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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: _Sgk^i3v  
  Fy@#r+PgWp  
  一、实现方法 PR@4' r|a  
7s8<FyFsjd  
  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: (Ef2 w[ '  
Mj B< \g>  
#pragma data_seg("shareddata") Dg>'5`&  
HHOOK hHook =NULL; //钩子句柄 $wYuH9(  
UINT nHookCount =0; //挂接的程序数目 _d[2_b1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ?[ S >&Vq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 j&[.2PW\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey vbA7I<;  
static int KeyCount =0; L);||]B  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #i+P(xV  
#pragma data_seg() g)9JO6]  
Krr?`n  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 |c oEBFG  
-S,ir  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Dl zmAN  
8 5%Pq:E  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR otz_nF;E  
cKey,UCHAR cMask) >2lAy:B5  
{ ~w1{zxs  
 BOOL bAdded=FALSE; fs rg2:kQ  
 for(int index=0;index<MAX_KEY;index++){ +(<n |~  
  if(hCallWnd[index]==0){ <RoX|zJw  
   hCallWnd[index]=hWnd; 20/P M9  
   HotKey[index]=cKey; i|c`M/) h:  
   HotKeyMask[index]=cMask; ST: v3*  
   bAdded=TRUE; !#c[~erNZ  
   KeyCount++; 6)#- 5m  
   break; )iEa2uJ  
  } ti{H(;;@  
 } yZ;k@t_WRD  
 return bAdded; Nxbd~^j  
} D%jD 8p  
//删除热键 GP{$v:RG  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "rjv5*z^&  
{ "#-Nqq  
 BOOL bRemoved=FALSE; mmrW`~-  
 for(int index=0;index<MAX_KEY;index++){ "[Qb'9/Jc  
  if(hCallWnd[index]==hWnd){ =j|v0& AGC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t,=@hs hN  
    hCallWnd[index]=NULL; r,u<y_YW  
    HotKey[index]=0; P~Te+ -jX}  
    HotKeyMask[index]=0; *xX( !t'  
    bRemoved=TRUE; Jt-X mGULB  
    KeyCount--; [GR]!\!%~  
    break; ]cF1c90%  
   } <\1}@?NGC  
  } r^w\9a_  
 } z-KrQx2  
 return bRemoved; O)R7t3t  
} C.yY8?|  
+Cn yK(V  
|D;_:x9  
  DLL中的钩子函数如下: 9N~8s6Ob  
$6:XsrV\a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E8T"{ R80  
{ !j!Z%]7  
 BOOL bProcessed=FALSE; 9RG\UbX)^|  
 if(HC_ACTION==nCode) vp\PYg;x  
 { ! Q|J']|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 JqI6k6~Q^  
   switch(wParam) v!<PDw2'  
   {  hmK8j l<6  
    case VK_MENU: j+_S$T8w  
     MaskBits&=~ALTBIT; \6`v.B&v  
     break; 2 ) TG  
    case VK_CONTROL: $ZQl IJZ  
     MaskBits&=~CTRLBIT; 6 QN1+MwB  
     break; 8- dRdQu]  
    case VK_SHIFT: 4R& *&GZ#  
     MaskBits&=~SHIFTBIT; l `fW{lh  
     break; 8A2if 9E3  
    default: //judge the key and send message w1wXTt  
     break; k~0#'I9  
   } =4frP*H?  
   for(int index=0;index<MAX_KEY;index++){ PHQ{-b?4t  
    if(hCallWnd[index]==NULL) $.oOG"u0]  
     continue; 0s 860Kn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <A#5v\{.;~  
    { G_V.H \w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); JQ*D   
     bProcessed=TRUE; uz*d^gr}  
    } E4Y "X  
   } wXc,FD$  
  } ~?FK ; (  
  else if((lParam&0xc000ffff)==1){ //有键按下 )-0[ra]  
   switch(wParam) o;ik Z*+*  
   { :fxWz%t  
    case VK_MENU: mWNR(()v  
     MaskBits|=ALTBIT; 90Xt_$_}s  
     break; CdX`PQ  
    case VK_CONTROL: >j&1?M2C  
     MaskBits|=CTRLBIT; _FL<egK  
     break; 9aTL22U?  
    case VK_SHIFT: %lXbCE:[  
     MaskBits|=SHIFTBIT; F|ETug n  
     break; Jzk!K@  
    default: //judge the key and send message Y{,2X~ 7  
     break; ?ouV  
   } HDyQzCG,  
   for(int index=0;index<MAX_KEY;index++){ fucUwf\_  
    if(hCallWnd[index]==NULL) YV*b~6{d  
     continue; 6dF$?I&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bX7EO 8  
    { [!^cd%l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ows^W8-w  
     bProcessed=TRUE; 6H0W`S0a  
    } p?Z(rCp  
   } 3f_i1|>)'  
  } .FuA;:@%\  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 a lrt*V|=  
   for(int index=0;index<MAX_KEY;index++){ CNut{4  
    if(hCallWnd[index]==NULL) }.'Z =yy  
     continue; F#6cF=};@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) DYX-5~;!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /E)9v$!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Z,3 CC \  
   } <lFdexH"T  
  } ]x2Jpk99a  
 } 6A}eSG3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !&W|myN^  
} (/'h4KS@  
KZ]r8  
  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: }xqXd%uz  
$)Wb#B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @\ }sb]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PJCnud F  
G=1m] >I8  
  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: PCtkjd  
3 :UA<&=s  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) NW)M?f+6  
{ H- 185]7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Yr+d1(  
 { N3Z iGD  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [6_"^jgH  
  SaveBmp(); N?$7 Z v[G  
  return FALSE; c )03Ms4 D  
 } ?!H)zz6y  
 …… //其它处理及默认处理 9/G!0uE  
} d]MGN^%o  
90p3V\LO  
i(0hvV>'  
  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。 BH5w@  
prUHjS  
  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。 $R";  
0rcjorWI  
  二、编程步骤 ^PC\E}  
~ Yl<S(/4  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; wk@yTTnb  
i *B:El1  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; [yC"el6PM  
/tP7uVL R  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; U%q:^S%#eG  
Wk}D]o0^@  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; FOSbe]  
@HvScg*Y  
  5、 添加代码,编译运行程序。 d5:tSO  
dhW<p 5  
三、程序代码 dnwdFsf  
O4E(R?wd  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL l~['[Ub0)  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ~5ubh2{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ?gN9kd)  
#if _MSC_VER > 1000 R4SxFp  
#pragma once _jmkl B  
#endif // _MSC_VER > 1000 3%2jwR  
#ifndef __AFXWIN_H__ *0~M  
#error include 'stdafx.h' before including this file for PCH n$YE !D'  
#endif 2m\m/O  
#include "resource.h" // main symbols -E]Sk&4Gj  
class CHookApp : public CWinApp lBmm(<~Z  
{ U. (Tl>K|0  
 public: ESIzGaM  
  CHookApp(); 5U~OP  
  // Overrides HlPG3LD!  
  // ClassWizard generated virtual function overrides >t0%?wj)Y  
  //{{AFX_VIRTUAL(CHookApp) @zrNN>  
 public: ]\BUoQ7I/  
  virtual BOOL InitInstance(); a.DX%C /5  
  virtual int ExitInstance(); [sj VRW-  
  //}}AFX_VIRTUAL G'9{a'  
  //{{AFX_MSG(CHookApp) /l6\^Xf{  
  // NOTE - the ClassWizard will add and remove member functions here. H|`R4hAk  
  // DO NOT EDIT what you see in these blocks of generated code ! &bLC(e ]  
  //}}AFX_MSG 74_xR  
  DECLARE_MESSAGE_MAP() ~.6|dw\p!  
}; 7]s%r ya  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !}5*?k g  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qg4fR' i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 72,"Cj  
BOOL InitHotkey(); +T2HE\  
BOOL UnInit(); Qci$YTwl>  
#endif sAYV)w3u"  
g4wZvra6%)  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. VgMP^&/gZ  
#include "stdafx.h" m?;$;x~Dj  
#include "hook.h" x@m<Ym-  
#include <windowsx.h> 4LsHs   
#ifdef _DEBUG KDD@%E  
#define new DEBUG_NEW @rwU 1T33  
#undef THIS_FILE xGRT"U(  
static char THIS_FILE[] = __FILE__; $KX[Zu%  
#endif ~@Kf2dHes  
#define MAX_KEY 100  so fu  
#define CTRLBIT 0x04 kaQ2A  
#define ALTBIT 0x02 9tk" :ld  
#define SHIFTBIT 0x01 .45^=2NGmQ  
#pragma data_seg("shareddata") +j[`,5oS  
HHOOK hHook =NULL; :Q-oV8t{  
UINT nHookCount =0; d0 -~| `5  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey HH8;J66I&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT etyCrQ ?U  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey c@(1:,R  
static int KeyCount =0; hH`Jb7 7L  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @o#+5P  
#pragma data_seg() $"8d:N?I[  
HINSTANCE hins; kXwi{P3D$  
void VerifyWindow(); %LQ/q 3?_  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) n+;vjVS%  
//{{AFX_MSG_MAP(CHookApp) P+Z\3re  
// NOTE - the ClassWizard will add and remove mapping macros here. n3ZAF'  
// DO NOT EDIT what you see in these blocks of generated code! hD q2-X}  
//}}AFX_MSG_MAP U -EhPAB@  
END_MESSAGE_MAP() "K?Q  
,w2WS\`%  
CHookApp::CHookApp() b/<mRQ{  
{ [AR>?6G-  
 // TODO: add construction code here, (A{NF(   
 // Place all significant initialization in InitInstance r5 yO5W  
} Oq+E6"<y;?  
OOB^gf}$'  
CHookApp theApp; zZ=$O-&%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) YH\j@ ^n  
{ `FJ|W6%  
 BOOL bProcessed=FALSE; {Q~7M$  
 if(HC_ACTION==nCode) aFY u}kl  
 {  KG8W8&q  
  if((lParam&0xc0000000)==0xc0000000){// Key up fg&eoI'f  
   switch(wParam) u 9]1X1wV  
   {  &?+WXL>  
    case VK_MENU: ll<mE,  
     MaskBits&=~ALTBIT; |0 !I5|<k  
     break; <o0~H  
    case VK_CONTROL: )acV-+{  
     MaskBits&=~CTRLBIT; tln1eN((q  
     break; ."mlSW"Wm  
    case VK_SHIFT: ai;\@$ cq  
     MaskBits&=~SHIFTBIT; 4:1)~z  
     break; Mo^`\ /x!  
    default: //judge the key and send message jN/ j\x'  
     break; 'RTtE  
   } QCpM|,drS  
   for(int index=0;index<MAX_KEY;index++){ V1<`%=%_W  
    if(hCallWnd[index]==NULL) +a$|Sc  
     continue; X:=c5*0e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ut &/\k=N  
    { 6 h'&6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;7rv  
     bProcessed=TRUE; c2<,|D|  
    } k^An97J  
   } saW!9HQj  
  } $}tjS3klr  
  else if((lParam&0xc000ffff)==1){ //Key down ?)i1b\4Go  
   switch(wParam) it1/3y =]  
   { {1~T]5  
    case VK_MENU: Do*n#=  
     MaskBits|=ALTBIT; R1%y]]*-P  
     break; .y):Rh^  
    case VK_CONTROL: AK2WN#u@Z  
     MaskBits|=CTRLBIT; n29(!10Px  
     break; j*zD0I]  
    case VK_SHIFT: q;A;H)?g  
     MaskBits|=SHIFTBIT; lTz6"/  
     break; vV^dm)?  
    default: //judge the key and send message Dp!zk}f|  
     break; ]b}B2F'n  
   } &erm`Ho  
   for(int index=0;index<MAX_KEY;index++) }htPTOy5  
   { MFwO9"<A  
    if(hCallWnd[index]==NULL) YBjdp=als  
     continue; YD&_^3-XM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KQmZ#W%2m  
    { N 8t=@~]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _H\<[-l  
     bProcessed=TRUE; n&!+wcJ;Yt  
    } JP'= UZ'  
   } W`L!N&fB  
  } %Q4i%:Qi  
  if(!bProcessed){ ngUHkpYS5  
   for(int index=0;index<MAX_KEY;index++){ d`%M g&  
    if(hCallWnd[index]==NULL) 44-r\>  
     continue; K ,isjh2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `|Fp^gM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Ceg!w#8Z,  
   } =2 jhII  
  } l[YEKg  
 } C-SLjJw  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); PC/!9s 0W  
} yV]xRaRr2  
R$6qoqv{yG  
BOOL InitHotkey() =r6qX  
{ +nU.p/cK+\  
 if(hHook!=NULL){ 3-x%wD.  
  nHookCount++; geGeZ5+B  
  return TRUE; 8MF2K6  
 } fN[8N$1-  
 else xPC"c*  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); p538r[f<  
  if(hHook!=NULL) m#H_*L0  
   nHookCount++; T V:<TR  
  return (hHook!=NULL); j _ ;fWBD:  
} z<n-Gzwk  
BOOL UnInit() tXq)nfGe{  
{ wE Qi0!  
 if(nHookCount>1){ FPv" N'/  
  nHookCount--; &jf7k <^  
  return TRUE; )=_ycf^MC  
 } Y &f\VNlT  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 6|=j+rScv  
 if(unhooked==TRUE){ :zp`6l  
  nHookCount=0; "H+,E_&(  
  hHook=NULL; ijW 7c+yd  
 } _\zQ"y|G  
 return unhooked; PT_KXk  
} oXgdLtsu  
IeTdN_8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;l!`C':'  
{ yrr) y  
 BOOL bAdded=FALSE; ?R'Y?b  
 for(int index=0;index<MAX_KEY;index++){ # c Fr   
  if(hCallWnd[index]==0){ TFH&(_b  
   hCallWnd[index]=hWnd; 4gZ &^y'  
   HotKey[index]=cKey; OW5t[~y]  
   HotKeyMask[index]=cMask; q7Es$zjX  
   bAdded=TRUE; _vl}*/=Hc  
   KeyCount++; 4JMiyiW&  
   break; /q1s;I  
  } .-]R9KjR1J  
 } !I8f#'p  
 return bAdded; .6.^G  
} x;#zs64f  
z2 hFn&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qqOFr!)g  
{ ~]fJlfR*  
 BOOL bRemoved=FALSE; YpmYxd^  
 for(int index=0;index<MAX_KEY;index++){ HW6.O|3  
  if(hCallWnd[index]==hWnd){ $c9k*3{<+A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Tls a%pn  
    hCallWnd[index]=NULL; A Y9 9!p  
    HotKey[index]=0; tP(h9|[N  
    HotKeyMask[index]=0; bcz-$?]  
    bRemoved=TRUE; ]?<n#=eW  
    KeyCount--; Y83GKh,*  
    break; s&tE_  
   } qVgd(?hJ#  
  } h @/;`E[  
 } >k(MUmhX  
 return bRemoved; H^AE|U*-G  
} S4A q'  
Qc"'8kt  
void VerifyWindow() D"l+iVbBP  
{ 8q^o.+9  
 for(int i=0;i<MAX_KEY;i++){ g>j| ]6  
  if(hCallWnd!=NULL){ SF<Vds}A2  
   if(!IsWindow(hCallWnd)){ f =s&n}  
    hCallWnd=NULL; Mr3-q  
    HotKey=0; MC!ZX)mF  
    HotKeyMask=0; UY>v"M  
    KeyCount--; 9 [Y-M  
   } C"eXs#A  
  } QMp r v*i  
 } ]r/^9XaqtA  
} p]&j;H.  
wij,N(,H  
BOOL CHookApp::InitInstance() GjT#%GBF  
{ FN87^.^2S  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); MDO$m g  
 hins=AfxGetInstanceHandle(); ^v ni&sJ  
 InitHotkey(); wEEn?  
 return CWinApp::InitInstance(); WFv!Pbq,  
} ,.mBJ SE3  
}iiHr|l3  
int CHookApp::ExitInstance() S2^>6/[xM  
{ {qpi?oY  
 VerifyWindow(); ZxHJ<2oD  
 UnInit(); w# y2_  
 return CWinApp::ExitInstance(); (Tvcq  
} 7+,vTsCd  
-n))*.V  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file l54 m22pfv  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) $:bih4 @>  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ M {a #  
#if _MSC_VER > 1000 {6,|IGAq V  
#pragma once LR&_2e^[  
#endif // _MSC_VER > 1000 m5c&&v6%"b  
pbBoy+.>  
class CCaptureDlg : public CDialog +wfVL|.Wq  
{ /b[2lTC-e  
 // Construction lP _db&  
 public: 7&%^>PU7  
  BOOL bTray; :8f[|XR4\N  
  BOOL bRegistered; E3l*8F%<3  
  BOOL RegisterHotkey(); E`;;&V q-  
  UCHAR cKey; 5J.0&Dda  
  UCHAR cMask; )e%}b -I'r  
  void DeleteIcon(); !]koSw}  
  void AddIcon(); @F5f"8!.\  
  UINT nCount; {7"0,2 Hb?  
  void SaveBmp(); t#wmAOW  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor yI;"9G  
  // Dialog Data "VUYh$=[  
  //{{AFX_DATA(CCaptureDlg) [0@`wZ  
  enum { IDD = IDD_CAPTURE_DIALOG }; @!%n$>p/V  
  CComboBox m_Key; !DXNo(:r  
  BOOL m_bControl; 5>_5]t {  
  BOOL m_bAlt; k2^a$k}  
  BOOL m_bShift; j;nb?;  
  CString m_Path; ;`j/D@H  
  CString m_Number; X@wm1{!  
  //}}AFX_DATA 1y"3  
  // ClassWizard generated virtual function overrides ^Z,q$Gp~P  
  //{{AFX_VIRTUAL(CCaptureDlg) l* dV\ B  
 public: vZAv_8S)  
  virtual BOOL PreTranslateMessage(MSG* pMsg); O[q\e<V<  
 protected: VG@};dwbz*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6[P-Ny{z  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6^F '|Wh  
  //}}AFX_VIRTUAL kdrod[S  
  // Implementation 1%~ZRmd e  
 protected: Im72Vt:p-  
  HICON m_hIcon; wa09$4>_w  
  // Generated message map functions 4B[D/kIg  
  //{{AFX_MSG(CCaptureDlg) E1V^}dn  
  virtual BOOL OnInitDialog(); 7}o/:  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); HIc a nk  
  afx_msg void OnPaint(); OM83S|1s  
  afx_msg HCURSOR OnQueryDragIcon(); _ -..~K.|  
  virtual void OnCancel(); LF<wt2?*  
  afx_msg void OnAbout(); =?Fkn4t  
  afx_msg void OnBrowse(); \Ad7 Gi~  
  afx_msg void OnChange(); kBWrqZ6  
 //}}AFX_MSG ](0mjE04<d  
 DECLARE_MESSAGE_MAP() GHc/Zc"iX  
}; ?A*Kg;IU  
#endif {3\R|tZh,`  
wxQ>ifi9Z  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /BA{O&Ro^  
#include "stdafx.h" al^!,ykc  
#include "Capture.h" +OaUP*\Dd  
#include "CaptureDlg.h" 5]Da{Wmgs  
#include <windowsx.h> b~Y%gC)FR  
#pragma comment(lib,"hook.lib") 4vZ4/#(x  
#ifdef _DEBUG N3A<:%s  
#define new DEBUG_NEW L EWhb!U  
#undef THIS_FILE `#s#it'y  
static char THIS_FILE[] = __FILE__; ~W#sTrK  
#endif Gwec 4D  
#define IDM_SHELL WM_USER+1 @_ygnNn4R  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n{5NNV6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {,$rkwW  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P }7zE3V  
class CAboutDlg : public CDialog kPxT" " k  
{ z}4L=KR\v  
 public: _k66Mkd#b  
  CAboutDlg(); s4LO&STh{  
  // Dialog Data rxZi8w>}  
  //{{AFX_DATA(CAboutDlg) qv2!grp]*W  
  enum { IDD = IDD_ABOUTBOX }; ~qVz)<  
  //}}AFX_DATA 2?7(A  
  // ClassWizard generated virtual function overrides Tbbz'b;{  
  //{{AFX_VIRTUAL(CAboutDlg) B|=|.qp$)  
 protected: 0"WDH)7hJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support IzLF'F  
  //}}AFX_VIRTUAL -6~'cm  
  // Implementation (nSml,gU  
 protected: 0JyVNuHn  
  //{{AFX_MSG(CAboutDlg) HM[klH]s=  
  //}}AFX_MSG ]1`g^Z@ 0  
  DECLARE_MESSAGE_MAP()   WY  
}; Y g|lq9gD  
&p(0K4:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) u_O# @eOc  
{ X$?3U!  
 //{{AFX_DATA_INIT(CAboutDlg) 48D?'lW %  
 //}}AFX_DATA_INIT r4}*l7Q  
} %ati7{2!  
.giz=* q+  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) . )XP\ m\  
{ ^-)txC5{T  
 CDialog::DoDataExchange(pDX); GRqT-/n"  
 //{{AFX_DATA_MAP(CAboutDlg) 77 r(*.O|  
 //}}AFX_DATA_MAP vG.9 H_&  
} T3%C%BcX  
k\)Cw  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0Rn+`UnwB  
 //{{AFX_MSG_MAP(CAboutDlg) NaUr!s  
 // No message handlers <X7\z  
 //}}AFX_MSG_MAP PgM(l3x  
END_MESSAGE_MAP() )U t5+-UK  
< Bg8,;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;T+pu>)  
: CDialog(CCaptureDlg::IDD, pParent) j+4H}XyE  
{ *Ust[u  
 //{{AFX_DATA_INIT(CCaptureDlg) KP"%Rm`XN  
  m_bControl = FALSE; `_X;.U.Mv  
  m_bAlt = FALSE; !p"aAZT7sq  
  m_bShift = FALSE; m6mwyom.  
  m_Path = _T("c:\\"); ~g;   
  m_Number = _T("0 picture captured."); {MdLX.ycc)  
  nCount=0; k0z&v <  
  bRegistered=FALSE; !BIOY!M  
  bTray=FALSE; 2{,n_w?Wy  
 //}}AFX_DATA_INIT 9SQ4cv*2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @p=AWi}\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ShOX<Fb&  
} T(?HMyg3  
bO5k6i  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Ddju~510  
{ 25y6a|`  
 CDialog::DoDataExchange(pDX); Ucw yxX I  
 //{{AFX_DATA_MAP(CCaptureDlg) _Xcn N:Rt  
  DDX_Control(pDX, IDC_KEY, m_Key); `YBkF  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); G bP!9I  
  DDX_Check(pDX, IDC_ALT, m_bAlt); [V8fu qE>  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); M\<w#wZ  
  DDX_Text(pDX, IDC_PATH, m_Path); H].y w9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); $(pF;_W  
 //}}AFX_DATA_MAP ; 0v>Rfa  
} | tQiFC  
fnKY1y]2+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6.1)IQkO  
//{{AFX_MSG_MAP(CCaptureDlg) u"xJjS  
 ON_WM_SYSCOMMAND() K0pac6]  
 ON_WM_PAINT() {XurC}#\  
 ON_WM_QUERYDRAGICON() BP[|nL  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ^ZDBO/  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =WZqQq{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 5~sx:0;  
//}}AFX_MSG_MAP I751 t  
END_MESSAGE_MAP() 9Z"+?bv/  
"Ml&[O ge  
BOOL CCaptureDlg::OnInitDialog() ykg#{9+  
{ Sw&!y$ed  
 CDialog::OnInitDialog(); 0JuD ^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d%@~mcH>  
 ASSERT(IDM_ABOUTBOX < 0xF000); 1nknSw#  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {:nQl}  
 if (pSysMenu != NULL) \!50UVzm)  
 { EpJ4`{4  
  CString strAboutMenu; Z#l%r0(o  
  strAboutMenu.LoadString(IDS_ABOUTBOX); T\s)le  
  if (!strAboutMenu.IsEmpty()) zLw{ {|  
  { BI?@1q}:  
   pSysMenu->AppendMenu(MF_SEPARATOR); zh I#f0c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6M.;@t,Y  
  } YV4#%I!<  
 } (6p]ZY  
 SetIcon(m_hIcon, TRUE); // Set big icon #zUXyT#X  
 SetIcon(m_hIcon, FALSE); // Set small icon qo6y %[  
 m_Key.SetCurSel(0); zQ6p+R7D  
 RegisterHotkey(); 0H_!Kg  
 CMenu* pMenu=GetSystemMenu(FALSE); H5cV5E0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wd@aw/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); rX7QbAB  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s?Uh|BfB  
 return TRUE; // return TRUE unless you set the focus to a control r`S< A;  
} AdZ;j6#  
^E`(*J/o  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) nwt C:*}  
{ nR>r2wMk@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) RF!a//  
 { X6+qpp  
  CAboutDlg dlgAbout; VQI(Vp|  
  dlgAbout.DoModal(); E`H$YS3o  
 } XZNY4/ 25G  
 else -m= 8&B  
 { m9}AG Rj  
  CDialog::OnSysCommand(nID, lParam); DmVP  
 } GV6K/T :  
} p}b/XnV$~  
pg+[y<B  
void CCaptureDlg::OnPaint() KfCoe[Vv  
{ 5BkV aF7Th  
 if (IsIconic()) *1Z5+uVT[  
 { y7i%W4  
  CPaintDC dc(this); // device context for painting FSuAjBl0-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); iJxQB\x  
  // Center icon in client rectangle h0Z{,s}  
  int cxIcon = GetSystemMetrics(SM_CXICON); g$:Xuw1  
  int cyIcon = GetSystemMetrics(SM_CYICON); m4E)qCvy  
  CRect rect; 88"Sai  
  GetClientRect(&rect); 3=Ec "  
  int x = (rect.Width() - cxIcon + 1) / 2; <mMTD8Sx]  
  int y = (rect.Height() - cyIcon + 1) / 2; g42)7  
  // Draw the icon `cQo0{xK  
  dc.DrawIcon(x, y, m_hIcon); F 09DV<j  
 } $eV$2p3H  
 else :4S%'d7  
 { ZR v"h/~  
  CDialog::OnPaint(); RC|!+ TD  
 } IPSF]"}~  
} )Rat0$6  
8n BL\{'B[  
HCURSOR CCaptureDlg::OnQueryDragIcon() Ioy  
{ 4Tc&IwR  
 return (HCURSOR) m_hIcon; Zc |/{$>:W  
} Lj\/Ji_  
ik|-L8  
void CCaptureDlg::OnCancel() 7+TiyY]K  
{ S_T^G` [  
 if(bTray) Sw`RBN[ yo  
  DeleteIcon(); F;lI+^}}  
  CDialog::OnCancel(); depYqYK7G  
} <WXzh5D2  
aq+Y7IR_  
void CCaptureDlg::OnAbout() "jecsqCgK0  
{ :f5s4N  
 CAboutDlg dlg; Q(d9n8  
 dlg.DoModal(); %B 5r"=oO  
} 'evj,zFhW  
l:6,QaT1  
void CCaptureDlg::OnBrowse() @=]~\[e\  
{ ~1m2#>  
 CString str; R8L_J6Kpa  
 BROWSEINFO bi; u JR%0E7!  
 char name[MAX_PATH]; U`Jy!x2m  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .O*bILU  
 bi.hwndOwner=GetSafeHwnd(); )4?x5#  
 bi.pszDisplayName=name; !}\4u tHY  
 bi.lpszTitle="Select folder"; /<CSVJ_r  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =@u 5|:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); dLsn\m>  
 if(idl==NULL) xCzebG["  
  return; B()/.w?A  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "xMD,}+5$$  
 str.ReleaseBuffer(); 1Kvx1p   
 m_Path=str; i`/+,<  
 if(str.GetAt(str.GetLength()-1)!='\\') b5m=7;u*h  
  m_Path+="\\"; f\;65k_jq  
 UpdateData(FALSE); f"7M^1)h2%  
} Z34Wbun4  
]Q "p\@\!  
void CCaptureDlg::SaveBmp() /MB{Pmk$R  
{ jEc|]E  
 CDC dc; IvpcSam'  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;Zj]~|  
 CBitmap bm; +9O5KI?P  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2,vB'CAI  
 int Height=GetSystemMetrics(SM_CYSCREEN); 7:]Pl=:X  
 bm.CreateCompatibleBitmap(&dc,Width,Height); J`IDlGFYp  
 CDC tdc; G a;.a  
 tdc.CreateCompatibleDC(&dc); M fk2mIy  
 CBitmap*pOld=tdc.SelectObject(&bm); O=)  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); H$ftGwS8  
 tdc.SelectObject(pOld); [ rNXQ` /  
 BITMAP btm; ,U )"WLmY  
 bm.GetBitmap(&btm); Kx"<J@  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; SxyONp.$\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); w|mb4AyL{?  
 BITMAPINFOHEADER bih; KtS)'jf  
 bih.biBitCount=btm.bmBitsPixel; d|Gl`BG   
 bih.biClrImportant=0; 5dx&Qu'}ZS  
 bih.biClrUsed=0; Fg$3N5*  
 bih.biCompression=0; o!E v;' D  
 bih.biHeight=btm.bmHeight; juAMAplf  
 bih.biPlanes=1; dX8hpQ  
 bih.biSize=sizeof(BITMAPINFOHEADER); #B'aU#$u  
 bih.biSizeImage=size; + SZYg[  
 bih.biWidth=btm.bmWidth; 5_0(D;Q  
 bih.biXPelsPerMeter=0; @ P@c.*}s  
 bih.biYPelsPerMeter=0; %pu Lr'Y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); DlMe5=n -u  
 static int filecount=0; #X: 'aj98  
 CString name; D3Jr3 %>  
 name.Format("pict%04d.bmp",filecount++); 53HU.  
 name=m_Path+name; =k3!RW'  
 BITMAPFILEHEADER bfh; %2'A pp  
 bfh.bfReserved1=bfh.bfReserved2=0; S1n3(U:m  
 bfh.bfType=((WORD)('M'<< 8)|'B'); j4FeSGa  
 bfh.bfSize=54+size; Lf:uNl*D  
 bfh.bfOffBits=54; oHM ]  
 CFile bf; *O:r7_ Y0  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :ztr)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); h@7FY  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ?^' 7+8C*J  
  bf.WriteHuge(lpData,size); UE _fpq  
  bf.Close(); cN! uV-e  
  nCount++; nqR?l4 DX  
 } L?_7bX oD  
 GlobalFreePtr(lpData); : FAH\  
 if(nCount==1) >}~#>Ru  
  m_Number.Format("%d picture captured.",nCount); /wQL  
 else ]DFXPV  
  m_Number.Format("%d pictures captured.",nCount); U,/6;}  
  UpdateData(FALSE); eLwTaW !C  
} ;E~4)^  
K\[!SXg@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) y AF+bCXo  
{ ~/_9P Fk  
 if(pMsg -> message == WM_KEYDOWN) =1h9rlFj"D  
 { jO9ip  
  if(pMsg -> wParam == VK_ESCAPE) _FbC{yI8;  
   return TRUE; d-bqL:/  
  if(pMsg -> wParam == VK_RETURN) ZaFb*XRgS  
   return TRUE; s"=6{EVqk3  
 } 2y0J`!/)  
 return CDialog::PreTranslateMessage(pMsg); k)S.]!u&G  
} tg4Y i|5  
zWw2V}U!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) w)E@*h<Z  
{ A6<C-1 N}j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [#" =yzR<3  
  SaveBmp(); aI zv  
  return FALSE; c_{z(W"  
} F} J-gZl  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /9Q3iV$I]  
 CMenu pop; nM=e]qH  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Y**|N8e  
 CMenu*pMenu=pop.GetSubMenu(0); 4!$ M q;U  
 pMenu->SetDefaultItem(ID_EXITICON); -7WW[ w  
 CPoint pt; 78n=nHS  
 GetCursorPos(&pt); 2^~<("+w  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); B;Nl~Y|\  
 if(id==ID_EXITICON) ^Yr0@pE  
  DeleteIcon(); 1rw0sAuGy  
 else if(id==ID_EXIT) W]<$0  
  OnCancel(); K.tlo^#^B[  
 return FALSE; "Z,q?Fc  
} J?)RfK|!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); LCXO>MXN  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ZZ/cq:3$P  
 AddIcon(); @#+jMV$g  
 return res; p\wJD1s  
} lM\LN^f5*  
zHB_{(o7  
void CCaptureDlg::AddIcon() ocwG7J\W  
{ y;" n9  
 NOTIFYICONDATA data; /4=-b_2Y~  
 data.cbSize=sizeof(NOTIFYICONDATA); C`oa3B,z  
 CString tip; si1*Wt<3Bc  
 tip.LoadString(IDS_ICONTIP); _\5~>g_  
 data.hIcon=GetIcon(0); 71FeDpe  
 data.hWnd=GetSafeHwnd(); @$Qof1j'%  
 strcpy(data.szTip,tip); mOll5O7VW  
 data.uCallbackMessage=IDM_SHELL; fbrp#G71y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1Wg-x0R  
 data.uID=98; :(3|HTz  
 Shell_NotifyIcon(NIM_ADD,&data); NX* O_/  
 ShowWindow(SW_HIDE); ir> ]r<Zl  
 bTray=TRUE; l2v_?j-)x  
} {TSY|D2  
Tm+;0  
void CCaptureDlg::DeleteIcon() dtM[E`PL  
{ NQTnhiM7$  
 NOTIFYICONDATA data; u'Q?T7  
 data.cbSize=sizeof(NOTIFYICONDATA); *E>.)B i  
 data.hWnd=GetSafeHwnd(); [c K^+s)N  
 data.uID=98; *#>F.#9  
 Shell_NotifyIcon(NIM_DELETE,&data); c"YXxA J  
 ShowWindow(SW_SHOW); I"L;L?\S  
 SetForegroundWindow(); $X`y%*<<v  
 ShowWindow(SW_SHOWNORMAL); CF y}r(q  
 bTray=FALSE;  R)Q 4  
} 9V1cdb~?"T  
P=AS>N^yaL  
void CCaptureDlg::OnChange() $*MCU nl  
{ Ob+9W  
 RegisterHotkey(); 6@;ha=[+  
} TDK@)mP  
wWW~_zP0  
BOOL CCaptureDlg::RegisterHotkey() Q.-*7h8  
{ *ck}|RhR  
 UpdateData(); YZ#V#[j'^  
 UCHAR mask=0; D  _X8-  
 UCHAR key=0; &!.HuRiuC  
 if(m_bControl) iMP  
  mask|=4; -=$2p0" R  
 if(m_bAlt) dLh6:Gh8_I  
  mask|=2; |fsm8t<~8  
 if(m_bShift) -*VKlZ8-  
  mask|=1; -H(vL=  
  key=Key_Table[m_Key.GetCurSel()]; H(u+#PIIw  
 if(bRegistered){ 4|J[Jdj  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ; ~ 4k7Uz  
  bRegistered=FALSE; jjOgG-Q  
 } jdRq6U^  
 cMask=mask; ;Kxbg>U  
 cKey=key; bPD)D'Hs  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9 wa,k  
 return bRegistered; q1Qje%9@t  
} 8 ,}ikOZ?  
#~Q=h`9  
  四、小结 Bl.u=I:Y4  
eBB:~,C^q.  
  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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