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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: UpCkB}OhR1  
  Ln&CB!u  
  一、实现方法 a #Pr)H  
Z^ }4bR]  
  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: x_.}C%  
@y{ f>nm  
#pragma data_seg("shareddata") ue"e><c6:  
HHOOK hHook =NULL; //钩子句柄 :N ]H"u9X  
UINT nHookCount =0; //挂接的程序数目 Hrj@I?4  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 [HSN*LXe  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _XUDPC(*qz  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey zc%HBZ3p  
static int KeyCount =0; BZAF;j  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -)Y[t Z^*`  
#pragma data_seg() m$bDWxm#e  
&=hkB9 ;  
  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。 C'xWRSDO  
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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: ]m"6a-,`  
XT~]pOE;D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5WU ? Km  
cKey,UCHAR cMask) f&L8<AS Fo  
{ qBXIR }  
 BOOL bAdded=FALSE; ,S\AUUt%  
 for(int index=0;index<MAX_KEY;index++){ DyPb]Udb:  
  if(hCallWnd[index]==0){ {^*D5  
   hCallWnd[index]=hWnd; Q804_F F#  
   HotKey[index]=cKey; xzOM\Nq?O  
   HotKeyMask[index]=cMask; 8PwPI%Pb  
   bAdded=TRUE; B5 H=#  
   KeyCount++; ~ U`|+ 5  
   break; 8c0ugM  
  } <;':'sW  
 } V( SRw  
 return bAdded;  o C#W  
} B*T;DE   
//删除热键 eCXw8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $SPA'63AC  
{ X UcM~U-  
 BOOL bRemoved=FALSE; w]=c^@t _  
 for(int index=0;index<MAX_KEY;index++){ =y WHm  
  if(hCallWnd[index]==hWnd){ vN3uLz'<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8$y5) ~Q  
    hCallWnd[index]=NULL; V"R,omh  
    HotKey[index]=0; R?H[{A X  
    HotKeyMask[index]=0; cy!;;bB  
    bRemoved=TRUE; t6a$ZN;  
    KeyCount--; `} :~,E  
    break; O t1:z:Pl  
   } (=/}i'  
  } vD p|9VY?  
 } MgUjB~)Y  
 return bRemoved; #>\%7b59>  
} 1QJB4|5R#  
9Jj:d)E>o  
cSWn4-B@l  
  DLL中的钩子函数如下: +EE(d/ f  
_omz74   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?-D'xqc  
{ ;iT ZzmB  
 BOOL bProcessed=FALSE; fMZzR|_18  
 if(HC_ACTION==nCode) eL{6;.C  
 { kl i)6R<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 dId&tTMmC  
   switch(wParam) ;LE9w^>^V  
   {  4+'d">+|  
    case VK_MENU: tB==v{t  
     MaskBits&=~ALTBIT; wTkcR^  
     break; >^ijj`{d  
    case VK_CONTROL: qjI.Sr70  
     MaskBits&=~CTRLBIT; 7o4B1YD  
     break; FCA]zR1  
    case VK_SHIFT: ?QG?F9?  
     MaskBits&=~SHIFTBIT; *#g[ jl4  
     break; c&;Xjy  
    default: //judge the key and send message N@G~+GCxL  
     break; \+Pk"M  
   } /j:fc?yv  
   for(int index=0;index<MAX_KEY;index++){ gO,2:,  
    if(hCallWnd[index]==NULL) lz88//@gZ  
     continue; * J|]E(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J'#R9NO<  
    { bo04y)Iz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .:V4>  
     bProcessed=TRUE; do&0m[x%  
    } c3q @]|aI  
   } X w_6SR9C  
  } v!77dj 6I  
  else if((lParam&0xc000ffff)==1){ //有键按下 nHTb~t5Ke  
   switch(wParam) >P[BwL]  
   { <Pg<F[eDM  
    case VK_MENU: =?s0.(;  
     MaskBits|=ALTBIT; 6*tbil_G+  
     break; tX7TP(  
    case VK_CONTROL: $mLiEsJ  
     MaskBits|=CTRLBIT; WuUT>om H  
     break; C3GI?| b  
    case VK_SHIFT:  3JcI}w  
     MaskBits|=SHIFTBIT; ?Y | *EH  
     break; !p$k<?WXc  
    default: //judge the key and send message VaLl$w  
     break; <Z^qBM  
   } SlojB^%  
   for(int index=0;index<MAX_KEY;index++){ 7R5!(g  
    if(hCallWnd[index]==NULL) kV:C=MLI  
     continue; |?Bb{Es  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C8bv%9  
    { to"[r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n,.t~  
     bProcessed=TRUE; \r7gubD  
    } EaXD Y<  
   } 6> Ca O  
  } KM jnY2  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 bk{.9nz2  
   for(int index=0;index<MAX_KEY;index++){ %2t#>}If!  
    if(hCallWnd[index]==NULL) K}1eQS&$a  
     continue; F\( 7B#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *, RxOz2=  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); l<YCX[%E  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 #RWHk  
   } -y5Z c?e  
  } Zk#?.z}  
 } Th(F^W9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [*|QA 9  
} [5O`  
ps=+wg?]  
  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: %zA$+eT  
&6}] v:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h`HdM58CQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E+|r h-M7  
%*`yd.L0W  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:  }j /r  
jtF et{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *2tG07kI  
{ m"RE[dQ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Y^P'slY{%  
 { Wy.Xx-3W  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^vH3 -A;*  
  SaveBmp(); #m<<]L(o8W  
  return FALSE; 8NS1*\z  
 } ^S'tMT_  
 …… //其它处理及默认处理 6 SosVE>Z  
} zu-1|X X  
Rf .b_Y@O  
Jxy94y*  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 G B &+EZ  
<DjFMTCN  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 d3|oKP6  
>HH49 cCo  
  二、编程步骤 Q4JvFy0'  
rtM!|apr  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; {Z=m5Dy}  
Qy+&N*k>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 6Wabw:  
Sn lKPd  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; A+Xk=k5<  
k)a-odNrb  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; +Eh^j3W  
\dz@hJl:  
  5、 添加代码,编译运行程序。 VY9|8g/  
i@C$O.m(  
三、程序代码 79svlq=  
01nbR+e  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL bf3Njma%  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 02~+$R]L  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ S^Z[w|1  
#if _MSC_VER > 1000 Vp'Zm:  
#pragma once 9w=GB?/  
#endif // _MSC_VER > 1000 ?T(>!m  
#ifndef __AFXWIN_H__ URodvyD  
#error include 'stdafx.h' before including this file for PCH PmGW\E[ni  
#endif H -sJt:  
#include "resource.h" // main symbols Q6G-`&5  
class CHookApp : public CWinApp wf<=r W'  
{ O,kzU,zOs  
 public: exqFwmhh  
  CHookApp(); L.uX  
  // Overrides 'xUyGj:  
  // ClassWizard generated virtual function overrides SJtQK-%wK>  
  //{{AFX_VIRTUAL(CHookApp) \P;%fN  
 public: >_Dq)n;%  
  virtual BOOL InitInstance(); {/C \GxH+  
  virtual int ExitInstance(); R N1q/H|  
  //}}AFX_VIRTUAL V #0F2GV<,  
  //{{AFX_MSG(CHookApp) GN4'LU  
  // NOTE - the ClassWizard will add and remove member functions here. &;%z1b> F  
  // DO NOT EDIT what you see in these blocks of generated code ! ER O'{nT&  
  //}}AFX_MSG 1 XAXokxj  
  DECLARE_MESSAGE_MAP() cViEvS r  
}; =7JvS~s  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); |=^p`CT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +P?!yH,n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P,x'1 `k~  
BOOL InitHotkey(); ?v-( :OF  
BOOL UnInit(); ;/ iBP2  
#endif ,m-z D  
hE41$9?TJ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,&$+ {3  
#include "stdafx.h" BULf@8~(  
#include "hook.h" L7*,v5  
#include <windowsx.h> v`"z  
#ifdef _DEBUG 8,Jjv*  
#define new DEBUG_NEW qn VxP&  
#undef THIS_FILE o~#cpU4{o  
static char THIS_FILE[] = __FILE__; `.dX@<  
#endif P8N`t&r"7  
#define MAX_KEY 100 TBN0uk  
#define CTRLBIT 0x04 |g vx^)ro  
#define ALTBIT 0x02 RKu'WD?sdH  
#define SHIFTBIT 0x01 G x;U 3iV  
#pragma data_seg("shareddata") jN\} l|;q  
HHOOK hHook =NULL; ~C1lbn b  
UINT nHookCount =0; PuvC MD  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^ lrq`1k  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT poZ04Uxo>  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey WoVPp*zlX  
static int KeyCount =0; eI8rnp( Ia  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift uD=i-IHT  
#pragma data_seg() _g|zDi^  
HINSTANCE hins; ]Ek6EuaK  
void VerifyWindow(); h0}= C_.^  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g.wp }fz  
//{{AFX_MSG_MAP(CHookApp) O)y|G%O  
// NOTE - the ClassWizard will add and remove mapping macros here. #k %$A}9  
// DO NOT EDIT what you see in these blocks of generated code! D00I!D16  
//}}AFX_MSG_MAP !~+"TI}_%w  
END_MESSAGE_MAP() B$R"Ntp  
BI\ )vr$  
CHookApp::CHookApp() y0!-].5UH  
{ $#3O:aW  
 // TODO: add construction code here, C-i9F%..  
 // Place all significant initialization in InitInstance 0E*q-$P  
} )Gf"#TM[  
[D !-~]5  
CHookApp theApp; 0(!j]w"r3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) h^yLmRL  
{  !t.  
 BOOL bProcessed=FALSE; z+ch-L^K4  
 if(HC_ACTION==nCode) LA!2!60R  
 { ;DQ{6(  
  if((lParam&0xc0000000)==0xc0000000){// Key up `/ W6, ]  
   switch(wParam) 0GEM3~~D.?  
   { Q"o* \I  
    case VK_MENU: !*[Fw1-J  
     MaskBits&=~ALTBIT; <SK%W=  
     break; tM&O<6Y  
    case VK_CONTROL: q1rBSlzN  
     MaskBits&=~CTRLBIT; /y8=r"'G  
     break; 9|kc$+(+6  
    case VK_SHIFT: !V<c:6"  
     MaskBits&=~SHIFTBIT; \<cs:C\h7  
     break; 0\qLuF[)  
    default: //judge the key and send message /INjP~C  
     break; OV@MT^  
   } MHl ffj  
   for(int index=0;index<MAX_KEY;index++){ 1!(Og~#(  
    if(hCallWnd[index]==NULL) |6]2XW  
     continue; %y7&~me  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) OoW,mmthj>  
    { (d9G`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g0Rny  
     bProcessed=TRUE; ld*W\  
    } Ge'[AhA  
   } sBN"eHg  
  } @u@ N&{b5"  
  else if((lParam&0xc000ffff)==1){ //Key down LS"_-4I}  
   switch(wParam) o|Q:am'H  
   { prIPPeMdz  
    case VK_MENU: 35q4](o9"  
     MaskBits|=ALTBIT; U?@ s`.  
     break; fGZZ['E  
    case VK_CONTROL: 71S~*"O0f  
     MaskBits|=CTRLBIT; ^bD)Tg5K  
     break; ~__r- z  
    case VK_SHIFT: hSl6 X3W  
     MaskBits|=SHIFTBIT; 2F}D?] A  
     break; VVd9VGvh  
    default: //judge the key and send message OON]E3yy  
     break; 0A,u!"4[  
   } 8;%F-?  
   for(int index=0;index<MAX_KEY;index++) QPD[uJ(I  
   { `>HM<Nn-0  
    if(hCallWnd[index]==NULL) ;hf{B7  
     continue; /JqNiqvh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *#n#J[  
    { bjL8Wpk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vtByCu5  
     bProcessed=TRUE; MvCB|N"qy  
    } ;bYpMcH  
   } /h]#}y j  
  }  ~ERA  
  if(!bProcessed){ b41f7t=  
   for(int index=0;index<MAX_KEY;index++){ &UFj U%Z%  
    if(hCallWnd[index]==NULL) GJr1[  
     continue; -X]?ql*%`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +A;AX.mr  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kB! iEoIBA  
   } >;sz(F3)  
  } hifC.guK  
 } 'NAC4to;;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); J< vVsz+7:  
} zObrp  
af>^<q  
BOOL InitHotkey() -"CXBKHb  
{ n40&4n  
 if(hHook!=NULL){ it.'.aK4  
  nHookCount++; W2w A66MB  
  return TRUE; ;irAq|  
 } d#U~>wr  
 else #xoFcjRE  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Zl\$9Q_  
  if(hHook!=NULL) k .#I ;7  
   nHookCount++; 9Qb6ek  
  return (hHook!=NULL); )*`cJ_t  
} %7v!aJ40  
BOOL UnInit() )JXlPU  
{ 7L4~yazmK  
 if(nHookCount>1){ >(\Z-I&YQ  
  nHookCount--; L!LhH  
  return TRUE; VBN=xg}  
 } eJy}W /  
 BOOL unhooked = UnhookWindowsHookEx(hHook); DX(!G a  
 if(unhooked==TRUE){ BCI[jfd7  
  nHookCount=0; cna/?V  
  hHook=NULL; 6 =H]p1p~O  
 } nrM_ay  
 return unhooked; 2uzy]faM  
} >9+h2B  
d "%6S*dL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q35D7wo'}  
{ 9YvK<i&I  
 BOOL bAdded=FALSE; z5 g4+y,  
 for(int index=0;index<MAX_KEY;index++){ O"ebrv  
  if(hCallWnd[index]==0){ .L8g( F(=:  
   hCallWnd[index]=hWnd; S7h?tR*u  
   HotKey[index]=cKey; >*h3u7t  
   HotKeyMask[index]=cMask; m:)s UC0  
   bAdded=TRUE; .H}#,pQ}l  
   KeyCount++; giH WC%/  
   break; !-~sxa280r  
  } y1bo28  
 } NRMEZ\*L  
 return bAdded; sEHA?UP$<F  
} Zo#c[9IaC  
zI$'D|A  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oR~s \Gt  
{ 6^sH3=#  
 BOOL bRemoved=FALSE; &l~9FE *  
 for(int index=0;index<MAX_KEY;index++){ 7qL B9r  
  if(hCallWnd[index]==hWnd){ $Ned1@%[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ sf Zb$T J  
    hCallWnd[index]=NULL; M&}_3  
    HotKey[index]=0; oIGF=x,e8  
    HotKeyMask[index]=0; CE7{>pl  
    bRemoved=TRUE; @;7Ht Z`  
    KeyCount--; 8<=]4-X@  
    break; =\IUBH+C  
   } $ qTv2)W1{  
  } Xu7lV  
 } 4l@aga  
 return bRemoved; >9,LN;Ic  
} |& _(I  
jJV1 /]TJ  
void VerifyWindow() 3'!*/UnU  
{ SedVp cb+  
 for(int i=0;i<MAX_KEY;i++){ ot,=.%O  
  if(hCallWnd!=NULL){ B=HE i\55K  
   if(!IsWindow(hCallWnd)){ \u*[mrX_B:  
    hCallWnd=NULL; &F.L*M  
    HotKey=0; T\ [CQO  
    HotKeyMask=0; 6E$ET5p&l  
    KeyCount--;  @7J;}9E  
   } qT^0 %O:  
  } t[:G45].-k  
 } ) ):w`^6  
} +@dgHDJ  
Uy<n7*H  
BOOL CHookApp::InitInstance() k1fX-2H  
{ )v %tyU  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Yb?(Q %  
 hins=AfxGetInstanceHandle(); `V{'GF&[  
 InitHotkey(); %=)%$n3=-M  
 return CWinApp::InitInstance(); P,)\#([vc  
} ^qNZ!V4T  
2+|U!X  
int CHookApp::ExitInstance() c@ lH  
{ sOm&7A?  
 VerifyWindow(); DpIk$X  
 UnInit(); %$F_oO7"  
 return CWinApp::ExitInstance(); ~:N 1[  
} (H-kWT  
wu3p2#-Z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Hm]\.ZEy  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) [_HOD^  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ DI=?{A  
#if _MSC_VER > 1000 gp4@6HuUd  
#pragma once YXIAVSnr  
#endif // _MSC_VER > 1000 C~"b-T  
V1\Rj0#G  
class CCaptureDlg : public CDialog Asli<L(?`  
{ ' BY|7j~  
 // Construction :`Xg0J+P  
 public: Is>~P*2Y=  
  BOOL bTray; "]B%V!@  
  BOOL bRegistered; $ spk.j  
  BOOL RegisterHotkey(); yUvn h  
  UCHAR cKey; RP%FMb}nt  
  UCHAR cMask; \Z_29L w=  
  void DeleteIcon(); :_kZkWD5  
  void AddIcon(); B>%;"OMp  
  UINT nCount; `vD.5  
  void SaveBmp(); j"n"=rTTQ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor N^zFKDJG  
  // Dialog Data \I7,1I  
  //{{AFX_DATA(CCaptureDlg) pQk@ +r  
  enum { IDD = IDD_CAPTURE_DIALOG }; m:c .dei5  
  CComboBox m_Key; okH*2F(-  
  BOOL m_bControl; u6i X&%e  
  BOOL m_bAlt; #pk  
  BOOL m_bShift; z7R2viR[  
  CString m_Path; r tH #j  
  CString m_Number; fy={  
  //}}AFX_DATA .DHQJ|J-1  
  // ClassWizard generated virtual function overrides  e,T^8_>  
  //{{AFX_VIRTUAL(CCaptureDlg) z,(.` %h  
 public:  RAF do  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6!v$"u|[!'  
 protected: | A# \5u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0+Q; a  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); j {Sbf04  
  //}}AFX_VIRTUAL *@g>~q{`  
  // Implementation ]r>m{"~E  
 protected: ?fQ8Ff  
  HICON m_hIcon; uVa`2]NV r  
  // Generated message map functions ?4#wVzuzA  
  //{{AFX_MSG(CCaptureDlg) 63c\1]YB.  
  virtual BOOL OnInitDialog(); O#Ho08*Xn  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); a=M/0N{!  
  afx_msg void OnPaint(); 8Od7e`  
  afx_msg HCURSOR OnQueryDragIcon(); 1:Wl/9mL  
  virtual void OnCancel(); :\~YbA  
  afx_msg void OnAbout(); uIR/^o  
  afx_msg void OnBrowse(); R[}fr36>/  
  afx_msg void OnChange(); d?)Ic1][  
 //}}AFX_MSG ozW\`  
 DECLARE_MESSAGE_MAP() KU;J2Kt  
}; ,ygDNF  
#endif s,H }km  
=" pNE#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file S+GW}?!  
#include "stdafx.h" `IJTO_  
#include "Capture.h" +7r?vo1  
#include "CaptureDlg.h" H Em XB=  
#include <windowsx.h> - @tL]]  
#pragma comment(lib,"hook.lib") .qrS[ w  
#ifdef _DEBUG U+:Mu]97  
#define new DEBUG_NEW AU<A\  
#undef THIS_FILE Gp2C wyv  
static char THIS_FILE[] = __FILE__; Yduj3Ht:w  
#endif G!7A]s>C  
#define IDM_SHELL WM_USER+1 ]fJ9.Js  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?gG%FzfQ/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C;oO=R3r  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; wQojmmQ  
class CAboutDlg : public CDialog CgKFI  
{ gQuU_dbXSB  
 public: T*92o:^  
  CAboutDlg(); pd.5  
  // Dialog Data aMaqlqf  
  //{{AFX_DATA(CAboutDlg) Vw5Pgtx  
  enum { IDD = IDD_ABOUTBOX }; h`4!Qv  
  //}}AFX_DATA iw I}  
  // ClassWizard generated virtual function overrides @*iT%p_L  
  //{{AFX_VIRTUAL(CAboutDlg) Vs(D(d,  
 protected: rmPJid[8B~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support c"zE  
  //}}AFX_VIRTUAL NGkWr  
  // Implementation 6NGQU%Hd  
 protected: [9\Mf4lh#  
  //{{AFX_MSG(CAboutDlg) _g6H&no[  
  //}}AFX_MSG U[6 ~ad a  
  DECLARE_MESSAGE_MAP() 56H~MnX  
}; Za7!n{? 0  
0[ZwtfL1  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) O ;m[  
{ bDnT><eH  
 //{{AFX_DATA_INIT(CAboutDlg) \:E=B1  
 //}}AFX_DATA_INIT ,$"T/yYer  
} U[NQ"  
q1Ehl S  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) % E 8s>D  
{ @Op7OFY%  
 CDialog::DoDataExchange(pDX); O[z-K K<  
 //{{AFX_DATA_MAP(CAboutDlg) u >[hLXuB  
 //}}AFX_DATA_MAP _EC H(  
} 2cko GafG{  
Y 9@ 2d  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) M)CQ|P  
 //{{AFX_MSG_MAP(CAboutDlg) %QQJSake|  
 // No message handlers ?F9c6$|  
 //}}AFX_MSG_MAP E|x t\ *  
END_MESSAGE_MAP() q=;U(,Y  
x, #?  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) '@WS7`@-y  
: CDialog(CCaptureDlg::IDD, pParent) =Iy khrS  
{ 3mT6HGSKR  
 //{{AFX_DATA_INIT(CCaptureDlg) N9=?IFEe]  
  m_bControl = FALSE; `ex>q  
  m_bAlt = FALSE; E*VOyH 2[  
  m_bShift = FALSE; nmClP  
  m_Path = _T("c:\\"); h:4F?'W  
  m_Number = _T("0 picture captured."); bjql<x5d  
  nCount=0; _ "lW  
  bRegistered=FALSE; j9*5Kj  
  bTray=FALSE; d ZxrIWx  
 //}}AFX_DATA_INIT D()tP  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R'h.lX  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); B0m2SUC,H  
} 'J_6SD  
WJii0+8e  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) +%)bd  
{ 8WLBq-]G  
 CDialog::DoDataExchange(pDX); b@9d@@/wx  
 //{{AFX_DATA_MAP(CCaptureDlg) M`,`2I A  
  DDX_Control(pDX, IDC_KEY, m_Key); %D E_kwL  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); YeVkX{y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); oC|']r6  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 0[7tJbN  
  DDX_Text(pDX, IDC_PATH, m_Path); W"\O+  
  DDX_Text(pDX, IDC_NUMBER, m_Number); hGj`IAW  
 //}}AFX_DATA_MAP !Er)|YP  
} ;f9a0Vs  
Tr "Bz!  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) tWITr  
//{{AFX_MSG_MAP(CCaptureDlg) TH? wXd\  
 ON_WM_SYSCOMMAND() z{A~d  
 ON_WM_PAINT() 4[ =C,5r  
 ON_WM_QUERYDRAGICON() 9&'HhJm  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) "]x#kM  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) j&Y{ CFuZ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) $DhW=(YM_a  
//}}AFX_MSG_MAP Q =4~u z|  
END_MESSAGE_MAP() k;!}nQ&  
epxbTJfc  
BOOL CCaptureDlg::OnInitDialog() "1ov<  
{ ]TSzT"_r~~  
 CDialog::OnInitDialog(); #oxP,LR  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <E\vc6n  
 ASSERT(IDM_ABOUTBOX < 0xF000); Mby V_A`r_  
 CMenu* pSysMenu = GetSystemMenu(FALSE); "~6IjW*/  
 if (pSysMenu != NULL) {1[f9uPS  
 { 0EBHR Y_F  
  CString strAboutMenu; I$JyAj  
  strAboutMenu.LoadString(IDS_ABOUTBOX); P7 R}oO_n:  
  if (!strAboutMenu.IsEmpty()) (\CH;c-@  
  { PQ(/1v   
   pSysMenu->AppendMenu(MF_SEPARATOR); -5<G^AS  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~otV'=/my  
  } 8W}rS v+  
 } 2R~[B]2"r  
 SetIcon(m_hIcon, TRUE); // Set big icon c->?'h23)  
 SetIcon(m_hIcon, FALSE); // Set small icon \x=!'  
 m_Key.SetCurSel(0); p9j2jb,qy  
 RegisterHotkey(); ]vZ}4Xno  
 CMenu* pMenu=GetSystemMenu(FALSE); xH{V.n&v  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); # #/ l  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #s|,o Im  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8QN/D\uq  
 return TRUE; // return TRUE unless you set the focus to a control ?/^{sW' |  
} -'RD%_  
Ql? >,FZ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hpz DQ6-Y  
{ JwcC9 O  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) e)A{ {wD/  
 { b%|6y  
  CAboutDlg dlgAbout; *KDwl<^A  
  dlgAbout.DoModal(); f(.t0{Etq  
 } (V# *}eGy  
 else #E@X'jwu  
 { L?r\J8Ch<  
  CDialog::OnSysCommand(nID, lParam); G[\3)@I  
 } .oz(,$CS"  
} js)I%Z  
tz_WxOQ0  
void CCaptureDlg::OnPaint() _>i<`k  
{ I_On0@%T5b  
 if (IsIconic()) 7hfa?Mcz  
 { !E9A=u{  
  CPaintDC dc(this); // device context for painting <<+Hs/ ]  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !k=~a]  
  // Center icon in client rectangle UszR. Z  
  int cxIcon = GetSystemMetrics(SM_CXICON); <(B: "wI  
  int cyIcon = GetSystemMetrics(SM_CYICON);  ){xMMQ5  
  CRect rect; *" ,"u;&  
  GetClientRect(&rect); uG 7ll5Yy  
  int x = (rect.Width() - cxIcon + 1) / 2; UjH+BC+9`b  
  int y = (rect.Height() - cyIcon + 1) / 2; .*+e?-  
  // Draw the icon A3zO&4f ]  
  dc.DrawIcon(x, y, m_hIcon); $iOkn|~<@W  
 } -0Q^k\X-  
 else lZ5TDS  
 { L+TM3*a*  
  CDialog::OnPaint(); Nj;G%KAP  
 } r+;AEN48  
} 3k5F$wf  
D8wZC'7  
HCURSOR CCaptureDlg::OnQueryDragIcon() HD9+4~8  
{ M;1B}x@  
 return (HCURSOR) m_hIcon; d> L*2 g  
} L_ 2R3 w  
s&Ml1 A:  
void CCaptureDlg::OnCancel() C_ (s  
{ + u'y!@VV  
 if(bTray) Xsv^GmP+  
  DeleteIcon(); >d#Ks0\&  
  CDialog::OnCancel(); a OTrng  
} XyytO;X M-  
]6TX)1  
void CCaptureDlg::OnAbout() #;9n_)  
{ L$s ;tJ   
 CAboutDlg dlg; ?)'+l   
 dlg.DoModal(); iJ 8I# j+N  
} :gacP?  
N.qS;%*o{e  
void CCaptureDlg::OnBrowse() .T }q"  
{ ICB'?yZ,  
 CString str; 8i'EO6  
 BROWSEINFO bi; WbDD9ZS  
 char name[MAX_PATH]; ;+iw?"  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); X1; ljX  
 bi.hwndOwner=GetSafeHwnd(); `]\:%+-  
 bi.pszDisplayName=name; UA$Xa1  
 bi.lpszTitle="Select folder"; 9Z;"9$+M  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; fN{JLp  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 30nR2mB Kt  
 if(idl==NULL) FV W&)-I  
  return; CXfPC[o  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); lpHz*NZ0  
 str.ReleaseBuffer(); f+j-M|A  
 m_Path=str; SYmiDR  
 if(str.GetAt(str.GetLength()-1)!='\\') R=u!Rcv R  
  m_Path+="\\"; qLh[BR  
 UpdateData(FALSE); 9q|36CAO_  
} @8qo(7<~Q  
v^QUYsar  
void CCaptureDlg::SaveBmp() 'Xw> ?[BB  
{ 8WvQ[cd  
 CDC dc; l4`HuNR1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); cl3Dwrf?  
 CBitmap bm; O9(6?n  
 int Width=GetSystemMetrics(SM_CXSCREEN); z Qhc V  
 int Height=GetSystemMetrics(SM_CYSCREEN); CH3bpZv  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 4c/.#?  
 CDC tdc; [j^c&}0  
 tdc.CreateCompatibleDC(&dc); `L1lGlt  
 CBitmap*pOld=tdc.SelectObject(&bm); i!9|R)c  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); FeAMt  
 tdc.SelectObject(pOld); 4x%R4tk  
 BITMAP btm; skR I \  
 bm.GetBitmap(&btm); m?#J`?E  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 4+j:]poYG{  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); JK@" &  
 BITMAPINFOHEADER bih; eLc@w<yB  
 bih.biBitCount=btm.bmBitsPixel; :k*3?*'K  
 bih.biClrImportant=0; Xs7xZ$  
 bih.biClrUsed=0; iS%md  
 bih.biCompression=0; ~\~K ,v  
 bih.biHeight=btm.bmHeight; _wMYA8n  
 bih.biPlanes=1; F;@A2WD  
 bih.biSize=sizeof(BITMAPINFOHEADER);  %SSBXWP  
 bih.biSizeImage=size; z'+k]N9Q^  
 bih.biWidth=btm.bmWidth; 4RXF.kJ3=  
 bih.biXPelsPerMeter=0; #(KE9h%  
 bih.biYPelsPerMeter=0; V0!.>sX9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Sx^4Y\\  
 static int filecount=0; UAi]hUq  
 CString name; ?c!W*`yP  
 name.Format("pict%04d.bmp",filecount++); v%6mH6V  
 name=m_Path+name; CF?TW  
 BITMAPFILEHEADER bfh; iig ({b  
 bfh.bfReserved1=bfh.bfReserved2=0; Jm(sx'qPx  
 bfh.bfType=((WORD)('M'<< 8)|'B'); L% cr `<~  
 bfh.bfSize=54+size; C)|{7W  
 bfh.bfOffBits=54; qIIl,!&}A  
 CFile bf; |f.R]+cH  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [)&(zJHX  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -P5M(Rt  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); xf?6_=  
  bf.WriteHuge(lpData,size); 9:l@8^_o  
  bf.Close(); $sX X6K),  
  nCount++; Z$'483<  
 } !U2Wiks  
 GlobalFreePtr(lpData); gU^2;C  
 if(nCount==1)  b jq1",  
  m_Number.Format("%d picture captured.",nCount); 4xE [S  
 else %wD<\ XRM  
  m_Number.Format("%d pictures captured.",nCount); AX= 4{b'  
  UpdateData(FALSE); %!;6h^@  
} edW:(19}  
xNaDzu"  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5yhfCe m|  
{ * ydU3LG7  
 if(pMsg -> message == WM_KEYDOWN) [$D4U@mRp  
 { l"-F<^ U  
  if(pMsg -> wParam == VK_ESCAPE) WF.y"{6>  
   return TRUE; :$#"; t|  
  if(pMsg -> wParam == VK_RETURN) \?9{H6<=  
   return TRUE; ?\l@k(w4[x  
 } JN Ur?+g  
 return CDialog::PreTranslateMessage(pMsg); -brn&1oJ  
} ~e)`D nJ  
xqua>!mqS  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u=5~^ 9  
{ 6,*o;<k[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ y_=},a  
  SaveBmp(); 9Fkzt=(E~  
  return FALSE; u{-J?t&`  
} ]} + NT  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ua^gG3n0  
 CMenu pop; AxOn~fZ!  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Z\`i~  
 CMenu*pMenu=pop.GetSubMenu(0); 6IVa(;  
 pMenu->SetDefaultItem(ID_EXITICON); Y`x54_32  
 CPoint pt; O'G,   
 GetCursorPos(&pt); c-2##Pf_8O  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?1f(@  
 if(id==ID_EXITICON) 2bB&/Uumsd  
  DeleteIcon(); *)2& gQ&%+  
 else if(id==ID_EXIT) BtZycI  
  OnCancel(); S$Cht6m  
 return FALSE; 3r)<:4a u&  
} {bSi3oI  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jNIZ!/K  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5DHFxym'  
 AddIcon(); Ny.s u?E  
 return res; pV3o\bk!  
} j^g^=uau  
},2mIit(  
void CCaptureDlg::AddIcon() d +]Gw  
{ <oE(I)r4,  
 NOTIFYICONDATA data; (mOUbO8  
 data.cbSize=sizeof(NOTIFYICONDATA); {hr+ENgV  
 CString tip; d@:4se-q+  
 tip.LoadString(IDS_ICONTIP); hY?x14m$3  
 data.hIcon=GetIcon(0); 6+MZ39xC  
 data.hWnd=GetSafeHwnd(); gX}(6RP_!  
 strcpy(data.szTip,tip); bGl5=`  
 data.uCallbackMessage=IDM_SHELL; P(1 bd"Q  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; %D(% lh2  
 data.uID=98; llf|d'5Nl  
 Shell_NotifyIcon(NIM_ADD,&data); QT5,_+ho  
 ShowWindow(SW_HIDE); vsjl8L  
 bTray=TRUE; <fJ*{$[p  
} -N')LY  
L y!!+UM\  
void CCaptureDlg::DeleteIcon() i#@3\&{J>  
{ PTu~PVbp4  
 NOTIFYICONDATA data; ]#C;)Vy  
 data.cbSize=sizeof(NOTIFYICONDATA); #gw ys  
 data.hWnd=GetSafeHwnd(); X0=#e54  
 data.uID=98; l3sL!D1u  
 Shell_NotifyIcon(NIM_DELETE,&data); ::\7s  
 ShowWindow(SW_SHOW); PQmgv&!DP  
 SetForegroundWindow(); "g)@jqq:>  
 ShowWindow(SW_SHOWNORMAL); !,mv 7Yj  
 bTray=FALSE; 'g8~uP  
} 3w=OvafT:  
>f [Lb|t  
void CCaptureDlg::OnChange() 1!@KRV  
{ ?jywW$   
 RegisterHotkey(); 8+Y+\XZG  
} ,&II4;F  
0L "+,  
BOOL CCaptureDlg::RegisterHotkey() =R08B)yR  
{ x"@Y[  
 UpdateData(); >Lh+(M;+F  
 UCHAR mask=0; &ACM:&Ob  
 UCHAR key=0; KJ Gh)  
 if(m_bControl) :V>M{vd  
  mask|=4; kKV`9&dZe  
 if(m_bAlt) \0'7p-T6  
  mask|=2; ncEOz1u  
 if(m_bShift) dMAd-q5{  
  mask|=1; x[Xj[O  
  key=Key_Table[m_Key.GetCurSel()]; 1C[j:Ly/  
 if(bRegistered){ 5B [kZ?>  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); i-(^t1c  
  bRegistered=FALSE; [p%@ pV  
 } #`tn:cP  
 cMask=mask; Cd:ofv/3  
 cKey=key; [vuqH:Ln  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); FcnSO0G%  
 return bRegistered; $?^#G8J  
} ~ {sRK  
CD\k.  
  四、小结 JzA`*X[  
YYrXLt:  
  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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