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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: _/i4MtM  
  w!fE;H8w6  
  一、实现方法 ")d`dj\o  
%Dwk  
  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: FCnm1x#  
hCC<?5q  
#pragma data_seg("shareddata") (1#J%  
HHOOK hHook =NULL; //钩子句柄 Q%xC}||1s"  
UINT nHookCount =0; //挂接的程序数目 C=eF.FB;'  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #Y$hNQQ$F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?Y@N`S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey dq]0X?[6  
static int KeyCount =0; )jt #=9ZQ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 A!h`]%0B  
#pragma data_seg() Z]B~{!W1  
Z<vKQ4 G  
  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。 gHo?[pS%y  
c@893<_  
  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: MdvcnaCG  
K*~0"F>"0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cXKjrL[b  
cKey,UCHAR cMask) p,eTY[k?  
{ /pT =0=  
 BOOL bAdded=FALSE; B]Thn  
 for(int index=0;index<MAX_KEY;index++){ Q\ 0cvmU  
  if(hCallWnd[index]==0){ #3gp6*R  
   hCallWnd[index]=hWnd; dw*_(ys  
   HotKey[index]=cKey; XCBL}pNkR  
   HotKeyMask[index]=cMask; g"}%2~Urf  
   bAdded=TRUE; A<??T[  
   KeyCount++; ~^1{B\I  
   break; CLUW!F  
  } ev*k*0  
 } Ru>MFG  
 return bAdded; [k/@E+;  
} )r jiY%F$  
//删除热键 2+e}*&iQpp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n CdR EXw  
{ c9&xe"v  
 BOOL bRemoved=FALSE; tP$<UKtU  
 for(int index=0;index<MAX_KEY;index++){ 9po3m]|zy  
  if(hCallWnd[index]==hWnd){ vkri+:S3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,^\2P$rT  
    hCallWnd[index]=NULL; Jcrw#l8|C  
    HotKey[index]=0; bcE._9@@  
    HotKeyMask[index]=0; 7t0e r'VC  
    bRemoved=TRUE; 67Th;h*sh  
    KeyCount--; OWg(#pZk  
    break; QC}CRkp  
   } 'Wm x)0)  
  } \RC'XKQ*n  
 } 5Ou`z5S\k  
 return bRemoved; woK&q7Vn  
} RO'7\xvn  
}E50>g  
Na]:_K5Dp  
  DLL中的钩子函数如下: ;z$(nhJ  
hvsWs.;L'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?fi,ifp*|l  
{ ]QlwR'&j/n  
 BOOL bProcessed=FALSE; ?iWi  
 if(HC_ACTION==nCode) w=T\3(%j  
 { P*3BB>FO   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 `xqr{lhL  
   switch(wParam) |}Nn!Sj>#;  
   {  #."-#"0  
    case VK_MENU: CTq&-l:f  
     MaskBits&=~ALTBIT; Nh_Mz;ITuu  
     break; ?kbiMs1;u  
    case VK_CONTROL: c7x~{V8  
     MaskBits&=~CTRLBIT; 4R1<nZ"e~  
     break; vunHNHltW0  
    case VK_SHIFT: jtW!"TOY  
     MaskBits&=~SHIFTBIT; (ROY?5 @c  
     break; Y[}>CYO  
    default: //judge the key and send message .$+#1-  
     break; Oi8.8M  
   } 'h|DO/X~L  
   for(int index=0;index<MAX_KEY;index++){ P2#XKG  
    if(hCallWnd[index]==NULL) K8GP@yD]M  
     continue; .6+Z^,3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =5~jx  
    { FQ<Ju.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [+n*~  
     bProcessed=TRUE; o,AAC  
    } aBNc(?ri  
   } dxMOn  
  } jCOIuw  
  else if((lParam&0xc000ffff)==1){ //有键按下 )rn*iJ.e8  
   switch(wParam) #S!)JM|4wk  
   { '7hu 2i5  
    case VK_MENU: n|9-KTe7|*  
     MaskBits|=ALTBIT; ib#KpEk  
     break; =Y|VgV  
    case VK_CONTROL: r1 !@hT  
     MaskBits|=CTRLBIT; `yrB->|vG  
     break; L*xhGoC=  
    case VK_SHIFT: ?PeJlpYzV  
     MaskBits|=SHIFTBIT; zPn+ V7F  
     break; 4'/nax$Bx;  
    default: //judge the key and send message ls\WXCH  
     break; {Aw#?#GPW  
   } iT3BF"ZqBO  
   for(int index=0;index<MAX_KEY;index++){ fI?>+I5  
    if(hCallWnd[index]==NULL) C~,a!qY  
     continue; EE&K0<?T|:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1"MhGNynB>  
    { riY~%9iV'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %*A0# F  
     bProcessed=TRUE; .sha&  
    } Y!-M_v/  
   } 46_xyz3+  
  } `2("gUCm  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 PUT=C1,OFR  
   for(int index=0;index<MAX_KEY;index++){ #+ 0M2Sa  
    if(hCallWnd[index]==NULL) <J< {l  
     continue; _S<3\%(0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *+Ek0M  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,w<S|#W~+  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 md)c0Bg8~  
   } bh,[ 3X%  
  } 4tRYw0f47  
 } _{I3i:f9X8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); DE}K~}sbd  
} P+@/O  
ry`Ho8N  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: yj 3cyLXw  
Pr':51(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~7*.6YnI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KKj a/p  
SoW9p^HJ  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Y2N>HK0  
!![DJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) X9v.1s,  
{ > kG GR  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) '\l"   
 { xI#9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Qp)v?k ]  
  SaveBmp(); oR)Jznmi}  
  return FALSE; @Q)OGjaq  
 } U6glp@s  
 …… //其它处理及默认处理 kyR:[+je  
} uw>Ba %5  
PS)4 I&;U  
pnl{&<$C%C  
  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。 Z3"%`*Tmq-  
k^3>Y%^1  
  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。 [A+ >^ {  
D=q:*x  
  二、编程步骤 l: HTk4$0  
-u6bAQ  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; \ :%(q/v"X  
T,,WoPU8t  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Sq>dt[7  
DrKP%BnS  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; "%`1 ]Fr  
I:R[;TB?y  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; =Gpylj7?~  
F+YZE[h%  
  5、 添加代码,编译运行程序。 e(]!GA  
ePOG}k($/%  
三、程序代码 ],@rS9K  
C)[,4wt,  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @E&J_un  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) NW~N}5T  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ so,t   
#if _MSC_VER > 1000 ,`'Qi%O  
#pragma once @6Y?\Wx$w  
#endif // _MSC_VER > 1000 v [wb~uw\  
#ifndef __AFXWIN_H__ :}He\V  
#error include 'stdafx.h' before including this file for PCH 9P1OP Xv*p  
#endif (!ux+K  
#include "resource.h" // main symbols )tC5Hijq,  
class CHookApp : public CWinApp :(/~:^!  
{ LdYB7T,  
 public: v> LIvi|]  
  CHookApp(); h9t$Uz^N  
  // Overrides MU`1LHg  
  // ClassWizard generated virtual function overrides 0at/c-K`  
  //{{AFX_VIRTUAL(CHookApp) R6` WN  
 public: iOd&B B6  
  virtual BOOL InitInstance(); <wk!hTm W  
  virtual int ExitInstance(); qmkAg }2  
  //}}AFX_VIRTUAL HZ aV7dOZ8  
  //{{AFX_MSG(CHookApp) 1T"`v tR  
  // NOTE - the ClassWizard will add and remove member functions here. F|'>NL-=  
  // DO NOT EDIT what you see in these blocks of generated code ! &p'Y^zL-  
  //}}AFX_MSG hr#M-K  
  DECLARE_MESSAGE_MAP() 4`4kfiS$  
}; Tm~" IB*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); \o z#l'z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -R|,9o^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6hno)kd{=  
BOOL InitHotkey(); H`*LBqDk  
BOOL UnInit(); EEEh~6?-e  
#endif =2`[&  
Kr?TxhUHd  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5#HW2"7  
#include "stdafx.h" iowTLq!?  
#include "hook.h" Gj1&tjK  
#include <windowsx.h> 0\X\izQ5  
#ifdef _DEBUG d6Ht2  
#define new DEBUG_NEW 8v:T.o;<  
#undef THIS_FILE %"q9:{m  
static char THIS_FILE[] = __FILE__; S ^!n45l  
#endif DBo%fYst  
#define MAX_KEY 100 |)IlMG  
#define CTRLBIT 0x04 dH;8mb|#'  
#define ALTBIT 0x02 ~uj#4>3T  
#define SHIFTBIT 0x01 $iN"9N%l  
#pragma data_seg("shareddata") ]Z>}6!  
HHOOK hHook =NULL; ;@mS^ik")$  
UINT nHookCount =0; 6/f7<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey x) ,eI'mf  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT p\Q5,eg  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey W/=.@JjI  
static int KeyCount =0; G4Q[Th  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift &agWaf1%a  
#pragma data_seg() ` )/vq-9  
HINSTANCE hins; pd:WEI ,  
void VerifyWindow(); ncZ+gzK|"  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 3OrczJ=[UF  
//{{AFX_MSG_MAP(CHookApp) F8nYV  
// NOTE - the ClassWizard will add and remove mapping macros here. >"??!|XG^  
// DO NOT EDIT what you see in these blocks of generated code! e6`Jbu+J<f  
//}}AFX_MSG_MAP ;0Q4<F  
END_MESSAGE_MAP() DHy q^pJ  
1jx:;j  
CHookApp::CHookApp() S.mG?zbw  
{ {AhthR%(1  
 // TODO: add construction code here,  U'k*_g  
 // Place all significant initialization in InitInstance 6]&OrS[  
} TtJH7  
EGGWrl}1  
CHookApp theApp; xzdf^Ce  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GF"hx`zyJ  
{ ]{sU&GqBLe  
 BOOL bProcessed=FALSE; Ryl:a\  
 if(HC_ACTION==nCode) "SNn^p59k  
 { |'e^QpU5  
  if((lParam&0xc0000000)==0xc0000000){// Key up Q{O+  
   switch(wParam) l#g\X'bK  
   { Z]A{ d[  
    case VK_MENU: 8f_l}k$Eg  
     MaskBits&=~ALTBIT; 1gE [v  
     break; Bj+S"yS  
    case VK_CONTROL: #QS`_TlKk  
     MaskBits&=~CTRLBIT; Q1T$k$n  
     break; IDad9 Bx  
    case VK_SHIFT: ] vz%iv_  
     MaskBits&=~SHIFTBIT; fJ=0HNmX  
     break; sSr&:BOsi  
    default: //judge the key and send message $| zX|  
     break; d8DV[{^  
   } f- K+]aZ)  
   for(int index=0;index<MAX_KEY;index++){ @#l `iK  
    if(hCallWnd[index]==NULL) w_aknt T  
     continue; m~w[~flgZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b10cuy|a/X  
    { tl[Uw[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P:hBt\5B  
     bProcessed=TRUE; U2ohHJ``  
    } 6gkV*|U,e  
   } /?wtF4  
  } nyX2|m&  
  else if((lParam&0xc000ffff)==1){ //Key down FXpJqlhNv  
   switch(wParam) TCMCK_SQL  
   { +Te\H  
    case VK_MENU: TeMHm ?1^  
     MaskBits|=ALTBIT; <!&[4-;fU  
     break; mbKZJ{|4s  
    case VK_CONTROL: S%$ }(  
     MaskBits|=CTRLBIT; ^8]NxV@l  
     break; )~& CvJ  
    case VK_SHIFT: aacpM[{f  
     MaskBits|=SHIFTBIT; n|6Ic,:[  
     break; aR[JD2G  
    default: //judge the key and send message /RG:W0=K  
     break; 2\)xpOj  
   } mWv3!i;G<s  
   for(int index=0;index<MAX_KEY;index++) hM_lsc  
   { 0$(WlP |  
    if(hCallWnd[index]==NULL) 'HO$C, 1]  
     continue; kF3k7,.8&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }cM}Oavh  
    { x/%aM1"X^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;p.v]0]is  
     bProcessed=TRUE; &U{#Kt5q  
    } C/_ZUF(V  
   } @hl.lq  
  } jxP;>K7O  
  if(!bProcessed){ $ux,9H'[  
   for(int index=0;index<MAX_KEY;index++){ +*\u :n  
    if(hCallWnd[index]==NULL) Cw~q4A6'  
     continue; Vo4,@scG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j SHk{T!J  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .L+6 $8m  
   } /hpY f]t  
  } c|f<u{'  
 } B=U 3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +[Dx?XM  
} u :}%xD6  
Y`KqEjsC*  
BOOL InitHotkey() QfmJn((  
{ ZVW'>M7.  
 if(hHook!=NULL){ ?K1/ <PE+  
  nHookCount++; "H2EL}3/]  
  return TRUE; WEAT01  
 } f@6QvkIa  
 else at@G/?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); *$#W]bO  
  if(hHook!=NULL) <g-9T-Ky  
   nHookCount++; .Q<>-3\K  
  return (hHook!=NULL); sm9k/(-  
} _qU4Fadgm  
BOOL UnInit() md+nj{Ib  
{ =-tw5], L  
 if(nHookCount>1){ '_<{ p3M  
  nHookCount--; sXqz+z$*  
  return TRUE; bkRLC_/d  
 } -<6\1J  
 BOOL unhooked = UnhookWindowsHookEx(hHook); } j<)L,  
 if(unhooked==TRUE){ QemyCCP+  
  nHookCount=0; j*d yp  
  hHook=NULL; S2E8G q9  
 } GeI-\F7b  
 return unhooked; 65L6:}#  
} _ "E$v&_  
B)$| vK=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S&e0u%8mc  
{ >d@&2FTO  
 BOOL bAdded=FALSE; uMUBh 80,L  
 for(int index=0;index<MAX_KEY;index++){ 85>05 ?  
  if(hCallWnd[index]==0){ .GbX]?dN  
   hCallWnd[index]=hWnd; GXcJ< v  
   HotKey[index]=cKey; eJ,/:=QQ{  
   HotKeyMask[index]=cMask; r=Gks=NX"  
   bAdded=TRUE; oL-]3TY~  
   KeyCount++; Q[Z8ok  
   break; w?3p';C  
  } uOKCAqYa  
 } zy?.u.4L  
 return bAdded; N%kt3vmQ_  
} \$R_YKGf1G  
{]*c29b>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hZdoc<  
{ `CBZhI%%  
 BOOL bRemoved=FALSE; "/yC@VC>  
 for(int index=0;index<MAX_KEY;index++){ !1rlN8w(qr  
  if(hCallWnd[index]==hWnd){ ,k.3|aZE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B{/R: Hm  
    hCallWnd[index]=NULL; 8Pfb~&X^Ws  
    HotKey[index]=0; Y5f1lUT  
    HotKeyMask[index]=0; Q}`0W[a ~  
    bRemoved=TRUE; !NIhx109q  
    KeyCount--; f< ia(d  
    break; D!@Ciw  
   } Yf:IKY  
  } 5c9^-|-T  
 } ^"2i   
 return bRemoved; 7jxslI&F  
} ?:pP8/y  
~Uj=^leYO  
void VerifyWindow() ;m0~L=w  
{ 2SD`OABf#  
 for(int i=0;i<MAX_KEY;i++){ Ut*`:]la  
  if(hCallWnd!=NULL){ tankR9(o  
   if(!IsWindow(hCallWnd)){ [O$Wa:< 0x  
    hCallWnd=NULL; VdPtPq1  
    HotKey=0; ?OId\'q  
    HotKeyMask=0; O $LfuL  
    KeyCount--; rr+|Zt Y  
   } V n7*JS  
  } vV6<^ W:9F  
 } s0\X ^  
} &[_g6OL  
Jk&3%^P{m  
BOOL CHookApp::InitInstance() neB\q[k  
{ d<% z 1Dj2  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); k\wW##=v  
 hins=AfxGetInstanceHandle(); "76 ]u)  
 InitHotkey(); <W|3\p6  
 return CWinApp::InitInstance(); H6kR)~zhf  
} 3e #p @sB  
+:8fC$vVfC  
int CHookApp::ExitInstance() -mAUo;O  
{ NYyh|X:m  
 VerifyWindow(); c*(bO3 b  
 UnInit(); J\/cCW-rF  
 return CWinApp::ExitInstance(); 3Q"<<pi!~  
} lun#^J  
D~biKrg?=  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [6pD  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~:0sk"t$1  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1Y/s%L  
#if _MSC_VER > 1000 3%l*N&gsg:  
#pragma once ]@dZ{H|  
#endif // _MSC_VER > 1000 ?b*s. ^  
RdWRWxTn8+  
class CCaptureDlg : public CDialog ? Fi=P#  
{ ]|!OP  
 // Construction F{Z~ R  
 public: }e!x5g   
  BOOL bTray; N+++4;  
  BOOL bRegistered; 2gc/3*F8  
  BOOL RegisterHotkey(); gaQdG=G8$  
  UCHAR cKey; 48c1gUw oP  
  UCHAR cMask; .|hf\1_J  
  void DeleteIcon(); fo5iJz"Z  
  void AddIcon(); hq%?=2'9?  
  UINT nCount; o%v0h~tn  
  void SaveBmp(); >,TUZ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor V:qSy#e  
  // Dialog Data ,3?Q(=j  
  //{{AFX_DATA(CCaptureDlg) S\4tzz @  
  enum { IDD = IDD_CAPTURE_DIALOG }; B&\IGWG(  
  CComboBox m_Key; FR$:"  
  BOOL m_bControl; OPwtV9%  
  BOOL m_bAlt; .}^g!jm~h  
  BOOL m_bShift; ao%NK<Lt  
  CString m_Path; &wi e]  
  CString m_Number; Uhe=h&e2k@  
  //}}AFX_DATA JX -' mV`  
  // ClassWizard generated virtual function overrides 4y)P>c  
  //{{AFX_VIRTUAL(CCaptureDlg) | 1E|hh@k  
 public: |s'Po^Sy  
  virtual BOOL PreTranslateMessage(MSG* pMsg); &atuK*W>  
 protected: _  <WJ7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2#P* ,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3wOZ4<B  
  //}}AFX_VIRTUAL M*!agh  
  // Implementation lU @]@_<  
 protected: Xp >7iX!:  
  HICON m_hIcon; C3*gn}[  
  // Generated message map functions I2TaT(e\  
  //{{AFX_MSG(CCaptureDlg) d_CKP"TA  
  virtual BOOL OnInitDialog(); 5Eg1Q YVt  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "|Xk2U  
  afx_msg void OnPaint(); 2-7IJ\  
  afx_msg HCURSOR OnQueryDragIcon(); yGWxpzmRS  
  virtual void OnCancel(); bW$J~ynM  
  afx_msg void OnAbout(); @<&5J7fb  
  afx_msg void OnBrowse(); j2ve^F:Q  
  afx_msg void OnChange(); ~T9/#-e>BF  
 //}}AFX_MSG QFw  +cy  
 DECLARE_MESSAGE_MAP() * vflscgt  
}; _I:~@  
#endif e^d0zl{  
hHN'w73z  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &Nj3h(Ll  
#include "stdafx.h" @HQ`~C#Z'  
#include "Capture.h" )#P; x "  
#include "CaptureDlg.h" 1>*#%R?W  
#include <windowsx.h> L0* nm.1X  
#pragma comment(lib,"hook.lib") u\ #"L  
#ifdef _DEBUG a&tSj35*6  
#define new DEBUG_NEW ]4~lYuI4  
#undef THIS_FILE K#EvFs`s;  
static char THIS_FILE[] = __FILE__; p!>oo1&  
#endif vtw6FX_B  
#define IDM_SHELL WM_USER+1 #OIcLEn%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aEM%R<e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s}j{#xT  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A9f)tqbc  
class CAboutDlg : public CDialog u xW~uEh  
{ KB%"bqB|  
 public: r YogW!  
  CAboutDlg(); &0='r;*i  
  // Dialog Data 3|WWo1  
  //{{AFX_DATA(CAboutDlg) !u_Y7i3^  
  enum { IDD = IDD_ABOUTBOX }; }lh I\q  
  //}}AFX_DATA &S( .GdEf  
  // ClassWizard generated virtual function overrides v\!Be[ ?  
  //{{AFX_VIRTUAL(CAboutDlg) Y]NSN-t  
 protected: #.it]Nv{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support AB F"~=aL  
  //}}AFX_VIRTUAL ko Z  
  // Implementation ,RJtm%w  
 protected: /a^1_q-bX  
  //{{AFX_MSG(CAboutDlg) (^@ra$.  
  //}}AFX_MSG WX=Jl<  
  DECLARE_MESSAGE_MAP() ?3*l{[@J  
}; XM1WfjE\  
2@9Tfm(=  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dls ss\c^M  
{ LO <  
 //{{AFX_DATA_INIT(CAboutDlg) zhpx"{_  
 //}}AFX_DATA_INIT *RXbc~ H  
} L!rw[x  
vY%d   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9{-EJ)  
{ vWRju*Z&  
 CDialog::DoDataExchange(pDX); K%"5ImM  
 //{{AFX_DATA_MAP(CAboutDlg) `wus\&!W  
 //}}AFX_DATA_MAP 3D` YZ#M  
} l% ?T2Fm3>  
@\0Eu212  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) w9NHk~LHKF  
 //{{AFX_MSG_MAP(CAboutDlg) ux_Mrh'  
 // No message handlers ?**+e%$$  
 //}}AFX_MSG_MAP eln&]d;  
END_MESSAGE_MAP() 7]9 a<  
]<H&+ &!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) IqC]!H0  
: CDialog(CCaptureDlg::IDD, pParent) }D7I3]2>   
{ b+@JY2dvj  
 //{{AFX_DATA_INIT(CCaptureDlg) 0|$v-`P$  
  m_bControl = FALSE; odPL {XFj  
  m_bAlt = FALSE; %K\?E98M  
  m_bShift = FALSE; R(2tlZ  
  m_Path = _T("c:\\"); ,_yh z0.  
  m_Number = _T("0 picture captured."); c%&: 6QniZ  
  nCount=0; Pm lx8@D  
  bRegistered=FALSE; nX(+s*Y+w  
  bTray=FALSE; I 6<*X  
 //}}AFX_DATA_INIT Bm"KOr$}-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 1jy9lP=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); I 4,K43|  
} 2C/$Ei^t  
/h*>P:i].  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) c:-!'l$ !  
{ Z2TL#@  
 CDialog::DoDataExchange(pDX); kB'Fkqwm  
 //{{AFX_DATA_MAP(CCaptureDlg) Eve.QAl|  
  DDX_Control(pDX, IDC_KEY, m_Key); mMb'@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); UG)8D5  
  DDX_Check(pDX, IDC_ALT, m_bAlt); sB^<6W!`(  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); TYJ:!  
  DDX_Text(pDX, IDC_PATH, m_Path); 3~}uqaGt  
  DDX_Text(pDX, IDC_NUMBER, m_Number); T{Sb^-H#X  
 //}}AFX_DATA_MAP Z$0 uH*h  
} gA:5M  
ZHGC6a!a  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) )=AHf?hn  
//{{AFX_MSG_MAP(CCaptureDlg) b!sRk@LGZ  
 ON_WM_SYSCOMMAND() fRtUvC-#H  
 ON_WM_PAINT() O)ME"@r@:  
 ON_WM_QUERYDRAGICON() 'h^0HE\~p  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) MxGu>r  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }z\_;\7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9T |IvQK8  
//}}AFX_MSG_MAP qW!]co  
END_MESSAGE_MAP()  A-4h  
J.ck~;3  
BOOL CCaptureDlg::OnInitDialog() % !du,2  
{ 6ek;8dL  
 CDialog::OnInitDialog(); ?pn}s]*/  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); S zUpWy&  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5dB'&8DX  
 CMenu* pSysMenu = GetSystemMenu(FALSE); epU:  
 if (pSysMenu != NULL)  ))&;}2{  
 { m|=H#  
  CString strAboutMenu; q{t*34R  
  strAboutMenu.LoadString(IDS_ABOUTBOX); NX|v=  
  if (!strAboutMenu.IsEmpty()) d!:6[7X6  
  { xZ4~Oo@@_'  
   pSysMenu->AppendMenu(MF_SEPARATOR); Z00+!Tnd  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); P?t" jKp'  
  } hO';{Nl/$  
 } _T2=J+"-Kp  
 SetIcon(m_hIcon, TRUE); // Set big icon \T <$9aNb  
 SetIcon(m_hIcon, FALSE); // Set small icon 2I&o69x?  
 m_Key.SetCurSel(0); >y[oP!-|P  
 RegisterHotkey(); 9'{}!-(xR  
 CMenu* pMenu=GetSystemMenu(FALSE); l2l(_$@3  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6xZ=^;H  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); tQ H+)*  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %*&UJpbA  
 return TRUE; // return TRUE unless you set the focus to a control o>7ts&rk  
} i K12 pw  
S(uf(q|{  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 'UMXq~RMe  
{ wg0 \_@3  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,4ei2`wV  
 { sO.`x*  
  CAboutDlg dlgAbout; L2, 1Kt7  
  dlgAbout.DoModal(); z .Y$7bf)  
 } d)pV;6%[$q  
 else QF&W`c  
 { !zPa_`P  
  CDialog::OnSysCommand(nID, lParam); Db6om7N  
 } f|R"u W +  
} Sp}tD<V  
D<Z p!J1o  
void CCaptureDlg::OnPaint() 'k4E4OB  
{ cOPB2\,  
 if (IsIconic()) "dI;  
 { xia|+  
  CPaintDC dc(this); // device context for painting ap{2$k ,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); O9g{+e`  
  // Center icon in client rectangle w^LuIbA  
  int cxIcon = GetSystemMetrics(SM_CXICON); F$^Su<w5l  
  int cyIcon = GetSystemMetrics(SM_CYICON); L3n_ 5|  
  CRect rect; *&d<yJM`b  
  GetClientRect(&rect); (ZY@$''  
  int x = (rect.Width() - cxIcon + 1) / 2; V^\8BVw  
  int y = (rect.Height() - cyIcon + 1) / 2; QK+(g,)_86  
  // Draw the icon ed:@C?  
  dc.DrawIcon(x, y, m_hIcon); Z7RiPSdxp  
 } m+#iR}*1L  
 else 1P(|[W1  
 { ,}:G\u*Fu  
  CDialog::OnPaint(); wbe<'/X+  
 } 2 ho>eRX  
} )=-0M9e.{  
kdn'6>\  
HCURSOR CCaptureDlg::OnQueryDragIcon() S6fL>'uQ  
{ ak:ibV  
 return (HCURSOR) m_hIcon; 8 O67  
} :_@JA0n  
UQ[B?jc  
void CCaptureDlg::OnCancel() fm^@i;D  
{ me'd6!O9-  
 if(bTray) x3u4v~ "-  
  DeleteIcon(); XXh6^@H=  
  CDialog::OnCancel(); KX}Rr7a  
} RKPD4e>%  
|U_]vMq  
void CCaptureDlg::OnAbout() P(;?kg}0  
{ VwEb7v,^0\  
 CAboutDlg dlg; XEdzpkB  
 dlg.DoModal(); #rY sj-2  
} HU9Sl*/  
4[BG#  
void CCaptureDlg::OnBrowse() (I@rLvZr{  
{ eQVZO>)P1+  
 CString str; J@OB`2?Zv  
 BROWSEINFO bi; H<QT3RF2  
 char name[MAX_PATH]; J7v|vj I  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); MSV2ip3  
 bi.hwndOwner=GetSafeHwnd(); A.D{.a  
 bi.pszDisplayName=name; =+x yI  
 bi.lpszTitle="Select folder"; [Tnsr(Z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; kFQ8 y~>y}  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); TO-nD>  
 if(idl==NULL) ,:%"-`a%  
  return; ) /v6l  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >y}M.Mm  
 str.ReleaseBuffer(); %eJGt e-  
 m_Path=str; CT\;xt,S  
 if(str.GetAt(str.GetLength()-1)!='\\') doB  
  m_Path+="\\"; 4&HXkRs:  
 UpdateData(FALSE); b9"jtRTdz  
} '}rRzD:  
l9Q(xuhv  
void CCaptureDlg::SaveBmp() j+^oz'q  
{ N |1>ooU[  
 CDC dc; OKHX)"j\\  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^::EikpF%  
 CBitmap bm; 0x9x@gF  
 int Width=GetSystemMetrics(SM_CXSCREEN); iA,kX\nK  
 int Height=GetSystemMetrics(SM_CYSCREEN); >OP+^^oZ<  
 bm.CreateCompatibleBitmap(&dc,Width,Height); f"( X(1F  
 CDC tdc; c5Q<$86  
 tdc.CreateCompatibleDC(&dc); jM&r{^(  
 CBitmap*pOld=tdc.SelectObject(&bm); E( h<$w8s  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); TI !a)X  
 tdc.SelectObject(pOld); |TE}`?y[g  
 BITMAP btm; NWd<+-pC6  
 bm.GetBitmap(&btm); IQ!\w-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 3&x-}y~sg  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); @A+RVg*=  
 BITMAPINFOHEADER bih; ex<O]kPFE  
 bih.biBitCount=btm.bmBitsPixel; suH&jE$x  
 bih.biClrImportant=0; Nk[2nyeO>  
 bih.biClrUsed=0; 5qf BEPJ  
 bih.biCompression=0; <jS~ WI@  
 bih.biHeight=btm.bmHeight; 5~.ZlGd  
 bih.biPlanes=1; (Z}>1WRju  
 bih.biSize=sizeof(BITMAPINFOHEADER); nkv(~ej(  
 bih.biSizeImage=size; @vMA=v7a  
 bih.biWidth=btm.bmWidth; kqb0>rYa   
 bih.biXPelsPerMeter=0; O8] 'o*<]  
 bih.biYPelsPerMeter=0; OgcHS?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !6G?zipB  
 static int filecount=0; j&UMjI9[  
 CString name; "/]| Hhc{  
 name.Format("pict%04d.bmp",filecount++); YUf1N?z  
 name=m_Path+name; b7/AnSR~Jt  
 BITMAPFILEHEADER bfh; A!vCb 8(TX  
 bfh.bfReserved1=bfh.bfReserved2=0; 2S8P}$mM  
 bfh.bfType=((WORD)('M'<< 8)|'B'); O,<IGO  
 bfh.bfSize=54+size; O'GG Ti]e  
 bfh.bfOffBits=54; vfB2XVc  
 CFile bf; KvQ,;A  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ CAT.4GM  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -AYA~O(&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !WkIi^T  
  bf.WriteHuge(lpData,size); 3@n>*7/E  
  bf.Close(); +m}Pmi$  
  nCount++; __@zTSVb  
 } <} jPXEB"  
 GlobalFreePtr(lpData); =H8 xSJLh  
 if(nCount==1) 4gSH(*}  
  m_Number.Format("%d picture captured.",nCount); b.O9ITR  
 else a{[+<8=@1  
  m_Number.Format("%d pictures captured.",nCount); .P$IJUYO  
  UpdateData(FALSE); I5AO?BzJ  
} T<-=nX  
?4CNkk=v  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Cv)/7vyB8  
{ (]*H[)F/  
 if(pMsg -> message == WM_KEYDOWN) q4UA]+-*  
 { =N);v\ Q$!  
  if(pMsg -> wParam == VK_ESCAPE) O9(r{Vu7u  
   return TRUE; `Y40w#?uW  
  if(pMsg -> wParam == VK_RETURN) ?4G|+yby  
   return TRUE; Zs2-u^3&  
 } I =Wc&1g  
 return CDialog::PreTranslateMessage(pMsg); %g]vxm5?  
} zu2HH<E  
>%Ee#m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >\<*4J$PZ  
{ }]UB;id'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ : t$l.+B  
  SaveBmp(); U"f ??y%)  
  return FALSE; `N/RHb%  
} 6+K_Z\  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]=73-ywn]  
 CMenu pop; d {2  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~e@>zoM'^  
 CMenu*pMenu=pop.GetSubMenu(0); @OV-KT[>  
 pMenu->SetDefaultItem(ID_EXITICON); k;dXOn  
 CPoint pt; z5Qs @dG  
 GetCursorPos(&pt); XA_FOw!cX  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +~nzii3  
 if(id==ID_EXITICON) _U| 7'^|  
  DeleteIcon(); Xj+q~4{|vt  
 else if(id==ID_EXIT) wyxGe<1  
  OnCancel(); Dbx~n#nG  
 return FALSE; aH_6s4+:  
} ]J2:194  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); lo&#(L+2  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Gi^Ha=?J%  
 AddIcon(); .wrL3z_  
 return res; $\a5&1rl  
} T:asm1BC[  
MVv1.6c7Y  
void CCaptureDlg::AddIcon() {}>n{_  
{ pN[0YmY#  
 NOTIFYICONDATA data; IO.<q,pP!_  
 data.cbSize=sizeof(NOTIFYICONDATA); /DS?}I.*]  
 CString tip; Wx)K* 9  
 tip.LoadString(IDS_ICONTIP); 4YU/uQm  
 data.hIcon=GetIcon(0); sTHq&(hLUG  
 data.hWnd=GetSafeHwnd(); o=fgin/E\  
 strcpy(data.szTip,tip); smAC,-6 ]~  
 data.uCallbackMessage=IDM_SHELL; ^a9 oKI9n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^ons:$0h  
 data.uID=98; w8~K/>!f  
 Shell_NotifyIcon(NIM_ADD,&data); j%Y\A~DV  
 ShowWindow(SW_HIDE); BRG|Asg(  
 bTray=TRUE; s]B"qF A  
} *j)M]  
-dTLunv  
void CCaptureDlg::DeleteIcon() 0>6DSQq~t(  
{ \[wCp*;1}  
 NOTIFYICONDATA data; mZ0J!QYk  
 data.cbSize=sizeof(NOTIFYICONDATA); pF=g||gS  
 data.hWnd=GetSafeHwnd(); H ;@!?I  
 data.uID=98; y@ek=fT%4  
 Shell_NotifyIcon(NIM_DELETE,&data); m)?5}ZwAH  
 ShowWindow(SW_SHOW); 1ywU@].6J]  
 SetForegroundWindow(); 0WxCSL$#I  
 ShowWindow(SW_SHOWNORMAL); r@)A k  
 bTray=FALSE; QBE@(2G}C  
} ? S=W&  
Sj 3oV  
void CCaptureDlg::OnChange() i&+w _hD  
{ nX%AeDBAT  
 RegisterHotkey(); =)<3pGO  
} #'o7x'n^  
msTB'0  
BOOL CCaptureDlg::RegisterHotkey() Vj^dD9:  
{ {gy+3  
 UpdateData(); @O3/3vi1  
 UCHAR mask=0; (hZ:X)E>  
 UCHAR key=0; +`| *s3M  
 if(m_bControl) :9d\Uj,  
  mask|=4; F#q&(  
 if(m_bAlt) Db03Nk>#  
  mask|=2; \ a-CN>  
 if(m_bShift) Fq,N  
  mask|=1; ddpl Pzm#  
  key=Key_Table[m_Key.GetCurSel()]; nf%4sIQ*x  
 if(bRegistered){ 7$T8&Mh  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &&RA4  
  bRegistered=FALSE; e 3@x*XI  
 } ij)Cm]4(2  
 cMask=mask;  ~Nh&.a  
 cKey=key; U1m\\<,  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }#N]0I)JI  
 return bRegistered; o$bUY7_  
} _3^y|_!  
I^0 t2[M  
  四、小结 <DiOWi  
R ZcH+?7  
  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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