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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: :;q>31:h  
  KCl &H  
  一、实现方法 hc6.#~i  
@Mzz2&(d U  
  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: ^J0zXe -d  
[\88@B=jXP  
#pragma data_seg("shareddata") w/O<.8+  
HHOOK hHook =NULL; //钩子句柄 erXy>H[;  
UINT nHookCount =0; //挂接的程序数目 'HJ/2-=  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 *$JB`=Q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 t18UDR{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey v&e-`.xR  
static int KeyCount =0; %8a=mQl1^  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 T7^ulG1'  
#pragma data_seg()  YN4"O>  
z2.*#xTZn  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 `(!W s\:  
O1|B3M[P  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 'xQna+%h  
K/Sq2:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .|U4N/XN%q  
cKey,UCHAR cMask) xcw%RUC-  
{ 9^(HXH_f  
 BOOL bAdded=FALSE; IvFR <n  
 for(int index=0;index<MAX_KEY;index++){ //~POm  
  if(hCallWnd[index]==0){ 9jqO/_7R+  
   hCallWnd[index]=hWnd; 6aRGG+H  
   HotKey[index]=cKey; BSOjyy1f  
   HotKeyMask[index]=cMask; ]c5DOv&  
   bAdded=TRUE; y#&$ f  
   KeyCount++; [ k!-;mi   
   break; +O&RBEa[  
  } l_bL,-|E8  
 } ]NbX`'  
 return bAdded; L7s>su|c(  
} r >E\Cco  
//删除热键 hx*HY%\P  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7[4_+Q:}  
{ ^GE^Q\&D&  
 BOOL bRemoved=FALSE; =d}gv6v2S  
 for(int index=0;index<MAX_KEY;index++){ ^WmGo]<B_  
  if(hCallWnd[index]==hWnd){ \5t`p67Ve_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ESn6D@"  
    hCallWnd[index]=NULL; D&4u63^  
    HotKey[index]=0; D~5yj&&T;  
    HotKeyMask[index]=0; s Ke,  
    bRemoved=TRUE; ? 7/W>  
    KeyCount--; 3fm;r5  
    break; '`9%'f)  
   } aB=vu=hF  
  } U)u\1AV5  
 } YR?3 61FK  
 return bRemoved; $K+4C0wX`  
} h U 9\y  
}Q!h ov  
Q^*G`&w,  
  DLL中的钩子函数如下: 3w t:5 Im  
umZlIH[7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g8LT7  
{ di"C]" ;  
 BOOL bProcessed=FALSE; N-X VRuv  
 if(HC_ACTION==nCode) s.VUd R"  
 { r hiS  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i:V0fBR[>  
   switch(wParam) m5X3{[a :  
   {  l#X=]xQf  
    case VK_MENU: J"/ JRn  
     MaskBits&=~ALTBIT; 5dg-d\ 6S  
     break; |P^]@om  
    case VK_CONTROL: '.]e._T  
     MaskBits&=~CTRLBIT; 7vi i9Am7  
     break; h9w@oRp`~  
    case VK_SHIFT: _=o1?R  
     MaskBits&=~SHIFTBIT; uo]Hi^r.l  
     break; S9 $o  
    default: //judge the key and send message 30A`\+^f  
     break; #S@UTJa  
   }  QpdujtH`  
   for(int index=0;index<MAX_KEY;index++){ bc `UA  
    if(hCallWnd[index]==NULL) 0|.7Kz^  
     continue; C<r(-qO{5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *eHA: A_I  
    { J ZVr&KZN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); C$$"{FfgU"  
     bProcessed=TRUE; q :TZ=bs^  
    } fn1 ?Qp|  
   } T r SN00  
  } 8|w5QvCU?3  
  else if((lParam&0xc000ffff)==1){ //有键按下 ZmEG<T05  
   switch(wParam) xP8iz?6"V  
   { (:_%kmu  
    case VK_MENU: M3DxapG  
     MaskBits|=ALTBIT; l4iuu  
     break; W2}%zux  
    case VK_CONTROL: aEcktg6h  
     MaskBits|=CTRLBIT; i!CKA}",  
     break; &_< VZS  
    case VK_SHIFT: B0-4 ZT  
     MaskBits|=SHIFTBIT; ."~7 \E> t  
     break; lAdOC5+JX  
    default: //judge the key and send message t7{L[C$  
     break; RnMBGxa  
   } DCEvr"(  
   for(int index=0;index<MAX_KEY;index++){ ]NaMZ  
    if(hCallWnd[index]==NULL) 2(c<U6#C'l  
     continue; 4a(g<5wfI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JK@izI  
    { ?D RFsA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [ea6dv4p  
     bProcessed=TRUE; *]{9K  
    } mr:kn0  
   } ^/_\etV  
  } M[:O(  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }ZEfT]  
   for(int index=0;index<MAX_KEY;index++){ w o-O_uZB  
    if(hCallWnd[index]==NULL) #2_o[/&}x@  
     continue; 2x)0?N[$O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,H.(\p_N  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >$7wA9YhL  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 -D!#W%y8  
   } J>HLQP  
  } .yctE:n  
 } ^/`#9]<%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); PphR4 sIM  
} j[$B\H  
>uBV  
  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: o7_MMeQ4  
J{nyo1A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Nb^zkg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Rz<d%C;R  
A2g"=x[1@K  
  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: }XfS#Xr1aV  
o9U0kI=W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5]4<!m  
{ s`8M%ZLu  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) OYqYI!N/  
 { L Q I: ]d  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ) xfc-Q  
  SaveBmp(); TEaD-mY3  
  return FALSE; -4*'WzWr  
 } s=^r/Sz902  
 …… //其它处理及默认处理 z;fd#N:  
} l }2%?d  
%\(y8QV  
*_4n2<W$  
  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。 `nd#< w>  
p|bc=`TD  
  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。 ,<uiitOo  
Pe+ 8~0o=R  
  二、编程步骤 U/1[~429  
mV:RmA  
  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"; Q|j@#@O1  
br34Eh  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; [a>JG8[ ,t  
Uy$U8b-ov  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; M `9orq<  
^*cMry  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 3<zTkI  
wzHjEW  
  5、 添加代码,编译运行程序。 :/yr(V{  
[6,]9|~  
三、程序代码 \p>]G[g  
[#hl}q(P#  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4pfix1F g  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) rj2r#{[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ LH3N}J({  
#if _MSC_VER > 1000 }%o+1 <=  
#pragma once  qrkRD*a  
#endif // _MSC_VER > 1000 9I`Mm}v@  
#ifndef __AFXWIN_H__ in=k:j,U0  
#error include 'stdafx.h' before including this file for PCH Ac5o K  
#endif O?j98H Sya  
#include "resource.h" // main symbols &J6o$i  
class CHookApp : public CWinApp m' Ekp  
{ L#7)X5a__  
 public: [x$eF~Kp  
  CHookApp(); |g?/~%7  
  // Overrides O, ``\(P  
  // ClassWizard generated virtual function overrides )5GdvqA  
  //{{AFX_VIRTUAL(CHookApp) 4,w{rmj  
 public: h 0QYoDvbC  
  virtual BOOL InitInstance(); ctc`^#q  
  virtual int ExitInstance(); i">z8?qF  
  //}}AFX_VIRTUAL hVT=j ?~  
  //{{AFX_MSG(CHookApp) DSDl[;3O{s  
  // NOTE - the ClassWizard will add and remove member functions here. -~<q,p"e  
  // DO NOT EDIT what you see in these blocks of generated code ! :]u}x Dv3  
  //}}AFX_MSG Ry8WNVO}R  
  DECLARE_MESSAGE_MAP() 7/^TwNsv  
}; ,IT)zCpaBP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); +c]N]?k&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9?g]qy,1)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (:fE _H2z  
BOOL InitHotkey();  z~}StCH(  
BOOL UnInit(); 7+D'W7Yx  
#endif 9h3~;Q  
P[#WHbn  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. qOcG|UgF  
#include "stdafx.h" 86^ZYh  
#include "hook.h" ]df9'\  
#include <windowsx.h> NDIc?kj~  
#ifdef _DEBUG ld!6|~0U  
#define new DEBUG_NEW O)U$Ef  
#undef THIS_FILE ~7ATt8T  
static char THIS_FILE[] = __FILE__; uwH)/BW)[  
#endif w}U5dM`  
#define MAX_KEY 100 (AM,4)lW,  
#define CTRLBIT 0x04 I*vj26qvg  
#define ALTBIT 0x02 (}~eD  
#define SHIFTBIT 0x01 wCq)w=,  
#pragma data_seg("shareddata") nIT^'  
HHOOK hHook =NULL; 7>#L  
UINT nHookCount =0; ~G{$P'[  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey bn*{*=(|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT px [1#*  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #>=/15:  
static int KeyCount =0; {M)3GsP?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift +}(B856+  
#pragma data_seg() $^NWzc  
HINSTANCE hins; Ghq'k:K,  
void VerifyWindow(); 2=Y_Qrhi  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \6`%NhkM_  
//{{AFX_MSG_MAP(CHookApp) ?2<6#>(7a  
// NOTE - the ClassWizard will add and remove mapping macros here. Ltic_cjYd?  
// DO NOT EDIT what you see in these blocks of generated code! Ghgv RR$  
//}}AFX_MSG_MAP St7D.|  
END_MESSAGE_MAP() 1)/T.q<D"  
c>U{,z  
CHookApp::CHookApp() G7_"^r%c9;  
{ wWOT*R_  
 // TODO: add construction code here, z W" 3K  
 // Place all significant initialization in InitInstance MR)KLM0  
} *v:,rh  
QzFv;  
CHookApp theApp; &Xl_sDvt  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /_k hFw  
{ ,],JI|Rl8c  
 BOOL bProcessed=FALSE; UwL"%0u  
 if(HC_ACTION==nCode) jzJ1+/9  
 { ]!tYrSM!  
  if((lParam&0xc0000000)==0xc0000000){// Key up y9G57D  
   switch(wParam) 3ciVjH>i  
   { 7ck0S+N'b  
    case VK_MENU: p=`x  
     MaskBits&=~ALTBIT; hml\^I8Q>F  
     break; $MJDB  
    case VK_CONTROL: Y3MR:{}  
     MaskBits&=~CTRLBIT; k,NU,^ &  
     break; C(t6;&H  
    case VK_SHIFT: tFST.yT>zg  
     MaskBits&=~SHIFTBIT; bJ,=yB+0  
     break; eZ.0,A*1B1  
    default: //judge the key and send message {ZsWZJ!  
     break; 8F\Msx  
   } 3R=3\;  
   for(int index=0;index<MAX_KEY;index++){ 3Ibt'$dK  
    if(hCallWnd[index]==NULL) _[OEE<(  
     continue; ZvnZ}t >?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) VrGb;L'[  
    { %`\3V {2*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /"%IhX-  
     bProcessed=TRUE; PcSoG\- G<  
    } dpGQ0EzH^  
   } P!6e  
  } E=1/  
  else if((lParam&0xc000ffff)==1){ //Key down Q!+{MsZ  
   switch(wParam) ,?~UpsUx  
   { ,md7.z]U~  
    case VK_MENU: q/2K=BOh  
     MaskBits|=ALTBIT; #L4Kwy  
     break; SiuO99'nV  
    case VK_CONTROL: norc!?L  
     MaskBits|=CTRLBIT; -Ib+/'  
     break;  +SA<0l  
    case VK_SHIFT: w6In{uO-Z  
     MaskBits|=SHIFTBIT; nhX p_Z9  
     break; `1d`9AS2g  
    default: //judge the key and send message /qhm9~4e3  
     break; UVBw;V  
   } W$MEbf%1  
   for(int index=0;index<MAX_KEY;index++) iQ}sp64  
   { U`nS` p  
    if(hCallWnd[index]==NULL) |e-+xX|;  
     continue; <# x%A0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uuK]<h*  
    { d>"$^${  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X @jYQ.  
     bProcessed=TRUE; K^qUlyv  
    } Oi%~8J>  
   } @~U6=(+  
  } |8U7C\S[  
  if(!bProcessed){ Hv7D+ j8M  
   for(int index=0;index<MAX_KEY;index++){ h,6S$,UI  
    if(hCallWnd[index]==NULL) .' 2gJ"?,  
     continue; dR, NC-*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZNC?Ntw  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); e}O-I  
   } NF\^'W@N  
  } UE`4$^qs  
 } $*)(8Cl  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 10I`AjF0  
} U;Y}2  
aj'8;E+  
BOOL InitHotkey() }L7F g%,  
{ h`;F<PFW  
 if(hHook!=NULL){ yJ`1},^  
  nHookCount++; ]-Y]Q%A4  
  return TRUE; Rb}&c)4  
 } ^`r|3c0  
 else  H[!Q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); f, j(uP  
  if(hHook!=NULL) u-M$45vct  
   nHookCount++; rKs WS~U  
  return (hHook!=NULL); ?O>JtEz~lQ  
} U W)&Eky  
BOOL UnInit() FjLv*K[#d  
{ . N} }cJq  
 if(nHookCount>1){ {f-/,g~  
  nHookCount--; % m5^p  
  return TRUE; jc~*#\N  
 } K2o0L5Lke  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -[7,ph  
 if(unhooked==TRUE){ %TTL^@1!b  
  nHookCount=0; {*Wwu f.  
  hHook=NULL; )I-?zyL  
 } iXS-EB/  
 return unhooked; hsVJ&-#  
} Sq8Q *  
rbZ6V :  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OO+#KyU   
{ v4a4*rBI"  
 BOOL bAdded=FALSE; U <$xp  
 for(int index=0;index<MAX_KEY;index++){ !#gE'(J;c  
  if(hCallWnd[index]==0){ -%gd')@SfD  
   hCallWnd[index]=hWnd; nC{rs+P  
   HotKey[index]=cKey; M "P  
   HotKeyMask[index]=cMask; QOy&!6  
   bAdded=TRUE; z.Kq}r^  
   KeyCount++; wp GnS  
   break; Rf0\CEc  
  } JEF7hJz~  
 } YM* 6W?  
 return bAdded; '2J6%Gg  
} svRaU7<UDN  
R$&&kmJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |laKntv2  
{ MkGq%AE`Y  
 BOOL bRemoved=FALSE; V42*4hskL  
 for(int index=0;index<MAX_KEY;index++){ 3$yL+%i  
  if(hCallWnd[index]==hWnd){ @`8 B} C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 18tQWI$  
    hCallWnd[index]=NULL; A;`U{7IST  
    HotKey[index]=0; ?BvI/H5d  
    HotKeyMask[index]=0; j!o3g;j  
    bRemoved=TRUE; "LIii1]k  
    KeyCount--; (BQ3M-  
    break; s /q5o@b{  
   } s@[t5R  
  } U7%pOpO!  
 } 4S EC4yO  
 return bRemoved; GaqG 8% .  
} D#[ :NXahn  
(E(:F[.S  
void VerifyWindow() j/mp.'P1k  
{ FY}*Z=D%  
 for(int i=0;i<MAX_KEY;i++){ yB{o_1tc  
  if(hCallWnd!=NULL){ tskODM0Zf  
   if(!IsWindow(hCallWnd)){ &b")`p&K  
    hCallWnd=NULL; @,`=~_J  
    HotKey=0; n}'.6  
    HotKeyMask=0; ]hVXFHrR  
    KeyCount--; ;/3/R/^g  
   } gO myFHv.  
  } I>o; %}  
 } |(v=1#i  
} v4~Xv5|w^F  
XJ/ kB8  
BOOL CHookApp::InitInstance() rw0lXs#K<E  
{ aDv/kFfn  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); -mw \?\2{  
 hins=AfxGetInstanceHandle(); q &6=oss!  
 InitHotkey(); ?,DbV|3 _\  
 return CWinApp::InitInstance(); oYErG] ,  
} Xq!tXJ)  
Cwf$`?|W  
int CHookApp::ExitInstance() 24/~gft  
{ 6="&K_Q7  
 VerifyWindow(); .p~;U|h"  
 UnInit(); Vy~$%H94  
 return CWinApp::ExitInstance(); fQ4$@  
} q=i<vcw  
LK/V]YG  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file n$Fm~iPo,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) H{zuIN/.1  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ W2Z]?l;vQQ  
#if _MSC_VER > 1000 0BE^qe  
#pragma once ByvqwJY  
#endif // _MSC_VER > 1000 Y[?Wt/O;  
arL&^]JnZ,  
class CCaptureDlg : public CDialog G6VHl:e7z  
{ 8%f! X51  
 // Construction U(LR('-h  
 public: |L{dQ)-'l  
  BOOL bTray; =e{KtX.  
  BOOL bRegistered; &'\+Z  
  BOOL RegisterHotkey(); gt(nZ  
  UCHAR cKey; gF5EtdN?|  
  UCHAR cMask; V46[whL%r  
  void DeleteIcon(); &7u Ra1/R  
  void AddIcon(); # h|< >  
  UINT nCount; \9zC?Cw  
  void SaveBmp(); BF|FW  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor OBQ!0NM_b  
  // Dialog Data {;M/J  
  //{{AFX_DATA(CCaptureDlg) iPpJ`i#@+  
  enum { IDD = IDD_CAPTURE_DIALOG }; _cN)q  
  CComboBox m_Key; v("vUqhx2+  
  BOOL m_bControl; }AYSQ~:  
  BOOL m_bAlt; 7Q}@L1A9F,  
  BOOL m_bShift; F|{?GV%hF  
  CString m_Path; 5B/\vLHg4  
  CString m_Number; FY*0gp  
  //}}AFX_DATA Jo+C!kc  
  // ClassWizard generated virtual function overrides # |[@Due  
  //{{AFX_VIRTUAL(CCaptureDlg) <qt%MM [Y  
 public: )pa|uH +N  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1*b%C"C  
 protected: O G}&%NgH  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Vs"Q-?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %y+j~]^:  
  //}}AFX_VIRTUAL C YKGf1;If  
  // Implementation #eyx  
 protected: ITUl -L4xE  
  HICON m_hIcon; 7gaC)j&  
  // Generated message map functions M'7x:Uw;  
  //{{AFX_MSG(CCaptureDlg) )!72^rl  
  virtual BOOL OnInitDialog(); dsuW4 ^ l  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); s>I}-=.(Q  
  afx_msg void OnPaint(); =ab}.dWC  
  afx_msg HCURSOR OnQueryDragIcon(); b"bj|qF~E  
  virtual void OnCancel(); k]5L\]>y  
  afx_msg void OnAbout(); sH: &OaA  
  afx_msg void OnBrowse(); Ve) :I  
  afx_msg void OnChange(); h(sKGCG  
 //}}AFX_MSG i.4[]f[/h  
 DECLARE_MESSAGE_MAP() R~-q! nC  
}; =@l5He.]&  
#endif J<@]7)|U  
CFxs`C^  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >i E  
#include "stdafx.h" \vQ (  
#include "Capture.h" n//a;m  
#include "CaptureDlg.h" r:-WfDz.  
#include <windowsx.h> Z3{Qtysuv3  
#pragma comment(lib,"hook.lib") 5UyK1e))  
#ifdef _DEBUG xGL"N1  
#define new DEBUG_NEW t$iU|^'uV  
#undef THIS_FILE D40VJ3TUc  
static char THIS_FILE[] = __FILE__; MWf%Lh;R  
#endif b1!%xdy_T  
#define IDM_SHELL WM_USER+1 R!CUR~F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &pl;U\dc*a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UU`qI}Ys8F  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]F! h~>  
class CAboutDlg : public CDialog A???s,F_  
{ 6j#5Ag:  
 public:  I9 m  
  CAboutDlg(); q1Mk_(4oJ  
  // Dialog Data i%w'Cs0y  
  //{{AFX_DATA(CAboutDlg) %SXqJW^:  
  enum { IDD = IDD_ABOUTBOX }; r; !us~  
  //}}AFX_DATA ElxbHQj6  
  // ClassWizard generated virtual function overrides 8~&v\GDkF  
  //{{AFX_VIRTUAL(CAboutDlg) Xw)+5+t"{  
 protected: s]OXB {M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0@;E8^pa  
  //}}AFX_VIRTUAL IRB;Q(Z   
  // Implementation ?zqXHv#x  
 protected: Gr?gHAT  
  //{{AFX_MSG(CAboutDlg) P6rL;_~e  
  //}}AFX_MSG S)?B  I  
  DECLARE_MESSAGE_MAP() m`aUz}Y>c  
}; p9J(,}  
l[Oxf|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) X3vrD{uNU  
{ `h#JDcT;a  
 //{{AFX_DATA_INIT(CAboutDlg)  .~']gih#  
 //}}AFX_DATA_INIT 2e &Zs%u  
} nor`w,2VF  
GEgf_C!%@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) yMxS'j1  
{ i8F~$6C  
 CDialog::DoDataExchange(pDX); ?jnEHn  
 //{{AFX_DATA_MAP(CAboutDlg) x g@;d  
 //}}AFX_DATA_MAP .w&Z=YM  
} ?##GY;#  
^m\n[<x^  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) O"GzeEY7  
 //{{AFX_MSG_MAP(CAboutDlg) 8~7EWl  
 // No message handlers X.Kxio $o  
 //}}AFX_MSG_MAP w*0T"hK  
END_MESSAGE_MAP() U*t `hn-xs  
f,*e?9@;s  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :tMWy m  
: CDialog(CCaptureDlg::IDD, pParent) ;Lx5r=<Hx  
{ ;F5%X\ t-  
 //{{AFX_DATA_INIT(CCaptureDlg) 6}0#({s:R  
  m_bControl = FALSE; WqAP'x 1  
  m_bAlt = FALSE; SBA;p7^"  
  m_bShift = FALSE; E#OKeMK  
  m_Path = _T("c:\\"); Z1zC@z4sUj  
  m_Number = _T("0 picture captured."); I| hG"i  
  nCount=0; }T6jQ:?@  
  bRegistered=FALSE; BDA\9m^3  
  bTray=FALSE; ?*g]27f11  
 //}}AFX_DATA_INIT 2C>PxA6l  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 F-t-d1w6  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~ lS3+H  
} M II]sF  
zKZ6Qjd8!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s_|wvOW)'  
{ 4YJs4CB  
 CDialog::DoDataExchange(pDX); LQ._?35r  
 //{{AFX_DATA_MAP(CCaptureDlg) );C !:?  
  DDX_Control(pDX, IDC_KEY, m_Key); ;J<kG@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); : &]%E/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); : f Wh7X3  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); f3O3pIA  
  DDX_Text(pDX, IDC_PATH, m_Path); K>-m8.~\E  
  DDX_Text(pDX, IDC_NUMBER, m_Number); J_tJj8  
 //}}AFX_DATA_MAP >13=4S  
} }  ?  
:98Pe6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) > 2$M~to"1  
//{{AFX_MSG_MAP(CCaptureDlg) _\"?:~rUN  
 ON_WM_SYSCOMMAND() OT zh=Z^r  
 ON_WM_PAINT() #Ew}@t9  
 ON_WM_QUERYDRAGICON() /[mCK3_  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Q8O38uZ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6sntwT"?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) [@(zGb8  
//}}AFX_MSG_MAP |h;MA,qva  
END_MESSAGE_MAP() 7G xNI  
b]Jh0B~Y  
BOOL CCaptureDlg::OnInitDialog() YVzK$k'3U  
{ -?ip?[Z  
 CDialog::OnInitDialog(); 5p750`n  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); dW91nTQ:  
 ASSERT(IDM_ABOUTBOX < 0xF000); [KJm&\evp  
 CMenu* pSysMenu = GetSystemMenu(FALSE); V9+7A  
 if (pSysMenu != NULL) >q}EZC  
 { Z#0z#M`  
  CString strAboutMenu; 15870xS  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  ^rI&BN@S  
  if (!strAboutMenu.IsEmpty()) 9yQ[*  
  { C>LkU|[  
   pSysMenu->AppendMenu(MF_SEPARATOR); \Ew2@dF{O  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0tA+11Iu  
  } B^oXUEOImq  
 } 4aGHks8Z,\  
 SetIcon(m_hIcon, TRUE); // Set big icon #fwG~Q(  
 SetIcon(m_hIcon, FALSE); // Set small icon c=7L)w:I  
 m_Key.SetCurSel(0); yjr!8L:m  
 RegisterHotkey(); _3`{wzMA  
 CMenu* pMenu=GetSystemMenu(FALSE); b2z~C{l  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &u8BGMl2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <yeG0`}t  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); :R _(+EK1  
 return TRUE; // return TRUE unless you set the focus to a control pNDL:vMWP  
} upWq=_  
 B} :[~R'  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \!-X&ws  
{ 4Vt YR  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) mI l_ [  
 { yfq"atj  
  CAboutDlg dlgAbout; 0L|A  
  dlgAbout.DoModal(); >Z/,DIn,I  
 } hhwV)Z  
 else d6_ CsqV  
 { F3+)bIz  
  CDialog::OnSysCommand(nID, lParam); n U/v(lN  
 } ~$+9L2gz  
} K2!KMhvQ  
"8s0~ [6S  
void CCaptureDlg::OnPaint() *.20YruU;j  
{ -O{Af  
 if (IsIconic()) =3sBWDB[  
 { &K}!R$[,:P  
  CPaintDC dc(this); // device context for painting 2mI=V.X[&  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9c<lFZb;  
  // Center icon in client rectangle z"R-Sme  
  int cxIcon = GetSystemMetrics(SM_CXICON); q[r|p"TGov  
  int cyIcon = GetSystemMetrics(SM_CYICON); 5pz%DhjLo  
  CRect rect; 4e9mN~  
  GetClientRect(&rect); @HR]b^2E  
  int x = (rect.Width() - cxIcon + 1) / 2; \4mw>8wA  
  int y = (rect.Height() - cyIcon + 1) / 2; sz_|py?0  
  // Draw the icon `_<K#AGAi  
  dc.DrawIcon(x, y, m_hIcon); V\Rbnvq  
 } >0{{ loqq  
 else " GgK,d}%  
 { $/6.4" j  
  CDialog::OnPaint(); n pBpYtG  
 } dqnxhN+&  
} 'a*tee ^RS  
?DA,]aa-  
HCURSOR CCaptureDlg::OnQueryDragIcon() @2]_jW  
{  z>hA1*Ti  
 return (HCURSOR) m_hIcon;  |G{TA  
} kE=}.  
^b'|`R+~}  
void CCaptureDlg::OnCancel() G!@tW`HO  
{ GYZzWN}U  
 if(bTray) (@~d9PvB>  
  DeleteIcon(); !XQG1!|ww  
  CDialog::OnCancel(); MJb!+E+  
} Uk5jZ|  
)9,9yd~SI  
void CCaptureDlg::OnAbout() GAV|x]R  
{ /`3< @{D  
 CAboutDlg dlg; j $a,93P5  
 dlg.DoModal(); q B5cF_  
} ZEp UHdin  
,i e84o  
void CCaptureDlg::OnBrowse() 7 i,}F|#8  
{ sd xl@  
 CString str; IZoa7S&t  
 BROWSEINFO bi; \5cAOBja  
 char name[MAX_PATH]; ._Wm%'uX  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); XX#YiG4|J  
 bi.hwndOwner=GetSafeHwnd(); '3 5w(  
 bi.pszDisplayName=name; Jn-iIl  
 bi.lpszTitle="Select folder"; I HgYgn  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 5Jlz$]f  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); tUH#%  
 if(idl==NULL) Y]Td+ Zi  
  return; +2 !F6"hP  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Tt<Ry'Z$3  
 str.ReleaseBuffer(); :VX?j 3qW  
 m_Path=str; QD-#sU]  
 if(str.GetAt(str.GetLength()-1)!='\\') ({87311%  
  m_Path+="\\"; 7FMO' 'x  
 UpdateData(FALSE); aHvTbpJ  
} d#T~xGqz  
KpA iKe  
void CCaptureDlg::SaveBmp() 7g[T#B'/x,  
{ F_$eu-y  
 CDC dc; MPhO#;v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); dUyit-  
 CBitmap bm; q ;1]M[&  
 int Width=GetSystemMetrics(SM_CXSCREEN); y".uu+hL`  
 int Height=GetSystemMetrics(SM_CYSCREEN); l 2y_Nz-;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Zqc+PO3lw  
 CDC tdc; T}jryN;J5  
 tdc.CreateCompatibleDC(&dc); JL=MlZ  
 CBitmap*pOld=tdc.SelectObject(&bm); k.NgE/;3  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); J*IC&jH:  
 tdc.SelectObject(pOld); VnAJOR7lrx  
 BITMAP btm; tT>~;l%'  
 bm.GetBitmap(&btm); 8&\<p7}=h  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; l1 fP@|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `D6Bw=7  
 BITMAPINFOHEADER bih; 3@f@4t@5V  
 bih.biBitCount=btm.bmBitsPixel; m_wBRan  
 bih.biClrImportant=0; dq?{?~3  
 bih.biClrUsed=0; T.]+T[}!  
 bih.biCompression=0; #p_3j 0S  
 bih.biHeight=btm.bmHeight; 4{7O}f  
 bih.biPlanes=1; Pfj{TT.#L  
 bih.biSize=sizeof(BITMAPINFOHEADER); ~&8ag`  
 bih.biSizeImage=size; M#c.(QdF  
 bih.biWidth=btm.bmWidth; x >hnH{~w  
 bih.biXPelsPerMeter=0; e p* (  
 bih.biYPelsPerMeter=0; r~N0P|Tq  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <05\  
 static int filecount=0; ^NKB  
 CString name; *_ {w0U)  
 name.Format("pict%04d.bmp",filecount++); tG+ E'OP  
 name=m_Path+name; )o-rg  
 BITMAPFILEHEADER bfh; HdQd =q(  
 bfh.bfReserved1=bfh.bfReserved2=0; ~_OtbNj#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); zZE 2%fqM  
 bfh.bfSize=54+size; !)FM/Xj,o  
 bfh.bfOffBits=54; 8p p^ w  
 CFile bf; 4RTuy+ M  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ A8Tq2]"* S  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Ju4={^#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Lwm2:_\_b  
  bf.WriteHuge(lpData,size); cPZD#";f  
  bf.Close(); Rrm k\7/  
  nCount++; $)t ]av  
 } {p@uH<)  
 GlobalFreePtr(lpData); P]hS0,sE<(  
 if(nCount==1) &>y[5#qOl  
  m_Number.Format("%d picture captured.",nCount); >jMq-#*4  
 else k\rzvo=U  
  m_Number.Format("%d pictures captured.",nCount); Rl@k~;VV  
  UpdateData(FALSE); xrd@GTaI  
} {W*_^>;K  
H.cN(7LXm  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xO"fg9a  
{ gI a/sD2m>  
 if(pMsg -> message == WM_KEYDOWN) ?$ T! =e"  
 { s=9gp$9m  
  if(pMsg -> wParam == VK_ESCAPE) -F\xZ  
   return TRUE; `&]<_Jc1  
  if(pMsg -> wParam == VK_RETURN) 'S]7:/CI  
   return TRUE; mv_N ns  
 } '_!j9A]g  
 return CDialog::PreTranslateMessage(pMsg); GAG=4 g  
} QwPL y O  
.4DX/~F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) DdJ>1504  
{ B@XnHh5y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ocOzQ13@Y  
  SaveBmp(); =>Ss:SGjT  
  return FALSE; Jv(9w[  
} Ln-/ 9'^  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~H"Q5Hr   
 CMenu pop; m!{Xuy  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,[fn? s r  
 CMenu*pMenu=pop.GetSubMenu(0); Nb;xJSlox  
 pMenu->SetDefaultItem(ID_EXITICON); [gI;;GW  
 CPoint pt; ClZ:#uMbN  
 GetCursorPos(&pt); 0Yk@O) x  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); k1Cx~Q)XC  
 if(id==ID_EXITICON) H 6 i4>U*  
  DeleteIcon(); it V@U  
 else if(id==ID_EXIT) jzCSxuZ7O  
  OnCancel(); 2 |lm'Hf  
 return FALSE; U,Py+c6  
} ;o* n*N  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); GPP{"6q5'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) mRVE@ pc2X  
 AddIcon(); XwWp4`Fd  
 return res; &s m7R i  
} HRP4"#9R  
.PjJ g^^  
void CCaptureDlg::AddIcon() |KEq-  
{ ?M?S+@(  
 NOTIFYICONDATA data; *j9{+yO{ZE  
 data.cbSize=sizeof(NOTIFYICONDATA); FgA'X<  
 CString tip; )c~1s  
 tip.LoadString(IDS_ICONTIP); <k'JhMwN  
 data.hIcon=GetIcon(0); RW19I,d  
 data.hWnd=GetSafeHwnd(); R1$O)A}k  
 strcpy(data.szTip,tip); ;e~Z:;AR  
 data.uCallbackMessage=IDM_SHELL; VK)1/b=yT  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; UykOQ-2-n  
 data.uID=98; 2ZHeOKJ-  
 Shell_NotifyIcon(NIM_ADD,&data); oS3}xT" U  
 ShowWindow(SW_HIDE); \Y;LbB8D  
 bTray=TRUE; ND);7  
} Np$peT[  
*6uZ"4rb.  
void CCaptureDlg::DeleteIcon() R7axm<PR=  
{ =fA* b  
 NOTIFYICONDATA data; MLD-uI10{  
 data.cbSize=sizeof(NOTIFYICONDATA); `U:W(\L  
 data.hWnd=GetSafeHwnd(); "XQj ~L  
 data.uID=98; }<?1\k  
 Shell_NotifyIcon(NIM_DELETE,&data); 9nW/pv  
 ShowWindow(SW_SHOW); 1e=<df  
 SetForegroundWindow(); xDtq@Rb}  
 ShowWindow(SW_SHOWNORMAL); =apcMW(zn  
 bTray=FALSE; #H]b Xr  
} g )H>Uu5@  
pPr/r& r  
void CCaptureDlg::OnChange() rHhn)m  
{ ] Tc!=SV  
 RegisterHotkey(); H"v3?g`S%  
} |0!oSNJ  
7)Zk:53]  
BOOL CCaptureDlg::RegisterHotkey() 43_;Z| T  
{ j TVh`d< N  
 UpdateData(); :|%dV}j  
 UCHAR mask=0; BN!N_r  
 UCHAR key=0; )Rhy^<xH  
 if(m_bControl) E+XpgR5  
  mask|=4; 8)I,WWj  
 if(m_bAlt) UuDT=_1Sh  
  mask|=2; m(Hb! RT  
 if(m_bShift) ~`J/618  
  mask|=1; dOm`p W^  
  key=Key_Table[m_Key.GetCurSel()]; Z.9 ?u;  
 if(bRegistered){ aDJ\%  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); lgR;V]^YX  
  bRegistered=FALSE; B^4D`0G[4  
 } Yt^<^l77D  
 cMask=mask; ym*,X@Qg^  
 cKey=key; (#zSVtZ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Rx';P/F0C  
 return bRegistered; R7'a/  
} Vp3r  
|Ld/{&Qr  
  四、小结 vfb~S~|U6g  
z}XmRc_Ko  
  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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