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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: /sKL|]i=  
  &R72$H9C8i  
  一、实现方法 S:_Ms{S  
YO7U}6wBt  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: E JkHPn  
;?2)[a  
#pragma data_seg("shareddata") hC:'L9Y  
HHOOK hHook =NULL; //钩子句柄 p`Pa;=L  
UINT nHookCount =0; //挂接的程序数目 ~$HB}/  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Y_'ERqQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x4'@U<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 7s|'NTp  
static int KeyCount =0; I@'[>t  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 g<:Lcg"u  
#pragma data_seg() JY0aE  
>H;i#!9,  
  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。 FQ< -Wc  
\HeJc:^  
  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: h&<"jCjL  
$xbC^ k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +lym8n~-O  
cKey,UCHAR cMask) +vh|m5"7I7  
{ XNYA\%:5S  
 BOOL bAdded=FALSE; ;>J!$B?,  
 for(int index=0;index<MAX_KEY;index++){ .Mq#88o.*  
  if(hCallWnd[index]==0){ &K9;GZS?  
   hCallWnd[index]=hWnd; &uNec( c  
   HotKey[index]=cKey; _gT65G~z  
   HotKeyMask[index]=cMask; '$tCAS  
   bAdded=TRUE; jdxHWkQ   
   KeyCount++; TrjyU  
   break; Lzh8-d=HQ  
  } xE1?)  
 } <>] DcA  
 return bAdded; uk):z$ x  
} H bKE;N  
//删除热键 d6luksO*9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <|Td0|x _q  
{ <XdnVe1  
 BOOL bRemoved=FALSE; [ RyVR  
 for(int index=0;index<MAX_KEY;index++){ j_8 YFz5  
  if(hCallWnd[index]==hWnd){ !vSI"$xd  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \<LCp;- K  
    hCallWnd[index]=NULL; 2@|`Ugjptl  
    HotKey[index]=0; ]EiM~n  
    HotKeyMask[index]=0; iiPVqU%  
    bRemoved=TRUE; !7N:cx'Qy  
    KeyCount--; 11H`WOTQF  
    break; = L!&Z  
   } :R;w<Tbz"  
  } s6`E.Eevm  
 } V"/.An|  
 return bRemoved; xVx s~p1  
} -c`xeuzK'  
|a(KVo  
LE\*33k_  
  DLL中的钩子函数如下: (Z),gxt  
]*2),H1 c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~MG6evm &  
{ 4 2Z:J 0  
 BOOL bProcessed=FALSE; O=0p}{3l  
 if(HC_ACTION==nCode) 5GsmBf$RUb  
 { TDh)}Ms  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 z74JyY  
   switch(wParam) PUdv1__C  
   {  BIx*t9wA  
    case VK_MENU: t>bzo6cj  
     MaskBits&=~ALTBIT; Za|7gt];l  
     break; q*hn5K*  
    case VK_CONTROL: m06'T2I  
     MaskBits&=~CTRLBIT; .n 9.y8C  
     break; V._-iw]v  
    case VK_SHIFT: =M\yh,s!  
     MaskBits&=~SHIFTBIT; bxXpw&  
     break; >q}3#TvP@  
    default: //judge the key and send message 0Wr<l%M)+  
     break; QQJGqM3a2  
   } s9?mX@>h  
   for(int index=0;index<MAX_KEY;index++){  {53FR  
    if(hCallWnd[index]==NULL) A(y6]E!  
     continue; 1-kuK<KR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V3,C5KKk&z  
    { 9jal D X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ia2WBs =  
     bProcessed=TRUE; e{)giJY9  
    } z|g2Q#$-\S  
   } 49qa  
  } M Kyj<@[  
  else if((lParam&0xc000ffff)==1){ //有键按下 \8{SQ%  
   switch(wParam) lu#a.41  
   { zEQ]5>mG  
    case VK_MENU: ?^&ih:"  
     MaskBits|=ALTBIT; +t7HlAXB#  
     break; IFLphm5  
    case VK_CONTROL: ql?w6qFs]  
     MaskBits|=CTRLBIT; </I%VHP,[f  
     break; > X~\(|EM  
    case VK_SHIFT: uLdHE5vr  
     MaskBits|=SHIFTBIT; q!z?Tn#!jd  
     break; s< tG  
    default: //judge the key and send message u Kx:7"KD  
     break; b_+o1Zy`  
   } 0|GYtnd  
   for(int index=0;index<MAX_KEY;index++){ Es=G' au  
    if(hCallWnd[index]==NULL) [@K'}\U^+  
     continue;  hb[ThQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?$pNduE  
    { @nH3nn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %`C e#b()'  
     bProcessed=TRUE; vn.5X   
    } pMU\f  
   } KXWcg#zFY  
  } htB2?%S=T  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 {|9knP  
   for(int index=0;index<MAX_KEY;index++){ Dl!0Hl  
    if(hCallWnd[index]==NULL) .][yH[ F  
     continue; W{NWF[l8O?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) U][E`[m#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m[%356u  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 g`y9UYeh  
   } <@J$hs9s  
  } V9[_aP;  
 } 8@3=SO  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); > ?+Rtg|${  
} i4YskhT  
h7]+#U]mi  
  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: 49"C'n0wST  
:(q4y-o6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W6?=9].gc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J.iz%8  
N XB8u6  
  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: 4~ x>]  
BA a:!p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,ei9 ?9J1  
{ u6C_*i{2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) fw%p_Cm  
 { C:1(<1K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a`Bp^(f}  
  SaveBmp(); AO<T6 VK  
  return FALSE; nOC\ =<Nsg  
 } V lZ+x)E  
 …… //其它处理及默认处理 B7Ket8<J  
} U&"L9o`2  
EWJB /iED  
jdG'sITv  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 J{/hc} $  
\Fjasz5E'  
  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。 GW {tZaB  
gwB,*.z  
  二、编程步骤 MJX ny4n  
}P.s  
  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"; ]Zb9F[  
F6vsU:TfB  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; .H|Z3d!Jj  
:h@V,m Z  
  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; w&@tP^`  
[Or1  
  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; Q & /5B  
c@>ztQU*  
  5、 添加代码,编译运行程序。 KXMf2)pa  
i, ^-9  
三、程序代码 lLQcyi0  
o?]Q&,tO  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @<DRFP  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) A^lm0[3q  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9>{ml&$  
#if _MSC_VER > 1000 @+;.W>^h  
#pragma once .i\ FK@2  
#endif // _MSC_VER > 1000 ;)ay uS sQ  
#ifndef __AFXWIN_H__ )pI( <  
#error include 'stdafx.h' before including this file for PCH G=qlE?j`j  
#endif / 0$ !.  
#include "resource.h" // main symbols '&Ur(axs  
class CHookApp : public CWinApp (bm> )U=  
{ `U0XvWPr[  
 public: /'oo;e  
  CHookApp(); IV~)BW leT  
  // Overrides C32*RNG?U  
  // ClassWizard generated virtual function overrides R1JD{  
  //{{AFX_VIRTUAL(CHookApp) ~v&Q\>'  
 public: B\D)21Ik}%  
  virtual BOOL InitInstance(); }^I36$\  
  virtual int ExitInstance(); o4: e1  
  //}}AFX_VIRTUAL @Mg&T$  
  //{{AFX_MSG(CHookApp) ](I||JJa9f  
  // NOTE - the ClassWizard will add and remove member functions here. G{?`4=K  
  // DO NOT EDIT what you see in these blocks of generated code ! koB'Zp/FaY  
  //}}AFX_MSG 9T;>gm  
  DECLARE_MESSAGE_MAP() RAa1^Qb  
}; T T 3 6Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); bV:<%l]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b\^DQZmth  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RH,x);J|  
BOOL InitHotkey(); tIn`L6b  
BOOL UnInit(); CeU=A9  
#endif v$ \<L|  
m p_7$#{l  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. a2?@OJ  
#include "stdafx.h" ;u`8pF!_eE  
#include "hook.h" !,$K;L  
#include <windowsx.h> Bor_(eL^  
#ifdef _DEBUG iB99.,o-&  
#define new DEBUG_NEW zw'%n+5m  
#undef THIS_FILE =~s+<9c]  
static char THIS_FILE[] = __FILE__; _an 0G?7  
#endif q4X( _t  
#define MAX_KEY 100 Z|KDi `S  
#define CTRLBIT 0x04 Lapeh>1T  
#define ALTBIT 0x02 -[N9"Z,  
#define SHIFTBIT 0x01 7.2G}O6$  
#pragma data_seg("shareddata") RKzO$T  
HHOOK hHook =NULL; |t"CH'KJZ  
UINT nHookCount =0; :tbI=NDb  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey cK[=IE5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT I[rR-4.F]  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey r4cz?e |  
static int KeyCount =0; X<_HQ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift XD8Cf!  
#pragma data_seg() Qu<6X@+5  
HINSTANCE hins; {oOUIP  
void VerifyWindow(); $+2QbEk&-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >/RFff]Fh0  
//{{AFX_MSG_MAP(CHookApp) ] 0L=+=w  
// NOTE - the ClassWizard will add and remove mapping macros here. ZweAY.]e  
// DO NOT EDIT what you see in these blocks of generated code! {nM1$  
//}}AFX_MSG_MAP |[r7B*fw  
END_MESSAGE_MAP() kE6/d,  
nN.Gn+Cl  
CHookApp::CHookApp() ,^n&Q'p3  
{ 6? lAbW  
 // TODO: add construction code here, -vm1xp$  
 // Place all significant initialization in InitInstance E"[p_ALdC  
} wIAH,3!  
!m))Yp-"H  
CHookApp theApp; N,B!D~@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) q%M~gp1  
{ W'Ew!]Q3  
 BOOL bProcessed=FALSE; bD/ZKvg  
 if(HC_ACTION==nCode) 7V@r^/`8N  
 { &tbAXU5$  
  if((lParam&0xc0000000)==0xc0000000){// Key up #oiU|>3Y  
   switch(wParam) W=g'Xu!|!2  
   { |d~'X%b%  
    case VK_MENU: M^OYQf  
     MaskBits&=~ALTBIT; rF}Q(<Y86  
     break; U<F|A!Fg  
    case VK_CONTROL: 6.tA$#6HP  
     MaskBits&=~CTRLBIT; '>"blfix8  
     break; zqt%x?l  
    case VK_SHIFT: L1+s0g>  
     MaskBits&=~SHIFTBIT; DO{otn 9<  
     break; Q)XH5C2X  
    default: //judge the key and send message cjhwJ"`H  
     break; oR8'^G0<  
   } hl0X, G+@  
   for(int index=0;index<MAX_KEY;index++){ mw^>dv?  
    if(hCallWnd[index]==NULL) uDJ;GD[yc  
     continue; z.(DDj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lq.]@zlSO  
    { k(7Q\JKE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); rS!@AgPLE  
     bProcessed=TRUE; *MlEfmB(  
    } /? d)01  
   } pdFO!A_t  
  } }M(xN6E  
  else if((lParam&0xc000ffff)==1){ //Key down qGhg?u"n:  
   switch(wParam) ?Hdu=+ZV  
   { ) x+edYw  
    case VK_MENU: n(V{ [  
     MaskBits|=ALTBIT; aso8,mpZuA  
     break; nVoWER:  
    case VK_CONTROL: %=*|: v  
     MaskBits|=CTRLBIT; ?vbAaRg50s  
     break; 8G$BQ  
    case VK_SHIFT: <L*`WO]\l  
     MaskBits|=SHIFTBIT; wA 7\K~fHV  
     break; jPo,mz&^  
    default: //judge the key and send message zp:QcL"  
     break; 7*M-?  
   } tBJ4lb  
   for(int index=0;index<MAX_KEY;index++) RcJtVOrd  
   { )2l @%?9  
    if(hCallWnd[index]==NULL) Y j bp:  
     continue; ,) dlL tUm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a-S tOO5s  
    { IIT[^_g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R|$b\3  
     bProcessed=TRUE; iO Z#}"  
    } %rhZH^2  
   } iF +@aA  
  } }=\?]9`  
  if(!bProcessed){ 5|r*,! CF  
   for(int index=0;index<MAX_KEY;index++){ 21Dc.t{  
    if(hCallWnd[index]==NULL) U8NX%*oW  
     continue; )HI\T];  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) m3o -p   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2<!IYEyT  
   } DOGGQ$0  
  } |qj"p  
 } co\Il]`R/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); - 7T`/6  
} a6;[Z  
.`_iWfK  
BOOL InitHotkey() i5Sya]FN  
{ 8!.V`|@lt  
 if(hHook!=NULL){ |By[ev"Kh%  
  nHookCount++; %,~\,+NP  
  return TRUE; WvArppANo  
 } 5oCg&aT  
 else cNwH Y Z'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~@6l7H6{  
  if(hHook!=NULL) }[lP^Qs  
   nHookCount++; jDQ?b\^  
  return (hHook!=NULL); - G/qfd|s/  
} 'nM4t  
BOOL UnInit() Ye$j43b  
{ hQY`7m>L  
 if(nHookCount>1){ `V<jt5TS  
  nHookCount--; gd7r9yV  
  return TRUE; K^@9\cl^  
 } ))Z>$\<:  
 BOOL unhooked = UnhookWindowsHookEx(hHook); vR!g1gI23  
 if(unhooked==TRUE){ Wq+GlB*  
  nHookCount=0; 0,m]W)  
  hHook=NULL; "@hd\w{.  
 } #\=7A  
 return unhooked; e Csk\f`  
} U+>M@!=  
_4)z:?G5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LWTPNp:"{w  
{ z7AWWr=H  
 BOOL bAdded=FALSE; flC%<V%'-  
 for(int index=0;index<MAX_KEY;index++){ = &pLlG  
  if(hCallWnd[index]==0){ 6hd<ys?  
   hCallWnd[index]=hWnd; R{bG`C8.d  
   HotKey[index]=cKey; GrJLQO0$N  
   HotKeyMask[index]=cMask; &V~l(1  
   bAdded=TRUE; =$)M-;6  
   KeyCount++; \$.{*f  
   break; LFW`ISY{  
  } N%Ta. `r  
 } %c\k LSe  
 return bAdded; *5k40?w  
} ]OdZlZBsJ  
4c(Em+ 4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I-g/ )2  
{ $F# 5/gDVQ  
 BOOL bRemoved=FALSE; $fg@g7_:  
 for(int index=0;index<MAX_KEY;index++){ 8Vj'&UY  
  if(hCallWnd[index]==hWnd){ 7p2xst  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I_z(ft.  
    hCallWnd[index]=NULL; TbNH{w|p  
    HotKey[index]=0; p)iEwl}!j  
    HotKeyMask[index]=0; MomHSvQ\  
    bRemoved=TRUE; 7pY :.iVO  
    KeyCount--; hPNMp@Nm6  
    break; #I453  
   } n}A!aC  
  } Mhti  
 } /QyKXg6)l  
 return bRemoved; R^/SBrWve  
} 0stc$~~v  
+ppA..1  
void VerifyWindow() : (X3?%  
{ 37jxl+  
 for(int i=0;i<MAX_KEY;i++){ :p: C  
  if(hCallWnd!=NULL){ {LF4_9 =  
   if(!IsWindow(hCallWnd)){ CKK}Z;~:  
    hCallWnd=NULL; ]r|oNGD)G  
    HotKey=0; :[_ms d  
    HotKeyMask=0; 1 rhZlmf[r  
    KeyCount--; '-RacNY  
   } }}tbOD)t  
  } < z2wt  
 } A)C)5W  
} @lE'D":?  
-%yrs6  
BOOL CHookApp::InitInstance() ;50&s .gZ  
{ ,n8\y9{G  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); sNo8o1Hby  
 hins=AfxGetInstanceHandle(); i}DS+~8v  
 InitHotkey(); [A,^ F0:h  
 return CWinApp::InitInstance(); ]$lt  
} iI IXv  
'v V7@@  
int CHookApp::ExitInstance() pCh v;  
{ Wvr{l  
 VerifyWindow(); + tMf&BZ  
 UnInit(); \$w kr  
 return CWinApp::ExitInstance(); P7.bn  
} &R%'s1]o  
,?|$DY+=  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file OA[e}Vn  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ] c7X~y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g5@g_~ g  
#if _MSC_VER > 1000 GcdJf/k  
#pragma once _5-h\RB)  
#endif // _MSC_VER > 1000 H TOr  
&2`p#riAS  
class CCaptureDlg : public CDialog (\{k-2t*^  
{ /qX?ca1_4^  
 // Construction V|_ h[hXE  
 public: O[C4xq  
  BOOL bTray; ^E.L8  
  BOOL bRegistered; !o /=,ZIx  
  BOOL RegisterHotkey(); Eu`|8# [ W  
  UCHAR cKey; 22CET9iCe  
  UCHAR cMask; kJ_8|  
  void DeleteIcon(); [Vo5$w  
  void AddIcon(); T^1 Z_|A  
  UINT nCount; l&qnqmW<  
  void SaveBmp(); Tf86CH=)5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor cl%+m  
  // Dialog Data C}RO'_Pq  
  //{{AFX_DATA(CCaptureDlg) 3x0t[{l  
  enum { IDD = IDD_CAPTURE_DIALOG }; q#W|fkfx+  
  CComboBox m_Key; h= sNj  
  BOOL m_bControl; w*ans}P7  
  BOOL m_bAlt; wfmM`4Y   
  BOOL m_bShift; -d\sKc  
  CString m_Path; "r-P[EKpL  
  CString m_Number; pUXoSnIq:  
  //}}AFX_DATA U-I,Q+[C[^  
  // ClassWizard generated virtual function overrides ?Afe }  
  //{{AFX_VIRTUAL(CCaptureDlg) "0An'7'm  
 public: __g k:a>oQ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -r={P _E6  
 protected: 4#B'pJMw9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y &C b  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "B_3<RSL  
  //}}AFX_VIRTUAL zsg\|=P  
  // Implementation OM*c7&  
 protected: 4 O!2nP  
  HICON m_hIcon; %y6(+I #P  
  // Generated message map functions Qq<@;4  
  //{{AFX_MSG(CCaptureDlg) gc.Lh~  
  virtual BOOL OnInitDialog(); &J>e; X  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); N*o{BboK;  
  afx_msg void OnPaint(); f"ndLX:'}  
  afx_msg HCURSOR OnQueryDragIcon(); q!ZM Wg  
  virtual void OnCancel(); {]T?)!V m  
  afx_msg void OnAbout(); @Vre)OrN#  
  afx_msg void OnBrowse(); ]4l2jY  
  afx_msg void OnChange(); p{g4`o  
 //}}AFX_MSG ??,[-Oi  
 DECLARE_MESSAGE_MAP() }Kp!,  
}; K92j BR  
#endif m4mE7Wn.3  
@8|*Ndx2  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file s?w2^<P  
#include "stdafx.h" |C [!A  
#include "Capture.h" q!$s<n  
#include "CaptureDlg.h" +OE!Uqnt  
#include <windowsx.h> 94"+l@K  
#pragma comment(lib,"hook.lib") hmu>s'  
#ifdef _DEBUG 7Y5r3a}%  
#define new DEBUG_NEW {zwH3)|Hn  
#undef THIS_FILE ngo> ^9/8  
static char THIS_FILE[] = __FILE__; -& 1(~7  
#endif nkW})LyB\  
#define IDM_SHELL WM_USER+1 vI{aF- #  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W [ l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .XJ'2yKof  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1<YoGm&  
class CAboutDlg : public CDialog )+G"57p  
{ K^u,B3  
 public: V`Cy x^P  
  CAboutDlg(); tbFAVGcAM  
  // Dialog Data pU$k{^'UK  
  //{{AFX_DATA(CAboutDlg) sQJ\{'g  
  enum { IDD = IDD_ABOUTBOX }; u m9yO'[C  
  //}}AFX_DATA 'Gy`e-yB  
  // ClassWizard generated virtual function overrides @Rr=uf G  
  //{{AFX_VIRTUAL(CAboutDlg) !5`MiH  
 protected: .-d'*$ yJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J9Ao*IW~  
  //}}AFX_VIRTUAL 1BSd9Ydj  
  // Implementation K*/oWYM]  
 protected: D*M `qPX~  
  //{{AFX_MSG(CAboutDlg) EoAr}fI  
  //}}AFX_MSG J:Cr.K`  
  DECLARE_MESSAGE_MAP() 4t, 2H"M  
}; u<-)C)z  
n{tc{LII/  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5,"c1[`-  
{ 2 XP }:e  
 //{{AFX_DATA_INIT(CAboutDlg) fiGTI}=P  
 //}}AFX_DATA_INIT UA>=# $  
} xfYKUOp/  
PkvW6,lS  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;4nY{)bD  
{ m\&|#yq  
 CDialog::DoDataExchange(pDX); a-{|/ n%  
 //{{AFX_DATA_MAP(CAboutDlg) K10G+'H^  
 //}}AFX_DATA_MAP h `Lr5)B'  
} ;b<w'A_1  
|[SHpcq>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) s L^+$Mq6  
 //{{AFX_MSG_MAP(CAboutDlg) g) Lf^  
 // No message handlers BEDkyz;:  
 //}}AFX_MSG_MAP O~3 A>j  
END_MESSAGE_MAP() ;wn9 21r  
pY31qhoZ.  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) d GUP|O  
: CDialog(CCaptureDlg::IDD, pParent) 0AQ azhm  
{ #])"1fk  
 //{{AFX_DATA_INIT(CCaptureDlg) z`{sD]  
  m_bControl = FALSE; `3;EJDEdbi  
  m_bAlt = FALSE; l6  G6H$  
  m_bShift = FALSE;  LA3m,  
  m_Path = _T("c:\\"); F>fCp  
  m_Number = _T("0 picture captured."); w!F>fcm  
  nCount=0; O_FB^BB  
  bRegistered=FALSE; Nk'<*;e  
  bTray=FALSE; 4MgN  
 //}}AFX_DATA_INIT 5vx 4F f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +_5*4>MC  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); TRhMxH  
} ,P eR}E;c  
I\l&'Q^0@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) V*vQNPe y  
{ -SsgW  
 CDialog::DoDataExchange(pDX); 5X{|*?>T  
 //{{AFX_DATA_MAP(CCaptureDlg) *u},(4Qf  
  DDX_Control(pDX, IDC_KEY, m_Key); m<CrkKfpG  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); f:>y'#P  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 69c4bT:b"  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?;XO1cs  
  DDX_Text(pDX, IDC_PATH, m_Path); Rl?1|$%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .9J^\%JD  
 //}}AFX_DATA_MAP -CvmZ:n  
} dbf<k%i6  
c8uaZvfW  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wWl ?c  
//{{AFX_MSG_MAP(CCaptureDlg) ;s +/'(*  
 ON_WM_SYSCOMMAND() OSBR2Z;=  
 ON_WM_PAINT() M':-f3aT%  
 ON_WM_QUERYDRAGICON() V:\:[KcL^  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `B %%2p&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) v;,W ^#`  
 ON_BN_CLICKED(ID_CHANGE, OnChange) F2N"aQ&  
//}}AFX_MSG_MAP "n%j2"TYJj  
END_MESSAGE_MAP() )N.3Q1g-  
0L}`fYf  
BOOL CCaptureDlg::OnInitDialog() TU|#Pz7n-Z  
{ 2F4<3k! &  
 CDialog::OnInitDialog(); f_c\uN@f  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #-L0.z(  
 ASSERT(IDM_ABOUTBOX < 0xF000); &~:EmLgv  
 CMenu* pSysMenu = GetSystemMenu(FALSE); de:@/-|  
 if (pSysMenu != NULL) f"Sp.'@  
 { 0#V"   
  CString strAboutMenu; be+-p  
  strAboutMenu.LoadString(IDS_ABOUTBOX); l2F#^=tp  
  if (!strAboutMenu.IsEmpty()) E !kN h  
  { '2^}de!E  
   pSysMenu->AppendMenu(MF_SEPARATOR); Phn^0 iF  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;Q{D]4  
  } a\P:jgF  
 } ,DFN:uf=l  
 SetIcon(m_hIcon, TRUE); // Set big icon J!C \R5\  
 SetIcon(m_hIcon, FALSE); // Set small icon @)pC3Vi^  
 m_Key.SetCurSel(0); 9qap#A  
 RegisterHotkey(); >|3Y+X  
 CMenu* pMenu=GetSystemMenu(FALSE); ?!RbS#QV}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); f^pBXz9&=  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); um9&f~M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]it. R-  
 return TRUE; // return TRUE unless you set the focus to a control 7y Cf3  
} ZF>:m>  
-d ,D!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [ja^Bhu  
{ Oo|JIr7i  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) *7AB0y0k  
 { Ii0\Skb  
  CAboutDlg dlgAbout; B^2r4 9vC  
  dlgAbout.DoModal(); 5{=+S]  
 } /\1'.GR  
 else [n"eD4)K|  
 { Xt$qjtVM  
  CDialog::OnSysCommand(nID, lParam); 6wp1jN  
 } ?mNB:-Q  
} 3zsp 6kV  
1>*oN  
void CCaptureDlg::OnPaint() N@thewt|  
{ L?ZSfm2<  
 if (IsIconic()) )@! fLA T  
 { !oH{=.w  
  CPaintDC dc(this); // device context for painting 6 IvAs-%W  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -6)nQNj|  
  // Center icon in client rectangle 2J=`"6c  
  int cxIcon = GetSystemMetrics(SM_CXICON); =%` s-[5b  
  int cyIcon = GetSystemMetrics(SM_CYICON); xP\s^]e  
  CRect rect; P0 0G*iY~\  
  GetClientRect(&rect); :Wbp|:N0  
  int x = (rect.Width() - cxIcon + 1) / 2; ,7V?K j  
  int y = (rect.Height() - cyIcon + 1) / 2; Do4hg $:40  
  // Draw the icon gP>pb W_  
  dc.DrawIcon(x, y, m_hIcon); C@a I*+@-"  
 } vHvz-3  
 else DN%}OcpZ  
 { L } R"1O  
  CDialog::OnPaint(); GvtK=A$b  
 } $}vk+.!*1  
} tav@a)  
cW^LmA  
HCURSOR CCaptureDlg::OnQueryDragIcon() ^_#wo"  
{ q 4Pv\YO  
 return (HCURSOR) m_hIcon; / =9Y(v  
} db 99S   
>_j(uw?u  
void CCaptureDlg::OnCancel() x<I[?GT=  
{ <VZ43I  
 if(bTray) }[leUYi`  
  DeleteIcon(); {XU!p: x  
  CDialog::OnCancel(); //NV_^$y  
} k (AE%eA  
"E+;O,N-  
void CCaptureDlg::OnAbout() w6Gez~ 8  
{ -W!M:8  
 CAboutDlg dlg; YT-ua{ .^  
 dlg.DoModal(); qt9jZtx  
} A{> w5T  
'/`O*KD]  
void CCaptureDlg::OnBrowse() @vq)Y2)r\  
{ T;DKDg a  
 CString str; Q m*z  
 BROWSEINFO bi; 3>n&u,Xe  
 char name[MAX_PATH]; B-g-T>8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 4- QlIIf  
 bi.hwndOwner=GetSafeHwnd(); {aA6b  
 bi.pszDisplayName=name; <,$*(dX)(  
 bi.lpszTitle="Select folder"; ou0TKE9 _  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; OcUj_Zd  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); A@o7  
 if(idl==NULL) .4]XR/I$  
  return; \JPMGcL  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); a=$ZM4Bn  
 str.ReleaseBuffer(); _wXT9`|3  
 m_Path=str; }V ]*FCpQ  
 if(str.GetAt(str.GetLength()-1)!='\\') 0WzoI2Q  
  m_Path+="\\"; 8b0j rt  
 UpdateData(FALSE); L:C/PnIV  
} 1tTP;C l#  
62nmm/c  
void CCaptureDlg::SaveBmp() Kz b-a$  
{ ,m*HRUY  
 CDC dc; yl?LXc[)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Q=! lbW  
 CBitmap bm; I;}U/'RR>  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^+-QY\N j  
 int Height=GetSystemMetrics(SM_CYSCREEN); X8v)yDtw  
 bm.CreateCompatibleBitmap(&dc,Width,Height); a5Vlfx  
 CDC tdc; [? "hmSJ  
 tdc.CreateCompatibleDC(&dc); xJ<RQCW$  
 CBitmap*pOld=tdc.SelectObject(&bm); ^/Hf$tYI!`  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); a;dWM(;Kw  
 tdc.SelectObject(pOld); Yt*NIwWr  
 BITMAP btm; <Z t]V`-  
 bm.GetBitmap(&btm); bq5ySy{8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; < e3] pM  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); L [PqEN\i  
 BITMAPINFOHEADER bih; )'jGf;du  
 bih.biBitCount=btm.bmBitsPixel; q5Zu'-Cx@  
 bih.biClrImportant=0; 6Z1O:Bou  
 bih.biClrUsed=0; `yq) y>_  
 bih.biCompression=0; pS-o*!\C.  
 bih.biHeight=btm.bmHeight; r;b`@ .  
 bih.biPlanes=1; n<|8Onw  
 bih.biSize=sizeof(BITMAPINFOHEADER); gna!Q  
 bih.biSizeImage=size; q=e;P;u  
 bih.biWidth=btm.bmWidth; =P,mix|  
 bih.biXPelsPerMeter=0; q2|x$5  
 bih.biYPelsPerMeter=0; c611&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); IZdWEbN1  
 static int filecount=0; ~*1Z1aZ  
 CString name; OqsuuE  
 name.Format("pict%04d.bmp",filecount++); Q`K^>L1  
 name=m_Path+name; ?VxQ&^|  
 BITMAPFILEHEADER bfh; GR(m+%Vw!  
 bfh.bfReserved1=bfh.bfReserved2=0; %{'[S0@Z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); tYMr  
 bfh.bfSize=54+size; OLF6["0Rn  
 bfh.bfOffBits=54; iLQO .'{U  
 CFile bf; dH0>lV  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ RF8, qz  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 8aQTm- {m  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); uFmpc7  
  bf.WriteHuge(lpData,size); b i-Am/9  
  bf.Close(); ~YNzSkz  
  nCount++; Tq* <J~-  
 } rc:UG "[  
 GlobalFreePtr(lpData); zt]8F)l@  
 if(nCount==1) (=rDt93J  
  m_Number.Format("%d picture captured.",nCount); E\Wd*,/v)  
 else \8*j"@ !H  
  m_Number.Format("%d pictures captured.",nCount); us5Zi#}  
  UpdateData(FALSE); kL s{B  
} %iPIgma  
x$Wtkb0<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) StR)O))I  
{ BGfwgI.m  
 if(pMsg -> message == WM_KEYDOWN) ~Gc@#Msj  
 { >g+Y//Z  
  if(pMsg -> wParam == VK_ESCAPE) ej7N5~!,s  
   return TRUE; +R$;LtR  
  if(pMsg -> wParam == VK_RETURN) AvIheR  
   return TRUE; G@e;ms1  
 } r.@UH-2c  
 return CDialog::PreTranslateMessage(pMsg); h`Ej>O7m  
} QHXpX9  
_eQ-'")  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) SANb g&$  
{ MS2/<LD3d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ F*z>B >{)  
  SaveBmp(); {a>JQW5=  
  return FALSE; #6y fIvap  
} _Q\rZ l  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Pvv7|AV   
 CMenu pop; WSF$xC /~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); = ?/6hB=7<  
 CMenu*pMenu=pop.GetSubMenu(0); .2P3 !KCL  
 pMenu->SetDefaultItem(ID_EXITICON); 7"eIZ  
 CPoint pt; kVeY} 8  
 GetCursorPos(&pt); %;_EWs/z8  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); i5WO)9Us  
 if(id==ID_EXITICON) oN83`Z  
  DeleteIcon(); Ir` l*:j$  
 else if(id==ID_EXIT) -'oxenu  
  OnCancel(); hYFi"ck  
 return FALSE; =JTwH>fD  
} .GYdC '  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); nJgN2Z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) j$u  
 AddIcon(); Pr1OQbg]8  
 return res; cjLA7I.O  
} M_?B*QZJI  
pxbuZ9w2Q  
void CCaptureDlg::AddIcon() I8W9Kzf  
{ #RdcSrw)W!  
 NOTIFYICONDATA data; hOqNZ66{  
 data.cbSize=sizeof(NOTIFYICONDATA); rCGKE`H  
 CString tip; Q[!?SSX%  
 tip.LoadString(IDS_ICONTIP); otdv;xI9  
 data.hIcon=GetIcon(0); ykx13|iR  
 data.hWnd=GetSafeHwnd(); gpbdK?  
 strcpy(data.szTip,tip); Vw.4;Zy(  
 data.uCallbackMessage=IDM_SHELL; FAGi`X<L  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &"1_n]JO  
 data.uID=98; O#^qd0e'P!  
 Shell_NotifyIcon(NIM_ADD,&data); 5M>SrZH  
 ShowWindow(SW_HIDE); FD8  
 bTray=TRUE; 't \sXN+1  
} pP\^bjI   
:-2sKD y  
void CCaptureDlg::DeleteIcon() a[=B?Bd  
{ 5P('SFq'=  
 NOTIFYICONDATA data; NP.qh1{NP  
 data.cbSize=sizeof(NOTIFYICONDATA); 6!U~dt#a  
 data.hWnd=GetSafeHwnd(); E_z,%aD[  
 data.uID=98; ! OVi\v 'm  
 Shell_NotifyIcon(NIM_DELETE,&data); je:J`4k$  
 ShowWindow(SW_SHOW); |<8g 2A{X  
 SetForegroundWindow(); 2fm6G).m  
 ShowWindow(SW_SHOWNORMAL); UBuG12U4Y  
 bTray=FALSE; *MWI`=c  
} {Z$]Rj  
{v3@g[:|  
void CCaptureDlg::OnChange() MzW!iG  
{ a5]]AkvA  
 RegisterHotkey(); Ko0T[TNkh  
} Ej@N}r>X  
t/]za4w/  
BOOL CCaptureDlg::RegisterHotkey() Z 2uU'T  
{ fhHTp_u)2  
 UpdateData(); P6'0:M@5  
 UCHAR mask=0; IxWX2yJ]  
 UCHAR key=0; o:%;AOcl  
 if(m_bControl) PB:r+[91  
  mask|=4; rG B*a8  
 if(m_bAlt) (/P-9<"U  
  mask|=2; V2 }.X+u&<  
 if(m_bShift) &9n=!S'Md  
  mask|=1; ;[,#VtD  
  key=Key_Table[m_Key.GetCurSel()]; 2Aq+:ud)P  
 if(bRegistered){ !uKuO  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :r_/mzR#  
  bRegistered=FALSE; ]V"B`ip[2  
 } U`4t4CHA  
 cMask=mask; Bo*Wm w  
 cKey=key; *u34~v16,  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $yZP"AsAR  
 return bRegistered; 51>OwEf<R  
} ,v*\2oG3^  
m`,h nDp  
  四、小结 BQ~\p\  
gqAN-b'  
  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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