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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: hE>%LcP  
  T4x%dg  
  一、实现方法 $Q< >M B7  
<C,lHt  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:  - }9a%  
j]' 7"b5  
#pragma data_seg("shareddata") ^8eu+E.{  
HHOOK hHook =NULL; //钩子句柄 avo[~ `.  
UINT nHookCount =0; //挂接的程序数目 1US4:6xX_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 jLG Q^v"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 a$ FO5%o  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey K _sHZ  
static int KeyCount =0; V t@]  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 yd4\%%]  
#pragma data_seg() z<9wh2*M  
"WE*ED  
  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。 fTg^~XmJ  
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  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: %ryYa  
YRm6~c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR E1-BB  
cKey,UCHAR cMask) y)e8pPDG  
{ ]3iQpL  
 BOOL bAdded=FALSE; V*w~Sr%  
 for(int index=0;index<MAX_KEY;index++){ G :JQ_w  
  if(hCallWnd[index]==0){ DqGm  
   hCallWnd[index]=hWnd; R9`37(c9+  
   HotKey[index]=cKey; ' (1`iQ;  
   HotKeyMask[index]=cMask; %qqX-SF0C  
   bAdded=TRUE; .~t.B!rVSB  
   KeyCount++; 2Ub!wee  
   break; ,4tuWO)"  
  } (Ld,<!eN0  
 } a08`h.dyN  
 return bAdded; V 0M&D,  
} 2/m4|  
//删除热键 hFp\,QSx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yO`HL'SMo  
{ oi:!YVc  
 BOOL bRemoved=FALSE; 6w Y6* R  
 for(int index=0;index<MAX_KEY;index++){ )eaEc9o>  
  if(hCallWnd[index]==hWnd){ KJ;;825?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4V9S~^v|  
    hCallWnd[index]=NULL; [Y_CRxa\u  
    HotKey[index]=0; hiQ #<  
    HotKeyMask[index]=0; L6=`x a,  
    bRemoved=TRUE; ydm2'aV  
    KeyCount--; U+FI^Xrt#  
    break; _8I\!  
   } u?B9zt%$-m  
  } /l&$B  
 } nA?Ks!9T  
 return bRemoved; EYD24  
} z[~ph/^  
vlS+UFH0  
O4.`N?Xq  
  DLL中的钩子函数如下: 9`X}G`  
7`_`V&3s  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :[C"}m R1  
{ p.|NZXk%%a  
 BOOL bProcessed=FALSE; V>Vu)7  
 if(HC_ACTION==nCode) X&14;lu%p  
 { y}bliN7;1e  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 JRYCM}C]  
   switch(wParam) Yfd0Np~  
   {  *H({q`j33k  
    case VK_MENU: <*F!A' w2o  
     MaskBits&=~ALTBIT; v%$c_'d  
     break; Q^! x8oUF  
    case VK_CONTROL: [;RO=  
     MaskBits&=~CTRLBIT; @&xWd{8'  
     break; [ qx[ 0  
    case VK_SHIFT: QDdH5EfY  
     MaskBits&=~SHIFTBIT; k ^(RSu<  
     break; d$T856  
    default: //judge the key and send message zz_(*0,Qcr  
     break; 0hr4}FL8  
   } r&_bk Y%  
   for(int index=0;index<MAX_KEY;index++){ VkJBqRzBOa  
    if(hCallWnd[index]==NULL) JK y0 6I  
     continue; f5o##ia7:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F9PXQD(  
    { .:/[%q{k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); dlJc~|  
     bProcessed=TRUE; FX,kmre3  
    } KqhE=2,  
   } O@-|_N*;K  
  } Sxzt|{  
  else if((lParam&0xc000ffff)==1){ //有键按下 { d|lN:B  
   switch(wParam) W|-<ekH_u  
   { p%ZOLoc)Y  
    case VK_MENU: #)b0&wyW6i  
     MaskBits|=ALTBIT; Pof]9qE-y  
     break; }LTyXo  
    case VK_CONTROL: $WICyI{$  
     MaskBits|=CTRLBIT; ;&i4QAo-  
     break; ki=]#]rg  
    case VK_SHIFT: *1`q x+1  
     MaskBits|=SHIFTBIT; vMv? fE"  
     break; f)#rBAkt  
    default: //judge the key and send message w)7s]Ld  
     break; R.P|gk  
   } q'1 86L87  
   for(int index=0;index<MAX_KEY;index++){ :xy4JRcF  
    if(hCallWnd[index]==NULL) _Qd C V`  
     continue; ~b;u1;ne  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .h r$<]  
    { ZBsV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n&\DJzW\#  
     bProcessed=TRUE; =+ALh-  
    } /:-Y7M*   
   } 1.IEs:(;  
  } He)vl.  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 HyGu3  
   for(int index=0;index<MAX_KEY;index++){ A(6n- zL  
    if(hCallWnd[index]==NULL) Pe?=M[u2  
     continue; ly( LMr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \9N )71n(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ZWXA%u7V  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `PS^o#  
   } v4Mn@e_#c  
  } !cNw 8"SIU  
 } 1)v]<Ga~%1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); B x-"<^<  
} W!B\VB  
/v8yE9N_  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: oxZXY]$y  
P TMJ.;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s ~>0<3{5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W'"p:Uh q  
B0$ge"FK9  
  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: |*v w(  
@ebSM#F?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  uq\[^  
{ L=9 ^Y/8Q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &e)V!o@wJV  
 { /vNHb _-  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ' o(7@   
  SaveBmp(); 2#)z%K6T  
  return FALSE; O/Mx $Q3re  
 } JyDg=%-$2  
 …… //其它处理及默认处理 R q9(<' F  
} ,-`A6ehg  
y134m  
yt[*4gF4  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Xv2Q8-}w  
jUGk=/*]e  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 +nz 0ZQ9 a  
> JP}OS  
  二、编程步骤 ~%?LFR'  
'Rq2x-72}  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; m5 l,Lxj  
WY$c^av<  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; v ocWV/  
i{biQ|,.sL  
  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; <`")Zxf+  
&`I7aP|  
  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; 4Qj@:b  
s`I]>e  
  5、 添加代码,编译运行程序。 Btyp=wfN[  
R "qt}4m  
三、程序代码 H6Q!~o\"H  
e N^6gub  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL S+7u,%n/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Z3O_K  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ('1]f?:M  
#if _MSC_VER > 1000 "'*Qq@!3?  
#pragma once Wxa</n8S[n  
#endif // _MSC_VER > 1000 Nq"J[l*+g  
#ifndef __AFXWIN_H__ bx:j`5Uj`  
#error include 'stdafx.h' before including this file for PCH 0mR^%+~  
#endif cP^c}e*;NS  
#include "resource.h" // main symbols w,1&s}; g\  
class CHookApp : public CWinApp PrvV]#O*  
{ X?++I 4\  
 public: f,'^"Me$c  
  CHookApp(); CZDWEM}   
  // Overrides b^R_8x  
  // ClassWizard generated virtual function overrides =4#p|OZP  
  //{{AFX_VIRTUAL(CHookApp) #tN!^LLi  
 public: 8;$zD]{D1  
  virtual BOOL InitInstance(); B\\M%!a>  
  virtual int ExitInstance(); {y`n _  
  //}}AFX_VIRTUAL SYA0Hiw7P  
  //{{AFX_MSG(CHookApp) :vJ1Fo!  
  // NOTE - the ClassWizard will add and remove member functions here. FJ] ?45  
  // DO NOT EDIT what you see in these blocks of generated code ! ,pIaYU{D  
  //}}AFX_MSG B3Daw/G  
  DECLARE_MESSAGE_MAP() (y5 ]]l  
}; @cB6,iUr  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1otE:bi  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UId?a} J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  ?)2;W  
BOOL InitHotkey(); $Gs|Z$(  
BOOL UnInit(); cv"Bhql  
#endif [7Liken  
go?}M]c%7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. NeR1}W  
#include "stdafx.h" N) '|l0x0  
#include "hook.h" b8&z~'ieR  
#include <windowsx.h> ?/}-&A"  
#ifdef _DEBUG _rz7)%Y'#$  
#define new DEBUG_NEW @*=eqO  
#undef THIS_FILE (05a 9  
static char THIS_FILE[] = __FILE__; gB])@O%/  
#endif qo7jrY5G  
#define MAX_KEY 100 6r)B|~,OA  
#define CTRLBIT 0x04 yX%NFXD  
#define ALTBIT 0x02 r<!/!}fE,  
#define SHIFTBIT 0x01 0?*":o30  
#pragma data_seg("shareddata") >0S(se$  
HHOOK hHook =NULL; Le2rc *T  
UINT nHookCount =0; 7`HKa@  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey o?5;l`.L}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT g 9AA)Ykp  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey B4{F)Zb  
static int KeyCount =0; & Tkl-{I  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift u-R;rf5%k  
#pragma data_seg() 1AQ3<  
HINSTANCE hins; I]Ws   
void VerifyWindow(); (l}nwyh5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) tN0?  
//{{AFX_MSG_MAP(CHookApp) B pp(5  
// NOTE - the ClassWizard will add and remove mapping macros here. 4F,RlKHBl  
// DO NOT EDIT what you see in these blocks of generated code! UV\&9>@L  
//}}AFX_MSG_MAP [<.dOe7|  
END_MESSAGE_MAP() 8gJg7RxL  
LCMn9I  
CHookApp::CHookApp() p4@0Dz`Q  
{ \L"0Pmt[  
 // TODO: add construction code here, LfMN 'Cb  
 // Place all significant initialization in InitInstance `=E4J2"  
} zO((FQ  
ZJV;&[$[  
CHookApp theApp; s]Z++Lh<{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V(M7d>N5G  
{ &IP`j~ b  
 BOOL bProcessed=FALSE; Dv}VmC""  
 if(HC_ACTION==nCode) l}W"> yQ0  
 { $d Nmq  
  if((lParam&0xc0000000)==0xc0000000){// Key up }b+$S'`Bv  
   switch(wParam) 3w8v.J8q  
   { K_-S`-eH  
    case VK_MENU: dG)}H _  
     MaskBits&=~ALTBIT; &{S@v9~IT  
     break; b q8nV  
    case VK_CONTROL: ,"Nb;Yhg  
     MaskBits&=~CTRLBIT; & sgzSX  
     break; QJ,~K&?  
    case VK_SHIFT: 0}- MWbG  
     MaskBits&=~SHIFTBIT; RY]jY | E  
     break; q U^`fIa  
    default: //judge the key and send message B6U4>ZN  
     break; Q #p gl  
   } J:l%  
   for(int index=0;index<MAX_KEY;index++){ IYe,VL  
    if(hCallWnd[index]==NULL) scyv]5Hm!  
     continue; ! _?#f|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u(~(+1W  
    { !BR@"%hx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &"=<w  
     bProcessed=TRUE; T1uOp5_]B  
    } LT:8/&\  
   } FrhI [D  
  } =~'y'K]  
  else if((lParam&0xc000ffff)==1){ //Key down }8Nr .gY  
   switch(wParam) .2SD)<}(9  
   { iz2;xa*  
    case VK_MENU: sM@1Qyv&0  
     MaskBits|=ALTBIT; c.uD%  
     break; xd!GRJ<I  
    case VK_CONTROL: 7o9[cq w  
     MaskBits|=CTRLBIT; m 3Do+!M[  
     break; ese?;1r  
    case VK_SHIFT: 1WAps#b.  
     MaskBits|=SHIFTBIT; |fPR7-  
     break;  )OZ  
    default: //judge the key and send message w%~Mg3|  
     break; -NUA  
   } wcL|{rUXba  
   for(int index=0;index<MAX_KEY;index++) n8o(>?Kw  
   { e84O 6K6o  
    if(hCallWnd[index]==NULL) y)T|1)  
     continue; B1o*phM g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W"H(HA  
    { &'c&B0j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); oA4<AJ2  
     bProcessed=TRUE; 4]no#lVRJ  
    } *C,1 x5  
   } <h*$bx]9 +  
  } ~X,ZZ 9H  
  if(!bProcessed){ Ki\J)l  
   for(int index=0;index<MAX_KEY;index++){ p*~b5'+ C+  
    if(hCallWnd[index]==NULL) N2&h yM  
     continue; K5 Z'kkOk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZQ[s/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 838@jip  
   } 3PEW0b*]Pf  
  } "BvDLe':  
 }  5 c1{[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \8]("l}ms8  
} trlZ  
Cg]S`R-  
BOOL InitHotkey() v(^;%  
{ &W N R{  
 if(hHook!=NULL){ iM~qSRb#mJ  
  nHookCount++; `Lr|KuFN  
  return TRUE; @O HsM?nW  
 } Gy!bPVe  
 else h/7_IuD  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); a4eE/1  
  if(hHook!=NULL) ) -@Dh6F  
   nHookCount++; #g]eDU-[  
  return (hHook!=NULL); hv)d  
} mf\@vI  
BOOL UnInit() ZC9S0Z  
{ CFG(4IMx  
 if(nHookCount>1){ tTPjCl  
  nHookCount--; 0|FQIhVuY  
  return TRUE; ]_2<uK}fg  
 } :CG;:( |  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 43N=O FU  
 if(unhooked==TRUE){ kV$VKag*A  
  nHookCount=0; DhT8Kh{  
  hHook=NULL; -{ Fy@$!  
 } #z9@x}p5g  
 return unhooked; 1V ; ,ZGI*  
} ]9~6lx3/  
^2uT!<2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %RXFgm!{f  
{ @WP%kX.?  
 BOOL bAdded=FALSE; J pKCux  
 for(int index=0;index<MAX_KEY;index++){ v.Xmrry  
  if(hCallWnd[index]==0){ wZ/ b;%I!  
   hCallWnd[index]=hWnd; [#/@ v/`  
   HotKey[index]=cKey; qIk( ei  
   HotKeyMask[index]=cMask; iH)-8Q  
   bAdded=TRUE; 1p(9hVA  
   KeyCount++; n@9R|biO  
   break; d*Kg_He-  
  } =p&uQ6.i+  
 } IvM>z03  
 return bAdded; !Z%pdqo`.  
} 47^7S=  
>{=~''d,w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P;ovPyoO  
{ DaqpveKa  
 BOOL bRemoved=FALSE; JvM:xy9  
 for(int index=0;index<MAX_KEY;index++){ E 7"`D\*  
  if(hCallWnd[index]==hWnd){ MzIn~[\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ EN)0b,ax  
    hCallWnd[index]=NULL; 2,G9~<t  
    HotKey[index]=0; 'Jl73#3  
    HotKeyMask[index]=0;  y-)5d  
    bRemoved=TRUE; 5Pd^Sew  
    KeyCount--; #LfoG?k1K  
    break; D*!9K8<o  
   } %Sw hNn  
  } DTC OhUIV  
 } m]/s R3yF  
 return bRemoved; =xM:8 hm  
} vp`s< ;CA  
:xsNn55b  
void VerifyWindow() ihopQb+k^m  
{ D@yu2}F{IY  
 for(int i=0;i<MAX_KEY;i++){ YbuS[l8  
  if(hCallWnd!=NULL){ F^X:5g~K  
   if(!IsWindow(hCallWnd)){ &U y Q<O>  
    hCallWnd=NULL; I5w> *F   
    HotKey=0; <@+{EK'`q  
    HotKeyMask=0; ~P!%i9e_  
    KeyCount--; 8Xz \,}$O  
   } >e QFY^d5  
  } HI{IC!6  
 } nmUMg  
} )"f*Mp  
wQN/MYF[  
BOOL CHookApp::InitInstance() /t_AiM,(  
{ Pa */&WeB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~A-D>.ZH  
 hins=AfxGetInstanceHandle(); fnn /akGKI  
 InitHotkey(); ;g_<i_ *x#  
 return CWinApp::InitInstance(); 7SjWofv  
} `r*bG=  
<CGJ:% AY  
int CHookApp::ExitInstance() g5~wdhpb  
{ u51Lp  
 VerifyWindow(); 7/6%92T/B  
 UnInit(); nSB@xP#&  
 return CWinApp::ExitInstance(); JI|MR#_u  
} swG!O}29OX  
2q%vd =T  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file MLt'tzgl  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ZG Qz@H5  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ L] !M1\  
#if _MSC_VER > 1000 vXeI)vFK  
#pragma once wak'L5GQE  
#endif // _MSC_VER > 1000 ^THyohK  
`*--vSi  
class CCaptureDlg : public CDialog I.u[9CI7HU  
{ NnqAr ,  
 // Construction GJn ~x  
 public: ?TY/'-M5  
  BOOL bTray; ;BYv&(#u1q  
  BOOL bRegistered; o/mGd~  
  BOOL RegisterHotkey(); YB"=eld  
  UCHAR cKey; \Qei}5P,  
  UCHAR cMask; z-?WU  
  void DeleteIcon(); t(=Z@9)]4F  
  void AddIcon(); lIgAc!q(  
  UINT nCount; eX <@qa4<  
  void SaveBmp(); lH%-#2]  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor E{}Vi>@V?  
  // Dialog Data Qk`LBvg1  
  //{{AFX_DATA(CCaptureDlg) 4pZ=CB+j  
  enum { IDD = IDD_CAPTURE_DIALOG }; l]z=0  
  CComboBox m_Key; nsyeid*  
  BOOL m_bControl; u]s}@(+.  
  BOOL m_bAlt; _?a.S8LxJZ  
  BOOL m_bShift; _vr;cjMI  
  CString m_Path; K)9+3(?  
  CString m_Number; g0A,VX:2  
  //}}AFX_DATA v}BXH4&Y  
  // ClassWizard generated virtual function overrides C vWt  
  //{{AFX_VIRTUAL(CCaptureDlg) 0p1~!X=I  
 public: T/ TMi&:?.  
  virtual BOOL PreTranslateMessage(MSG* pMsg); _A,mY6 *  
 protected: {qL}:ha?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b0 y*}  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Gc{s?rB_  
  //}}AFX_VIRTUAL !Yu|au  
  // Implementation !MQVtn^C#  
 protected: F]6$4o[  
  HICON m_hIcon; y rmi:=N(  
  // Generated message map functions #w&N) c>  
  //{{AFX_MSG(CCaptureDlg) %S]g8O[}nl  
  virtual BOOL OnInitDialog(); wv&#lM(  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); V25u_R`{  
  afx_msg void OnPaint(); p _q]Rt  
  afx_msg HCURSOR OnQueryDragIcon(); [?nM)4d  
  virtual void OnCancel(); s[#ww =T\  
  afx_msg void OnAbout(); C !6d`|  
  afx_msg void OnBrowse(); RzN9pAe  
  afx_msg void OnChange(); ?$Ii_.  
 //}}AFX_MSG zM!2JC  
 DECLARE_MESSAGE_MAP() -VkPy<)  
}; v `7`'  
#endif N_| '`]D  
)@a_|q@V  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file x0$#8  
#include "stdafx.h" JFh_3r'  
#include "Capture.h" KIYs[0*k  
#include "CaptureDlg.h" #Iwxt3K  
#include <windowsx.h> #Hi$squJ  
#pragma comment(lib,"hook.lib") Bf{c4YiF  
#ifdef _DEBUG |}naI_Qudv  
#define new DEBUG_NEW !\/J|~XZ  
#undef THIS_FILE G2 !J`}  
static char THIS_FILE[] = __FILE__; "*Gp@  
#endif ~dlpoT  
#define IDM_SHELL WM_USER+1 z 3N'Xk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 52#Ac;Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L}\~)  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; jC_m0Iwc  
class CAboutDlg : public CDialog c@/K}  
{ D=:O ^<  
 public: j/uu&\e  
  CAboutDlg(); 2^4OaHY88  
  // Dialog Data )l[bu6bM  
  //{{AFX_DATA(CAboutDlg) =uD^#AX  
  enum { IDD = IDD_ABOUTBOX }; ?<6yKxn  
  //}}AFX_DATA k07pI<a?  
  // ClassWizard generated virtual function overrides C] >?YR4  
  //{{AFX_VIRTUAL(CAboutDlg) ^Rc*X'Iz(!  
 protected: ~9DD=5\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JpC_au7CX  
  //}}AFX_VIRTUAL -mY,nMDb  
  // Implementation 8KHT"uc'*J  
 protected: -8m3L  
  //{{AFX_MSG(CAboutDlg) 9q_c`  
  //}}AFX_MSG Ji7<UJ30x  
  DECLARE_MESSAGE_MAP() D'<'"kUd  
}; bW^JR,  
6gTc)rhRT  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nD\H$5>5  
{ ky=h7#wdv-  
 //{{AFX_DATA_INIT(CAboutDlg) xvTz|Y  
 //}}AFX_DATA_INIT aKC,{}f$m  
} }B@44HdY  
2i)vT)~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) h@%a+6b?  
{ I@q(P>]X9  
 CDialog::DoDataExchange(pDX); @~8*  
 //{{AFX_DATA_MAP(CAboutDlg) 5dkXDta[G  
 //}}AFX_DATA_MAP XN}^:j_2  
} P9jPdls  
?3a:ntX h  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) F P>.@ Y  
 //{{AFX_MSG_MAP(CAboutDlg) xASH- 9  
 // No message handlers qA5 Ug  
 //}}AFX_MSG_MAP ^/fasl$#  
END_MESSAGE_MAP() Er@OmNT  
Ri;_ 8v[H|  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Aqo90(jffx  
: CDialog(CCaptureDlg::IDD, pParent) r>cN,C  
{ &l?AC%a5  
 //{{AFX_DATA_INIT(CCaptureDlg) 6o<(,\ad [  
  m_bControl = FALSE; |(3"_  
  m_bAlt = FALSE; z#^;'nnw  
  m_bShift = FALSE; w:07_`cH=  
  m_Path = _T("c:\\"); Nx=rw h  
  m_Number = _T("0 picture captured."); ]_43U` [#  
  nCount=0; ~Aw.=Yi=  
  bRegistered=FALSE; OZ, Xu&N  
  bTray=FALSE; AA<QI'6  
 //}}AFX_DATA_INIT JasA w7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .X34[AXd  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;"|QW?>$D  
} -rlCE-S  
y-N]{!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Fx )BMP  
{ -Pc6W9$  
 CDialog::DoDataExchange(pDX); aKz:hG  
 //{{AFX_DATA_MAP(CCaptureDlg) y3OF+;E  
  DDX_Control(pDX, IDC_KEY, m_Key); #*X\pjZ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Eo>EK>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); v-DZW,  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Fs&r ^ [/b  
  DDX_Text(pDX, IDC_PATH, m_Path); t^~Qv  
  DDX_Text(pDX, IDC_NUMBER, m_Number); XeX` h_  
 //}}AFX_DATA_MAP d r$E:kr  
} o>\o=%D.a  
pD;fFLvN  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :f~qt%%/  
//{{AFX_MSG_MAP(CCaptureDlg) }/2M?W0  
 ON_WM_SYSCOMMAND() (9Q@I8}Iy  
 ON_WM_PAINT() %"^8$A?>,k  
 ON_WM_QUERYDRAGICON() bX>R9i$  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ZdgzPs"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xSq{pxX  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Z):Nd9  
//}}AFX_MSG_MAP }CL7h;5N 3  
END_MESSAGE_MAP() oS^KC}X  
|=AaGJx  
BOOL CCaptureDlg::OnInitDialog() XIn,nCY;  
{ b_^y Ke^W  
 CDialog::OnInitDialog(); ?NR&3 q  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $4q$!jB5  
 ASSERT(IDM_ABOUTBOX < 0xF000); G`RQl@W>)(  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ><I{R|bC  
 if (pSysMenu != NULL) lBGYZ--  
 {  fj'7\[nZ  
  CString strAboutMenu; )3k?{1:  
  strAboutMenu.LoadString(IDS_ABOUTBOX); <QD[hO^/  
  if (!strAboutMenu.IsEmpty()) JJK-+a6cX  
  { Rqr>B(|  
   pSysMenu->AppendMenu(MF_SEPARATOR); :0Z\-7iK  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ih-J{1  
  } jl5&T{z  
 } )Z)Gb~G  
 SetIcon(m_hIcon, TRUE); // Set big icon Ub/ZzAwq  
 SetIcon(m_hIcon, FALSE); // Set small icon nJ h)iQu  
 m_Key.SetCurSel(0); rn/~W[  
 RegisterHotkey(); .3&( Y  
 CMenu* pMenu=GetSystemMenu(FALSE); &f2:aT)  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 54=*vokX_  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }(7TiCwd  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~LQzt@G4  
 return TRUE; // return TRUE unless you set the focus to a control +lxjuEiae  
} >wb Uxl%{5  
b0Dco0U(  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Jv}&8D  
{ 51Vqbtj^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "6 ~5RCZ  
 { <w`EU[y_  
  CAboutDlg dlgAbout; ;cB3D3fR.  
  dlgAbout.DoModal(); -Nn< pq  
 } eph2&)D}Ep  
 else <cU%yA710  
 { Tl2(%qB  
  CDialog::OnSysCommand(nID, lParam); =#=}|Q}  
 } #p"$%f5Q_  
} FzNj':D  
d0-4KN2  
void CCaptureDlg::OnPaint() *2pf> UzL  
{ 4:-x!lt  
 if (IsIconic()) 7ug"SV6Hb  
 { HLOr Dlj7  
  CPaintDC dc(this); // device context for painting -K3d u&j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); "$pbK:  
  // Center icon in client rectangle u`D _  
  int cxIcon = GetSystemMetrics(SM_CXICON); h ,n}=g+?  
  int cyIcon = GetSystemMetrics(SM_CYICON); .+kg1=s  
  CRect rect; S`$%C=a.  
  GetClientRect(&rect); x-]:g&5T  
  int x = (rect.Width() - cxIcon + 1) / 2; t+_\^Oa)  
  int y = (rect.Height() - cyIcon + 1) / 2; <ZheWl  
  // Draw the icon hz*T"HJ]t  
  dc.DrawIcon(x, y, m_hIcon); Lq;T\m_de  
 } iD*Hh-  
 else e9HL)=YP  
 { [$;cjys  
  CDialog::OnPaint(); 1\~I "$}  
 } Va?i#<a  
} ZZ  Hjv  
+3J<vM}dy  
HCURSOR CCaptureDlg::OnQueryDragIcon() r8?p6E  
{ 1wFW&|>1  
 return (HCURSOR) m_hIcon; S~)`{ \  
} 6VVxpDAi:  
(Gw*x sn1  
void CCaptureDlg::OnCancel() TgaxZW  
{ J e,o(:  
 if(bTray) y0`; br\X  
  DeleteIcon(); P;o  {t  
  CDialog::OnCancel(); JsNj!aeU%  
} qS9<_if2  
D'vaK89\  
void CCaptureDlg::OnAbout() 7B=VH r  
{ Cf9{lhE8  
 CAboutDlg dlg; cc3B}^@p=  
 dlg.DoModal(); /(*Ucv2i}T  
} Wy}^5]R0E  
3E^qh03(  
void CCaptureDlg::OnBrowse() }79O[&  
{ T~k@Z  
 CString str; Qrt\bz h/}  
 BROWSEINFO bi; c?e-2Dp(  
 char name[MAX_PATH]; YoW)]n  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); URs]S~tk  
 bi.hwndOwner=GetSafeHwnd(); Hy1$Kvub  
 bi.pszDisplayName=name; }Nd1'BVf  
 bi.lpszTitle="Select folder"; >}\s-/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; >$TvCw  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9TQVgkW  
 if(idl==NULL) |9=A"092{  
  return; <D3mt Q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \8=)X})  
 str.ReleaseBuffer(); `FQ]ad Fz  
 m_Path=str; >~nr,V.q  
 if(str.GetAt(str.GetLength()-1)!='\\') yvj/u c  
  m_Path+="\\"; G{]RC^Zo  
 UpdateData(FALSE); Jx~H4y=z  
} .|^Gde  
,dR.Sac v  
void CCaptureDlg::SaveBmp() z=) m6\  
{ 9I]Bt=2z  
 CDC dc; c8YbBdk'  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2.I|8d[  
 CBitmap bm; ge1. HG  
 int Width=GetSystemMetrics(SM_CXSCREEN); M:GpyE%  
 int Height=GetSystemMetrics(SM_CYSCREEN); nj:w1E/R  
 bm.CreateCompatibleBitmap(&dc,Width,Height); "3\y~<8%'  
 CDC tdc; ||>4XDV#  
 tdc.CreateCompatibleDC(&dc); Y|><Ls6Q  
 CBitmap*pOld=tdc.SelectObject(&bm); *U,J Q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); NS2vA>n8R  
 tdc.SelectObject(pOld); xYCJO(&  
 BITMAP btm; h?p_jI  
 bm.GetBitmap(&btm); 38D5vT)n  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; |(Mxbprz  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #Zw:&' QB  
 BITMAPINFOHEADER bih; Bh' fkW3  
 bih.biBitCount=btm.bmBitsPixel; Y|Q(JX  
 bih.biClrImportant=0; 9D+k71"+  
 bih.biClrUsed=0; $] "M`h  
 bih.biCompression=0; !5(DU~S*@S  
 bih.biHeight=btm.bmHeight; 4pf@.ra,  
 bih.biPlanes=1; ,AweHUEn  
 bih.biSize=sizeof(BITMAPINFOHEADER); d}zh.O5P!  
 bih.biSizeImage=size; ^n0;Q$\  
 bih.biWidth=btm.bmWidth; mf$YsvPq*+  
 bih.biXPelsPerMeter=0; YB7n}r23  
 bih.biYPelsPerMeter=0; %L*EB;nK  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ~Ym _ {  
 static int filecount=0; Q;8z&4s@  
 CString name; Qgj# k  
 name.Format("pict%04d.bmp",filecount++); OU/}cu  
 name=m_Path+name; Lm~<BBp.  
 BITMAPFILEHEADER bfh; ;7qIm83  
 bfh.bfReserved1=bfh.bfReserved2=0; 38p"lT  
 bfh.bfType=((WORD)('M'<< 8)|'B'); H^*AaA9-   
 bfh.bfSize=54+size; A6]X aF  
 bfh.bfOffBits=54; M,_ $s,  
 CFile bf; G |KA!q  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !i~(h&z  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); G|f9l?p  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); cVW7I  
  bf.WriteHuge(lpData,size); BYXc 'K  
  bf.Close(); :vb5J33U  
  nCount++; wDh]vH[  
 } TPJF?.le '  
 GlobalFreePtr(lpData); #4O4,F>e  
 if(nCount==1) (cOe*>L;  
  m_Number.Format("%d picture captured.",nCount); |Q 3d7y  
 else &L$9Ii  
  m_Number.Format("%d pictures captured.",nCount); ZI!:  
  UpdateData(FALSE); }6%XiP|  
} r[i^tIv6As  
qIQ=OY=6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $ ubU"  
{ IU"  
 if(pMsg -> message == WM_KEYDOWN) MGm*({%  
 { )1 T2u  
  if(pMsg -> wParam == VK_ESCAPE) ]}! @'+=  
   return TRUE; iVn4eLK^v  
  if(pMsg -> wParam == VK_RETURN) JkJ @bh Eu  
   return TRUE; 8F8?1  
 } o'$"MC+  
 return CDialog::PreTranslateMessage(pMsg); ]6^<VC`5D  
} HK/WO jr  
1v]%FC`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 49Jnp>h  
{ = 0d|F 8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n8<?<-2  
  SaveBmp(); [[IMf-]  
  return FALSE; Pl/ dUt_  
} c EYHB1*cT  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ lf7bx}P*  
 CMenu pop; F)hj\aHm k  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \t7yH]:>@  
 CMenu*pMenu=pop.GetSubMenu(0); !6'N-b1  
 pMenu->SetDefaultItem(ID_EXITICON); Dhn7N8(LF!  
 CPoint pt; nUP, Yd  
 GetCursorPos(&pt); A+RW=|:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); UmWXv#q\l  
 if(id==ID_EXITICON) /%&  d:  
  DeleteIcon(); dR]-R/1|  
 else if(id==ID_EXIT) kP%hgZ  
  OnCancel(); UA8hYWRP  
 return FALSE; Njg$~30  
} $o?U=  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jG[Vp b  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6/8K2_UeoW  
 AddIcon(); (NvjX})eh  
 return res; T"z<D+ pN  
} X!Z)V)@J8  
{oqbV#/&  
void CCaptureDlg::AddIcon() %42a>piev  
{ %LMpErZO  
 NOTIFYICONDATA data; +Umsr  
 data.cbSize=sizeof(NOTIFYICONDATA); R|C`  
 CString tip; +<1 |apS1  
 tip.LoadString(IDS_ICONTIP); [Jt}^  
 data.hIcon=GetIcon(0); >4X2uNbZS  
 data.hWnd=GetSafeHwnd(); | ky40[C  
 strcpy(data.szTip,tip); *,$5EN  
 data.uCallbackMessage=IDM_SHELL; >8(i;)(3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4]U=Y>\Sr  
 data.uID=98; _cs(f<>oCO  
 Shell_NotifyIcon(NIM_ADD,&data); T o["o!(;z  
 ShowWindow(SW_HIDE); }d?;kt  
 bTray=TRUE; GJ*IH9YR  
} }i~k:kmV  
1<BKTMBq?{  
void CCaptureDlg::DeleteIcon() Dds-;9  
{ K'ZNIRr/ C  
 NOTIFYICONDATA data; {1Ra |,;  
 data.cbSize=sizeof(NOTIFYICONDATA); (+|+ELfqW  
 data.hWnd=GetSafeHwnd(); 5I2,za&e  
 data.uID=98; src9EeiV  
 Shell_NotifyIcon(NIM_DELETE,&data); oFU:]+.+D  
 ShowWindow(SW_SHOW); TWpw/osW  
 SetForegroundWindow(); = J;I5:J  
 ShowWindow(SW_SHOWNORMAL); x 7by|G(  
 bTray=FALSE; )*BZo>"  
} @JbxGi  
eG,x\  
void CCaptureDlg::OnChange() C(XV YND3  
{ t<Acq07  
 RegisterHotkey(); e3 v^j$  
} 72s qt5C]  
2o?j{K  
BOOL CCaptureDlg::RegisterHotkey() #BLHHK/[  
{ AZ3T#f![L@  
 UpdateData(); .|O T#"LP  
 UCHAR mask=0; /qIQE&V-  
 UCHAR key=0; |_TiF ;^  
 if(m_bControl) > ubq{'  
  mask|=4; 7\ _MA!:<  
 if(m_bAlt) f7_( C0d  
  mask|=2; ?y-^Fq|h  
 if(m_bShift) TGF$zvd  
  mask|=1; [K3 te  
  key=Key_Table[m_Key.GetCurSel()]; s>J5.Z7"'j  
 if(bRegistered){ -MTk9<qnT  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); F$a s#.7FF  
  bRegistered=FALSE; X hq ss),  
 } H@uu;:l<7A  
 cMask=mask; x2B8G;6u  
 cKey=key; DJ"PP 5d  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,m#  
 return bRegistered; ni?k' \\  
} ;A,X,f  
T>B'T3or  
  四、小结 dkw.o.e  
aoey 5hts  
  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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