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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: ?Sj >b   
  #S4lRVt5  
  一、实现方法 lq'MLg  
(8Ptuh6\\2  
  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: \-`,fat  
mG\$W#+j  
#pragma data_seg("shareddata") u2 a#qU5*  
HHOOK hHook =NULL; //钩子句柄 V vFMpPi  
UINT nHookCount =0; //挂接的程序数目 ahoXQ8c:\}  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5 *R{N ~>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 'zo] f  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey MrU0Jrk4+  
static int KeyCount =0; |&49YQ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ,h<xL-  
#pragma data_seg() kN~:Bh$  
d}:eLC  
  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。 <6rc 8jYz  
' pN[H\Ia  
  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: I5%#A/|z  
4 AWL::FU5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  Q4R*yRk  
cKey,UCHAR cMask) d!P3<:+R[  
{ 7ciSIJ  
 BOOL bAdded=FALSE; iZ( U]  
 for(int index=0;index<MAX_KEY;index++){  Gv(?u  
  if(hCallWnd[index]==0){ P Y&(ObC  
   hCallWnd[index]=hWnd; >.=v*\P  
   HotKey[index]=cKey; o)]mJb~XG-  
   HotKeyMask[index]=cMask; U0J_ 3W  
   bAdded=TRUE; 1OI/,y8}  
   KeyCount++; G(;hJ'LT  
   break; ^!v{ >3  
  } ,wYA_1$$H  
 } Q1[3C(  
 return bAdded; qP k`e}D  
} ASU.VY  
//删除热键 ou\M}C`E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ud grZ/w]  
{ \?_M_5Nb  
 BOOL bRemoved=FALSE; QWQJSz5  
 for(int index=0;index<MAX_KEY;index++){ umo<9Y  
  if(hCallWnd[index]==hWnd){ eYQPK?jo  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7cQFH@SC  
    hCallWnd[index]=NULL; [C^&iLX/F*  
    HotKey[index]=0; % |^V)  
    HotKeyMask[index]=0; pf8M0,AY  
    bRemoved=TRUE; .+ d.~jHX  
    KeyCount--; E#zLm  
    break; k}&7!G@T  
   } 4 \Ig<C9  
  } q]2t3aY%  
 } p6c&vEsNj  
 return bRemoved; 1DR ih>+#  
} Kt5k_9  
, G2( l  
/$'|`jKsB  
  DLL中的钩子函数如下: M 8NWQ^Y  
4.e0k<]N`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %y|L'C,ge"  
{ MLT ^7'y  
 BOOL bProcessed=FALSE; UP .4#1I  
 if(HC_ACTION==nCode) X#Sgf|$  
 { 0&$,?CL?  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 I83 _x|$FZ  
   switch(wParam) 5< $8.a#  
   {  r oM!%hb  
    case VK_MENU: 93VbB[w~7F  
     MaskBits&=~ALTBIT; J?%ecCN  
     break; w.o>G2u  
    case VK_CONTROL: K6EG"Vv!  
     MaskBits&=~CTRLBIT; @#QaaR;4  
     break; `e[>S  
    case VK_SHIFT: 7R7e3p,K  
     MaskBits&=~SHIFTBIT; 6>NK2} `  
     break; :*I=' M9B  
    default: //judge the key and send message q@&6&cd  
     break; -T=sY/O  
   } 5"9 '=LV~  
   for(int index=0;index<MAX_KEY;index++){ OK" fFv  
    if(hCallWnd[index]==NULL) .LI(2lP  
     continue;  7CwQmVe+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ib(G!oO:E-  
    { 92(P~Sdv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); n@$("p  
     bProcessed=TRUE; 6PyW(i(bs  
    } N;` jz(r  
   } U ATF}x   
  } -P:o ^_)g  
  else if((lParam&0xc000ffff)==1){ //有键按下 eA_]%7+`  
   switch(wParam) @%"r69\  
   { LsxRK5   
    case VK_MENU: BZOB\Ym  
     MaskBits|=ALTBIT; L_sDbAT~<  
     break; 7e:eL5f>~  
    case VK_CONTROL: E_ D0Nm%n  
     MaskBits|=CTRLBIT; hw({>cH\  
     break; uk9!rE"  
    case VK_SHIFT: 6L<QKE=  
     MaskBits|=SHIFTBIT; %Y-5L;MI  
     break; $d*PY_  
    default: //judge the key and send message HChlkj'7w0  
     break; d6e$'w@(\T  
   } aQ*?L l  
   for(int index=0;index<MAX_KEY;index++){ ?0tm{qP  
    if(hCallWnd[index]==NULL) B:96E&  
     continue; *cP(3n3]R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Aa+<4 R  
    { kx,3[qe'S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 37 b6w6{D  
     bProcessed=TRUE; 5t,X;  
    } i`}!<{k  
   } jG`,k*eUrJ  
  } 0at['zw  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 sSy!mtS  
   for(int index=0;index<MAX_KEY;index++){ 4Opf[3]  
    if(hCallWnd[index]==NULL) 4I8QM&7  
     continue; wvmcD%   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $It3}?>C'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); FQ"ED:lks  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 = N^Ec[u(l  
   } ~gdnD4[G  
  } ?sv[vR(  
 } a+^,EY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9@8'*a{`m  
} WP{U9YF2  
9aBz%* xo  
  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: w>e+UW25Y  
8ZCR9%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b}&.IJ&40j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eD|"?@cE  
!u;gGgQF  
  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: 3 MCV?"0  
$ {e5Ka  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hmB`+?,z*  
{ 3BSZz%va  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) }wZsM[NDB  
 { :_|Xr'n`A  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ojyP.R  
  SaveBmp(); D63?f\  
  return FALSE; Z*n4$?%W  
 } qpjiQ,\:b  
 …… //其它处理及默认处理 \]0#jI/:  
} OX7a72z  
WmOu#5*;  
D?FmlDTr[  
  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。 pVM1%n:#  
*v$j n  
  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。 _*cKu>,O  
N/eus"O;  
  二、编程步骤 i|rCGa0}  
\D1@UyE  
  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"; DzIV5FG  
1)3'Y2N*  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Wuk!\<T{  
E`Br#"/Bl  
  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; .kTOG'K\e  
}`aT=_B  
  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; g 'td(i[  
;9<?~S  
  5、 添加代码,编译运行程序。 X%5 `B2Wu  
G8WPXj(  
三、程序代码 biZ=TI2P,L  
p|em_!H"SH  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL XQ2 YUe]DJ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /9,y+"0SQz  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ gnYo/q=K  
#if _MSC_VER > 1000 J!}\v=Rn  
#pragma once ~iPXn1  
#endif // _MSC_VER > 1000 fWf't2H&  
#ifndef __AFXWIN_H__ \]g51U!'  
#error include 'stdafx.h' before including this file for PCH "ZL_  
#endif +,Or^p O=  
#include "resource.h" // main symbols dsOt(yNo  
class CHookApp : public CWinApp _U9.u#>sV  
{ Z_a@,k:+[  
 public: /A+5q\8G  
  CHookApp(); /Ny#+$cfk  
  // Overrides 7uf5w0]  
  // ClassWizard generated virtual function overrides bYmk5fpRG  
  //{{AFX_VIRTUAL(CHookApp) &fsk ESV0  
 public: T7-yZSw -m  
  virtual BOOL InitInstance(); Dw>)\\n{Kl  
  virtual int ExitInstance(); SW5n?Qj3-  
  //}}AFX_VIRTUAL >[&ser  
  //{{AFX_MSG(CHookApp) p(cnSvg  
  // NOTE - the ClassWizard will add and remove member functions here. E.*gKfL  
  // DO NOT EDIT what you see in these blocks of generated code ! S|T_<FCY  
  //}}AFX_MSG w}s5=>QG%  
  DECLARE_MESSAGE_MAP() x|gYxZ  
}; ?M^qSo=/~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 3.9/mztS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~Kl"V% >  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~pHuh#>  
BOOL InitHotkey(); h/2@4XKj  
BOOL UnInit(); %<r}V<OeR  
#endif <m0=bm{j  
E@6gTx*  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. W*?qOq {  
#include "stdafx.h" 3dJiu  
#include "hook.h" Z ;[xaP\S  
#include <windowsx.h> ,L MN@G  
#ifdef _DEBUG hUX8j9N>  
#define new DEBUG_NEW qL <@PC.5  
#undef THIS_FILE i3pOGa<  
static char THIS_FILE[] = __FILE__; `sA xk  
#endif 'blMwD{0&\  
#define MAX_KEY 100 AAqfp/DC  
#define CTRLBIT 0x04 B%`| W@v  
#define ALTBIT 0x02  FLZ9Rg  
#define SHIFTBIT 0x01 s:cJF  
#pragma data_seg("shareddata") #K*p1}rf  
HHOOK hHook =NULL; 76] Z~^Y  
UINT nHookCount =0; ^=a:{["@!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Qn~{TZz  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT \y6Y}Cv  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 2 6 >9$S  
static int KeyCount =0; &gr  T@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift p8"C`bCf  
#pragma data_seg() s>1\bio*I  
HINSTANCE hins; `GlOl-  
void VerifyWindow(); C,%Dp0  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Anqt:(  
//{{AFX_MSG_MAP(CHookApp) ).0p\.W~  
// NOTE - the ClassWizard will add and remove mapping macros here. K7C!ZXw~  
// DO NOT EDIT what you see in these blocks of generated code! K4o']{:U  
//}}AFX_MSG_MAP Vk2%yw>  
END_MESSAGE_MAP() Efoy]6P\  
w `+.F;}s  
CHookApp::CHookApp() qu!x#OY+  
{ 9I`0`o"A  
 // TODO: add construction code here, e z_c;  
 // Place all significant initialization in InitInstance <f=<r*6  
} {=,G>p  
%_!0V*X*  
CHookApp theApp; [k75+#'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =M9R~J!  
{ 0l/7JH_@V  
 BOOL bProcessed=FALSE; ;JgSA&'e  
 if(HC_ACTION==nCode) EQk omjv  
 { xFJT&=Af W  
  if((lParam&0xc0000000)==0xc0000000){// Key up wWSw0 H/  
   switch(wParam) -m[ tYp,q  
   { xA<-'8ST  
    case VK_MENU: IWm@pfC+g  
     MaskBits&=~ALTBIT; h~qv_)F_  
     break; [w-Tf&  
    case VK_CONTROL: \}%_FnP0ZU  
     MaskBits&=~CTRLBIT; I2pE}6q  
     break; >o%X;U 3  
    case VK_SHIFT: vbX.0f "n  
     MaskBits&=~SHIFTBIT; p!)PbSw#  
     break; 2pv by`P4  
    default: //judge the key and send message S4c-i2Rq  
     break; i3KAJ@  
   } u\/TR#b  
   for(int index=0;index<MAX_KEY;index++){ 1 <m.Q*  
    if(hCallWnd[index]==NULL) mM2I  
     continue; e>6W ^ )  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o( mA(h  
    { Jr%F#/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8N$Xq\Da+>  
     bProcessed=TRUE; qrjSG%i~J7  
    }  j=G  
   } C3N1t  
  } YMy**  
  else if((lParam&0xc000ffff)==1){ //Key down M= |is*t  
   switch(wParam) `c|H^*RC  
   { m5a'Vs  
    case VK_MENU: B*E"yB\NV  
     MaskBits|=ALTBIT;  >|gXE>  
     break; 8r:T&)v  
    case VK_CONTROL: wDSwcNS  
     MaskBits|=CTRLBIT; v-^<,|vm2f  
     break; GMkni'pV  
    case VK_SHIFT: LOu9#w"  
     MaskBits|=SHIFTBIT; qT:`F  
     break; +2k{y l  
    default: //judge the key and send message f}KV4'n  
     break; !KT.p2\  
   } #;lEx'lKN  
   for(int index=0;index<MAX_KEY;index++) H6>tto  
   { A>315!d"  
    if(hCallWnd[index]==NULL) qsN_EMgbdn  
     continue; }sJ}c}b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4~ &X]/_'  
    { fZS'e{V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R?,v:S&i7;  
     bProcessed=TRUE; ew~uOG+  
    } >WJQxL4  
   } }6 u)wF5  
  } wuxOFlrg  
  if(!bProcessed){ r+6 DlT a  
   for(int index=0;index<MAX_KEY;index++){ 69Z`mR  
    if(hCallWnd[index]==NULL) 7l09  
     continue; rf 60'   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {zc*yV\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0F6@aQ\y3  
   } TEGg)\+D>  
  } Im};wJ&  
 } (lq%4h  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); j~=<O<P  
} sFvYCRw /  
n=0^8QQ  
BOOL InitHotkey() u-bgk(u  
{ +afkpvj8  
 if(hHook!=NULL){ Sj*W|n\gj  
  nHookCount++; M0e&GR8<z>  
  return TRUE; kmlO}0  
 } u[4h|*'"|  
 else [H9<JdUZ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); V$iA3)7W%  
  if(hHook!=NULL) /,j'V r\"  
   nHookCount++; 3j[<nBsn.  
  return (hHook!=NULL); /qq*"R  
} |%rRALIY  
BOOL UnInit() u*oP:!s  
{ EG_P^ <z  
 if(nHookCount>1){ KV'3\`v@LY  
  nHookCount--; .m%5Esx  
  return TRUE; hYA1N&yz@  
 } >* F#ZZv}p  
 BOOL unhooked = UnhookWindowsHookEx(hHook); \l# H#~  
 if(unhooked==TRUE){ %kH,Rl\g  
  nHookCount=0; X'%BS  
  hHook=NULL; h Y *^rY'  
 } 6Bd:R}yZP7  
 return unhooked; Uxe]T  
} }dqOE-"I"n  
.vIRz-S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &$#NV@  
{ vfVF^ WOd  
 BOOL bAdded=FALSE; )7AjRtb!/  
 for(int index=0;index<MAX_KEY;index++){ _W,?_"[R=  
  if(hCallWnd[index]==0){ rJtk4hOF  
   hCallWnd[index]=hWnd; P.=Dd"La  
   HotKey[index]=cKey; 4{ZVw/VP,-  
   HotKeyMask[index]=cMask; CSwB+yN  
   bAdded=TRUE; M:d|M|'  
   KeyCount++; mZ3Z8q}%P  
   break; &Ot9"Aq:  
  } ,?%o ~  
 } C nD3%%  
 return bAdded; ]D^; Ca  
} Y[m*  
4 'vjU6gW  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  j~cG#t]  
{ gF;C% }  
 BOOL bRemoved=FALSE; Ly1t'{"7  
 for(int index=0;index<MAX_KEY;index++){ bIk4?S  
  if(hCallWnd[index]==hWnd){ M?n}{0E4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ mM+^v[=  
    hCallWnd[index]=NULL; -:Juxh  
    HotKey[index]=0; 9`@}KnvB?  
    HotKeyMask[index]=0; @)z?i  
    bRemoved=TRUE; e;"%h%'  
    KeyCount--; )IIWXN2A  
    break; gy#G;9p  
   } _?bF;R  
  } EU Oa8Z  
 } YW8Odm  
 return bRemoved; 8)b*q\ O'  
} n2["Ln mO  
Np.<&`p!  
void VerifyWindow() &s\/Uq  
{ q^QLNKOH"  
 for(int i=0;i<MAX_KEY;i++){ (8~Hr?1B  
  if(hCallWnd!=NULL){ 3#F"UG2,_  
   if(!IsWindow(hCallWnd)){ / =v1.9(  
    hCallWnd=NULL; C [8='i26  
    HotKey=0; N]|)O]/[  
    HotKeyMask=0; 1vq c8lC  
    KeyCount--; w'mn O'%  
   } 78]( ZYJV  
  } ' (3|hh)Tl  
 } cz$*6P<9J  
} <#T #+uO  
#,!/Cnqis  
BOOL CHookApp::InitInstance() !Pd)  
{ u 1Wixjd|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); y99|V39'  
 hins=AfxGetInstanceHandle(); Xcg+ SOB  
 InitHotkey(); Xupwh5G2  
 return CWinApp::InitInstance(); %kQ[z d^  
} Dk g-y9  
CzmB76zy.  
int CHookApp::ExitInstance() Z22#lF\N  
{ ;`a~9uG  
 VerifyWindow(); iTCY $)J  
 UnInit(); S9qc34\^=  
 return CWinApp::ExitInstance(); 9; aOUs:<  
} X}&Y(kOT  
>kDkvg1"  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Cv]$w(k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) U/\LOIs  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ d! _8+~  
#if _MSC_VER > 1000 r+h$]OJ  
#pragma once irGgo-x  
#endif // _MSC_VER > 1000 y"w`yl{_  
jF{\=&fU  
class CCaptureDlg : public CDialog QG XR<Y  
{ -}H EV#ev  
 // Construction =~k#<q1^  
 public: TO] cZZ<  
  BOOL bTray; ;\Pq  
  BOOL bRegistered; Z. xOO|  
  BOOL RegisterHotkey(); j3/K;U/SGJ  
  UCHAR cKey; "z{ rC}  
  UCHAR cMask; <bh!wf6;  
  void DeleteIcon(); :8lqo%5  
  void AddIcon(); R^JtWjJR  
  UINT nCount; QY1|:(  
  void SaveBmp(); "^VPe[lA  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (;++a9GK  
  // Dialog Data ^'hh?mL  
  //{{AFX_DATA(CCaptureDlg) }>'1Qg  
  enum { IDD = IDD_CAPTURE_DIALOG }; E*}1_,q)  
  CComboBox m_Key; C4eQ.ep  
  BOOL m_bControl; |vh{Kb@  
  BOOL m_bAlt; ;n/04z  
  BOOL m_bShift; )zo:Bo .<  
  CString m_Path; R]TS5b-  
  CString m_Number; ?!n0N\|i]  
  //}}AFX_DATA mGc i >)2  
  // ClassWizard generated virtual function overrides 9?+?V}o  
  //{{AFX_VIRTUAL(CCaptureDlg) Sfffm$H  
 public: [nB4s+NX  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @t3&#I}mc  
 protected: ;2,Q:&`   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )"Dl,Fig:/  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q_h/zPuH'  
  //}}AFX_VIRTUAL  <+p{U(  
  // Implementation b./MVz  
 protected: QbEb} Jt  
  HICON m_hIcon; cGv`%  
  // Generated message map functions PW"uPn  
  //{{AFX_MSG(CCaptureDlg) SbD B[O%  
  virtual BOOL OnInitDialog(); cdD?QnZ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2zbV9Bhq  
  afx_msg void OnPaint(); s-T#-raE  
  afx_msg HCURSOR OnQueryDragIcon(); W7q!F  
  virtual void OnCancel(); DG 6W ^  
  afx_msg void OnAbout(); &MP +  
  afx_msg void OnBrowse(); T^ RYN  
  afx_msg void OnChange(); 7[YulC-pH  
 //}}AFX_MSG nztnU9OG  
 DECLARE_MESSAGE_MAP() p-2PC{% t|  
}; ]4)$dQ59  
#endif - ]U2G:  
xn2f!\%p  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file l1" *  
#include "stdafx.h" y- @{  
#include "Capture.h" m+pFU?<|  
#include "CaptureDlg.h" s )7sgP  
#include <windowsx.h> 3;wOA4ur  
#pragma comment(lib,"hook.lib") bA(-7l?  
#ifdef _DEBUG @[hD;xO  
#define new DEBUG_NEW ~L=? F  
#undef THIS_FILE ge$p/  
static char THIS_FILE[] = __FILE__; lQf38u||  
#endif ~_ |ZUb  
#define IDM_SHELL WM_USER+1 crr#tad.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .=/TT|eMS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C{FE*@U.  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hta y-  
class CAboutDlg : public CDialog {3|h^h_R  
{ T9-2"M=|<  
 public: WXJ%hA  
  CAboutDlg(); ,qK3 3Bn  
  // Dialog Data Qjd<%!]+\  
  //{{AFX_DATA(CAboutDlg) /fC8jdp&  
  enum { IDD = IDD_ABOUTBOX }; i-`J+8|d  
  //}}AFX_DATA :lp V  
  // ClassWizard generated virtual function overrides p!H'JNG  
  //{{AFX_VIRTUAL(CAboutDlg) K&TO8   
 protected: +y9WJ   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ag0)> PD^  
  //}}AFX_VIRTUAL &Q[|FO;[  
  // Implementation :Wd@Qy?;  
 protected: 5HW'nhE  
  //{{AFX_MSG(CAboutDlg) ;hJz'&UWQ  
  //}}AFX_MSG P] qL&_  
  DECLARE_MESSAGE_MAP() \CZD.2p#&  
}; NrWgaPO)i  
=4:]V\o):'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Q <2 `ek  
{ Zo T8  
 //{{AFX_DATA_INIT(CAboutDlg) `z?h=&N  
 //}}AFX_DATA_INIT ) 0|X];sD  
} .dTXC'  
H{VJ S Jc{  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 2#`9OLu8X  
{ cxn*!TwDs  
 CDialog::DoDataExchange(pDX); !9vq"J~hz"  
 //{{AFX_DATA_MAP(CAboutDlg) C=<PYkt,L  
 //}}AFX_DATA_MAP W&;,7T8@  
} T6I$7F  
raB', Vp  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +`l)W`zX  
 //{{AFX_MSG_MAP(CAboutDlg) ,!oR"b!  
 // No message handlers o$KW*aDp  
 //}}AFX_MSG_MAP y}GFtRNG  
END_MESSAGE_MAP() BFn4H%1  
)^LiAL h  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) zT ; +akq  
: CDialog(CCaptureDlg::IDD, pParent) ]T1\gv1~  
{ )5/,B-+O"  
 //{{AFX_DATA_INIT(CCaptureDlg) $Lt'xW`8  
  m_bControl = FALSE; p{oc}dWin  
  m_bAlt = FALSE; LV`tnt's  
  m_bShift = FALSE; cOvdC4  
  m_Path = _T("c:\\"); s1%th"e [  
  m_Number = _T("0 picture captured."); O("13cU  
  nCount=0; 8>a%L?BY  
  bRegistered=FALSE; 9 1ndr@*|  
  bTray=FALSE; c^x5 E`{  
 //}}AFX_DATA_INIT @"O|[%7e  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gfly?)VnF  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); c, FZ{O@  
} 0artR~*}  
9 y{R_  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) DW0N}>Gp*  
{ L(t!C~3  
 CDialog::DoDataExchange(pDX); NM0s*s42  
 //{{AFX_DATA_MAP(CCaptureDlg) Fu[<zA^  
  DDX_Control(pDX, IDC_KEY, m_Key); y4j\y ? T8  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); qcGsx2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); -DL"Yw}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); dd:vQOF;  
  DDX_Text(pDX, IDC_PATH, m_Path); ZXC_kmBN/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); k8E{pc6;  
 //}}AFX_DATA_MAP 4{CeV7  
} ^~JF7u  
S$NJmXhx5  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {YF(6wVl  
//{{AFX_MSG_MAP(CCaptureDlg) Df.eb|[{  
 ON_WM_SYSCOMMAND() OZ6:u^OS]  
 ON_WM_PAINT() xt1Ug~5  
 ON_WM_QUERYDRAGICON() .njk^,N  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ~UQX t r  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) LW!>_~g-  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %abc -q  
//}}AFX_MSG_MAP v?(z4oOD/>  
END_MESSAGE_MAP() @cu#rWiG  
\/F*JPhy  
BOOL CCaptureDlg::OnInitDialog() XWag+K  
{ sr-tZ^d5S?  
 CDialog::OnInitDialog(); ) m(!lDz3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Wg\MaZ6Di  
 ASSERT(IDM_ABOUTBOX < 0xF000); vC!B}~RG  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^5rB/y,  
 if (pSysMenu != NULL) _t?#  
 { dry>TXG*  
  CString strAboutMenu; "X \Yp_g  
  strAboutMenu.LoadString(IDS_ABOUTBOX); W?<<al*  
  if (!strAboutMenu.IsEmpty()) -1}&\=8M  
  { +,T z +!  
   pSysMenu->AppendMenu(MF_SEPARATOR); >9<YQ(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); iCtS<"@Yx  
  } iaHL&)[YK  
 } ]]XXcQ,A  
 SetIcon(m_hIcon, TRUE); // Set big icon W:JR\KKU  
 SetIcon(m_hIcon, FALSE); // Set small icon o'K= X E  
 m_Key.SetCurSel(0); ([dJ'OPx$  
 RegisterHotkey(); G>,43S!<  
 CMenu* pMenu=GetSystemMenu(FALSE); gubw&W  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 1 RVs!;  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); d'@i8N["{  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?10L *PD@  
 return TRUE; // return TRUE unless you set the focus to a control W5Vh+'3  
} (/KeGgkhv  
QB ; jZpF  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) G124! ^  
{ SA%uGkm:e  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) TlD^EJG  
 { OM?FpRVU8  
  CAboutDlg dlgAbout; F+)g!NQZ  
  dlgAbout.DoModal(); jwmPy)X|s\  
 } TgA>(HcO  
 else _o? I=UN2:  
 { `t3w|%La}  
  CDialog::OnSysCommand(nID, lParam); LjCUkbzQF  
 } V I]~uTV  
} p# JPLCs  
';xp+,'}\  
void CCaptureDlg::OnPaint() #=N6[:,  
{ @6b4YV h  
 if (IsIconic()) ^ddC a  
 { eh}|Wd7J  
  CPaintDC dc(this); // device context for painting B*:W`}G]_c  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?-JW2 E"uT  
  // Center icon in client rectangle Q7-'5s   
  int cxIcon = GetSystemMetrics(SM_CXICON); OmlM9cXm^4  
  int cyIcon = GetSystemMetrics(SM_CYICON); BvP++,a&Sa  
  CRect rect; -?w3j9kk>  
  GetClientRect(&rect); |f1RhB  
  int x = (rect.Width() - cxIcon + 1) / 2; i?861Hu  
  int y = (rect.Height() - cyIcon + 1) / 2; Ffig0K+ `  
  // Draw the icon (L`IL e*  
  dc.DrawIcon(x, y, m_hIcon); UJ><B"  
 } o:`^1  
 else `=%G&_3_<  
 { X@za4d  
  CDialog::OnPaint(); {01^xn.  
 } M[P1hFuna  
} .rQcg.8/B  
N?IdaVLj  
HCURSOR CCaptureDlg::OnQueryDragIcon() }Z)YK}_1  
{ Q w)U  
 return (HCURSOR) m_hIcon; w5=<}1`St  
} )JY#8,{w  
d2fiPI7lg  
void CCaptureDlg::OnCancel() ;@qQ^!g2  
{ f.0HIc  
 if(bTray) is=x6G*r  
  DeleteIcon(); T?CQgVR  
  CDialog::OnCancel(); +wfZFJ:1l  
} A<IV"bo  
mbHMy[R  
void CCaptureDlg::OnAbout() NfZC}  
{ +xQj-r)-  
 CAboutDlg dlg; SgkW-#  
 dlg.DoModal(); <5zr|BTF]F  
} Zt}b}Bz  
-$I$zo  
void CCaptureDlg::OnBrowse() EAHdt=8W{  
{ OZ/"W)  
 CString str; H(kxRPH4@]  
 BROWSEINFO bi; =.l>Uw!  
 char name[MAX_PATH]; f|Nkk*9$  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); W9]0X  
 bi.hwndOwner=GetSafeHwnd(); *0m|`- T  
 bi.pszDisplayName=name; 3;88a!AA!  
 bi.lpszTitle="Select folder"; P MI?PC[;  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :s1.TQ;Y(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); eQ,VK`7X  
 if(idl==NULL) oJ|m/i)  
  return; G=l:v  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); xl Q]"sm1  
 str.ReleaseBuffer(); SNf~%B?`L  
 m_Path=str; &yI>A1  
 if(str.GetAt(str.GetLength()-1)!='\\') Oj8D+sC{  
  m_Path+="\\"; $`P]%I}  
 UpdateData(FALSE); :lu"14  
} bI8')a  
#mD_<@@  
void CCaptureDlg::SaveBmp() ?rziKT5OOC  
{ }{mS"  
 CDC dc; %vbov}R  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); _+Z5qUmQ  
 CBitmap bm; !wC( ]Y  
 int Width=GetSystemMetrics(SM_CXSCREEN); /T 2 v`Li  
 int Height=GetSystemMetrics(SM_CYSCREEN); ^CD? SP"i  
 bm.CreateCompatibleBitmap(&dc,Width,Height); [E/. r{S  
 CDC tdc; > w SI0N  
 tdc.CreateCompatibleDC(&dc); MRT<hB  
 CBitmap*pOld=tdc.SelectObject(&bm); ]Bs{9=2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); FGeKhA 8jT  
 tdc.SelectObject(pOld); aGAr24]y  
 BITMAP btm; r.c:QY$  
 bm.GetBitmap(&btm); /N,\st  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [fY7|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); k1SD{BL  
 BITMAPINFOHEADER bih; &da:{  
 bih.biBitCount=btm.bmBitsPixel; 7>F[7_  
 bih.biClrImportant=0; .3#Xjhebvu  
 bih.biClrUsed=0; `aA)n;{/2u  
 bih.biCompression=0; "~KTLf  
 bih.biHeight=btm.bmHeight; J&B5Ll  
 bih.biPlanes=1; I9x kqj  
 bih.biSize=sizeof(BITMAPINFOHEADER); F I~=A/:  
 bih.biSizeImage=size; +G+1B6S  
 bih.biWidth=btm.bmWidth; lqa~ZF*  
 bih.biXPelsPerMeter=0; yqR]9 "a  
 bih.biYPelsPerMeter=0; mQ9shdvt-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 'T7Y5X80$j  
 static int filecount=0; <9c{Kt.5(  
 CString name; wk'&n^_br  
 name.Format("pict%04d.bmp",filecount++); d. ZfK  
 name=m_Path+name; L-zU%`1{M  
 BITMAPFILEHEADER bfh; $LcMG,8%_  
 bfh.bfReserved1=bfh.bfReserved2=0; b1G6'~U-  
 bfh.bfType=((WORD)('M'<< 8)|'B'); '&$zgK9T?  
 bfh.bfSize=54+size; X&Sah}0V&  
 bfh.bfOffBits=54; (W}DMcuSd  
 CFile bf; /SyAjZ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ G<]@nP{P  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); f8G<5_!K_  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -9Ygn_M  
  bf.WriteHuge(lpData,size); aj=-^iGG  
  bf.Close(); /1uGsE+[  
  nCount++; h iK}&  
 } P@% L.y B  
 GlobalFreePtr(lpData); jy_4W!4a  
 if(nCount==1) :Ys ;)W+R  
  m_Number.Format("%d picture captured.",nCount); X":2o|R  
 else d= ?lPEzSA  
  m_Number.Format("%d pictures captured.",nCount); Z?WVSJUVf  
  UpdateData(FALSE); s3'kzwX  
} Fc=6 *.hy  
7]~|dc(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <9T,J"y  
{ {,?Gj@$  
 if(pMsg -> message == WM_KEYDOWN) (y1S*_D  
 { KHGUR(\Rd6  
  if(pMsg -> wParam == VK_ESCAPE) )*Wz5x  
   return TRUE; tu/4  
  if(pMsg -> wParam == VK_RETURN) j?g#8L;W\w  
   return TRUE; QL2 `X2  
 } HrMbp  
 return CDialog::PreTranslateMessage(pMsg); EQX<<x"  
} "-j96 KD  
x(p/9$.#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m\E=I5*/  
{ ^:,wk7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ooP{Q r  
  SaveBmp(); o 9(x\g  
  return FALSE;  j8]M}Q$  
} O^ 5C  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;jO+<~YP!  
 CMenu pop; |;^$IZSsz  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); lR mVeq:  
 CMenu*pMenu=pop.GetSubMenu(0); [nlq(DGJhp  
 pMenu->SetDefaultItem(ID_EXITICON); `:jF%3ks+0  
 CPoint pt; e)}=T0 s  
 GetCursorPos(&pt); TtQd#mSI\  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); a^ys7UV  
 if(id==ID_EXITICON) l.Z+.<@  
  DeleteIcon(); nZG zez  
 else if(id==ID_EXIT) k_?~@G[I  
  OnCancel(); %(H' j@D[  
 return FALSE; ^NM>x Ienf  
} F+j"bhe  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 4/v[ .5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~QUN O~  
 AddIcon(); c%&*yR  
 return res; kuq&; uk$Q  
} ZwiXeD+4  
<*P)"G  
void CCaptureDlg::AddIcon() .ud&$-[a  
{ xsNOjHk  
 NOTIFYICONDATA data; jj]|}G  
 data.cbSize=sizeof(NOTIFYICONDATA); HiD%BL>%  
 CString tip; :bL^S1et  
 tip.LoadString(IDS_ICONTIP); 1/6}E]-F  
 data.hIcon=GetIcon(0); DF-.|-^9I  
 data.hWnd=GetSafeHwnd(); sP~xe(  
 strcpy(data.szTip,tip); K@:Ab'(P^|  
 data.uCallbackMessage=IDM_SHELL; " BLJh)i  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; NbCIL8f]  
 data.uID=98; P m&^rC;  
 Shell_NotifyIcon(NIM_ADD,&data); 5H|7DVG  
 ShowWindow(SW_HIDE); K4I/a#S'@6  
 bTray=TRUE; 2L51 H(  
} I1s$\NZ~]  
lhf5[Rp  
void CCaptureDlg::DeleteIcon() h##U=`x3  
{ n</Rd=  
 NOTIFYICONDATA data; =}Q|#C  
 data.cbSize=sizeof(NOTIFYICONDATA); D 5:'2i  
 data.hWnd=GetSafeHwnd(); Fq%NY8KNE  
 data.uID=98; 8-cuaa  
 Shell_NotifyIcon(NIM_DELETE,&data); qv |}>wU  
 ShowWindow(SW_SHOW); KP $AT}D  
 SetForegroundWindow();  -rT#Wi  
 ShowWindow(SW_SHOWNORMAL); j0w@ \gO<  
 bTray=FALSE; 8:0,jnS  
} Der'45]*^  
mX?t|:[b  
void CCaptureDlg::OnChange() XN{zl*`  
{ B(O6qWsL  
 RegisterHotkey(); x5rLGt  
} 4Y4zBD=<  
@RL'pKab9  
BOOL CCaptureDlg::RegisterHotkey() u:B=lZ[  
{ +rhBC V  
 UpdateData(); K}GR U)  
 UCHAR mask=0; Prc1U)nfo  
 UCHAR key=0; AVfF<E/  
 if(m_bControl) F IB)cpo  
  mask|=4; Y]5MM:mI  
 if(m_bAlt) `)MKCw$e  
  mask|=2; fvV"H{V,  
 if(m_bShift) >;VZB/ d  
  mask|=1; #q-fRZ:P  
  key=Key_Table[m_Key.GetCurSel()]; TefPxvd  
 if(bRegistered){ $Zkk14  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @gM}&G08  
  bRegistered=FALSE; xVN!w\0  
 } 2U"2L^oKI  
 cMask=mask; :JZV=@<T  
 cKey=key; 9E0x\%2K  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); FU.?n)P  
 return bRegistered; F[W0gjUc  
} z+CX$.Z  
*O\lR-z!k  
  四、小结 wm9wnAy  
;:>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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