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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~HYN  
  .kgt? r  
  一、实现方法 X!@ Y ,  
"M^mJl&*b  
  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: ySF^^X $J  
E Q:6R|L  
#pragma data_seg("shareddata") |=V~CQ]  
HHOOK hHook =NULL; //钩子句柄 rD9:4W`^  
UINT nHookCount =0; //挂接的程序数目 |.- Muv  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 %7?Z|'\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 8`90a\t'Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey D#^euNiWd  
static int KeyCount =0; u*rHKZ9i  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 q0NToVo@  
#pragma data_seg() D6C h6i5$  
BPVOBL@   
  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。 }d5~w[  
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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: \l`{u)V  
H?V b   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6)>otB8)J  
cKey,UCHAR cMask) U\-R'Z>M  
{ rZ2cC#  
 BOOL bAdded=FALSE; %J1oz3n  
 for(int index=0;index<MAX_KEY;index++){ Jje!*?&8X  
  if(hCallWnd[index]==0){ W! J@30  
   hCallWnd[index]=hWnd; k~, k@mR  
   HotKey[index]=cKey; ,ne3uPRu7~  
   HotKeyMask[index]=cMask; ,lFp4 C  
   bAdded=TRUE; m1xR uj]  
   KeyCount++; 'u d[#@2  
   break; #Jr4LQ@A9  
  } FPM l;0{  
 } Iv*u#]{t  
 return bAdded; wzBI<0]z  
} 9`M7 -{  
//删除热键 sa"}9IE*8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \0&F'V  
{ M Ih\z7gW  
 BOOL bRemoved=FALSE; z<.?8bd  
 for(int index=0;index<MAX_KEY;index++){ #&%>kfeJ)<  
  if(hCallWnd[index]==hWnd){ i?7 ?I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "b%FkD  
    hCallWnd[index]=NULL; kv;P2:"|  
    HotKey[index]=0; Z#YNL-x  
    HotKeyMask[index]=0; R dNL f  
    bRemoved=TRUE; p+d O w #  
    KeyCount--; (%"9LYv  
    break; {faIyKtW  
   }  M+:9U&>  
  } )ybF@emc  
 } 2. v<pqn  
 return bRemoved; > `0mn|+  
} %E"Z &_3{  
;|:R*(2   
*%E\mu,,c  
  DLL中的钩子函数如下: c]/S<w<  
xErb11  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;uzLa%JQ  
{ 'g3T'2"`5  
 BOOL bProcessed=FALSE; +(^H L3  
 if(HC_ACTION==nCode) 8IE^u<H(:  
 { %Y>E  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 E>`|?DE@  
   switch(wParam) j0s$}FPUI  
   {  ?nWzJ5w3  
    case VK_MENU: 3xiDt?&H  
     MaskBits&=~ALTBIT; g(,^'; j  
     break; T k@~w  
    case VK_CONTROL: 4S[UJ%  
     MaskBits&=~CTRLBIT; d`~~Ww1  
     break; 5}c8v2R:B  
    case VK_SHIFT: FZLx.3k4  
     MaskBits&=~SHIFTBIT; c] t@3m  
     break; h_SkX@"/-  
    default: //judge the key and send message  Lw%_xRn)  
     break; [^^Pl:+  
   } $48 Z>ij?f  
   for(int index=0;index<MAX_KEY;index++){ D3%2O`9  
    if(hCallWnd[index]==NULL) d`=LZio  
     continue; _ElG&hyp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `!AI:c*3p1  
    { DuIXv7"[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  WjCxTBI  
     bProcessed=TRUE; A7|L|+ ?  
    } "F6gV;{Bt  
   } K<kl2#  
  } G=SMz+z  
  else if((lParam&0xc000ffff)==1){ //有键按下 76KNgV)3  
   switch(wParam) ={+8jQqi1  
   { 9C0#K\  
    case VK_MENU: 1:>F{g  
     MaskBits|=ALTBIT; +C[g>c}d  
     break; 1ANb=X|hig  
    case VK_CONTROL: w~ON861  
     MaskBits|=CTRLBIT; $2RSYI`py  
     break; lW|v_oP9  
    case VK_SHIFT: Aa4Tq2G  
     MaskBits|=SHIFTBIT; j4+Px%sW  
     break; e<[ ] W4"A  
    default: //judge the key and send message ;_2+Y^Qb  
     break; N_Kdi%q  
   } Vzo< ma^  
   for(int index=0;index<MAX_KEY;index++){ 5t"FNL <(M  
    if(hCallWnd[index]==NULL) DfP-(Lm)  
     continue; C+[)^ 2M{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aB?usVoS  
    { aT(_c/t.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #sDb611}#  
     bProcessed=TRUE; #V%98|"  
    } v(!:HK0oeT  
   } YRFz ]  
  } B?- poB&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 - l^3>!MAM  
   for(int index=0;index<MAX_KEY;index++){ 9 <{C9  
    if(hCallWnd[index]==NULL)  qLP/z  
     continue; C4P<GtR9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0;=- x"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KIag(!&  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^_<|~  
   } i7e6lC  
  } Y#tur`N  
 } y&-QLX L  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); TEMxjowr  
} I.GoY[u_%  
>%0$AW|Exu  
  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: _B&Lyg !J  
!!H"B('m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l{>j8Ln  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r[H8;&EL  
"aCAA#$J  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: e,MsF4'  
;R[3nb9%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2\QsF,@`YU  
{ 9 fYNSr  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?%}!_F`h%  
 { #/f~LTE  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 .V?[<}OJn  
  SaveBmp(); 8/BMFRJ  
  return FALSE; pDSNI2  
 } xZlCFu   
 …… //其它处理及默认处理 +38R#2JV  
} +E_yEH7_)  
{svo!pN:  
[nPs  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 /:' >-253  
[!-gb+L  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 G0Qw& mqF  
Vm>EF~r  
  二、编程步骤 ,<r&] eC  
UNff &E-  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; <7`zc7c]#  
Fu tS  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Mjy:k|aY"  
T?t/[iuHrj  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; .8Bo5)q$a-  
?'9IgT[*  
  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; d%"XsbO  
LzNfMvh  
  5、 添加代码,编译运行程序。 .  yg#  
Cl]?qH*:  
三、程序代码 @XV&^l -  
2_+>a"8Y  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6 AGZ)gX  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) rUj\F9*5#  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]b!n ;{5  
#if _MSC_VER > 1000 dkZe.pv$j  
#pragma once v#d\YV{I  
#endif // _MSC_VER > 1000 I /MY4?(T  
#ifndef __AFXWIN_H__ bYnq,JRA  
#error include 'stdafx.h' before including this file for PCH $2?AJ/2r$b  
#endif 0!_?\)X  
#include "resource.h" // main symbols R=lw}jH[Z  
class CHookApp : public CWinApp ;*M@LP{*L  
{ '#V@a  
 public: _>R aw  
  CHookApp(); h<`aL;.g  
  // Overrides MQ-u9=ys  
  // ClassWizard generated virtual function overrides {;c'@U  
  //{{AFX_VIRTUAL(CHookApp) nQjpJ /=  
 public: '\tI|  
  virtual BOOL InitInstance(); cR/Nl pX  
  virtual int ExitInstance(); )hXTgUZa  
  //}}AFX_VIRTUAL Gl1XRNy C  
  //{{AFX_MSG(CHookApp) 6FA+q YSV  
  // NOTE - the ClassWizard will add and remove member functions here. o8 JOpD  
  // DO NOT EDIT what you see in these blocks of generated code ! < $0is:]  
  //}}AFX_MSG 4a+gM._+O  
  DECLARE_MESSAGE_MAP() 'bi;Y1:  
}; dm4Q'u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ` 3qf}=Z`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <m]0!ii  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 49~d6fH  
BOOL InitHotkey(); H@=oVyn/  
BOOL UnInit(); ZH_$Q$9  
#endif Q'/sP 5Pj  
d +D~NA[M  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Zj2 si  
#include "stdafx.h" t]$n~!  
#include "hook.h" usB*Wn8  
#include <windowsx.h> w={q@. g%  
#ifdef _DEBUG o@e/P;E  
#define new DEBUG_NEW %N*[{j= ^  
#undef THIS_FILE i[!|0U`p  
static char THIS_FILE[] = __FILE__; J rx^  
#endif g<W]NYm  
#define MAX_KEY 100 $nO~A7  
#define CTRLBIT 0x04 mH&7{2r  
#define ALTBIT 0x02 &q-&%~E@  
#define SHIFTBIT 0x01  AG@gOm  
#pragma data_seg("shareddata") c>_ti+  
HHOOK hHook =NULL; Hd|[>4Z  
UINT nHookCount =0; <l{oE? N  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 0Z1ksfLU  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  ES~b f  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey u}[ a  
static int KeyCount =0; q!y.cyL  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift aDF@A S  
#pragma data_seg() P}v ;d]  
HINSTANCE hins; u 2 s  
void VerifyWindow(); pAE (i7  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) yV(#z2|  
//{{AFX_MSG_MAP(CHookApp) ]F4QZV( M  
// NOTE - the ClassWizard will add and remove mapping macros here. ,|:.0g[n  
// DO NOT EDIT what you see in these blocks of generated code! qzUiBwUi@  
//}}AFX_MSG_MAP y2jv84 M  
END_MESSAGE_MAP() S hI1f  
.~f )4'T 9  
CHookApp::CHookApp() R^l0Bu]X  
{ (p-q>@m  
 // TODO: add construction code here, Kjd3!%4mB  
 // Place all significant initialization in InitInstance Qr$'Q7  
} :y-;V  
.<%tu 0  
CHookApp theApp; z1J)./BO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >1j#XA8  
{ q]? qeF[  
 BOOL bProcessed=FALSE; 1K#>^!?M  
 if(HC_ACTION==nCode) 4X+xh|R:U  
 { TEz;:*,CG  
  if((lParam&0xc0000000)==0xc0000000){// Key up .G{cx=;  
   switch(wParam) 3K &637  
   { W{F)YyR{.  
    case VK_MENU: z9aR/:W}  
     MaskBits&=~ALTBIT; |]?f6^ |4  
     break; F1#{(uW  
    case VK_CONTROL: q`*.F#/4c  
     MaskBits&=~CTRLBIT; J4T"O<i$58  
     break; >3!~U.AA'x  
    case VK_SHIFT: o[ZjXLJzV  
     MaskBits&=~SHIFTBIT; _J1\c~ke"  
     break; zm&[K53  
    default: //judge the key and send message 2{79,Js0  
     break; lVvcrU  
   } uy {O   
   for(int index=0;index<MAX_KEY;index++){ 46>rvy.r  
    if(hCallWnd[index]==NULL) zPaubqB  
     continue; CvU$Fsb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >+M[!;m}  
    { 8^UF0>`'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); xt^1,V4Ei~  
     bProcessed=TRUE; }Va((X w  
    } 6$urrSQ`N0  
   } nwFBuP<LR  
  } MQoA\  
  else if((lParam&0xc000ffff)==1){ //Key down }~ D WB"  
   switch(wParam) qp})4XTv  
   { &-=~8  
    case VK_MENU: JwSF}kNs}  
     MaskBits|=ALTBIT; hxoajexU  
     break; Cbff:IP  
    case VK_CONTROL: oco,sxT  
     MaskBits|=CTRLBIT; z!g$#hmL>  
     break; \s)MN s  
    case VK_SHIFT: pJHdY)Cz  
     MaskBits|=SHIFTBIT; UIAazDyC  
     break; w"' Pn`T  
    default: //judge the key and send message |T<aWZb^=  
     break; :h(HKMSk1  
   } rfwJLl/  
   for(int index=0;index<MAX_KEY;index++) )\1>)BJq  
   { ~B;}jI]d[  
    if(hCallWnd[index]==NULL) w%])  
     continue; (<Cq_K w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t\Vng0  
    { %~Yo{4mHs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;Nn(  
     bProcessed=TRUE; 4S26TgY  
    } )L b` 4B  
   } F$t]JM  
  } k4q":}M  
  if(!bProcessed){ Lf9hOMHx  
   for(int index=0;index<MAX_KEY;index++){ Ey=2 zo^F  
    if(hCallWnd[index]==NULL) f;'*((  
     continue; x=DxD&I!J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Bp^LLH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _lv{8vf1B  
   } vMz|'-rm$  
  } ZXnacc~s  
 } u "0{) ,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); cEL:5*cAU}  
} ?}?"m:=  
[icD*N<Gc  
BOOL InitHotkey() u> {aF{  
{ 'yiv.<4  
 if(hHook!=NULL){ vkG#G]Qs";  
  nHookCount++; E)*ht;u  
  return TRUE; &wQ;J)13  
 } .YF1H<gwa  
 else !ZTghX}D  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); PNm@mC_fh  
  if(hHook!=NULL) |+Wn5iT  
   nHookCount++; |ke0G  
  return (hHook!=NULL); -64l f-<  
} `3\aX|4@  
BOOL UnInit() 2K:A4)jZ  
{ Tt: (l/1  
 if(nHookCount>1){ 2;Z 0pPR&  
  nHookCount--; r?DCR\Jq  
  return TRUE; $z$^ yjL  
 } $@Vn+| Ix  
 BOOL unhooked = UnhookWindowsHookEx(hHook); cSPQ NYU:  
 if(unhooked==TRUE){ FJ0I&FyWs  
  nHookCount=0; KYiJXE[Q-  
  hHook=NULL; EDnNS  
 } z6`0Uv~  
 return unhooked; &2W"4SE]6  
} V?EX`2S  
mu\1hKq;B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) UwUHB~<oE  
{ Zn9u&!T&  
 BOOL bAdded=FALSE; gKb,Vrt  
 for(int index=0;index<MAX_KEY;index++){ X.<3 /  
  if(hCallWnd[index]==0){ f"7MYw\  
   hCallWnd[index]=hWnd; f\R_a/Us  
   HotKey[index]=cKey; PMsb"=Ds  
   HotKeyMask[index]=cMask; /si<Fp)z  
   bAdded=TRUE; #Vum  
   KeyCount++; utmJ>GWSI  
   break; GFFwk4n1  
  } 3jZGO9ttnS  
 } {~9zuNi  
 return bAdded; $NR[U+  
} :)lS9<Y}  
]T)N{"&N/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) HO<|EH~lu  
{ I(M/ X/  
 BOOL bRemoved=FALSE; kN/YnY*J<  
 for(int index=0;index<MAX_KEY;index++){ .2%t3ul[  
  if(hCallWnd[index]==hWnd){ =AO (  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IR${a)  
    hCallWnd[index]=NULL; aL:|Dr3SX  
    HotKey[index]=0; D?dBm  
    HotKeyMask[index]=0; !H\;X`W|~D  
    bRemoved=TRUE; 1 iox0  
    KeyCount--; 3@" :&  
    break; M-t 9M~  
   } ,P9F*;Dj  
  } lrJV"H  
 } Pm%xX~H  
 return bRemoved; fnq 3ic"V  
} ZiZ@3O6  
3t<a3"{9  
void VerifyWindow() ]$ d ;P  
{ ~HIj+kN  
 for(int i=0;i<MAX_KEY;i++){ 1Le8W)J  
  if(hCallWnd!=NULL){ gnH {_  
   if(!IsWindow(hCallWnd)){ VzXVy)d  
    hCallWnd=NULL; 4FzTf7h^  
    HotKey=0; 9D14/9*(dU  
    HotKeyMask=0; ~Eg]Auk7  
    KeyCount--; E_~e/y"-  
   } K~d'*J-  
  } XYvj3+  
 } anSZWQ  
} __b4dv  
$1ovT8  
BOOL CHookApp::InitInstance() Md4Q.8  
{ ?EC\ .{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;~0q23{+;U  
 hins=AfxGetInstanceHandle(); (9`dLw5  
 InitHotkey(); *IOrv)  
 return CWinApp::InitInstance(); |? V7E\S  
} W(]A^C=/  
LM eI[Ji  
int CHookApp::ExitInstance() ^mL X}E]  
{ rCF=m]1zxT  
 VerifyWindow(); g)6>=Qo`8E  
 UnInit(); (kR NqfX  
 return CWinApp::ExitInstance(); \0 ~?i6o  
} rf=l1GW  
<P#BQt f  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [y8(v ~H  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3: GwX4yW  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ f$FO 1B)  
#if _MSC_VER > 1000 ~R[ k^i.Y  
#pragma once l)\Q~^cxd  
#endif // _MSC_VER > 1000 {_b2!!p  
+d#8/S*  
class CCaptureDlg : public CDialog IM1&g7Qs2  
{ =Fc]mcJ69  
 // Construction [\3ZMH *  
 public: >/74u/&  
  BOOL bTray; rA ={;`  
  BOOL bRegistered; xS UpVK  
  BOOL RegisterHotkey(); A5j? Yts  
  UCHAR cKey; J&j5@  
  UCHAR cMask; by+xK~>  
  void DeleteIcon(); LilK6K  
  void AddIcon(); B:X%k/{  
  UINT nCount; hV~M!vFxA  
  void SaveBmp(); sg=G<50i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor xxs +=.2  
  // Dialog Data %l8!p'a  
  //{{AFX_DATA(CCaptureDlg) LBq2({="  
  enum { IDD = IDD_CAPTURE_DIALOG }; ftpPrtaP  
  CComboBox m_Key; a+HK fK  
  BOOL m_bControl; ~IYR&GEaUG  
  BOOL m_bAlt; {XIpH r  
  BOOL m_bShift; *` mxv0w~(  
  CString m_Path; q6pHL  
  CString m_Number; Ye]K 74M.  
  //}}AFX_DATA lD0a<L 3  
  // ClassWizard generated virtual function overrides !D F~]&  
  //{{AFX_VIRTUAL(CCaptureDlg) 6fw7\u  
 public: C!:Lk,Z  
  virtual BOOL PreTranslateMessage(MSG* pMsg); =COQv=GT  
 protected: qv(3qY  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d-b<_k{p  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :@)R@. -  
  //}}AFX_VIRTUAL 2T}>9X  
  // Implementation eyh}O  
 protected: 0rL.~2)V  
  HICON m_hIcon; Lxv;[2XsW)  
  // Generated message map functions JkN*hm?  
  //{{AFX_MSG(CCaptureDlg) r-YJ$/J  
  virtual BOOL OnInitDialog(); D7nK"]HG;l  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7zx xO|p[  
  afx_msg void OnPaint(); c BqbbZyUk  
  afx_msg HCURSOR OnQueryDragIcon(); U\Y0v.11  
  virtual void OnCancel(); L+G0/G}O\  
  afx_msg void OnAbout();  OLIMgc(W  
  afx_msg void OnBrowse(); 842v^ 2  
  afx_msg void OnChange(); QDW,e]A  
 //}}AFX_MSG TgjjwcO Y  
 DECLARE_MESSAGE_MAP() Q3%]  
}; k={1zl ;  
#endif sCw>J#@2>  
UF^[?M =  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file EVLL,x.~:z  
#include "stdafx.h" w0;4O)H$O  
#include "Capture.h" 7[P-;8)tq  
#include "CaptureDlg.h" N {{MMIq  
#include <windowsx.h> 0^tY|(b3/M  
#pragma comment(lib,"hook.lib") E`.hM}h  
#ifdef _DEBUG D N)o|p  
#define new DEBUG_NEW Xg]Cq"RJC  
#undef THIS_FILE Rd7U5MBEF  
static char THIS_FILE[] = __FILE__; lx4p Tw1  
#endif eI"pRH*f  
#define IDM_SHELL WM_USER+1 9]Ue%%vM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h STcL:b   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _cJ)v/]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; N$Ad9W?T  
class CAboutDlg : public CDialog 5.ab/uk;M  
{ @:RoYvk$  
 public: Dqo#+_v  
  CAboutDlg(); X+sKG5nS  
  // Dialog Data m5 sW68  
  //{{AFX_DATA(CAboutDlg)  ?;v\wx  
  enum { IDD = IDD_ABOUTBOX }; ?o.d FKUe  
  //}}AFX_DATA oh:9v+  
  // ClassWizard generated virtual function overrides %\,9S`0  
  //{{AFX_VIRTUAL(CAboutDlg) _BA; H+M  
 protected: LI@BB:)[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #8M?y*<I  
  //}}AFX_VIRTUAL  :QP1!  
  // Implementation yYGs] +  
 protected: $ c-O+~  
  //{{AFX_MSG(CAboutDlg) z/"*-+j  
  //}}AFX_MSG WPsfl8@D  
  DECLARE_MESSAGE_MAP() Bk3\NPa  
}; n= 4  
FS=yc.Q_  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) xi{ r-D8Z  
{ `B"sy8}x  
 //{{AFX_DATA_INIT(CAboutDlg) "~r)_Ko  
 //}}AFX_DATA_INIT , d $"`W2  
} &-qQF`7  
m W>Iib|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >v, si].  
{ pl3ap(/  
 CDialog::DoDataExchange(pDX); $adZ|Q\  
 //{{AFX_DATA_MAP(CAboutDlg) B(1-u!pz  
 //}}AFX_DATA_MAP O6/ vFEB  
} O!nS3%De  
`XH0S`B  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Z" ;q w  
 //{{AFX_MSG_MAP(CAboutDlg) G3:!]}  
 // No message handlers OFtf)cGE  
 //}}AFX_MSG_MAP 8Yk*$RR9  
END_MESSAGE_MAP() U!-Nx9  
7^#f)Vp  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) NjZ~b/  
: CDialog(CCaptureDlg::IDD, pParent) ^wWbW&<Tg  
{ OWwqCPz.  
 //{{AFX_DATA_INIT(CCaptureDlg) 2<B'PR-??y  
  m_bControl = FALSE; C`t @tgT  
  m_bAlt = FALSE; OS; T;  
  m_bShift = FALSE; @ :Zk,   
  m_Path = _T("c:\\"); P~{8L.w!>W  
  m_Number = _T("0 picture captured."); }NyQ<,+mq&  
  nCount=0; u$^tRz9  
  bRegistered=FALSE; WN=0s  
  bTray=FALSE; 0D2I)E72o  
 //}}AFX_DATA_INIT Dh8'og)7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 siI%6Gn;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p,8~)ic_  
} >nSt<e  
+Mijio  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ou-UR5  
{ I[k"I(  
 CDialog::DoDataExchange(pDX); :!g|pd[{ag  
 //{{AFX_DATA_MAP(CCaptureDlg) v =y 2  
  DDX_Control(pDX, IDC_KEY, m_Key); ;DK%!."%  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ko[w#j  
  DDX_Check(pDX, IDC_ALT, m_bAlt); & V>rq'~;  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); M{5AQzvs  
  DDX_Text(pDX, IDC_PATH, m_Path); ~x8nC%qPvq  
  DDX_Text(pDX, IDC_NUMBER, m_Number); pAatv;Ex  
 //}}AFX_DATA_MAP uEJ8Lmi  
} #PD6LO  
<9ucpV  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) o5a=>|?p>  
//{{AFX_MSG_MAP(CCaptureDlg) 7xeqs q  
 ON_WM_SYSCOMMAND() YS^!'IyG/B  
 ON_WM_PAINT() O_1[KiZ  
 ON_WM_QUERYDRAGICON() X8ap   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b v_ UroTr  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) j~{cT/5Y_  
 ON_BN_CLICKED(ID_CHANGE, OnChange) h97#(_wV>  
//}}AFX_MSG_MAP 6qZ\^ U  
END_MESSAGE_MAP() A811VL^  
ErNYiYLi]  
BOOL CCaptureDlg::OnInitDialog() 4{kH;~ z$  
{ ~i;{+j6Ho!  
 CDialog::OnInitDialog(); ?'P}ZC8P  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <r: AJ;  
 ASSERT(IDM_ABOUTBOX < 0xF000); B%;MGb o  
 CMenu* pSysMenu = GetSystemMenu(FALSE); c$V5E t  
 if (pSysMenu != NULL) Zw9;g+9  
 { =|P &G~]  
  CString strAboutMenu; [o#% Eg;  
  strAboutMenu.LoadString(IDS_ABOUTBOX); i$E [@  
  if (!strAboutMenu.IsEmpty()) T3P9  
  { * HKu%g  
   pSysMenu->AppendMenu(MF_SEPARATOR);  %nY\"  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Pt"H_SW~k  
  } 'M>m$cCMZ  
 } aq$ hE-{28  
 SetIcon(m_hIcon, TRUE); // Set big icon =lJ ?yuc  
 SetIcon(m_hIcon, FALSE); // Set small icon "wOfs$w%s  
 m_Key.SetCurSel(0); 4`#Q  
 RegisterHotkey(); uem-fTG  
 CMenu* pMenu=GetSystemMenu(FALSE); DSz[,AaR]  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7tcadXk0  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); -Ty~lZ)TDT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); !} TsFa  
 return TRUE; // return TRUE unless you set the focus to a control kh0cJE\_^  
} 4uIYX  
'vBZh1`p  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $].htm  
{ D|9+:Y  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) *(Dmd$|0|  
 { PoF3fy%.  
  CAboutDlg dlgAbout; <R$ 2x_  
  dlgAbout.DoModal(); N;|^C{uz  
 } sWYnoRxu  
 else TsTc3  
 { b4_0XmL  
  CDialog::OnSysCommand(nID, lParam); w2nReB z  
 } \2s`mCY  
} [Iks8ZWr_  
"O jAhKfG  
void CCaptureDlg::OnPaint() tON>wmN  
{ sFFQ]ST2p  
 if (IsIconic()) |EE1S{!24m  
 { 6^Wep- $  
  CPaintDC dc(this); // device context for painting 2cYBm^o|x  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); i 6G40!G=)  
  // Center icon in client rectangle _!',%  +  
  int cxIcon = GetSystemMetrics(SM_CXICON); YqX$a~  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4 ThFC  
  CRect rect; f,HUr% @  
  GetClientRect(&rect); sApix=Lr  
  int x = (rect.Width() - cxIcon + 1) / 2; , Z"<-%3  
  int y = (rect.Height() - cyIcon + 1) / 2; EG>?>K_D  
  // Draw the icon !?>V^#c  
  dc.DrawIcon(x, y, m_hIcon); EraGG"+  
 } dgw.OXa  
 else QadguV6|  
 { Ym6d'd<9(  
  CDialog::OnPaint(); {.:$F3T  
 } $6"(t=%{  
} /d3Jd .l!  
OT{"C"%5t  
HCURSOR CCaptureDlg::OnQueryDragIcon() *1dDs^D#|  
{ ~sk p}g]  
 return (HCURSOR) m_hIcon; v=N?(6T  
} GDxv2^4  
=j,WQ66r3  
void CCaptureDlg::OnCancel() F[jE#M=k  
{ ,L/x\_28  
 if(bTray) |u&cN-}C d  
  DeleteIcon(); (9'^T.J  
  CDialog::OnCancel(); 7N9NeSH  
} sAkr-x?+M  
J$3g3%t  
void CCaptureDlg::OnAbout() CZ5\Et6r  
{ %T/@/,7h  
 CAboutDlg dlg; ]O x5F@  
 dlg.DoModal(); s6bsVAO>  
} bHwEd%f  
m^_=^z+  
void CCaptureDlg::OnBrowse() Jxe+LG  
{ T D _@0Rd  
 CString str;  z:,PwLU  
 BROWSEINFO bi; Zzlf1#26\  
 char name[MAX_PATH]; ~ nsb  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); L)sgW(@2  
 bi.hwndOwner=GetSafeHwnd(); [qYr~:`-[  
 bi.pszDisplayName=name; wX,V:QE  
 bi.lpszTitle="Select folder"; <g[z jV9p  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %nZl`<M  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z?axrGmg0  
 if(idl==NULL) hS]w A"\87  
  return; ~G!JqdKJ0  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); YlHP:ZW-cu  
 str.ReleaseBuffer(); WK>F0xMs1  
 m_Path=str; A lU^ ,X  
 if(str.GetAt(str.GetLength()-1)!='\\') " 9Gn/-V>  
  m_Path+="\\"; fvkcJwkc  
 UpdateData(FALSE); Mbi]EZ  
} *T5;d h (  
P$)g=/td1  
void CCaptureDlg::SaveBmp() = S&`~+  
{ C?<pD+]b_  
 CDC dc; Q.mJ7T~T  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); f O*jCl  
 CBitmap bm; q-F K=r 5  
 int Width=GetSystemMetrics(SM_CXSCREEN); 4qQ,1&!]S  
 int Height=GetSystemMetrics(SM_CYSCREEN); d!,t_jM0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); <L &EH@T  
 CDC tdc; * DL7p8  
 tdc.CreateCompatibleDC(&dc); ScPVjqG2{  
 CBitmap*pOld=tdc.SelectObject(&bm); v,KKn\X  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4-(kk0]`z  
 tdc.SelectObject(pOld); ~66xO9s  
 BITMAP btm; m#7(<#  
 bm.GetBitmap(&btm); >Fel) a  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; </h^%mnd  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >L7s[vKn  
 BITMAPINFOHEADER bih; ^J'_CA  
 bih.biBitCount=btm.bmBitsPixel; / ;]5X  
 bih.biClrImportant=0; ht3.e[%'b  
 bih.biClrUsed=0; (`P\nnb  
 bih.biCompression=0; lPTx] =G  
 bih.biHeight=btm.bmHeight; yeo&Qz2vU  
 bih.biPlanes=1; P?54"$b  
 bih.biSize=sizeof(BITMAPINFOHEADER); c`a(  
 bih.biSizeImage=size; G.W !   
 bih.biWidth=btm.bmWidth; 8t-GsjHb  
 bih.biXPelsPerMeter=0; ',+yD9 @  
 bih.biYPelsPerMeter=0; BrV{X&>[i  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Z~5) )5Ye;  
 static int filecount=0; &.?XntI9O  
 CString name; m~=~DMj  
 name.Format("pict%04d.bmp",filecount++); $<}c[Nm  
 name=m_Path+name; #~u0R>=  
 BITMAPFILEHEADER bfh; LFp "Waiv  
 bfh.bfReserved1=bfh.bfReserved2=0; o5 L^  
 bfh.bfType=((WORD)('M'<< 8)|'B'); F@w; .e!  
 bfh.bfSize=54+size; NTg@UT <  
 bfh.bfOffBits=54; IrLGAQ0  
 CFile bf; qL(Q1O!  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ RZ".?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zZ5:)YiW-  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ep0,4!#FAO  
  bf.WriteHuge(lpData,size); !IxO''4  
  bf.Close(); NxT"A)u  
  nCount++; [|}IS@  
 } C* 7/iRe  
 GlobalFreePtr(lpData); {z#2gc'Q  
 if(nCount==1) #/)t]&n  
  m_Number.Format("%d picture captured.",nCount); C8N)!5(A  
 else 1yy?1&88S  
  m_Number.Format("%d pictures captured.",nCount); i|YS>Pw~j  
  UpdateData(FALSE); /ZLY@&M  
} &d#R'Z  
gYpMwC{*d  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Ui{%q @  
{ v3tJtb^'!  
 if(pMsg -> message == WM_KEYDOWN) f:T?oR>2  
 { % RSZ.  
  if(pMsg -> wParam == VK_ESCAPE) <n"BPXF~  
   return TRUE; D #ddx  
  if(pMsg -> wParam == VK_RETURN) QLA.;`HIE  
   return TRUE; bz>X~   
 } cr7MvXF-  
 return CDialog::PreTranslateMessage(pMsg); $vO&C6m$  
} {Kz,_bo  
-%K!Ra\W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) e#eVc'=cDR  
{ x&}]8S)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *GP2>oEM  
  SaveBmp(); jG5HW*>k0  
  return FALSE; nB[-KS  
} ~(5r+Z}*`  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ k9|5TLXq?  
 CMenu pop; 0D X_ *f  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); .6B\fr.za  
 CMenu*pMenu=pop.GetSubMenu(0); <g4}7l8  
 pMenu->SetDefaultItem(ID_EXITICON); .R9Z$Kbq  
 CPoint pt; e|~MJu+1  
 GetCursorPos(&pt); XR5KJl  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Xlo7enzY  
 if(id==ID_EXITICON) wb-yAQ8  
  DeleteIcon(); 7*/{m K)  
 else if(id==ID_EXIT) zM0NRERi  
  OnCancel(); I<SgKva;c  
 return FALSE; k$EVr([  
} K|& f5w  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Z6jEj9?O  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Mf}M/Fh  
 AddIcon(); wBPo{  
 return res; ITu19WG  
} YFKE>+  
9 _d2u#  
void CCaptureDlg::AddIcon() }x8!{Y#cF  
{ 1+o]+Jz|  
 NOTIFYICONDATA data; 3>,}N9P-v  
 data.cbSize=sizeof(NOTIFYICONDATA); IRdt:B|@  
 CString tip; jvT'N@  
 tip.LoadString(IDS_ICONTIP); _KT!OYH  
 data.hIcon=GetIcon(0); boh?Xt-$  
 data.hWnd=GetSafeHwnd(); l,ENMKA^D  
 strcpy(data.szTip,tip); sdu?#O+c1  
 data.uCallbackMessage=IDM_SHELL; }`"`VLh  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; W&z jb>0b0  
 data.uID=98; xQy,1f3s+  
 Shell_NotifyIcon(NIM_ADD,&data); tAX* CMW  
 ShowWindow(SW_HIDE); rS8a/d~;0  
 bTray=TRUE; &)eg3P)7  
} 8v:{BHX  
?RRO  
void CCaptureDlg::DeleteIcon() 8~=*\ @^  
{ y(A' *G9  
 NOTIFYICONDATA data; "4j~2{{ F  
 data.cbSize=sizeof(NOTIFYICONDATA); @@EI=\  
 data.hWnd=GetSafeHwnd(); gcLz}84  
 data.uID=98; 4s\spvJ  
 Shell_NotifyIcon(NIM_DELETE,&data); yDWIflP0;  
 ShowWindow(SW_SHOW); ]B8 A  
 SetForegroundWindow(); 3v* ~CQy9  
 ShowWindow(SW_SHOWNORMAL); \P\Z<z7jy  
 bTray=FALSE; ;*K4{wvG  
} R>' %}|v/  
_k-_&PR  
void CCaptureDlg::OnChange() "kg`TJf=  
{ 7#8Gn=g  
 RegisterHotkey(); Z`Yt~{,Q  
} pwUXM?$R  
eH&F gmU  
BOOL CCaptureDlg::RegisterHotkey() `-NK:;^  
{ GW2\YU^{  
 UpdateData(); yMs!6c*  
 UCHAR mask=0; S0$^|/Sr  
 UCHAR key=0; Sb.8d]DW  
 if(m_bControl) :t?B)  
  mask|=4; }r}*=;Ea  
 if(m_bAlt) ZWs   
  mask|=2; V35Vi6*p  
 if(m_bShift) &H(yLd[  
  mask|=1; I[z:;4W}L^  
  key=Key_Table[m_Key.GetCurSel()];  Et>#&Nw8  
 if(bRegistered){ qT O6I5u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Z\0Rw>#  
  bRegistered=FALSE; 7]{g^g.9-  
 } *4,Q9K_  
 cMask=mask; #h5:b`fDF  
 cKey=key; K!|eN_1A  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); bMH~vR  
 return bRegistered; $-4](br|  
} De$AJl  
"W<Y1$Y=Y  
  四、小结 'uPAG;)m  
XN<SKW(H3  
  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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