@R#  
   switch(wParam) sVv xHkt@  
   { ime\f*Fg  
    case VK_MENU: | >27 B  
     MaskBits|=ALTBIT; Z}l3l`h!  
     break; &6YIn|}  
    case VK_CONTROL: iS Gq!D  
     MaskBits|=CTRLBIT; SB|Qa}62  
     break; <_tT<5'[$u  
    case VK_SHIFT: D (m j7oB  
     MaskBits|=SHIFTBIT; ;y\IqiA{o  
     break; 4.=3M  
    default: //judge the key and send message cy3B({PLy  
     break; cK i m-  
   } X/2&!O  
   for(int index=0;index<MAX_KEY;index++){ }O^zl#  
    if(hCallWnd[index]==NULL) F,MO@&ue"  
     continue; f[a}aZ9)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ahOMCZF|  
    { ,Pjew%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `t9?=h!  
     bProcessed=TRUE; dEA6   
    } O6/f5  
   } X{'q24\F  
  } 0#&5.Gr)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [uq$5u  
   for(int index=0;index<MAX_KEY;index++){ V'T ,4  
    if(hCallWnd[index]==NULL) 7=WT69,&  
     continue; (>GK \=:<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,:H\E|XeBw  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); FUOI3  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 %$ Z7x\_  
   } T' &I{L33Y  
  } MIoEauf  
 } I`LuRl w  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $!(pF  
} Jjv=u   
M|qteo  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: H {k^S\K  
* %M3PTY\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ( ?{MEwHG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q=T&  
j|%HIF25  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: U,q\em R  
7C ,UDp|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .wu xoq  
{ w1#gOwA,$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?zVL;gVWA  
 { f[~L?B;_L  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;)e2 @'Agl  
  SaveBmp(); D-(w_$#  
  return FALSE; Z1Z1@2 T  
 } rKf-+6Na  
 …… //其它处理及默认处理 yA(K=?sq  
} kO{s^_qR^c  
,@3$X=),E  
[tA;l+Q\&  
  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。 ^__Dd)(  
yi%-7[*]=  
  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。 RYl>  
cwWodPNm  
  二、编程步骤 2e9es  
9Fm"ei  
  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"; e9[|!/./5  
5qoSEI-m  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; +H #U~p$  
F>[,zN  
  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; Ii_ojQP-z  
88h3|'*  
  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; ),!;| bh  
$.v5~UGb{\  
  5、 添加代码,编译运行程序。 #ap9Yoyk\  
e0@Y#7N62  
三、程序代码 [$"n^5_~  
J6G(_(d  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL B0WJ/)rK<  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .h5[Q/*h  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8o 0%@5M  
#if _MSC_VER > 1000 09kt[  
#pragma once h!:~f-@j4  
#endif // _MSC_VER > 1000 hk;7:G  
#ifndef __AFXWIN_H__ (BfgwC)  
#error include 'stdafx.h' before including this file for PCH Zg`Mz _?  
#endif S"k *6 U  
#include "resource.h" // main symbols OP|8Sk6 r  
class CHookApp : public CWinApp e-*.Ca  
{ ^=SD9V  
 public: `8>Py~  
  CHookApp(); 9*=W-v  
  // Overrides |{ PI102  
  // ClassWizard generated virtual function overrides ['*8IWg  
  //{{AFX_VIRTUAL(CHookApp) w{90`  
 public: QZhj b  
  virtual BOOL InitInstance(); g HbxgeL  
  virtual int ExitInstance(); njnDW~Snb  
  //}}AFX_VIRTUAL -7&Gi +]  
  //{{AFX_MSG(CHookApp) D<X.\})Md  
  // NOTE - the ClassWizard will add and remove member functions here. R% ,<\d7  
  // DO NOT EDIT what you see in these blocks of generated code ! ZwerDkd  
  //}}AFX_MSG BQ2wnGc  
  DECLARE_MESSAGE_MAP() BC;:  
}; ,b;{emX h  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); { e5/+W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tP%{P"g3^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GMZv RAu i  
BOOL InitHotkey(); j"@93D~  
BOOL UnInit(); gzD@cx?V  
#endif 0 Ir<y  
CZt \JW+"  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2'<[7!  
#include "stdafx.h" dVo.Czyd  
#include "hook.h" R &4Z*?S  
#include <windowsx.h> +@K09ge  
#ifdef _DEBUG A4?+T+#d  
#define new DEBUG_NEW lP!;3iJ B  
#undef THIS_FILE !\;FNu8_.  
static char THIS_FILE[] = __FILE__; ^3FE\V/=  
#endif ;/*6U  
#define MAX_KEY 100 P7f,OY<@%o  
#define CTRLBIT 0x04 f5==";eP  
#define ALTBIT 0x02  ?k|H3;\  
#define SHIFTBIT 0x01 FSb Hn{@  
#pragma data_seg("shareddata") NwR}yb6  
HHOOK hHook =NULL; Z@%HvB7  
UINT nHookCount =0; 9bq<GC'eX8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey b (I2m  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT PeE/iZ.  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 2kUxD8BcN  
static int KeyCount =0; iTg;7~1pY  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @b3#X@e}  
#pragma data_seg() }Lw>I94e  
HINSTANCE hins; okFvn;  
void VerifyWindow(); T'aec]u  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) @ (i!Y L  
//{{AFX_MSG_MAP(CHookApp) {?}*1,I  
// NOTE - the ClassWizard will add and remove mapping macros here. *8tI*Pus  
// DO NOT EDIT what you see in these blocks of generated code! cFF*Z=L _  
//}}AFX_MSG_MAP 79yd&5#e?  
END_MESSAGE_MAP() y{a$y}7#X  
.+([  
CHookApp::CHookApp() xN@Pz)yo  
{ R1W}dRE}  
 // TODO: add construction code here, c$QX )V  
 // Place all significant initialization in InitInstance M}wXJ8aF?  
} 5 VA(tzmCt  
q0bHB_|wL  
CHookApp theApp; !HJ$UG/\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )I-fU4?  
{ [J0 v&{)?  
 BOOL bProcessed=FALSE; N8`4veVBx'  
 if(HC_ACTION==nCode) q(5+xSg"gK  
 { P0-Fc@&Y  
  if((lParam&0xc0000000)==0xc0000000){// Key up CCGV~e+  
   switch(wParam) ACK1@eF  
   { }V|{lvt.  
    case VK_MENU: ez9k4IO  
     MaskBits&=~ALTBIT; rqlc2m,<-p  
     break; ^U8r0]9  
    case VK_CONTROL: Kw`VrcwjT  
     MaskBits&=~CTRLBIT; eb8w~   
     break; TV}}dw  
    case VK_SHIFT: h`}3h< 8  
     MaskBits&=~SHIFTBIT; <_./SC  
     break; 9ElCg"  
    default: //judge the key and send message uGl| pJ\y=  
     break; @E53JKYhY  
   } Q\3 Z|%  
   for(int index=0;index<MAX_KEY;index++){ M}hrO-C  
    if(hCallWnd[index]==NULL) {+g[l5CR[  
     continue; =)OC|?9 C\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9Of FM9(:  
    { X+n`qiwq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *}):<nB$^  
     bProcessed=TRUE; TjBY 4  
    } <[/%{sUNC  
   } [ &qA\  
  } +"g~"<  
  else if((lParam&0xc000ffff)==1){ //Key down sF+=KH  
   switch(wParam) 7a$ G@  
   { b( ^^m:(w  
    case VK_MENU: 2_t=P|Uo  
     MaskBits|=ALTBIT; 9(!]NNf!  
     break; -6Mm#sX  
    case VK_CONTROL: B )JM%r  
     MaskBits|=CTRLBIT; O;]?gj 1@  
     break; Sb:T*N0gS  
    case VK_SHIFT: cxYfZ4++m  
     MaskBits|=SHIFTBIT; ]> Y/r-!  
     break; @)8]e S7  
    default: //judge the key and send message 7CB#YP?E  
     break; u.|~$yP.!  
   } w h$jr{  
   for(int index=0;index<MAX_KEY;index++) i(6J>^I  
   { dy>|c j  
    if(hCallWnd[index]==NULL) n!He&  
     continue; sxED7,A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pD@zmCU  
    { i$-#dc2qY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &VWlt2-R0h  
     bProcessed=TRUE; Cv=GZGn-  
    } b]]N{: I  
   } ^Dx#7bsDZR  
  } ]wuy_+$  
  if(!bProcessed){ G7* h{nE  
   for(int index=0;index<MAX_KEY;index++){ cUDgM  
    if(hCallWnd[index]==NULL) !@ YXZ  
     continue; WO,xMfK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [ev-^[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cVq}c?  
   } ZZ)G5ji  
  }  9|S`ub'  
 } "L2m-e6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); u:` y]  
} g3?U#7i  
e"+dTq8W  
BOOL InitHotkey() hQgN9S5P  
{ S9Yt1qb  
 if(hHook!=NULL){ C/v}^#cLD  
  nHookCount++; |&hU=J o  
  return TRUE; %>XN%t'6aT  
 } | D.C!/69  
 else hWcTI{v  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); i.rU&yT%  
  if(hHook!=NULL) 77 :'I  
   nHookCount++; wh~s Z  
  return (hHook!=NULL); uf@U:V  
} O=jN&<rb  
BOOL UnInit() 5su.+4z\  
{ f(u&XuZ  
 if(nHookCount>1){ S@:B6](D$  
  nHookCount--; U 0ZB^`  
  return TRUE; :LV.G0)#  
 } <Ns &b.\h6  
 BOOL unhooked = UnhookWindowsHookEx(hHook); >v0:qN7|  
 if(unhooked==TRUE){ {&nV4c$v  
  nHookCount=0; BGjb`U#%3  
  hHook=NULL; ZxS&4>.  
 } 3DoRE2}  
 return unhooked; ~/`X*n&  
}  ?B4#f!X  
SQKt}kDbM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IG / $!* E  
{ M<qudi  
 BOOL bAdded=FALSE; [{PqV):p  
 for(int index=0;index<MAX_KEY;index++){ U7%28#@  
  if(hCallWnd[index]==0){ H(\V+@~>AD  
   hCallWnd[index]=hWnd; }#b %"I0  
   HotKey[index]=cKey; *e<_; Kr?  
   HotKeyMask[index]=cMask; _F8T\f |  
   bAdded=TRUE; LC'2q*:'  
   KeyCount++; ( D}" &2  
   break; |@`"F5@,  
  } *:arva5  
 } Sa}D.SBg  
 return bAdded; bc}dYK3$q  
} @ u1Q-:  
-fux2?8M  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dokuyiN\  
{ cjg=nTsBA  
 BOOL bRemoved=FALSE; dp^N_9$cdO  
 for(int index=0;index<MAX_KEY;index++){ v"k 4ATWP  
  if(hCallWnd[index]==hWnd){ AA7#c7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ aii'}c  
    hCallWnd[index]=NULL; 1!s28C5u  
    HotKey[index]=0; g[!Cj,  
    HotKeyMask[index]=0; gNa#|  
    bRemoved=TRUE; hh&Js'd  
    KeyCount--; yH(V&Tv  
    break; [~?M/QI9  
   } ?0npEz|  
  } )Z:m)k>r;  
 } ~.Q4c*_b  
 return bRemoved; y#r\b6  
} {U P_i2`.  
oYq E*mA  
void VerifyWindow() \G=bj;&eF  
{ qP`?M\!O  
 for(int i=0;i<MAX_KEY;i++){ Xa Gz].Sv  
  if(hCallWnd!=NULL){ ype"7p\  
   if(!IsWindow(hCallWnd)){ Y:%"K  
    hCallWnd=NULL; Q2$/e+   
    HotKey=0; <NL+9lR  
    HotKeyMask=0; *eoq=,O  
    KeyCount--; mCrU//G  
   } {Pvr??"r  
  } QX/]gX  
 } 3YRB I|XO  
} ;@'0T4Z&l  
dM gbW<uAu  
BOOL CHookApp::InitInstance() WH;xq^  
{ sbjtL,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); `]LODgk~  
 hins=AfxGetInstanceHandle(); h *waRD  
 InitHotkey(); a^*B5G1(&  
 return CWinApp::InitInstance(); `7>K1slQ}S  
} ;q&Z9 lm  
[EOMCH2Ki  
int CHookApp::ExitInstance() w}b<D#0XC  
{ GFY-IC+fc  
 VerifyWindow(); 'Ix5,^M}B  
 UnInit(); g$gVm:=  
 return CWinApp::ExitInstance(); V*kznm  
} d'q;+ jnP  
R]VTV7D  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |3|wdzV  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7rPLnB]  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ PoY>5  
#if _MSC_VER > 1000 @d P~X  
#pragma once 9 G((wiE  
#endif // _MSC_VER > 1000 KY 8^BjY@  
ec`>KuY  
class CCaptureDlg : public CDialog 8ipW3~-4  
{ >VypE8H]x  
 // Construction r"1A`89  
 public: c_[ JjG^?P  
  BOOL bTray; XNK 43fkB.  
  BOOL bRegistered; e)b r`CD%  
  BOOL RegisterHotkey(); 7~lB}$L  
  UCHAR cKey; NB3/A"}"02  
  UCHAR cMask; `lvh\[3^  
  void DeleteIcon(); s V&`0N  
  void AddIcon(); &8juS,b  
  UINT nCount; 78^Y;2 P]W  
  void SaveBmp(); l4DeX\ly7f  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor w8U2y/:>  
  // Dialog Data <xC: Ant  
  //{{AFX_DATA(CCaptureDlg) Fv;u1Atiw  
  enum { IDD = IDD_CAPTURE_DIALOG }; vFR 1UPF  
  CComboBox m_Key; #[C< J#;  
  BOOL m_bControl; =sL(^UISl  
  BOOL m_bAlt; Age-AJ  
  BOOL m_bShift; 4'_L W?DS  
  CString m_Path; \v.HG] /u  
  CString m_Number; _82<| NN:  
  //}}AFX_DATA D@2Ya/c  
  // ClassWizard generated virtual function overrides ^CO#QnB @  
  //{{AFX_VIRTUAL(CCaptureDlg) kaV%0Of]  
 public: }t}38%1i  
  virtual BOOL PreTranslateMessage(MSG* pMsg); M2a}x+5'  
 protected: -Zttj/K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G|<]Ma9x  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |F3vRt@  
  //}}AFX_VIRTUAL EmYO5Whi  
  // Implementation _dz +2au  
 protected: [p2g_bI8yK  
  HICON m_hIcon; Q1K"%  
  // Generated message map functions S_`W@cp[  
  //{{AFX_MSG(CCaptureDlg) 'o7R/`4KR  
  virtual BOOL OnInitDialog(); `9]P/J^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 'et(:}i  
  afx_msg void OnPaint(); q`h7H][(A  
  afx_msg HCURSOR OnQueryDragIcon(); ry z /rf  
  virtual void OnCancel(); x0y% \  
  afx_msg void OnAbout(); cvn-*Sj  
  afx_msg void OnBrowse(); =H L9Z  
  afx_msg void OnChange(); iM4mkCdOO  
 //}}AFX_MSG @F>[DW]O  
 DECLARE_MESSAGE_MAP() nm<L&11  
}; p, !1 3X  
#endif (Be$$W  
R %Rv  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file N=hSqw[  
#include "stdafx.h" 9Kq<\"7Bmz  
#include "Capture.h" N+ak[axN  
#include "CaptureDlg.h" wEZqkV  
#include <windowsx.h> Y}85J:q]  
#pragma comment(lib,"hook.lib") ;:-}z.7Y  
#ifdef _DEBUG ?S+/QyjcfJ  
#define new DEBUG_NEW p{+tFQy  
#undef THIS_FILE 7)g;Wd+H  
static char THIS_FILE[] = __FILE__; ^[k6]1h  
#endif `#-p,NElV  
#define IDM_SHELL WM_USER+1 -Pv P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,^UcRZ8.H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bEBZ!ghU  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; h[vAU 9f)  
class CAboutDlg : public CDialog ke{DFq h  
{ $Vd?K@W[h  
 public: qb#V)  
  CAboutDlg(); *g}vT8w'}  
  // Dialog Data d@_'P`%-  
  //{{AFX_DATA(CAboutDlg) h#$ _<U  
  enum { IDD = IDD_ABOUTBOX }; nhB^Xr=  
  //}}AFX_DATA 37.) @  
  // ClassWizard generated virtual function overrides y}3 `~a  
  //{{AFX_VIRTUAL(CAboutDlg) yYVW"m  
 protected: ^!zJf7(+<>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /DgT1^&0  
  //}}AFX_VIRTUAL <FMuWHY  
  // Implementation ,C5@ P+A  
 protected: eh8<?(eK  
  //{{AFX_MSG(CAboutDlg) 0Og/47dO.2  
  //}}AFX_MSG o{s4.LKK  
  DECLARE_MESSAGE_MAP() PQr#G JG7  
}; Y- z~#;  
LR 8e|H0  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) W$x K^}  
{ s>[vT?  
 //{{AFX_DATA_INIT(CAboutDlg) >KH(nc$  
 //}}AFX_DATA_INIT !XG/,)A  
} { &6l\|  
[346w <  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6%Cna0x:&  
{ $~;6hnr m  
 CDialog::DoDataExchange(pDX); _R>s5|_  
 //{{AFX_DATA_MAP(CAboutDlg) Y9lbf_51  
 //}}AFX_DATA_MAP *,Aa9wa{  
} fSgGQ D4  
)o}=z\M-bN  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) uC <|T  
 //{{AFX_MSG_MAP(CAboutDlg) &q"uy:Rd  
 // No message handlers 7KYF16A4  
 //}}AFX_MSG_MAP EX[l0]fj  
END_MESSAGE_MAP() v= 8~ZDY  
z. Ve#~\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) q[We][Nrzb  
: CDialog(CCaptureDlg::IDD, pParent) VH$\ a~|  
{ `UzCq06rJ1  
 //{{AFX_DATA_INIT(CCaptureDlg) M[&.kH  
  m_bControl = FALSE; HzFt  
  m_bAlt = FALSE; m-&a~l  
  m_bShift = FALSE; $)WH^Ir~  
  m_Path = _T("c:\\"); 'PxL^  
  m_Number = _T("0 picture captured."); }K qw\]`  
  nCount=0; A=@V LU4%  
  bRegistered=FALSE; 'RN"yMv7l  
  bTray=FALSE; Ezo" f  
 //}}AFX_DATA_INIT 3 8ls 4v3  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 )aO!cQ{s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \dQ2[Ek  
} "1pZzad  
b W`)CWd  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `s|\" @2  
{ _YD<Q@  
 CDialog::DoDataExchange(pDX); +eH=;8  
 //{{AFX_DATA_MAP(CCaptureDlg) (\AszLW  
  DDX_Control(pDX, IDC_KEY, m_Key); iIC9rso"Q1  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); U iPVZ@?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); f/|a?n2\hm  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); !*$'fn'bAA  
  DDX_Text(pDX, IDC_PATH, m_Path); |x}&wFV  
  DDX_Text(pDX, IDC_NUMBER, m_Number); )gm\e?^   
 //}}AFX_DATA_MAP \t 7zMp  
} +q>C}9s3  
&  t @  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) x Ps& CyI  
//{{AFX_MSG_MAP(CCaptureDlg) ! a8h  
 ON_WM_SYSCOMMAND() Av[|.~g  
 ON_WM_PAINT() LO Yyj?^7  
 ON_WM_QUERYDRAGICON() !'UsC6Y4  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Iclan\q#y  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'TEwU0<%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .Jnp{Tet  
//}}AFX_MSG_MAP 3k|~tVM  
END_MESSAGE_MAP() PhaQ3%  
LVz%$Cq,0  
BOOL CCaptureDlg::OnInitDialog() }9fV[zO  
{  4pOc`  
 CDialog::OnInitDialog(); M KE[Yb?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <=LsloI  
 ASSERT(IDM_ABOUTBOX < 0xF000); 8~XI7g'5x  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ,YuWz$aF{  
 if (pSysMenu != NULL) 9/^Bj  
 { RdpQJ)3F  
  CString strAboutMenu; K <fq=:I3  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ^9m^#"ZW`  
  if (!strAboutMenu.IsEmpty()) [pyXX>:M  
  { j4hUPL7  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,_7tRkn  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); r+WPQ`Ar  
  } #)c;i<Q3S  
 } trNK9@wT)  
 SetIcon(m_hIcon, TRUE); // Set big icon -_H2FlB  
 SetIcon(m_hIcon, FALSE); // Set small icon ?R~Ye  
 m_Key.SetCurSel(0); yW7S }I  
 RegisterHotkey(); {:q9:  
 CMenu* pMenu=GetSystemMenu(FALSE); #'{PY r  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); laIC}!  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); PT5ni6  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); fn"jYSy  
 return TRUE; // return TRUE unless you set the focus to a control ~O3uje_  
} "NI>HO.U  
"}Sid+)<  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) z4OR UQ  
{ #._6lESK  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ]k%KTvX*G  
 { d~oWu [F*  
  CAboutDlg dlgAbout; Ns] 9-D  
  dlgAbout.DoModal(); 3t}o0Ai9  
 } >w2WyYJYH  
 else p9bxhnn|  
 { B7^n30+L  
  CDialog::OnSysCommand(nID, lParam); rzY@H }u  
 } jMN@x]6w  
} ^bgm0,M  
ROiX =i  
void CCaptureDlg::OnPaint() 0}3'h#33=  
{ "VOW V3Z  
 if (IsIconic()) '%/u103{e  
 { */m~m?  
  CPaintDC dc(this); // device context for painting 2nz'/G  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Q,+*u%/u  
  // Center icon in client rectangle Gt *<?  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,'0oj$~S:  
  int cyIcon = GetSystemMetrics(SM_CYICON); N`^W*>XB  
  CRect rect; KPvYq?F>4  
  GetClientRect(&rect); V$]a&wM<5  
  int x = (rect.Width() - cxIcon + 1) / 2; V?pO~q o  
  int y = (rect.Height() - cyIcon + 1) / 2; HK4`@jYQ  
  // Draw the icon XhkL)) FcG  
  dc.DrawIcon(x, y, m_hIcon); (E]K)d  
 } :a<TV9?H0  
 else %>}7 $Y%  
 { Z["nY&.sI  
  CDialog::OnPaint(); ~5?n&pF  
 } i!-sbwd7  
} ,Onm!LI=  
lfG&V +S1  
HCURSOR CCaptureDlg::OnQueryDragIcon() wtick~)  
{ [~%;E[ky$  
 return (HCURSOR) m_hIcon; V$%Fs{  
} ?;QKe0I^  
=1B&d[3;  
void CCaptureDlg::OnCancel() E MbI\=>yS  
{ ~2qG" 1[\  
 if(bTray) A>,fG9pR  
  DeleteIcon(); aD`e]K ^L  
  CDialog::OnCancel(); zU=[Kc=$  
} +4vX+;: br  
&(1NOyX&  
void CCaptureDlg::OnAbout() tQ<2K*3]  
{ ATkqzE`;  
 CAboutDlg dlg; KTREOOu .t  
 dlg.DoModal(); N.cRZm%  
} WK5bt2x  
G+yz8@  
void CCaptureDlg::OnBrowse() 9W r(w  
{ n;Wf|>  
 CString str; {oC69n:  
 BROWSEINFO bi; `SbX`a0p2  
 char name[MAX_PATH]; T$B4DQ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `I<|*vW u  
 bi.hwndOwner=GetSafeHwnd(); h^X.e[  
 bi.pszDisplayName=name; l3$?eGGM  
 bi.lpszTitle="Select folder"; p ;01a  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; t`D@bzLC%  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 7im;b15j`'  
 if(idl==NULL) "qp_*Y  
  return; tHo/uW_~I  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); c8W=Is`  
 str.ReleaseBuffer(); ;]ew>P)  
 m_Path=str; FCAu%lvZT  
 if(str.GetAt(str.GetLength()-1)!='\\') AV`7> @  
  m_Path+="\\"; _ !vbX mb  
 UpdateData(FALSE); No+zw%l0E  
} $h f\ #'J  
Nd)o1 {I  
void CCaptureDlg::SaveBmp() ?*dx=UI  
{ ps J 1J  
 CDC dc; =ZL2 0<TeH  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); XV!EjD~q  
 CBitmap bm; j<5R$^?U  
 int Width=GetSystemMetrics(SM_CXSCREEN); $dUN+9  
 int Height=GetSystemMetrics(SM_CYSCREEN);  8eLL  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Y'R1\Go-  
 CDC tdc; ]<_+uciP5[  
 tdc.CreateCompatibleDC(&dc); 0\ ;a:E.c  
 CBitmap*pOld=tdc.SelectObject(&bm); &"0[7zgYQz  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )Jn80~U|1  
 tdc.SelectObject(pOld); ,5WDYk-  
 BITMAP btm; <:o><f+  
 bm.GetBitmap(&btm); wAPdu y[  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; );LwWKa  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); v#G ^W  
 BITMAPINFOHEADER bih; $cCB%}  
 bih.biBitCount=btm.bmBitsPixel; q>Y[.c-  
 bih.biClrImportant=0; 'IszS!kY  
 bih.biClrUsed=0; mY9K)]8  
 bih.biCompression=0; HN)QS5  
 bih.biHeight=btm.bmHeight; &*-2k-16  
 bih.biPlanes=1; =V4!t|(7  
 bih.biSize=sizeof(BITMAPINFOHEADER); ybkN^OEJ  
 bih.biSizeImage=size; mK4A/bsE  
 bih.biWidth=btm.bmWidth; - d6>  
 bih.biXPelsPerMeter=0; OkXOV   
 bih.biYPelsPerMeter=0; \aozecpC`  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); bp_@e0  
 static int filecount=0; C I0^eaFs  
 CString name; WDR!e2G  
 name.Format("pict%04d.bmp",filecount++); "f+2_8%s+  
 name=m_Path+name; \x}UjHYIc&  
 BITMAPFILEHEADER bfh; GC2<K  
 bfh.bfReserved1=bfh.bfReserved2=0; :gC2zv  
 bfh.bfType=((WORD)('M'<< 8)|'B'); st>t~a|T  
 bfh.bfSize=54+size; =uTV\)  
 bfh.bfOffBits=54; >Fh@:M7z  
 CFile bf; '@P[fSQ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Ckp=d  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @YELqUb*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p IToy;]  
  bf.WriteHuge(lpData,size); `Ea3z~<7M  
  bf.Close(); nm.d.A/]Z  
  nCount++; %{"STbO#>  
 } hW&UG#PY>  
 GlobalFreePtr(lpData); hd' n"  
 if(nCount==1) N0f}q1S<-A  
  m_Number.Format("%d picture captured.",nCount); DEhA8.v  
 else CXA8V"@&b/  
  m_Number.Format("%d pictures captured.",nCount); hpu(MX\  
  UpdateData(FALSE); c#Bde-dh  
} m`cG&Ar5  
1<UQJw45  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) o6oYJ`PY  
{ NGu]|p  
 if(pMsg -> message == WM_KEYDOWN) e ^QOn  
 { 25r=Xv  
  if(pMsg -> wParam == VK_ESCAPE) TPuzL(ws  
   return TRUE; C'#:}]@E  
  if(pMsg -> wParam == VK_RETURN) kLP^q+$u)!  
   return TRUE; sBMHf9u  
 } ej `$-hBBV  
 return CDialog::PreTranslateMessage(pMsg); ^8)d8?}  
} *k -UQLJ  
Z"u/8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $9/r*@bu8d  
{ $}@l l^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Yc}b&  
  SaveBmp(); \T?O.  
  return FALSE; ;Xns9  
} tti.-  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $6N. ykJ  
 CMenu pop; +]X^bB[  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); yI)2:Ca*  
 CMenu*pMenu=pop.GetSubMenu(0); v*pVcBY>  
 pMenu->SetDefaultItem(ID_EXITICON); 9viC3bj.o  
 CPoint pt; "rtmDNpL  
 GetCursorPos(&pt); 5h&8!!$[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;A_QI>>  
 if(id==ID_EXITICON) z; +x`i.  
  DeleteIcon(); smggr{-  
 else if(id==ID_EXIT) tP9}:gu  
  OnCancel(); ?a% u=G  
 return FALSE; ?(z3/ "g]  
} _kS us  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }PVB+i M  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) P<1zXs.H  
 AddIcon(); %Vq@WF  
 return res; _ i8}ld-  
} 9Z=Bs)-y.  
[(hENX}o :  
void CCaptureDlg::AddIcon() (Jm_2CN7X  
{ Yi:+,-Fso  
 NOTIFYICONDATA data; _z;N|Xe  
 data.cbSize=sizeof(NOTIFYICONDATA); @4pN4v8U  
 CString tip; chy7hPxC;  
 tip.LoadString(IDS_ICONTIP); )u$A!+fo  
 data.hIcon=GetIcon(0); N.]8qzW  
 data.hWnd=GetSafeHwnd(); =B\ ?(  
 strcpy(data.szTip,tip); P7 n~Ui~U  
 data.uCallbackMessage=IDM_SHELL; ]Q+Tm2{  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <_5z^@N3$  
 data.uID=98; ?AEpg.9R-  
 Shell_NotifyIcon(NIM_ADD,&data); R[b?kT-%  
 ShowWindow(SW_HIDE); AbB%osz}Ed  
 bTray=TRUE; >.A{=?   
} 2&M 8Wb#  
UX6-{ RP  
void CCaptureDlg::DeleteIcon() 28-@Ga4  
{ *k/_p ^  
 NOTIFYICONDATA data; jm!G@k6TA  
 data.cbSize=sizeof(NOTIFYICONDATA); iMS S8J  
 data.hWnd=GetSafeHwnd(); #8A|-u=3  
 data.uID=98; 6gv.n  
 Shell_NotifyIcon(NIM_DELETE,&data); (Q@+W |~  
 ShowWindow(SW_SHOW); U;_ ;_  
 SetForegroundWindow(); g)zy^ aDf  
 ShowWindow(SW_SHOWNORMAL); I$YF55uB  
 bTray=FALSE; n%Fa;!S  
} \(Iy>L.  
Ut<_D8Tzx  
void CCaptureDlg::OnChange() 3KGDS9I  
{ _\[Zr.y  
 RegisterHotkey(); 3Cpix,Dc  
} .gB#g{5+J  
bAgKOfT  
BOOL CCaptureDlg::RegisterHotkey() q o'1Pknz  
{ GYBM]mW^ W  
 UpdateData(); {YkW5zC(L  
 UCHAR mask=0; wi!Ml4Sb  
 UCHAR key=0; pl%ag~i5  
 if(m_bControl) >o@WT kF]  
  mask|=4; h' 16"j>  
 if(m_bAlt) >y1/*)O9~  
  mask|=2; wFh{\  
 if(m_bShift) RxqXGM`4  
  mask|=1; %9IM|\ulp  
  key=Key_Table[m_Key.GetCurSel()]; :U~[%]  
 if(bRegistered){ {pVD`#Tl[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); *w!H -*`  
  bRegistered=FALSE; yd2ouCUV  
 } 8g<3J-7Mm  
 cMask=mask; ^ H'|iju  
 cKey=key; $Uzc  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @r#>-p  
 return bRegistered; 2D "mq~ V  
} ^uYxeQY[  
~q<U E\H  
  四、小结 L%!jj7,9-  
#CM2FN:W  
  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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