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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: rjq -ZrC%  
  b#bO=T$e-  
  一、实现方法 89 _&X[X  
#MmmwPB_  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: J$o[$G_Z  
Nj! R9N  
#pragma data_seg("shareddata") j(wY/Hl  
HHOOK hHook =NULL; //钩子句柄 :/I={)5  
UINT nHookCount =0; //挂接的程序数目 n:%'{}Jw  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 aTmX!!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Zb5T90s%  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey e!O &~#'h}  
static int KeyCount =0; (cbB %  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 X7(rg W8  
#pragma data_seg() >EPaZp6  
i[V,IP +  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 BbXmT"@  
^v()iF !  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: \J#I}-a&j  
'eTpcrS3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR dA3`b*nC  
cKey,UCHAR cMask) 4c493QOd  
{ r-Xjy*T  
 BOOL bAdded=FALSE; R$~JhcX*l'  
 for(int index=0;index<MAX_KEY;index++){ ZVCv(J  
  if(hCallWnd[index]==0){ JC1BUheeb  
   hCallWnd[index]=hWnd; Y+S~b  
   HotKey[index]=cKey; ^^U)WB  
   HotKeyMask[index]=cMask; D(W7O>5vQ2  
   bAdded=TRUE; t/4/G']W  
   KeyCount++; )[a?J,  
   break; M $E8:  
  } [bQ8A(u  
 } ^+YGSg7  
 return bAdded; [xH2n\7  
} IWSEssP  
//删除热键 m"k i*9]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2g`uC}  
{ 6M2i? c  
 BOOL bRemoved=FALSE; Xlgz.j7XR  
 for(int index=0;index<MAX_KEY;index++){ .-gm"lB  
  if(hCallWnd[index]==hWnd){ WoN]eO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B%?|br  
    hCallWnd[index]=NULL; o F,R@f  
    HotKey[index]=0; l%3Q=c  
    HotKeyMask[index]=0; dRarNW  
    bRemoved=TRUE; `\}zm~  
    KeyCount--; )xXrs^  
    break; ./z"P]$  
   } *HfW(C$  
  } }T&;*ww  
 } }sm56}_  
 return bRemoved; 3n=cw2FG  
} c'VtRE# z~  
p5D3J[?N  
s2 t-T0;  
  DLL中的钩子函数如下: wHDF TIDI  
vFkyfX(   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) mSqk[ Ig\  
{ _@}MGWlAPt  
 BOOL bProcessed=FALSE; <CdG[Ih  
 if(HC_ACTION==nCode) Y=#mx3.  
 { L>K39z~,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 n$Oky-P"  
   switch(wParam) d%"@#bB  
   {  {yl/T:Bh&  
    case VK_MENU: `~s,W.Eu4  
     MaskBits&=~ALTBIT; _<&K]e@dp  
     break; 7xa@wa?!L  
    case VK_CONTROL: >H]|A<9u(  
     MaskBits&=~CTRLBIT; Q{)F$]w  
     break; CuGOjQ-k~  
    case VK_SHIFT: A/W7 ;D  
     MaskBits&=~SHIFTBIT; {e!uvz,e  
     break; ps4Wwk(  
    default: //judge the key and send message B[k+#YYY  
     break; AF{7<v>/P  
   } 2&G1Q'!  
   for(int index=0;index<MAX_KEY;index++){ 0 Ci"tA3"  
    if(hCallWnd[index]==NULL) QI^8b\36  
     continue; <]SS gQ9/"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q2"'W|I  
    { `'{%szmD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); gx{~5&1  
     bProcessed=TRUE; L@x8hUG"  
    } 9 h{:!  
   } "$wPq@  
  } r z>zdj5}  
  else if((lParam&0xc000ffff)==1){ //有键按下 Y+5A2Z)f[  
   switch(wParam) pOe`*2[  
   { )}g4Rvr  
    case VK_MENU: `cTsS  
     MaskBits|=ALTBIT; ($ 1<Dj:  
     break; Z[A|SyZp  
    case VK_CONTROL: M#gGD-  
     MaskBits|=CTRLBIT; 5 <>agK]  
     break; ?tM].\  
    case VK_SHIFT: T"0)%k8lJ  
     MaskBits|=SHIFTBIT; oKqFZ,m[  
     break; `EW_pwZPA  
    default: //judge the key and send message 113x9+w[  
     break; , $F0D  
   } jH#^O ;A  
   for(int index=0;index<MAX_KEY;index++){ NX #/1=  
    if(hCallWnd[index]==NULL) ;ZW}47:BS6  
     continue; >[3,qP]E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "rlSK >`  
    { R@{/$p:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .}u(&  
     bProcessed=TRUE; U=<.P;+f9  
    } -W"0,.Dvg  
   } "a_D]D(d5  
  } i1H80m s  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 QcVtv7+*v  
   for(int index=0;index<MAX_KEY;index++){ N[D\@o  
    if(hCallWnd[index]==NULL) o[+|n[aT)3  
     continue; V5^b6$R@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) OU964vv  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,0u0 '  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 R~?;KJ  
   } CjukD%>sde  
  } oL/^[TXjH  
 } .mU.eLM  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); NGeeD?2~  
} B0SmE_u_N  
Ej3hdi)  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 4oEq,o_  
u$ / ]59  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g"AfI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '-~/!i+=  
^+l\YB7pD  
  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: ?01""Om   
vpw&"?T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "+ JwS  
{ $}c@S0%P"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 9%k.GE  
 { OU5|m%CmO  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7 QJcRZ[lU  
  SaveBmp(); :^L]Da3  
  return FALSE; cNB$g )`  
 } $Lbe5d?\  
 …… //其它处理及默认处理 +g7nM7,1a  
} %Yn)t3d  
av$_hEjo|D  
= y,avR  
  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^a"1|  
"jJ)hk5e  
  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。 [<I `slK  
zi&d  
  二、编程步骤 <UL|%9=~  
9<r}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"; #.t{g8W\C  
Y,"MQFr(o  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; *U^hwL  
2cL )sP}  
  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; NKh {iSLm  
~"YNG?Rre  
  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; bHT@]`@@  
%hb5C 4q  
  5、 添加代码,编译运行程序。 RL)3k8pk  
4'=N{.TtO  
三、程序代码 ._nKM5.  
>o= p5#{  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL .v&h>@'m  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) nY0UnlB`  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,DO mh<b  
#if _MSC_VER > 1000 |6Z M xY  
#pragma once U: jf9L2  
#endif // _MSC_VER > 1000 h4i $z-!  
#ifndef __AFXWIN_H__ +E[)@;T  
#error include 'stdafx.h' before including this file for PCH w[G_w:$a  
#endif ~,1q :Kue  
#include "resource.h" // main symbols )t=u(:u]  
class CHookApp : public CWinApp {EN@,3bA  
{ 0>MI*fnY"  
 public: }f'1x%RS^  
  CHookApp(); j}*+-.YF  
  // Overrides ,#O8:s  
  // ClassWizard generated virtual function overrides ?C2;:ol  
  //{{AFX_VIRTUAL(CHookApp) j7+t@DqQ  
 public: kw}1CXD  
  virtual BOOL InitInstance(); 4^^rOi0  
  virtual int ExitInstance(); u\?u4  
  //}}AFX_VIRTUAL eV%bJkt.  
  //{{AFX_MSG(CHookApp) i)3\jO0&GU  
  // NOTE - the ClassWizard will add and remove member functions here. ghj~r  
  // DO NOT EDIT what you see in these blocks of generated code ! rB?cm]G=  
  //}}AFX_MSG 6x{IY  
  DECLARE_MESSAGE_MAP() :J-5Q]#  
}; l!` 0I] }  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); * XGBym  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @&B!P3{f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~l6Y<-!  
BOOL InitHotkey(); 9v2 ;  
BOOL UnInit(); [![ (h %  
#endif A\.*+k/B  
!c($C   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _If?&KJ r  
#include "stdafx.h" Vatt9  
#include "hook.h" R!qrb26k  
#include <windowsx.h> (W!$6+GT  
#ifdef _DEBUG [0#hgGO]P  
#define new DEBUG_NEW mhuaXbr  
#undef THIS_FILE ;VRR=p%,  
static char THIS_FILE[] = __FILE__; 5^/[]*  
#endif e_-/p`9  
#define MAX_KEY 100 {jf~?/<  
#define CTRLBIT 0x04 ptQ (7N  
#define ALTBIT 0x02 &2igX?60  
#define SHIFTBIT 0x01 ;)a9Y?  
#pragma data_seg("shareddata") -"H4brj;G  
HHOOK hHook =NULL; eR`<9KBH  
UINT nHookCount =0; 3~la/$?p0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey b15qy?`y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT j #YFwX4.  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey f|0QN#$  
static int KeyCount =0; 4pT|r6!<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift =fo/+m5  
#pragma data_seg() gAP}KR#T  
HINSTANCE hins; ,+9r/}K]/  
void VerifyWindow();  gV kI=J  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) uJ[Vv4N%9  
//{{AFX_MSG_MAP(CHookApp) xrnH= >.;m  
// NOTE - the ClassWizard will add and remove mapping macros here. Y1\vt+`O  
// DO NOT EDIT what you see in these blocks of generated code! AgJ~6tK  
//}}AFX_MSG_MAP %T\x~)  
END_MESSAGE_MAP() >6+K"J-@  
8l0 (6x$  
CHookApp::CHookApp() X+8p2xSO|  
{ BB$>h-M/%#  
 // TODO: add construction code here, }}1Q<puM  
 // Place all significant initialization in InitInstance V}-o): dI|  
} -~fI|A^  
Y_sVe  
CHookApp theApp; ] '/]j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R2W_/fsG  
{ -+_&#twU  
 BOOL bProcessed=FALSE; ;$< ek(i7  
 if(HC_ACTION==nCode) }wXD%X@)l  
 { 4N j?UDa  
  if((lParam&0xc0000000)==0xc0000000){// Key up )7J>:9h  
   switch(wParam) 5zOSb$;  
   { B,,d~\  
    case VK_MENU: >,Z{wxz J  
     MaskBits&=~ALTBIT; -+|[0hpw  
     break; v1)6")8o+  
    case VK_CONTROL: E2D8s=r  
     MaskBits&=~CTRLBIT; qw1J{xoHW  
     break; <vDm(-i3  
    case VK_SHIFT: ?%Fk0E#>2  
     MaskBits&=~SHIFTBIT; UULL:vqq  
     break; =:eE!  
    default: //judge the key and send message z?[DW*  
     break; GY xI$y0:  
   } zX`RN )C  
   for(int index=0;index<MAX_KEY;index++){ F9w&!yW:  
    if(hCallWnd[index]==NULL) KW^aARJ)  
     continue; a0\UL"z#+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !yrHVc  
    { 06 s3 b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g<%-n,  
     bProcessed=TRUE; 12dW:#[  
    } |"v{RC0  
   } n^#LB*q  
  } q(^J7M)  
  else if((lParam&0xc000ffff)==1){ //Key down i{qURP}.  
   switch(wParam) !3# }ZC2  
   { "s9gQAoaO  
    case VK_MENU: ZQA C &:  
     MaskBits|=ALTBIT; 5&= n  
     break; )W|jt/  
    case VK_CONTROL: p>3'77 V  
     MaskBits|=CTRLBIT; mC(t;{  
     break; ><c5Humr  
    case VK_SHIFT: 3 ?~+5DU  
     MaskBits|=SHIFTBIT; WEAXqDjM  
     break; +Ob#3PRy  
    default: //judge the key and send message );H[lKy  
     break; >nEnX  
   } T]-~?;Jh8  
   for(int index=0;index<MAX_KEY;index++) [)vwg`]   
   { *PU,Rc()6  
    if(hCallWnd[index]==NULL) w[YbL2p  
     continue; 5T#D5Z<m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RQNi&zX/  
    { 4LJ}>e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q}]kw}b  
     bProcessed=TRUE; j],.`Y  
    } tta0sJ8 i  
   } ] Nipo'N;  
  } aZ`ags ofk  
  if(!bProcessed){ $VIq)s2az|  
   for(int index=0;index<MAX_KEY;index++){ I]1Hi?A2  
    if(hCallWnd[index]==NULL) |9$'?4F  
     continue; N o\&~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j88sE MZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Fxx2vTV4ag  
   } w{EU9C  
  } B?Sfcq-  
 } 6FMW g:{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F@roQQu  
} Nj&%xe>].  
'$-,;vnP0  
BOOL InitHotkey() pY#EXZ#   
{ +Z2<spqG  
 if(hHook!=NULL){ KXCmCn  
  nHookCount++; Q9tE^d+%  
  return TRUE; ^QR'yt3e  
 } ;o459L>sW  
 else Kg-X]yu*0  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); i9U_r._qj;  
  if(hHook!=NULL) G<6grd5PP  
   nHookCount++; LlY*r+Cgl1  
  return (hHook!=NULL); }(EOQ2TI  
} z}2e;d 7  
BOOL UnInit() WTs[Sud/  
{ G11.6]?Gg  
 if(nHookCount>1){ \&)W#8V  
  nHookCount--; #gJ~ {tA:  
  return TRUE; lNVAKwW2#  
 } l5]oS? >y  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Er1u1@  
 if(unhooked==TRUE){ u;qMo`-  
  nHookCount=0; ~(OIo7#;  
  hHook=NULL; rGGepd  
 } 05I39/T%  
 return unhooked; A=]F_  
} - :z5m+  
4@iJ|l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G5y  
{ cGzYW~K  
 BOOL bAdded=FALSE; nYt\e]3  
 for(int index=0;index<MAX_KEY;index++){ H-KwkH`L4  
  if(hCallWnd[index]==0){ _D,f 4.R  
   hCallWnd[index]=hWnd; mX.3R+t  
   HotKey[index]=cKey; VD3MJ8!w  
   HotKeyMask[index]=cMask; %7d@+ .  
   bAdded=TRUE; 3b\8907  
   KeyCount++; mCNf]Yz  
   break; 33*d/%N9  
  } aX'g9E  
 } x$ J.SbW  
 return bAdded; jNG?2/P6&  
} 1(7.V-(G  
'qF3,Rw  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TKu68/\)  
{ q&d&#3Rh  
 BOOL bRemoved=FALSE; 3H}~eEg,  
 for(int index=0;index<MAX_KEY;index++){ }>X\"  
  if(hCallWnd[index]==hWnd){ Q>a7Ps@~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L[Yp\[#-q  
    hCallWnd[index]=NULL; {F+M&+``  
    HotKey[index]=0; s?x>Yl %  
    HotKeyMask[index]=0; 'BdmFKy1  
    bRemoved=TRUE; oT (:33$  
    KeyCount--; +[8Kl=]L  
    break; Y!1^@;)^  
   } cm 9oG  
  } VIYksv   
 } P[GX}~_k  
 return bRemoved; /\a]S:V-j  
} )cqDvH  
2]aZe4H.  
void VerifyWindow() LLn{2,jfQ  
{ nHA`B.:B  
 for(int i=0;i<MAX_KEY;i++){ tGO[A#9a  
  if(hCallWnd!=NULL){ ^8oc^LOa~2  
   if(!IsWindow(hCallWnd)){ hp]ng!I{\u  
    hCallWnd=NULL; Jt>[]g$  
    HotKey=0; P`3s\8[Q  
    HotKeyMask=0; `\F%l?aY  
    KeyCount--; ,*nZf|  
   } g y e(/N+I  
  } <.=#EV^i  
 } QTjftcu  
} <V:<x  
x\J;ZiWwW  
BOOL CHookApp::InitInstance() 4$zFR}f  
{ ZkB6bji  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zdjM%l);  
 hins=AfxGetInstanceHandle(); {~p7*j^0  
 InitHotkey(); *)`kx   
 return CWinApp::InitInstance(); :m++ iR  
} TcKvSdr'  
`zzKD2y  
int CHookApp::ExitInstance() x*R8^BA]pR  
{ "h;;.Y8e  
 VerifyWindow(); Z'}(t,  
 UnInit(); Vy% :\p+  
 return CWinApp::ExitInstance(); wsJ%* eYf  
} #mRFUA  
,bVS.A'o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xjK_zO*dLq  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) TXJY2J*24  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c.8((h/  
#if _MSC_VER > 1000 lsB9;I^+x  
#pragma once 1] %W\RHxo  
#endif // _MSC_VER > 1000 /K,|k EE'n  
JIP+ !2  
class CCaptureDlg : public CDialog lLkmcHu  
{ ||=[kjG~  
 // Construction Wm$`ae   
 public: 6@?aVM~  
  BOOL bTray; ovDJ{3L6O  
  BOOL bRegistered; t8DL9RW'  
  BOOL RegisterHotkey(); &>W  (l.  
  UCHAR cKey; fKT Dt%  
  UCHAR cMask; xMNNXPz(  
  void DeleteIcon(); vcw>v={x  
  void AddIcon(); +dCDM1{_a  
  UINT nCount; xBL$]>  
  void SaveBmp(); b'7z DZI]  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor |k`f/*  
  // Dialog Data Z&dr0w8  
  //{{AFX_DATA(CCaptureDlg) c/<Sa|'  
  enum { IDD = IDD_CAPTURE_DIALOG }; $"sq4@N  
  CComboBox m_Key; g= FDm*  
  BOOL m_bControl; 5?5- ;H  
  BOOL m_bAlt; wc7mJxJxA  
  BOOL m_bShift; FJ{,=@  
  CString m_Path; n^iNo  
  CString m_Number; Np|'7D  
  //}}AFX_DATA W,HH *!  
  // ClassWizard generated virtual function overrides g|K6iY  
  //{{AFX_VIRTUAL(CCaptureDlg) Z;GIlgK9  
 public: 80?6I%UB<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .:{h{@a  
 protected: =% q?Cr  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 11)/] ?/j  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %NT`C9][  
  //}}AFX_VIRTUAL 1p7cv~#95  
  // Implementation Nm6Z|0S  
 protected: VqK%^  
  HICON m_hIcon; 8_a$kJJ2  
  // Generated message map functions AV:Xg4UJv  
  //{{AFX_MSG(CCaptureDlg) Uvjdx(fY[a  
  virtual BOOL OnInitDialog(); \~@[QGKN  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *xE"8pN/  
  afx_msg void OnPaint(); c=A(o  
  afx_msg HCURSOR OnQueryDragIcon(); 9Fy\t{ks  
  virtual void OnCancel(); ""1#bs{n  
  afx_msg void OnAbout(); -?< Ww{  
  afx_msg void OnBrowse(); hWD !  
  afx_msg void OnChange(); 1R=)17'O  
 //}}AFX_MSG TL},Unq  
 DECLARE_MESSAGE_MAP() 0?lp/|K  
}; ~L%Pz0Gg  
#endif M}Nb|V09  
9 wO/?   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file OUEI~b1  
#include "stdafx.h" 7FmbV/&c  
#include "Capture.h" qwq/Xcv  
#include "CaptureDlg.h" iNod</+"K  
#include <windowsx.h> .FIt.XPzv  
#pragma comment(lib,"hook.lib") omM&{ }8g  
#ifdef _DEBUG op hH9D  
#define new DEBUG_NEW hLb;5u&!kW  
#undef THIS_FILE P?9nTG  
static char THIS_FILE[] = __FILE__; u0m5JD0/  
#endif $%7I:  
#define IDM_SHELL WM_USER+1 C#MF pT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M{`/f@z(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :s'o~   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -O|&c9W.O  
class CAboutDlg : public CDialog -DTB6}kw  
{ /> ^@ O  
 public: k? 3S  
  CAboutDlg(); ;i<$7MR.e  
  // Dialog Data ic%?uWN  
  //{{AFX_DATA(CAboutDlg) .6>  hD1'  
  enum { IDD = IDD_ABOUTBOX }; i 8l./Yt/  
  //}}AFX_DATA XB0a dp  
  // ClassWizard generated virtual function overrides &|v{#,ymeb  
  //{{AFX_VIRTUAL(CAboutDlg) PX;Vo~6  
 protected: 3/X-Cr+d  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5Z/yhF.{  
  //}}AFX_VIRTUAL 5]jx5!N  
  // Implementation )O,wRd>5  
 protected: CF]i}xpWV  
  //{{AFX_MSG(CAboutDlg) >(hSW~i~  
  //}}AFX_MSG N>+P WE$  
  DECLARE_MESSAGE_MAP() S8 :"<B)  
}; &J8 Z@^  
hf;S]8|F  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) V,V*30K5  
{ 6}ce1|mkg/  
 //{{AFX_DATA_INIT(CAboutDlg) }$o*  
 //}}AFX_DATA_INIT IUOxGJ|rO  
} L2KG0i`+  
Lp_$?MCD.  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) `/z_rqJ0CL  
{ k@#5$Ejc2  
 CDialog::DoDataExchange(pDX); ,zQo {.  
 //{{AFX_DATA_MAP(CAboutDlg) U1OFDXHG  
 //}}AFX_DATA_MAP  s[3e=N  
} y8G&Wg aCi  
P Q7A~dw9  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Y4d3n  
 //{{AFX_MSG_MAP(CAboutDlg) )FRM_$t  
 // No message handlers bF*NWm$Lf  
 //}}AFX_MSG_MAP |+>uA[6#  
END_MESSAGE_MAP() wZ#Rlv,3Wa  
~A6"sb=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {J (R  
: CDialog(CCaptureDlg::IDD, pParent) KkEv#2n  
{ 1%%'6cWWu  
 //{{AFX_DATA_INIT(CCaptureDlg) 8O>}k  
  m_bControl = FALSE; >*IN  
  m_bAlt = FALSE; rah,dVE]  
  m_bShift = FALSE; }.p<wCPy6  
  m_Path = _T("c:\\"); + :Vrip  
  m_Number = _T("0 picture captured."); /D<"wF }@J  
  nCount=0; _5mc('  
  bRegistered=FALSE; P}0*{%jB  
  bTray=FALSE; F*M|<E=  
 //}}AFX_DATA_INIT moMYdArj  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 L'l F/qe^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "< v\M85&  
} ['z!{Ez  
n|Pr/ddL   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -T7%dLHY  
{ b/t  
 CDialog::DoDataExchange(pDX); } ^i b  
 //{{AFX_DATA_MAP(CCaptureDlg) -_NC%iN#C  
  DDX_Control(pDX, IDC_KEY, m_Key); =VNSi K>F  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Y2C9(Zk U  
  DDX_Check(pDX, IDC_ALT, m_bAlt); b.s9p7:J  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); %JtbRs(~q  
  DDX_Text(pDX, IDC_PATH, m_Path); mLwoi!]m  
  DDX_Text(pDX, IDC_NUMBER, m_Number); {Hl[C]25X  
 //}}AFX_DATA_MAP TI=h_%mO  
} QYQtMb,  
#O~XVuvF0  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) SVagT'BB  
//{{AFX_MSG_MAP(CCaptureDlg) P-CB;\  
 ON_WM_SYSCOMMAND() . V$ps-t  
 ON_WM_PAINT() ~]BMrgn  
 ON_WM_QUERYDRAGICON() ZsZcQj6G,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) BYi)j6"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) UNDi_6Dy   
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9GgA6#  
//}}AFX_MSG_MAP q_ %cbAcD  
END_MESSAGE_MAP() $+cAg >  
lv]quloT  
BOOL CCaptureDlg::OnInitDialog() f6!D L<  
{ pQMtj0(y  
 CDialog::OnInitDialog(); HG%Z "d  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ubYG  
 ASSERT(IDM_ABOUTBOX < 0xF000); dA_YL?o r  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @m~RtC-Q  
 if (pSysMenu != NULL) ?7jg(`Yh  
 { !"Q}R p  
  CString strAboutMenu; _n"Ae?TP  
  strAboutMenu.LoadString(IDS_ABOUTBOX); fj>C@p  
  if (!strAboutMenu.IsEmpty()) 09S6#;N&  
  { ;;Ds  
   pSysMenu->AppendMenu(MF_SEPARATOR); {fV}gR2  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); :m'+tGs  
  } vMla'5|l  
 } NOt@M  
 SetIcon(m_hIcon, TRUE); // Set big icon T@[!A);  
 SetIcon(m_hIcon, FALSE); // Set small icon f?56=& pHY  
 m_Key.SetCurSel(0); K=?VDN  
 RegisterHotkey(); RKZ6}q1n  
 CMenu* pMenu=GetSystemMenu(FALSE); x0Yse:RE^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); S[,8TErz  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Vw#{C>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND);  Fl3#D7K  
 return TRUE; // return TRUE unless you set the focus to a control WKmbNvN^  
} K>2#UzW  
Xf d*D  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,e`'4H  
{ ifK%6o6  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~]'pY  
 { U7iuY~L  
  CAboutDlg dlgAbout; jN0k9O>  
  dlgAbout.DoModal(); %O%=rUD  
 } \}_Yd8  
 else s '?GH  
 { }LP!)|E  
  CDialog::OnSysCommand(nID, lParam); zf[`~g  
 } 8FkFM^\1L  
} &v!WVa?  
pV(lhDNoQ  
void CCaptureDlg::OnPaint() wGsRS[  
{ B*1W`f  
 if (IsIconic()) nkDy!"K  
 { |3hY6aty  
  CPaintDC dc(this); // device context for painting {g6Qv-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ;AJTytE>%  
  // Center icon in client rectangle 2; `=P5V  
  int cxIcon = GetSystemMetrics(SM_CXICON); #~L h#  
  int cyIcon = GetSystemMetrics(SM_CYICON); }_ mT l@*  
  CRect rect; 4~z?"  
  GetClientRect(&rect); otJ!UfpR8  
  int x = (rect.Width() - cxIcon + 1) / 2; bEV<iZDq%  
  int y = (rect.Height() - cyIcon + 1) / 2; Oco YV J  
  // Draw the icon ,8MLoZ _  
  dc.DrawIcon(x, y, m_hIcon); BZv+H=b  
 } v"^~&q0x  
 else oU6y4yO  
 { 1 " #*)MF  
  CDialog::OnPaint(); *e#<n_%R  
 } 1w(JEqY3h:  
} xI*#(!x"G  
}/P5>F<H[  
HCURSOR CCaptureDlg::OnQueryDragIcon() B;K`q  
{ IJIzXU  
 return (HCURSOR) m_hIcon; zTbVp8\pI  
} C0*@0~8$9  
6t'l(E +  
void CCaptureDlg::OnCancel() f~{}zGTM:  
{ cbYLU\!  
 if(bTray) 9#d+RT  
  DeleteIcon(); JRMM?y  
  CDialog::OnCancel(); Wu6<\^A  
} A'&n5)tb  
Gfp1mev   
void CCaptureDlg::OnAbout() `qVjwJ!+  
{ )~6zYJ2  
 CAboutDlg dlg; {nT^t Aha  
 dlg.DoModal(); R%D'`*+  
} ;6ecrQMw&  
mo{MR:>)  
void CCaptureDlg::OnBrowse() ._9 n~=!  
{ `(6r3f~XJ  
 CString str; G rmzkNlN  
 BROWSEINFO bi; kql0J|P?  
 char name[MAX_PATH]; YXurYwV  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Em 6Qe  
 bi.hwndOwner=GetSafeHwnd(); bI)u/  
 bi.pszDisplayName=name; r7]zQIE  
 bi.lpszTitle="Select folder"; l7{oi!   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; l1U=f]  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ((tv2  
 if(idl==NULL) @+F4YJmB?l  
  return; m!z|h9Ed  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); C;QAT  
 str.ReleaseBuffer(); ,j:|w+l  
 m_Path=str; +ISz?~8  
 if(str.GetAt(str.GetLength()-1)!='\\') h7*W *Bd  
  m_Path+="\\"; `Q3s4VEC  
 UpdateData(FALSE); l!}:|N Yh!  
} -<v~snq'  
`@[c8j7  
void CCaptureDlg::SaveBmp() 4wd& 55=2  
{ +YLejjQ  
 CDC dc; zA+~7;7E  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); )*;zW! H  
 CBitmap bm; 'Jf^`ZT}  
 int Width=GetSystemMetrics(SM_CXSCREEN); !zj0/Q G\  
 int Height=GetSystemMetrics(SM_CYSCREEN); /xGmg`g<#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ~c)~015`  
 CDC tdc; @_:]J1jw7  
 tdc.CreateCompatibleDC(&dc); ~_s?k3cd  
 CBitmap*pOld=tdc.SelectObject(&bm); 'TH15r@  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6hZ@;Q=b  
 tdc.SelectObject(pOld); [gy*`@w  
 BITMAP btm; T,xPSN2A*  
 bm.GetBitmap(&btm); \<}&&SuH  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; }g#&Q0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /!^&;$A'  
 BITMAPINFOHEADER bih; Hqnxq  
 bih.biBitCount=btm.bmBitsPixel; c|F[.;cR  
 bih.biClrImportant=0; XNQAi (!GS  
 bih.biClrUsed=0; ,QzL)W7  
 bih.biCompression=0; 7\*FEjRM]  
 bih.biHeight=btm.bmHeight; wC `+  
 bih.biPlanes=1; >#Q\DsDS  
 bih.biSize=sizeof(BITMAPINFOHEADER); `(A5f71MfM  
 bih.biSizeImage=size; PP:(EN1  
 bih.biWidth=btm.bmWidth; pfu1 O6R  
 bih.biXPelsPerMeter=0;  (x^BKnZ  
 bih.biYPelsPerMeter=0; >5s6u`\  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); OpM(j&  
 static int filecount=0; I;VuW  
 CString name; ,rJXy_  
 name.Format("pict%04d.bmp",filecount++); !T](Udf  
 name=m_Path+name; J!'@Bd  
 BITMAPFILEHEADER bfh; {hln?'  
 bfh.bfReserved1=bfh.bfReserved2=0; AU-n&uX  
 bfh.bfType=((WORD)('M'<< 8)|'B'); "qc6=:y}  
 bfh.bfSize=54+size; .9md~j:o^s  
 bfh.bfOffBits=54; yQ#:J9HMJ  
 CFile bf; kJW N.  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #Z6'?p9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); L?5Ck<!xG  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); hx/N1 x  
  bf.WriteHuge(lpData,size); "4vy lHIo  
  bf.Close(); Dfq(Iv  
  nCount++; ;<G=M2  
 } T3`ludm^u  
 GlobalFreePtr(lpData); tmqY2.   
 if(nCount==1) 1x,[6H  
  m_Number.Format("%d picture captured.",nCount); 6s0_#wZC  
 else c@v{`d  
  m_Number.Format("%d pictures captured.",nCount); cZ)}LX  
  UpdateData(FALSE); DW)2 m;  
} 22f`LoM  
b~nAPY6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) OKF tl  
{ /-#I_>:8'  
 if(pMsg -> message == WM_KEYDOWN) Sz H"  
 { M33_ja+L  
  if(pMsg -> wParam == VK_ESCAPE) /-bO!RTwf  
   return TRUE; aW!@f[%~F  
  if(pMsg -> wParam == VK_RETURN) A:7k+4  
   return TRUE; JK.ZdY%  
 } 3;% 5Yu  
 return CDialog::PreTranslateMessage(pMsg); ?nP*\8  
} \GHiLs,!  
=gcM%=*'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lFTF ,G  
{ >y Y'7Ey  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ gi 0W;q  
  SaveBmp(); )T;?^kho  
  return FALSE; $95h2oXt  
} UI>Y0O  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3e(ehLc4DJ  
 CMenu pop; P(t[ eXe  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); K_K5'2dE  
 CMenu*pMenu=pop.GetSubMenu(0); 4lBU#V7  
 pMenu->SetDefaultItem(ID_EXITICON); wm+/e#'&  
 CPoint pt; EvOJ~'2 Y%  
 GetCursorPos(&pt); J!:SPQ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); eds26(  
 if(id==ID_EXITICON) #> j.$2G>  
  DeleteIcon(); |j 6OM{@  
 else if(id==ID_EXIT) B" 3dQwQ  
  OnCancel(); tU_y6  
 return FALSE; irN6g#B?  
} <!pY$  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); !qX_I db\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) B/` !K  
 AddIcon(); i86>]  
 return res; ?.D3'qv  
} =zyC-;r!  
5 Kkdo!z  
void CCaptureDlg::AddIcon() Q'%PNrN  
{ W3iZ|[E;  
 NOTIFYICONDATA data; o1<_fI  
 data.cbSize=sizeof(NOTIFYICONDATA); hGiz)v~  
 CString tip; b, :QT~g=  
 tip.LoadString(IDS_ICONTIP); `F/Tv 5@L  
 data.hIcon=GetIcon(0); yz0zFfiX  
 data.hWnd=GetSafeHwnd(); A<W 6=5h  
 strcpy(data.szTip,tip); Offu9`DiZ  
 data.uCallbackMessage=IDM_SHELL; Me=CSQqf<  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  Br` IW  
 data.uID=98; tO0!5#-VR  
 Shell_NotifyIcon(NIM_ADD,&data); [H=)  
 ShowWindow(SW_HIDE); 4q<=K=F  
 bTray=TRUE; P3oI2\)*i  
} o`Ta("9^  
rD*sl}  
void CCaptureDlg::DeleteIcon() y K"kEA[;  
{ %Qj;,#z  
 NOTIFYICONDATA data; %Q.&ZhB  
 data.cbSize=sizeof(NOTIFYICONDATA); ",!1m7[wF  
 data.hWnd=GetSafeHwnd(); :sC qjz  
 data.uID=98; ;&ASkI  
 Shell_NotifyIcon(NIM_DELETE,&data); # vry0i  
 ShowWindow(SW_SHOW); gCxAG  
 SetForegroundWindow(); 6C-z=s)P&  
 ShowWindow(SW_SHOWNORMAL); Ox@sI:CT  
 bTray=FALSE; 1bH;!J  
} D:Zy  
vBog0KD);s  
void CCaptureDlg::OnChange() z`\F@pX%wC  
{ |m2X+s9  
 RegisterHotkey(); DG?"5:Zd  
} Ps 8%J;  
CP6LHkM9  
BOOL CCaptureDlg::RegisterHotkey() Qci4J  
{ i F+vl]  
 UpdateData(); n/h,Lr)Z  
 UCHAR mask=0; %?m$`9yU  
 UCHAR key=0; hiUD]5Kp  
 if(m_bControl) 0@EwM  
  mask|=4; qM.bF&&Go  
 if(m_bAlt) 6,9o>zT%H  
  mask|=2; ~j<+k4I~  
 if(m_bShift) 3"P }n  
  mask|=1; 5sb\r,kW  
  key=Key_Table[m_Key.GetCurSel()]; eQ&ZX3*}  
 if(bRegistered){ . Z%{'CC  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8KRba4[  
  bRegistered=FALSE; f/V 2f].  
 } 7P9=)$(EH  
 cMask=mask; 1Uqu> '  
 cKey=key; ,dx3zBI  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); LU9A#  
 return bRegistered; "70WUx(\t  
} G8;w{-{m  
S*n@81Z  
  四、小结 *f?4   
=" g*\s?r  
  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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