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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: h$6'9rL&i  
  dh [kx  
  一、实现方法 V\{@c%xW  
M<*Tp^Y'  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: *i:8g(  
l>pB\<LL  
#pragma data_seg("shareddata") xRhGBb{@s  
HHOOK hHook =NULL; //钩子句柄 oq!\100  
UINT nHookCount =0; //挂接的程序数目 K\XQ E50  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 :( m, 06K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ]y=U"g  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?Fn y_{&^H  
static int KeyCount =0; ort*Ux)  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 CsycR@[  
#pragma data_seg() ?YZgH>7"  
q0Q[]|L  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 jQ%1lQ#R)  
Mog [,{w  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: C,W_0= !e  
A:GqR;;"x>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR HJ]e%og  
cKey,UCHAR cMask) *GBV[D[G,  
{ L/-SWid)  
 BOOL bAdded=FALSE; ol/@)k^s>  
 for(int index=0;index<MAX_KEY;index++){ nAl \9#M  
  if(hCallWnd[index]==0){ L FJ@4]%V  
   hCallWnd[index]=hWnd; +p Ywc0~  
   HotKey[index]=cKey; 0=6mb]VUi=  
   HotKeyMask[index]=cMask; 1t &_]q_  
   bAdded=TRUE; g|?}a]G  
   KeyCount++; %%?}db1n  
   break; U,v`md@PX  
  } |UWIV  
 } eZ]r"_?  
 return bAdded; /*Q3=Dse]  
} X=)L$Kd7  
//删除热键 m[2[9 bQ0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  ov,  
{ E=,5%>C0#%  
 BOOL bRemoved=FALSE; $poIWJMc  
 for(int index=0;index<MAX_KEY;index++){ p19(>|$J  
  if(hCallWnd[index]==hWnd){ U= f9b]Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ JluA?B7E  
    hCallWnd[index]=NULL; 36+/MvIT  
    HotKey[index]=0; kJf0..J[#<  
    HotKeyMask[index]=0; D3dh,&KO\  
    bRemoved=TRUE; *kK +Nvt8s  
    KeyCount--; E.NfVeq  
    break; 8WP"~Js!  
   } xPUukmG:B  
  } @^YXE,  
 } r^C(|Vx  
 return bRemoved; IO8 @u;&  
} tyW[i8)O}  
i_AD3Jrs  
Z'k?lkB2i  
  DLL中的钩子函数如下: leNX5 sX  
$+4 4US  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _^b\#Jz4U3  
{ ]rY9t@  
 BOOL bProcessed=FALSE; cW0\f5[/  
 if(HC_ACTION==nCode) L9Zz-Dr s  
 { dba_(I~y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 <BBzv-?D  
   switch(wParam) &glh >9:G  
   {  b1IAp>*2l  
    case VK_MENU: C7m/<  
     MaskBits&=~ALTBIT; `&fW<5-  
     break; %{r3"Q=;W  
    case VK_CONTROL: C,> n  
     MaskBits&=~CTRLBIT; ;rL1[qwk  
     break; Z P|k3   
    case VK_SHIFT: BRu}"29  
     MaskBits&=~SHIFTBIT;  jMI30  
     break; -WyB2$!(  
    default: //judge the key and send message @YaI5>,/  
     break; 3A"TpR4f`  
   } |;Jt * _  
   for(int index=0;index<MAX_KEY;index++){ s1Wn.OGR4  
    if(hCallWnd[index]==NULL) KV;q}EyG  
     continue; ,Q Ge=Exn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h2mHbe43  
    { 1qn/*9W}=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *!`&+w  
     bProcessed=TRUE; 8o,0='U  
    } rBL2A  
   } w0$+v/  
  } p</t##]3ks  
  else if((lParam&0xc000ffff)==1){ //有键按下 E3S0u7 Es  
   switch(wParam) 7vPG b:y  
   { `]GL3cIh:  
    case VK_MENU: $/Q\B(X3  
     MaskBits|=ALTBIT; P;gd!Yl<-  
     break; A 9l d9R  
    case VK_CONTROL: N|)e {|k  
     MaskBits|=CTRLBIT; 94 6r#`q  
     break; @ kv~2m  
    case VK_SHIFT: Xu#?Lw  
     MaskBits|=SHIFTBIT; !JDuVqW  
     break; :2{ [f+  
    default: //judge the key and send message 98{n6$\  
     break; LzB*d  
   } zFwO(  
   for(int index=0;index<MAX_KEY;index++){ hNp.%XnnZ  
    if(hCallWnd[index]==NULL) ,~K4+ t_  
     continue; GsqO^SV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hH?ke(&=f  
    { r9-)+R J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); c8cGIAOY)  
     bProcessed=TRUE; 7tY~8gQel  
    } L{c\7  
   } $@dPIq4o;}  
  } K~8!Gh{h]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 xtXK3[s  
   for(int index=0;index<MAX_KEY;index++){ Lg6>\Z4  
    if(hCallWnd[index]==NULL) JQ\o[t  
     continue; <|a9r: [  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?3iN)*Ut  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .Ag)/Xm(?  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 QVN @B[9  
   } @y# u!}  
  } ^DR`!.ttr  
 } 00A2[gO9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); UWBR5  
} @v}M\$N?  
sQY0Xys<4  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: mw=keY9]  
'KNUPi|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [#2z=Xg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `&A-m8X  
{E>(%vD  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ? ~~,?Uxw!  
NVo =5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <ZeZq  
{ D)JI11a<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 7(5 wP(  
 { }9&~+Q2  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 9t0NO-a  
  SaveBmp(); n11eJEtm  
  return FALSE; 9uY$@7qH  
 } > bSQ}kXe  
 …… //其它处理及默认处理 X57\sggK  
} " 1$hfs  
p \,PY  
sMb+4{W&6  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ]3yaIlpD1  
>K;C?gHo  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ljj}X JQ  
<F5x}i~(C  
  二、编程步骤 N%QVkuCbM  
&#[6a&9#[A  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; sMqAuhw$.  
rIF6^?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; *ps")?tlC  
6rzXM`cs  
  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; 9m_Hm')VG  
p< jM%fbZk  
  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; ais"xm<V  
B976{;QvXV  
  5、 添加代码,编译运行程序。 {= l 9{K`~  
09rbu\h  
三、程序代码 yi3Cd@t({{  
h{M.+I$}C  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL e? !A]2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "zBYhZr  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ FDO$(&  
#if _MSC_VER > 1000 D7b] ;Nf\  
#pragma once Ja#ti y  
#endif // _MSC_VER > 1000 :+\B|*T2.L  
#ifndef __AFXWIN_H__ VSa#X |z  
#error include 'stdafx.h' before including this file for PCH wloQk(T<W  
#endif gS4@3BOw&.  
#include "resource.h" // main symbols {%3sj"suB  
class CHookApp : public CWinApp f\gN+4)  
{ `G^MTDp?L+  
 public: VE5M}kDCZ  
  CHookApp(); '}NQ`\k  
  // Overrides &7t3D?K'qX  
  // ClassWizard generated virtual function overrides ]l4# KI@  
  //{{AFX_VIRTUAL(CHookApp) P_ x9:3  
 public: ey>V^Fj  
  virtual BOOL InitInstance(); r@Tq-o  
  virtual int ExitInstance(); 0SLS;s.GX  
  //}}AFX_VIRTUAL s@vHU4  
  //{{AFX_MSG(CHookApp) rXlJW]i  
  // NOTE - the ClassWizard will add and remove member functions here. WfE,U=e*  
  // DO NOT EDIT what you see in these blocks of generated code ! I= 'S).  
  //}}AFX_MSG |/-H:\5  
  DECLARE_MESSAGE_MAP() n$}Cj}eju  
}; li?RymlF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %-eags~sUC  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U#W9]il$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #Y;_W;#  
BOOL InitHotkey(); X8(, ,>_  
BOOL UnInit(); @e_<OU  
#endif =tE7XC3X_  
\d#|n u  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. jN43vHm\Y9  
#include "stdafx.h"  &(Ot(.  
#include "hook.h" u*J,3o} <  
#include <windowsx.h> 1FiFP5  
#ifdef _DEBUG K7H` Yt  
#define new DEBUG_NEW (\<#fkeH  
#undef THIS_FILE 3jB5F0^r1  
static char THIS_FILE[] = __FILE__; k-&fPEjG  
#endif h}o7/p  
#define MAX_KEY 100 +5:oW~ ;  
#define CTRLBIT 0x04 yY$:zc"J  
#define ALTBIT 0x02 yH0BNz8V  
#define SHIFTBIT 0x01 3-5X^!C  
#pragma data_seg("shareddata") -_RMiGM?T  
HHOOK hHook =NULL; Oy^)lF/  
UINT nHookCount =0; ,f;YJHEx8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey :Ojsj_Z;;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ~]_g q;bG  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey d)&}% 2ku  
static int KeyCount =0; Z&!5'_9{V  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift S-\;f jh  
#pragma data_seg() ')Drv)L  
HINSTANCE hins; rmOcA  
void VerifyWindow(); X>`e(1`_O  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) prx)Cfv  
//{{AFX_MSG_MAP(CHookApp) Z2,[-8,Kx  
// NOTE - the ClassWizard will add and remove mapping macros here. [80L|?, *  
// DO NOT EDIT what you see in these blocks of generated code! P<@V  
//}}AFX_MSG_MAP 8e9ZgC|  
END_MESSAGE_MAP() t_PAXj  
y JJNr]oq  
CHookApp::CHookApp() CfoT$g  
{ ? L A>5  
 // TODO: add construction code here, 2/K38t'-  
 // Place all significant initialization in InitInstance W9ZfD~(3-  
} oyS43/."  
G/:;Qig  
CHookApp theApp; A[F tPk{k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %\5d?;   
{ {uQp$`  
 BOOL bProcessed=FALSE; i,DnXgmz@  
 if(HC_ACTION==nCode) k<098F  
 { }&Gt&Hm>K  
  if((lParam&0xc0000000)==0xc0000000){// Key up 9b8ZOk'9_  
   switch(wParam) #R<ErX)F  
   { 478gl o  
    case VK_MENU: -c"nx$  
     MaskBits&=~ALTBIT; U&uop$/Cq  
     break; 1d4?+[)gUv  
    case VK_CONTROL: ]D@_cxud3  
     MaskBits&=~CTRLBIT; 8%qHy1  
     break; `J%iFm/5*  
    case VK_SHIFT: f,'gQ5\ X3  
     MaskBits&=~SHIFTBIT; XANPI|  
     break; df=G}M(  
    default: //judge the key and send message x4&<Vr  
     break; =@F1J7  
   } ?=X G#we  
   for(int index=0;index<MAX_KEY;index++){ XN@F6Gj  
    if(hCallWnd[index]==NULL) biy1!r  
     continue; $n30[P@p;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3_:J`xX(4  
    { D\}A{I92F4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); TmZ% ;TN  
     bProcessed=TRUE; {_GhS%  
    } UQmdm$.  
   } 8{@0p"re@  
  } =.Tc l"O[  
  else if((lParam&0xc000ffff)==1){ //Key down Oq-O|qJj  
   switch(wParam) MCBZq\c  
   { Dp)5u@I  
    case VK_MENU: "enGWI H  
     MaskBits|=ALTBIT; KiXRBFo  
     break;  F'!pM(+  
    case VK_CONTROL: ]m _<lRye  
     MaskBits|=CTRLBIT; >h?!6L- d  
     break; K"%_q$[YQ  
    case VK_SHIFT: 'P1I-ue  
     MaskBits|=SHIFTBIT; +K6j p  
     break; Z2HH&3HA  
    default: //judge the key and send message `Ap<xT0H  
     break; MN wMF  
   } }YiE} +VW|  
   for(int index=0;index<MAX_KEY;index++) D%CKkQ<u2  
   { ~J :cod  
    if(hCallWnd[index]==NULL) C,2k W`[V  
     continue; 0+\%os V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %r1NRg8  
    { f,Z* o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ak :Y<}  
     bProcessed=TRUE; mBQA~@ }  
    } .c+NsI9}  
   } l :e&w(1H  
  } 7+!4pf  
  if(!bProcessed){ Bu[sSoA  
   for(int index=0;index<MAX_KEY;index++){ avJ%J"j8z  
    if(hCallWnd[index]==NULL) 8`QbUQ6  
     continue; xSnkv,my<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) k0@b"y*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P2U^%_~  
   } b0QC91   
  } PV[ Bqt  
 } fi |k)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); JDp"!x{O  
} zEHX:-f8  
<'{*6f@n  
BOOL InitHotkey() 6ol*$Q"z  
{ 'T!^H  
 if(hHook!=NULL){ Pdq}~um3{  
  nHookCount++; /2%646  
  return TRUE; })v`` +  
 } )=~OP>7B  
 else c#-o@`Po  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); v- 793pr  
  if(hHook!=NULL) z( 00"ei  
   nHookCount++; >-%tvrS%  
  return (hHook!=NULL); /6K9? /  
} 2=\} 0  
BOOL UnInit() Nk#[~$Q-1  
{ 3FD6.X>x  
 if(nHookCount>1){ 0Yzm\"Ggv  
  nHookCount--; jN[P$} #b`  
  return TRUE; F gi&CJ8Q  
 } HLlp+;CF><  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $(3mpQAg  
 if(unhooked==TRUE){ |n*nByL/  
  nHookCount=0; U*p;N,SjQ  
  hHook=NULL; aEL^N0\d  
 } `(2Y%L(r  
 return unhooked; CXI%8eFXe$  
} J~}%j.QQ7  
^~ 95q0hq:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5_H`6-q  
{ _l{`lQ}  
 BOOL bAdded=FALSE; *VuiEBG  
 for(int index=0;index<MAX_KEY;index++){ zs=[C+Z\  
  if(hCallWnd[index]==0){ [>IV#6$  
   hCallWnd[index]=hWnd; '<Fr}Cn  
   HotKey[index]=cKey; !_yWe  
   HotKeyMask[index]=cMask; %1oh+'ES F  
   bAdded=TRUE; sGAOK%28  
   KeyCount++; [3@Pu.-I+M  
   break; eYpK!9  
  } y7X2|$9z-  
 } R^hlfKnt  
 return bAdded; ><&>JgM  
} ;4MC/Q/  
^MXW,xqb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y#B4m`9  
{ H Q_IQ+  
 BOOL bRemoved=FALSE; ++gWyzD  
 for(int index=0;index<MAX_KEY;index++){ 762c`aP_(  
  if(hCallWnd[index]==hWnd){ _ SuW86  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;h7W(NO~z  
    hCallWnd[index]=NULL; hI$IBf>  
    HotKey[index]=0; -eQ>3x&3r  
    HotKeyMask[index]=0; *!m\%*y{  
    bRemoved=TRUE; -/g<A~+i]$  
    KeyCount--; Sc.@u3  
    break; >z"\l  
   } _spW~"|G  
  } ,pTj'I  
 } )8Q;u8jm1  
 return bRemoved; j*6>{_[  
} Ue?mb$ykC.  
=$w QA  
void VerifyWindow() K!<3|d  
{ 83i;:cn  
 for(int i=0;i<MAX_KEY;i++){ ja-,6*"k  
  if(hCallWnd!=NULL){ @'> Ul!.]  
   if(!IsWindow(hCallWnd)){ 2gN78#d  
    hCallWnd=NULL; .rcXxV@f  
    HotKey=0; 59l9^<{A  
    HotKeyMask=0; Clo}kdkd_  
    KeyCount--; H#+2l?D:"  
   } -U BH,U  
  } 9<|nJt  
 } H "; !A=0  
} 8 U<$u,WS  
\dHdL\f  
BOOL CHookApp::InitInstance() sJ>JHv  
{ riu_^!"Z_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?^by3\,VZ  
 hins=AfxGetInstanceHandle(); O' ~>AC5{  
 InitHotkey(); o'KBe%@/  
 return CWinApp::InitInstance(); :#zVF[Y(2  
} O:{N5+HVG  
_, r6t  
int CHookApp::ExitInstance() o]<@E uG  
{ {5NE jUu{j  
 VerifyWindow(); Jwtt&" c0.  
 UnInit(); B;A< pNT  
 return CWinApp::ExitInstance(); C9j3|]nyL  
} H?4t\pSS  
KX^!t3l6  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file t!&p5wJ*Q  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) !CUy{nV  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ "MPr'3  
#if _MSC_VER > 1000 $lAQcG&Q  
#pragma once :m[HUh  
#endif // _MSC_VER > 1000 3n)\D<f]#  
1Xkl.FcFw  
class CCaptureDlg : public CDialog g/W&Ap;qVL  
{ Da)H/3ii  
 // Construction (Rs|"];?Z  
 public: p;<aZ&@O  
  BOOL bTray; 9TU B3x^  
  BOOL bRegistered; S^:7V[=EgI  
  BOOL RegisterHotkey(); =KW~k7TaN  
  UCHAR cKey; A5IW[Gu!  
  UCHAR cMask; w\}Q.$@  
  void DeleteIcon(); \GdsQAF"  
  void AddIcon(); M!b-;{;'  
  UINT nCount; W5(.Hub}  
  void SaveBmp(); m0,TH[HWGF  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~(-df>  
  // Dialog Data mum4Uj  
  //{{AFX_DATA(CCaptureDlg) cq4sgQ?sW  
  enum { IDD = IDD_CAPTURE_DIALOG }; b ~C^cM  
  CComboBox m_Key; xxZO{_q  
  BOOL m_bControl; XNr8,[c  
  BOOL m_bAlt; 9`Y\`F#}q  
  BOOL m_bShift; rebWXz7  
  CString m_Path; !a7YM4D  
  CString m_Number; _ YcIG OL  
  //}}AFX_DATA CTf39R|7_  
  // ClassWizard generated virtual function overrides ,aU8. J_U  
  //{{AFX_VIRTUAL(CCaptureDlg) |H'wDw8  
 public: A,;[9J2\&  
  virtual BOOL PreTranslateMessage(MSG* pMsg); m~`f0  
 protected: 4Jk[X>I~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o<L=l Q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2rrC y C  
  //}}AFX_VIRTUAL Z!z#+G  
  // Implementation |o#pd\  
 protected: -uhg7N[3  
  HICON m_hIcon; =GL^tAUJ  
  // Generated message map functions ]owcx=5q%'  
  //{{AFX_MSG(CCaptureDlg) ~kOXMLRg  
  virtual BOOL OnInitDialog(); 2SXy)m !  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); t $u.  
  afx_msg void OnPaint(); NI2-*G_M  
  afx_msg HCURSOR OnQueryDragIcon(); I^?hVH  
  virtual void OnCancel(); )rbcY0q  
  afx_msg void OnAbout(); N 8pzs"  
  afx_msg void OnBrowse(); feT.d +Fd  
  afx_msg void OnChange(); [-hsG E  
 //}}AFX_MSG @ 5V3I^  
 DECLARE_MESSAGE_MAP() ;edt["Eu  
}; ,L;%-}#$  
#endif G8@LH   
X-F:)/$xG  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file J8@7 5p9  
#include "stdafx.h" !4}Wp.  
#include "Capture.h" HEs.pET\  
#include "CaptureDlg.h" 13MB1n  
#include <windowsx.h> _ {mG\*q  
#pragma comment(lib,"hook.lib") d$PQb9Q+f  
#ifdef _DEBUG Df}3^J~JX  
#define new DEBUG_NEW "[2D&\$  
#undef THIS_FILE a!mdL|eA@  
static char THIS_FILE[] = __FILE__; ,Ad{k   
#endif ,H5o/qNU`{  
#define IDM_SHELL WM_USER+1 wmaj[e,h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QV_Ep8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _MzdbUb5,  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; gjPbhY=C[  
class CAboutDlg : public CDialog wyUfmk_}  
{ : G0^t  
 public: FK,Jk04on  
  CAboutDlg(); dRXdV7-!  
  // Dialog Data x}jiHV@=  
  //{{AFX_DATA(CAboutDlg) gFw- P#t  
  enum { IDD = IDD_ABOUTBOX };  m8z414o  
  //}}AFX_DATA FfibR\dhY  
  // ClassWizard generated virtual function overrides ~uweBp~O  
  //{{AFX_VIRTUAL(CAboutDlg) {AO`[  
 protected: ]MRQcqbpqL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^e:rRk7 &  
  //}}AFX_VIRTUAL M6*8}\  
  // Implementation r&O:Bt}x  
 protected: csms8J  
  //{{AFX_MSG(CAboutDlg) 3.?B')  
  //}}AFX_MSG E>NL/[1d  
  DECLARE_MESSAGE_MAP() v$EgVc K  
}; j?s+#t  
c3|/8  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) cQ`+ A|q  
{ 0 rilg  
 //{{AFX_DATA_INIT(CAboutDlg) (d}z>?L  
 //}}AFX_DATA_INIT S3Sn_zqG  
} Kz9h{ Tu4  
IK|W^hH\8  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ZN-5W|' O  
{ SkMBdkS9z[  
 CDialog::DoDataExchange(pDX); $6yr:2Xvt  
 //{{AFX_DATA_MAP(CAboutDlg) XV0t 8#T2  
 //}}AFX_DATA_MAP 42 &m)  
} L`0}wR?+  
Z=y^9]  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \ Q0-yNt  
 //{{AFX_MSG_MAP(CAboutDlg) (#VF>;;L  
 // No message handlers Bt1 &C?_$T  
 //}}AFX_MSG_MAP "(^1Dm$(  
END_MESSAGE_MAP() Iw;J7[hJ&$  
Avo"jN*<d  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y )9]I6n7  
: CDialog(CCaptureDlg::IDD, pParent) QTuj v<|  
{ m|cT)-  
 //{{AFX_DATA_INIT(CCaptureDlg) tC'@yX  
  m_bControl = FALSE; ^|h})OHV  
  m_bAlt = FALSE; DX4"}w  
  m_bShift = FALSE; he1OLk  
  m_Path = _T("c:\\"); *Q:EICDE7  
  m_Number = _T("0 picture captured."); r Q$Jk[Y  
  nCount=0; ~riV9_-  
  bRegistered=FALSE; 2ZZF hj  
  bTray=FALSE; t 4tXLI;'  
 //}}AFX_DATA_INIT 2 NrMse  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32  o0Pc^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +}@6V4BRn  
} Jz'8|o;^  
J3#  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,K[}Bz  
{ 6$"0!fl>  
 CDialog::DoDataExchange(pDX); "\u_gk{g  
 //{{AFX_DATA_MAP(CCaptureDlg) 'UL"yM  
  DDX_Control(pDX, IDC_KEY, m_Key); O(Vi/r2:e  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); } l4d/I  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 4.0JgX  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); o 2sOf  
  DDX_Text(pDX, IDC_PATH, m_Path); Q.]RYv}\  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ziBg'  
 //}}AFX_DATA_MAP L?p,Sy<RI  
} mtu`m6Xix  
a]u1_ $)  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vW:XM0  
//{{AFX_MSG_MAP(CCaptureDlg) 6=xbi{m$  
 ON_WM_SYSCOMMAND() \IG"Te  
 ON_WM_PAINT() 4'ymPPY  
 ON_WM_QUERYDRAGICON() Xv1mjHZCC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) qOd*9AS'|M  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ,c_NXC^X?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 1%,AU  
//}}AFX_MSG_MAP K\]I@UTwq  
END_MESSAGE_MAP() ^qD@qJ  
|XdkJv]  
BOOL CCaptureDlg::OnInitDialog() H3Z"u  
{ _/zK ^S)  
 CDialog::OnInitDialog(); 'dTg\ Qv  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .ko}m{  
 ASSERT(IDM_ABOUTBOX < 0xF000); } I;5yk,o  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ><Z`) }f  
 if (pSysMenu != NULL) ;p}X]e l}  
 { D/=  AU  
  CString strAboutMenu; auP6\kpMe  
  strAboutMenu.LoadString(IDS_ABOUTBOX); GMO|A.bzzN  
  if (!strAboutMenu.IsEmpty()) . |g67PH=  
  { A(>kp=~  
   pSysMenu->AppendMenu(MF_SEPARATOR); ]jL`*tI\S  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); rM?ox  
  } V=g<3R&  
 }  j,c8_;X!  
 SetIcon(m_hIcon, TRUE); // Set big icon sTALOL<  
 SetIcon(m_hIcon, FALSE); // Set small icon y $K#M  
 m_Key.SetCurSel(0); ;+/[<bvd"  
 RegisterHotkey(); R0!qweGi@  
 CMenu* pMenu=GetSystemMenu(FALSE); 7iJ=~po:o  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ie%twc  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "L p"o  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); =Nj58l  
 return TRUE; // return TRUE unless you set the focus to a control %7*Y@k-)o  
} 5%E.UjC  
47c` ) *Hc  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^,.G<2Kx&  
{ ^?3e?Q?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ird q51{G  
 {  Py)'%e  
  CAboutDlg dlgAbout; uBe1{Z  
  dlgAbout.DoModal(); -}O>m}l  
 } 0Tm"Zh?B|  
 else 5c~OG6COx  
 { FOU^Wcop%  
  CDialog::OnSysCommand(nID, lParam); mjd9]HgN  
 } J0hY~B~X  
}  #' =rv  
H' [#x2  
void CCaptureDlg::OnPaint() ) !!xvyc  
{ ul',!js?  
 if (IsIconic()) 1JU1XQi  
 { aDik1Q  
  CPaintDC dc(this); // device context for painting h*qoe(+ZD  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?OU+)kgzh  
  // Center icon in client rectangle x>@+lV'O  
  int cxIcon = GetSystemMetrics(SM_CXICON); 2_4m}T3   
  int cyIcon = GetSystemMetrics(SM_CYICON); :  Jh  
  CRect rect; J6H3X;vxQw  
  GetClientRect(&rect); 79>8tOuo  
  int x = (rect.Width() - cxIcon + 1) / 2; kXq*Jq  
  int y = (rect.Height() - cyIcon + 1) / 2; wb>>bV+U  
  // Draw the icon 1z\>>N$7B  
  dc.DrawIcon(x, y, m_hIcon); T F!Lp:  
 } IJ%S[>  
 else  jJjD)  
 { *Iu .>nw  
  CDialog::OnPaint(); Zh WtY  
 } # Z*nc0C  
} a?IL6$z  
Bpjwc<U  
HCURSOR CCaptureDlg::OnQueryDragIcon() ]byj[Gd  
{ q >9F21W  
 return (HCURSOR) m_hIcon; [p +h b  
} XMM@EN  
jF'azlT  
void CCaptureDlg::OnCancel() {GS7J  
{ `NC{+A  
 if(bTray) p[QF3)9F  
  DeleteIcon(); su`] l"[,]  
  CDialog::OnCancel(); !Z7 ~R sdm  
} ql%>)k /x  
&pZUe`3  
void CCaptureDlg::OnAbout() uW&P1 'X  
{ ?D#]g[6  
 CAboutDlg dlg; MR90}wXE  
 dlg.DoModal(); ]3iu-~  
} |4i,Vkfhe  
7/;Xt&  
void CCaptureDlg::OnBrowse() =W9;rQm  
{ k!]Tg"]JAh  
 CString str; 2w=0&wG4K  
 BROWSEINFO bi; x@I@7Pvo3  
 char name[MAX_PATH]; m6bI<C3^5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `A\ !Gn?   
 bi.hwndOwner=GetSafeHwnd(); y?-wjJS>  
 bi.pszDisplayName=name; T|p$Ddt`+  
 bi.lpszTitle="Select folder"; 'iN8JO>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; c7jft|4S  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z\E3i  
 if(idl==NULL) ?o h3t  
  return; ChLU(IPo6  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); V(3udB@K  
 str.ReleaseBuffer(); (U/xpj}  
 m_Path=str; ;bd\XHwMUP  
 if(str.GetAt(str.GetLength()-1)!='\\') 63QSYn,t  
  m_Path+="\\"; a$I; L  
 UpdateData(FALSE); $S$%avRX  
} Aa&3x~3+  
5Mb1==/R  
void CCaptureDlg::SaveBmp() V#W(c_g  
{ TA=Ij,z~  
 CDC dc; S:] w@$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); nMc d(&`N  
 CBitmap bm; EIl _QV6  
 int Width=GetSystemMetrics(SM_CXSCREEN); a%f5dj+  
 int Height=GetSystemMetrics(SM_CYSCREEN); :L9\`&}FS  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (jkjj7a  
 CDC tdc; {M]m cRB(  
 tdc.CreateCompatibleDC(&dc); l\5}\9yS  
 CBitmap*pOld=tdc.SelectObject(&bm); 5I{YsM  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3Gt'<E|"  
 tdc.SelectObject(pOld); n<7#?X7  
 BITMAP btm; M`umfw T  
 bm.GetBitmap(&btm); H7)(<6b,z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;w?zmj<Dm  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8oY0?|_Bx  
 BITMAPINFOHEADER bih; #]I:}Q51  
 bih.biBitCount=btm.bmBitsPixel; 6^['g-\2  
 bih.biClrImportant=0; pTmG\wA~$  
 bih.biClrUsed=0; +D1;_DU  
 bih.biCompression=0; +bd/*^  
 bih.biHeight=btm.bmHeight; MQ"<r,o?:  
 bih.biPlanes=1; cGC&O%`i,\  
 bih.biSize=sizeof(BITMAPINFOHEADER); A 20_a;V  
 bih.biSizeImage=size; .+aSa?h_  
 bih.biWidth=btm.bmWidth; P/t$xqAL  
 bih.biXPelsPerMeter=0; A]B D2   
 bih.biYPelsPerMeter=0; f7XmVCz1  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); p`{9kH1me  
 static int filecount=0; $,icKa   
 CString name; [HIg\N$I8C  
 name.Format("pict%04d.bmp",filecount++); k+-u 4W   
 name=m_Path+name; CQsVGn{x  
 BITMAPFILEHEADER bfh; 8Md*9E#J("  
 bfh.bfReserved1=bfh.bfReserved2=0; <"CG%RGP  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =Ze~6vS,  
 bfh.bfSize=54+size; ,Mc}U9)F  
 bfh.bfOffBits=54; &nj@t>5Bs$  
 CFile bf; $|z8WCJ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =bf-+gZD  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ~v9\4O  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @q5!3Nz  
  bf.WriteHuge(lpData,size); oHu0] XA  
  bf.Close(); 2NsI3M4$8  
  nCount++; (a`z:dz}  
 } k  `.-PU  
 GlobalFreePtr(lpData); fYx$3a.  
 if(nCount==1) m+DkO{8F  
  m_Number.Format("%d picture captured.",nCount); f? [y-  
 else y S7[=S  
  m_Number.Format("%d pictures captured.",nCount); [F+lVb  
  UpdateData(FALSE); Wuye:b!  
} Lc*i[J<s  
^']xkS  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) rtf>\j+  
{ suPQlU>2sj  
 if(pMsg -> message == WM_KEYDOWN) ]=q?= %H  
 { tb&{[|O^  
  if(pMsg -> wParam == VK_ESCAPE) Fg5c;sls  
   return TRUE; ^b;.zhp8;N  
  if(pMsg -> wParam == VK_RETURN) -YHlVz  
   return TRUE; ,/:#=TuYm  
 } l $d4g?Z  
 return CDialog::PreTranslateMessage(pMsg); <+sv7"a  
} #(bMZ!/(  
4<Bj;1*4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kHX- AsRc  
{ 5@Ot@o  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !K(0)~u  
  SaveBmp(); ]_|qv1K6  
  return FALSE; O,9KhX+  
} b V;R}3)  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O>|Q Zd  
 CMenu pop; Q?7U iTZ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); SMqJMirR  
 CMenu*pMenu=pop.GetSubMenu(0); .0.Ha}{6b  
 pMenu->SetDefaultItem(ID_EXITICON); gGe `w  
 CPoint pt; F7#   
 GetCursorPos(&pt); x1$fkNu  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); hXbb+j  
 if(id==ID_EXITICON) N$>g)Ml?  
  DeleteIcon(); q+e'=0BHd:  
 else if(id==ID_EXIT) R(r89bTQ  
  OnCancel(); bNY_V;7Kw`  
 return FALSE;  ~;il{ym  
} mm\J]Cc`  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `IkWS7|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) s+C&\$E  
 AddIcon(); `dn|n I2  
 return res;  U`IDZ{g  
} GvF~h0wMt  
&`pd&U{S*  
void CCaptureDlg::AddIcon() 8>6+]]O  
{ o}7`SYn  
 NOTIFYICONDATA data; {Z1j>h$  
 data.cbSize=sizeof(NOTIFYICONDATA); ui YZk3  
 CString tip; q*?LXKi  
 tip.LoadString(IDS_ICONTIP); /u*((AJ?Qv  
 data.hIcon=GetIcon(0); ggJn oL  
 data.hWnd=GetSafeHwnd(); O|?>rK  
 strcpy(data.szTip,tip); jUI'F4.5x-  
 data.uCallbackMessage=IDM_SHELL; DP &,jU6  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; FuLP{]Y+AM  
 data.uID=98;  9'\18_w  
 Shell_NotifyIcon(NIM_ADD,&data); :)cPc7$8  
 ShowWindow(SW_HIDE); wC`])z}bT  
 bTray=TRUE; -fT]}T6=  
} k[gO>UGB;  
l`~*" 4|/  
void CCaptureDlg::DeleteIcon() u z4P  
{ 6i(nyA 2!  
 NOTIFYICONDATA data; B;2os^*  
 data.cbSize=sizeof(NOTIFYICONDATA); # x!47Y{  
 data.hWnd=GetSafeHwnd(); GO+cCNMa"  
 data.uID=98; K82pWpR  
 Shell_NotifyIcon(NIM_DELETE,&data); )(_}60  
 ShowWindow(SW_SHOW); x =5k74  
 SetForegroundWindow(); V[5-A $ft  
 ShowWindow(SW_SHOWNORMAL); xWU0Ev)4U  
 bTray=FALSE; } R;.~F  
} |t!kD(~r  
t(/e~w  
void CCaptureDlg::OnChange() +I;b,p  
{ :hwZz2Dhi  
 RegisterHotkey(); ]06LNE  
} jL6u#0  
Siq2Glg_  
BOOL CCaptureDlg::RegisterHotkey() B'lWs;  
{ co|jUDu>W  
 UpdateData(); gieTkZ  
 UCHAR mask=0; ,<d[5;7x  
 UCHAR key=0; .`)\GjDv  
 if(m_bControl) .MXznz  
  mask|=4; '0p 5|[ZD  
 if(m_bAlt) py]m^)yc  
  mask|=2; 9.!6wd4mw  
 if(m_bShift) O1ofN#u  
  mask|=1; %kxq"=3  
  key=Key_Table[m_Key.GetCurSel()]; Wr a W  
 if(bRegistered){ C;1A$]bk  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); e>#*$4tg  
  bRegistered=FALSE; mawomna  
 } 2+s_*zM-  
 cMask=mask; )~rf x  
 cKey=key; |ITp$  _S  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); sbjAZzrX2i  
 return bRegistered; (vB aem9  
} q?nXhUD  
o )G'._  
  四、小结 kn^RS1m  
+%OINMo.A  
  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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