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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: {c?ymkK  
  =BW9/fG  
  一、实现方法 9TW8o}k`  
a^/K?lAB8  
  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: ]W|RtdF3.N  
K Dz]wNf  
#pragma data_seg("shareddata") %%x0w^  
HHOOK hHook =NULL; //钩子句柄 r$?Vx_f`Q  
UINT nHookCount =0; //挂接的程序数目 i"fCpkAP  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ;r=?BbND?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 QB9A-U <J  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey a'^0.1  
static int KeyCount =0; H\f/n`@,G  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 m|`VJ 0  
#pragma data_seg()  I9Om#m  
P09,P  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 hqWbp*  
nO}$ 76*'0  
  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: lG < yJ~{  
` Rsl] GB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hJ4S3b  
cKey,UCHAR cMask) r?]%d!   
{ fT x4vlI4  
 BOOL bAdded=FALSE; ] EV`dIk  
 for(int index=0;index<MAX_KEY;index++){ J2=*-O:  
  if(hCallWnd[index]==0){ /6smVz@O  
   hCallWnd[index]=hWnd; GM77Z.Y  
   HotKey[index]=cKey; Q.>/*8R;  
   HotKeyMask[index]=cMask; 5d(qtFH1  
   bAdded=TRUE; ^Bn1;  
   KeyCount++; =lm nzu<  
   break; ktWZBQY  
  } PMsC*U,oe  
 } vQcUaPm\$  
 return bAdded; :Ip~)n9t  
} K~$35c3M  
//删除热键 YVJ+' A=|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DUQ9AT#3  
{ *H?t;,\  
 BOOL bRemoved=FALSE; 0ovZ&l  
 for(int index=0;index<MAX_KEY;index++){ 67fIIXk&  
  if(hCallWnd[index]==hWnd){ 2$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0+p 5/5  
    hCallWnd[index]=NULL; CBIT`k.+  
    HotKey[index]=0; Qv\bLR  
    HotKeyMask[index]=0; :`;(p{  
    bRemoved=TRUE; ?|)rv  
    KeyCount--; gDMAc/V`l  
    break; %db3f z  
   } <qr^Nyo4  
  } Qz# 3p3N?  
 } s ?5 d  
 return bRemoved; nc- Qz  
} HmFNE$k  
l-Fmn/V  
q'by;g*m  
  DLL中的钩子函数如下: ([1=>Jw"  
V15q01bE#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) # UjEY9"M  
{ .byc;9M%  
 BOOL bProcessed=FALSE; ~U/8 @gR  
 if(HC_ACTION==nCode) va@XbUC  
 { H a90  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 TdNsyr}JG  
   switch(wParam) W.z$a.<(rF  
   {  fHLFeSfH  
    case VK_MENU: aQxe)  
     MaskBits&=~ALTBIT; 7Onk!NH  
     break; 3V"dG1?  
    case VK_CONTROL: ^z38<L=z"  
     MaskBits&=~CTRLBIT; zv`zsqDJ  
     break; CJ0$;et  
    case VK_SHIFT: ktU9LW~  
     MaskBits&=~SHIFTBIT; n}+wd9J*!2  
     break; W3"vTZJF  
    default: //judge the key and send message k"0%' Y  
     break; c 3}x)aQ  
   } cgzy0$8dj\  
   for(int index=0;index<MAX_KEY;index++){ j`{fB}  
    if(hCallWnd[index]==NULL)  )Kxs@F  
     continue; j1W bD7*8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %C6|-?TAd  
    { \f6lT3"VN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;g&7*1E  
     bProcessed=TRUE; 0 PR4g}"  
    } G,+xT}@wu  
   } -6(h@F%E  
  }  3&O% &  
  else if((lParam&0xc000ffff)==1){ //有键按下 }{P&idkv  
   switch(wParam) "$# $f  
   { :O5Tr03z  
    case VK_MENU: 3O#~dFnp  
     MaskBits|=ALTBIT; \a\^(`3a[  
     break; aeLBaS  
    case VK_CONTROL: o]dK^[/*  
     MaskBits|=CTRLBIT; \o0z@Ntq  
     break; |}l@w +N3  
    case VK_SHIFT: M0Lon/%  
     MaskBits|=SHIFTBIT; b(g_.1[  
     break; Ar\IZ_Q  
    default: //judge the key and send message YCtIeq%  
     break; `MN&(!&C*  
   } ]kyle3#-~  
   for(int index=0;index<MAX_KEY;index++){ pHq{S;R2G  
    if(hCallWnd[index]==NULL) YhEiN. ~  
     continue; Bk\*0B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Rc$=+K#  
    { "(9=h@@Y"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ['Hp?Q|k  
     bProcessed=TRUE; ?IL! X-xx  
    } Sn;/;^@(\  
   } u]ZqF *  
  } }w;Q^EU  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 B)_!F`9  
   for(int index=0;index<MAX_KEY;index++){ b>G qNf!  
    if(hCallWnd[index]==NULL) >^M!@=/?J  
     continue; mABwM$_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?FkQe~FN{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); at_dmU2[7  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 JrY"J]/  
   } XHU<4l:kl  
  } R^n* o  
 } 8#[%?}tK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~ nLkn#Z  
} T2c_vY   
.Y=Z!Q  
  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: K8e4ax  
]L5Z=.z&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); AJJ%gxqGq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g?k#wj1uH  
yt]Oj*nn0K  
  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: Fm-q=3  
sDz)_;;%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `kaR@t  
{ a!s.850@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ymzPJ??!  
 { d;@E~~o?B]  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^sr:N5~z`  
  SaveBmp(); C*Y :w  
  return FALSE; f(w#LuW<  
 } \i&vOH'  
 …… //其它处理及默认处理 f(@"[-[  
} -oaG|  
V1UUAvN7s  
9-X{x95]  
  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。 +35)=Uov  
?=pZmvQg  
  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。 .:#_5K  
C[Y%=\6'0  
  二、编程步骤 Q"l"p:n%n  
I_jM-/3b  
  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"; mmpr]cT@'k  
f4A4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; $?CBX27AV  
qr<-eJf  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; hi4h0\L!}  
;r0|_mnf  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 0|K/=dh5+  
\E ? iw.}  
  5、 添加代码,编译运行程序。 C7XS6Nqu  
(}/.4xE  
三、程序代码 R-2FNl  
aHVdClD2o  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL hPEp0("  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <IHFD^3|j  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ i+qLc6|S=2  
#if _MSC_VER > 1000 1DI"LIL  
#pragma once R9|2&pfm(M  
#endif // _MSC_VER > 1000 1OfSq1G>v$  
#ifndef __AFXWIN_H__ c:`` Y:  
#error include 'stdafx.h' before including this file for PCH FBwncG$]F*  
#endif ;?O883@r8  
#include "resource.h" // main symbols TCEXa?,L  
class CHookApp : public CWinApp !?us[f=g%  
{ oZ\qT0*eb  
 public: tehI!->l  
  CHookApp(); F'Y 2f6B  
  // Overrides FJwZo}<6E  
  // ClassWizard generated virtual function overrides mV! @oNCK  
  //{{AFX_VIRTUAL(CHookApp) ~T p8>bmSR  
 public: f>"!-3  
  virtual BOOL InitInstance(); :<WQ;q  
  virtual int ExitInstance(); I!soV0V U]  
  //}}AFX_VIRTUAL b[&,%Sm+6  
  //{{AFX_MSG(CHookApp) yjM@/b  
  // NOTE - the ClassWizard will add and remove member functions here. 08d_DCR  
  // DO NOT EDIT what you see in these blocks of generated code ! "`$'tk[  
  //}}AFX_MSG +|}K5q\  
  DECLARE_MESSAGE_MAP() #<PA- y  
}; 35N/v G0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);  7KSGG1ts  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zw%n!wc_\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #)h ~.D{  
BOOL InitHotkey(); $ <>EwW  
BOOL UnInit(); bVAgul=__  
#endif %t5BB$y  
;([tf;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 8#d1}Y  
#include "stdafx.h" vwqN;|F  
#include "hook.h" GJ^]ER-K  
#include <windowsx.h> hB GGs  
#ifdef _DEBUG h^ecn-PC  
#define new DEBUG_NEW E;GR;i{t  
#undef THIS_FILE w?$u!X  
static char THIS_FILE[] = __FILE__; @7[.> I(  
#endif VM V]TPks>  
#define MAX_KEY 100 mB|mt+  
#define CTRLBIT 0x04 >kDdWgRQ  
#define ALTBIT 0x02 5[j!\d}U  
#define SHIFTBIT 0x01 XnI ;7J  
#pragma data_seg("shareddata") "jQe\  
HHOOK hHook =NULL; "<jEI /  
UINT nHookCount =0; ;KZtW  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey fO|~Oz<S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 0@FM^ejA#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey l SVW}t  
static int KeyCount =0; @BHS5^|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Sfoy8<j  
#pragma data_seg() "aCb;2Rs  
HINSTANCE hins; CAo )v,f  
void VerifyWindow(); DP6{HR$L  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 4gkV]" H!  
//{{AFX_MSG_MAP(CHookApp) #Wc #fP  
// NOTE - the ClassWizard will add and remove mapping macros here. Wru  Fp  
// DO NOT EDIT what you see in these blocks of generated code! 3}#XA+Z  
//}}AFX_MSG_MAP b[[6X  
END_MESSAGE_MAP() ;iC'{S  
Dy{`">a  
CHookApp::CHookApp() (P>eWw\0  
{ u0 oYb_Yv  
 // TODO: add construction code here, 6nWx>R<  
 // Place all significant initialization in InitInstance :rs\ydDUF  
} /4B4IT  
N7I71q|  
CHookApp theApp; 1={Tcq\]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )Y,?r[4{  
{ {EoyMJgz  
 BOOL bProcessed=FALSE; noUZ9M|hz  
 if(HC_ACTION==nCode) cVHE}0Xd(  
 { %}ApO{  
  if((lParam&0xc0000000)==0xc0000000){// Key up YT(1 "{:  
   switch(wParam) 9X {nJ"  
   { % 6hw  
    case VK_MENU: Y7t{4P  
     MaskBits&=~ALTBIT; C}P \kDM  
     break; ?'/5%f`  
    case VK_CONTROL: T;[c<gc/  
     MaskBits&=~CTRLBIT; , w'$T)  
     break; ~h^}W$pO  
    case VK_SHIFT: ?.Yw%{?TG  
     MaskBits&=~SHIFTBIT; ;`PkmAg  
     break; PSQ:'  
    default: //judge the key and send message `)C`_g3Ew  
     break; &<P^Tvqq&  
   } v yLAs;  
   for(int index=0;index<MAX_KEY;index++){ v.2Vg  
    if(hCallWnd[index]==NULL) F/od,w9_  
     continue; ~q T1<k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yDyeP{  
    { }B '*8^S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Qhr]eu;z  
     bProcessed=TRUE; ?^$4)Y>Kf  
    } ^.1VhTB  
   } BfE-s<  
  } -J7,Nw  
  else if((lParam&0xc000ffff)==1){ //Key down "QFADk1  
   switch(wParam) :6k DUFj}  
   { q>:&xR"ra  
    case VK_MENU: rD U6 5j  
     MaskBits|=ALTBIT; )4_6\VaM  
     break; .yfqS|(  
    case VK_CONTROL: <&0*5|rR  
     MaskBits|=CTRLBIT; r=H\4%P4  
     break; 2au(8IWu  
    case VK_SHIFT: m3xj5]#^$  
     MaskBits|=SHIFTBIT; $0S"Lh{  
     break; j _9<=Vu  
    default: //judge the key and send message >.wd)  
     break; OUk5c$M(  
   } IZv, Wo  
   for(int index=0;index<MAX_KEY;index++) 5F sj_wFk  
   { yqb <<4I  
    if(hCallWnd[index]==NULL) 2d;xAX]  
     continue; "X(=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !@Vp Bl  
    { -zLI!F 0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ZFuJ2 :  
     bProcessed=TRUE; @$yYljP  
    } |wb(rua  
   } ?| LB:8  
  } hGo|2@sc  
  if(!bProcessed){ 8U:dgXz  
   for(int index=0;index<MAX_KEY;index++){ EbYH?hPo  
    if(hCallWnd[index]==NULL) UG'U D"  
     continue; /N{@g.edL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  <IDzv'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n9/0W%X>  
   } HWfX>Vf>}k  
  } =egi?Ne  
 } u&_U CJCf  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @OY-(cW  
} 0\ w[_H  
10 H!  
BOOL InitHotkey() k Q(y^tW  
{ _%TeTNY#  
 if(hHook!=NULL){ EEZ2Gu6c  
  nHookCount++; w:zC/5x`  
  return TRUE; / lM~K:  
 } (<JDD]J  
 else :Fd9N).%  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); h}&IlDG  
  if(hHook!=NULL) 3X,{9+(F  
   nHookCount++; `h3}"js  
  return (hHook!=NULL); <a[8;YQC  
} XK-x*|  
BOOL UnInit() ,wo"(E!4e  
{ hsO.521g  
 if(nHookCount>1){ d@f2Vxe7  
  nHookCount--; vGHYB1=~  
  return TRUE; T>%ny\?tHW  
 } JsEEAM:w  
 BOOL unhooked = UnhookWindowsHookEx(hHook); T`ZJ=gv  
 if(unhooked==TRUE){ W8h\ s {  
  nHookCount=0; SfL`JNi)  
  hHook=NULL; TC{Qu;`H+U  
 } g2<S4  
 return unhooked; 3(*s|V"  
} .%Q Ea_\  
,4W((OQ^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $[CA#AXE  
{ 5@%-=87S  
 BOOL bAdded=FALSE; y+afUJT  
 for(int index=0;index<MAX_KEY;index++){ /(pChY>  
  if(hCallWnd[index]==0){ }/0dfes  
   hCallWnd[index]=hWnd; yZ0ZP  
   HotKey[index]=cKey; ~RAH -]  
   HotKeyMask[index]=cMask; :=eUNH  
   bAdded=TRUE; X hX'*{3k  
   KeyCount++; k K|+W,  
   break; !*UdY(  
  } yP4.Z9  
 } \U>Kn_7m  
 return bAdded; E"&9FxS]^  
} jUSr t)o03  
>! .9g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =T}uQ$X  
{ J4#]8!A  
 BOOL bRemoved=FALSE; xumv I{  
 for(int index=0;index<MAX_KEY;index++){  " 1Aus  
  if(hCallWnd[index]==hWnd){ 8mLU ~P |  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4PM`hc  
    hCallWnd[index]=NULL; iZ\z!tHR  
    HotKey[index]=0; -JK4-Hg  
    HotKeyMask[index]=0; d( g_y m*  
    bRemoved=TRUE; r!,V_a4n  
    KeyCount--; 1u+ (rVQN  
    break; tgA |Vwwk  
   } 7!nAWlQ&-E  
  } gjLgeyyWC  
 } XO~^*[K  
 return bRemoved; ++"PPbOe&D  
} K({,]<l5  
$Xc<K_Z  
void VerifyWindow() ITlkw~'G  
{ YH9] T,  
 for(int i=0;i<MAX_KEY;i++){ }8#Czo jt  
  if(hCallWnd!=NULL){ w/6@R 4)p  
   if(!IsWindow(hCallWnd)){ hAyPaS#  
    hCallWnd=NULL; lIP<`6=4  
    HotKey=0; IuW10}"9  
    HotKeyMask=0; (SA*9%  
    KeyCount--; L]<4{8H.  
   } TJ:Lz]l >  
  } UdJV;T'rm  
 } |h/2'zd^-  
} ,0~TvJS  
SH|$Dg  
BOOL CHookApp::InitInstance() /z:K#  
{ kq0m^`  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); %WN2 xCSf  
 hins=AfxGetInstanceHandle(); c%.& F  
 InitHotkey(); nB0 ol-<  
 return CWinApp::InitInstance(); 'Sh5W%NM  
} We?:DM [  
1tpD|  
int CHookApp::ExitInstance() [Cp{i<C  
{ y8z%s/gRh  
 VerifyWindow(); &}1)]6q$  
 UnInit(); ,$-PC=Ti(  
 return CWinApp::ExitInstance(); L9oZ7o  
} G)7sXEe  
EPy/6-5b  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hGV/P94  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Q#KjX;No  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4/>={4Y9  
#if _MSC_VER > 1000 lej{VcG  
#pragma once 0{F.DDiNT  
#endif // _MSC_VER > 1000 glgk>83I+  
sc60:IxgI  
class CCaptureDlg : public CDialog Y\sjm]_  
{ CV"Y40  
 // Construction HXI}f\6x  
 public: E:k?*l  
  BOOL bTray; 6~>k]G  
  BOOL bRegistered; yk{alSF  
  BOOL RegisterHotkey(); C<>.*wlp=  
  UCHAR cKey; `f]O  
  UCHAR cMask; CI{x/ e^(  
  void DeleteIcon(); %A3Jd4DH  
  void AddIcon(); 9#!tzDOtD  
  UINT nCount; nT"z(\i.!J  
  void SaveBmp(); {+Yo&F}n  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Dy!fwYPA/{  
  // Dialog Data ,RQ-w2j?  
  //{{AFX_DATA(CCaptureDlg) &)-?=M  
  enum { IDD = IDD_CAPTURE_DIALOG }; H #_Z6J  
  CComboBox m_Key; 7l3q~dQ  
  BOOL m_bControl; q =6 Y2Q  
  BOOL m_bAlt; 7i.aZ2a%  
  BOOL m_bShift; sSUd;BYf  
  CString m_Path; (.o'1 '  
  CString m_Number; W(YJz#]6_  
  //}}AFX_DATA "#jKk6{I0  
  // ClassWizard generated virtual function overrides N=9lA0y+  
  //{{AFX_VIRTUAL(CCaptureDlg) Cq~Ir*"  
 public: 6bba}P  
  virtual BOOL PreTranslateMessage(MSG* pMsg); LKcrr;  
 protected: @HI5; z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GWKefH  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); v<1;1m  
  //}}AFX_VIRTUAL NO ^(D+9  
  // Implementation QUf_fe!,|  
 protected: gp=0;#4 4  
  HICON m_hIcon; o1\8>Ew  
  // Generated message map functions &bQ^J%\  
  //{{AFX_MSG(CCaptureDlg) 9"S3AEI  
  virtual BOOL OnInitDialog(); '! (`?  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); k W,|>  
  afx_msg void OnPaint(); v0=~PN~E  
  afx_msg HCURSOR OnQueryDragIcon(); hM}2++V  
  virtual void OnCancel(); z/b*]"g,  
  afx_msg void OnAbout(); rNc>1}DDS  
  afx_msg void OnBrowse(); G<'S  
  afx_msg void OnChange(); JK4  @  
 //}}AFX_MSG zYgLGwi{  
 DECLARE_MESSAGE_MAP() GcuZPIN%D  
}; >nX'RE|F  
#endif .+yJ'*i$d  
<FE O6YP  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 71_N9ub@z  
#include "stdafx.h" q9Q4F  
#include "Capture.h" Q"O _h  
#include "CaptureDlg.h" A\`Uu&  
#include <windowsx.h> G1rgp>m  
#pragma comment(lib,"hook.lib") dkjL;1  
#ifdef _DEBUG B_> Fd&  
#define new DEBUG_NEW }R^{<{KVJ  
#undef THIS_FILE {`VQL6(i  
static char THIS_FILE[] = __FILE__; h.nzkp5  
#endif !?{5ET,gtN  
#define IDM_SHELL WM_USER+1 N *fN&0r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?=/l@d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); VMp6s%m  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; DcS~@ ;  
class CAboutDlg : public CDialog 6%TV X  
{ ''G @n*  
 public: ^s5)FdF8  
  CAboutDlg(); 2;/hFwm  
  // Dialog Data 4y 'REC  
  //{{AFX_DATA(CAboutDlg) ":OXs9Yg  
  enum { IDD = IDD_ABOUTBOX }; 5zU$_M  
  //}}AFX_DATA 9V~yK?  
  // ClassWizard generated virtual function overrides -UO$$)Q  
  //{{AFX_VIRTUAL(CAboutDlg) o&=m]hKpQl  
 protected: 6o!"$IH4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^IpS 3y  
  //}}AFX_VIRTUAL Ne%X:h  
  // Implementation WVZ\4y  
 protected: n):VuOjm  
  //{{AFX_MSG(CAboutDlg) Ap/WgVw;  
  //}}AFX_MSG D+OkD-8q  
  DECLARE_MESSAGE_MAP() FwyPmtBj  
}; ]l`DR4 =  
2bqwnRT}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) VrpY BU  
{ BtspnVB ez  
 //{{AFX_DATA_INIT(CAboutDlg) 3iB8QO;pp  
 //}}AFX_DATA_INIT Nbr{)h  
} `g7' )MSy  
q07>FW R  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;RXv%ML  
{ ]Sh&8 #  
 CDialog::DoDataExchange(pDX); ][3 "xP  
 //{{AFX_DATA_MAP(CAboutDlg) ctf'/IZ5  
 //}}AFX_DATA_MAP - 0zo>[c/p  
} SLW1]ZaG  
F)C8LH  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) gN*8 zui  
 //{{AFX_MSG_MAP(CAboutDlg) g& {YHq^+  
 // No message handlers {z w#My   
 //}}AFX_MSG_MAP gCmGFQE-f  
END_MESSAGE_MAP() Y#\e~>K  
bbz86]AhY  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) OnG?@sW+4!  
: CDialog(CCaptureDlg::IDD, pParent) LTxOq|/Cq  
{ d97wiE/i<  
 //{{AFX_DATA_INIT(CCaptureDlg) *fE5Z;!}  
  m_bControl = FALSE; *{uu_O  
  m_bAlt = FALSE; S5j#&i  
  m_bShift = FALSE; + EM '-  
  m_Path = _T("c:\\"); 7Ev~yY;N  
  m_Number = _T("0 picture captured."); d%WFgf}  
  nCount=0; Q9( eH2=  
  bRegistered=FALSE; m#uutomi0  
  bTray=FALSE; BJqM=<nQ  
 //}}AFX_DATA_INIT hSxf;>(d  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 p0Vw@R=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); o;t{YfK  
} [=Xvp z  
t ,0~5>5  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) g%K3ah v  
{ JWLQ9U X  
 CDialog::DoDataExchange(pDX); ;(z0r_p<q  
 //{{AFX_DATA_MAP(CCaptureDlg) uJi|@{V  
  DDX_Control(pDX, IDC_KEY, m_Key); fNQecDuS  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {L#Pdj{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); h>4\I;Ij  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); XWkYhTaY  
  DDX_Text(pDX, IDC_PATH, m_Path); HR4^+x  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (u *-(  
 //}}AFX_DATA_MAP $#CkI09  
} VQ +Xh  
IyMKV$"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !y6 D+<k*]  
//{{AFX_MSG_MAP(CCaptureDlg) Rt+s\MC^r  
 ON_WM_SYSCOMMAND() <=WQs2  
 ON_WM_PAINT() )AnX[:y  
 ON_WM_QUERYDRAGICON() F*QGzbv)  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) zH.7!jeE  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0 j6/H?OT  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^X^4R1V)  
//}}AFX_MSG_MAP X[R/j*K  
END_MESSAGE_MAP() U`xjau+  
>XB Lm`a  
BOOL CCaptureDlg::OnInitDialog() $cjidBi`):  
{ zI&oZH^vn  
 CDialog::OnInitDialog(); U\+o$mU^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9mr99 tA  
 ASSERT(IDM_ABOUTBOX < 0xF000); }=NjFK_6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); lV3\5AEW  
 if (pSysMenu != NULL) XJ.vj+XXb  
 { <Dl7|M  
  CString strAboutMenu; nT:ZSJWM  
  strAboutMenu.LoadString(IDS_ABOUTBOX); O0e6I&u :  
  if (!strAboutMenu.IsEmpty()) SwLul4V  
  { h&&ufF]D  
   pSysMenu->AppendMenu(MF_SEPARATOR); TwY]c<t  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); O.}{s;  
  } d&F8nBIM5  
 } ~i(X{ ^,3  
 SetIcon(m_hIcon, TRUE); // Set big icon ~qs 97'  
 SetIcon(m_hIcon, FALSE); // Set small icon 4\>Cnc{  
 m_Key.SetCurSel(0); O",:0<  
 RegisterHotkey(); 3#W>  
 CMenu* pMenu=GetSystemMenu(FALSE); 2-FL&DE  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); VGkwrS;+I  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); t=5 K#SX}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7&E3d P  
 return TRUE; // return TRUE unless you set the focus to a control %6L{Z*(  
} ,'[0tl}8K  
>A#]60w.  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @jX[Ho0W'  
{ .#@*)1A#t  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) bP(xMw<'j  
 { }Dm-Ibdg(  
  CAboutDlg dlgAbout; aH*)W'N?  
  dlgAbout.DoModal(); 6Wl+5 a6V  
 } PE0A`  
 else (]1n!  
 {  LGV"WE  
  CDialog::OnSysCommand(nID, lParam); VD,g  
 } n)gzHch  
} ) m[0,  
$)mK]57  
void CCaptureDlg::OnPaint() ]7eQ5[ 5s  
{ 5?{a=r9  
 if (IsIconic()) 2/3,%5j_  
 { uL`;KD  
  CPaintDC dc(this); // device context for painting b|P[\9  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); hvkLcpE  
  // Center icon in client rectangle @h$cHZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); %N04k8z  
  int cyIcon = GetSystemMetrics(SM_CYICON); QOB>Tv E  
  CRect rect; h@&& .S`B  
  GetClientRect(&rect); ^fa+3`>  
  int x = (rect.Width() - cxIcon + 1) / 2; 7E 6gXf.  
  int y = (rect.Height() - cyIcon + 1) / 2; x=(Q$Hl5  
  // Draw the icon 'gI q_t|^  
  dc.DrawIcon(x, y, m_hIcon); oSq4g{xvMH  
 } J4&d6[40  
 else sA[hG*#/S  
 { *F[@lY\p  
  CDialog::OnPaint();  R5(<:]  
 } !`JaYUL[e  
} m r&nB  
[> Q+=(l  
HCURSOR CCaptureDlg::OnQueryDragIcon() u1R_u9  
{ cxn3e,d`  
 return (HCURSOR) m_hIcon; Q/xT>cUd  
} /_rEI,[k  
]c4?-Vq%u  
void CCaptureDlg::OnCancel() Dk[m)]w\  
{ 3 - Nwg9 U  
 if(bTray) Gm~jC <  
  DeleteIcon(); ErnjIx:  
  CDialog::OnCancel(); ;EDc1:  
} ~.;+uH<i  
YMb\v4  
void CCaptureDlg::OnAbout() >)\x\e  
{ 5)bf$?d   
 CAboutDlg dlg; *mwHuGbZed  
 dlg.DoModal(); d e)7_pCF|  
} K Rs e  
4>x]v!d  
void CCaptureDlg::OnBrowse() Sc#B -4m  
{ kK\G+{z?  
 CString str; N8S !&*m  
 BROWSEINFO bi; 9.)*z-f$  
 char name[MAX_PATH]; Z]OXitt7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Z<jio  
 bi.hwndOwner=GetSafeHwnd(); QhR.8iS  
 bi.pszDisplayName=name; I6@98w}"  
 bi.lpszTitle="Select folder"; ;;;aM:6\  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; IYAvO%~  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); lV924mh  
 if(idl==NULL) |, #DB  
  return; _kGJqyYV  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }ya@*jH  
 str.ReleaseBuffer(); 5G  @  
 m_Path=str; $De14  
 if(str.GetAt(str.GetLength()-1)!='\\') P&I%!'<   
  m_Path+="\\"; A@M%}h  
 UpdateData(FALSE); 4j+FDc`  
} ])Rs.Y{Q5  
VAPRI\uM;  
void CCaptureDlg::SaveBmp() `TwDR6&  
{ YD>5zV%!D  
 CDC dc; 3h N?l :/b  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); b/;!yOF  
 CBitmap bm; :buH\LB*P  
 int Width=GetSystemMetrics(SM_CXSCREEN); 17kh6(X  
 int Height=GetSystemMetrics(SM_CYSCREEN); qTxw5.Ai!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); cC@.&  
 CDC tdc; D#"BY; J  
 tdc.CreateCompatibleDC(&dc); YNHQbsZUI,  
 CBitmap*pOld=tdc.SelectObject(&bm); dZ^(e0& :H  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _7e ^ t N  
 tdc.SelectObject(pOld); ye?4^@u u  
 BITMAP btm; S\wh *'Y  
 bm.GetBitmap(&btm); ygI81\ D  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; rFn%e  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Z8mSm[w  
 BITMAPINFOHEADER bih; DNTkv_S  
 bih.biBitCount=btm.bmBitsPixel; pAK7V;sJ  
 bih.biClrImportant=0; *S _[8L"  
 bih.biClrUsed=0; 9rD6."G  
 bih.biCompression=0; 3X|7 R  
 bih.biHeight=btm.bmHeight; j:k}6]p}  
 bih.biPlanes=1; 5~8FZ-x  
 bih.biSize=sizeof(BITMAPINFOHEADER); <=O/_Iu(  
 bih.biSizeImage=size; sVzU>  
 bih.biWidth=btm.bmWidth; MX*T.TG8  
 bih.biXPelsPerMeter=0; NWL\"xp `t  
 bih.biYPelsPerMeter=0; 4 H 4W  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "!w$7|% T  
 static int filecount=0; R{6~7<m.  
 CString name; Ei$?]~ &  
 name.Format("pict%04d.bmp",filecount++); $4YyZ!_.@  
 name=m_Path+name; _T\/kJ)Q\  
 BITMAPFILEHEADER bfh; `3wzOMgJ  
 bfh.bfReserved1=bfh.bfReserved2=0; t?&@bs5~g  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ?so=k&I-M  
 bfh.bfSize=54+size; l  rRRRR  
 bfh.bfOffBits=54; g<b(q|  
 CFile bf; [-Xz:  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _Fc :<Ym?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =@ SJyW  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8)KA {gN}  
  bf.WriteHuge(lpData,size); mHj3ItXUu  
  bf.Close(); 6 (M^`&fl  
  nCount++; ;7/ ;4Z  
 } Wnf3[fV6P  
 GlobalFreePtr(lpData); gC/~@Z8W]  
 if(nCount==1) S2APqRg*  
  m_Number.Format("%d picture captured.",nCount); [nYm-\M  
 else fS@V`"O6  
  m_Number.Format("%d pictures captured.",nCount); owR`Z`^h)  
  UpdateData(FALSE); Uj/m  
} #saK8; tp  
='rSB.$Ctk  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 7A,QA5G ]C  
{ n8K FP  
 if(pMsg -> message == WM_KEYDOWN) S`w_q=-^8  
 { cu |S|]g  
  if(pMsg -> wParam == VK_ESCAPE) YZ0y_it)  
   return TRUE; !Py SYY  
  if(pMsg -> wParam == VK_RETURN) LvM;ZfAEv  
   return TRUE; 0aWy!d  
 } 3)ZdT{ MY  
 return CDialog::PreTranslateMessage(pMsg); = n>aJ(=Pd  
} {.r jp`39  
[c`u   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t%k1=Ow5i  
{ ?^X e^1(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,)svSzR  
  SaveBmp(); ]QqT.z%B  
  return FALSE; __mnz``/Y  
} .sqX>sU/]  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7>@g)%",  
 CMenu pop; :6T 8\W  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); L!>EW0  
 CMenu*pMenu=pop.GetSubMenu(0); HxE`"/~.7k  
 pMenu->SetDefaultItem(ID_EXITICON); i!nPiac  
 CPoint pt; Le?yzf  
 GetCursorPos(&pt); +t8{aaV  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); pBR9)T\ n  
 if(id==ID_EXITICON) dv7IHUFf  
  DeleteIcon(); l<DpcLX  
 else if(id==ID_EXIT) ?7eD< |  
  OnCancel(); ;)c 4  
 return FALSE; L_~vPp  
} ' K\ $B_  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); d*cAm$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) .[Hv/?L  
 AddIcon(); H)@f_pfj(  
 return res; qX_( M2oLU  
} $D%[}[2  
,suC`)R  
void CCaptureDlg::AddIcon() #P,C9OQD  
{ +`(,1L1  
 NOTIFYICONDATA data; $qp,7RW  
 data.cbSize=sizeof(NOTIFYICONDATA); _v\L'`bif  
 CString tip; `A0trC3  
 tip.LoadString(IDS_ICONTIP); HLruZyN4  
 data.hIcon=GetIcon(0); 9)~Ha iVB  
 data.hWnd=GetSafeHwnd(); aP`[O]8j  
 strcpy(data.szTip,tip); 5 0KB:1(g  
 data.uCallbackMessage=IDM_SHELL; OS{j5o  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &pk&8_=f  
 data.uID=98; -~HyzX\cZB  
 Shell_NotifyIcon(NIM_ADD,&data); bMjE@S&  
 ShowWindow(SW_HIDE); ajJ+Jn\  
 bTray=TRUE; 5h!ZoB)n  
} WF&?OHf2  
wJ}9(>id*  
void CCaptureDlg::DeleteIcon() ^{l^Z +b.  
{ p]^?4  
 NOTIFYICONDATA data; ]!mC5Ea  
 data.cbSize=sizeof(NOTIFYICONDATA); +<TnE+>j  
 data.hWnd=GetSafeHwnd(); cy%S5Rz  
 data.uID=98; i,R+C.6{  
 Shell_NotifyIcon(NIM_DELETE,&data); F,)\\$=,  
 ShowWindow(SW_SHOW); U%qE=u-  
 SetForegroundWindow(); 3B^`xnV  
 ShowWindow(SW_SHOWNORMAL); kCVO!@yZz  
 bTray=FALSE; ^DaP^<V  
} I<}<!.Bc!  
?E2$  
void CCaptureDlg::OnChange() F?jFFw im  
{ QVq+';cG  
 RegisterHotkey(); /t $J<bU  
} ch-.+p3  
qVe&nXo  
BOOL CCaptureDlg::RegisterHotkey() MEled:i  
{ o 00(\ -eb  
 UpdateData(); R>CIEL  
 UCHAR mask=0; 84|oqwZO  
 UCHAR key=0; 3mCf>qj73  
 if(m_bControl) VKtZyhK"h  
  mask|=4; '0MH-M  
 if(m_bAlt) WKDa]({k%  
  mask|=2; ,T<q"d7-#  
 if(m_bShift) #ts;s\!  
  mask|=1; )^q7s&p/  
  key=Key_Table[m_Key.GetCurSel()]; _ !r]**  
 if(bRegistered){ GyP.;$NHa[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =,HxtPJ  
  bRegistered=FALSE; mDB?;a>  
 } :Y\!~J3W  
 cMask=mask; J =j6rD  
 cKey=key; !$1'q~sO  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?ZS/`P0}[  
 return bRegistered; ]Lz:oV^%  
} 6.(L8.jv  
)B1gX>J\8  
  四、小结 %+F%C=GqI  
Yfa`}hQ  
  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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