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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: o;*Q}Gr<M  
  u@444Vzg  
  一、实现方法 QWU-m{@~&  
O&&~NXI\  
  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: AFn7uW!9Gw  
HKeK<V  
#pragma data_seg("shareddata") ig"L\ C"T  
HHOOK hHook =NULL; //钩子句柄 ^?|"L>y  
UINT nHookCount =0; //挂接的程序数目 l"]V6!-U  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 1Ws9WU  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 H*6W q  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey R-14=|7a-  
static int KeyCount =0; _dU\JD  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Xc.`-J~Il  
#pragma data_seg() afk>+4q  
s[N@0  
  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。 _Ey5n!0:  
}2oc#0  
  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: X{VOAcugr  
M\=2uKG#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,u m|1dh  
cKey,UCHAR cMask) DNi+"[~&P  
{ kT=8e;K  
 BOOL bAdded=FALSE; lxi<F  
 for(int index=0;index<MAX_KEY;index++){ R#KU^]"(  
  if(hCallWnd[index]==0){ 8k79&|  
   hCallWnd[index]=hWnd; :KO2| v\  
   HotKey[index]=cKey; Va8&Z  
   HotKeyMask[index]=cMask; b Zt3|  
   bAdded=TRUE; n@w%Zl  
   KeyCount++; 9 $X-  
   break; -qoH,4w  
  } 8Y?;x}  
 } X?Au/  
 return bAdded; 'q.!|G2U  
} B<-Wea  
//删除热键 nFn5v'g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `X8F`5&U\f  
{ V.Mry`9-  
 BOOL bRemoved=FALSE; T C"<g  
 for(int index=0;index<MAX_KEY;index++){ QW"! (`K  
  if(hCallWnd[index]==hWnd){ MQ4KdqgP  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $!DpjN  
    hCallWnd[index]=NULL; _B0L.eF  
    HotKey[index]=0; ?Ob3tUz2  
    HotKeyMask[index]=0; g&.=2uP  
    bRemoved=TRUE; I@3MO0V^  
    KeyCount--; PW4q~rc=:  
    break; NVs@S-rpX  
   } |hQ;l|SWg  
  }  _4f;<FL  
 } W9)&!&<o  
 return bRemoved; 9FX-1,Jx  
} H.0K?N&\?>  
4\i[m:e=@  
f 1d?.)  
  DLL中的钩子函数如下: /O9EQPm(  
KmF]\:sMD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) > P)w?:k  
{ Ep}s}Stlr}  
 BOOL bProcessed=FALSE; cNH7C"@GVu  
 if(HC_ACTION==nCode) _G0 x3  
 { ##{taR8  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 DI%saw  
   switch(wParam) %3 rP `A  
   {  -HuA \0J  
    case VK_MENU: ctUp=po  
     MaskBits&=~ALTBIT; wS*E(IAl  
     break; Y ay?=Y{  
    case VK_CONTROL: Mfs?x a  
     MaskBits&=~CTRLBIT; N;gfbh]  
     break; 9B4&m|g  
    case VK_SHIFT: K%d&EYoW]  
     MaskBits&=~SHIFTBIT; 0aAoV0fMDz  
     break; 2?x4vI np;  
    default: //judge the key and send message BuwY3F\-O  
     break; Xeaj xcop#  
   } 4R*,VR.K  
   for(int index=0;index<MAX_KEY;index++){ #b`k e/P  
    if(hCallWnd[index]==NULL) u&NV,6Fj2[  
     continue; *] (iS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7Ix973^  
    { ~m |BC*)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nrb Ok4Dz  
     bProcessed=TRUE; 626r^c=  
    } {8OCXus3m  
   } |^aKs#va  
  } ]{iQ21`a-  
  else if((lParam&0xc000ffff)==1){ //有键按下 #*}+J3/  
   switch(wParam) "}!G!k:  
   { #`IN`m|  
    case VK_MENU: MJvp6n  
     MaskBits|=ALTBIT; Vc2`b3"Br  
     break; m2o0y++TjW  
    case VK_CONTROL: ]tD]Wx%  
     MaskBits|=CTRLBIT; SdWV3  
     break; &o*A {  
    case VK_SHIFT: l\mPHA23  
     MaskBits|=SHIFTBIT; OY d !v`<  
     break;  `]X>V,  
    default: //judge the key and send message +0~YP*I`/  
     break; d5.4l&\u  
   } pFXEu= $3  
   for(int index=0;index<MAX_KEY;index++){ w@b)g  
    if(hCallWnd[index]==NULL) (?c-iKGc  
     continue; OH88n69  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z7#+pPt!  
    { N0lC0 N?_J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); eJSxn1GW  
     bProcessed=TRUE; ,^:.dFH6  
    } <N)oS-m>  
   } G#CXs:1pd+  
  } Ngwb Q7)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 s>en  
   for(int index=0;index<MAX_KEY;index++){ H.c7Nle  
    if(hCallWnd[index]==NULL) 25T18&R  
     continue; K;(mC<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^"g~-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); OPi0~s  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,>M[@4`,U  
   } U17d>]ka  
  } ~zgGa:uU  
 } 7"##]m.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?CZd Ol  
} H[gWGbPq7  
U(Zq= M  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 6mE\OS-I  
iwq!w6+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nNm`Hfi  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :Al!1BJQ  
N;d] 14|  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: (mOtU8e  
2/f}S?@   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =-T]3!   
{ 92c HwWZ!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Zc yc*{DS  
 { H.;Q+A,8^  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 q| 7(  
  SaveBmp(); K'xV;r7Nt  
  return FALSE; BWNi [^]  
 } fOHxtHM  
 …… //其它处理及默认处理  bLL2  
} UBs4K*h|  
Lr+$_ t}r  
)_:NLo:  
  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。 6LZCgdS{  
/xQTxh1;K  
  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。 &[9709 (=  
0"R|..l/  
  二、编程步骤 x38 QD;MT  
Pfhmo $  
  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"; zqku e%^?-  
Smh,zCc>s  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5(2;|I,T  
SJLis"8  
  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; l}h!B_P'  
"tZe>>I  
  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; :3PH8TL  
h( 4v8ae  
  5、 添加代码,编译运行程序。 [UR-I0 s!/  
<v2;p}A  
三、程序代码 xk5 ]^yDp  
+3gp%`c4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL T|$H#n}  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) iscz}E,Y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ TC('H[ ]  
#if _MSC_VER > 1000 mq l Z?-  
#pragma once sKWfX Cd  
#endif // _MSC_VER > 1000 x;S @bY  
#ifndef __AFXWIN_H__ wzA$'+Mb  
#error include 'stdafx.h' before including this file for PCH ,uvRi)O>a  
#endif wkq 66?  
#include "resource.h" // main symbols m 5.Zu.  
class CHookApp : public CWinApp GyIV Hby  
{ (Z*!#}z`  
 public: K9[UB  
  CHookApp(); mw!F{pw  
  // Overrides `uFdwO'DD  
  // ClassWizard generated virtual function overrides 0sqFF[i  
  //{{AFX_VIRTUAL(CHookApp) >z03{=sAN  
 public: ^~dWU>  
  virtual BOOL InitInstance(); ]d]]'Hk  
  virtual int ExitInstance(); dM5-;  
  //}}AFX_VIRTUAL ,}PgOJZ  
  //{{AFX_MSG(CHookApp) e(sk[guvX  
  // NOTE - the ClassWizard will add and remove member functions here. bOB \--:]  
  // DO NOT EDIT what you see in these blocks of generated code ! }EPY^VIw  
  //}}AFX_MSG [GR; ?R5  
  DECLARE_MESSAGE_MAP() a[C@  
}; KXy6Eno  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); *hx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +0&/g&a\R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #R"*c hLV  
BOOL InitHotkey(); 2iOV/=+  
BOOL UnInit(); 8m MQ[#0:}  
#endif y `UaB3q  
F847pyOJnf  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^#$n~]s  
#include "stdafx.h" Wri<h:1  
#include "hook.h" b sX[UF  
#include <windowsx.h> 53D]3  
#ifdef _DEBUG .]u /O`c]  
#define new DEBUG_NEW ZH8,K Y"  
#undef THIS_FILE ?}0,o.  
static char THIS_FILE[] = __FILE__; |N2#ItBbW  
#endif >j/w@Fj  
#define MAX_KEY 100 f?Lw)hMrA  
#define CTRLBIT 0x04 ;'|Ey  
#define ALTBIT 0x02 l;Wj]  
#define SHIFTBIT 0x01 `Oa WGZ[  
#pragma data_seg("shareddata") ~a:  
HHOOK hHook =NULL; Oz95  
UINT nHookCount =0; Pal=F0-Q\  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey &pRREu:[4L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT %Zi} MPx  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey $I=~S[p  
static int KeyCount =0; N['  .BN  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift tA;}h7/Lc~  
#pragma data_seg() +whDU2 "  
HINSTANCE hins; fu5=k:/c  
void VerifyWindow(); t# i #(H  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) QV!up^Zso  
//{{AFX_MSG_MAP(CHookApp) ,F|f. 7;  
// NOTE - the ClassWizard will add and remove mapping macros here. p2eGm-Erq  
// DO NOT EDIT what you see in these blocks of generated code! }tz7b#  
//}}AFX_MSG_MAP [WmM6UEVS  
END_MESSAGE_MAP() ueudRb  
G[=c Ss,  
CHookApp::CHookApp() pP_LR ks}  
{ O-^Ma- }  
 // TODO: add construction code here, _XBd3JN@  
 // Place all significant initialization in InitInstance C]6O!Pb0  
} )e{aN+  
Hka2  
CHookApp theApp; L,\Iasv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \hXDO_U  
{ KoT\pY^7\  
 BOOL bProcessed=FALSE; g#bRT*,L  
 if(HC_ACTION==nCode) ^W ^OfY  
 { @dK Tx#gZ  
  if((lParam&0xc0000000)==0xc0000000){// Key up s<Ziegmw|g  
   switch(wParam) +>,I1{u%&  
   { m`XHKRp  
    case VK_MENU: 3BI1fXT4=j  
     MaskBits&=~ALTBIT; s!J9|]o  
     break; Tk}]Gev  
    case VK_CONTROL: A^g(k5M*  
     MaskBits&=~CTRLBIT; dN q$}  
     break; h{Y",7] !  
    case VK_SHIFT: By |4 m  
     MaskBits&=~SHIFTBIT; /: "1Z]@  
     break; 6Mf0`K  
    default: //judge the key and send message )7F/O3Tq  
     break; 4RO}<$Nx}  
   } m0wDX*Qn  
   for(int index=0;index<MAX_KEY;index++){ th_oJcS  
    if(hCallWnd[index]==NULL) sC'` ~}C  
     continue; G{}VPcrbC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @JMiO^  
    { fhiM U8(&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ui~>SN>s  
     bProcessed=TRUE; ?s01@f#  
    } C dn J&N{  
   } [y(MCf19  
  } @gblW*Zhk  
  else if((lParam&0xc000ffff)==1){ //Key down L!92P{K  
   switch(wParam) %b$>qW\*&  
   { _6Sp QW  
    case VK_MENU: B\~}3!j  
     MaskBits|=ALTBIT; oJ^P(]dw  
     break; X ?O[r3<  
    case VK_CONTROL: K;?+8(H  
     MaskBits|=CTRLBIT; V[LglPt  
     break; VA%J\T|G2\  
    case VK_SHIFT: I7onX,U+  
     MaskBits|=SHIFTBIT;  B,@i  
     break; (PL UFT  
    default: //judge the key and send message m O_af  
     break; cuX)8+  
   } !$ JT e  
   for(int index=0;index<MAX_KEY;index++) C%u28|  
   { KlEpzJ98  
    if(hCallWnd[index]==NULL) 2y4bwi  
     continue; *dQSw)R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ES[G  
    { f*Hr^b}`8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); z{ dEC %  
     bProcessed=TRUE; )~>YH*g  
    } dtDFoETz  
   } _a, s )  
  } I9^x,F"E]  
  if(!bProcessed){ &oNAv-m^GD  
   for(int index=0;index<MAX_KEY;index++){ Rq-ZL{LR7  
    if(hCallWnd[index]==NULL) -"x$ZnHU  
     continue; ]Wup/o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W/N7vAx X  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5xiEPh  
   } ).O)p9  
  } KNl$3nX  
 } 0GLM(JmK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~%oR[B7=|  
} Eci\a]  
P55fL-vo|}  
BOOL InitHotkey() }>\C{ClI  
{ kh<2BOV  
 if(hHook!=NULL){ 3]hWfj1m2  
  nHookCount++; :FF=a3/"6  
  return TRUE; ?6!LL5a.  
 } P}iE+Z 3  
 else 8ag!K*\ V<  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [E_9V%^  
  if(hHook!=NULL) lE;!TQj:X  
   nHookCount++; bA 2pbjg=  
  return (hHook!=NULL); @Qe0! (_=  
} Z+SRXKQ  
BOOL UnInit() /r 5eWR1G  
{ +T ?NH9  
 if(nHookCount>1){ XW/o<[91  
  nHookCount--; YSMAd-Ef-  
  return TRUE; +ZYn? #IQ  
 } lZ0 =;I  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 9WHddDA  
 if(unhooked==TRUE){ [ ~,AfY  
  nHookCount=0; y`Fw-!'o  
  hHook=NULL; WIOV2+  
 } 2%1hdA<  
 return unhooked; pAEx#ck  
} ~[: 2I  
t^HRgY'NjM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L];b< *d  
{ rQXzR  
 BOOL bAdded=FALSE; |ZBw<f  
 for(int index=0;index<MAX_KEY;index++){ YIE<pX4Q7)  
  if(hCallWnd[index]==0){ :gT4K-O j  
   hCallWnd[index]=hWnd; DIvHvFss  
   HotKey[index]=cKey; llDJ@  
   HotKeyMask[index]=cMask; :N@^?q{b  
   bAdded=TRUE; qR.Q,(b|  
   KeyCount++; N!32 wJ  
   break; ^8tEach  
  } (hsl~Jf  
 } )"LJ hLg  
 return bAdded; m|# y >4  
} NI5``BwpO  
fM}#ON>Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +p^u^a  
{ v=k$A  
 BOOL bRemoved=FALSE; $M#>9QHhc  
 for(int index=0;index<MAX_KEY;index++){ l, wp4 Ll  
  if(hCallWnd[index]==hWnd){ 5f/`Q   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5xde;  
    hCallWnd[index]=NULL; l0] EX>"E  
    HotKey[index]=0; 4 :=]<sc,  
    HotKeyMask[index]=0; DlT{`  
    bRemoved=TRUE; Mtv?:q  
    KeyCount--; BY*Q_Et  
    break; !W0v >p  
   } 51u0]Qx;fm  
  } Bt#N4m[X*|  
 } ^{{q V  
 return bRemoved; \9d$@V  
} Qd6FH2Pl  
+V+a4lU14  
void VerifyWindow() z2c6T.1M  
{ Je@v8{][|  
 for(int i=0;i<MAX_KEY;i++){ ] - .aL  
  if(hCallWnd!=NULL){ ddo#P%sH'  
   if(!IsWindow(hCallWnd)){ -N@|QK>  
    hCallWnd=NULL; -/k 3a*$/  
    HotKey=0; 5r_|yu  
    HotKeyMask=0; D0C y^_  
    KeyCount--;  IB<d  
   } t Pf40`@  
  } fh{`Mz,o  
 } q;U,s)Uz^  
} 9kojLqCT  
7KPwQ?SjT  
BOOL CHookApp::InitInstance() 3F0 N^)@  
{ V1?]|HTQcT  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ccnK#fn v  
 hins=AfxGetInstanceHandle(); [Yyk0Qv|4  
 InitHotkey(); l@\FWWQ  
 return CWinApp::InitInstance(); Tr|JYLwF  
} *kVV+H<X|b  
b\ PgVBf9  
int CHookApp::ExitInstance() @KA4N`  
{ V:27)]q  
 VerifyWindow(); S$k&vc(0  
 UnInit(); +{>=^9%X  
 return CWinApp::ExitInstance(); $|@ r!/W  
} PX99uWx5]  
qNr} \J|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {U1m.30n  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) BD-AI  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q^I\cAIB  
#if _MSC_VER > 1000 nd(S3rct&  
#pragma once .KC ++\{HE  
#endif // _MSC_VER > 1000 x:7IIvP  
{^'HL   
class CCaptureDlg : public CDialog 4~=l}H>&  
{ 0ksa  
 // Construction ?}7p"3j'z  
 public: <| &Npd'  
  BOOL bTray; Jl<2>@  
  BOOL bRegistered; lLD12d  
  BOOL RegisterHotkey(); Z= !*e~j@  
  UCHAR cKey; WKU=.sY  
  UCHAR cMask; smLQS+UE  
  void DeleteIcon(); b[7 ]F  
  void AddIcon(); 1U\z5$V  
  UINT nCount; }`"6aM   
  void SaveBmp(); \?N2=jsu$  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ZC}QId  
  // Dialog Data >3_Gw4S*H  
  //{{AFX_DATA(CCaptureDlg) .~}1+\~5  
  enum { IDD = IDD_CAPTURE_DIALOG }; j.kG};f  
  CComboBox m_Key; 9/;P->wy  
  BOOL m_bControl; go"Hf_  
  BOOL m_bAlt; 2"5v[,$1H  
  BOOL m_bShift; :Yks|VJ1  
  CString m_Path; s@DLt+ O5  
  CString m_Number; iX\X>W$P  
  //}}AFX_DATA d| {r5[&  
  // ClassWizard generated virtual function overrides %IRi1EmN8  
  //{{AFX_VIRTUAL(CCaptureDlg) o]:9')5^  
 public: 4&f3%eTi  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Rh |nP&6  
 protected: |I|fMF2K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support km40qO@3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Q&V;(L62!  
  //}}AFX_VIRTUAL =ruao'A  
  // Implementation 9C \Fq-  
 protected: iIogx8[  
  HICON m_hIcon; _y3Xb`0a  
  // Generated message map functions )WoxMmz  
  //{{AFX_MSG(CCaptureDlg) .6V}3q$-@  
  virtual BOOL OnInitDialog(); _l]fkk[T  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); f9\X>zzB2|  
  afx_msg void OnPaint(); Yrn)VV[)h  
  afx_msg HCURSOR OnQueryDragIcon(); \15nS B  
  virtual void OnCancel(); {V-v-f  
  afx_msg void OnAbout(); `p7=t)5k  
  afx_msg void OnBrowse(); r4f~z$QK  
  afx_msg void OnChange(); TU7' J  
 //}}AFX_MSG rt| 7h>RQ  
 DECLARE_MESSAGE_MAP() ^KELKv,_  
}; &w~d_</  
#endif z~Q>V]a>;  
4{l,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3t6 LT  
#include "stdafx.h" 9I/N4sou  
#include "Capture.h" w\brVnt  
#include "CaptureDlg.h" t_suF$  
#include <windowsx.h> p^u:&Quac  
#pragma comment(lib,"hook.lib") 4g7)iL^#~  
#ifdef _DEBUG Y#3c }qb  
#define new DEBUG_NEW VYhbx 'e  
#undef THIS_FILE !3v1bGk  
static char THIS_FILE[] = __FILE__; e,5C8Q`Z  
#endif ~WN:DXn  
#define IDM_SHELL WM_USER+1 (3&?wy_l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h65-s  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); y|q3Wa  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; KK%M~Y+tU'  
class CAboutDlg : public CDialog  JSg$wi8  
{ u?{H}V  
 public: _]*>*XfF(  
  CAboutDlg(); vA.MRu#  
  // Dialog Data Zr,VR-kW+  
  //{{AFX_DATA(CAboutDlg) +&"zU GTIc  
  enum { IDD = IDD_ABOUTBOX }; }-3mPy(*%  
  //}}AFX_DATA n\.Vqe  
  // ClassWizard generated virtual function overrides 4YX3+oS  
  //{{AFX_VIRTUAL(CAboutDlg) 7`hP?a=  
 protected: =6#Eh=7N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %9RF   
  //}}AFX_VIRTUAL P A OJ\U  
  // Implementation hDq`Z$_+KX  
 protected: ,-e{(L  
  //{{AFX_MSG(CAboutDlg) .K<Q&  
  //}}AFX_MSG ED& `_h7?  
  DECLARE_MESSAGE_MAP() / Qk4  
}; 7( 2{'r  
Y7[jqb1D  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -\n@%$M]G  
{ 'oC) NpnH  
 //{{AFX_DATA_INIT(CAboutDlg) _H=Uwi_g  
 //}}AFX_DATA_INIT ~BkCp pI  
} |qZ1|  
[=]4-q6UN  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) M[112%[+4  
{ r{%qf;  
 CDialog::DoDataExchange(pDX); {T Ug. %u  
 //{{AFX_DATA_MAP(CAboutDlg) KFkoS0M5|  
 //}}AFX_DATA_MAP :TC@tM~Oy  
} q=qcm`ce  
U2~kJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) d6sye^P  
 //{{AFX_MSG_MAP(CAboutDlg) e,XYVWY%  
 // No message handlers M_w<m  
 //}}AFX_MSG_MAP e2W".+B1  
END_MESSAGE_MAP() h@]XBv  
 H =^`!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 3nnJ8zQ  
: CDialog(CCaptureDlg::IDD, pParent) Z} r*K%  
{ c>~*/%+  
 //{{AFX_DATA_INIT(CCaptureDlg) m&?r%x  
  m_bControl = FALSE; 1"M]3Kl  
  m_bAlt = FALSE; 2q4<t:!  
  m_bShift = FALSE; f\>M'{cV  
  m_Path = _T("c:\\"); +|89>}w4  
  m_Number = _T("0 picture captured."); oW Nh@C  
  nCount=0; 9lH?-~9  
  bRegistered=FALSE; x&T[*i  
  bTray=FALSE; LRG6:&  
 //}}AFX_DATA_INIT Gvqxi|  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2eol gXp  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6}Y#=}  
} 6s/&BR  
Zt.|oYH$  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) tX %5BTv  
{ '>ssqBnI  
 CDialog::DoDataExchange(pDX); Z//+Gw<'  
 //{{AFX_DATA_MAP(CCaptureDlg) .:QLk&a,:,  
  DDX_Control(pDX, IDC_KEY, m_Key); ,lA  s  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); "#oHYz3D  
  DDX_Check(pDX, IDC_ALT, m_bAlt); |! E)GahM  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); * 8_wYYH  
  DDX_Text(pDX, IDC_PATH, m_Path); :Ab%g-  
  DDX_Text(pDX, IDC_NUMBER, m_Number); lun\`f 5Q  
 //}}AFX_DATA_MAP %H&@^Tt a  
} B%76rEpvW;  
Rt!FPoN,y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) usCt#eZK  
//{{AFX_MSG_MAP(CCaptureDlg) H>B&|BO_[  
 ON_WM_SYSCOMMAND() ?9\EN|O^  
 ON_WM_PAINT() ,+xB$e  
 ON_WM_QUERYDRAGICON() 5}]"OXQ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) [^e%@TV>d  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) :~T99^$zA  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ~%=MpQ3  
//}}AFX_MSG_MAP uIZ-#q  
END_MESSAGE_MAP() MET' (m  
K&70{r  
BOOL CCaptureDlg::OnInitDialog() Slher0.Y  
{ giIWGa.a+  
 CDialog::OnInitDialog(); ,TN 2  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,>-< (Qi  
 ASSERT(IDM_ABOUTBOX < 0xF000); Z}l3l`h!  
 CMenu* pSysMenu = GetSystemMenu(FALSE); pDIVZC  
 if (pSysMenu != NULL) qHrA%k^!2O  
 { A?%H=>v$  
  CString strAboutMenu; ,5, !es@`b  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Id|L`  w  
  if (!strAboutMenu.IsEmpty()) W 7\f1}]H  
  { U\;6mK)M^J  
   pSysMenu->AppendMenu(MF_SEPARATOR); M#VE]J  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ps%q9}J  
  } `t9?=h!  
 } dEA6   
 SetIcon(m_hIcon, TRUE); // Set big icon O6/f5  
 SetIcon(m_hIcon, FALSE); // Set small icon db6b-Y{   
 m_Key.SetCurSel(0); lfz2~Si5A  
 RegisterHotkey(); fb8g7H|  
 CMenu* pMenu=GetSystemMenu(FALSE); uv(Sdiir8  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9qz6]-K  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); a]/>ra5{  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); vbBc}G"w  
 return TRUE; // return TRUE unless you set the focus to a control .#Z%1U%P.  
} #9xd[A : N  
m{uxI za  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )3w@]5j  
{ &[/w_| b  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )Es"LP]  
 { $lIz{ySJv  
  CAboutDlg dlgAbout; lBTmx(_}}r  
  dlgAbout.DoModal(); H {k^S\K  
 } * %M3PTY\  
 else ( ?{MEwHG  
 { Q=T&  
  CDialog::OnSysCommand(nID, lParam); j|%HIF25  
 } U,q\em R  
} 7C ,UDp|  
#Av.iAs  
void CCaptureDlg::OnPaint() ;@Z#b8aM}  
{ ?5 cI'  
 if (IsIconic()) ;)e2 @'Agl  
 { )'%$V%9  
  CPaintDC dc(this); // device context for painting #KXa&C  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); T{Uc:Z  
  // Center icon in client rectangle *B{j.{ p(  
  int cxIcon = GetSystemMetrics(SM_CXICON); ;Tc`}2  
  int cyIcon = GetSystemMetrics(SM_CYICON); &2zq%((r  
  CRect rect; p)3U7"q  
  GetClientRect(&rect); y+6o{`0  
  int x = (rect.Width() - cxIcon + 1) / 2; .dQQoyR+O  
  int y = (rect.Height() - cyIcon + 1) / 2; W.0L:3<"  
  // Draw the icon ^?]%sdT q  
  dc.DrawIcon(x, y, m_hIcon); ugx%_x6  
 } $.v5~UGb{\  
 else I{ :(z3  
 { Yf~{I-|`q  
  CDialog::OnPaint(); [$"n^5_~  
 } k]HEhY  
} (tGY%oT"  
P(73!DT+  
HCURSOR CCaptureDlg::OnQueryDragIcon() oK%K}{`  
{ P7MeX(Tay  
 return (HCURSOR) m_hIcon; V6#K2  
} S'B|>!z@  
Xo*%/0q'  
void CCaptureDlg::OnCancel() dwd:6.J(  
{ P*Tx14xe4  
 if(bTray) {aJJ `t  
  DeleteIcon(); >Ll$p 0W  
  CDialog::OnCancel(); @wC5 g 4E  
} i'wAE:Xe  
g9WGkH F  
void CCaptureDlg::OnAbout() YH_7=0EJ  
{ -!L"')  
 CAboutDlg dlg; X'% ;B  
 dlg.DoModal(); 1YJC{bO  
} ku a) K!  
0}xFD6{X  
void CCaptureDlg::OnBrowse() k`p74MWu  
{ 9Q-*@6G  
 CString str; ]&{ci  
 BROWSEINFO bi; TkO[rAC  
 char name[MAX_PATH]; gzD@cx?V  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ?9=9C"&s  
 bi.hwndOwner=GetSafeHwnd(); =)` p_W  
 bi.pszDisplayName=name; p6XtTx  
 bi.lpszTitle="Select folder"; A4?+T+#d  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; STw#lU) %(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); u@%r  
 if(idl==NULL) -TOIc%  
  return; @*DyZB  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); T,OwM\`.X{  
 str.ReleaseBuffer(); Z@%HvB7  
 m_Path=str; W|,V50K  
 if(str.GetAt(str.GetLength()-1)!='\\') V$rlA' +1v  
  m_Path+="\\"; .*JA!B  
 UpdateData(FALSE); uH;-z_Wpn!  
} "AhTH.ZP  
wgRs Z  
void CCaptureDlg::SaveBmp() r]Ff{la5  
{ AVU>+[.=%c  
 CDC dc; }AvcoD/b  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "h7tnMS  
 CBitmap bm; h<\_XJJ  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3o|I[!2.  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,mL !(US  
 bm.CreateCompatibleBitmap(&dc,Width,Height); v^7LctcVm  
 CDC tdc; C}*cx$.  
 tdc.CreateCompatibleDC(&dc); &h,5:u  
 CBitmap*pOld=tdc.SelectObject(&bm); ,*@AX>  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); NCf"tK'5n  
 tdc.SelectObject(pOld); ,xT?mt}P  
 BITMAP btm; 6Ik,zQL  
 bm.GetBitmap(&btm); leiW4Fj  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Y}DonF  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 45H!;Q sk  
 BITMAPINFOHEADER bih; @i3bgx>_o  
 bih.biBitCount=btm.bmBitsPixel; 5]1h8PW!Y  
 bih.biClrImportant=0; pBC<u  
 bih.biClrUsed=0; {A o,t+j  
 bih.biCompression=0; 9lo [&^<  
 bih.biHeight=btm.bmHeight; 'snYu!`z  
 bih.biPlanes=1; iY bX  
 bih.biSize=sizeof(BITMAPINFOHEADER); cubk]~VD  
 bih.biSizeImage=size; HOp-P8z  
 bih.biWidth=btm.bmWidth; ='E$-_  
 bih.biXPelsPerMeter=0; !"TZ:"VZU  
 bih.biYPelsPerMeter=0; -gz0md|Y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )P>u9=?,=E  
 static int filecount=0; D8# on!  
 CString name; N6[i{;K@N{  
 name.Format("pict%04d.bmp",filecount++); Gj /3kS~@  
 name=m_Path+name; ,s^<X85gp\  
 BITMAPFILEHEADER bfh; 6dEyv99  
 bfh.bfReserved1=bfh.bfReserved2=0; PZD>U)M  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ib0g3p-Lc  
 bfh.bfSize=54+size; #9LzY  
 bfh.bfOffBits=54; {hO`6mr&t  
 CFile bf; t=#Pya  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @l UlY2  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); O8N[Jl  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); v}v 5  
  bf.WriteHuge(lpData,size); www`=)A;  
  bf.Close(); lKEa)KF[  
  nCount++; =qvZpB7ZZ  
 } WnAd5#G  
 GlobalFreePtr(lpData); C+MSVc  
 if(nCount==1) pD@zmCU  
  m_Number.Format("%d picture captured.",nCount);  [&P`ak  
 else >LF&EM]  
  m_Number.Format("%d pictures captured.",nCount); ! qJI'+_  
  UpdateData(FALSE); e^$j5jV  
} ELh3 ^  
;S/7 h6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) O:.,+,BH  
{ i`O rMzL  
 if(pMsg -> message == WM_KEYDOWN) qU[O1bN  
 { !|m9|  
  if(pMsg -> wParam == VK_ESCAPE) P l{QOR  
   return TRUE; <V_7|)'/A  
  if(pMsg -> wParam == VK_RETURN) :a< hQ|p  
   return TRUE; qA/bg  
 } `HX3|w6W;  
 return CDialog::PreTranslateMessage(pMsg); S9Yt1qb  
} 0d\~"4 R  
1=Ilej1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y?N Nz0  
{ ;~sr$6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ y>(rZ^y&  
  SaveBmp(); PtKTm\,JL0  
  return FALSE; Ws49ImCB  
} C 7n Kk/r  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ '0+$ m=   
 CMenu pop; XSB8z   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); U 0ZB^`  
 CMenu*pMenu=pop.GetSubMenu(0); $ehg@WK}.  
 pMenu->SetDefaultItem(ID_EXITICON); {&nV4c$v  
 CPoint pt; B[xR-6phW  
 GetCursorPos(&pt); \].J-^=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); TvrwVL)  
 if(id==ID_EXITICON) M<qudi  
  DeleteIcon(); XS0V:<+,  
 else if(id==ID_EXIT) 4=p@2g2"H  
  OnCancel(); u;n(+8sz  
 return FALSE; H,>#|F  
} _@ i>s,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); vO$ra5Z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) cztS]dcf>~  
 AddIcon(); 9)Yw :  
 return res; J#7(]!;F  
} v'nHFC+p  
G6Q4-kcK  
void CCaptureDlg::AddIcon() 5L &:_iQZy  
{ VBx,iuaw  
 NOTIFYICONDATA data; [$2qna2VP  
 data.cbSize=sizeof(NOTIFYICONDATA); VC=6uB  
 CString tip; ${e&A^h  
 tip.LoadString(IDS_ICONTIP); D_aR\  
 data.hIcon=GetIcon(0); )Z:m)k>r;  
 data.hWnd=GetSafeHwnd(); HIPL!ss]  
 strcpy(data.szTip,tip);  6`"ZsO  
 data.uCallbackMessage=IDM_SHELL; MxN]7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; R]=SWE}U  
 data.uID=98; ZW* fOaj  
 Shell_NotifyIcon(NIM_ADD,&data); \Ut S>4w\  
 ShowWindow(SW_HIDE); 3o7xN=N  
 bTray=TRUE; fm6]CU1^  
} J3\)Jy  
3*\8p6G  
void CCaptureDlg::DeleteIcon() 8D T@h8tA  
{ em/Xu  
 NOTIFYICONDATA data; 2B'^`>+8S  
 data.cbSize=sizeof(NOTIFYICONDATA); *dVD  
 data.hWnd=GetSafeHwnd(); F`D 9Zfd  
 data.uID=98; Nz @8  
 Shell_NotifyIcon(NIM_DELETE,&data); !pS~'E&q  
 ShowWindow(SW_SHOW); v|To+ P6b  
 SetForegroundWindow();  . X0t"  
 ShowWindow(SW_SHOWNORMAL); K-<n`zg3  
 bTray=FALSE; ./)j5M  
} J/gQQ. s  
(lb`#TTGx  
void CCaptureDlg::OnChange() &U0WkW   
{  /Ef4EX0  
 RegisterHotkey(); |QqWVelc  
} dAwS<5!  
wL'C1Vr  
BOOL CCaptureDlg::RegisterHotkey() < [ w++F~  
{ `^f}$R|  
 UpdateData(); K*[0dza$  
 UCHAR mask=0; 9T]va]w?#  
 UCHAR key=0; Vd[  2u  
 if(m_bControl) KPg[-d  
  mask|=4; \ >(zunL  
 if(m_bAlt) FP@ A;/c  
  mask|=2; UR\ZN@O  
 if(m_bShift) }9 FD/  
  mask|=1; 1YFAr}M  
  key=Key_Table[m_Key.GetCurSel()]; x/[8Wi,yB  
 if(bRegistered){ K5+!(5V~  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %)dI2 J^Xf  
  bRegistered=FALSE; :3 PGf  
 } -|$*l Q  
 cMask=mask; e Ri!\Fx  
 cKey=key; _jk|}IB;X  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]t7ClT)n!  
 return bRegistered; wz)m{:b<  
} |H<|{{E  
*\C}Ok=  
  四、小结 }RH lYN  
}P16Xb)p  
  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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