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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: #Dfo#]k(  
  !jqWwi  
  一、实现方法 [i]r-|_K  
 ,YhwpkL  
  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: (5^ZlOk3  
AnZclqtb  
#pragma data_seg("shareddata") bAr` E  
HHOOK hHook =NULL; //钩子句柄 w{ `|N$  
UINT nHookCount =0; //挂接的程序数目 H6aM&r9}  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 EC<b3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 V[a[i>,Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey F~U!1)  
static int KeyCount =0; hnWo|! ,O$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 M`D$!BJr  
#pragma data_seg() _~aG|mAj  
buk=p-oi  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 9j*0D("  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: SK$Vk[c]  
fRTo.u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /NF#+bx  
cKey,UCHAR cMask) mCKk*5ws5"  
{ bXM/2Z?6  
 BOOL bAdded=FALSE; HI&kP+,y  
 for(int index=0;index<MAX_KEY;index++){ y|_Eu:  
  if(hCallWnd[index]==0){ ep(g`e  
   hCallWnd[index]=hWnd; w?csV8ot  
   HotKey[index]=cKey; 59Sw+iZj  
   HotKeyMask[index]=cMask; ED} 31L  
   bAdded=TRUE; %IBL0NQT  
   KeyCount++; #f'DEo<b  
   break; =FW5Tkw0  
  } N<z`yV  
 } !F!3Q4  
 return bAdded; K'6[J"dB  
} PI5j"u UO  
//删除热键 !D.0 (J  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "r.2]R3  
{ R_D c)  
 BOOL bRemoved=FALSE; Sav`%0q?7a  
 for(int index=0;index<MAX_KEY;index++){ "PpjoM ~  
  if(hCallWnd[index]==hWnd){ C>|@& o1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2pyt&'NJua  
    hCallWnd[index]=NULL; i~qfGl p6)  
    HotKey[index]=0; B94 &elu  
    HotKeyMask[index]=0; :,*eX' fH  
    bRemoved=TRUE; xQt 3[(Z  
    KeyCount--; evl -V>   
    break; DpL8'Dib  
   } #A <1aQ  
  } OKwOugi0  
 } !}&" W,,0  
 return bRemoved; r!/0 j)  
} ,J9}.}Hd  
/3^P_\,>f  
ehO:')XF  
  DLL中的钩子函数如下: u39FN?<^  
! gp}U#Yv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]O!s 'lC  
{ IKf`[_,t]  
 BOOL bProcessed=FALSE; ~mILA->F  
 if(HC_ACTION==nCode) ,# "(Z  
 { 4'At.<]jL  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {},;-%xE  
   switch(wParam) #w~0uCzQ@  
   {  3;BvnD7  
    case VK_MENU: r#~K[qb  
     MaskBits&=~ALTBIT; M4<+%EV}  
     break; _p4}<pG  
    case VK_CONTROL: R+. Nn  
     MaskBits&=~CTRLBIT; aV|k}H{wt  
     break; X!0kK8v  
    case VK_SHIFT: rye)qp|  
     MaskBits&=~SHIFTBIT; H%.zXQ4}n  
     break; k46gY7y,9  
    default: //judge the key and send message o8D{dS>,PL  
     break; Dt {')  
   } u_'nOle K  
   for(int index=0;index<MAX_KEY;index++){ 7s]Wq6  
    if(hCallWnd[index]==NULL) mmN|F$;r  
     continue; 0!IPcZjY7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?N#[<kd  
    { <$C<Ba?;?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !"(u_dFw  
     bProcessed=TRUE; k|ip?O  
    } W8.j /K:  
   } |LFUzq>j  
  } $eCGez<E  
  else if((lParam&0xc000ffff)==1){ //有键按下 X<K9L7/*  
   switch(wParam) "w^Nu6  
   { NTVHnSoHh  
    case VK_MENU: yam}x*O\xn  
     MaskBits|=ALTBIT; Mryn>b`cB  
     break; ruHrv"29  
    case VK_CONTROL: zn[QvY  
     MaskBits|=CTRLBIT; afy/K'~  
     break; d q pgf@  
    case VK_SHIFT: (. H ]|  
     MaskBits|=SHIFTBIT; x,-S1[#X;  
     break; ^cb)f_90  
    default: //judge the key and send message %ph"PR/t?  
     break; NY 4C@@"  
   } eRVY.E<  
   for(int index=0;index<MAX_KEY;index++){ Q(blW  
    if(hCallWnd[index]==NULL) 0k.v0a7%  
     continue; 9C?cm:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R%W@~o\p]  
    { `;}H%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $Br>KJ%'g  
     bProcessed=TRUE; W7W3DBKtSm  
    } - &NQ\W  
   } =1Ri]b  
  } A~XOK;sB  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 y,^";7U  
   for(int index=0;index<MAX_KEY;index++){ 'Y ,1OK  
    if(hCallWnd[index]==NULL) ennR@pg  
     continue; EM=xd~H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >kZ6f4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); hXPocP  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 @$EjD3Z-  
   } )ib7K1GJ  
  } _2#zeT5  
 } x!`b'U\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =g >.X9lr  
} UDVf@[[hN  
* *.:)  
  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: / =-6:L  
U>in2u 9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZWFG?8lJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g;l'VA3v  
YsZ{1W  
  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: M5F(<,n;  
,TEuM|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0~qf-x  
{ Z@}sCZ=#A  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) IX"ZS  
 { is9}ePC7Xu  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 uC- A43utv  
  SaveBmp(); "havi,m  
  return FALSE; :4%<Rp  
 } TeKC} NW  
 …… //其它处理及默认处理 '/ihL ^^@L  
} ;i.I&*t  
~:T3|  
kkT3 wP  
  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。 '!Hhd![\=|  
Ze#Jhn@  
  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。  NvUu.  
%)8d{1at  
  二、编程步骤 G4O,^ v;Q  
/%62X{=>;  
  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"; CdDH1[J  
3T" #T&eL  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; >~h>#{&  
r|l53I 5  
  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; 8oa)qaG1  
MJ1W*'9</W  
  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; "fRlEO[9  
|^Y*~d<H  
  5、 添加代码,编译运行程序。 XI]OA7Zis  
{An8/"bv}  
三、程序代码 F='Xj@&O  
?6 8$3;  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4,j4E@?pG9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) '&N: S-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ tceIA8d6  
#if _MSC_VER > 1000 N =x]A C,  
#pragma once 3?.6K0L  
#endif // _MSC_VER > 1000 W8Ke1( ws&  
#ifndef __AFXWIN_H__ 5tN%a>D%  
#error include 'stdafx.h' before including this file for PCH C]yvK}  
#endif Y*`:M(  
#include "resource.h" // main symbols <+<)xwOQ ]  
class CHookApp : public CWinApp ny278tr Q7  
{ |}M~ kJ)  
 public: en Pzy:C  
  CHookApp(); 'wCS6_K  
  // Overrides dD[v=Z_  
  // ClassWizard generated virtual function overrides bs:C1j\&  
  //{{AFX_VIRTUAL(CHookApp) )3k)2XF  
 public: JOA%Y;`<#  
  virtual BOOL InitInstance(); {[l'S  
  virtual int ExitInstance(); Iu)L3_+  
  //}}AFX_VIRTUAL {KW&wsI  
  //{{AFX_MSG(CHookApp)  <'g0il  
  // NOTE - the ClassWizard will add and remove member functions here. 3{.9O$  
  // DO NOT EDIT what you see in these blocks of generated code ! =@bXGMsV!  
  //}}AFX_MSG @).WIs  
  DECLARE_MESSAGE_MAP() vN{vJlpY  
}; w k-Mu\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2z.k)Qx!Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {%]NpFg#b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /AK*aRU^  
BOOL InitHotkey(); j zxf"X-  
BOOL UnInit(); @)aXNQY  
#endif vG'vgUo  
^% ~Et>C  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. T+ &x{+gZ  
#include "stdafx.h" `77;MGg*  
#include "hook.h" H @3$1h&YS  
#include <windowsx.h> ,gAr|x7_  
#ifdef _DEBUG 8.Pcr<  
#define new DEBUG_NEW 5*G8W\ $  
#undef THIS_FILE "uV0Oj9:  
static char THIS_FILE[] = __FILE__; nr 'YWW  
#endif d&GKfF  
#define MAX_KEY 100 J8qu]{0I"  
#define CTRLBIT 0x04 / t%"Dh 8x  
#define ALTBIT 0x02 7?kXgR[#d  
#define SHIFTBIT 0x01 w]]x[D]L  
#pragma data_seg("shareddata") zJB+C=]D7H  
HHOOK hHook =NULL; lB5[#z  
UINT nHookCount =0; Q%gY.n{=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey -9tXv+v?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT n:}MULy;  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4fU5RB7%  
static int KeyCount =0; S2{ ?W  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7|{%CckN  
#pragma data_seg() 0{{p.n8a~  
HINSTANCE hins; iTKG,$G  
void VerifyWindow(); 9M-NItFos  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #b]}cwd!  
//{{AFX_MSG_MAP(CHookApp) KweHY,  
// NOTE - the ClassWizard will add and remove mapping macros here. OTy 4"%  
// DO NOT EDIT what you see in these blocks of generated code! H|(*$!~e  
//}}AFX_MSG_MAP l*m]2"n]  
END_MESSAGE_MAP() hg86#jq%  
D@YM}HXuj  
CHookApp::CHookApp() S+e-b'++?  
{ 4n.i<K8K[  
 // TODO: add construction code here, sDh6 Uk  
 // Place all significant initialization in InitInstance *$WiJ3'(m  
} R&-W_v+  
)}zA,FOA*  
CHookApp theApp; [{.\UkV@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @Tj  6!v  
{ wTJMq`sY_  
 BOOL bProcessed=FALSE; e[py J.  
 if(HC_ACTION==nCode) n(F<  
 { =f{Z~`3  
  if((lParam&0xc0000000)==0xc0000000){// Key up ud~VQXZo  
   switch(wParam) OM"T)4z  
   { 2Dwt4V  
    case VK_MENU: hzf}_1  
     MaskBits&=~ALTBIT; G){1`gAhNJ  
     break; qLktMp_  
    case VK_CONTROL: KG./<"c  
     MaskBits&=~CTRLBIT; tIp\MXkTQ&  
     break; >5z`SZf  
    case VK_SHIFT: ?;r7j V/`j  
     MaskBits&=~SHIFTBIT; xBx?>nN  
     break; {<V|Gr  
    default: //judge the key and send message ^ 8Nr %NJ  
     break; e715)_HD  
   } EXM/>PG  
   for(int index=0;index<MAX_KEY;index++){ I$P7%}  
    if(hCallWnd[index]==NULL) Z#E#P<&d  
     continue; ysP/@;jC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "r `6c0Z  
    { P)o[p(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); I7-PF?  
     bProcessed=TRUE; \=: g$_l  
    } YUE 1 '}  
   } ,;- cz-,  
  } uC$4TnoQx.  
  else if((lParam&0xc000ffff)==1){ //Key down N`mC_)  
   switch(wParam)  9%hB   
   { @X / =.  
    case VK_MENU: MyR\_)P?  
     MaskBits|=ALTBIT; q|Tk+JH{5  
     break; @RG3*3(  
    case VK_CONTROL: 7!d<>_oH  
     MaskBits|=CTRLBIT; pmXWI`s  
     break; :.o0<  
    case VK_SHIFT: 0~I) /T  
     MaskBits|=SHIFTBIT; gQzF C&g  
     break; ~#xs `@{s  
    default: //judge the key and send message {>qrf:  
     break; 'k) P(H  
   } G`<1>%" F  
   for(int index=0;index<MAX_KEY;index++) Sf8Xj |u  
   { Wh&Z *J  
    if(hCallWnd[index]==NULL) pF{Ri  
     continue; X!'Xx8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =>TtX@Q{  
    { uqH! eN5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1JY90l$ME  
     bProcessed=TRUE; }T(q"Vf~  
    } "e?#c<p7  
   } Z-=7QK.\{  
  } nFOG=>c}  
  if(!bProcessed){ kxiyF$ 9  
   for(int index=0;index<MAX_KEY;index++){ JQv ZTwSI  
    if(hCallWnd[index]==NULL) #k]0[;1os  
     continue; v*p)"J *  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) )4O`%9=M&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^,r;/c9A8  
   } T{kwy3  
  } %bETr"Xom  
 } O[J+dWyp  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  [?(W7  
} KPK!'4,cu  
.}opmI  
BOOL InitHotkey() Q9 ",  
{ f\_Q+!^  
 if(hHook!=NULL){ ?-p aM5Q+  
  nHookCount++; v2<gkCK^  
  return TRUE; "lya|;  
 } %6?}gc_  
 else ~H."{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); f)fw87UPc  
  if(hHook!=NULL) D($UbT-v  
   nHookCount++; 1Vvx@1  
  return (hHook!=NULL); B(NL3WJ  
} '\qr=0aW  
BOOL UnInit() k18V4ATE]  
{ p#NZ\qJ  
 if(nHookCount>1){ vUExS Z^  
  nHookCount--; $fG/gYvI\  
  return TRUE; b .@dUuKz-  
 } "lAS <dq  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }z:=b8}  
 if(unhooked==TRUE){ 61 |xv_/  
  nHookCount=0; G7xjW6^T  
  hHook=NULL; ` &DiM@Sm  
 } qa#F}aGd  
 return unhooked; nr6U> KR^  
} =l{KYv  
\}c50}#0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $9$NX/P  
{ o*8 pM`uw  
 BOOL bAdded=FALSE; b&&'b )  
 for(int index=0;index<MAX_KEY;index++){ zh#uwT1u  
  if(hCallWnd[index]==0){ )f|6=x4  
   hCallWnd[index]=hWnd; X^)5O>>|t  
   HotKey[index]=cKey; h{9 pr  
   HotKeyMask[index]=cMask; 3j#F'M)s{  
   bAdded=TRUE; %oQj^r!Xd  
   KeyCount++; \|s/_35(  
   break; eGg#=l=  
  } 2j|Eh   
 } ObnB6ShKi  
 return bAdded; w=5qth7  
} jeNEC&J  
0cVXUTJ|W  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s6IuM )x  
{ "Y6mM_flq  
 BOOL bRemoved=FALSE; qlP=Y .H  
 for(int index=0;index<MAX_KEY;index++){ D:0PppE  
  if(hCallWnd[index]==hWnd){ Z]CH8GS~<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ pj`-T"Q  
    hCallWnd[index]=NULL; .`9KB3  
    HotKey[index]=0; wq#3f#3V  
    HotKeyMask[index]=0; ,\IZ/1  
    bRemoved=TRUE; Qw+">  
    KeyCount--; FB`HwE<  
    break; A>k;o0r  
   } -fv.ByyA  
  } fAi113q!  
 } R _%pR_\  
 return bRemoved; X"sN~Q.0  
} TgLlmU*qMU  
!ywc).]e  
void VerifyWindow() 5;*C0m2%i  
{ %K4-V5f  
 for(int i=0;i<MAX_KEY;i++){ lAQ&PPQ  
  if(hCallWnd!=NULL){  AHb   
   if(!IsWindow(hCallWnd)){ lHU$A;  
    hCallWnd=NULL; S/|8' x{<  
    HotKey=0; P:+:Cm<  
    HotKeyMask=0; RPu-E9g@  
    KeyCount--; 'n=D$j]X  
   } B5hGzplS  
  } K;~dZ  
 } l)Hu.1~  
} IM+PjYJ  
G[mYx[BTz  
BOOL CHookApp::InitInstance() h?b{{  
{ AWzpk }\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); MD,-<X)Qy  
 hins=AfxGetInstanceHandle(); K(?7E6\vO  
 InitHotkey(); )L?Tq"hy  
 return CWinApp::InitInstance(); [3s~Z8 pP  
} <Aa%Uwpc  
R *U>T$  
int CHookApp::ExitInstance() 8dv1#F|  
{ )`)cB)s  
 VerifyWindow(); AQ&;y&+QR  
 UnInit(); 9 }=Fdt  
 return CWinApp::ExitInstance(); e :#\Oh  
} GM5::M]fS  
c09uCito  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |G1U $p  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]T$~a8  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ B`vV[w?  
#if _MSC_VER > 1000 mVxS[Gq  
#pragma once Vrnx# j-U  
#endif // _MSC_VER > 1000 \oi=fu=}*  
;RR)C@n1  
class CCaptureDlg : public CDialog ^71sIf;+  
{ nPKj%g3h  
 // Construction OlP#|x*  
 public: ]!/1qF  
  BOOL bTray; Y!5-WX H  
  BOOL bRegistered; 'b-}KDP  
  BOOL RegisterHotkey(); 5yry$w$G)  
  UCHAR cKey; n@*NQ`(_  
  UCHAR cMask; @=$;^}JS|  
  void DeleteIcon(); UW\.!TV  
  void AddIcon(); JLjx4B\  
  UINT nCount; k]v a  
  void SaveBmp(); :5ji.g* 0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !nTq"d%(W  
  // Dialog Data @Fo0uy\ G  
  //{{AFX_DATA(CCaptureDlg) 8 }-"&-X  
  enum { IDD = IDD_CAPTURE_DIALOG }; )#1@@\< ^T  
  CComboBox m_Key; P? >p+dM  
  BOOL m_bControl; YYhRdU/g  
  BOOL m_bAlt; lO:[^l?F  
  BOOL m_bShift; :Bl $c,J  
  CString m_Path; nH;^$b'LZ  
  CString m_Number; !dZC-U~  
  //}}AFX_DATA !?]NMf_  
  // ClassWizard generated virtual function overrides !.9NJ2'8  
  //{{AFX_VIRTUAL(CCaptureDlg) *C$ W^u5h  
 public: <CeDIX t  
  virtual BOOL PreTranslateMessage(MSG* pMsg); m#Rll[  
 protected: v-OaH81&R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "S1+mSW>  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ucyxvhH^-  
  //}}AFX_VIRTUAL gg933TLu(Q  
  // Implementation H Jwj,SL  
 protected: 8USF;k  
  HICON m_hIcon; k kY*OA  
  // Generated message map functions 1SQ&m H/  
  //{{AFX_MSG(CCaptureDlg) )abo5   
  virtual BOOL OnInitDialog(); 7GpSWM6  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 68d(6?OgW  
  afx_msg void OnPaint(); e)O6k7U$  
  afx_msg HCURSOR OnQueryDragIcon(); nXXyX[c4e  
  virtual void OnCancel(); {um~]  
  afx_msg void OnAbout(); {=pf#E=  
  afx_msg void OnBrowse(); 7|*|xLrVY  
  afx_msg void OnChange(); O]`CSTv'_  
 //}}AFX_MSG  R:-^,/1  
 DECLARE_MESSAGE_MAP() !DXKn\aQf  
}; 4k}u`8 a  
#endif RaKL KZn  
/=i^Bgh4  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >tYptRP  
#include "stdafx.h" o^biO!4,  
#include "Capture.h" 1: XT r  
#include "CaptureDlg.h" QXniWJJ  
#include <windowsx.h> ^I@43Jy/  
#pragma comment(lib,"hook.lib") &K/5AH"q  
#ifdef _DEBUG nz~3o  
#define new DEBUG_NEW >}Za)  
#undef THIS_FILE Syo1Dq6z.  
static char THIS_FILE[] = __FILE__; uv eTx  
#endif L6O* aZ|  
#define IDM_SHELL WM_USER+1 {b}Ri&oEOH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <T,vIXwu+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NN>,dd3T  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; c\065#f!  
class CAboutDlg : public CDialog 9m/v^  
{ @/g%l1$`  
 public: lo5,E(7~h  
  CAboutDlg(); $_onSYWr  
  // Dialog Data ia?{]!7$  
  //{{AFX_DATA(CAboutDlg)  mR)Xq=  
  enum { IDD = IDD_ABOUTBOX }; 7LbBS:@3z_  
  //}}AFX_DATA YAYPof~A$l  
  // ClassWizard generated virtual function overrides cQ} ,q+GR~  
  //{{AFX_VIRTUAL(CAboutDlg) %4*-BCP  
 protected: Rt}H.D #  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iimTr_TEt  
  //}}AFX_VIRTUAL j'R{llZW  
  // Implementation mmE\=i~  
 protected: ph qx<N@  
  //{{AFX_MSG(CAboutDlg) ~oWCTj-  
  //}}AFX_MSG >hHjDYjbf  
  DECLARE_MESSAGE_MAP() 2~h! ouleY  
}; x1VBO.t=*  
[H<![Z1*r  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^K. d|z  
{ .fY1?$*6c  
 //{{AFX_DATA_INIT(CAboutDlg) ,@!io  
 //}}AFX_DATA_INIT +m8CN(c  
} |Ii[WfFA|J  
.0+=#G>  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7)SG#|v[$  
{ ,j E'd'$  
 CDialog::DoDataExchange(pDX); "*UN\VV+s  
 //{{AFX_DATA_MAP(CAboutDlg) 50kjX}  
 //}}AFX_DATA_MAP Mm7;'Zbg  
} I8~ .Vu2  
B?n 6o|8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {,xI|u2R  
 //{{AFX_MSG_MAP(CAboutDlg) Ck.LsL-  
 // No message handlers r&!Ebe-  
 //}}AFX_MSG_MAP 5^lFksZ  
END_MESSAGE_MAP() OD{()E?1B  
{&7%wZ"t_  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -7-r~zmr  
: CDialog(CCaptureDlg::IDD, pParent) @ByD=  
{ zNG]v?JAh  
 //{{AFX_DATA_INIT(CCaptureDlg) r:N =?X`N  
  m_bControl = FALSE; $[(amj-;l  
  m_bAlt = FALSE; +\Uq=@  
  m_bShift = FALSE; zy8Z68%E`*  
  m_Path = _T("c:\\"); @G'&7-(h*  
  m_Number = _T("0 picture captured."); im,H|u_f4  
  nCount=0; vX?MB  
  bRegistered=FALSE; ?OjZb'+=K  
  bTray=FALSE; omd oH?  
 //}}AFX_DATA_INIT lB)%s~P:s  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 z3Id8G&>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); IkWV|E  
} 2bv/ -^  
]F'o  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [p Y1\$,  
{ |; [XZ ZZ  
 CDialog::DoDataExchange(pDX); V8KdY=[  
 //{{AFX_DATA_MAP(CCaptureDlg) E^s<5BC;  
  DDX_Control(pDX, IDC_KEY, m_Key); t@(:S6d  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); yV.E+~y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *C~$<VYI  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); s2f6;Yc  
  DDX_Text(pDX, IDC_PATH, m_Path); EN2H[i+,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); %>io$o  
 //}}AFX_DATA_MAP V Zz>)Kz:  
} rd_!'pG  
JX)%iJq#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {)`tN&\  
//{{AFX_MSG_MAP(CCaptureDlg) q9 S V<qg  
 ON_WM_SYSCOMMAND() aw\0\'}  
 ON_WM_PAINT() w|,BTM:e  
 ON_WM_QUERYDRAGICON() QJ4=*tX)  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) C<B+!16  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /LK,:6  
 ON_BN_CLICKED(ID_CHANGE, OnChange) )lh Pl  
//}}AFX_MSG_MAP GbB :K2  
END_MESSAGE_MAP() e)M)q!nG  
1 !8 b9  
BOOL CCaptureDlg::OnInitDialog() w}rsboU  
{ sx^0*h-Qq  
 CDialog::OnInitDialog(); -\|S=< g  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `b:yW.#w3l  
 ASSERT(IDM_ABOUTBOX < 0xF000); ^yFtL(x,  
 CMenu* pSysMenu = GetSystemMenu(FALSE); k.n-JS  
 if (pSysMenu != NULL) #S|DoeFs  
 { # ? _8 *?  
  CString strAboutMenu; '$0~PH&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 7=@3cw H  
  if (!strAboutMenu.IsEmpty()) WKvG|YRDq  
  { o;"Phc.  
   pSysMenu->AppendMenu(MF_SEPARATOR); d:!A`sk7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); dWi:V 7t+  
  } #qDMUN*i  
 } ;&} rO.0  
 SetIcon(m_hIcon, TRUE); // Set big icon pd\x^F`sk.  
 SetIcon(m_hIcon, FALSE); // Set small icon V`& O`  
 m_Key.SetCurSel(0); 0-at#r:  
 RegisterHotkey(); ;r3Xh)k;  
 CMenu* pMenu=GetSystemMenu(FALSE); W[SZZV_(tu  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7 (kC|q\4M  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); h%PbM`:}6  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?}ly`Js  
 return TRUE; // return TRUE unless you set the focus to a control G?dxLRy.do  
} I-L:;~.  
_^MkC} 8  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) YwaWhBCIF  
{ b^^ .$Gu  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) AD>X'J u8  
 { 4S1\5C9  
  CAboutDlg dlgAbout; dxi5p!^^9  
  dlgAbout.DoModal(); 4apaUP=Jp  
 } 8nE}RD7bx  
 else Me2qOc^Z-  
 { FMEW['  
  CDialog::OnSysCommand(nID, lParam); 2Fc>6]:*  
 } Yaix\*II  
} jBMGm"NE  
<5E: ,<  
void CCaptureDlg::OnPaint() Nv5)A=6#AA  
{ o"j$*o=  
 if (IsIconic()) yllEg9L0z  
 { ^\Epz* cL  
  CPaintDC dc(this); // device context for painting d:8c}t2X  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Xy]Pmt  
  // Center icon in client rectangle 8)bqN$*h  
  int cxIcon = GetSystemMetrics(SM_CXICON); .K`EflN  
  int cyIcon = GetSystemMetrics(SM_CYICON); lPZYd 8  
  CRect rect; uD4j.%  
  GetClientRect(&rect); &w%--!T  
  int x = (rect.Width() - cxIcon + 1) / 2; EECuJ+T  
  int y = (rect.Height() - cyIcon + 1) / 2; G$A=Tu~  
  // Draw the icon h,zM*zA_  
  dc.DrawIcon(x, y, m_hIcon); b6UpE`\z  
 } 2bu>j1h  
 else mX5%6{],  
 {  `6xr:s  
  CDialog::OnPaint(); R3|r` ~@@  
 } enT[#f[{  
} ib-H jJ8  
Q N]y.(S)y  
HCURSOR CCaptureDlg::OnQueryDragIcon() Seh(G  
{ '.{_ 7U  
 return (HCURSOR) m_hIcon; -dS@ l'$  
} Q<>b3X>O  
Z=dM7Lj*  
void CCaptureDlg::OnCancel() \:4SN&I~  
{ 1) Nj.#)  
 if(bTray) 1ne3CA=  
  DeleteIcon(); K05U>151  
  CDialog::OnCancel(); SS6K7  
} [H@71+_Q  
U:0Ma 6<  
void CCaptureDlg::OnAbout() HCw,bRxm  
{ N/78Ub  
 CAboutDlg dlg; SQ DfDrYP  
 dlg.DoModal(); }<^QW't_Y  
} UM<!bNz`  
GH \ Sy  
void CCaptureDlg::OnBrowse() 0X:$ASocU  
{ K\FLA_J  
 CString str; Wv||9[Rd  
 BROWSEINFO bi; :gn&wi  
 char name[MAX_PATH]; ?I$-im  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); x~Dj2 F]  
 bi.hwndOwner=GetSafeHwnd(); hp`ZmLq/[  
 bi.pszDisplayName=name; i1S cXKO  
 bi.lpszTitle="Select folder"; p\R&vof*  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; H?rCIS0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [RF6mWQ  
 if(idl==NULL) wjfq"7Q  
  return; [HI$[ :[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); G6dUm_iB  
 str.ReleaseBuffer(); qOy0QZ#0  
 m_Path=str; wXtp(YwlH  
 if(str.GetAt(str.GetLength()-1)!='\\') Y?$  
  m_Path+="\\"; ( k,?)  
 UpdateData(FALSE); K^ ALE  
} O7p=N8V  
_u]%K-_  
void CCaptureDlg::SaveBmp() ?:h*=0>  
{ BOWOH  
 CDC dc; 5M/~ |"xk  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); `FEa(Q+s  
 CBitmap bm; J;=T"C&  
 int Width=GetSystemMetrics(SM_CXSCREEN); }|%1LL^pB  
 int Height=GetSystemMetrics(SM_CYSCREEN); je5[.VTM  
 bm.CreateCompatibleBitmap(&dc,Width,Height); H'JU5nE  
 CDC tdc; AvPPsN0  
 tdc.CreateCompatibleDC(&dc); H~^)^6)^T  
 CBitmap*pOld=tdc.SelectObject(&bm); ujzfy  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Z&79: 9=#>  
 tdc.SelectObject(pOld); : _tt9J  
 BITMAP btm; 0?}n(f!S  
 bm.GetBitmap(&btm); }=}wLm#&1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; I]DD5l}\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Lx tgf2r  
 BITMAPINFOHEADER bih; ~>HzAo9e  
 bih.biBitCount=btm.bmBitsPixel; ^,#m y<{  
 bih.biClrImportant=0; l*6Zh "o:  
 bih.biClrUsed=0; #?V rt,n  
 bih.biCompression=0; #y[U2s Se  
 bih.biHeight=btm.bmHeight; !-.GfI:q  
 bih.biPlanes=1;  vP=68muD  
 bih.biSize=sizeof(BITMAPINFOHEADER); o+B)  
 bih.biSizeImage=size; {}$Zff   
 bih.biWidth=btm.bmWidth; ?^M,Mt  
 bih.biXPelsPerMeter=0; z~ywFk}KGd  
 bih.biYPelsPerMeter=0; JXM]tV  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); </WeB3#6  
 static int filecount=0; c!_c, vwrn  
 CString name; AYgXqmH~+  
 name.Format("pict%04d.bmp",filecount++); DU0/if9.  
 name=m_Path+name; !?(7g2NP)  
 BITMAPFILEHEADER bfh; "4;nnq  
 bfh.bfReserved1=bfh.bfReserved2=0; 5nUJ9sqA  
 bfh.bfType=((WORD)('M'<< 8)|'B'); >mai v;  
 bfh.bfSize=54+size; 0/b  _T  
 bfh.bfOffBits=54; Qr9;CVW  
 CFile bf; Ps74SoD-  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @p L9a1PJv  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @phVfP"M  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5,pNqXRp  
  bf.WriteHuge(lpData,size); ocFk#FW  
  bf.Close(); aL( hWE  
  nCount++; D%abBE1  
 } IQRuqp KL  
 GlobalFreePtr(lpData); B*,)@h  
 if(nCount==1) _ i}W1i  
  m_Number.Format("%d picture captured.",nCount); TK fN`6  
 else @kqxN\DE  
  m_Number.Format("%d pictures captured.",nCount); =c'4rJ$+  
  UpdateData(FALSE); ?B1Zfu0  
} "FWx;65CR  
[/CGV8+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) U}RBgPX!  
{ y %Q. (  
 if(pMsg -> message == WM_KEYDOWN) x}yl Rg`[  
 { `8ac;b  
  if(pMsg -> wParam == VK_ESCAPE) W<r<K=`5P  
   return TRUE; <qwf"Ey  
  if(pMsg -> wParam == VK_RETURN) 7C|!Wno[;  
   return TRUE; ( Jk& U8y  
 } @kWL "yy,  
 return CDialog::PreTranslateMessage(pMsg); U X@%1W!8  
} 94rSB}b.O  
Uj):}xgi'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  X0VS a{  
{ L~Gr,i  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ rD].=.?1  
  SaveBmp(); iT>u&0B-  
  return FALSE; 1f`De`zXzr  
} eQuu\/z*H  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ C#kE{Qw10r  
 CMenu pop; QB*,+u4  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >R+-mP!nj  
 CMenu*pMenu=pop.GetSubMenu(0); |9#q7kM  
 pMenu->SetDefaultItem(ID_EXITICON); |O{N_-];.  
 CPoint pt; n#lbfN 4  
 GetCursorPos(&pt); >}+{;d  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (/e&m=~  
 if(id==ID_EXITICON) 2:*15RH3  
  DeleteIcon(); "do5@$p|  
 else if(id==ID_EXIT) ppyy0E^M  
  OnCancel(); Vu:ZG*^  
 return FALSE; ~"#0rPT  
} T$5wH )<  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ';tlV u  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) q Gk.7wf%  
 AddIcon(); @d WA1tM  
 return res; >jW**F  
} qyz%9 9  
 FA+HR  
void CCaptureDlg::AddIcon() v$y\X3)mB  
{ hX.cdt_?  
 NOTIFYICONDATA data; ;_,jy7lf  
 data.cbSize=sizeof(NOTIFYICONDATA); cNWmaCLN$  
 CString tip; 9@*pC@I)  
 tip.LoadString(IDS_ICONTIP); gP% <<yl  
 data.hIcon=GetIcon(0); )Te\6qM  
 data.hWnd=GetSafeHwnd(); =XfvPBA  
 strcpy(data.szTip,tip); 9xQ|Uad+%  
 data.uCallbackMessage=IDM_SHELL; D!`[fjs6A  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :Awwt0  
 data.uID=98; #{6VdWZ  
 Shell_NotifyIcon(NIM_ADD,&data); 5U2%X pO   
 ShowWindow(SW_HIDE); 2*cNd}qr  
 bTray=TRUE; YWIA(p8Qkk  
} G4|C227EO  
$DDO9  
void CCaptureDlg::DeleteIcon() +6WjOcu  
{ v}DNeIh~  
 NOTIFYICONDATA data; QbJ7$ ,4  
 data.cbSize=sizeof(NOTIFYICONDATA); -M{s zH  
 data.hWnd=GetSafeHwnd(); MT{1/A;`)  
 data.uID=98; i+`8$uz  
 Shell_NotifyIcon(NIM_DELETE,&data); C. .|O  
 ShowWindow(SW_SHOW); so` \e^d  
 SetForegroundWindow(); %DttkrhL  
 ShowWindow(SW_SHOWNORMAL); Y1 Ql_  
 bTray=FALSE; ug%7}&  
} 9O- otAGM  
 ]! ZZRe  
void CCaptureDlg::OnChange() Ku'a,\7z  
{ rO}1E<g (  
 RegisterHotkey(); ndQw>  
} Ox)<"8M  
PS~_a  
BOOL CCaptureDlg::RegisterHotkey() 61_PSScSY  
{ @.L#u#   
 UpdateData(); >:.c?{%g*  
 UCHAR mask=0; +`flIG3RV  
 UCHAR key=0; P*k n}:  
 if(m_bControl) /%g@ ;  
  mask|=4; EuHQp7  
 if(m_bAlt) %0&,_jM/9  
  mask|=2; _E9[4%f  
 if(m_bShift) tO&n$$  
  mask|=1; c6jVx_tt.  
  key=Key_Table[m_Key.GetCurSel()]; +184|nJ<2  
 if(bRegistered){ !}} )f/  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); hvI#D>Z!Yp  
  bRegistered=FALSE; )-I/ej^  
 } E|-oUz t  
 cMask=mask; $$$[Vn_H<  
 cKey=key; q"269W:  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); R.1.LB  
 return bRegistered; [VX5r1-F  
} ShQ!'[J  
-V2f.QE%  
  四、小结 JV,h1/a("  
_*z ^PkH  
  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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