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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: K |} ]<  
  _XNR um4  
  一、实现方法 IYg3ve`x  
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  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: @ ^6OV)  
ZfCr"aL  
#pragma data_seg("shareddata") ^1yTL5#:Vw  
HHOOK hHook =NULL; //钩子句柄 <&EO=A  
UINT nHookCount =0; //挂接的程序数目 &t|V:_?/x  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 _QUu'zJ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 G|oB'~ {&  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Y1aF._Z  
static int KeyCount =0; `=$jc4@J  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 mYOdBd  
#pragma data_seg() )LrCoI =|  
Iki+5  
  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。 xc<eU`-' b  
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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: Sb9=$0%\  
/Q>{YsRRB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 3/IWO4?_  
cKey,UCHAR cMask) <bXWkj  
{ S]%U]  
 BOOL bAdded=FALSE; A.C278^O8  
 for(int index=0;index<MAX_KEY;index++){ imCl{vt(kj  
  if(hCallWnd[index]==0){ o7a6 )2JK  
   hCallWnd[index]=hWnd; +IO1ipc4cE  
   HotKey[index]=cKey; <Dj$0g  
   HotKeyMask[index]=cMask; +;wqX]SD&  
   bAdded=TRUE; = EChH@3  
   KeyCount++; 9_A0:S9Z  
   break; ;n7|.O]*  
  } R ms01m>Y  
 } vV\F^  
 return bAdded; -,fa{yt-  
} #[0\=B -  
//删除热键 s!;VUr\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pg}+lYGP  
{ iraRB~  
 BOOL bRemoved=FALSE; -=t3O#  
 for(int index=0;index<MAX_KEY;index++){ +b,31  
  if(hCallWnd[index]==hWnd){ cYWy\+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ OQL09u  
    hCallWnd[index]=NULL; <,4R2'  
    HotKey[index]=0; vXM/nw|5  
    HotKeyMask[index]=0; l88a#zUQDN  
    bRemoved=TRUE; &c<}++'h  
    KeyCount--; R4~zL!7;  
    break; Wt)SdF=U/  
   } & A9A#It  
  } #C,f/PXfaB  
 } E4v_2Q -w  
 return bRemoved; #u<o EDQ  
} Xlqz8cI  
hr!f: D  
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  DLL中的钩子函数如下: |CZnq-,C  
Oz#EGjz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _[{:!?-?  
{ ,7fc41O3V  
 BOOL bProcessed=FALSE; *n*N|6 +  
 if(HC_ACTION==nCode) PZ!dn%4jy  
 { !G"9xrr1  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 s{z~Axup-  
   switch(wParam) APtselC  
   {  7tfivIj)e  
    case VK_MENU: ueE?"Hk  
     MaskBits&=~ALTBIT; <jRFN&"h}  
     break; D _bkUR1  
    case VK_CONTROL: +{C9uY)$vf  
     MaskBits&=~CTRLBIT; #[U 9(44,  
     break; lR@i`)'?U  
    case VK_SHIFT: $nfBv f  
     MaskBits&=~SHIFTBIT; +F7<5YW&(  
     break; 3?*M{Y|  
    default: //judge the key and send message s*)41\V0  
     break; :<t{ =0G  
   } 8G5) o`  
   for(int index=0;index<MAX_KEY;index++){ 4g6ksdFQ  
    if(hCallWnd[index]==NULL) ?lc[ hH  
     continue; H7yg9zFT N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o1#:j?sN  
    { AJ#m6`M+EK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2i7i\?<.  
     bProcessed=TRUE; s?@)a,C%k  
    } 0Y6q$h>4  
   } gP %|:"  
  } r{q}f)  
  else if((lParam&0xc000ffff)==1){ //有键按下 Q9yGQu  
   switch(wParam) :zj9%4A  
   { 2-$bh  
    case VK_MENU: [j=,g-EOA  
     MaskBits|=ALTBIT; `dgM|.w5=  
     break; !O F?xW  
    case VK_CONTROL: ;Y@!:p- H  
     MaskBits|=CTRLBIT; >St. &#c  
     break; 0E?s>-b  
    case VK_SHIFT: 62MRI    
     MaskBits|=SHIFTBIT; @QVqpE<|  
     break; &$b\=  
    default: //judge the key and send message TDAWI_83-  
     break; .B 85!lCF  
   } 43J\8WBn@  
   for(int index=0;index<MAX_KEY;index++){ $c@w$2  
    if(hCallWnd[index]==NULL) jNe(w<',P  
     continue; wUK7um  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |%'6f}fnE  
    { "+n4c'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _}I(U?Q-C  
     bProcessed=TRUE; jJ*@5?A  
    } XdGpW  
   } J7'f@X~nM  
  } 2/yXY_L  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 e$Xq    
   for(int index=0;index<MAX_KEY;index++){ C5PmLiOHY>  
    if(hCallWnd[index]==NULL) $Wr\ [P:  
     continue; tLD~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1jH7<%y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6WE&((r ^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "K|)<6J  
   } @,x_i8  
  } * MSBjH|  
 } E\]OySC%C$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Pv/Pww \  
} Sc1+(z  
> $w^%I  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Y{k>*: Ax_  
HYjMNj0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ex` xkZ+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *'9)H 0  
JkSdLj  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: yaH Trh%  
-ajM5S=d*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u\{qH!?t  
{ ]Q6+e(:~ZH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) QP6z?j.  
 { DR k]{^C~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 SXRdNPXFO  
  SaveBmp(); <91t`&aWW  
  return FALSE; 87QZun%  
 } ="uKWt6n'  
 …… //其它处理及默认处理  20I4r  
} a'@-"qk  
{fog<1c  
U/T4i#  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 xn(+G$m  
b!i`o%Vb  
  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。 rQ9*J   
)!'n&UxPo$  
  二、编程步骤 Dh2:2Rz=#7  
2.[_t/T  
  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"; g3|BE2?  
HQq`pG%m6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; t *{,Gk  
F,*2#:Ki  
  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;  28nmQ  
Ya}T2VX  
  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; H4M{_2DO  
NH'1rt(w  
  5、 添加代码,编译运行程序。 5^)?mA  
#v.L$7O  
三、程序代码 jja{*PZ6H  
JNh=fvO2i  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ^C!mCTL1N  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) M'yO+bu  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ QJx9I_  
#if _MSC_VER > 1000 DdBxqkh  
#pragma once n!GWqle  
#endif // _MSC_VER > 1000 -#hK|1]  
#ifndef __AFXWIN_H__ Q]< (bD.7  
#error include 'stdafx.h' before including this file for PCH pG/ NuImA  
#endif yh S#&)O  
#include "resource.h" // main symbols 7^ 4jcfJH  
class CHookApp : public CWinApp g[/^cJHQ  
{ O$a#2p&  
 public: }l~]b3@qu  
  CHookApp(); Mv|vRx^b  
  // Overrides p1+7 <Y:  
  // ClassWizard generated virtual function overrides |y.zo cBj  
  //{{AFX_VIRTUAL(CHookApp) b.QpHrnhtK  
 public: vFTXTbt'h  
  virtual BOOL InitInstance(); wD`[5~C{  
  virtual int ExitInstance(); >G]?  
  //}}AFX_VIRTUAL F[5S(7M 7  
  //{{AFX_MSG(CHookApp) HtxLMzgz<<  
  // NOTE - the ClassWizard will add and remove member functions here. Osnyd+dJY  
  // DO NOT EDIT what you see in these blocks of generated code ! E]NY (1  
  //}}AFX_MSG _3|6ZO  
  DECLARE_MESSAGE_MAP() Vl<`|C>  
}; r,5-XB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $4=Ne3 y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sp|q((z{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +9RJ%i&Ec  
BOOL InitHotkey(); 4<u;a46Z#M  
BOOL UnInit(); DlDB=N0@S  
#endif l{8CISO*  
Sa Cx)8ul0  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. AWO0NWTB  
#include "stdafx.h" PC|'yAN:  
#include "hook.h" C5Xof|#p|  
#include <windowsx.h> ^%;"[r  
#ifdef _DEBUG [q'eEN G  
#define new DEBUG_NEW o~= iy  
#undef THIS_FILE s3seK6x'  
static char THIS_FILE[] = __FILE__; !Q!&CG5l  
#endif pDGT@qJ  
#define MAX_KEY 100 Rfht\{N 7  
#define CTRLBIT 0x04 Yt{ji  
#define ALTBIT 0x02 {(;B5rs  
#define SHIFTBIT 0x01 cv= \g Z  
#pragma data_seg("shareddata") zhX;6= X2  
HHOOK hHook =NULL; 0C]4~F x~  
UINT nHookCount =0; o5P&JBX<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Vb2\/e:k  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Q\|18wkW  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 6J\q`q(W(  
static int KeyCount =0; D i+4Eb  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0pD[7~^o  
#pragma data_seg() ha5e(Hj?  
HINSTANCE hins; G;NB\3 ~X  
void VerifyWindow(); >PIPp7C  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8 }-7{  
//{{AFX_MSG_MAP(CHookApp) y1iX!m~)  
// NOTE - the ClassWizard will add and remove mapping macros here. ?;^5ghY$  
// DO NOT EDIT what you see in these blocks of generated code! ~ 7}]  
//}}AFX_MSG_MAP ilv_D~|  
END_MESSAGE_MAP() 7aQ n;  
6GzzG P^  
CHookApp::CHookApp()  //<:k8  
{ p5-<P?B  
 // TODO: add construction code here, `gI~|A4  
 // Place all significant initialization in InitInstance eES'}[W>  
} as(*B-_n~  
ugI#ZFjJWE  
CHookApp theApp; x9%-plP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \ n_3Bwd~  
{ Wab.|\c  
 BOOL bProcessed=FALSE; 8b7;\C~$p  
 if(HC_ACTION==nCode) )!eEO [\d  
 { OF8WDo`  
  if((lParam&0xc0000000)==0xc0000000){// Key up 12lEs3  
   switch(wParam) =UNT.]  
   { )pS8{c)E  
    case VK_MENU: g2=}G<*0  
     MaskBits&=~ALTBIT; !lhFKb;  
     break; <GaT|Hhc=  
    case VK_CONTROL: T`?n,'!(  
     MaskBits&=~CTRLBIT; &:No}6  
     break; t!{x<9  
    case VK_SHIFT: <(YF5Xm6$h  
     MaskBits&=~SHIFTBIT; FZp<|t  
     break; '0RRFO  
    default: //judge the key and send message Ff<)4`J  
     break; B'p5M.6d#:  
   } ra:GzkIw  
   for(int index=0;index<MAX_KEY;index++){ :CTL)ad2  
    if(hCallWnd[index]==NULL) E?Cj/o  
     continue; J)*8|E9P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $6!i BX@  
    { `VZZ^K9zR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *Tp]h 0  
     bProcessed=TRUE; vTd- x>n  
    } (B:uc_+  
   } {2:d` fqD  
  } (;UP%H>  
  else if((lParam&0xc000ffff)==1){ //Key down 6R2uWv  
   switch(wParam) 4%7s259%  
   { +_~,86  
    case VK_MENU: OR;&TbWF(R  
     MaskBits|=ALTBIT; ~C| ,b"  
     break; E0YU[([G  
    case VK_CONTROL:  eu9w|g  
     MaskBits|=CTRLBIT; E eB3 }  
     break; $)*xC!@6X  
    case VK_SHIFT: TKOP;[1h  
     MaskBits|=SHIFTBIT; 1Nj=B_T  
     break; ?E7=:h(@t  
    default: //judge the key and send message u!Bk,}CE`  
     break; M/#U2!iFk  
   } &z>q#'X;.  
   for(int index=0;index<MAX_KEY;index++) EwQae(PpA  
   { h<Wg3o  
    if(hCallWnd[index]==NULL) tpo>1|  
     continue; #ZWl=z5aBi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) + |C=ZU  
    { ^f|<R8`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -k{ Jp/-D  
     bProcessed=TRUE; L\L"mc|O  
    } h0Jl_f#Y  
   } }9CrFTbx;  
  } tS<h8g_  
  if(!bProcessed){ XWtiwf'K  
   for(int index=0;index<MAX_KEY;index++){ Hf%_}Du /`  
    if(hCallWnd[index]==NULL) hnzNP\$U]  
     continue; )6{P8k4Zr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1lcnRHO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <hv7s,i  
   } {|6z+vR  
  } gz61FW  
 } 5B*qbM  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); s;1e0n  
} ^|?1_r  
?3jdg]&  
BOOL InitHotkey() |<(t}}X  
{ XLb0 9;  
 if(hHook!=NULL){ tjxvN 4l  
  nHookCount++; jczq `yW  
  return TRUE; i03gX<=*  
 } t`u!]DHv  
 else d>!p=O`>{q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); {/ &B!zvl  
  if(hHook!=NULL) 31}W6l88c  
   nHookCount++; 9j#@p   
  return (hHook!=NULL); A[H;WKn0  
} x=,8[W#XT  
BOOL UnInit() H]Wp%"L  
{  $Nu)E  
 if(nHookCount>1){ C[YnrI!  
  nHookCount--; +'XhC#:  
  return TRUE; FkB{ SC J  
 } 1;Xgc@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); m r4b  
 if(unhooked==TRUE){ 10MU-h.)  
  nHookCount=0; \hbiU ]  
  hHook=NULL; gs`> C(  
 } [5Y<7DS  
 return unhooked; ~NNv>5 t5  
}  %+wF"  
hhmGv9P  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Km*<Kfcz  
{ lIh[|]  
 BOOL bAdded=FALSE; <AUWby,"  
 for(int index=0;index<MAX_KEY;index++){ /s[DI;M$o  
  if(hCallWnd[index]==0){ ``9 GY  
   hCallWnd[index]=hWnd; ^,V[nfQR  
   HotKey[index]=cKey; <TxC!{<  
   HotKeyMask[index]=cMask; *48IF33&s  
   bAdded=TRUE; 254~:eB0  
   KeyCount++; XDYosC:  
   break; |+NuYz?  
  } p5<2N  
 } /2@["*^$  
 return bAdded; I7mG/  
} I KcKRw/O$  
;fGx;D  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B*,?C]0{  
{  Oh`2tc-  
 BOOL bRemoved=FALSE; (X}@^]lpa  
 for(int index=0;index<MAX_KEY;index++){ YKs4{?vw  
  if(hCallWnd[index]==hWnd){ 1V%'.l9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &1GUi{I  
    hCallWnd[index]=NULL; aws"3O% uW  
    HotKey[index]=0; 8R xc&`_X  
    HotKeyMask[index]=0; #J$qa Ul  
    bRemoved=TRUE; ( v@jc8y  
    KeyCount--; 6vp0*ww  
    break; FFe) e>bH  
   } SLoo:)  
  } 6c<ezEJ  
 } Jps .;yjk  
 return bRemoved; ;&?pd"^<_Z  
} n}J^6:1  
.Z%G@X*  
void VerifyWindow() >;nS8{2o  
{ iZ; TYcT  
 for(int i=0;i<MAX_KEY;i++){ np6HUH  
  if(hCallWnd!=NULL){ Pp_V5,i\  
   if(!IsWindow(hCallWnd)){ &1Fply7(Ay  
    hCallWnd=NULL; Z nXejpj)D  
    HotKey=0; 2P5_zND  
    HotKeyMask=0; _e'Y3:  
    KeyCount--; (ZPXdr  
   } !k<:k "7  
  } `="v>qN2\  
 } gb 4pN  
} nGrVw&  
a$}mWPp+f  
BOOL CHookApp::InitInstance() U:lv^ QPG  
{ 2k1aX~?  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); z[&s5"  
 hins=AfxGetInstanceHandle(); )saR0{e0N  
 InitHotkey(); D,rZ0?R  
 return CWinApp::InitInstance(); Z+idLbIs  
} qm(1:iK,0  
1^{`lK~2  
int CHookApp::ExitInstance() $']VQ4tZ  
{ 40K2uT{cq  
 VerifyWindow(); <NB41/  
 UnInit(); (0jr;jv  
 return CWinApp::ExitInstance(); #":a6%0Q  
} JJf<*j^G  
(5`T+pAsV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file N z~" vi(t  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1D{#rA.X  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ -M61 Mw1  
#if _MSC_VER > 1000 G) 7)]yBL  
#pragma once 9 5 H?{  
#endif // _MSC_VER > 1000 <_:zI r,  
(pYYkR"  
class CCaptureDlg : public CDialog H(qm>h$bU  
{ E $6ejGw-  
 // Construction 1dv=xe.  
 public: ;^-:b(E  
  BOOL bTray; [7\>"v6  
  BOOL bRegistered; e4.&aIC[  
  BOOL RegisterHotkey(); Y60"M4j  
  UCHAR cKey; . U/k<v<)6  
  UCHAR cMask; a %K}j\M  
  void DeleteIcon(); )HVcG0H1  
  void AddIcon(); Tsz NlRxc  
  UINT nCount; C\Ayv)S #2  
  void SaveBmp(); pm]fQ uq  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor *not.2+  
  // Dialog Data V}9;eJRvw  
  //{{AFX_DATA(CCaptureDlg) s4t0f_vj`  
  enum { IDD = IDD_CAPTURE_DIALOG }; /V^sJ($V$~  
  CComboBox m_Key; "ahvNx;x  
  BOOL m_bControl; Qpu3(`d<  
  BOOL m_bAlt; 'ZnIRE,N  
  BOOL m_bShift; -:]@HD:  
  CString m_Path; -JTG?JOd]  
  CString m_Number; r_2b tpL^  
  //}}AFX_DATA Y'N'hRD  
  // ClassWizard generated virtual function overrides - ]Y wl  
  //{{AFX_VIRTUAL(CCaptureDlg) 6k9LxC:M  
 public: UqtHxEI%R~  
  virtual BOOL PreTranslateMessage(MSG* pMsg); T[2}p=<%  
 protected: )%mAZk-*;^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3{3/: 7  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ` clB43 i  
  //}}AFX_VIRTUAL gX*K&*q   
  // Implementation gaeOgP.0  
 protected: J}@GKNm  
  HICON m_hIcon; ~B_ D@gV|  
  // Generated message map functions _!:@w9  
  //{{AFX_MSG(CCaptureDlg) Efr&12YSS  
  virtual BOOL OnInitDialog(); _4R,Ej}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); zilaP)5x6  
  afx_msg void OnPaint(); (=JueF@J  
  afx_msg HCURSOR OnQueryDragIcon(); ( u f5\}x  
  virtual void OnCancel(); kaFnw(xa  
  afx_msg void OnAbout(); 8"M<{72U]  
  afx_msg void OnBrowse(); p\S8oHWe  
  afx_msg void OnChange(); `C'}e  
 //}}AFX_MSG V^En8  
 DECLARE_MESSAGE_MAP() cU+>|'f &  
}; d8:C3R  
#endif Bp3L>AcVu  
SDc" 4g`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file yWHne~!  
#include "stdafx.h" X47Ol  
#include "Capture.h" 3w'W~  
#include "CaptureDlg.h" o!Fl]3F  
#include <windowsx.h> H#+xKYrp  
#pragma comment(lib,"hook.lib") tpU D0Z)  
#ifdef _DEBUG .B$h2#i1  
#define new DEBUG_NEW a:u}d7T3e  
#undef THIS_FILE ]u=Ca#!'  
static char THIS_FILE[] = __FILE__; kF-TG3  
#endif :`J>bHE  
#define IDM_SHELL WM_USER+1 M=%!IT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s.y}U5Ty?P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g1qi\axm  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 'v`_Ii|-  
class CAboutDlg : public CDialog h{/ve`F>@  
{ ^<;w+%[MT  
 public: Wk[)+\WQ?  
  CAboutDlg(); @L;C_GEa  
  // Dialog Data XS|mKuMc C  
  //{{AFX_DATA(CAboutDlg) 8c).8RLf  
  enum { IDD = IDD_ABOUTBOX }; mP!N<K  
  //}}AFX_DATA ) `I=oB  
  // ClassWizard generated virtual function overrides 7@P656{  
  //{{AFX_VIRTUAL(CAboutDlg) RpN <=  
 protected: -eL'KO5'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /f&By p  
  //}}AFX_VIRTUAL b *9-}g:  
  // Implementation *?N<S$m  
 protected: <E}N=J'uJ  
  //{{AFX_MSG(CAboutDlg) t/ eo]  
  //}}AFX_MSG PYieD}'  
  DECLARE_MESSAGE_MAP() RbAt3k;y  
}; ]) n0MF)p  
g7Z9F[d  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) DMMLzS0A  
{ ^&m?qKN8  
 //{{AFX_DATA_INIT(CAboutDlg) .e$%[ )D  
 //}}AFX_DATA_INIT 'w6hW7"L  
} i+AUQ0Zbf6  
[q$e6JwAt  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) pqq?*\W&[v  
{ \HG$V>2  
 CDialog::DoDataExchange(pDX); hVZo"XUb  
 //{{AFX_DATA_MAP(CAboutDlg) JUU&Z[6J  
 //}}AFX_DATA_MAP ;]@exp 5  
} V{$Sfmey  
,s? dAy5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Ff)@L-Y\K  
 //{{AFX_MSG_MAP(CAboutDlg) P;c0L;/  
 // No message handlers w, 7Cr  
 //}}AFX_MSG_MAP z1Q2*:)c  
END_MESSAGE_MAP() p1^0{ILx  
lh$CWsx  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -<d(  
: CDialog(CCaptureDlg::IDD, pParent) !x_t`78T  
{ 6eo4#/+%  
 //{{AFX_DATA_INIT(CCaptureDlg) H:Lt$  
  m_bControl = FALSE; r=0j7^B#  
  m_bAlt = FALSE; m&cvU>lC  
  m_bShift = FALSE; I-{^[pp  
  m_Path = _T("c:\\"); %^!aB  
  m_Number = _T("0 picture captured."); >[P%Ty);  
  nCount=0; l/F!Bq[*g  
  bRegistered=FALSE; eP?~- #  
  bTray=FALSE; %`oHemSy  
 //}}AFX_DATA_INIT 0BDoBR  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s7M}NA 0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^$}/|d(  
} Gc^t%Ue-H)  
,-:a?#f>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) P57GqT  
{ U2UyN9:6F  
 CDialog::DoDataExchange(pDX); :iEAUM  
 //{{AFX_DATA_MAP(CCaptureDlg) 9'X@@6b*'  
  DDX_Control(pDX, IDC_KEY, m_Key); B~rU1Y)  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); raF] k0{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); BPiiexTV9  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); E [*0Bo]  
  DDX_Text(pDX, IDC_PATH, m_Path); 7vq DZg  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8~qlLa>jc  
 //}}AFX_DATA_MAP ^k;mn-0  
} 1b+h>.gWar  
m2ox8(sd  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  feN!_ -  
//{{AFX_MSG_MAP(CCaptureDlg) dFMAh&:>  
 ON_WM_SYSCOMMAND() |Q6h /"2  
 ON_WM_PAINT() Qpw@MF2P  
 ON_WM_QUERYDRAGICON() 22'vm~2E  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) & L'6KEahR  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) _j>L4bT  
 ON_BN_CLICKED(ID_CHANGE, OnChange) h[,XemwX  
//}}AFX_MSG_MAP Oc~VHT  
END_MESSAGE_MAP() F;W'  
aPt{C3<  
BOOL CCaptureDlg::OnInitDialog() FR(QFt!g  
{ w_!%'9m>  
 CDialog::OnInitDialog(); 2$Wo&Q^_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7P c(<Ui+  
 ASSERT(IDM_ABOUTBOX < 0xF000); {yU0D*#6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 4`6< {  
 if (pSysMenu != NULL) ExqM1&zpK  
 { }Q ;BQ2[  
  CString strAboutMenu; k|5k8CRX  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +8eVj#N  
  if (!strAboutMenu.IsEmpty()) }EP|Mb  
  { I<KCt2:X  
   pSysMenu->AppendMenu(MF_SEPARATOR); Cg7)S[zl  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); c~37 +^B:  
  } :^5>wDu{  
 } b( 1 :w"wD  
 SetIcon(m_hIcon, TRUE); // Set big icon d96fjj~  
 SetIcon(m_hIcon, FALSE); // Set small icon &rcdr+'  
 m_Key.SetCurSel(0); s4N,^_j  
 RegisterHotkey(); _trpXkQp  
 CMenu* pMenu=GetSystemMenu(FALSE); "H@Fe  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Eny!R@u7q  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ] .`_, IO  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); k3#wLJ  
 return TRUE; // return TRUE unless you set the focus to a control yduuFK  
} wZ O@J|  
^t7_3%%w  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) zNwc((  
{ ,k\/]9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 2zM-Ob<U`  
 { i!tc  
  CAboutDlg dlgAbout; y{?Kao7Ij  
  dlgAbout.DoModal(); >gF-6nPQ  
 } c|+y9(0|y  
 else *s~i 2}  
 { +~:x}QwGT  
  CDialog::OnSysCommand(nID, lParam); n}f3Vrl  
 } `{Hb2 }L5  
} /K[]B]1NE  
^SgN(-QH  
void CCaptureDlg::OnPaint() |Cu1uwy  
{ m+p4Mc%u  
 if (IsIconic()) URk$}_39  
 { GG*BN<(>!  
  CPaintDC dc(this); // device context for painting g4i #1V=  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); b13nE .  
  // Center icon in client rectangle YN$`y1V  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^^7gDgT  
  int cyIcon = GetSystemMetrics(SM_CYICON); n00z8B1j(l  
  CRect rect; UYH|?Jw!N  
  GetClientRect(&rect); 5R)[Ou.  
  int x = (rect.Width() - cxIcon + 1) / 2; RZ<.\N (M  
  int y = (rect.Height() - cyIcon + 1) / 2; ": nI_~q  
  // Draw the icon $G)&J2zL  
  dc.DrawIcon(x, y, m_hIcon); 75<el.'H  
 } )G mb? !/^  
 else ?,!uA)({n  
 { 4_WH 6Z  
  CDialog::OnPaint(); v [dAywW  
 } ?l(nM+[kSL  
} z"9aAytd  
r.?qEe8VV  
HCURSOR CCaptureDlg::OnQueryDragIcon() Cy]"  
{ a$A2IkD  
 return (HCURSOR) m_hIcon; f]hBPkZ6  
} 5VuC U  
B5 D3_ iX]  
void CCaptureDlg::OnCancel() 9#Z zE/  
{ ~ 0av3G  
 if(bTray) BF>T*Z-Ki  
  DeleteIcon(); 1xq3RD  
  CDialog::OnCancel(); kja4!_d  
} 6V+V zDo  
L(W%~UGN V  
void CCaptureDlg::OnAbout() LE<:.?<Z-  
{ D\@e{.$MZ|  
 CAboutDlg dlg; y|$vtD%c  
 dlg.DoModal(); >xk lt"*U,  
} suzFcLxo  
Oib[\O7[z  
void CCaptureDlg::OnBrowse() |{zHM23gD  
{ er#8D6*  
 CString str; kx:c*3q.k  
 BROWSEINFO bi; S_a :ML<  
 char name[MAX_PATH]; K<D`(voL  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); lp?i_p/z  
 bi.hwndOwner=GetSafeHwnd(); L00Sp#$\  
 bi.pszDisplayName=name; ]6jHIk|  
 bi.lpszTitle="Select folder"; i-|/2I9%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ,xm;JXJ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 8}Fw%;Cb  
 if(idl==NULL) !IfI-Q  
  return; ^- u[q- !  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =PI^X\if88  
 str.ReleaseBuffer(); >hHJ:5y  
 m_Path=str; t `N ">c"  
 if(str.GetAt(str.GetLength()-1)!='\\') c(QG4.)m  
  m_Path+="\\"; ?ykVfO'  
 UpdateData(FALSE); .`:oP&9r  
} ' m  
BERn _5gb  
void CCaptureDlg::SaveBmp() Tnzco  
{ z4 GN8:~x  
 CDC dc; xgZV0!%  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); n ;Ql=4  
 CBitmap bm; SD)5?{6<  
 int Width=GetSystemMetrics(SM_CXSCREEN); 45]Ym{]  
 int Height=GetSystemMetrics(SM_CYSCREEN); 7f.4/x^  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  EGp~Vo-  
 CDC tdc; WZfk}To1#  
 tdc.CreateCompatibleDC(&dc); }|w=7^1z  
 CBitmap*pOld=tdc.SelectObject(&bm); 0sq=5 BnO  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )pkhir06t  
 tdc.SelectObject(pOld); \] tq7  
 BITMAP btm; <1;,B%_^  
 bm.GetBitmap(&btm); K0d-MC   
 DWORD size=btm.bmWidthBytes*btm.bmHeight; s :-8 Z\,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); i{Y=!r5r  
 BITMAPINFOHEADER bih; K,`).YK  
 bih.biBitCount=btm.bmBitsPixel; IKNFYe[9e  
 bih.biClrImportant=0; .=.yZ  
 bih.biClrUsed=0; {hkM*:U  
 bih.biCompression=0; s!8J.hD'I  
 bih.biHeight=btm.bmHeight; C:|q'"F  
 bih.biPlanes=1; j1'xp`jgv  
 bih.biSize=sizeof(BITMAPINFOHEADER); x!Z:K5%O  
 bih.biSizeImage=size; F{a0X0ru~  
 bih.biWidth=btm.bmWidth; tJ(c<:zD  
 bih.biXPelsPerMeter=0; ~9`^72  
 bih.biYPelsPerMeter=0; r6gt9u:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9,Crmbw8  
 static int filecount=0; BN<#x@m$]  
 CString name; V0SW 5 m  
 name.Format("pict%04d.bmp",filecount++); =)"NE>  
 name=m_Path+name; &0;{lS[N:L  
 BITMAPFILEHEADER bfh; ,kGw;8X  
 bfh.bfReserved1=bfh.bfReserved2=0; N"q+UCRC  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +X2 i/}  
 bfh.bfSize=54+size; k1QpX@  
 bfh.bfOffBits=54; rw}5nv  
 CFile bf; qv ;1$  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ qaCi)f!Dl  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); rR),~ @]sL  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); G#9o?  
  bf.WriteHuge(lpData,size); }J'5EAp  
  bf.Close(); >#"jfjDuR  
  nCount++; mVc'%cPaw  
 } {2'74  
 GlobalFreePtr(lpData); W<cW;mO  
 if(nCount==1) tk3<sr"IQ  
  m_Number.Format("%d picture captured.",nCount); ne !j%9Ar  
 else 7gZVg@   
  m_Number.Format("%d pictures captured.",nCount); jm#F*F vL  
  UpdateData(FALSE); Q G=-LXv:@  
} ,q'gG`M N  
34++Rr [G  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Mc#O+'](f  
{ vV:M S O'r  
 if(pMsg -> message == WM_KEYDOWN) )<]w23i  
 { q>(I*=7  
  if(pMsg -> wParam == VK_ESCAPE) aPY>fy^8D  
   return TRUE; 82Z[eo  
  if(pMsg -> wParam == VK_RETURN) E,ZB;  
   return TRUE; "c! oOaA  
 } kMJQeo79  
 return CDialog::PreTranslateMessage(pMsg); Z;"4$@|qE  
} ^w&5@3d  
O3<Y_I^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c4qp3B_w  
{ M'>D[5;N~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \M'bY:  
  SaveBmp(); )\I? EU8  
  return FALSE; Up!ZCZ$RC  
} <x>k3bD  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "Dmw -  
 CMenu pop; vP87{J*DE1  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =Nv= Q mO  
 CMenu*pMenu=pop.GetSubMenu(0); +,{Wcb  
 pMenu->SetDefaultItem(ID_EXITICON); _($-dJ {  
 CPoint pt; yuy+}]uB@  
 GetCursorPos(&pt); \KnD"0KW   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); jr#g>7yM  
 if(id==ID_EXITICON) #<WyId(  
  DeleteIcon(); %x'bo>h@  
 else if(id==ID_EXIT) ;I`,ZKY  
  OnCancel(); |Ad6~E+aL-  
 return FALSE; #0YzPMV  
} Ck/_UY|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); D<D k1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) m|e*Jc  
 AddIcon(); @dT: 1s  
 return res; E^EU+})Ujr  
} ai;gca_P#  
J?n)FgxS  
void CCaptureDlg::AddIcon() [-:<z?(n4  
{ :)+@qxTy  
 NOTIFYICONDATA data; )kY _"= d  
 data.cbSize=sizeof(NOTIFYICONDATA); 23u1nU[0  
 CString tip; 3<UDVt@0  
 tip.LoadString(IDS_ICONTIP); \$~oH3m&  
 data.hIcon=GetIcon(0); oX:1 qJrC  
 data.hWnd=GetSafeHwnd(); Z imMjZ%4  
 strcpy(data.szTip,tip); 13>3R+o  
 data.uCallbackMessage=IDM_SHELL; )o'U0rAx|a  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &"H<+>`  
 data.uID=98; 4-}A'fTU8  
 Shell_NotifyIcon(NIM_ADD,&data); @L>NN>?SGQ  
 ShowWindow(SW_HIDE); >gOI]*!5  
 bTray=TRUE; WT ~dA95  
} (-Ct!aW|  
L9unhx  
void CCaptureDlg::DeleteIcon() 9^ *ZH1  
{ RwE*0 T  
 NOTIFYICONDATA data; Cf1wM:K|8  
 data.cbSize=sizeof(NOTIFYICONDATA); )zL"r8si  
 data.hWnd=GetSafeHwnd(); XB!`*vZ/<  
 data.uID=98; 5(MZ%-~l  
 Shell_NotifyIcon(NIM_DELETE,&data); [;V1y`/K1  
 ShowWindow(SW_SHOW); Er)_[^) HG  
 SetForegroundWindow(); HBga'xJ  
 ShowWindow(SW_SHOWNORMAL); Sfr\%Buv  
 bTray=FALSE; lJ>QTZH!wW  
} /YugQ.>| l  
}Cq9{0by?a  
void CCaptureDlg::OnChange() :'=~/GR  
{ j2{,1hj  
 RegisterHotkey(); l]kl V+9t  
} Bg+]_:<U  
Zxxy1Fl#.[  
BOOL CCaptureDlg::RegisterHotkey() XdIVMXLL\  
{ ^s(X VVA  
 UpdateData(); IIt^e#s&  
 UCHAR mask=0; (.XDf3   
 UCHAR key=0; ]x(2}h^ S  
 if(m_bControl) z:Zn.e*$b  
  mask|=4; 7s fuju(  
 if(m_bAlt) 9bcyPN  
  mask|=2; 'B<qG<>  
 if(m_bShift) m5;[,He  
  mask|=1; 5vh"PlK`s  
  key=Key_Table[m_Key.GetCurSel()]; ao" ;5 m  
 if(bRegistered){ J&U0y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8,H5G`  
  bRegistered=FALSE; feq6!k7  
 } kx:lk+Tx  
 cMask=mask; W!4V: (T  
 cKey=key; 7Ae,|k  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g$-D?~(Z  
 return bRegistered; +@7x45;D  
} &F*QYz[  
1PTu3o&3  
  四、小结 @Jn:!8U0  
w KMk|y>  
  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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