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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: FcDS*ZEk!  
  Z~5) )5Ye;  
  一、实现方法 YDt+1Kw}D  
y>^a~}Zq  
  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: V>Wk\'h  
\/a6h   
#pragma data_seg("shareddata") Gz[yD ~6a  
HHOOK hHook =NULL; //钩子句柄 aB9!}3@  
UINT nHookCount =0; //挂接的程序数目 #+ I'V\ [  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 D Ez,u^   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 25^?|9o7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey RZ".?  
static int KeyCount =0; zZ5:)YiW-  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 4fEDg{T  
#pragma data_seg() }cKB)N BJb  
\o9 \i kR  
  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。 JAPr[O&  
_VtQMg|u  
  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: k+3qX'fd  
8%?y)K^ D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR dUI5,3*  
cKey,UCHAR cMask) 'D\Q$q  
{ I=Y>z ^4  
 BOOL bAdded=FALSE; (i1JRn-f  
 for(int index=0;index<MAX_KEY;index++){ vvoxK0  
  if(hCallWnd[index]==0){ jlEz]@ i  
   hCallWnd[index]=hWnd; :+rGBkw1m  
   HotKey[index]=cKey; 7s9h:/Lu  
   HotKeyMask[index]=cMask; wj|Zn+{"nF  
   bAdded=TRUE; ?pDr"XH~  
   KeyCount++; PnlI {d  
   break; 1>!LK_  
  } gq?:n.;TY  
 } 8[^'PIz  
 return bAdded; QTV*m>D  
} y8Va>ul"U  
//删除热键 x0*{oP  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mkl{Tp*  
{ ,$P,x  
 BOOL bRemoved=FALSE; yU?jmJ  
 for(int index=0;index<MAX_KEY;index++){ ; * [:~5Wc  
  if(hCallWnd[index]==hWnd){ r~w.J+W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 39pG-otJ  
    hCallWnd[index]=NULL; L * n K> +  
    HotKey[index]=0; \bA Yic  
    HotKeyMask[index]=0; Z:; }  
    bRemoved=TRUE; U)S=JT~h  
    KeyCount--; .R9Z$Kbq  
    break; e|~MJu+1  
   } ]S|FK>U[  
  } niVR!l  
 } DL]tg [w{  
 return bRemoved; vW63j't_  
} {h<D/:^v  
r-2k<#^r  
bp1AN9~  
  DLL中的钩子函数如下: l6viP}R  
8xpplo8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xNP_>Qa~  
{ "tK%]c d-  
 BOOL bProcessed=FALSE; :FyF:=  
 if(HC_ACTION==nCode) 9 _d2u#  
 { }x8!{Y#cF  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *Ak.KBg  
   switch(wParam) f0<zK !  
   {   ao(T81  
    case VK_MENU: ~MpikBf  
     MaskBits&=~ALTBIT; D$>_W,*V  
     break; ,pNx(a  
    case VK_CONTROL: N^^0j,  
     MaskBits&=~CTRLBIT; :5d>^6eoB?  
     break; S{Y zHK  
    case VK_SHIFT: 2[E wN!IZ  
     MaskBits&=~SHIFTBIT; <v"o+  
     break; 8;PkuJR_]  
    default: //judge the key and send message yNTd_XPL  
     break; U=>S|>daR  
   } /--p#Gh'  
   for(int index=0;index<MAX_KEY;index++){ %H{p&ms  
    if(hCallWnd[index]==NULL) b7Y g~Lw  
     continue; V\V /2u5-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >r.]a`  
    { YJi%vQ*]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Q YJ EUC@  
     bProcessed=TRUE; cHFi(K]|1  
    } =x~I'|%3  
   } x2"iZzQlD  
  } LQ0/oYmNc  
  else if((lParam&0xc000ffff)==1){ //有键按下 f| RmAP;X,  
   switch(wParam) *Cy54Z#  
   { \l+v,ELX=  
    case VK_MENU: _03?XUKV  
     MaskBits|=ALTBIT; Fu7:4+  
     break; x)5}:b1B=  
    case VK_CONTROL: 5*0zI\  
     MaskBits|=CTRLBIT; jX53 owZ  
     break; &H(yLd[  
    case VK_SHIFT: I[z:;4W}L^  
     MaskBits|=SHIFTBIT; A_9WSXR  
     break; f~IJ4T2#N  
    default: //judge the key and send message !(s n9z#  
     break; e3~MU6  
   } -@TY8#O#-  
   for(int index=0;index<MAX_KEY;index++){ Sn CwoxK  
    if(hCallWnd[index]==NULL) : =QX^*  
     continue; qY_qS=H^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yzK;  
    { ~^t@TMk$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H DVimoOq  
     bProcessed=TRUE; {@Wv@H+4  
    } ?vXgHDs^T  
   } 5=>1>HYM  
  } Lx"GBEkt7  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 WhPP4 #  
   for(int index=0;index<MAX_KEY;index++){ `y8pwWo-o  
    if(hCallWnd[index]==NULL) _\!]MV  
     continue; \j8vf0c5b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A^U84kV=  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); OV>& `puL  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^@fD{]I  
   } ,0l Od<  
  } H R>Y?B{  
 } p8Vqy-:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); OvfluFu7  
} F!z0N&#  
.ZXoRT  
  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: f}otIf  
a[{$4JpK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3i^X9[.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F%>$WN#2  
 C=D*  
  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: w,{h9f  
6j E.X  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &OR(]Wt0  
{ ;$p!dI\-Q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) IUMv{2C  
 { xJq|,":gj  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 q8 v iC|  
  SaveBmp(); rxCzPF  
  return FALSE; N:j 7J  
 } :;?$5h*|`  
 …… //其它处理及默认处理 2a d|v]  
} ">V&{a-C4  
(* -wiL  
/ViY:-8s  
  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。 J,W<ha*  
72HA.!ry  
  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。 D%SOX N  
XM'tIE+|  
  二、编程步骤 w[~G^x&  
m^X51,+<  
  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"; I{Du/"r#  
n,I3\l9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; .Rr^AGA4  
%9-^,og  
  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; D(b01EQ;d  
r. 82RoG?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; E@}F^0c  
KsDS!O  
  5、 添加代码,编译运行程序。 U}92%W?  
hBgE%#`s  
三、程序代码 g 9,"u_  
F^,:p.ihm<  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $]7f1U_e  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Mj0 ,Y#=76  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ZmK=8iN9J  
#if _MSC_VER > 1000 tE*BZXBlm  
#pragma once ||+~8z#+,  
#endif // _MSC_VER > 1000 2mLZ4 r>WE  
#ifndef __AFXWIN_H__ @K;b7@4y  
#error include 'stdafx.h' before including this file for PCH y r (g/0  
#endif y oW ~  
#include "resource.h" // main symbols .?}M(mL  
class CHookApp : public CWinApp c *KE3:  
{ ~IhAO}1  
 public: 9a`Lr B  
  CHookApp(); $8^Hk xy  
  // Overrides /wD f,Hduz  
  // ClassWizard generated virtual function overrides bY_'B5$.^2  
  //{{AFX_VIRTUAL(CHookApp) C'R9Nn'  
 public: N0 {e7M  
  virtual BOOL InitInstance(); *'@O o  
  virtual int ExitInstance(); *85N_+Wv!  
  //}}AFX_VIRTUAL hSehJjEoM  
  //{{AFX_MSG(CHookApp) :{u`qi  
  // NOTE - the ClassWizard will add and remove member functions here. |q`NJ  
  // DO NOT EDIT what you see in these blocks of generated code ! VL%. maj  
  //}}AFX_MSG WJ{Iv] }9  
  DECLARE_MESSAGE_MAP() 7_~ A*LM  
}; =D<0&M9C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]545:)Q1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (\\;A?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D4%J!L<P  
BOOL InitHotkey(); j>8DaEfwx  
BOOL UnInit(); ;|Cd q  
#endif s5~k]"{j  
c 4z&HQd  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. %H{pU:[5*  
#include "stdafx.h" aZ@pfWwa:  
#include "hook.h" Pps$=`  
#include <windowsx.h> Q2 q~m8(  
#ifdef _DEBUG j6%W+;{/pj  
#define new DEBUG_NEW XgxE M1(  
#undef THIS_FILE 2w|5SK_  
static char THIS_FILE[] = __FILE__; n%E,[JT  
#endif /HIyQW\Ki-  
#define MAX_KEY 100 %.Y5%T yP  
#define CTRLBIT 0x04 [@@{z9c  
#define ALTBIT 0x02 U4XW Kwq  
#define SHIFTBIT 0x01 EP:`l  
#pragma data_seg("shareddata") Po?MTA  
HHOOK hHook =NULL; N+&uR!:.C  
UINT nHookCount =0; n;Bb/Z!~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey tN#C.M7.'7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT C?qRZB+W#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /@:X0}L  
static int KeyCount =0; >n7h%c  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0C zQel)L:  
#pragma data_seg() TdFU,  
HINSTANCE hins; I Q_6DF  
void VerifyWindow(); ; Y/nS  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) j!+jLm!l  
//{{AFX_MSG_MAP(CHookApp) %q5dV<X'c  
// NOTE - the ClassWizard will add and remove mapping macros here. Q4XlYgIV2A  
// DO NOT EDIT what you see in these blocks of generated code! oh5'Isb$  
//}}AFX_MSG_MAP sL@\,]Y  
END_MESSAGE_MAP() SZGR9/* ^  
BX_yC=S  
CHookApp::CHookApp() Pe`mZCd^  
{ s;A7:_z#7  
 // TODO: add construction code here, a1pp=3Pd?~  
 // Place all significant initialization in InitInstance @i ~A7L0/  
} +4yre^gC  
`v -[&  
CHookApp theApp; ~'M<S=W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 21TR_0g&<  
{ u X,n[u  
 BOOL bProcessed=FALSE; L{/% "2>  
 if(HC_ACTION==nCode) LR=Ji7  
 { $RDlM  
  if((lParam&0xc0000000)==0xc0000000){// Key up  IuY9Q8  
   switch(wParam) |WB-Ng  
   { ixA.b#!1  
    case VK_MENU: kk fWiPO^  
     MaskBits&=~ALTBIT; 'T eH(?3G  
     break; n/ KO{:  
    case VK_CONTROL: (d4btcg  
     MaskBits&=~CTRLBIT; Kx9u|fp5  
     break; E2DfG^sGV  
    case VK_SHIFT: YR'F]FI  
     MaskBits&=~SHIFTBIT; l'I:0a 4T  
     break; )<5k+O~  
    default: //judge the key and send message (dlp5:lQz  
     break; 88HqP!m%P:  
   } <::lfPP  
   for(int index=0;index<MAX_KEY;index++){ >/ay'EyY;>  
    if(hCallWnd[index]==NULL) Zn9tG:V  
     continue; @gN"Q\;F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O2fq9%lk  
    { .wNXvnWr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R-%6v2;ry  
     bProcessed=TRUE; $0$sM/%  
    } NP;W=A F  
   } 0AHQ(+Ap  
  } tV !?Ol  
  else if((lParam&0xc000ffff)==1){ //Key down }y6)d.  
   switch(wParam) @43psq1  
   { <,CrE5Pl  
    case VK_MENU: U:8[%a  
     MaskBits|=ALTBIT; t7byOMC  
     break; "$(+M t^  
    case VK_CONTROL: T'pL&@,Q  
     MaskBits|=CTRLBIT; JuO47}i]5  
     break; ~,/@]6S&Y  
    case VK_SHIFT: ?t YZ/  
     MaskBits|=SHIFTBIT; <Y k i8  
     break; 4Ly>x>b<  
    default: //judge the key and send message vAX(3  
     break; uZ6krI  
   } ;<Q%d~$xy}  
   for(int index=0;index<MAX_KEY;index++) 4&W?: =H2  
   { mB-,\{)  
    if(hCallWnd[index]==NULL) 'xH^ksb"  
     continue; m* m),mZ"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -,bnj^L  
    { zT>!xGTu7~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); * zp tbZ  
     bProcessed=TRUE; d-b04Q7DQ  
    } 6x^$W ]R  
   } =TD`Pet  
  } Z:9Q~}x8  
  if(!bProcessed){ {R_>KE1  
   for(int index=0;index<MAX_KEY;index++){ TAXsL&Tz>  
    if(hCallWnd[index]==NULL) m,)s8_a  
     continue; [v~,|N>w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) coAXYn  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Uxjc&o  
   } -leX|U}k  
  } Q]9$dr=Kk0  
 } r *K  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ! JA;0[;l=  
} FMdu30JV  
! AwMD  
BOOL InitHotkey() uG\~Hxqw7O  
{ *I 1H  
 if(hHook!=NULL){ u ON(LavB  
  nHookCount++; VKttJok1  
  return TRUE; m?(8T|i  
 } [rx9gOOa&  
 else f=^xU P  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &Ym):pc  
  if(hHook!=NULL) m|q,i xg  
   nHookCount++; (~DW_+?]'  
  return (hHook!=NULL); 9w-\K]  
} *s4|'KS2o  
BOOL UnInit() [Vs\r&qL  
{ W{;Qi&^ca  
 if(nHookCount>1){ (p2`ofj  
  nHookCount--; :u4|6?  
  return TRUE; AA5G` LiT  
 } Um+_ S@h  
 BOOL unhooked = UnhookWindowsHookEx(hHook); h  /  
 if(unhooked==TRUE){ LSta]81B4L  
  nHookCount=0; $!O@Z8B  
  hHook=NULL; ?I?G+(bq  
 } pX%:XpC!h  
 return unhooked; n%3!)/$  
} V&f*+!!2  
C&z!="hMhR  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "L2*RX.R  
{ jZ.yt+9  
 BOOL bAdded=FALSE; _^FC 9  
 for(int index=0;index<MAX_KEY;index++){ 0%bCP/  
  if(hCallWnd[index]==0){ NQqw|3  
   hCallWnd[index]=hWnd; )M0`dy{1  
   HotKey[index]=cKey; n=!T (Hk  
   HotKeyMask[index]=cMask; 4K^cj2 X  
   bAdded=TRUE; FQ>$Ps*a[  
   KeyCount++; ]ogifnwv  
   break; $5pCfW8>  
  } ehW[LRtq  
 } qcs) p  
 return bAdded; #}#m\=0  
} ndD>Oc}"3  
|jIHgm  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /MtmO$ .  
{ [~N;d9H+*1  
 BOOL bRemoved=FALSE; =RWTjTZ   
 for(int index=0;index<MAX_KEY;index++){ btg= # u  
  if(hCallWnd[index]==hWnd){ b d 1^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ r6F TpOF  
    hCallWnd[index]=NULL; llZU: bs  
    HotKey[index]=0; {($bz T7c  
    HotKeyMask[index]=0; {L;sF=d  
    bRemoved=TRUE; ]+:yfDtZd  
    KeyCount--; 4.,EKw3  
    break; :-{"9cgF R  
   } Zbnxs.i!  
  } 9p8ajlYg,  
 } ^8&}Nk[j  
 return bRemoved; P8m0]T.&x  
} e=9/3?El  
i\CA6I  
void VerifyWindow() oB 1Qw'J w  
{ w>2lG3H<  
 for(int i=0;i<MAX_KEY;i++){ S #GxKMO%  
  if(hCallWnd!=NULL){ !l*A3qA  
   if(!IsWindow(hCallWnd)){ ,g?ny<#o  
    hCallWnd=NULL; c';~bYZ  
    HotKey=0; Fu.aV876\f  
    HotKeyMask=0; jgE{JK\n4  
    KeyCount--; "]"0d[d  
   } W|2^yO,dX  
  } VV Q~;{L  
 } Q+1ot,R  
} 8fqabR  
wKpGJ& {  
BOOL CHookApp::InitInstance() {v*4mT  
{ |V5BL<4  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); K#A&  
 hins=AfxGetInstanceHandle(); <4TI;yy6?  
 InitHotkey(); QjLU@?&  
 return CWinApp::InitInstance(); Z0&^(Fb  
} l-w4E"n3  
3}}/,pGSc  
int CHookApp::ExitInstance() tEL;,1  
{ L<V20d9  
 VerifyWindow(); b=Nsz$[  
 UnInit(); D#<y pJR  
 return CWinApp::ExitInstance(); L9/'zhiZBx  
} $2Wk#F2c=  
=\]gL%N-|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file bZ_&AfcB  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) vGyQ306  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4>(K~v5;N  
#if _MSC_VER > 1000 Mg\588cI  
#pragma once #m|el@)  
#endif // _MSC_VER > 1000 Z kw-a  
c&T5C, ]  
class CCaptureDlg : public CDialog I0Do%  
{ 0c>>:w20D  
 // Construction Sp[9vlo8  
 public: rv[BL.qV  
  BOOL bTray; VQ!4( <XD  
  BOOL bRegistered; 9]3l'  
  BOOL RegisterHotkey(); |!K&h(J|  
  UCHAR cKey; |6NvByc,  
  UCHAR cMask; :vi %7  
  void DeleteIcon(); >> cW0I/`  
  void AddIcon(); ?4SYroXUX|  
  UINT nCount; q[/g3D\G  
  void SaveBmp(); c+{XP&g8_J  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6No.2Oo  
  // Dialog Data DQhHU1  
  //{{AFX_DATA(CCaptureDlg) ,;6%s>Cvd(  
  enum { IDD = IDD_CAPTURE_DIALOG }; I&|8 qx#  
  CComboBox m_Key; 7eq.UyUxs  
  BOOL m_bControl; 3wN4kltt  
  BOOL m_bAlt; "a(R>PV%  
  BOOL m_bShift; ^Whc<>|  
  CString m_Path; K/(LF}  
  CString m_Number; 1%M^MT%&  
  //}}AFX_DATA T\wOGaCW  
  // ClassWizard generated virtual function overrides x75;-q  
  //{{AFX_VIRTUAL(CCaptureDlg) 3=]/+{B  
 public: 3Dc^lfn  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  ~@@t-QY  
 protected: Q \X_JZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support f~d =1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); b c .Vy  
  //}}AFX_VIRTUAL CWs;1`aP  
  // Implementation *RkvM?o@jC  
 protected: ~=wBF  
  HICON m_hIcon; ,hK =x  
  // Generated message map functions b<fN,U< k  
  //{{AFX_MSG(CCaptureDlg) 9F,XjPK=  
  virtual BOOL OnInitDialog(); yMNOjs'c {  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,,XHw;{  
  afx_msg void OnPaint(); w;VUP@Wm  
  afx_msg HCURSOR OnQueryDragIcon(); m";8 nm  
  virtual void OnCancel(); ~l+~MB  
  afx_msg void OnAbout(); ZbH6$2r  
  afx_msg void OnBrowse(); D622:Y886  
  afx_msg void OnChange(); Zo-Au  
 //}}AFX_MSG zh !/24p9  
 DECLARE_MESSAGE_MAP() d{!zJ+n  
}; -GgV&%'a  
#endif " 6$+B/5  
=L$RY2S"  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^<yM0'0t  
#include "stdafx.h" XSZjuQ<[3  
#include "Capture.h" :\#]uDT2=  
#include "CaptureDlg.h" xT9+l1_  
#include <windowsx.h> [t^%d9@t  
#pragma comment(lib,"hook.lib") kGq<Zmy|  
#ifdef _DEBUG VAxk?P0j6  
#define new DEBUG_NEW I |D]NY^  
#undef THIS_FILE a(o[ bH.|;  
static char THIS_FILE[] = __FILE__; iEFS>kL8e  
#endif $AFiPH9  
#define IDM_SHELL WM_USER+1 e ]>{?Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8/34{2048  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nDC5/xB  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Sdmynuv U  
class CAboutDlg : public CDialog S4O:?^28  
{ D/{Spw@  
 public: _ )^n[_E  
  CAboutDlg(); Qzk/oH s  
  // Dialog Data a7NX~9 g  
  //{{AFX_DATA(CAboutDlg) K3UG6S\B  
  enum { IDD = IDD_ABOUTBOX }; _Q;M$.[zyR  
  //}}AFX_DATA CQY/q@7  
  // ClassWizard generated virtual function overrides a-TsD}'X  
  //{{AFX_VIRTUAL(CAboutDlg) = &aD!nTx  
 protected: .+AO3~Dg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ldoN!J  
  //}}AFX_VIRTUAL `V ++})5v  
  // Implementation q14A 'XW  
 protected: UE\@7  
  //{{AFX_MSG(CAboutDlg) w_J`29uc  
  //}}AFX_MSG >BQF<  
  DECLARE_MESSAGE_MAP() 4sK|l|W  
}; [dL?N  
-p !KsU  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .J\U|r  
{ >-y&k^a=  
 //{{AFX_DATA_INIT(CAboutDlg) <Q-ufF85)  
 //}}AFX_DATA_INIT zT+yZA.L  
} cfe[6N  
8CSvg{B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !c`Q?aGV)  
{ 0\}j[-`pF  
 CDialog::DoDataExchange(pDX); {K0T%.G  
 //{{AFX_DATA_MAP(CAboutDlg) uJp}9B60_  
 //}}AFX_DATA_MAP )@`w^\E_~_  
} Q+ST8  
KF-gcRh  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) XY QUU0R  
 //{{AFX_MSG_MAP(CAboutDlg) .}y Lz  
 // No message handlers #WpO9[b>  
 //}}AFX_MSG_MAP A8eli=W  
END_MESSAGE_MAP() SS~Txt75m  
yxQAO_C  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \&qVr1|  
: CDialog(CCaptureDlg::IDD, pParent) )J88gMk+  
{ RBgkC+2  
 //{{AFX_DATA_INIT(CCaptureDlg) izW l5}+'B  
  m_bControl = FALSE; $kz5)vj "  
  m_bAlt = FALSE; ~O 6~',KD  
  m_bShift = FALSE; K6oX nz}  
  m_Path = _T("c:\\"); @x J^JcE  
  m_Number = _T("0 picture captured."); }>XSp)"{l  
  nCount=0; (&hX8  
  bRegistered=FALSE; qK1V!a2  
  bTray=FALSE; ze\~-0ks +  
 //}}AFX_DATA_INIT IKr7"`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gS|xicq!  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }EIwkz8  
} )L hO}zQ  
rqh,BkQ0t  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) QBn>@jq  
{ &{=~)>h  
 CDialog::DoDataExchange(pDX); a!^wc,  
 //{{AFX_DATA_MAP(CCaptureDlg) A07 P$3>/W  
  DDX_Control(pDX, IDC_KEY, m_Key); +@qk=]3a  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~D=@4(f8|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); dO//  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); yEqmB4^-  
  DDX_Text(pDX, IDC_PATH, m_Path); \+~4t  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 7Y*m_AhxJ  
 //}}AFX_DATA_MAP i:8^:(i  
} I~qiF%?d  
4K;j:ZJ"x  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ry]7$MQyV  
//{{AFX_MSG_MAP(CCaptureDlg) l{a&Zy)  
 ON_WM_SYSCOMMAND() ;VFr5.*x  
 ON_WM_PAINT() lqCn5|S]  
 ON_WM_QUERYDRAGICON() "=n8PNV/ c  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ;Gs**BB&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) E6@ ;e-]j  
 ON_BN_CLICKED(ID_CHANGE, OnChange) {n{}Y.  
//}}AFX_MSG_MAP dGteYt_F  
END_MESSAGE_MAP() ?(<AT]hV:  
pOYtN1uN|  
BOOL CCaptureDlg::OnInitDialog() 7h0'R k  
{ BD0-v`  
 CDialog::OnInitDialog(); fDqXM;a"  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2,;t%GB  
 ASSERT(IDM_ABOUTBOX < 0xF000); !Cy2>6v7  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *pD;AU  
 if (pSysMenu != NULL) r"[T9  
 { nm-Y?!J  
  CString strAboutMenu; |YFD|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 9|WWA%p  
  if (!strAboutMenu.IsEmpty()) ` ;=Se_  
  { #"{8Z&Z  
   pSysMenu->AppendMenu(MF_SEPARATOR); oX4uRc7wR  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); GKtQ>39B  
  } 5#o,]tP  
 } h^*{chm]  
 SetIcon(m_hIcon, TRUE); // Set big icon <"+C<[n.  
 SetIcon(m_hIcon, FALSE); // Set small icon 8)!;[G|  
 m_Key.SetCurSel(0); ,7g;r_qwA  
 RegisterHotkey(); m8PB2h  
 CMenu* pMenu=GetSystemMenu(FALSE); *n'x S L  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ma daxx  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ksaC[G;}:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); A,e^bM  
 return TRUE; // return TRUE unless you set the focus to a control rw2|1_AF  
} DS2$w9!  
z.^ )r  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) k-e@G'  
{ ~QcKW<bz  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ):@%xoF5  
 { :GYv9OG  
  CAboutDlg dlgAbout; `7_LJ \>I  
  dlgAbout.DoModal(); ~&:R\  
 } ECzNByP  
 else vrv*k  
 { /,UkT*+>!  
  CDialog::OnSysCommand(nID, lParam); B ,Brmn  
 } ? $ c  
} @GtZK  
(d#Z-w-  
void CCaptureDlg::OnPaint() SXz([Z{)  
{ \pGO}{3 e*  
 if (IsIconic()) Z5[:Zf?h7J  
 { ;/T-rVND  
  CPaintDC dc(this); // device context for painting ,-Nk-g  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); AyO|9!F@A  
  // Center icon in client rectangle _[o^23Hj  
  int cxIcon = GetSystemMetrics(SM_CXICON); " G6j UTt  
  int cyIcon = GetSystemMetrics(SM_CYICON); 8w[EyVHA  
  CRect rect; 9Ol_z\5  
  GetClientRect(&rect); 3= zQ U  
  int x = (rect.Width() - cxIcon + 1) / 2; *KH@u  
  int y = (rect.Height() - cyIcon + 1) / 2; eBIR *TZ):  
  // Draw the icon  Vb 9N~v  
  dc.DrawIcon(x, y, m_hIcon); RA I&;"  
 } :Qo  
 else I7^X;Q F  
 { k& s7 -yY  
  CDialog::OnPaint(); Fd&!-` T?  
 } J6ShIPc  
} A_~5|  
MjC%6%HI  
HCURSOR CCaptureDlg::OnQueryDragIcon() %:?QE ;  
{ xN8JrZE&  
 return (HCURSOR) m_hIcon; p\;)^O4  
} ~J{[]wi  
WUS9zK  
void CCaptureDlg::OnCancel() f;H#TSJ  
{ oD@jtd>b%  
 if(bTray) rI+w1';C1  
  DeleteIcon(); c|( ?  
  CDialog::OnCancel(); ~9{;V KgK  
} >1G*ya)  
(x0*(*A}  
void CCaptureDlg::OnAbout() lkg*AAR?'  
{ ,D2_Z]  
 CAboutDlg dlg; gCr|e}w-  
 dlg.DoModal(); s[@>uP  
} zf>^2t*\  
xevP2pYG:  
void CCaptureDlg::OnBrowse() |;m`874  
{ 0DVZRB  
 CString str; \nAHpF  
 BROWSEINFO bi; 2 U`W[  
 char name[MAX_PATH]; _JTxm>  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); uo'31V0  
 bi.hwndOwner=GetSafeHwnd(); )NmlV99q  
 bi.pszDisplayName=name; Wo+CQH6(  
 bi.lpszTitle="Select folder"; S/<"RfVU#o  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; QsJW"4d  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0&IXzEOr  
 if(idl==NULL) G? gXK W  
  return; cgxF Ev  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )(Mr f{  
 str.ReleaseBuffer(); !aw#',r8m  
 m_Path=str; I#E(r>KW*  
 if(str.GetAt(str.GetLength()-1)!='\\') Vy^yV|`v  
  m_Path+="\\"; ! M&un*  
 UpdateData(FALSE); Wo9psv7.  
} Tb1}XvZ  
:@%-f:iDj  
void CCaptureDlg::SaveBmp() L@n6N|[_  
{ h<' 5q&y  
 CDC dc; 1~5q:X  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); j-`X_8W  
 CBitmap bm; ~J>gVg%66  
 int Width=GetSystemMetrics(SM_CXSCREEN); =Cy>$/H64  
 int Height=GetSystemMetrics(SM_CYSCREEN); sC5uA .?>9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 4!~ .6cp3  
 CDC tdc; Qj<{oZp&  
 tdc.CreateCompatibleDC(&dc); H]$=*(aje  
 CBitmap*pOld=tdc.SelectObject(&bm);  +iH30v  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); yaRcBT?  
 tdc.SelectObject(pOld); C nSX  
 BITMAP btm; Xvj=*wg\Y  
 bm.GetBitmap(&btm); PL9eUy  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; YP#AB]2\}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); O(D5A?tv!  
 BITMAPINFOHEADER bih; (ND5CKCR^  
 bih.biBitCount=btm.bmBitsPixel; r3H}*Wpf  
 bih.biClrImportant=0; ^/C $L8#  
 bih.biClrUsed=0; {#1j"  
 bih.biCompression=0; 2'<=H76  
 bih.biHeight=btm.bmHeight; H/Ec^Lc+_  
 bih.biPlanes=1; 33<fN:J]f  
 bih.biSize=sizeof(BITMAPINFOHEADER); `!omzE*bk5  
 bih.biSizeImage=size; Xm8Z+}i  
 bih.biWidth=btm.bmWidth; I51oG:6fR?  
 bih.biXPelsPerMeter=0; C?60`^  
 bih.biYPelsPerMeter=0; +eBMn(7Cgv  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); A!ioji+{[  
 static int filecount=0; v=*Bb3dt  
 CString name; 5&<d2EG6l'  
 name.Format("pict%04d.bmp",filecount++); k)5_1y  
 name=m_Path+name; _iGU|$a  
 BITMAPFILEHEADER bfh; iL0jpa<}  
 bfh.bfReserved1=bfh.bfReserved2=0; ! nCjA\$  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 7O+Ij9+{n  
 bfh.bfSize=54+size; 2&gd"Ak(  
 bfh.bfOffBits=54; F8[B^alAe  
 CFile bf; p`ADro*  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 'z-;*!A}j  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); L`jB)wF /J  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ," C[Qg(  
  bf.WriteHuge(lpData,size); y^ X\^Kq  
  bf.Close(); XJmFJafQD  
  nCount++; &gA6+b'  
 } 4FIV  
 GlobalFreePtr(lpData); 3"'# |6O9  
 if(nCount==1) Jm %ynW  
  m_Number.Format("%d picture captured.",nCount); \m=-8KpU  
 else i5 L:L  
  m_Number.Format("%d pictures captured.",nCount); <o&o=Y8  
  UpdateData(FALSE); DIG0:)4R.  
} 5@ bc(H  
$bZu^d,  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &\1'1`N1  
{ egI{!bZg'\  
 if(pMsg -> message == WM_KEYDOWN) ,pyQP^u-  
 { QGH h;  
  if(pMsg -> wParam == VK_ESCAPE) Jt2,LL:G  
   return TRUE; /lLov.  
  if(pMsg -> wParam == VK_RETURN) Vl{~@G,@  
   return TRUE; w.J%qWJq  
 } GSz @rDGY  
 return CDialog::PreTranslateMessage(pMsg); k-WHHoU>o  
} *?_qE  
`E} p77  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <$jKy3@  
{ w0Fwd  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Yzj%{fkh  
  SaveBmp(); &GdL 9!hH  
  return FALSE; r]k*7PK  
} Kajkw>z  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y)3~]h\a  
 CMenu pop; p!+L  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); aGPqh,<QD  
 CMenu*pMenu=pop.GetSubMenu(0); ow2M,KU6Z  
 pMenu->SetDefaultItem(ID_EXITICON); [O^}rUqq  
 CPoint pt; <1aa~duT  
 GetCursorPos(&pt); [O=W>l  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); hzaLx8L  
 if(id==ID_EXITICON) :3*`IB !  
  DeleteIcon(); \Y*!f|=of  
 else if(id==ID_EXIT) W`#gpi)7N  
  OnCancel(); A)8rk_92Q  
 return FALSE; qE>i,|rP`  
} jEUx q%BH  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); H}vn$$ O  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) VR "u*  
 AddIcon(); <O;&qT*b  
 return res; }dy9I H  
} A?e,U,  
5B%w]n  
void CCaptureDlg::AddIcon() GGCqtA^@7d  
{ Js/N()X  
 NOTIFYICONDATA data; FyCBN tCv  
 data.cbSize=sizeof(NOTIFYICONDATA); e\`wlaP,  
 CString tip; 49o\^<4b  
 tip.LoadString(IDS_ICONTIP); XmP;L(wa   
 data.hIcon=GetIcon(0); avlqDi1l  
 data.hWnd=GetSafeHwnd(); x'@W=P 7   
 strcpy(data.szTip,tip); R;WW f.#  
 data.uCallbackMessage=IDM_SHELL; Q-[3j  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; LyIKP$t  
 data.uID=98; -:MmSeG7gO  
 Shell_NotifyIcon(NIM_ADD,&data); $u:<x  
 ShowWindow(SW_HIDE); $nj\\,(g  
 bTray=TRUE; !6lOIgn  
} ^D>fis  
]*0(-@  
void CCaptureDlg::DeleteIcon() '}_=kp'X  
{ )&>L !,z  
 NOTIFYICONDATA data;  q$F)!&  
 data.cbSize=sizeof(NOTIFYICONDATA); }@wVW))6$  
 data.hWnd=GetSafeHwnd(); #+$ zE#je  
 data.uID=98; k=e`*LB\  
 Shell_NotifyIcon(NIM_DELETE,&data); mKM,kY  
 ShowWindow(SW_SHOW); *m*`}9  
 SetForegroundWindow(); Wu,S\!  
 ShowWindow(SW_SHOWNORMAL); YNI;h%w  
 bTray=FALSE; yx2z%E  
} YV-j/U{&  
1DUb [W8  
void CCaptureDlg::OnChange() q]K'p,'  
{ ] @ufV  
 RegisterHotkey(); B;V5x/  
} ~Po<(A}`f  
\Dfm(R  
BOOL CCaptureDlg::RegisterHotkey() cM3jnim  
{ 0*/kGvw`i  
 UpdateData(); +,z) #  
 UCHAR mask=0; *#zS^b n  
 UCHAR key=0; m~;B:LN<  
 if(m_bControl) CI^[I\$&  
  mask|=4; u\f3qc,]F  
 if(m_bAlt) B_hPcmB  
  mask|=2; mg`j[<wp  
 if(m_bShift) tU{\ev$x  
  mask|=1; L"^OdpOs  
  key=Key_Table[m_Key.GetCurSel()]; k=`$6(>Fz  
 if(bRegistered){ "CBRPp  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); #BsW  
  bRegistered=FALSE; P].eAAXnP  
 } L/yaVU{aEb  
 cMask=mask; :> SLQ[1  
 cKey=key; \9w~pO  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); GV5qdD(  
 return bRegistered; "kU]  
} 1 DqX:WM6  
h/HH Kn  
  四、小结 `]jqQr97  
?_%u)S*g  
  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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