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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: w7V\_^&Id  
  L=r*bq  
  一、实现方法 hH8&g%{2  
dZU#lg  
  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: ^,>w`8  
P0m3IH)  
#pragma data_seg("shareddata") )>iOj50n3  
HHOOK hHook =NULL; //钩子句柄 .-KI,IU  
UINT nHookCount =0; //挂接的程序数目 nI\6a G?`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Z}J5sifr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 f!9i6  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey lB,1dw2(T  
static int KeyCount =0; UerbNz|  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 >HP `B2Q H  
#pragma data_seg() )U@9dV7u  
53HA6:Q[  
  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。 ~||0lj.D  
/eF@a!  
  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: i9;  
bdg6B7%Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR s2; ~FK#/  
cKey,UCHAR cMask) ge~@}&#iO@  
{ .H" ?& Mf  
 BOOL bAdded=FALSE; hsC T:1i  
 for(int index=0;index<MAX_KEY;index++){ NAGM3{\5v$  
  if(hCallWnd[index]==0){ X?5{2ulrI  
   hCallWnd[index]=hWnd; |R`"Zu`  
   HotKey[index]=cKey; R'>!1\?Iq  
   HotKeyMask[index]=cMask; T+kV~ w{  
   bAdded=TRUE; o?`FjZ6;x  
   KeyCount++; mMAN* }`O  
   break; ;*A'2ymXUT  
  } l5[5Y6c>  
 }  YKyno?m  
 return bAdded; 3:)z+#Uk6  
} SyWZOE%p  
//删除热键 I'/3_AX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L5&M@YTH  
{ GAz -yCJp  
 BOOL bRemoved=FALSE; _D '(R  
 for(int index=0;index<MAX_KEY;index++){ EL 5+pt  
  if(hCallWnd[index]==hWnd){ pgU [di  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ acd[rjeT  
    hCallWnd[index]=NULL; 9/ <3mF@E  
    HotKey[index]=0; "#Rh\DQ  
    HotKeyMask[index]=0; Hfcpqa  
    bRemoved=TRUE; SE'Im  
    KeyCount--; %yRXOt2(  
    break; mQ"~x]  
   } kf, &t   
  } Fr9/TI  
 } e4z`:%vy  
 return bRemoved; YQBLbtn6(  
} p~D}Iyww1_  
q m3\) 9C  
w"hd_8cO  
  DLL中的钩子函数如下: iRQ!J1SGcG  
Aoe\\'O|V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8z=# 0+0  
{ TW|K.t@5#H  
 BOOL bProcessed=FALSE; (3Db}Hnn  
 if(HC_ACTION==nCode) c%H' jB [  
 { ?Ga8.0Z~KT  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 #;[G>-tC  
   switch(wParam) u`bD`kfT>  
   {  n (Um/  
    case VK_MENU: raMtTL+  
     MaskBits&=~ALTBIT; qzu(4*Gk6  
     break; 7G Jhc  
    case VK_CONTROL: 0^d<@\  
     MaskBits&=~CTRLBIT; Z3X9-_g  
     break; lvR>%I0`*  
    case VK_SHIFT: MiMDEe%f%  
     MaskBits&=~SHIFTBIT; &~=d;llkT  
     break; \`*]}48Z  
    default: //judge the key and send message Pf3F)y[=  
     break; 9G[t &r  
   } :{-/b  
   for(int index=0;index<MAX_KEY;index++){ hu~XFRw15  
    if(hCallWnd[index]==NULL) Q_k'7Z\g$  
     continue; @A-E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B\~(:(OPM]  
    { <CS,v)4,nH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i06|P I  
     bProcessed=TRUE; zRm@ |IT  
    } ztC,[   
   } 8`|Z9umW*  
  } ]-w.x ]I  
  else if((lParam&0xc000ffff)==1){ //有键按下 [QwqP=-6  
   switch(wParam) w!Ii   
   { -Y>QKS  
    case VK_MENU: bZgFea_>i  
     MaskBits|=ALTBIT; l~x 6R~q  
     break; EB p(^r j  
    case VK_CONTROL: [-nPHmZV[  
     MaskBits|=CTRLBIT; \IOF 9) F  
     break; 6PLdzZ{  
    case VK_SHIFT: CmtDfE  
     MaskBits|=SHIFTBIT; z2;<i|Ez0  
     break; u/` t+-A  
    default: //judge the key and send message J>+~//C  
     break; v;Rm42k  
   } $A)[s$  
   for(int index=0;index<MAX_KEY;index++){ %)y-BdSp.  
    if(hCallWnd[index]==NULL) )yS S2  
     continue; I5W#8g!{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /,+&O#SX  
    { (usPAslr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 88zK)k{  
     bProcessed=TRUE; ^:ehG9  
    } A3Vj3em  
   } mHc5NkvQC  
  } F7`[r9 $  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 C=DC g  
   for(int index=0;index<MAX_KEY;index++){ )fbYP@9>a  
    if(hCallWnd[index]==NULL) 3/CKy##r%]  
     continue; y+M9{[ i/O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) h:r:qk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G@,XUP  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 DhiIKd9W  
   } P?<G:]W  
  } *YP;HL  
 } ^x}k1F3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $6/CTQ  
} %"AB\lL.  
4l_~-Peh  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: LbnW(wr6:(  
p9~$}!ua  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ji0FHa_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1-8 G2e  
2E@y0[C?  
  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: eJ60@N\A  
b yX)4&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _kUtj(re  
{ 8]l(D  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) luCwP  
 { T0%l$#6v  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Z4D[nPm$  
  SaveBmp(); /vw$3,*z  
  return FALSE; =$\9t$A  
 } dg@'5.ApPu  
 …… //其它处理及默认处理 M[7$F&&n  
} i?'|}tK  
k6(0:/C  
1krSX 2L  
  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。 p4z thdN[  
qR9!DQc'  
  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。 Xt$Y&Ho  
oVIc^yk5a  
  二、编程步骤 NPLJ*uHH  
sv+ 6#  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; }hS$F  
WUGFo$ xA  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )Qh*@=$-  
YGOhUT |  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; fY!9i5@'  
B9S@G{`  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; &M6Zsmo  
jm,cVo  
  5、 添加代码,编译运行程序。 0t6DD  
a.fdCI]%  
三、程序代码 S%df'bh$  
\hg%J/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &o'$uLF~Y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /&zlC{:G92  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 'q1cc5(ueV  
#if _MSC_VER > 1000 z+<ofZ(.  
#pragma once 6bT>x5?  
#endif // _MSC_VER > 1000 4++pK;I  
#ifndef __AFXWIN_H__ )Kq@ m1>@  
#error include 'stdafx.h' before including this file for PCH Hd_,`W@  
#endif =4gPoS  
#include "resource.h" // main symbols z[0tM&pv  
class CHookApp : public CWinApp W6V((84(O  
{ FA{(gib@9  
 public: D+{& zo  
  CHookApp(); -x-EU#.G  
  // Overrides O"J"H2}S  
  // ClassWizard generated virtual function overrides Wjr^: d  
  //{{AFX_VIRTUAL(CHookApp) +NVXFjPC  
 public: 0U?(EJ  
  virtual BOOL InitInstance(); 0KA@ ]!  
  virtual int ExitInstance(); |BXp`  
  //}}AFX_VIRTUAL F12$BK DH  
  //{{AFX_MSG(CHookApp) &FWz7O>1  
  // NOTE - the ClassWizard will add and remove member functions here. 3ej[  
  // DO NOT EDIT what you see in these blocks of generated code ! pRA%07?W  
  //}}AFX_MSG "G@(Cb*+T  
  DECLARE_MESSAGE_MAP() aI 1tG  
}; F:8@ ]tA&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); jtgj h\Nt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nK#%Od{GF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G|TnvZ KX  
BOOL InitHotkey(); k}!'@  
BOOL UnInit(); BDLJDyf B  
#endif gy xC)br  
QwL*A `@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ll*Ez"  
#include "stdafx.h" h=^UMat-  
#include "hook.h" X$_pDF&\z  
#include <windowsx.h> TSVlZy~Xo  
#ifdef _DEBUG dFmpx%+p  
#define new DEBUG_NEW e$E>6Ngsr  
#undef THIS_FILE L nyow}  
static char THIS_FILE[] = __FILE__; HubK  
#endif ZO>)GR2S  
#define MAX_KEY 100 t*`Sme]"B  
#define CTRLBIT 0x04 Rln\  
#define ALTBIT 0x02 N1"p ;czK  
#define SHIFTBIT 0x01 ;te( {u+  
#pragma data_seg("shareddata") t#w,G  
HHOOK hHook =NULL; }z qo<o  
UINT nHookCount =0; ppGWh  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =sF4H_B  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8,(--A  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 2#N?WlYw<S  
static int KeyCount =0; n3j_=(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift %evtIU<h  
#pragma data_seg() wN^^_  
HINSTANCE hins; 6C/Pu!Sx?  
void VerifyWindow(); oDayfyy4y)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) b_7LSp  
//{{AFX_MSG_MAP(CHookApp) >pe!T aBN  
// NOTE - the ClassWizard will add and remove mapping macros here. r! [Qpb-:  
// DO NOT EDIT what you see in these blocks of generated code! )0g!lCfb  
//}}AFX_MSG_MAP "c.-`1,t  
END_MESSAGE_MAP() A[F_x*S  
Pq@ -`sw  
CHookApp::CHookApp() ?FwHqyFVlQ  
{ <{@D^L6h  
 // TODO: add construction code here, T(Bcp^N  
 // Place all significant initialization in InitInstance eu":\ks  
} 7|jy:F,w%  
h<8c{RuoZC  
CHookApp theApp; I zVc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]2YC7  
{ \HG4i/V:h  
 BOOL bProcessed=FALSE; l/"!}wF  
 if(HC_ACTION==nCode) u:tcL-;U  
 { !6a;/ys  
  if((lParam&0xc0000000)==0xc0000000){// Key up 6']G HDK  
   switch(wParam) \DWKG~r-%  
   { )u4=k(  
    case VK_MENU: pred{HEye  
     MaskBits&=~ALTBIT; TjI&8#AWBA  
     break; Q laoa)d#  
    case VK_CONTROL: u J]uz%  
     MaskBits&=~CTRLBIT; xxr'g =  
     break; W\ mgM2p  
    case VK_SHIFT: -]{ _^  
     MaskBits&=~SHIFTBIT; XB B>"  
     break; S%B56|'  
    default: //judge the key and send message atw*t1)g  
     break; gm =C0Sp?  
   } 9W_mSum  
   for(int index=0;index<MAX_KEY;index++){ q&_\A0  
    if(hCallWnd[index]==NULL) j>l  
     continue; f8V )nM+v"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )X:Sfk  
    { y7+n*|H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); SuNc&e#(  
     bProcessed=TRUE; BwGOn)KL  
    } -B! a O65^  
   } }Kp$/CYd  
  } %M/L/_d  
  else if((lParam&0xc000ffff)==1){ //Key down dw!Xt@,[g{  
   switch(wParam) {'B(S/Z 7  
   { bv7xh*/  
    case VK_MENU: "%S-(ue:  
     MaskBits|=ALTBIT; 5w{U/v$Z  
     break; ZNpC& "`G  
    case VK_CONTROL: *uP;rUY  
     MaskBits|=CTRLBIT; e'c3.sQ|?  
     break; qs= i+  
    case VK_SHIFT: B1s&2{L6K  
     MaskBits|=SHIFTBIT; E>gLUMG$  
     break; 59v=\; UI  
    default: //judge the key and send message iT s" RW  
     break; 2V$Jn8v,`{  
   } ="f-I9y  
   for(int index=0;index<MAX_KEY;index++) -nX{&Z3-s  
   { g>eWX*Pa|  
    if(hCallWnd[index]==NULL) p_e x  
     continue; qW|h"9sr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0(9gTxdB  
    { 7;C~>WlU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _3O*"S=1  
     bProcessed=TRUE; |u$*'EsP  
    } gp~-n7'~O  
   } W<[7LdAB  
  } B# .xs>{N  
  if(!bProcessed){ B<h4ZK%  
   for(int index=0;index<MAX_KEY;index++){ $Fy~xMA8O  
    if(hCallWnd[index]==NULL) gbh/ `  
     continue; )te_ <W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) qoZAZ&|HI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D&@ js!|5  
   } M19 5[]  
  } RZSEcRlN  
 } R$MR|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (Ia:>ocE0  
} 6z/&j} (  
mUR[;;l  
BOOL InitHotkey() )=aq j@v  
{ {l_D+B;  
 if(hHook!=NULL){ -x J\/"A  
  nHookCount++; ~)X;z"y%b  
  return TRUE;  :J)^gc  
 } Et}%sdS  
 else 9c1q:>|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); v]KPA.W  
  if(hHook!=NULL) $[J\sokpY  
   nHookCount++; 3=UufI  
  return (hHook!=NULL); 6Q+VW_~  
} e U-A_5  
BOOL UnInit() I>-}ys`[  
{ a<+Rw{  
 if(nHookCount>1){ Ml +f3#HP  
  nHookCount--; *|0W3uy\Y  
  return TRUE; hKsx7`[  
 } X\<a|/{V A  
 BOOL unhooked = UnhookWindowsHookEx(hHook); `<Hc,D; p  
 if(unhooked==TRUE){ soKR*gJ,  
  nHookCount=0; E!I4I'  
  hHook=NULL; (m.jC}J  
 } 8-K4*(-dL  
 return unhooked; X&K,,C  
} $.B}zY{  
Ox'K C  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !yV)EJ:$  
{ jar?"o  
 BOOL bAdded=FALSE; 5=4-IO6W[]  
 for(int index=0;index<MAX_KEY;index++){ 3|Ar~_]  
  if(hCallWnd[index]==0){ -**fT?n  
   hCallWnd[index]=hWnd; %u]>K(tU  
   HotKey[index]=cKey; O9p^P%U"  
   HotKeyMask[index]=cMask; 0XL[4[LdA  
   bAdded=TRUE; i{J[;rV9  
   KeyCount++; gJzS,g1]  
   break; W*4!A\K  
  } 6|%HCxWO  
 } 2L1Azx  
 return bAdded; $g#d1u0q  
} qZSW5lC0  
dBW#PRg  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mOYXd,xd  
{ -ktYS(8&  
 BOOL bRemoved=FALSE; b55G1w  
 for(int index=0;index<MAX_KEY;index++){ y"nC T3  
  if(hCallWnd[index]==hWnd){ xtp55"g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ jH4Wu`r;m  
    hCallWnd[index]=NULL; K%vGfQ8Er-  
    HotKey[index]=0; Lismo#  
    HotKeyMask[index]=0; @(rLn  
    bRemoved=TRUE; ;nf}O87~  
    KeyCount--; ]}A yDy6C  
    break; DAd$u1  
   } 11yS2D   
  } g|4v>5Y  
 } DRi/<  
 return bRemoved; faI4`.i  
} H0mDs7  
=TXc - J  
void VerifyWindow() ~9+\  
{ ~bJ*LM?wOP  
 for(int i=0;i<MAX_KEY;i++){ R )e^H  
  if(hCallWnd!=NULL){ CB?H`R pC.  
   if(!IsWindow(hCallWnd)){ = G3A}  
    hCallWnd=NULL; 9L9mi<,  
    HotKey=0; 90)rOD1B  
    HotKeyMask=0; YyR~pT#ffT  
    KeyCount--; aw/5#(1R  
   } &rxR"^x\  
  } /d-7n|#E  
 } 6T~xjAuJ3T  
} -^7n+ QX  
D$c4's `5  
BOOL CHookApp::InitInstance() \7,'o] >M-  
{ 6e;.}i  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); tMy@'nj  
 hins=AfxGetInstanceHandle(); Z?-l-s K  
 InitHotkey(); 1e^-_Bo6'o  
 return CWinApp::InitInstance(); K<+h/Ok  
} {%b-~& F9  
JEes'H}Y  
int CHookApp::ExitInstance() ];go?.*C  
{ |bz,cvlP W  
 VerifyWindow(); +<H)DPG<  
 UnInit(); hw&R .F  
 return CWinApp::ExitInstance(); R#Bdfmld q  
} u-. _;  
X;0DQnAI8j  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file kSw.Q2ao  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) qzqv-{.h  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ K(HP PM\  
#if _MSC_VER > 1000 qyuU  
#pragma once DQQjx>CK  
#endif // _MSC_VER > 1000 OyZ>R~c'B  
R7b*(33  
class CCaptureDlg : public CDialog Db:WAjU  
{ He23<hd!  
 // Construction }TLC b/+  
 public: {<8#T`I  
  BOOL bTray; I2Rp=L:z5  
  BOOL bRegistered; q0<`XDD`  
  BOOL RegisterHotkey(); =Bx~'RYl1d  
  UCHAR cKey; KPqI(  
  UCHAR cMask; %c{)'X  
  void DeleteIcon(); IGQ8-#=  
  void AddIcon(); y>PbYjuIU  
  UINT nCount; [AwE  
  void SaveBmp(); \OH:xW~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor yh<aFYdk  
  // Dialog Data x{5*%}lX8  
  //{{AFX_DATA(CCaptureDlg) r"{1H  
  enum { IDD = IDD_CAPTURE_DIALOG }; ~`.%n7  
  CComboBox m_Key; xn[di-L F  
  BOOL m_bControl; WRM}gWv*  
  BOOL m_bAlt; ?Fv(4g  
  BOOL m_bShift; oc Uu  
  CString m_Path; #YdU,y=B  
  CString m_Number; N"y4#W(Z@  
  //}}AFX_DATA "(GeW286k  
  // ClassWizard generated virtual function overrides _>I5Ud8(-  
  //{{AFX_VIRTUAL(CCaptureDlg) M$9h)3(B  
 public: 3\ed4D  
  virtual BOOL PreTranslateMessage(MSG* pMsg); :f:C*mYvu  
 protected: *ni|I@8  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I^=M>_ s4  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); o~p^`5#  
  //}}AFX_VIRTUAL M`'2 a  
  // Implementation Sq%R  
 protected: ,88}5)b[  
  HICON m_hIcon; 2t<CAKBB  
  // Generated message map functions Sq>UMfl&  
  //{{AFX_MSG(CCaptureDlg) j/&7L@Y  
  virtual BOOL OnInitDialog(); zT8K})#  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %3wK.tR  
  afx_msg void OnPaint(); tTal<4  
  afx_msg HCURSOR OnQueryDragIcon(); aL}_j#m{  
  virtual void OnCancel(); mDUS9>  
  afx_msg void OnAbout(); ,*US) &x  
  afx_msg void OnBrowse(); `'`XB0vb  
  afx_msg void OnChange(); cxV3Vrx@A  
 //}}AFX_MSG = 1C9lKm  
 DECLARE_MESSAGE_MAP() sKtH4d5)  
}; zuw6YY8kQ  
#endif w'C(? ?mH  
va\cE*,@ns  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file IV76#jL  
#include "stdafx.h" fqxMTTg@  
#include "Capture.h" $1YnQgpT  
#include "CaptureDlg.h" Wp $\>  
#include <windowsx.h> %?ad.F+7  
#pragma comment(lib,"hook.lib") I5{SC-7  
#ifdef _DEBUG \oyr[so(i  
#define new DEBUG_NEW <pCZ+Yv E"  
#undef THIS_FILE wbTw\b=  
static char THIS_FILE[] = __FILE__; t V</ x0#  
#endif WD<M U ]  
#define IDM_SHELL WM_USER+1 V0>,Kxk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;IyQqP#,<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _F3:j9^  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 7y!{lr=n  
class CAboutDlg : public CDialog {8eNQ-4I  
{ SyI#Q[f'_  
 public: 6B=J*8 Hs  
  CAboutDlg(); h1xYQF_`Z  
  // Dialog Data [1Rs~T"  
  //{{AFX_DATA(CAboutDlg) ] '..G-  
  enum { IDD = IDD_ABOUTBOX }; K=V)"v5o3  
  //}}AFX_DATA iVE+c"c!2&  
  // ClassWizard generated virtual function overrides ?o2L  
  //{{AFX_VIRTUAL(CAboutDlg) t2>Vj>U  
 protected: @>?&Mw\c  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V<b"jCXI  
  //}}AFX_VIRTUAL IsI\T8yfc  
  // Implementation >Tw|SK+3  
 protected: qSON3Iid  
  //{{AFX_MSG(CAboutDlg) O3S_P]{*ny  
  //}}AFX_MSG uXXwMc<p  
  DECLARE_MESSAGE_MAP() Tw$lakw  
}; uv,t(a.^  
Q!c*2hI  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /IODRso/!  
{ UPH:$Fk&  
 //{{AFX_DATA_INIT(CAboutDlg) \\_Qv  
 //}}AFX_DATA_INIT KdUmetx1  
} YDP<  
VgOj#Z?K  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {$b]K-B  
{ %A04'dj`zQ  
 CDialog::DoDataExchange(pDX); :WE(1!P@  
 //{{AFX_DATA_MAP(CAboutDlg) [E+#+-n7  
 //}}AFX_DATA_MAP ^8DC W`V  
} |dXmg13( -  
d+$a5 [^9  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) aB.`'d)V  
 //{{AFX_MSG_MAP(CAboutDlg) Pn0V{SJOJ%  
 // No message handlers 0GEK xV\F  
 //}}AFX_MSG_MAP .Um.dXBYU  
END_MESSAGE_MAP() n>{ >3?  
X2~>Z^, U  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) t\X5B]EZ  
: CDialog(CCaptureDlg::IDD, pParent) ):1NeJOFF  
{ A~u-Iv(U  
 //{{AFX_DATA_INIT(CCaptureDlg) i!9yN: m0  
  m_bControl = FALSE; ;kY'DKL(  
  m_bAlt = FALSE; |,|b~>  
  m_bShift = FALSE; p\1-.  
  m_Path = _T("c:\\"); 6s@'z<Ct  
  m_Number = _T("0 picture captured."); y]yp8Bs+  
  nCount=0; !q mnMY$  
  bRegistered=FALSE; F.zn:yX5  
  bTray=FALSE; gq!| 0  
 //}}AFX_DATA_INIT q<dZy? f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %&0_0BU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); WbB0{s  
} s0WI93+z  
^h1EE=E"  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {dTtYL$'"  
{ F<VoPqHq  
 CDialog::DoDataExchange(pDX); 9v=5x[fE  
 //{{AFX_DATA_MAP(CCaptureDlg) 8SR~{  
  DDX_Control(pDX, IDC_KEY, m_Key); eJlTCXeZ|  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 4*&_h g)h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); kO>F, M  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); i{vM NI{  
  DDX_Text(pDX, IDC_PATH, m_Path); 6SJ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8bd&XieE  
 //}}AFX_DATA_MAP W6:ei.d+NS  
} ~ (I'm[  
*EY^t=  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;H}XW=vO  
//{{AFX_MSG_MAP(CCaptureDlg) vau0Jn%=ck  
 ON_WM_SYSCOMMAND() QpbyC_:;$4  
 ON_WM_PAINT() kqdF)Wa am  
 ON_WM_QUERYDRAGICON() {]ie|>'=C  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) WrP 4*6;"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) MZ]#9/  
 ON_BN_CLICKED(ID_CHANGE, OnChange) x=s=~cu4,  
//}}AFX_MSG_MAP ruiAEC<Ej  
END_MESSAGE_MAP() qD0sD2 x  
!(QDhnx}9c  
BOOL CCaptureDlg::OnInitDialog() K)=<hL  
{ ay4E\=k  
 CDialog::OnInitDialog(); M`{~AIqd(  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 6d4)7PL  
 ASSERT(IDM_ABOUTBOX < 0xF000); tgz  
 CMenu* pSysMenu = GetSystemMenu(FALSE); oS.fy31p  
 if (pSysMenu != NULL) bruM#T@}  
 { fg}&=r  
  CString strAboutMenu; a8$gXX-2  
  strAboutMenu.LoadString(IDS_ABOUTBOX); St 4YNS.|  
  if (!strAboutMenu.IsEmpty()) /1OzX'5f  
  { BTi:Bcv k  
   pSysMenu->AppendMenu(MF_SEPARATOR); Tp-<!^o4  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I#?NxP\S  
  } "eRf3Q7w:  
 } fZ8at  
 SetIcon(m_hIcon, TRUE); // Set big icon X=_`$ 0  
 SetIcon(m_hIcon, FALSE); // Set small icon bvpP/LeY  
 m_Key.SetCurSel(0); \l$gcFXb  
 RegisterHotkey(); ~Q4 emgBD  
 CMenu* pMenu=GetSystemMenu(FALSE); Rd#V,[d  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); |^ K"#K  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [,_4#Zz  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); X%1j-;Wr@  
 return TRUE; // return TRUE unless you set the focus to a control ^ hoz<Ns  
} I"AgRa  
ciQG.]  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X }UR\8g  
{ mI;#Zq_j  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) YSQB*FBz  
 { _hK83s4  
  CAboutDlg dlgAbout; qQz f&"  
  dlgAbout.DoModal(); 8+gti*C?\  
 } OanHG  
 else 1#o>< ?  
 { +vR$%  
  CDialog::OnSysCommand(nID, lParam); aDXdr\ C6  
 } SiBhf3   
} \=kre+g  
Cq-d,  
void CCaptureDlg::OnPaint() g`(' k5=  
{ Y6J7N^  
 if (IsIconic()) ,VtrQb)Yf  
 { XI>|"*-l  
  CPaintDC dc(this); // device context for painting M@LI(;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .'+*>y!  
  // Center icon in client rectangle z?a<&`W  
  int cxIcon = GetSystemMetrics(SM_CXICON); N;)Y+amg^  
  int cyIcon = GetSystemMetrics(SM_CYICON); a-P 'h1hbH  
  CRect rect; ?B&Z x-krd  
  GetClientRect(&rect); 1Tn0$+$.4  
  int x = (rect.Width() - cxIcon + 1) / 2; M!KHBr  
  int y = (rect.Height() - cyIcon + 1) / 2; ?52{s"N0>  
  // Draw the icon Cpyv@+;D  
  dc.DrawIcon(x, y, m_hIcon); <4caG2~q  
 } [P'crV,m  
 else je9eJUKE  
 { iti~RV,  
  CDialog::OnPaint(); @PYCl  
 } x2 s%qZ#  
} . kv/db  
pP1|/f5n`  
HCURSOR CCaptureDlg::OnQueryDragIcon() H,/|pP.  
{ Afpj*o  
 return (HCURSOR) m_hIcon; qNhV zx  
}  zw13Tu  
6mFH>T*jzH  
void CCaptureDlg::OnCancel() SAuZWA4g[  
{ 994   
 if(bTray) ;g-L2(T05;  
  DeleteIcon(); ! OM P]  
  CDialog::OnCancel(); t}Z*2=DO  
} R"j6 w[tn  
a6UW,n"n  
void CCaptureDlg::OnAbout() nG0Uv%?{pj  
{ 9t`Z_HwdCb  
 CAboutDlg dlg; _h@s)"  
 dlg.DoModal();  QuJ~h}k  
} Fx^e%":@ip  
IW48Sg  
void CCaptureDlg::OnBrowse() UfE41el:  
{ |sM#nhxK  
 CString str; %]>LnbM>4  
 BROWSEINFO bi; 1QfOD-lv  
 char name[MAX_PATH]; ZBDEE+8e  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); SC'F,!  
 bi.hwndOwner=GetSafeHwnd(); Ol;}+?[Q  
 bi.pszDisplayName=name; D$sG1*@s-  
 bi.lpszTitle="Select folder"; R~z@voM*<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; $VX<UK$|s  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); AR<'Airi:  
 if(idl==NULL) =r<0l=  
  return; 6bL"ZOEu  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9fWr{fx  
 str.ReleaseBuffer(); {{FA "NW  
 m_Path=str; Dxc`K?M   
 if(str.GetAt(str.GetLength()-1)!='\\') ?V6+o`bm  
  m_Path+="\\"; ELF,T (  
 UpdateData(FALSE); Cm4$&?  
} ^1&xt(G  
@ 2mJh^cj  
void CCaptureDlg::SaveBmp() euM7> $`  
{ vm)&WEL!  
 CDC dc; gZgb-$b  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fGJPZe  
 CBitmap bm; ahkSEE{  
 int Width=GetSystemMetrics(SM_CXSCREEN); ;]?1i4p)  
 int Height=GetSystemMetrics(SM_CYSCREEN); ;HM& ":7  
 bm.CreateCompatibleBitmap(&dc,Width,Height); z 8M^TV  
 CDC tdc; 6\)61o_1|  
 tdc.CreateCompatibleDC(&dc); Zo`'xg  
 CBitmap*pOld=tdc.SelectObject(&bm); (,PO(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,v:m  
 tdc.SelectObject(pOld); 7]Y Le+Ds  
 BITMAP btm; Eom|*2vWIC  
 bm.GetBitmap(&btm); <OF7:f  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Mw@T!)(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); oju7<b9Ez  
 BITMAPINFOHEADER bih; ^AMcZ6!\  
 bih.biBitCount=btm.bmBitsPixel; 0\%/:2   
 bih.biClrImportant=0; h@FDP#H  
 bih.biClrUsed=0; T F&xiL^  
 bih.biCompression=0; 8 s!0Z1Roc  
 bih.biHeight=btm.bmHeight; O^hWG ~o  
 bih.biPlanes=1; LF <fp&C)h  
 bih.biSize=sizeof(BITMAPINFOHEADER); aOfL;I  
 bih.biSizeImage=size; D61CO-E(D  
 bih.biWidth=btm.bmWidth; OwV>`BIwns  
 bih.biXPelsPerMeter=0; -_.)~ )P  
 bih.biYPelsPerMeter=0; kVw5z3]Xg  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _)Q) tOW  
 static int filecount=0; mq$'\c 9.  
 CString name; 8I04Nx  
 name.Format("pict%04d.bmp",filecount++); mJRvC%  
 name=m_Path+name; |r1\  
 BITMAPFILEHEADER bfh; G>&=rmK"  
 bfh.bfReserved1=bfh.bfReserved2=0; *W,"UL6U8y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); :U)q(.53  
 bfh.bfSize=54+size; :j9{n ,F  
 bfh.bfOffBits=54; s;X"E =  
 CFile bf; _KC)f'Cx  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Jf@M>BT^A  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); br+{23&1R#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Q+)fI  
  bf.WriteHuge(lpData,size); "DM $FRI0  
  bf.Close(); Kvv&# eO\  
  nCount++; MBRRzq%F  
 } sXOGIv  
 GlobalFreePtr(lpData); /4+M0Pl  
 if(nCount==1) 1w'iD X  
  m_Number.Format("%d picture captured.",nCount); ~PP*k QZlJ  
 else S{{D G  
  m_Number.Format("%d pictures captured.",nCount); [>::@[  
  UpdateData(FALSE); :.f =>s]  
} +r *f2\S  
RS!~5nk5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) y562g`"U  
{ =K .'x  
 if(pMsg -> message == WM_KEYDOWN) "AP'' XNi  
 { w' K\}G~  
  if(pMsg -> wParam == VK_ESCAPE) QgO@oV*S  
   return TRUE; E8J `7sa  
  if(pMsg -> wParam == VK_RETURN) n^'ip{  
   return TRUE; yd[}?  
 } ."l@aE=|  
 return CDialog::PreTranslateMessage(pMsg); }"wWSPD  
} z"bgtlfb8  
%50}oD@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J!O5`k*.C  
{ 55MsF}p  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ PF*<_p"j  
  SaveBmp(); >|WNsjkU%  
  return FALSE; BRYhL|d~.  
} 'x{g P?.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ R8P7JY[h  
 CMenu pop; CdlE"Ye  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Q ,30  
 CMenu*pMenu=pop.GetSubMenu(0); |`_qmk[:R  
 pMenu->SetDefaultItem(ID_EXITICON); HGfV2FtTz  
 CPoint pt; zm) ]cq  
 GetCursorPos(&pt); KhAj`vOzK  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c-3AzB#[  
 if(id==ID_EXITICON) =z'- B~  
  DeleteIcon(); ^;@q^b)ZP  
 else if(id==ID_EXIT)  XWV)   
  OnCancel(); UhYeyT  
 return FALSE; *Uie{^p?  
} $cEl6(66iX  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); a'U7 t  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0?  (  
 AddIcon(); no`c[XY  
 return res; 3P~I' FQ  
} ne] |\]  
35B G&;C  
void CCaptureDlg::AddIcon() ewg&DBbN"  
{ iM+K&\{_h  
 NOTIFYICONDATA data; Kj,C 9  
 data.cbSize=sizeof(NOTIFYICONDATA); S.rlF1`  
 CString tip; u"XqWLTV  
 tip.LoadString(IDS_ICONTIP); 0"7 xCx  
 data.hIcon=GetIcon(0); MO&QR-OY  
 data.hWnd=GetSafeHwnd(); ]J+ }WR  
 strcpy(data.szTip,tip); *`OgwMr)M  
 data.uCallbackMessage=IDM_SHELL; 6Ae<W7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5A/8G}'XZ  
 data.uID=98; m6tbN/EJZ  
 Shell_NotifyIcon(NIM_ADD,&data); ] C_g: |q  
 ShowWindow(SW_HIDE); ?9xaBWf  
 bTray=TRUE; SO%x=W  
} ,}2yxo;i  
aKXaor@0f.  
void CCaptureDlg::DeleteIcon() A]" $O&l  
{ 8aZuI|z  
 NOTIFYICONDATA data; O^ZOc0<  
 data.cbSize=sizeof(NOTIFYICONDATA); _Qg^>}]A1  
 data.hWnd=GetSafeHwnd(); c9imfA+e  
 data.uID=98;  /B)ZB})z  
 Shell_NotifyIcon(NIM_DELETE,&data); bg;N BoZd  
 ShowWindow(SW_SHOW); rU<NHFGj4  
 SetForegroundWindow(); _yY(&(]#  
 ShowWindow(SW_SHOWNORMAL); =xcA4"k  
 bTray=FALSE; qYv/" 1  
} uqwB`<>KJ  
ufAp 7m@ud  
void CCaptureDlg::OnChange() 48dIh\TH"  
{ Fq/?0B8  
 RegisterHotkey(); LW6&^S?4{  
} yL/EIN  
@Aa$k:_  
BOOL CCaptureDlg::RegisterHotkey() g.OBh_j-v  
{ b:3n)-V{u  
 UpdateData(); Xr\|U89P  
 UCHAR mask=0; %"^$$$6%  
 UCHAR key=0; W$LaXytmak  
 if(m_bControl) 6Ug( J$Ouh  
  mask|=4; 1];rW`Bw  
 if(m_bAlt) x)0g31 4 9  
  mask|=2; hNBv|&D#  
 if(m_bShift) .|Y2'TWQ  
  mask|=1; Nf8."EDUW  
  key=Key_Table[m_Key.GetCurSel()]; wP28IB:^  
 if(bRegistered){ /.<%y 8v  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 'teToE<i  
  bRegistered=FALSE; ^|y6oj  
 } wy6>^_z  
 cMask=mask; ,9<}V;(  
 cKey=key; S|!)_RL  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); m^cr-'  
 return bRegistered; yoa"21E$  
} jn vJ`7zFP  
[uK*=K/v  
  四、小结 'Lu7cb^  
-=BQVJ_dK{  
  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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