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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: "USzk7=&.  
  F< 5kcu#iL  
  一、实现方法 nHQ *#&$  
.XRe:\8mc  
  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: i_l{#*t  
Gm9  
#pragma data_seg("shareddata") (NDC9Lls  
HHOOK hHook =NULL; //钩子句柄 J4U_utp  
UINT nHookCount =0; //挂接的程序数目 G51-CLM,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7/k7V)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .3VL  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey %g89eaEZ  
static int KeyCount =0; B!8X?8D  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 eH!V%dX  
#pragma data_seg() {D :WXvI  
2QEH!)lvr  
  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。 |%fNLUJ)  
*A8Et5HAv  
  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: +RR6gAma}<  
:RJo#ape  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR j6$@vA)  
cKey,UCHAR cMask) Qy}pn=#Q  
{ i+< v7?:`#  
 BOOL bAdded=FALSE; T<b* =i  
 for(int index=0;index<MAX_KEY;index++){ yJO Jw o^  
  if(hCallWnd[index]==0){ ~Cw7.NA{3  
   hCallWnd[index]=hWnd; Kng=v~)N'  
   HotKey[index]=cKey; o"z;k3(i$7  
   HotKeyMask[index]=cMask; S')DAx  
   bAdded=TRUE; 0R `>F">  
   KeyCount++; d#$Pf=}  
   break; 5L~lF8  
  } 7+@-mJMP$D  
 } &2[Xu4*  
 return bAdded; u^c/1H:6  
} 9HiyN>(  
//删除热键 X&5N 89  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q=vo5)t   
{ H\E%.QIx  
 BOOL bRemoved=FALSE; v<)&JlR  
 for(int index=0;index<MAX_KEY;index++){ C.LAr~P  
  if(hCallWnd[index]==hWnd){ M5dEZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {D(l#;,iX2  
    hCallWnd[index]=NULL; Qt_KUtD  
    HotKey[index]=0; jq8TfJ|   
    HotKeyMask[index]=0; F2_'U' a  
    bRemoved=TRUE; #f_'&m  
    KeyCount--; h6<i,1gQ1  
    break; ^`aw5 +S  
   } f}4A ,%:1  
  } =2DK?]K;  
 } BhbfPQ  
 return bRemoved; tlg}"lY  
} u2$.EM/iae  
aaN/HE_  
.3n\~Sn  
  DLL中的钩子函数如下: ydY 7 :D  
$UK m[:7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?$tD  
{ `' EG7  
 BOOL bProcessed=FALSE; qdKqc,R1{  
 if(HC_ACTION==nCode) 3XQe? 2:<  
 { 4b`Fi@J\  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 "AKr;|m  
   switch(wParam) \v<S:cTf  
   {  k q?:<!z  
    case VK_MENU: G/fBeK$.  
     MaskBits&=~ALTBIT; uV@' 898%5  
     break; >=:mtcph  
    case VK_CONTROL: M6qNh`+HO  
     MaskBits&=~CTRLBIT; F1B/cd  
     break; Q*1'k%7  
    case VK_SHIFT: 8\:>;XG6f  
     MaskBits&=~SHIFTBIT; 7t}s5}Z 4  
     break; Ygkf}n  
    default: //judge the key and send message ?1 Vx)j>|  
     break; T"C.>G'[B  
   } gGBRfq>  
   for(int index=0;index<MAX_KEY;index++){ aK|  
    if(hCallWnd[index]==NULL) #Yp&yi }  
     continue; +opym!\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hJSWh5]  
    { -b8SaLak  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); VYh/ URU>  
     bProcessed=TRUE; (4yXr|to}  
    } d7QUg 6=  
   } s"w^E\ >6  
  } GE=S.P;  
  else if((lParam&0xc000ffff)==1){ //有键按下 @"/H er  
   switch(wParam) I?%q`GyP5  
   { Qy4Pw\  
    case VK_MENU: ,WnZ^R/n  
     MaskBits|=ALTBIT; '/9MN;_  
     break; /YJBRU2  
    case VK_CONTROL: J&JZYuuf  
     MaskBits|=CTRLBIT; @W @,8e]c  
     break; zw$\d1-+h  
    case VK_SHIFT: I5g|)Y Q  
     MaskBits|=SHIFTBIT; 3="vOSJ6&  
     break; ;!t?*  
    default: //judge the key and send message ^J^FGo|M  
     break; G973n  
   } *14:^neoI  
   for(int index=0;index<MAX_KEY;index++){ #D JZ42  
    if(hCallWnd[index]==NULL) T<Qa`|5 >  
     continue; & ?5)Jis:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B~qo^ppVU  
    { /0|1xHs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); sMUpkU-  
     bProcessed=TRUE; 7F~gA74h  
    } ; qbK[3.  
   } /kRCCs8t}  
  } 52Dgul  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 5A|d hw   
   for(int index=0;index<MAX_KEY;index++){ #Hu# #x|  
    if(hCallWnd[index]==NULL) z-g6d(  
     continue; ;1nXJ{jKw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +|pYu<OY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); gae=+@z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 5T(cy  
   } 7,Z<PE  
  } gV\Y>y4v  
 } ZfVY:U:o>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6|3 X*Orn  
} ohJDu{V  
/%p ~  
  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: _zzNF93Bn  
#=ij</  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8No'8(dPX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <6,,:=#  
 QV\a f  
  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: 6o9&FU  
R;A8y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dvZlkMm   
{ ]F>#0Rdc  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) eK*oV}U-k  
 { K4]ZVMm/*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `D=`xSEYl  
  SaveBmp(); UhkL=+PD  
  return FALSE; ?YV#  K  
 } `T7TWv"M  
 …… //其它处理及默认处理 `l.bU3C  
} I2SH j6 -  
o&z[d  
hDZyFRg  
  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。 v.>K )%`#  
)flm3G2u  
  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。 \awkt!Wa  
,`YBTU  
  二、编程步骤 \QF0(*!!  
D Y4!RjJ47  
  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"; Ct~j/.  
zOFHdd ,"g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; A<TYt M  
Yh@2m9  
  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; A8ef=ljM?  
|4 2;171  
  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; _29wQn@]  
"XLtrAu{  
  5、 添加代码,编译运行程序。 Yl"CIgt  
shy[>\w  
三、程序代码 U@n5:d=  
+c C. ZOS  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 8JF<SQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) >BK/HuS  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Jmg9|g!f  
#if _MSC_VER > 1000 BYhiP/^  
#pragma once (3!6nQj-t  
#endif // _MSC_VER > 1000 N'aq4okoL  
#ifndef __AFXWIN_H__ ]vs}-go  
#error include 'stdafx.h' before including this file for PCH k\j_hu  
#endif "%a<+D  
#include "resource.h" // main symbols %, iAn gF'  
class CHookApp : public CWinApp 5/h-H r  
{ T{`VUS/  
 public: j;z7T;!i  
  CHookApp(); OW@)6   
  // Overrides FeO1%#2<y  
  // ClassWizard generated virtual function overrides  (#O"  
  //{{AFX_VIRTUAL(CHookApp) bqA`oRb\  
 public: V mQ'  
  virtual BOOL InitInstance(); mEi(DW)(  
  virtual int ExitInstance(); &=n/h5e0t&  
  //}}AFX_VIRTUAL %xQ'i4`  
  //{{AFX_MSG(CHookApp) 9y5JV3  
  // NOTE - the ClassWizard will add and remove member functions here. RjO0*$>h  
  // DO NOT EDIT what you see in these blocks of generated code ! !7)#aXt&  
  //}}AFX_MSG }BL7P-km  
  DECLARE_MESSAGE_MAP() cZ)mp`^n7  
}; &nI>`Q'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); PeqW+Q.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3tJfh=r=1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =mPe wx'  
BOOL InitHotkey(); )X|)X,~+-  
BOOL UnInit(); wF%RM$  
#endif fc<y(uX  
$M!iQ"bb  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. w4}Q6_0v  
#include "stdafx.h" K{`R`SXD  
#include "hook.h" q+*\'H>  
#include <windowsx.h> P 6La)U`VA  
#ifdef _DEBUG .QZjJ9pvK  
#define new DEBUG_NEW yE,qLiH  
#undef THIS_FILE ,c?( |tF  
static char THIS_FILE[] = __FILE__; >$- YNZA   
#endif 4cPZGZ{U  
#define MAX_KEY 100 +/RR!vG,  
#define CTRLBIT 0x04 tK/,U =+  
#define ALTBIT 0x02 Jp}\@T.  
#define SHIFTBIT 0x01 Ok{1{EmP  
#pragma data_seg("shareddata")  |:x,|>/  
HHOOK hHook =NULL; YwF&-~mp7n  
UINT nHookCount =0; yZ)9Hd   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey aT}Hc5L,b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Ev7v,7`z  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey cqJXZ.X C  
static int KeyCount =0; E"S# d&9  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift |o9`h9i  
#pragma data_seg() u7RlxA:  
HINSTANCE hins; sP2Uj  
void VerifyWindow(); `sso Wn4  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) W}3%BWn  
//{{AFX_MSG_MAP(CHookApp) %D:VcY9OC  
// NOTE - the ClassWizard will add and remove mapping macros here. S$$SLy:P  
// DO NOT EDIT what you see in these blocks of generated code! #Ktk["6  
//}}AFX_MSG_MAP L97 ~ma  
END_MESSAGE_MAP() :3 Hz!iZM  
2PRiiL@  
CHookApp::CHookApp() d4^x,hzV  
{ =7H\llL4BC  
 // TODO: add construction code here, _&9P&Zf4  
 // Place all significant initialization in InitInstance 6_u!{  
} 7qUg~GJX  
8IxIW0  
CHookApp theApp; ~xsJML  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) m;>G]Sbe  
{ <Lxp t  
 BOOL bProcessed=FALSE; w{xa@Q]t-  
 if(HC_ACTION==nCode) !o?&{"#+  
 { jIrfJ*z  
  if((lParam&0xc0000000)==0xc0000000){// Key up AH/o-$C&  
   switch(wParam) UQ;2g\([  
   { ty"L&$bf  
    case VK_MENU: !m9hL>5vR  
     MaskBits&=~ALTBIT; rEC  
     break; ;|?_C8  
    case VK_CONTROL: @{_X@Wv4iV  
     MaskBits&=~CTRLBIT; 4;AQ12<[1  
     break; :Rv+Bm  
    case VK_SHIFT: D]}~`SO  
     MaskBits&=~SHIFTBIT; h^Yh~84T  
     break; p3mZw lO  
    default: //judge the key and send message {6RA~  
     break; `L7^f!  
   } *n&Sd~Mg  
   for(int index=0;index<MAX_KEY;index++){ PI`Y%!P  
    if(hCallWnd[index]==NULL) |gu@b~8  
     continue; _b-g^#L%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Qb>("j~Z  
    { )uo".n|n~B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3%GsTq2o  
     bProcessed=TRUE; $|J+  
    } Xxd D)I  
   } 6Y,&q|K  
  } MaY_*[  
  else if((lParam&0xc000ffff)==1){ //Key down %$Py@g  
   switch(wParam) B; NK\5>  
   { }s@IQay+  
    case VK_MENU: z;?jKE p  
     MaskBits|=ALTBIT; =>3,]hnep  
     break; O-W[^r2e  
    case VK_CONTROL: Q%?%zuU  
     MaskBits|=CTRLBIT; p!=8Pq.  
     break; er-0i L@  
    case VK_SHIFT: [hg9 0Q6  
     MaskBits|=SHIFTBIT; Kg>B$fBx)  
     break; tKLeq(  
    default: //judge the key and send message MnF|'t  
     break; 2}/r>]9^-  
   } 5EI"5&`*  
   for(int index=0;index<MAX_KEY;index++) id : ^|  
   { 4~$U#$u_  
    if(hCallWnd[index]==NULL) SC4jKm2  
     continue; 5WRqeSGh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CALD7qMK  
    { 7_qsVhh]$E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |ZifrkD=  
     bProcessed=TRUE; =1R 2`H\  
    } =LK`m NA  
   } ;y@zvec4  
  } kJOZ;X=9/  
  if(!bProcessed){ : fYfXm  
   for(int index=0;index<MAX_KEY;index++){ }wv Rs5;o  
    if(hCallWnd[index]==NULL) Gsy>"T{CY  
     continue; y_q1Y70i2r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;R2A>f~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); h>[ qXz  
   } er1X Z  
  } -UzWLVB^  
 } L[*cbjt[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); L&:A59)1k  
} Vraz}JV  
nFGX2|d  
BOOL InitHotkey() ^ /%Y]d$  
{ W|rAn2H  
 if(hHook!=NULL){ 7]5~ml3:  
  nHookCount++; w%)RX<h dI  
  return TRUE; C Q iHk  
 } UukY9n];]  
 else eX"Ecl{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); z@\mn  
  if(hHook!=NULL) vShB26b  
   nHookCount++; =+T0[|gc(r  
  return (hHook!=NULL); ,98 F  
} o_Y?s+~i[/  
BOOL UnInit() US9aW)8  
{ t!J>853  
 if(nHookCount>1){ I/A%3i=H  
  nHookCount--; mdrqX<x'~  
  return TRUE; uTrzC+\aU  
 } }{:}K<  
 BOOL unhooked = UnhookWindowsHookEx(hHook); b3%a4Gg&  
 if(unhooked==TRUE){ Lwf[*n d  
  nHookCount=0; '" &*7)+g*  
  hHook=NULL; W  wj+\  
 } k$J!,!q  
 return unhooked; /=9dX; #  
} 7^! zT  
Xg_l4!T_l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iY2q^z/S  
{ w?nSQBz$  
 BOOL bAdded=FALSE; w;AbJCv2  
 for(int index=0;index<MAX_KEY;index++){ G@jx&#v  
  if(hCallWnd[index]==0){ 4Jc~I  
   hCallWnd[index]=hWnd; 30Qp:_D  
   HotKey[index]=cKey; $qg2@X.  
   HotKeyMask[index]=cMask; pMViq0  
   bAdded=TRUE; Q7v1xBM  
   KeyCount++; iRG6Cw2  
   break; $kmY[FWu?  
  } l"X,[  
 } &c&TQkx  
 return bAdded; D^F=:-l m  
} T9r6,yY  
\?8q&o1=]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &;JeLL1J  
{ p^ROt'eQ<  
 BOOL bRemoved=FALSE; !~'D;Jh  
 for(int index=0;index<MAX_KEY;index++){ 5{1=BZftZ  
  if(hCallWnd[index]==hWnd){ Zn)o@'{}{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ edlf++r~  
    hCallWnd[index]=NULL; J n2QvUAZ&  
    HotKey[index]=0; \' A- Lp  
    HotKeyMask[index]=0; j%]sym  
    bRemoved=TRUE; Rh ]XJM  
    KeyCount--; Qu8=zI>t  
    break; ZDI?"dt{  
   } O6b+eS  
  } w}$;2g0=a<  
 } FrLv%tK|  
 return bRemoved; UEYJd&n0CB  
} C;U4`0=8  
3syA$0TZt  
void VerifyWindow() a;~< iB;3"  
{ /#eS3`48  
 for(int i=0;i<MAX_KEY;i++){ "66#F  
  if(hCallWnd!=NULL){ J[S!<\_!  
   if(!IsWindow(hCallWnd)){ r #w7qEtD  
    hCallWnd=NULL; Z]k@pR !  
    HotKey=0; 4JO 16  
    HotKeyMask=0; !SGRK01  
    KeyCount--; x=x%F;  
   } +s`cXTlFrk  
  } T4ugG?B*  
 } ta x:9j|~  
} Lrr(7cH,  
eIlovq/X  
BOOL CHookApp::InitInstance() LZs'hA<L  
{ oGg<s3;UND  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]E DC s?,  
 hins=AfxGetInstanceHandle(); L 9cXgd  
 InitHotkey(); x6Gl|e[jv  
 return CWinApp::InitInstance(); i$6a0'@U  
} P&tw!B  
*a{WJbau]  
int CHookApp::ExitInstance() /!p}H'jl  
{ ^x^(Rk}|  
 VerifyWindow(); l)jP!k   
 UnInit(); f$dIPt(  
 return CWinApp::ExitInstance();  fWs*u[S  
} Q4]O d{[  
; }ThBb3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file swJQwY   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Y;g\ @j  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =kK%,Mr  
#if _MSC_VER > 1000 `@0AGSzUv  
#pragma once MTNC{:Q  
#endif // _MSC_VER > 1000 , \RR@~u'  
jPx}-_jM  
class CCaptureDlg : public CDialog {L.uLr_?e  
{ _nX8f &  
 // Construction -m ;n}ECg  
 public: 08%Bx~88_%  
  BOOL bTray; K,U8vc  
  BOOL bRegistered; 37jrWe6xwp  
  BOOL RegisterHotkey(); })J}7@VPO  
  UCHAR cKey; =WZ@{z9J  
  UCHAR cMask; !3DY#  
  void DeleteIcon(); }*qj,8-9  
  void AddIcon(); pDvznpQ  
  UINT nCount; AA=eWg  
  void SaveBmp(); Y"m(hs $  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 91q  
  // Dialog Data HGd.meQ  
  //{{AFX_DATA(CCaptureDlg) cJTwgm?  
  enum { IDD = IDD_CAPTURE_DIALOG };  tL<.B  
  CComboBox m_Key; w $`w  
  BOOL m_bControl; ^7=7V0>,:  
  BOOL m_bAlt; '^$+G0jv  
  BOOL m_bShift; @^ m0>H  
  CString m_Path; "{t]~urLd  
  CString m_Number; asCcBp  
  //}}AFX_DATA yg~@} _C2_  
  // ClassWizard generated virtual function overrides n;>=QG -v  
  //{{AFX_VIRTUAL(CCaptureDlg) [/n@BK  
 public: $P%cdJT0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ~$"2,&  
 protected: *BF[thB:a  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L*vKIP<EMM  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); l5KO_"hy  
  //}}AFX_VIRTUAL ]T2Nr[vu  
  // Implementation L<Z,@q `  
 protected: Xw7'I  
  HICON m_hIcon; * >8EMq\^  
  // Generated message map functions I:UDEoQo  
  //{{AFX_MSG(CCaptureDlg)  vP? T  
  virtual BOOL OnInitDialog(); ~gNFcJuy  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {0-rnSjC  
  afx_msg void OnPaint(); x)eoz2E1  
  afx_msg HCURSOR OnQueryDragIcon(); MPw?HpM  
  virtual void OnCancel(); _jg tZ  
  afx_msg void OnAbout(); $7i[7S4  
  afx_msg void OnBrowse(); 3Z&!zSK^  
  afx_msg void OnChange(); FC+h \  
 //}}AFX_MSG #reW)P>  
 DECLARE_MESSAGE_MAP() @' ;.$  
}; HSAr6h  
#endif 6h %rt]g  
wp> z04  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @>V;guJC%  
#include "stdafx.h" 'U0W   
#include "Capture.h" F*>#Xr~/  
#include "CaptureDlg.h" "h7Dye  
#include <windowsx.h> ;ny9q  
#pragma comment(lib,"hook.lib") B<,7!:.II  
#ifdef _DEBUG kOq8zYU|  
#define new DEBUG_NEW >s0![coz  
#undef THIS_FILE i27)c)\BM  
static char THIS_FILE[] = __FILE__; oDi+\0  
#endif Qh-:P`CN  
#define IDM_SHELL WM_USER+1 WY!4^<|w"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f#w u~*c  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1KBGML-K3  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S9r+Nsn  
class CAboutDlg : public CDialog v_WQ<G?  
{ U/|JAg #  
 public: D>HbJCG4^  
  CAboutDlg(); ]yZ%wU9!  
  // Dialog Data *)6\ V}`  
  //{{AFX_DATA(CAboutDlg) ;^E_BJm  
  enum { IDD = IDD_ABOUTBOX }; J.M&Vj:  
  //}}AFX_DATA s;* UP   
  // ClassWizard generated virtual function overrides -V[x q  
  //{{AFX_VIRTUAL(CAboutDlg) VfP\)Rl  
 protected: mw;4/ /R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support m]8*k=v  
  //}}AFX_VIRTUAL |\G^:V[.  
  // Implementation #(i pF  
 protected: ~a&V sC#  
  //{{AFX_MSG(CAboutDlg) ?2dI8bG  
  //}}AFX_MSG ^m&P0  
  DECLARE_MESSAGE_MAP() u#Jr_ze  
}; h& }iH  
i.`n^R;N  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 150-'Q  
{ N fG9a~  
 //{{AFX_DATA_INIT(CAboutDlg) $uyx  
 //}}AFX_DATA_INIT ar}-~~h 5  
} >8=lX`9f{  
0.w7S6v|&  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9:-7.^`P  
{ }f?[m&<  
 CDialog::DoDataExchange(pDX); E]GbLU;TH  
 //{{AFX_DATA_MAP(CAboutDlg) A~<!@`NjB  
 //}}AFX_DATA_MAP [(5.?  
} `&OX|mL^w  
} e+`Kxy  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0`-b57lF&  
 //{{AFX_MSG_MAP(CAboutDlg) DZnqCu"J  
 // No message handlers %DXBl:!Y`  
 //}}AFX_MSG_MAP A8Fe@$<#8  
END_MESSAGE_MAP() Vd  d  
x-X~'p'f  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) BI%XF 9{  
: CDialog(CCaptureDlg::IDD, pParent) #u8#< ,w  
{ =|ODa/2 p  
 //{{AFX_DATA_INIT(CCaptureDlg) [3nWxFz$R  
  m_bControl = FALSE; dr:x0>  
  m_bAlt = FALSE; Xo/H+[;X  
  m_bShift = FALSE; cy;i1#1rO  
  m_Path = _T("c:\\"); vO~  Tx  
  m_Number = _T("0 picture captured."); CE c(2q+%i  
  nCount=0; ]77f`<q<}!  
  bRegistered=FALSE; [WG\w j.  
  bTray=FALSE; *q k7e[IP  
 //}}AFX_DATA_INIT m6n%?8t  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 S)j( %g  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :-JryiI  
} /W BmR R  
n-l_PhPQ`  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) CW?Z\  
{ h@G~' \8t  
 CDialog::DoDataExchange(pDX); LSJ.pBl\X  
 //{{AFX_DATA_MAP(CCaptureDlg) cGgfCF^`  
  DDX_Control(pDX, IDC_KEY, m_Key); c$7~EP  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); gK({InOP  
  DDX_Check(pDX, IDC_ALT, m_bAlt); KU9FHN  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); }YFM4 0H  
  DDX_Text(pDX, IDC_PATH, m_Path); 62zu;p9m  
  DDX_Text(pDX, IDC_NUMBER, m_Number); m} s.a.x  
 //}}AFX_DATA_MAP Rk3 bZvj3  
} AguE)I&m  
/[\g8U{5B}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) yxp,)os:  
//{{AFX_MSG_MAP(CCaptureDlg) :;]9,n  
 ON_WM_SYSCOMMAND() v x/YWZ  
 ON_WM_PAINT() d!0rq4v7  
 ON_WM_QUERYDRAGICON() .7g h2K  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) WK(X/!1/k  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) UgS`{&b36  
 ON_BN_CLICKED(ID_CHANGE, OnChange) x"NQatdq  
//}}AFX_MSG_MAP Ue >]uZ|  
END_MESSAGE_MAP() rpm\!O  
"IT7.!=@9  
BOOL CCaptureDlg::OnInitDialog() %gAT\R_f  
{ Y'i yfnk  
 CDialog::OnInitDialog(); *?HGi>]\ |  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); N\g=9o|Q  
 ASSERT(IDM_ABOUTBOX < 0xF000); Q/ .LDye8  
 CMenu* pSysMenu = GetSystemMenu(FALSE); j_N<aX  
 if (pSysMenu != NULL) j7kX"nz  
 { <a @7's  
  CString strAboutMenu; V@k+RniEO  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .G!xcQ`?  
  if (!strAboutMenu.IsEmpty()) 6Uk+a=Ar  
  { 4hwb] Yz  
   pSysMenu->AppendMenu(MF_SEPARATOR); J#F5by%8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *0!p_Hco  
  } Hf]:m hH  
 } :#^qn|{e  
 SetIcon(m_hIcon, TRUE); // Set big icon u5k {.&  
 SetIcon(m_hIcon, FALSE); // Set small icon P{6$".kIY  
 m_Key.SetCurSel(0); Rq5'=L  
 RegisterHotkey(); s~A-qG>  
 CMenu* pMenu=GetSystemMenu(FALSE); Lxv4w  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); goIv m:?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~. vridH  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); S1U0sP@o  
 return TRUE; // return TRUE unless you set the focus to a control (!5Ta7X  
} JpC=ACF  
eb\SpdM6  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) S7f.^8  
{ e>Z&0lV:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) nWIZ0Nde'  
 { .c+U=bV-  
  CAboutDlg dlgAbout; w>^(w<~Y  
  dlgAbout.DoModal(); B\c_GXUw  
 } \~E?;q!  
 else WT<}3(S'?  
 { v-3VzAd=*&  
  CDialog::OnSysCommand(nID, lParam); K_)~&Cu*'  
 } Yjc U2S"=P  
} 7b>_vtrt  
WK`o3ayH-  
void CCaptureDlg::OnPaint() M8X6!"B$Y  
{ & mOn]  
 if (IsIconic()) rAu% bF  
 { -!1=S: S  
  CPaintDC dc(this); // device context for painting u NyN[U  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `5?0yXK  
  // Center icon in client rectangle `z(o01y  
  int cxIcon = GetSystemMetrics(SM_CXICON); CsA(oX  
  int cyIcon = GetSystemMetrics(SM_CYICON); vu*e*b$}  
  CRect rect; 2lpPN[~d  
  GetClientRect(&rect); ))|d~m  
  int x = (rect.Width() - cxIcon + 1) / 2; /GO-  
  int y = (rect.Height() - cyIcon + 1) / 2; F%|P#CaB  
  // Draw the icon W-s6+ DY  
  dc.DrawIcon(x, y, m_hIcon); N<rq}^qo  
 } lfHN_fE>Mq  
 else 7s?#y=M  
 { ?uSoJM`wa!  
  CDialog::OnPaint(); FAdTm#tgW]  
 } . f ja;aG  
} e+lun -  
M\m:H3[  
HCURSOR CCaptureDlg::OnQueryDragIcon() `CS\"|z  
{ FE!jN-#  
 return (HCURSOR) m_hIcon; Ur xiaE  
} {q)d  
H_RfIX)X  
void CCaptureDlg::OnCancel() iN Oj @3x  
{ w<`0D)mQ  
 if(bTray) I2$DlEke  
  DeleteIcon(); {k3ItGQ_  
  CDialog::OnCancel(); =m2_:&@0x  
} W:RjWn@<  
2~$S @c  
void CCaptureDlg::OnAbout() ),p0V  
{ M/p9 I gp  
 CAboutDlg dlg; r&4Xf# QD6  
 dlg.DoModal(); =;0-t\w!  
} 'r]6 GC8Z$  
Z8$BgP  
void CCaptureDlg::OnBrowse() R BHDfm'~7  
{ P! +Gwm{  
 CString str; z;1dMQ,#  
 BROWSEINFO bi; ]!{S2x&"  
 char name[MAX_PATH]; ]M*`Y[5"  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); I:TbZ*vi~  
 bi.hwndOwner=GetSafeHwnd(); "Wg,]$IvU  
 bi.pszDisplayName=name; :1*E5pX0n  
 bi.lpszTitle="Select folder"; $VHIU1JjZ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -orRmn6}  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ) 1AAL0F\B  
 if(idl==NULL) F9j@KC(yg  
  return; tC'E#2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); BwWSztJ+B  
 str.ReleaseBuffer(); NF8<9  
 m_Path=str; )%@7tx  
 if(str.GetAt(str.GetLength()-1)!='\\') %JE>Z]  
  m_Path+="\\"; xkDK5&V  
 UpdateData(FALSE); \PxT47[@e  
} N=\ zx^w,  
eTp|!T  
void CCaptureDlg::SaveBmp() Nf )YG!  
{ v=@y7P1  
 CDC dc; r5~ W/eE  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); @bA5uY!  
 CBitmap bm; $@'BB=i  
 int Width=GetSystemMetrics(SM_CXSCREEN); X3}eq|r9  
 int Height=GetSystemMetrics(SM_CYSCREEN); \:J=tAC  
 bm.CreateCompatibleBitmap(&dc,Width,Height); X+]>pA  
 CDC tdc; lZ-U/$od  
 tdc.CreateCompatibleDC(&dc); S3Y.+. 0U  
 CBitmap*pOld=tdc.SelectObject(&bm); GmR3 a  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); e El)wZ,A  
 tdc.SelectObject(pOld); H7tv iSTd  
 BITMAP btm; jvB[bS`<H  
 bm.GetBitmap(&btm); U)8yd,qG[%  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .m]}Ba}J$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); pZ>yBY?R8>  
 BITMAPINFOHEADER bih; [o<hQ`&  
 bih.biBitCount=btm.bmBitsPixel; v>wN O  
 bih.biClrImportant=0; q|<B9Jk  
 bih.biClrUsed=0; } 8 z:L<  
 bih.biCompression=0; 'w=|uE {^  
 bih.biHeight=btm.bmHeight; !0@4*>n  
 bih.biPlanes=1; o9e8Oj&  
 bih.biSize=sizeof(BITMAPINFOHEADER); T9V=#+8#"  
 bih.biSizeImage=size; Bn]=T  
 bih.biWidth=btm.bmWidth; E_=F' sP?  
 bih.biXPelsPerMeter=0; jXeE]A"  
 bih.biYPelsPerMeter=0; T>asH  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); .1[.f}g$J  
 static int filecount=0; '{2]:  
 CString name; S#M8}+ZD,  
 name.Format("pict%04d.bmp",filecount++); ,)[9RgsE  
 name=m_Path+name; b$DiDm  
 BITMAPFILEHEADER bfh; U&#` <R_0  
 bfh.bfReserved1=bfh.bfReserved2=0; VP A+/5TW  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 9\.0v{&v  
 bfh.bfSize=54+size; eI:[o  
 bfh.bfOffBits=54; ? #rXc%F  
 CFile bf; oY^I|FEOz  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Yc]V+NxxQ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); |2l-s 1|y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -0CBMoe  
  bf.WriteHuge(lpData,size); INr1bAe$  
  bf.Close(); teS>t!d  
  nCount++; "/6#Z>y  
 } 1k6asz^T  
 GlobalFreePtr(lpData); 5Qq/nUR  
 if(nCount==1) {C 5:as  
  m_Number.Format("%d picture captured.",nCount); eP]y\S*P  
 else 7.Y;nem:(  
  m_Number.Format("%d pictures captured.",nCount); HZAT_  
  UpdateData(FALSE); 'l^Bb#)"  
} vm|u~Yd,s  
+H3~Infr4f  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) `;}`>!8j  
{ A:(|"<lA  
 if(pMsg -> message == WM_KEYDOWN) Sn*s@RE\s  
 { q?7''xk7  
  if(pMsg -> wParam == VK_ESCAPE) xZ {6!=4!  
   return TRUE; 0E26J@jcZ7  
  if(pMsg -> wParam == VK_RETURN) ="$w8iRU  
   return TRUE; 67rY+u%  
 } )<V!lsUx'-  
 return CDialog::PreTranslateMessage(pMsg); &Gh,ROo4  
} mj'~-$5T  
h7+"*fN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vx<{cHQQ  
{ ;9j ]P56  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +=J $:/&U  
  SaveBmp(); r[V%DU$dj  
  return FALSE; &5-1Cd E  
} anW['!T9{s  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~Yd[&vpQ  
 CMenu pop; 29J|eBvxx  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5.5kH$;>  
 CMenu*pMenu=pop.GetSubMenu(0); |/K| Vwa  
 pMenu->SetDefaultItem(ID_EXITICON); l{7}3Am6  
 CPoint pt; hn2:@^=f  
 GetCursorPos(&pt); .F7?}8>Z  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); w0g@ <( 3  
 if(id==ID_EXITICON) $Xwk8<  
  DeleteIcon(); _\d|`3RM  
 else if(id==ID_EXIT) @FIL4sb  
  OnCancel(); #[M^Q h  
 return FALSE; ywp_,j9F  
} fSbLkd 9  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); j:cu;6|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)  t/t6o&  
 AddIcon(); #|E#Rkw!  
 return res; 6ZI Pe~`  
} 01@ WU1IN  
S Q:H2vvD  
void CCaptureDlg::AddIcon() :0y-n.-{  
{ >!1] G"U  
 NOTIFYICONDATA data;  s;bGg  
 data.cbSize=sizeof(NOTIFYICONDATA); AHs%?5YTY;  
 CString tip; y<6Sl6l*  
 tip.LoadString(IDS_ICONTIP); *N$XQ{o  
 data.hIcon=GetIcon(0); u;9iuc` *  
 data.hWnd=GetSafeHwnd(); Mk#r_:[BS  
 strcpy(data.szTip,tip); Mi.2 >  
 data.uCallbackMessage=IDM_SHELL; I?D=Q $s  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  ="]r{  
 data.uID=98; .<QKQ%-  
 Shell_NotifyIcon(NIM_ADD,&data); sd\}M{U  
 ShowWindow(SW_HIDE); =iW hK~S  
 bTray=TRUE; RCTqV.L  
} CfW#Wk:8J  
%6(\Ki6I  
void CCaptureDlg::DeleteIcon() =k<b* 8  
{ O;4S<N  
 NOTIFYICONDATA data; R^`}DlHX  
 data.cbSize=sizeof(NOTIFYICONDATA); #"6l+}  
 data.hWnd=GetSafeHwnd(); :i>LESJq  
 data.uID=98; #tZ!D^GQHq  
 Shell_NotifyIcon(NIM_DELETE,&data); 6%p6BK6  
 ShowWindow(SW_SHOW); ?:/J8s [O  
 SetForegroundWindow(); ]uFJ~ :R  
 ShowWindow(SW_SHOWNORMAL); ti GH#~?  
 bTray=FALSE; pHR`%2!"t  
} \ R}I4'  
$DH/  
void CCaptureDlg::OnChange() U $#^ e  
{ 2#$7!`6 K  
 RegisterHotkey(); *1v3x:pQ'  
} s@~3L  
`Zuo`GP*1  
BOOL CCaptureDlg::RegisterHotkey() Bs0~P 4^  
{ i +@avoW  
 UpdateData(); aW:*!d#  
 UCHAR mask=0; >AV9 K  
 UCHAR key=0; 3q/"4D  
 if(m_bControl) g.Ur~5r  
  mask|=4; G0: <#?<5  
 if(m_bAlt) w@2NXcmw  
  mask|=2; w +UB XW  
 if(m_bShift) D A=LR  
  mask|=1; W\B@0Iso  
  key=Key_Table[m_Key.GetCurSel()]; DOtz  
 if(bRegistered){ H$?MPA-c  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); W:<2" &7  
  bRegistered=FALSE; ,+BFpN'  
 } *8qRdI9  
 cMask=mask; RQ|K?^k v  
 cKey=key; a?Fz&BE  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1y[~xxgE  
 return bRegistered; R|Bi%q|4P  
} t@lTA>;U@  
" AvEo  
  四、小结 i8Be%y%y  
A* qR<cp[  
  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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