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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: U2hPsF4f  
  [u?*' c{  
  一、实现方法 JXT%@w>I  
Z}X oWT2f  
  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: pt/UY<@yoN  
LgG7|\(-  
#pragma data_seg("shareddata") ZnrsJ1f:  
HHOOK hHook =NULL; //钩子句柄 p?@R0]  
UINT nHookCount =0; //挂接的程序数目 &- 5`Oln  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 3EY>XS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 30BFwNE  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey QaVxP1V#U  
static int KeyCount =0; Ca2He}r`  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -'!K("  
#pragma data_seg() $m hIX A.  
 AqqD!  
  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。 st7\k]J\  
MC'2;,  
  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: ejF GeR  
{pWb*~!k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR E \p Qh  
cKey,UCHAR cMask) Xl/ SDm_p  
{ rofGD9f   
 BOOL bAdded=FALSE; $Gy&  
 for(int index=0;index<MAX_KEY;index++){ 8D H~~by  
  if(hCallWnd[index]==0){ Sa8KCWgWh  
   hCallWnd[index]=hWnd; U{`Q_Uw@$:  
   HotKey[index]=cKey; 7%MD0qm-  
   HotKeyMask[index]=cMask; e7O9q8b  
   bAdded=TRUE; MbT;]Bo  
   KeyCount++; l_q=@y  
   break; &EUI  
  } d O})#50f  
 } 1QA{NAnu&  
 return bAdded; v47S9Vm+  
} V(6*wQ`&  
//删除热键 sxK|0i}6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tyI !y~-z  
{ $`a>y jma  
 BOOL bRemoved=FALSE; >b1#dEY  
 for(int index=0;index<MAX_KEY;index++){ tz^2?wO  
  if(hCallWnd[index]==hWnd){ ',_E;(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Tr6J+hS  
    hCallWnd[index]=NULL; }CM</  
    HotKey[index]=0; }EMds3<  
    HotKeyMask[index]=0; R(^2+mV?  
    bRemoved=TRUE; 7A,lQh  
    KeyCount--; `SfBT1#5G  
    break; ;h"St0   
   } B=<Z@u  
  } hf`5NcnP  
 } VG=mA4Dd  
 return bRemoved;  /N8>>g  
} .#OD=wkN0  
2 -C*RHRx  
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  DLL中的钩子函数如下: w7d<Ky_C  
o9XT_!Cwg  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ! ^ DQX=1  
{ id?B<OM  
 BOOL bProcessed=FALSE; h>a/3a$g  
 if(HC_ACTION==nCode) W'xJh0o  
 { #Fwf]{J  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *.,G;EC^  
   switch(wParam) pYBY"r  
   {  <E&8g[x6  
    case VK_MENU: $sxm MP  
     MaskBits&=~ALTBIT; P}re"<MD  
     break; L|`(u  
    case VK_CONTROL: x & ZW f?  
     MaskBits&=~CTRLBIT; 0XzrzT"&  
     break; O;6am++M@  
    case VK_SHIFT: ll^#I/  
     MaskBits&=~SHIFTBIT; 6rll0c~  
     break; />dH\KvN  
    default: //judge the key and send message u}0U!  
     break; |y%M";MI  
   } -Pt']07E  
   for(int index=0;index<MAX_KEY;index++){ = }!4%.$  
    if(hCallWnd[index]==NULL) IQ] tcSQl  
     continue; sy(8-zbI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !uc"|S?  
    { K\VL[HP-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v;ZIqn"  
     bProcessed=TRUE; sQ aP:@  
    } X4$86  
   } 1 k\~%  
  } isR)^fI|  
  else if((lParam&0xc000ffff)==1){ //有键按下 v?L`aj1ox  
   switch(wParam) %2ZWSQD  
   { [dIlt"2fV  
    case VK_MENU: Pw|J([  
     MaskBits|=ALTBIT; GE!fh1[[u  
     break; q(s&2|  
    case VK_CONTROL: W }  
     MaskBits|=CTRLBIT; xsERnF>`  
     break; ) OE!vA  
    case VK_SHIFT: uG^RU\(  
     MaskBits|=SHIFTBIT; U?e.)G  
     break; 2'-!9!C  
    default: //judge the key and send message sKniqWi  
     break; x@Ze%$'  
   } '\wZKY VN  
   for(int index=0;index<MAX_KEY;index++){ hhr!FQ.+/  
    if(hCallWnd[index]==NULL) 2JR$  
     continue; nl/~7({  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n:P++^ j  
    { B(ZK\]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); v2KK%Qy  
     bProcessed=TRUE; lBZhg~{  
    } %4I13|<A`  
   } u}(K3H3  
  } +6;1.5Tc  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 3q)y;T\yW  
   for(int index=0;index<MAX_KEY;index++){ P/Zp3O H  
    if(hCallWnd[index]==NULL) g+pj1ycw/  
     continue; ,b'QL6>`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) )2&y;{]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %|o2d&i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~&%&Z  
   } )Rj,PF-9Z[  
  } Y q(CD!  
 } aTi,gJ;*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7blo<|9  
} 4iC=+YUn  
E%e2$KfD  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: =LyR CrA  
I%'6IpR"d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {Q/_I@m].  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); EF5:$#  
X775j"<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: i"GCm`  
9*CJWS;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9 lH00n+'  
{ TYu(;~   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Q$:>yveR*  
 { lEr_4!h$rZ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 hMQh?sF/  
  SaveBmp(); b75en{aDi*  
  return FALSE; D"ecwx{%;C  
 } @mm~i~~KA  
 …… //其它处理及默认处理 :&\^r=D  
} Xd@_:ds  
" LkI'>3}  
0`~#H1TK  
  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。 0~=>:^H'`q  
JL:\\JT.  
  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。 <wj}y0(  
QQW]j;'~  
  二、编程步骤 oeF0t'%  
~Blsj9a2  
  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"; }:xj%?ki  
x2$Y"b?vz  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; MgrJ ;?L  
B nu5\P  
  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; 5169E*  
;Sw % t(@  
  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; >>R,P Ow-  
9 =zZ,dg  
  5、 添加代码,编译运行程序。 f6U i~  
a F5=k: k  
三、程序代码 vI5'npM  
Tp&7CNl|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %C =?Xhnv  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /PTk296@  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ . yN.  
#if _MSC_VER > 1000 Xb\de_8!  
#pragma once [l:}#5\]4  
#endif // _MSC_VER > 1000 AEO7I f@  
#ifndef __AFXWIN_H__ $G D@e0  
#error include 'stdafx.h' before including this file for PCH du_TiI  
#endif WEsX+okj  
#include "resource.h" // main symbols w)Wg 8  
class CHookApp : public CWinApp ?8TIPz J  
{ OiJz?G:m  
 public: f;cY&GC  
  CHookApp(); c7f11N!v>b  
  // Overrides U#' WP  
  // ClassWizard generated virtual function overrides ! ~3zp L  
  //{{AFX_VIRTUAL(CHookApp) "S^ ""5  
 public: g$9EI\a  
  virtual BOOL InitInstance(); %Z!3[.%F  
  virtual int ExitInstance(); V m]u-R`{  
  //}}AFX_VIRTUAL A#x_>fV  
  //{{AFX_MSG(CHookApp) 6< @F  
  // NOTE - the ClassWizard will add and remove member functions here. MwO`DrV  
  // DO NOT EDIT what you see in these blocks of generated code ! zwJK|Sk  
  //}}AFX_MSG NsUP0B}.  
  DECLARE_MESSAGE_MAP() Lf0Wc'9{  
}; :7 OhplI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); \ ix& U  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;^9y#muk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'FN+BvD  
BOOL InitHotkey(); u~\l~v^mj  
BOOL UnInit(); @; 0t+  
#endif ~xakz BE  
1b`WzoJgH  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. L2`a| T=  
#include "stdafx.h" 7>!Rg~M  
#include "hook.h" l2 mO{'|C  
#include <windowsx.h> dH_g:ocA  
#ifdef _DEBUG 3}gf %U]L  
#define new DEBUG_NEW vq-# %o  
#undef THIS_FILE z=pGu_`2  
static char THIS_FILE[] = __FILE__; JH`oa1 b  
#endif < +X,oxg  
#define MAX_KEY 100 wgFAPZr  
#define CTRLBIT 0x04 29kR7[k  
#define ALTBIT 0x02 w3Z;&sFd  
#define SHIFTBIT 0x01 P{%R*hb]  
#pragma data_seg("shareddata") )9s 6(Iu  
HHOOK hHook =NULL; kcio]@#  
UINT nHookCount =0; ,l7',@6Y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey f,0,:)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT i;I!Jc_b'  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey hjx= ?  
static int KeyCount =0; T)tf!v3v  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift K</="3 HK  
#pragma data_seg() b|E1>TkY  
HINSTANCE hins; *7UDTgY  
void VerifyWindow(); -I*NS6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %h "%G=:  
//{{AFX_MSG_MAP(CHookApp) o*Kl`3=]  
// NOTE - the ClassWizard will add and remove mapping macros here. .XPPd?R  
// DO NOT EDIT what you see in these blocks of generated code! c(r8 F[4w  
//}}AFX_MSG_MAP eiwPp9[08  
END_MESSAGE_MAP() *Vr;rk  
Xot2L{EIUE  
CHookApp::CHookApp() +~f5dJyk`  
{ 1YJ@9*l  
 // TODO: add construction code here, I_3{i`g  
 // Place all significant initialization in InitInstance Q5>]f/LD  
} 87q~ nk  
bC0DzBnM;  
CHookApp theApp; <0!)}O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,;~@t:!c  
{ _&}z+(Ug  
 BOOL bProcessed=FALSE; <nbc RO.  
 if(HC_ACTION==nCode) Dx>~^ ^<  
 { *28:|blbL  
  if((lParam&0xc0000000)==0xc0000000){// Key up [E6ZmMB&  
   switch(wParam) A`ScAzx5{  
   { uG{/yJeU  
    case VK_MENU: HrH! 'bd  
     MaskBits&=~ALTBIT; #xfPobQ>il  
     break; &l _NCo2  
    case VK_CONTROL: dA=T+u  
     MaskBits&=~CTRLBIT; t:yJ~En]=  
     break; 9KDm<Q-mf  
    case VK_SHIFT: ;k5B@z/<S  
     MaskBits&=~SHIFTBIT; %hV]vm  
     break; YJMaIFt  
    default: //judge the key and send message R(W}..U0R"  
     break; -,^Z5N#\|  
   } $@@@</VbP  
   for(int index=0;index<MAX_KEY;index++){ -cL wjI  
    if(hCallWnd[index]==NULL) L2{b~`UvP  
     continue; r9!,cs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <) VNEy'  
    { vCsJnKqK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6<m9guv  
     bProcessed=TRUE; 08F~6e6a8  
    } I6RF;m:Jw  
   } tde&w=ec  
  } F%`O$uXA  
  else if((lParam&0xc000ffff)==1){ //Key down PIZK*Lop  
   switch(wParam) KAR **Mp+  
   { #s3R4@{  
    case VK_MENU: JYO("f  
     MaskBits|=ALTBIT; :BpXi|n;  
     break; }E&48$0h  
    case VK_CONTROL: FN"Ye*d  
     MaskBits|=CTRLBIT; #Z1 <lAy  
     break; *rv7#!].  
    case VK_SHIFT: MoMxKmI  
     MaskBits|=SHIFTBIT; WI\jm&H r  
     break; _8&a%?R@W  
    default: //judge the key and send message EVW\Z 2N.  
     break; uE-|]QQo  
   } ~U<=SyZYo  
   for(int index=0;index<MAX_KEY;index++) W:V.\  
   { j+NsNIJq  
    if(hCallWnd[index]==NULL) -mqL[ h,  
     continue; W~d^ *LZt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3fdqFJ O  
    { !]2`dp\!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9Z lfY1=  
     bProcessed=TRUE; $3yn-'o'A  
    } GyLp&aa  
   } 0q_?<v_ 1  
  } d0}P  
  if(!bProcessed){ ak$D1#hY  
   for(int index=0;index<MAX_KEY;index++){ /5"RedP<  
    if(hCallWnd[index]==NULL) NXSjN~aG2  
     continue; [J +5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) MD>xRs   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 'l6SL- <  
   } z\c$$+t  
  } VJOB+CKE  
 } gaU1A"S}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }-T :   
} CC|=$(PgT  
IZOO>-g'f  
BOOL InitHotkey() *:8,w?Nt  
{ eoxEnCU  
 if(hHook!=NULL){ 0i~?^sT'  
  nHookCount++; mG.H=iw  
  return TRUE; 2*TPW  
 } nZ8jBCh  
 else e1Bqd+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); /A1qTG=Br  
  if(hHook!=NULL) |)+45e  
   nHookCount++; Fr)6<9%xVm  
  return (hHook!=NULL); ^|ul3_'?  
} W #V`|JA  
BOOL UnInit() V*H7m'za  
{ I T gzD"d  
 if(nHookCount>1){ m\@q2l-  
  nHookCount--; .RN2os{  
  return TRUE; L&G5 kY`  
 } WuMr";2*E  
 BOOL unhooked = UnhookWindowsHookEx(hHook); `P?!2\/  
 if(unhooked==TRUE){ R/Te ;z  
  nHookCount=0; k]~|!`  
  hHook=NULL; 37 d-!  
 } + ;_0:+//  
 return unhooked; 7O<K?;I  
} OEhDRU%k  
b{a\j%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) > 8%O;3-m#  
{ U~O*9  
 BOOL bAdded=FALSE; A O3MlK9t  
 for(int index=0;index<MAX_KEY;index++){ 36\_Y?zx%  
  if(hCallWnd[index]==0){ QS%t:,0lp  
   hCallWnd[index]=hWnd; z@U5  
   HotKey[index]=cKey; UNyk, #4  
   HotKeyMask[index]=cMask; 8]&\FA8  
   bAdded=TRUE; _ pO1XM  
   KeyCount++; CSlPrx2\  
   break; $ Qcr8~+a  
  } q*7:L  
 } z, c=."<z  
 return bAdded; yQE9S+%M  
} Y Sux#*#H  
!XQ)>T^G5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *&tv(+P  
{ Mu/hTTiNx  
 BOOL bRemoved=FALSE; ]. 0;;v6)  
 for(int index=0;index<MAX_KEY;index++){ hFMT@Gy  
  if(hCallWnd[index]==hWnd){ J Mm'JK?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PZk"!I<oN  
    hCallWnd[index]=NULL; epG!V#I  
    HotKey[index]=0; lN'b"N  
    HotKeyMask[index]=0; HleMzykF  
    bRemoved=TRUE; ca,U>'(y  
    KeyCount--; S3gd'Bahq  
    break; _bSn YhS  
   } jS4 fANG  
  } J=Hyoz+9  
 } ^b6yN\,S  
 return bRemoved; *}=z^;_oq  
} !'*1;OQ  
3Uy(d,N  
void VerifyWindow() z?  Ck9  
{ 7',WLuD  
 for(int i=0;i<MAX_KEY;i++){ lf}%^od~6  
  if(hCallWnd!=NULL){ 2q ~y\fe  
   if(!IsWindow(hCallWnd)){ @6%o0p9zz  
    hCallWnd=NULL; M?QX'fia  
    HotKey=0; O6 n]l  
    HotKeyMask=0; Xd5uF/w  
    KeyCount--; M`H@ % M  
   } tC\(H=ecP  
  } !YIW8SP)  
 } H0-v^H>^  
} La r9}nx0  
SHRn $<  
BOOL CHookApp::InitInstance() WB3YN+Xl3  
{ g[(Eh?]Sc  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *Qy,?2  
 hins=AfxGetInstanceHandle(); rkn'1M&u  
 InitHotkey(); N `[ ?db-%  
 return CWinApp::InitInstance(); Y7<(_p7  
} B}^l'p_u  
,tak{["  
int CHookApp::ExitInstance() 'M,O(utGv  
{ F&a)mpFv3c  
 VerifyWindow(); /ommM  
 UnInit(); 9](RZ6A+o  
 return CWinApp::ExitInstance(); d$:LUxM#  
} 3o`c`;H%p  
4P^CqD&i  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file v0KJKrliGO  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) k1~? }+<e  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ="de+S8W  
#if _MSC_VER > 1000 F[*/D/y(  
#pragma once S#nW )=   
#endif // _MSC_VER > 1000 B!((N{4H+  
6rMNp"!  
class CCaptureDlg : public CDialog o8fY!C)  
{  }A&I@2d  
 // Construction %PC8}++  
 public: @bZ,)R  
  BOOL bTray; @|<qTci  
  BOOL bRegistered; _&aPF/  
  BOOL RegisterHotkey(); h6Cqc}P  
  UCHAR cKey; uLSuY}K0  
  UCHAR cMask; Y=Om0=v  
  void DeleteIcon(); WkDXWv\{,{  
  void AddIcon(); W^)'rH  
  UINT nCount; 6@FGt3y  
  void SaveBmp(); I-m Bj8^;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor id [caP=`  
  // Dialog Data '3fN2[(  
  //{{AFX_DATA(CCaptureDlg) ~nb1c:F  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;lf$)3%[  
  CComboBox m_Key; lPw`KW  
  BOOL m_bControl; qm< mw"]  
  BOOL m_bAlt; KO[,C[;|j  
  BOOL m_bShift; 2b&Fu\2Dmv  
  CString m_Path; HNd? '  
  CString m_Number; ;e$YM;;d  
  //}}AFX_DATA Yb4%W-5  
  // ClassWizard generated virtual function overrides vr } -u  
  //{{AFX_VIRTUAL(CCaptureDlg) t"P:}ps{?  
 public: +aN"*//i  
  virtual BOOL PreTranslateMessage(MSG* pMsg); vQy+^deW  
 protected: vsJM[$RF  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RO[6PlrRN  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); A=r8_.@2@  
  //}}AFX_VIRTUAL ;cGY  
  // Implementation >1$Vh=\OI  
 protected: yiMqe^zy  
  HICON m_hIcon; w9675D+  
  // Generated message map functions V/BU(`~i  
  //{{AFX_MSG(CCaptureDlg) pj Md  
  virtual BOOL OnInitDialog(); f<M!L> +M6  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); r9n:[A&HE  
  afx_msg void OnPaint(); -Eoq#ULvR  
  afx_msg HCURSOR OnQueryDragIcon(); L| ;WE=  
  virtual void OnCancel(); otlv ;3263  
  afx_msg void OnAbout(); .0p'G}1  
  afx_msg void OnBrowse(); Ll, U>yo  
  afx_msg void OnChange(); X'j9l4Ph7  
 //}}AFX_MSG i5SDy(?r  
 DECLARE_MESSAGE_MAP() _pxurq{  
}; l OiZ2_2  
#endif r?/!VO-*N  
OO\$'% y`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file fJ&\Z9zY  
#include "stdafx.h" CW -[c  
#include "Capture.h" M2I*_pI  
#include "CaptureDlg.h" +v< \l=  
#include <windowsx.h> cp6I]#X  
#pragma comment(lib,"hook.lib") \- 8aTF  
#ifdef _DEBUG O=oIkvg  
#define new DEBUG_NEW . f!dH  
#undef THIS_FILE sfk;c#K  
static char THIS_FILE[] = __FILE__; *!ecb1U5  
#endif ZFs xsg^r  
#define IDM_SHELL WM_USER+1 Z9eP(ip  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1Cw HGO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xqfIm%9i}  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A2SDEVU  
class CAboutDlg : public CDialog L~C:1VG5  
{ -_= m j  
 public: :QC |N@C  
  CAboutDlg(); 8vQR'<,  
  // Dialog Data a\&g;n8jA  
  //{{AFX_DATA(CAboutDlg) w-3Lw<  
  enum { IDD = IDD_ABOUTBOX }; &Tg~A9y\  
  //}}AFX_DATA ZS[Ut  
  // ClassWizard generated virtual function overrides D"exI]  
  //{{AFX_VIRTUAL(CAboutDlg) 1u"#rC>7.4  
 protected: }b]eiPWN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support T3@34}*  
  //}}AFX_VIRTUAL !|8"}ZF  
  // Implementation ;vy<!@Y;8  
 protected: J,\e@  
  //{{AFX_MSG(CAboutDlg) M0$E_*  
  //}}AFX_MSG je%D&ci$  
  DECLARE_MESSAGE_MAP() z\$(@:{A  
}; )y{:Uc\4!  
tG~[E,/`  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #Hy\l J  
{ 6 [?5hmc"w  
 //{{AFX_DATA_INIT(CAboutDlg) [&kz4_  
 //}}AFX_DATA_INIT d4p6.3  
} v-wZHkdd1  
]^,!;do  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "C?H:8W  
{ @9R78Zra  
 CDialog::DoDataExchange(pDX); [s{[ .0P]+  
 //{{AFX_DATA_MAP(CAboutDlg) 'V &Tlw|  
 //}}AFX_DATA_MAP /f drf  
} zO@>)@~  
RT${7=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ~/XDA:nfL:  
 //{{AFX_MSG_MAP(CAboutDlg) XlnSh<e  
 // No message handlers ]B$J8.{q0  
 //}}AFX_MSG_MAP lB.n5G  
END_MESSAGE_MAP() RhC|x,E  
 tq?a3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7C R6ew~  
: CDialog(CCaptureDlg::IDD, pParent) 1jO%\uR/  
{ F)v  
 //{{AFX_DATA_INIT(CCaptureDlg) .R l7,1\  
  m_bControl = FALSE; *F!1xyg  
  m_bAlt = FALSE; ,RW`9+gx  
  m_bShift = FALSE; cL][sI  
  m_Path = _T("c:\\"); %0 i)l|  
  m_Number = _T("0 picture captured."); /4@ [^}x  
  nCount=0; z:Z-2WV2o  
  bRegistered=FALSE; D c;k)z=  
  bTray=FALSE; .(3ec/i4CF  
 //}}AFX_DATA_INIT 4c[/%e:\-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Y6Ux*vhK  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Cy)N hgz  
} {e q378d  
9M5W4&  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) R_\o`v5  
{ H \'1.8g/  
 CDialog::DoDataExchange(pDX); r=~K#:66  
 //{{AFX_DATA_MAP(CCaptureDlg) E(vO^)#  
  DDX_Control(pDX, IDC_KEY, m_Key); @BG].UJo  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 1 b 86@f   
  DDX_Check(pDX, IDC_ALT, m_bAlt); aOS,%J^ ?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uB#U( jl  
  DDX_Text(pDX, IDC_PATH, m_Path); K:GEC-  
  DDX_Text(pDX, IDC_NUMBER, m_Number); k/sfak{Q  
 //}}AFX_DATA_MAP LNyrIk/1  
} tP"6H-)X&  
/V63yzoY  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) QZIzddwp  
//{{AFX_MSG_MAP(CCaptureDlg) ('AAHq/  
 ON_WM_SYSCOMMAND() HUAYtUBH  
 ON_WM_PAINT() k61mRO  
 ON_WM_QUERYDRAGICON() ZhoV,/\+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2pU'&8  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) DR,7rT{$  
 ON_BN_CLICKED(ID_CHANGE, OnChange) '#h ORQB  
//}}AFX_MSG_MAP Ga-cto1Y  
END_MESSAGE_MAP() cpALs1j:  
ch25A<O<R.  
BOOL CCaptureDlg::OnInitDialog() #9Ect@?N0  
{ V1pBKr)v  
 CDialog::OnInitDialog(); .g1x$cQ1<  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); L AH">E  
 ASSERT(IDM_ABOUTBOX < 0xF000); SOn)'!g  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Ie|5,qw E  
 if (pSysMenu != NULL) d4*SfzB  
 { ' QMcQvU  
  CString strAboutMenu; u&^KrOM@#  
  strAboutMenu.LoadString(IDS_ABOUTBOX); '&dT   
  if (!strAboutMenu.IsEmpty()) "j8)l4}  
  { ,B_c  
   pSysMenu->AppendMenu(MF_SEPARATOR); N-_APWA  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); k!}(a0h  
  } 8A.7q  
 } EmR82^_:  
 SetIcon(m_hIcon, TRUE); // Set big icon .a7RGT3]m  
 SetIcon(m_hIcon, FALSE); // Set small icon C=]<R< Xy  
 m_Key.SetCurSel(0); >TY;l3ew  
 RegisterHotkey(); _U-`/r o  
 CMenu* pMenu=GetSystemMenu(FALSE); 9} m?E<6&  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); GBT|1c'i  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ! |UX4  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); X^K^az&L  
 return TRUE; // return TRUE unless you set the focus to a control /t`\b [  
} cz{`'VN}`  
{\CWoFht>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0c`nk\vUy  
{ c)B3g.C4m  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6h2keyod  
 { V7r_Ubg@K  
  CAboutDlg dlgAbout; JJ%@m;~  
  dlgAbout.DoModal(); CbC [aVA=  
 } /e|Lw4$@S  
 else u!5q)>Wt(  
 { `[g$EXX  
  CDialog::OnSysCommand(nID, lParam); ES AX}uF  
 } 2xflRks  
} ybw\^t  
pGjwI3_K  
void CCaptureDlg::OnPaint() , ?U)mYhI  
{ NsP=l]  
 if (IsIconic()) <kPNe>-f  
 { ZTV)D  
  CPaintDC dc(this); // device context for painting t!*[nfR  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]& ckq  
  // Center icon in client rectangle lnHY?y7{  
  int cxIcon = GetSystemMetrics(SM_CXICON); peBHZJ``RX  
  int cyIcon = GetSystemMetrics(SM_CYICON); #qY gQ<TM!  
  CRect rect; PA ?2K4  
  GetClientRect(&rect); HI 1T  
  int x = (rect.Width() - cxIcon + 1) / 2; 7Q9Hk(Z9  
  int y = (rect.Height() - cyIcon + 1) / 2; OKlR`Vaty  
  // Draw the icon D 5n\h5  
  dc.DrawIcon(x, y, m_hIcon); dk nM|  
 } A,~KrRd  
 else nJ]7vj,rB  
 { boGdZ2$h4  
  CDialog::OnPaint(); |1(x2x%}D^  
 } |+W{c`KL  
} -X!<$<\y;  
;!A8A4~nu  
HCURSOR CCaptureDlg::OnQueryDragIcon() Z@Zg3AVU  
{ q+9->D(6  
 return (HCURSOR) m_hIcon; BVNJas  
} v_EgY2l(  
IDT\hTPIs  
void CCaptureDlg::OnCancel() ?'+]d;UO&  
{ cZ|*Zpk  
 if(bTray) ; F'IS/ttX  
  DeleteIcon(); gv>DOez/  
  CDialog::OnCancel(); jVd`J  
} "Gp Tmu?  
w01[oU$x=  
void CCaptureDlg::OnAbout() z+7V}aPM  
{ bE.<vF&  
 CAboutDlg dlg; Ig}hap]G  
 dlg.DoModal(); %%}l[W  
} AXHY$f|  
rHB>jN@$  
void CCaptureDlg::OnBrowse() Y3DqsZ@  
{ t!Cz;ajNi  
 CString str; x\8g ICf  
 BROWSEINFO bi; XYuX+&XW/  
 char name[MAX_PATH]; *6` ^8Y\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); jmwN1Se>  
 bi.hwndOwner=GetSafeHwnd(); tj~r>SRb+  
 bi.pszDisplayName=name; pNOE KiJ  
 bi.lpszTitle="Select folder"; ~6n|GxR.[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; PiM(QR  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); i@nRZ$K  
 if(idl==NULL) iKE&yO3  
  return; Awxm[:r>^  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); -Yse^(^"s  
 str.ReleaseBuffer(); mc%. 8i  
 m_Path=str; nUpj+F#  
 if(str.GetAt(str.GetLength()-1)!='\\') Q4-d|  
  m_Path+="\\"; 7FcZxu\  
 UpdateData(FALSE); ]pBEoktp  
} DSqA}r  
NMK$$0U  
void CCaptureDlg::SaveBmp() :JG5)H}j+  
{ `aAE4Ry?  
 CDC dc; Zt! $"N.,  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1[O cZ CS  
 CBitmap bm; DZ2gnRg  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5X)QW5A  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~ Ze!F"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); I F6$@Q  
 CDC tdc; 8|)!E`TKSV  
 tdc.CreateCompatibleDC(&dc); g $Y]{VM.J  
 CBitmap*pOld=tdc.SelectObject(&bm); d.~ns4bt9  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); G{fPQ=  
 tdc.SelectObject(pOld); ]vz6DJs  
 BITMAP btm; 8%m\J:e R  
 bm.GetBitmap(&btm); H"? 5]!p  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Yq00<kIDJ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S1^/W-yoc~  
 BITMAPINFOHEADER bih; r+ 8Tp|%  
 bih.biBitCount=btm.bmBitsPixel; Db|JR  
 bih.biClrImportant=0; WUie `p  
 bih.biClrUsed=0; DCiU?u~  
 bih.biCompression=0; sx=1pnP9`  
 bih.biHeight=btm.bmHeight; 2[`n<R\  
 bih.biPlanes=1; 'uL$j=vB  
 bih.biSize=sizeof(BITMAPINFOHEADER); yg'CL/P  
 bih.biSizeImage=size; W`9{RZ'  
 bih.biWidth=btm.bmWidth; vw!7f|Pg ~  
 bih.biXPelsPerMeter=0; "KK}} $>  
 bih.biYPelsPerMeter=0; ,H"}Rw  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1q!k#Cliu  
 static int filecount=0; 1$03:ve1  
 CString name; J' P:SC1  
 name.Format("pict%04d.bmp",filecount++); k 6[   
 name=m_Path+name; eK1l~W%  
 BITMAPFILEHEADER bfh; d^RcJ3w  
 bfh.bfReserved1=bfh.bfReserved2=0; HN NeH;L  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ? bWc<]  
 bfh.bfSize=54+size; k8}fKVU;  
 bfh.bfOffBits=54; ASoBa&vX  
 CFile bf; p1niS:}j  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ e_epuki  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ZrEou}z(*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 153*b^iDBh  
  bf.WriteHuge(lpData,size); 18%$Z$K,  
  bf.Close(); A,EG0yb  
  nCount++; 8Gy]nD  
 } @4*eH\3  
 GlobalFreePtr(lpData); vzI>:Bf  
 if(nCount==1) i=n;rT  
  m_Number.Format("%d picture captured.",nCount); liPrxuP`  
 else L@[}sMdq(  
  m_Number.Format("%d pictures captured.",nCount); V)~b+D  
  UpdateData(FALSE); Z1q<) O1QX  
} !%t@wQ]\hG  
`;}qjm0a  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) nw/g[/<;  
{ Zc_F"KJL  
 if(pMsg -> message == WM_KEYDOWN) ;q9Y%*  
 { {= &&J@:  
  if(pMsg -> wParam == VK_ESCAPE) -FZNk}  
   return TRUE; 1VFCK&  
  if(pMsg -> wParam == VK_RETURN) #]c_ 2V  
   return TRUE; F-:AT$Ok  
 } =3'B$PY  
 return CDialog::PreTranslateMessage(pMsg); 1N$OXLu  
} { /!ryOA65  
d1g7:s9$0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (G+)v[f  
{ :^?-bppYW  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ tE-bHu370  
  SaveBmp(); ]#shuZ##>0  
  return FALSE; \ky oA Z  
} jNX6Ct?  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -2}ons(  
 CMenu pop; y{(Dv}   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); j07A>G-=  
 CMenu*pMenu=pop.GetSubMenu(0); Cd^1E]O0{  
 pMenu->SetDefaultItem(ID_EXITICON); !U4YA1>>  
 CPoint pt; g/$RuT2U  
 GetCursorPos(&pt); G L0P&$h  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); aO inD  
 if(id==ID_EXITICON) r\fkx>  
  DeleteIcon(); $ZyOBxI  
 else if(id==ID_EXIT) ]Gm4gd`  
  OnCancel(); <^> nR3E  
 return FALSE; ~u0<c:C^  
} /<T{g0s  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); w]xr ~D+  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #lMIs4i.  
 AddIcon(); 8v/,< eARJ  
 return res; MX#LtCG#V  
} ZZkc) @  
DS4y@,/)'  
void CCaptureDlg::AddIcon() GKWsJO5 n  
{ +}udIi3:l  
 NOTIFYICONDATA data; T"H"m4{'  
 data.cbSize=sizeof(NOTIFYICONDATA); GE] QRKf  
 CString tip; N\]-/$z  
 tip.LoadString(IDS_ICONTIP); 3dZj<(.  
 data.hIcon=GetIcon(0); p<D@l2vt  
 data.hWnd=GetSafeHwnd(); %=K[C  
 strcpy(data.szTip,tip); "+O/OKfR0  
 data.uCallbackMessage=IDM_SHELL; _Ad63.Uq))  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; h]i vXF*  
 data.uID=98; XkUwO ]  
 Shell_NotifyIcon(NIM_ADD,&data); yZ=O+H  
 ShowWindow(SW_HIDE); \kI{#   
 bTray=TRUE; X<Xiva85  
} WaX!y$/z  
Dby|l#X  
void CCaptureDlg::DeleteIcon() dlZ2iDQ%  
{ dhP")@3K;p  
 NOTIFYICONDATA data; nZYO}bv\  
 data.cbSize=sizeof(NOTIFYICONDATA); Lf<urIF  
 data.hWnd=GetSafeHwnd(); \L?A4Qx)_  
 data.uID=98; h~%8p ]  
 Shell_NotifyIcon(NIM_DELETE,&data); #t Pc<p6m  
 ShowWindow(SW_SHOW); @[\zO'|  
 SetForegroundWindow(); 0RSzDgX  
 ShowWindow(SW_SHOWNORMAL); 3e-E/6zH6  
 bTray=FALSE; }3WP:Et  
}  Jc]k\U  
S Cn)j:gH;  
void CCaptureDlg::OnChange() NuF?:L[  
{ 7nxH>.,Q>  
 RegisterHotkey(); -e"kJd&V  
} xp^Jp  
4;32 f`  
BOOL CCaptureDlg::RegisterHotkey() Y0Tw:1a  
{ uTO%O}D N  
 UpdateData(); h c]p^/H  
 UCHAR mask=0; T_wh)B4xW  
 UCHAR key=0; )iC@n8f7o  
 if(m_bControl) m%;LJ~R  
  mask|=4; -~J5aG[@~>  
 if(m_bAlt) )B+zv,#q  
  mask|=2; #_3ZF"[zq  
 if(m_bShift) /`#JM  
  mask|=1; {ktwX\z  
  key=Key_Table[m_Key.GetCurSel()]; SuI^8^f=  
 if(bRegistered){ %)d7iT~M  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Wzff p}V  
  bRegistered=FALSE; "Il) _Ui  
 } i;qij[W.z  
 cMask=mask; u+6L>7t88I  
 cKey=key; D^s#pOZS  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); &>Z;>6J,  
 return bRegistered; [\fwnS_1  
} E}0g  
1jBIi  
  四、小结 Xyz/CZPi  
Zv mkb%8  
  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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