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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: Om  
  895 7$g  
  一、实现方法 3Y-v1.^j  
p#d UL9  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ^Q>*f/.KN  
;%<4U^2  
#pragma data_seg("shareddata") ([*t.  
HHOOK hHook =NULL; //钩子句柄 DeA'D|  
UINT nHookCount =0; //挂接的程序数目 @E2nF|N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 .}N^AO=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 EC'bgFe  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \T9UbkR  
static int KeyCount =0; .M2&ad :  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ?8@*q6~8  
#pragma data_seg() j*4S]!  
AFTed?(  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 v s|6w w  
%}X MhWn{  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ?w/nZQWi  
qk,y|7 p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR acY[?L_6J  
cKey,UCHAR cMask) H$amt^|zQ4  
{ OeGuq.> w  
 BOOL bAdded=FALSE; R"gm]SQ/  
 for(int index=0;index<MAX_KEY;index++){ tcEf ~|3  
  if(hCallWnd[index]==0){ lMez!qx,=  
   hCallWnd[index]=hWnd; Y&f[2+?2NK  
   HotKey[index]=cKey; cGta4;  
   HotKeyMask[index]=cMask; L"7` \4  
   bAdded=TRUE; r/sRXM:3cZ  
   KeyCount++; !a(qqZ|s  
   break;  jnzz~:  
  } */dh_P<Yj  
 } ' 5 qL  
 return bAdded; rqe_zyc&  
} 50bP&dj&  
//删除热键 s*/ G- lY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ":#x\;  
{ {_ho!OS>  
 BOOL bRemoved=FALSE; I+?$4SC  
 for(int index=0;index<MAX_KEY;index++){ nQ!#G(_nO  
  if(hCallWnd[index]==hWnd){ -sH.yAvC6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A;j$rGx  
    hCallWnd[index]=NULL; i -s?"Fk  
    HotKey[index]=0; "jJdUFN  
    HotKeyMask[index]=0; `pAp[]SfQd  
    bRemoved=TRUE; ?Gv!d  
    KeyCount--; oy2dA  
    break; ~K#_'Ldrd  
   } YSz$` 7i  
  } NT9- j#V  
 } *o\Y~U-so  
 return bRemoved; GlgORy=>  
} h:Mn$VR,  
e9hVX[uq  
h-+a;![  
  DLL中的钩子函数如下: 3g#=sd!0O@  
VDu .L8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) l)rvh#D  
{ ;/^]|  
 BOOL bProcessed=FALSE; 7- 3N  
 if(HC_ACTION==nCode) ;0Ct\[eh  
 { nK%/tdq  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 %)hIpxOrX  
   switch(wParam) ':2*+  
   {  0m YZ7S5g  
    case VK_MENU: "K$Wh1<7  
     MaskBits&=~ALTBIT; ~)m t&   
     break; JU=\]E@8c  
    case VK_CONTROL: 0@e}hv;  
     MaskBits&=~CTRLBIT; 60~>f)vu  
     break; v!{'23`87  
    case VK_SHIFT: vD)A)  
     MaskBits&=~SHIFTBIT; D.&eM4MZ  
     break; vu'!-K=0  
    default: //judge the key and send message >gZk 581/  
     break; rb}wv16?  
   } kSDa\l!W]  
   for(int index=0;index<MAX_KEY;index++){ p`<e~[]a  
    if(hCallWnd[index]==NULL) z Jo#3  
     continue; ?m9UhLeaS=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z/6'kE{l  
    { 9p\wTzA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #SihedWi  
     bProcessed=TRUE; o~.o^0Y  
    } n"<GJ.{  
   } [,o5QH\Etq  
  } ;/)Mcx]n  
  else if((lParam&0xc000ffff)==1){ //有键按下  fBWJ%W  
   switch(wParam) 6PQJgki  
   { |!xfIR>=F  
    case VK_MENU: =4M.QA@lI!  
     MaskBits|=ALTBIT; v1"g!%U6  
     break; THbtu*El  
    case VK_CONTROL: {Z?$Co^R  
     MaskBits|=CTRLBIT; ll<9f)  
     break; 8W1K3[Jj<  
    case VK_SHIFT: hV>4D&<  
     MaskBits|=SHIFTBIT; .X LV:6  
     break; ><#2O  
    default: //judge the key and send message SP D207  
     break; lEyG9Xvi  
   } FUzMc1zy|  
   for(int index=0;index<MAX_KEY;index++){ Q0L@.`~  
    if(hCallWnd[index]==NULL) 03k?:D+5  
     continue;  |t))u`~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5{K}?*3hJ  
    { o:"anHs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lwT9~Hyp  
     bProcessed=TRUE; &fwS{n;U  
    } Ts9ktPlm  
   } Dzl;-]S  
  } N>|XS ,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 PE"v*9k  
   for(int index=0;index<MAX_KEY;index++){ x({H{'9?  
    if(hCallWnd[index]==NULL) ('C7=u&F  
     continue; wJeG(h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ['q&@_d7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QJn`WSw$_-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ibpzeuUl  
   } 9MY7a=5E~  
  } kM/Te{<  
 } ?kTWpXx"=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); JWv{=_2w  
} 6G AaV[])'  
nXA\|c0  
  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=Ym x2A9]  
?wb+L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k |YWOy@D~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); amWD-0V  
$w#r"= )  
  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: $HJTj29/  
]Mi.f3QlO6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) EH*o"N`!r  
{ ememce,Np  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) b'YE9E  
 { !#2=\LUC  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 T?Fcohz(  
  SaveBmp(); G:W>I=^DaR  
  return FALSE; Oakb'  
 } _>m-AI4^  
 …… //其它处理及默认处理 &HW1mNF9  
} hm*cw[#O1x  
\x{;U#B[3>  
O81X ;JdP3  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 +rXF{@ l  
Ih}1%Jq  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Kl{>jr8B3  
uX/$CM  
  二、编程步骤 |RkcDrB~  
>EsziRm  
  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"; ;Q;[*B=kE  
LhXUm  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; lv&mp0V+  
Yap?^&GV  
  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; 4+$b~ u  
N==ZtKj F  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; |{r$jZeE  
-|k)tvAm  
  5、 添加代码,编译运行程序。 '_\;jFAM  
Y9=K]GB  
三、程序代码 K,'*Dz  
`;|5  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL }v9\F-0>Q  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .nu @ o40  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ E/&Rb*3  
#if _MSC_VER > 1000 '>$EOg"  
#pragma once Rlnbdb;!k  
#endif // _MSC_VER > 1000 0P^L}VVX  
#ifndef __AFXWIN_H__ n<sd!xmqFx  
#error include 'stdafx.h' before including this file for PCH Pi,QHb`>  
#endif *L6PLe  
#include "resource.h" // main symbols UJfT!==U  
class CHookApp : public CWinApp H1GRMDNXOA  
{ }G o$ \Bk  
 public: !Cgx.   
  CHookApp(); -K,-h[ o  
  // Overrides CQ`=V2:"ON  
  // ClassWizard generated virtual function overrides 2sNK  
  //{{AFX_VIRTUAL(CHookApp) =S'%`]f?  
 public: <IW#ME  
  virtual BOOL InitInstance(); IK,|5]*Ar  
  virtual int ExitInstance(); "mL++>ZSQ  
  //}}AFX_VIRTUAL 21s4MagC  
  //{{AFX_MSG(CHookApp) alh >"9~!  
  // NOTE - the ClassWizard will add and remove member functions here. QB.J,o*XD4  
  // DO NOT EDIT what you see in these blocks of generated code ! CT0l!J~5m~  
  //}}AFX_MSG />'V!iWyz  
  DECLARE_MESSAGE_MAP() %ms'n  
}; }$MN|s  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); L %ip>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _&K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  Qk!;M |  
BOOL InitHotkey(); PH"hn]  
BOOL UnInit(); *Av"JAX  
#endif m9U"[Huv1E  
@ '@:sM_  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. {G <kA(Lm  
#include "stdafx.h" 6v,z@!b  
#include "hook.h" nJPyM/p  
#include <windowsx.h> 2G$SpfeIu  
#ifdef _DEBUG m<L;  
#define new DEBUG_NEW +<,gB $j  
#undef THIS_FILE Ii7QJ:^  
static char THIS_FILE[] = __FILE__; 1c JF/"v  
#endif omWJJ|b~  
#define MAX_KEY 100 eEhr140  
#define CTRLBIT 0x04 7~#:>OjW  
#define ALTBIT 0x02 Ax!+P\\2~  
#define SHIFTBIT 0x01 f+rz|(6vs{  
#pragma data_seg("shareddata") n G_6oe*=I  
HHOOK hHook =NULL; /1?R?N2>0  
UINT nHookCount =0; ng:Q1Q9N  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey R/"x}B1d  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT $gBd <N9|c  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey JG{j)O|L  
static int KeyCount =0; 4v[~r1!V  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift CK, 6ytB  
#pragma data_seg() =^ T\Xs;GK  
HINSTANCE hins; r J KZ)N{  
void VerifyWindow(); PRNoqi3sY  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) E( us'9c   
//{{AFX_MSG_MAP(CHookApp) 0Z{j>=$  
// NOTE - the ClassWizard will add and remove mapping macros here. Mi~(aah  
// DO NOT EDIT what you see in these blocks of generated code! 5U_H>oD  
//}}AFX_MSG_MAP fO#vF.k%  
END_MESSAGE_MAP() "`6n6r42  
gWY "w!f  
CHookApp::CHookApp() tGB@$UmfU  
{ I(=V}s2  
 // TODO: add construction code here, /c):}PJ^#7  
 // Place all significant initialization in InitInstance Z,iHy3`  
} jY_T/233d  
wcDRH)AW.  
CHookApp theApp; u^029sH6j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) q&:=<+2"  
{ y\{%\$  
 BOOL bProcessed=FALSE; MQin"\  
 if(HC_ACTION==nCode) Ecs,$\  
 { %4HRW;IU  
  if((lParam&0xc0000000)==0xc0000000){// Key up 3]?#he  
   switch(wParam) Ytgj|@jsp  
   { | >z3E z  
    case VK_MENU: ?ve#} \  
     MaskBits&=~ALTBIT; b%cF  
     break; ws^4?O  
    case VK_CONTROL: trE{FT  
     MaskBits&=~CTRLBIT; <]G]W/eB'  
     break; }`+B=h-dW  
    case VK_SHIFT: 7=(Hy\Q5xH  
     MaskBits&=~SHIFTBIT; n("0%@ov  
     break; s=[h?kB  
    default: //judge the key and send message 10H)^p%3+  
     break; qTQBt}  
   } )Pv9_XKJ  
   for(int index=0;index<MAX_KEY;index++){ 4V~?.  
    if(hCallWnd[index]==NULL) NzNA>[$[  
     continue; r [ K5w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) '}Ri`  
    { O(_[ayE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \}]!)}G  
     bProcessed=TRUE; f|sFlUu&  
    } >$2V%};  
   } yeHDa+}  
  } |<O9Sb_  
  else if((lParam&0xc000ffff)==1){ //Key down <jed!x  
   switch(wParam) fNrgdfo  
   { _/O25% l  
    case VK_MENU: $HJwb-I  
     MaskBits|=ALTBIT; /q5:p`4{J  
     break; : >>@rF ,  
    case VK_CONTROL: MQ"xOcD*F  
     MaskBits|=CTRLBIT; Zv#Ll@v  
     break; *E{2J:`  
    case VK_SHIFT: !>1@HH?I\/  
     MaskBits|=SHIFTBIT; HF(KN{0.B  
     break; k?'B*L_Mzv  
    default: //judge the key and send message 5ls6t{Ci  
     break; '} $Dgp6e  
   } ) Yd?m0m*  
   for(int index=0;index<MAX_KEY;index++) a1@Y3M Q;i  
   { |DsnNk0c  
    if(hCallWnd[index]==NULL) >;[*!<pfK5  
     continue; l]5w$dded~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &?(?vDFfZ  
    { /E\%>wv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); RU\/j%^  
     bProcessed=TRUE; 4]E3c AJ  
    } KRA/MQ^7~U  
   } f`Fi#EKT  
  } Bi{$@n&?f  
  if(!bProcessed){ Sm5H_m!  
   for(int index=0;index<MAX_KEY;index++){ ~sXcnxLz  
    if(hCallWnd[index]==NULL) V 0rZz  
     continue;  E@b(1@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) d m`E!R_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); q*9!,!e  
   } xKho1Z  
  } ^N)R=tl  
 } g pOC`=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -jiG7OL  
} _FWBUZ;N  
>m$ 1+30X  
BOOL InitHotkey() qXwPDq/  
{ 8#g1P4  
 if(hHook!=NULL){ a8UwhjFO  
  nHookCount++; \:UIc*S  
  return TRUE; ;4pYK@9w_  
 } >o=-$gz`  
 else lx7Q.su'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); @8I4[TE  
  if(hHook!=NULL) ] @u6HH~^  
   nHookCount++; w}YlVete  
  return (hHook!=NULL); K>@+m  
} 9'X7w G  
BOOL UnInit() \}|o1Xh2  
{ ZG&>:Si;  
 if(nHookCount>1){ 7](KV"%V  
  nHookCount--; mUik A9u5=  
  return TRUE; $[a8$VY^Cm  
 } XcUwr  
 BOOL unhooked = UnhookWindowsHookEx(hHook); j=r P:#  
 if(unhooked==TRUE){ '?p<lu^^B  
  nHookCount=0; :BV6y|J9O^  
  hHook=NULL; dx@-/^.  
 } %#xaA'? [  
 return unhooked; |}di&y@-JI  
} #ZrHsf P  
4J/}]Dr5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1`qMj0Y_  
{ wMg0>  
 BOOL bAdded=FALSE; =E#%'/ A;c  
 for(int index=0;index<MAX_KEY;index++){ 3!|;iJRH  
  if(hCallWnd[index]==0){ ^Xq 6:  
   hCallWnd[index]=hWnd; x#xFh0CA  
   HotKey[index]=cKey; GQUe!G9  
   HotKeyMask[index]=cMask; {ix?Brq/  
   bAdded=TRUE; SPY|K  
   KeyCount++; '9 [vDG~  
   break; )9"_J9G  
  } ic#`N0s?  
 } E^/t$M|H  
 return bAdded; nz=G lO'[  
} ($;77fPR  
':3 pq2{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 87 $dBb{  
{ 7` zHX&-W  
 BOOL bRemoved=FALSE; %Q fO8P  
 for(int index=0;index<MAX_KEY;index++){ (mTE;s(  
  if(hCallWnd[index]==hWnd){ `tA" }1;ka  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <oT^A|JFj  
    hCallWnd[index]=NULL; vZaZc}AyL  
    HotKey[index]=0; UU;(rS/  
    HotKeyMask[index]=0; WrxP  
    bRemoved=TRUE; :~tAUy":_*  
    KeyCount--; ;Q OBBF3HG  
    break; ;5S9y7[i|  
   } KWowN;  
  } 7XTkX"zKj  
 } Bn#?zI  
 return bRemoved; 6;\I))"[  
} S >X:ZYYC  
v1+3}5b'uF  
void VerifyWindow() 1{ ~#H<K  
{ hKLCJ#T  
 for(int i=0;i<MAX_KEY;i++){ (:TjoXXiY  
  if(hCallWnd!=NULL){ K/j3a[.  
   if(!IsWindow(hCallWnd)){ K1"*.\?F  
    hCallWnd=NULL; )_syZ1j  
    HotKey=0; v &Yi  
    HotKeyMask=0; eTI%^d|  
    KeyCount--; \E72L5nJW  
   }  *'.|9W  
  } A}G7l?V&  
 } LrM=*R h,O  
} _~IR6dKE  
nm5cpnNl  
BOOL CHookApp::InitInstance() ([\  
{ ZRh~`yy  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); \qdHX  
 hins=AfxGetInstanceHandle(); n$x c];j  
 InitHotkey(); l&OKBUG  
 return CWinApp::InitInstance(); ]HKQDc'  
} fi-WZ  
@=bLDTx;c)  
int CHookApp::ExitInstance() "CSsCA$/  
{ |oH,   
 VerifyWindow(); qON|4+~u%  
 UnInit(); r?+%?$  
 return CWinApp::ExitInstance(); gf#{k2r  
} YSr9VpqWV  
[-65PC4aN  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file tvkb~  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6}gls}[0{e  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?{P"O!I{  
#if _MSC_VER > 1000 FOv=!'S o  
#pragma once E ]A#Uy  
#endif // _MSC_VER > 1000 rHC>z7+z.  
Q8:Has  
class CCaptureDlg : public CDialog M>wYD\oeg  
{ k$R~R-'  
 // Construction ;,C)!c&  
 public: j`JMeCG=Ee  
  BOOL bTray; <{dVKf,e  
  BOOL bRegistered; yCd-9zb=  
  BOOL RegisterHotkey(); |'.*K]Yp  
  UCHAR cKey; nno}e/zqf  
  UCHAR cMask; aXQnZ+2e^R  
  void DeleteIcon(); Buf/@B7+\  
  void AddIcon(); :8L8q<U  
  UINT nCount; opY@RJ]  
  void SaveBmp(); 6_J$UBT  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor y~Bh  
  // Dialog Data 3C?f(J}  
  //{{AFX_DATA(CCaptureDlg) lW+\j3?Z$  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;\a YlV-  
  CComboBox m_Key; ]mo-rhDsM  
  BOOL m_bControl; j>*R]mr6  
  BOOL m_bAlt; )_+rU|We  
  BOOL m_bShift; V@B__`y7  
  CString m_Path; G3+.H  
  CString m_Number; O}+.U<V  
  //}}AFX_DATA yWg@v +  
  // ClassWizard generated virtual function overrides =[H;orMr  
  //{{AFX_VIRTUAL(CCaptureDlg) 00G%gQXk,  
 public: h hG4-HD  
  virtual BOOL PreTranslateMessage(MSG* pMsg); dU6ou'p f  
 protected: %b%-Ogz;4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 33o9Yg|J~  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); p6 ]7&{>  
  //}}AFX_VIRTUAL B:dB,3,`(  
  // Implementation qOe+ZAJ{%N  
 protected: w&$`cD  
  HICON m_hIcon; 1%EBd%`#  
  // Generated message map functions )jU)_To  
  //{{AFX_MSG(CCaptureDlg) H(R1o~  
  virtual BOOL OnInitDialog(); 1/RsptN"v  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); W}--p fG  
  afx_msg void OnPaint(); |2?'9<  
  afx_msg HCURSOR OnQueryDragIcon(); NhfJ30~  
  virtual void OnCancel(); DQNnNsP:M-  
  afx_msg void OnAbout(); NV)!7~r}:  
  afx_msg void OnBrowse(); VO,!x~S!  
  afx_msg void OnChange(); u}>#Eb  
 //}}AFX_MSG XxT#X3D/,"  
 DECLARE_MESSAGE_MAP() 6FUw"|\u{  
}; pM^9c7@!:  
#endif [DJflCR&  
d_AK `wR  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file FqkDKTS\&  
#include "stdafx.h" K\>tA)IPSV  
#include "Capture.h" {s)+R[?m<o  
#include "CaptureDlg.h" RSr %n1  
#include <windowsx.h> X'wE7=29M  
#pragma comment(lib,"hook.lib") aiQ>xen5C5  
#ifdef _DEBUG a#^B2  
#define new DEBUG_NEW Scp7X7{N  
#undef THIS_FILE /d0K7F  
static char THIS_FILE[] = __FILE__; j;%-fvd;  
#endif -#0qV:D  
#define IDM_SHELL WM_USER+1 W@T~ly;e*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nnCG g+l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O>qll 6]{@  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; aY3^C q(r  
class CAboutDlg : public CDialog `k OD[*  
{ .EpV;xq}  
 public: UUSq$~Ct  
  CAboutDlg(); E_Im^a  
  // Dialog Data 3Th'paMG  
  //{{AFX_DATA(CAboutDlg) A&s:\3*Kh  
  enum { IDD = IDD_ABOUTBOX }; eKgisY4#  
  //}}AFX_DATA [!!o-9b  
  // ClassWizard generated virtual function overrides O>SLOWgha  
  //{{AFX_VIRTUAL(CAboutDlg) ;+0t;B!V  
 protected: )_1zRT|9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \x)n>{3C  
  //}}AFX_VIRTUAL c05TsMF&O  
  // Implementation ) u3 Zm  
 protected: =NOH:#iQ  
  //{{AFX_MSG(CAboutDlg) q+P|l5_ t  
  //}}AFX_MSG #rxVd 7f  
  DECLARE_MESSAGE_MAP() *j]9vktH  
}; %R@X>2l/_  
;} und*q  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) PH`9MXh  
{ g$HwxA9Gp/  
 //{{AFX_DATA_INIT(CAboutDlg) /3A^I{e74  
 //}}AFX_DATA_INIT d_4T}% q  
} ~3WM5 fv  
zV:pQRbt.  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S?RN?1  
{ lCAIK  
 CDialog::DoDataExchange(pDX); ZaeqOVp/j  
 //{{AFX_DATA_MAP(CAboutDlg) L~(_x"uXd  
 //}}AFX_DATA_MAP K/A*<<r ~  
} SfgU`eF%B  
x 8Retuv  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) XpmS{nb  
 //{{AFX_MSG_MAP(CAboutDlg) >2~+.WePu  
 // No message handlers &n6$rBr %  
 //}}AFX_MSG_MAP C K:y?  
END_MESSAGE_MAP() ObLly%|i  
.jS~By|r  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) s_x:T<]  
: CDialog(CCaptureDlg::IDD, pParent) 1&^MfP}  
{ L!=4N!j  
 //{{AFX_DATA_INIT(CCaptureDlg) P8^hBv*  
  m_bControl = FALSE; '&.#  
  m_bAlt = FALSE; AFc$%\s4  
  m_bShift = FALSE; T32+3wb"I  
  m_Path = _T("c:\\"); _/Gczy4)#  
  m_Number = _T("0 picture captured."); %6L^2 X  
  nCount=0; a["2VY6Eq@  
  bRegistered=FALSE; ]4h92\\965  
  bTray=FALSE; S|apw7C  
 //}}AFX_DATA_INIT Y|8:;u'  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2R=DB`3  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); t]$P1*I  
} f8M$45A'  
|;.o8}  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) I4i2+ *l}  
{ wNQ*t-K  
 CDialog::DoDataExchange(pDX); uHAT#\m:  
 //{{AFX_DATA_MAP(CCaptureDlg) Jd5:{{ Lb  
  DDX_Control(pDX, IDC_KEY, m_Key); sXi=70o  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); )\6&12rj  
  DDX_Check(pDX, IDC_ALT, m_bAlt); K?s+3  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); h3*Zfl<]  
  DDX_Text(pDX, IDC_PATH, m_Path); p"l3e9&'j  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1AG=%F|.  
 //}}AFX_DATA_MAP 9:`(Q3Ei  
} DA2}{  
jy giG&H  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) h~(G$':^  
//{{AFX_MSG_MAP(CCaptureDlg) L]d-hs  
 ON_WM_SYSCOMMAND() t5'V6nv  
 ON_WM_PAINT() Z^]|o<.<I  
 ON_WM_QUERYDRAGICON() wY~&Q}U  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) TF 'U  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) UB 6mqjPK  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]8icBneA~'  
//}}AFX_MSG_MAP s<9RKfm  
END_MESSAGE_MAP() %^1cyk  
Pu"R,a  
BOOL CCaptureDlg::OnInitDialog() &^}6 9  
{ 2RN)<\P  
 CDialog::OnInitDialog(); W D T]!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); jM$`(Y  
 ASSERT(IDM_ABOUTBOX < 0xF000); ^s@8VAwi  
 CMenu* pSysMenu = GetSystemMenu(FALSE); HsnLm67'  
 if (pSysMenu != NULL) 34wkzu  
 { ZTU&, 1Y;  
  CString strAboutMenu; TQ`Rk;0R  
  strAboutMenu.LoadString(IDS_ABOUTBOX); X=Ys<TM,  
  if (!strAboutMenu.IsEmpty()) =QK$0r]c'k  
  { Kx=4~  
   pSysMenu->AppendMenu(MF_SEPARATOR); =egW  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); d3W0-INL  
  } ithewup  
 } /}Lt,9  
 SetIcon(m_hIcon, TRUE); // Set big icon C_4)=#@GU  
 SetIcon(m_hIcon, FALSE); // Set small icon  qNm$Fx  
 m_Key.SetCurSel(0); =xNv\e  
 RegisterHotkey(); .Wq@gV  
 CMenu* pMenu=GetSystemMenu(FALSE); 4'6`Ll|iq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Gg~QAsks   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^':!1  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6gT5O]]#o  
 return TRUE; // return TRUE unless you set the focus to a control {5d9$v7k4  
} +<}0|Xl&  
C=s1R;"H  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) f{"8g"[[)(  
{ 7lS#f1E  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 0b/WpP  
 { @&]#uRl|[  
  CAboutDlg dlgAbout; 0vVV%,v  
  dlgAbout.DoModal(); $8p7D?Y  
 } 8a_[B~  
 else quvanx V-L  
 { N<Q jdD&  
  CDialog::OnSysCommand(nID, lParam); eL4NB$Fb  
 } 25NTIzI@@  
} fZxIY,  
>yXN,5d[  
void CCaptureDlg::OnPaint() [kqYfY?K  
{ F  q!fWl  
 if (IsIconic()) MwfOy@|N  
 { 4J?t_)  
  CPaintDC dc(this); // device context for painting aA'|Rg,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); N`E-+9L)  
  // Center icon in client rectangle McoK@q ;  
  int cxIcon = GetSystemMetrics(SM_CXICON); })w*m  
  int cyIcon = GetSystemMetrics(SM_CYICON); 50 A^bbid  
  CRect rect; VR  
  GetClientRect(&rect); \o\nr!=k  
  int x = (rect.Width() - cxIcon + 1) / 2; -QyhwG =  
  int y = (rect.Height() - cyIcon + 1) / 2; wZ4tCZA  
  // Draw the icon (;%|-{7e-  
  dc.DrawIcon(x, y, m_hIcon); Hg9CZM ko  
 } oG7q_4+&  
 else U xD5eJJ  
 { v4RlLg dS%  
  CDialog::OnPaint(); peJKNX.!q  
 } ^m/14MN|  
} /)xlJUq  
}|B=h  
HCURSOR CCaptureDlg::OnQueryDragIcon() 6{ ,HiY  
{ ( Y+N@d  
 return (HCURSOR) m_hIcon; }n7t h  
} w_ {,<[#  
U$H @ jJ*  
void CCaptureDlg::OnCancel() -dv %H{  
{ Bm\qxQ  
 if(bTray) *_ +7ni  
  DeleteIcon(); -o+74=E8[?  
  CDialog::OnCancel(); 5'w^@Rs5  
} .)|a2d ~F  
/H:I 68~  
void CCaptureDlg::OnAbout() n,~;x@=5  
{ 4wi(?  
 CAboutDlg dlg; Z?J:$of*  
 dlg.DoModal(); aS|wpm)K>8  
} r}u%#G+K,  
+>7$4`Nb2  
void CCaptureDlg::OnBrowse() [!^-J}^g~\  
{ :Vg}V"QR  
 CString str; ecOy6@UDY  
 BROWSEINFO bi; .$", *d  
 char name[MAX_PATH]; #a| L3zR5v  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); w6 2=06`@  
 bi.hwndOwner=GetSafeHwnd(); 7ou46v|m5  
 bi.pszDisplayName=name; kl1Y] ?z}  
 bi.lpszTitle="Select folder"; 44\>gI<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; PN$ .X"D8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); xjdw'v+qZo  
 if(idl==NULL) dSIH9D  
  return; `\<37E\N}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); k:A|'NK~  
 str.ReleaseBuffer(); Q36)7=at  
 m_Path=str; 5j"1z1_&  
 if(str.GetAt(str.GetLength()-1)!='\\') -~)OF  
  m_Path+="\\"; P&*sB%B  
 UpdateData(FALSE); Bn]K+h\E  
} R.j1?\  
? 8 1X  
void CCaptureDlg::SaveBmp() W v!<bT8r  
{ 5 waw`F  
 CDC dc; vMSW$Bx ;  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 5;)*T6Y  
 CBitmap bm; 1xnLB>jP#  
 int Width=GetSystemMetrics(SM_CXSCREEN); YEYY}/YX  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2 Tvvq(?T  
 bm.CreateCompatibleBitmap(&dc,Width,Height); |'HLz=5\  
 CDC tdc; W VkR56  
 tdc.CreateCompatibleDC(&dc); Y9r3XhVI  
 CBitmap*pOld=tdc.SelectObject(&bm); }0=<6\+:`  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); eukA[nO7G  
 tdc.SelectObject(pOld); ,:v&4x&=  
 BITMAP btm; *QE<zt  
 bm.GetBitmap(&btm); S+x_c4 T  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 1M%S gV-#  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E\2Ml@J  
 BITMAPINFOHEADER bih; #y"=Cz=1u7  
 bih.biBitCount=btm.bmBitsPixel; H!IDV }dn  
 bih.biClrImportant=0; CfT/R/L  
 bih.biClrUsed=0; Sm3u/w!  
 bih.biCompression=0; "c`xH@D  
 bih.biHeight=btm.bmHeight; s<T?pH  
 bih.biPlanes=1; ,ul5,ygA  
 bih.biSize=sizeof(BITMAPINFOHEADER); o96:4j4  
 bih.biSizeImage=size; 9\O(n>  
 bih.biWidth=btm.bmWidth; >kYp%r6  
 bih.biXPelsPerMeter=0; A{,n;;  
 bih.biYPelsPerMeter=0; eS!C3xC;J]  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); X} JOX9pK  
 static int filecount=0; (fk5'  
 CString name; XYbyOM VI  
 name.Format("pict%04d.bmp",filecount++); HD# r0)  
 name=m_Path+name; wODvc9p}]  
 BITMAPFILEHEADER bfh; ahIE;Y\j'  
 bfh.bfReserved1=bfh.bfReserved2=0; 2wh#$zGy  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -6EK#!+  
 bfh.bfSize=54+size; IS_Su;w>4  
 bfh.bfOffBits=54; |'hLa  
 CFile bf; Px4/O~bLk  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]EL\)xCr  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); \aSz2lxEHn  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]A:( L9  
  bf.WriteHuge(lpData,size); +g\;bLT  
  bf.Close(); x*8O*!ZZ  
  nCount++; D\rmaF+  
 } INNAYQ  
 GlobalFreePtr(lpData); w7Dt1axB  
 if(nCount==1) IcoowZZ   
  m_Number.Format("%d picture captured.",nCount); .LE+/n  
 else M9"Sgb`g  
  m_Number.Format("%d pictures captured.",nCount); \|+/0 USn  
  UpdateData(FALSE); .hz2&9Ow  
} oX|?:MS:  
nxRwWj57  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 6Y?`=kAp  
{ :EB,{|m  
 if(pMsg -> message == WM_KEYDOWN) {e9Y !oFg  
 { GXeAe}T  
  if(pMsg -> wParam == VK_ESCAPE) x;U|3{I o  
   return TRUE; f-+.;`H)T  
  if(pMsg -> wParam == VK_RETURN) Vipp /WV  
   return TRUE; `p|[rS>  
 } +qE']yzm!  
 return CDialog::PreTranslateMessage(pMsg); 0zV 4`y  
} Zz")`hUG  
lPS*-p#IZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8A/>JD3^  
{ #WEq-0L   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >EBC 2WJ  
  SaveBmp(); x u,htx  
  return FALSE; ay[ZsQC  
} j |td,82.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ }xJR.]).KW  
 CMenu pop; pzSqbgfrQ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); B(Y.`L? %E  
 CMenu*pMenu=pop.GetSubMenu(0); 5mIXyg 0:  
 pMenu->SetDefaultItem(ID_EXITICON); \_>?V5(  
 CPoint pt; `]&*`9IK{  
 GetCursorPos(&pt); V/&o]b   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;+9(;  
 if(id==ID_EXITICON) ^2JPyyZa  
  DeleteIcon(); "OJr*B  
 else if(id==ID_EXIT) ?%;B`2 nDR  
  OnCancel(); >]?Jrs  
 return FALSE; ;_p fwa4  
} WVkG 2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); vnVZJ}]w\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 25&nwz  
 AddIcon(); "cQvd(kug  
 return res; `{L{wJ:&a  
} ,5kvn   
.t :DvB  
void CCaptureDlg::AddIcon() iP,v=pS6  
{ A?' H[2]w"  
 NOTIFYICONDATA data; )^(P@D.L  
 data.cbSize=sizeof(NOTIFYICONDATA); A`Q >h{  
 CString tip; ;YM]K R;  
 tip.LoadString(IDS_ICONTIP); Z !Z,M' "  
 data.hIcon=GetIcon(0); pMDH  
 data.hWnd=GetSafeHwnd(); *LEu=3lp%>  
 strcpy(data.szTip,tip); *@~`d*d  
 data.uCallbackMessage=IDM_SHELL; LhZZc`|7t  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ZGzc"r(r:#  
 data.uID=98; gu!](yEgl  
 Shell_NotifyIcon(NIM_ADD,&data); mDlCt_h  
 ShowWindow(SW_HIDE); 9D%qXU  
 bTray=TRUE; pqOA/^ar  
} MN\i-vAL8  
Z$1.^H.Db  
void CCaptureDlg::DeleteIcon() h&q=I.3O|?  
{ YK7\D:  
 NOTIFYICONDATA data; Xn PJC'  
 data.cbSize=sizeof(NOTIFYICONDATA); <3)|44.o&  
 data.hWnd=GetSafeHwnd(); R !Fx)xj  
 data.uID=98; ,cPkx~w0  
 Shell_NotifyIcon(NIM_DELETE,&data); F:M/z#:~  
 ShowWindow(SW_SHOW); T\)dt?Tv#\  
 SetForegroundWindow(); L!?v BL  
 ShowWindow(SW_SHOWNORMAL); >eEnQ}Y  
 bTray=FALSE; 4v0dd p  
} ~d&'Lp[3  
?ISI[hoc  
void CCaptureDlg::OnChange() U 7EHBW  
{ 4P`PmQ=GQh  
 RegisterHotkey(); eSJAPU(D  
} ZUv ZN f  
D7EXqo  
BOOL CCaptureDlg::RegisterHotkey() =7FE/S  
{ '_k>*trV  
 UpdateData(); -hQ96S8  
 UCHAR mask=0; ;_>s0rUV  
 UCHAR key=0; 7E;>E9 '  
 if(m_bControl) >F,$;y52  
  mask|=4; L-`(!j  
 if(m_bAlt) A J<iM)l|  
  mask|=2; Xs{/}wc.q;  
 if(m_bShift) !&'# a  
  mask|=1; ww-XMz h  
  key=Key_Table[m_Key.GetCurSel()]; @QvfN>T  
 if(bRegistered){ (qNco8QKu3  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %j~9O~-  
  bRegistered=FALSE; C<zx'lw!  
 } 2qt=jz\s  
 cMask=mask; xAR^  
 cKey=key; ac2}3 $u  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); e_YW~z=6t  
 return bRegistered; 2q2p=H>&  
} ;5&k/CB1  
L+v8E/W  
  四、小结 Q,[rrG;?@  
]$*$0  
  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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