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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: ?jx]%n fV  
  T1LYJ]5  
  一、实现方法 dC11kq qj  
7Cgi&  
  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: N8<J'7%  
)^2eC<t  
#pragma data_seg("shareddata") qd`e:s*%  
HHOOK hHook =NULL; //钩子句柄 >lI7]hbIs  
UINT nHookCount =0; //挂接的程序数目 {SoI;o_>  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 v4$/LUJZp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5]xuU.w'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )uPJ? 2S9  
static int KeyCount =0; d,<ni"  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 NBikYxa  
#pragma data_seg() .~z'm$s1o  
9shf y4?k  
  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。 ]WT@&F  
u9lZHh#V-  
  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: Fq9YhR  
8@3K, [Mo  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR sI ,!+  
cKey,UCHAR cMask) $ Y/9SD  
{ 0;Z|:\P\=  
 BOOL bAdded=FALSE; hI[} -  
 for(int index=0;index<MAX_KEY;index++){ &2'-v@kK  
  if(hCallWnd[index]==0){ tvkdNMyX%9  
   hCallWnd[index]=hWnd; &|v)   
   HotKey[index]=cKey; p/H.bG!z  
   HotKeyMask[index]=cMask; ?gH[la  
   bAdded=TRUE; *~rj!N?;  
   KeyCount++; Q eeV<  
   break; "wUIsuG/p  
  } pYr"3BwG  
 } J<) qw  
 return bAdded; k,h602(  
} d {z[46>  
//删除热键 jhu &Wh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "c^!LV  
{ c`6c)11K  
 BOOL bRemoved=FALSE; %X}ZX|{O  
 for(int index=0;index<MAX_KEY;index++){ X.]I4O&_  
  if(hCallWnd[index]==hWnd){ H]TdW;ZbZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /l$x}  
    hCallWnd[index]=NULL; BK$y>= `  
    HotKey[index]=0; yR}. Xq/  
    HotKeyMask[index]=0; V<ESj K8  
    bRemoved=TRUE; XLh)$rZ  
    KeyCount--; b)w cGBS  
    break; 2u{~35  
   } w)btv{*  
  } n<?U6~F&~  
 } qxL\G &~  
 return bRemoved; 7 qKz_O  
} !_I1=yi  
w5FIHYl6B  
I-#H+\S  
  DLL中的钩子函数如下: F(")ga$r  
hlVye&;b8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }=R]<`Sj.j  
{ \#sD`O  
 BOOL bProcessed=FALSE; 05UN <l]  
 if(HC_ACTION==nCode) F^!D[:;jK  
 { 3m1g"  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 JWVV?~1  
   switch(wParam) -D^I;[j_  
   {   hfB$4s9  
    case VK_MENU: V&Y`?Edc  
     MaskBits&=~ALTBIT; `Rq=:6U;3  
     break; 8|&,JdT  
    case VK_CONTROL: qGk+4 yC  
     MaskBits&=~CTRLBIT; #2Rz=QI  
     break; woI5aee|  
    case VK_SHIFT: =H95?\}T[  
     MaskBits&=~SHIFTBIT; WtSs:D  
     break; K#"=*p,  
    default: //judge the key and send message ,p2UshOmd  
     break; Q*M#e  
   } _3IT3mb2n  
   for(int index=0;index<MAX_KEY;index++){ +qi& ?}  
    if(hCallWnd[index]==NULL) \Ne`9k  
     continue; VQ=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !2!~_*sGe  
    { 7>hcvML  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); unDW2#GX  
     bProcessed=TRUE; 3:nhZN/95T  
    } 4&)sROjV=  
   } MT6p@b5  
  } }D1x%L  
  else if((lParam&0xc000ffff)==1){ //有键按下 +LHU}'|  
   switch(wParam) w\C1Bh!  
   { !z?   
    case VK_MENU: G':3U  
     MaskBits|=ALTBIT; D?Oe";"/  
     break; /<[0o]  
    case VK_CONTROL: X4!93  
     MaskBits|=CTRLBIT; D]]e6gF$e  
     break; |3$E w.  
    case VK_SHIFT: 6@]o,O  
     MaskBits|=SHIFTBIT; "O$bq::(]e  
     break; U1\EwBK8*T  
    default: //judge the key and send message _{|a<Keq|  
     break; fe .=Z&  
   } `$a!CJu,  
   for(int index=0;index<MAX_KEY;index++){ Y1r$;;sH  
    if(hCallWnd[index]==NULL) fy+5i^{=  
     continue; @52#ZWy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XJul~"  
    { ^}  {r@F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G1|1Z5r  
     bProcessed=TRUE; j26i+Z  
    } rrIyZ@_d9  
   } *qpFt Bg  
  } n"iS[uj,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  bPsvoG  
   for(int index=0;index<MAX_KEY;index++){ 4*_jGw  
    if(hCallWnd[index]==NULL) wd:Yy  
     continue;  9q X$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Y S3~sA  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WZa6*pF  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 -TD\?Q  
   } }L0 [ Jo:  
  } (bm^R-SbB  
 } MqJTRBs%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Zo UeLU  
} B*/!s7c.  
wv~:^v'  
  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: @Y0ZW't  
xMbgBx4+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); . !1[I{KU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Whd >  
X5owAc6  
  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: $Sc_E:`]  
_'D(>e?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]p|?S[!=  
{  |q3X#s72  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) t?hfP2&6  
 { x'EEmjJ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Jm!,=} oP'  
  SaveBmp(); ?HG[N7=j  
  return FALSE; Wvl~|Sx]  
 } c b-IRGF  
 …… //其它处理及默认处理 !mv5i%3  
} QN*|_H@h  
'2X$. ^aW  
fz=8"cDR  
  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。 )at:Xm<s  
R*GBxJaw  
  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。 H*]Vs=1  
cGm3LS6]*  
  二、编程步骤 Z/,R{Jgt"  
#91^1jyMf  
  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"; yPE3Awh5  
U\%r33L )  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; kA=5Kc  
kq| !{_  
  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; G#[A'tbKk  
*iB&tWv  
  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; eb7UA=[Z  
{Q>OZm\+  
  5、 添加代码,编译运行程序。 A=kOSq 4Q  
Cab-:2L]  
三、程序代码 1$RJzHS  
J0V m&TY  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL aEdA'>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f2~Aug  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ <T>s;b  
#if _MSC_VER > 1000 MK3h~`is  
#pragma once Y. J!]|  
#endif // _MSC_VER > 1000 \W=3P[gb  
#ifndef __AFXWIN_H__ H!*ypJ  
#error include 'stdafx.h' before including this file for PCH U/'l"N[  
#endif G^B> C  
#include "resource.h" // main symbols RB4n>&Y  
class CHookApp : public CWinApp k86TlQRh  
{ 7"eK<qJ  
 public: 89>}`:xS^  
  CHookApp(); af<h2 r  
  // Overrides np2&W'C/i  
  // ClassWizard generated virtual function overrides p2Khfl6-  
  //{{AFX_VIRTUAL(CHookApp) *AV%=   
 public: mr7Oi `dE  
  virtual BOOL InitInstance(); D>k(#vYKB  
  virtual int ExitInstance(); XQ~Xls%]   
  //}}AFX_VIRTUAL U4 *u|A  
  //{{AFX_MSG(CHookApp) YE@yts  
  // NOTE - the ClassWizard will add and remove member functions here. e-*@R#x8+  
  // DO NOT EDIT what you see in these blocks of generated code ! r10VFaly  
  //}}AFX_MSG CHTK.%AQH!  
  DECLARE_MESSAGE_MAP() n*"r!&Dg  
}; 1\}XL=BE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Z,"4f*2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .Wt3|?\=nd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %%ouf06.|  
BOOL InitHotkey(); (Yz[SK=U}  
BOOL UnInit(); a0hBF4+6  
#endif Sm<*TH!\n_  
~AjPa}@ f  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ]AQ}_dRi=  
#include "stdafx.h" frUs'j/bZ  
#include "hook.h" c\n_[r  
#include <windowsx.h> LxIGPC~  
#ifdef _DEBUG 3w)r""C&  
#define new DEBUG_NEW (s&:D`e  
#undef THIS_FILE S3M!"l  
static char THIS_FILE[] = __FILE__; #OPEYJ;*9d  
#endif gy@=)R/~  
#define MAX_KEY 100 eP" B3Jw  
#define CTRLBIT 0x04  @_f^AQ  
#define ALTBIT 0x02 8#;=>m%  
#define SHIFTBIT 0x01 @<eKk.Y?+  
#pragma data_seg("shareddata") /-v ;  
HHOOK hHook =NULL; G@/iK/>5|`  
UINT nHookCount =0; |!] "y<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey fV4rVy8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT z'l HL  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~;9n6U  
static int KeyCount =0; |K_%]1*riC  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0Xb\w^  
#pragma data_seg() l<XYDb~op  
HINSTANCE hins; ntLEk fK{  
void VerifyWindow(); 8\68NG6o  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !-t w  
//{{AFX_MSG_MAP(CHookApp) _{c_z*rM8  
// NOTE - the ClassWizard will add and remove mapping macros here. ?fH1?Z\'K  
// DO NOT EDIT what you see in these blocks of generated code! cO7ii~&%!  
//}}AFX_MSG_MAP @\nQ{\^;  
END_MESSAGE_MAP() :+6W%B  
q83^?0WD  
CHookApp::CHookApp() ]=t}8H  
{ u `/V1  
 // TODO: add construction code here, +rU{-`dy9'  
 // Place all significant initialization in InitInstance 27 XM&ZrZ  
} ;4!H- qZ  
MlYm\x8{M  
CHookApp theApp; (1|wM+)"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8!|vp7/  
{ \}4Y]xjV2  
 BOOL bProcessed=FALSE; Y Iwa =^  
 if(HC_ACTION==nCode) 0?$|F0U"J  
 { r'Wf4p^Xd  
  if((lParam&0xc0000000)==0xc0000000){// Key up vD@|]@gq  
   switch(wParam) VxDIA_@y  
   { kr+p&|.  
    case VK_MENU: Uk]jy>7;!  
     MaskBits&=~ALTBIT; V<#KFm$>C  
     break; Hmr f\(x  
    case VK_CONTROL: lS9S7`  
     MaskBits&=~CTRLBIT; @=l6zd@  
     break; ~(v5p"]dj  
    case VK_SHIFT: a%.W9=h=M(  
     MaskBits&=~SHIFTBIT; 0e<>2AL   
     break; %d];h  
    default: //judge the key and send message <[\I`kzq  
     break; +# 'w} P  
   } d)1gpRp  
   for(int index=0;index<MAX_KEY;index++){ AE>W$x8P  
    if(hCallWnd[index]==NULL) Bk\Y v0  
     continue; Wz.iDRFl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o3hgkoF   
    { ;Tr,BfV|Bf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5e. aTW;U  
     bProcessed=TRUE; >BO$tbU5b  
    } |hxiARr4  
   } UBuh '?j  
  } :0:Tl/))  
  else if((lParam&0xc000ffff)==1){ //Key down ?'0!>EjY"  
   switch(wParam) eMnK@J  
   { mP\V.^  
    case VK_MENU: .F8[;+  
     MaskBits|=ALTBIT; vY_[@y  
     break; `2]0 X#R  
    case VK_CONTROL: pk9Ics;y  
     MaskBits|=CTRLBIT; KGM__ZO.  
     break; N<i5X.X  
    case VK_SHIFT: Hc'Pp{| X  
     MaskBits|=SHIFTBIT; @U8u6JNK'  
     break; JWd[zJ[  
    default: //judge the key and send message mq[=,,#  
     break; 0Q a 0  
   } Y]L4,V  
   for(int index=0;index<MAX_KEY;index++) avq$aq(3&  
   { `sqr>QD  
    if(hCallWnd[index]==NULL) >\[]z^J  
     continue; OiQf=Uz\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) : wS&3:h  
    { NH|I>vyN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _ cQ '3@  
     bProcessed=TRUE; is8i_FoD,n  
    } vcdVck@  
   } " Bx@(  
  } GIzB1cl:  
  if(!bProcessed){ Op-z"inw  
   for(int index=0;index<MAX_KEY;index++){ (*$F7oO<  
    if(hCallWnd[index]==NULL) 2pdeJ  
     continue; ,5v'hG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =xm7i#1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); IWu=z!mO  
   } q  
  } '(@q"`n  
 } ^+D/59I  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); I`{*QU  
} KbLSK  
$h p UI  
BOOL InitHotkey() %CHw+wT&  
{ +]cf/_8+s  
 if(hHook!=NULL){ } doAeTZ  
  nHookCount++; 3GF67]  
  return TRUE; 2>9\o]ac4  
 } F}So=Jz9h  
 else ]6B9\C.2-_  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); b_RO%L:"yL  
  if(hHook!=NULL) neM.M)0  
   nHookCount++; c`;oV-f  
  return (hHook!=NULL); ]0*aE  
} iSO xQ  
BOOL UnInit() aI&~aezmN  
{ `hO%(9V9  
 if(nHookCount>1){ r1< 'l  
  nHookCount--; yF(9=z"?  
  return TRUE; A#cFO)"  
 } i'li;xUhZ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); B za<.E=  
 if(unhooked==TRUE){ XiTi3vCe  
  nHookCount=0; nrKAK^  
  hHook=NULL; 1"Oe*@`pV  
 } V8 8u -  
 return unhooked; YCiG~y/~  
} n7bVL#Sq[  
76rv$z{g^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X1(ds*'Kv  
{ UUDUd a  
 BOOL bAdded=FALSE; +@?Q"B5u}  
 for(int index=0;index<MAX_KEY;index++){ K9EHT-  
  if(hCallWnd[index]==0){ VQpt1cK*  
   hCallWnd[index]=hWnd; w>j5oz}  
   HotKey[index]=cKey; }d}gb`Du  
   HotKeyMask[index]=cMask; QD,m`7(  
   bAdded=TRUE; k_]'?f7Z  
   KeyCount++; S.`y%t.GP  
   break; !6=s{V&r1  
  } LRHod1}mS  
 } ?\,;KNQr  
 return bAdded; Eh8GqFEM  
} DQY1oM)D !  
.zZfP+Q]8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P?V+<c{  
{ C{/U;Ie-b  
 BOOL bRemoved=FALSE; TNqL ')f  
 for(int index=0;index<MAX_KEY;index++){ 4j3_OUwWZx  
  if(hCallWnd[index]==hWnd){ ivgX o'=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;xiN<f4B  
    hCallWnd[index]=NULL; )8oyo~4?  
    HotKey[index]=0; .t\J @?Z  
    HotKeyMask[index]=0; L;opQ~g  
    bRemoved=TRUE; ra*|HcLD  
    KeyCount--; 6<W^T9}v@/  
    break; h>!h|Ma  
   } :epBd3f  
  } A x8>  
 } >I@&"&d  
 return bRemoved; Q.$8>)  
} OE(y$+L3_I  
D Z*c.|W  
void VerifyWindow() Vwp>:'Pu  
{ y/S3ZJY  
 for(int i=0;i<MAX_KEY;i++){ ;g?PK5rB(  
  if(hCallWnd!=NULL){ Se!w(Y&  
   if(!IsWindow(hCallWnd)){ J'WzEgCnU  
    hCallWnd=NULL; }}k%.Qb  
    HotKey=0; x~}&t+FK  
    HotKeyMask=0; x} =,'Ko}3  
    KeyCount--; wp}Q4I  
   } ys[xR=nbD  
  } ]mtiIu[  
 } ~s&r.6 DW  
} S Yi!%  
X$;x2mz nM  
BOOL CHookApp::InitInstance() ]Y]]X[@  
{ (enr{1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); bMc[0  
 hins=AfxGetInstanceHandle(); Z#u{th  
 InitHotkey(); q'S[TFMNE  
 return CWinApp::InitInstance(); +I uu8t  
} }OIe!  
&,{ >b[  
int CHookApp::ExitInstance() tF,`v{-up  
{ -_9*BvS]R  
 VerifyWindow(); iuWUr?`\  
 UnInit();  cRK Lyb  
 return CWinApp::ExitInstance(); 8OOAPp$%|  
} s2,6aW C  
D6lzc f  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !)oQ9,N  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^"<Bk<b(  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ DC).p'0VL  
#if _MSC_VER > 1000 2<UC^vZ  
#pragma once mQVlE__ub  
#endif // _MSC_VER > 1000 ,1 H|{<  
rYt|[Pk  
class CCaptureDlg : public CDialog kO`!!M[Oo  
{ x_O:IK.>  
 // Construction |(tl a_LE  
 public: "\Dqtr w  
  BOOL bTray; Y!]a*==  
  BOOL bRegistered; }8 ;,2E*z  
  BOOL RegisterHotkey(); H5d@TB, `  
  UCHAR cKey; 56YqYu.  
  UCHAR cMask; ='.b/]!_  
  void DeleteIcon(); 0 J"g"=  
  void AddIcon(); u `ww  
  UINT nCount; l$!ExXEZO;  
  void SaveBmp(); V"8Go;[  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &&$*MHJ  
  // Dialog Data 3-{WFnA  
  //{{AFX_DATA(CCaptureDlg) b&E"r*i|  
  enum { IDD = IDD_CAPTURE_DIALOG }; M3UC9t9]  
  CComboBox m_Key; J0k!&d8  
  BOOL m_bControl; Tr>_R%bK  
  BOOL m_bAlt; wG:RvgX}  
  BOOL m_bShift; <z60E vHg  
  CString m_Path; 7>zUT0SS  
  CString m_Number; [H!do$[>  
  //}}AFX_DATA @P0rNO %y  
  // ClassWizard generated virtual function overrides 5/6Jq  
  //{{AFX_VIRTUAL(CCaptureDlg) N4qBCBr(  
 public: jXmY8||w  
  virtual BOOL PreTranslateMessage(MSG* pMsg); GNHXtu6  
 protected: uUp>N^mmVH  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4#W$5_Ny  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); L}Sb0 o.  
  //}}AFX_VIRTUAL )/!HI0TU  
  // Implementation hyPS 6Y'1  
 protected: ^3vI NF  
  HICON m_hIcon;  ,e 7 ~G  
  // Generated message map functions }t(5n$go6  
  //{{AFX_MSG(CCaptureDlg) KRm)|bgE  
  virtual BOOL OnInitDialog(); 9qi|)!!L  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 07qjWo/t  
  afx_msg void OnPaint(); g@O?0,+1  
  afx_msg HCURSOR OnQueryDragIcon(); ShtV2}s|  
  virtual void OnCancel(); d$\n@}8eZp  
  afx_msg void OnAbout(); 1M)88&  
  afx_msg void OnBrowse(); {gEz;:!):  
  afx_msg void OnChange(); f[NxqNn  
 //}}AFX_MSG G?~Yw'R^8  
 DECLARE_MESSAGE_MAP() #Q_Scxf  
}; 7^.g\Kt?  
#endif ' "%hX&]5  
=saRh)EM  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  fZap\  
#include "stdafx.h" =j w?*  
#include "Capture.h" zvnd@y{[  
#include "CaptureDlg.h" /!5cf;kl*l  
#include <windowsx.h> m_  wvi  
#pragma comment(lib,"hook.lib") OP(om$xm  
#ifdef _DEBUG fi'zk  
#define new DEBUG_NEW LD WYFOGQ  
#undef THIS_FILE sjLm-pn3  
static char THIS_FILE[] = __FILE__; xzx~H>M  
#endif 6e,IjocsB  
#define IDM_SHELL WM_USER+1 mbhh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |w~*p N0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (:H4  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; M?sTz@tqq  
class CAboutDlg : public CDialog .pxUO3g  
{ FS)C<T]t  
 public: 8rBa}v9  
  CAboutDlg(); &-IkM%_A9  
  // Dialog Data S_AN.8T  
  //{{AFX_DATA(CAboutDlg) rx#GrV*y  
  enum { IDD = IDD_ABOUTBOX }; phA{jJy?  
  //}}AFX_DATA OS(Ua  
  // ClassWizard generated virtual function overrides w?fq%-6f*  
  //{{AFX_VIRTUAL(CAboutDlg) R%t6sbsNv  
 protected: R SWw4}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support YuO!Y9iEm  
  //}}AFX_VIRTUAL Cvt/ot-J?  
  // Implementation F` gK6;zp  
 protected: ER!s  
  //{{AFX_MSG(CAboutDlg) .db:mSrL  
  //}}AFX_MSG 2S@Cj{R(  
  DECLARE_MESSAGE_MAP() nYC S %\"  
}; ?: vB_@  
r<dvo%I#|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ~}D"8[ABj  
{ ?*q-u9s9  
 //{{AFX_DATA_INIT(CAboutDlg) rV%;d[LB  
 //}}AFX_DATA_INIT ki `ur%h  
} !8 l &%  
r;waT@&C  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {A MAQ  
{ A$zC$9{0I  
 CDialog::DoDataExchange(pDX); ?56;<%0  
 //{{AFX_DATA_MAP(CAboutDlg) s<C66z  
 //}}AFX_DATA_MAP p)Ht =~  
} F CfU=4O  
W-1Ub |8C  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9-=kVmT&g  
 //{{AFX_MSG_MAP(CAboutDlg) |M?VmG/6  
 // No message handlers m aQDD*  
 //}}AFX_MSG_MAP rc{F17~vX  
END_MESSAGE_MAP() oB!-JX9  
bM W}.v!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *$t=Lh  
: CDialog(CCaptureDlg::IDD, pParent) 7W/55ZTmJ  
{ 1OK~*=/4  
 //{{AFX_DATA_INIT(CCaptureDlg) XS0NjZW  
  m_bControl = FALSE; 6l|SGt\  
  m_bAlt = FALSE; Q^lgtb  
  m_bShift = FALSE; M~saYJio  
  m_Path = _T("c:\\"); R|O^7o  
  m_Number = _T("0 picture captured."); %yVP@M  
  nCount=0; VRv.H8^{  
  bRegistered=FALSE; t<p4H^  
  bTray=FALSE; XPi5E"  
 //}}AFX_DATA_INIT NQbgk+&wD  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Io7 =Mc4  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `Go oSX  
} h&Q-QU  
srU*1jD)  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) :?3y)*J!  
{ $4CsiZ6  
 CDialog::DoDataExchange(pDX); gln X C  
 //{{AFX_DATA_MAP(CCaptureDlg) ~X) 1!Sr  
  DDX_Control(pDX, IDC_KEY, m_Key); 6,p;8I  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); /-ewCCzZV  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Pz'Z n  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); F n*+uk  
  DDX_Text(pDX, IDC_PATH, m_Path); =~$)Ieu  
  DDX_Text(pDX, IDC_NUMBER, m_Number); U4y ?z  
 //}}AFX_DATA_MAP bXWodOSN  
} 3)dtl!VMW[  
=fK F#^E@  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) LgSVEQb6\|  
//{{AFX_MSG_MAP(CCaptureDlg) <qxqlEQT  
 ON_WM_SYSCOMMAND() s(Fxi|v;  
 ON_WM_PAINT() S#ud<=@!9  
 ON_WM_QUERYDRAGICON() ueJ_F#y  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) n]_<6{: U  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) wcDb| H&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +oa>k 0  
//}}AFX_MSG_MAP <;E>1*K}8  
END_MESSAGE_MAP() Z#_VxA>]v  
$olITe"$g  
BOOL CCaptureDlg::OnInitDialog() 7/c9azmC  
{ yuB\Z/  
 CDialog::OnInitDialog(); 8&y3oxA,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); p@=B\A]  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3)~z~p7  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 3%V VG~[  
 if (pSysMenu != NULL) 1GgG9I  
 { V7Mp<x%  
  CString strAboutMenu; Gc:oS vm  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &G!2T!xx  
  if (!strAboutMenu.IsEmpty()) MB(l*ju0  
  { 9Or  
   pSysMenu->AppendMenu(MF_SEPARATOR); ^: V6=  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (qy82F-|2  
  } x4S0C[k  
 } l`<u\],  
 SetIcon(m_hIcon, TRUE); // Set big icon 0o&c8?@j  
 SetIcon(m_hIcon, FALSE); // Set small icon - z"D_5  
 m_Key.SetCurSel(0); l*4_  
 RegisterHotkey(); [- x]%  
 CMenu* pMenu=GetSystemMenu(FALSE); x;>~;vmi  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); E{Y)=tW[  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *}NJ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]`n6H[6O  
 return TRUE; // return TRUE unless you set the focus to a control mwqe@7  
} ew6\Z$1c~  
.Vb\f  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <<ifd?  
{ zE4TdT1y|  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,~xX[uB  
 { 5Og=`T  
  CAboutDlg dlgAbout; A^hFRAg4  
  dlgAbout.DoModal(); hQDZ%>  
 } w}QU;rl8q  
 else -D30(g{O  
 { NYN(2J  
  CDialog::OnSysCommand(nID, lParam); K.2l)aRd  
 } # Q_ d  
} x4bj?=+  
7<3eB)S  
void CCaptureDlg::OnPaint() UZRCJ  
{ C{Er%  
 if (IsIconic()) O'<cEv'B*  
 { g_t1(g*s  
  CPaintDC dc(this); // device context for painting {nlqQ.jO  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x*z$4)RP  
  // Center icon in client rectangle 92K#xM/  
  int cxIcon = GetSystemMetrics(SM_CXICON); \A9hYTC)  
  int cyIcon = GetSystemMetrics(SM_CYICON); p4'Qki8Hd  
  CRect rect; h; 8^vB y  
  GetClientRect(&rect); )o@-h85";  
  int x = (rect.Width() - cxIcon + 1) / 2; }CXL\, ;  
  int y = (rect.Height() - cyIcon + 1) / 2; =M+enSu  
  // Draw the icon )\r;|DN  
  dc.DrawIcon(x, y, m_hIcon); ,~,{$\p   
 } (#;<iu}  
 else a8!/V@a  
 { N=P+b%%:Z  
  CDialog::OnPaint(); F`\7&'I  
 } ZI'Mr:z4  
} an9k2 F.)  
~kAen  
HCURSOR CCaptureDlg::OnQueryDragIcon() \a6knd  
{ {Deg1V!x>  
 return (HCURSOR) m_hIcon; .V:H~  
} $x %VUms  
XQ]5W(EP  
void CCaptureDlg::OnCancel() LxC"j1wfl  
{ F( Iq8DV  
 if(bTray) r% ]^(  
  DeleteIcon(); 6~j.S "  
  CDialog::OnCancel(); 27!9LU  
} QX j4cg  
w$5#jJX\  
void CCaptureDlg::OnAbout() 3d|n\!1r  
{ }TS4D={1  
 CAboutDlg dlg; s&7,gWy}BE  
 dlg.DoModal(); Nn;p1n dN  
} !(EJ.|LH  
7Ed6o  
void CCaptureDlg::OnBrowse() Gf{FFIe(  
{ Tv{X$`%  
 CString str; 4d*=gy%  
 BROWSEINFO bi; H/Fq'FsQB  
 char name[MAX_PATH]; !@x'?+   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #D-L>7,jA  
 bi.hwndOwner=GetSafeHwnd(); -gpF%g`H  
 bi.pszDisplayName=name; IT u6m<V  
 bi.lpszTitle="Select folder"; ,!RbFME&H  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; _DK%-,Spu  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,\BGxGNAmV  
 if(idl==NULL) $m;rOKVU  
  return; KF[P /cFI  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); MH>CCT  
 str.ReleaseBuffer(); >dW~o_u'QN  
 m_Path=str; i$A0_ZJKjZ  
 if(str.GetAt(str.GetLength()-1)!='\\') 0V&6"pF_Y'  
  m_Path+="\\"; ]`2=<n;=  
 UpdateData(FALSE); \*V`w@  
} Z+< zKn}  
k-b0Eogp]  
void CCaptureDlg::SaveBmp() 2vit{  
{ PfI~`ke  
 CDC dc; buRK\C  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); y0R5YCq\":  
 CBitmap bm; 8Jd\2T7h  
 int Width=GetSystemMetrics(SM_CXSCREEN); y:N QLL>  
 int Height=GetSystemMetrics(SM_CYSCREEN); >e7w!v]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ;n Pjyu'g  
 CDC tdc; =2z9Aq{  
 tdc.CreateCompatibleDC(&dc); P%6-W5<  
 CBitmap*pOld=tdc.SelectObject(&bm); + W ? / A]  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :{d?B$  
 tdc.SelectObject(pOld); xJ|3}o:,  
 BITMAP btm; VHJ-v!  
 bm.GetBitmap(&btm); I3A@0'Vm;L  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; S;vE %  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ",\,lqV  
 BITMAPINFOHEADER bih; fBptjt_  
 bih.biBitCount=btm.bmBitsPixel; < xm>_~,w  
 bih.biClrImportant=0; M8 E8r  
 bih.biClrUsed=0; ?2b*F Qe  
 bih.biCompression=0; HY,+;tf2r  
 bih.biHeight=btm.bmHeight; Z2]ySyt]  
 bih.biPlanes=1; `2X#;{a:  
 bih.biSize=sizeof(BITMAPINFOHEADER);  lqO"  
 bih.biSizeImage=size; {o?+T );Z  
 bih.biWidth=btm.bmWidth; 6}YWM]c%  
 bih.biXPelsPerMeter=0; ^&'&Y>  
 bih.biYPelsPerMeter=0; )vFJx[a<n`  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); abq$OI  
 static int filecount=0; $ePBw~yu  
 CString name; I$o^F/RH  
 name.Format("pict%04d.bmp",filecount++); H}OOkzwrA  
 name=m_Path+name; 5V5E,2+ 0  
 BITMAPFILEHEADER bfh; ,haCZH {  
 bfh.bfReserved1=bfh.bfReserved2=0; tH_e?6]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); X`dd"8%  
 bfh.bfSize=54+size; |=7ouFl  
 bfh.bfOffBits=54; K; 7o+Xr  
 CFile bf; (LW4z8e#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 0ivlKe%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^<8 c`k )e  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); / -ebx~FX&  
  bf.WriteHuge(lpData,size); eGZX 6Q7m  
  bf.Close(); FF"6~  
  nCount++; . mDh9V5  
 } OIK14D:  
 GlobalFreePtr(lpData); ,r{[lD^  
 if(nCount==1) ps#+i  
  m_Number.Format("%d picture captured.",nCount); &R54?u^A  
 else 9{?L3V!+r  
  m_Number.Format("%d pictures captured.",nCount); }nDKSC/[V!  
  UpdateData(FALSE); JfmNI~%  
} -uDB#?q:W  
KLI(Rve24  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) '2u(fLq3h  
{ xS) njuq4  
 if(pMsg -> message == WM_KEYDOWN) `.f {V  
 { | fMjg'%{}  
  if(pMsg -> wParam == VK_ESCAPE) c5K@<=?,E  
   return TRUE; =_%i5]89P  
  if(pMsg -> wParam == VK_RETURN) 8]6u]3q#  
   return TRUE; EK^B=)q6:W  
 } ;- D1n  
 return CDialog::PreTranslateMessage(pMsg); bwjjwu&  
} biCX: m+_?  
3Zm'09A-.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -_bHLoI  
{ 6~KtT{MYQ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Ex'6 WN~kD  
  SaveBmp(); %[:\ZwT,-  
  return FALSE; FhZ^/= As  
} i<N[sO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ _~aFzM  
 CMenu pop; I$K?,   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &TqY\l  
 CMenu*pMenu=pop.GetSubMenu(0); $]4>;gTL'  
 pMenu->SetDefaultItem(ID_EXITICON); }QszOi\fV1  
 CPoint pt; Yx21~:9}  
 GetCursorPos(&pt); :"+/M{qz  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %RE-_~GF  
 if(id==ID_EXITICON) |s&jWM$  
  DeleteIcon(); <$#b3F"I  
 else if(id==ID_EXIT) (U"Ub;[7  
  OnCancel(); Y}_J@&:  
 return FALSE; ?dJ-g~  
} {*VCR  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )J?Nfi%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~n:dHK`  
 AddIcon(); ~$1Zw&X  
 return res; -@49Zh2'  
} D-8N Da(`  
P"dWh;I_  
void CCaptureDlg::AddIcon() 5"4O_JQ  
{ 5T?esF<  
 NOTIFYICONDATA data; MTZbRi6z  
 data.cbSize=sizeof(NOTIFYICONDATA); $sDvE~f0n  
 CString tip; N;cEf7+f  
 tip.LoadString(IDS_ICONTIP); I g/SaEF  
 data.hIcon=GetIcon(0); p`// *gl  
 data.hWnd=GetSafeHwnd(); Byf5~OC  
 strcpy(data.szTip,tip); ;[*jLi,uc  
 data.uCallbackMessage=IDM_SHELL; @1#QbNp#  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; jseyT#2  
 data.uID=98; ! 6kLL  
 Shell_NotifyIcon(NIM_ADD,&data);  y{h y  
 ShowWindow(SW_HIDE); +{V"a<D$m  
 bTray=TRUE; q=bW!.#?  
} l MCoc'ae  
_qg)^M6  
void CCaptureDlg::DeleteIcon() *={` %  
{ hLyD#XCFA  
 NOTIFYICONDATA data; 6Q<^,`/T  
 data.cbSize=sizeof(NOTIFYICONDATA); [AzQP!gi  
 data.hWnd=GetSafeHwnd(); i{8T 8  
 data.uID=98; r<]Db&k   
 Shell_NotifyIcon(NIM_DELETE,&data); M)Iu'  
 ShowWindow(SW_SHOW); aRBTuLa)fo  
 SetForegroundWindow(); 6"^Yn.  
 ShowWindow(SW_SHOWNORMAL); 5Xn+cw*  
 bTray=FALSE; 'p=5hsG  
} "mbcZ5 _  
x{Y}1+Y4  
void CCaptureDlg::OnChange() 7XKPC+)1ya  
{ Vv=/{31  
 RegisterHotkey(); AV0m31b  
} %T]NM3|U  
IwC4fcZX6  
BOOL CCaptureDlg::RegisterHotkey() 0be1aY;m&  
{ 8spoDb.S  
 UpdateData(); pkjf5DWp  
 UCHAR mask=0; I@VhxJh  
 UCHAR key=0; iB[>uW  
 if(m_bControl) }m Rus<Ax  
  mask|=4; 3$Ew55  
 if(m_bAlt) "(y",!U@  
  mask|=2; -TKS`,#  
 if(m_bShift) 70p1&Y7or  
  mask|=1; ("{JNA/  
  key=Key_Table[m_Key.GetCurSel()]; <vx/pH)f  
 if(bRegistered){ rrK&XP&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); f,9jK9/$  
  bRegistered=FALSE; (~F{c0 \C  
 } NG-Wn+W@b  
 cMask=mask; fY@Y$S`Fh  
 cKey=key; yjZ]_.  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); cstSLXD  
 return bRegistered; ,1'9l)zP  
} }Z T{  
$:M*$r^u  
  四、小结 Jy)E!{#x  
SVsLu2tVY  
  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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