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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: FM{^ND9x  
  eyM<#3\\S  
  一、实现方法 S10"yhn(-t  
dWc'RwL  
  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: oRDqN]  
CjFnE   
#pragma data_seg("shareddata") `!BP.-Zv  
HHOOK hHook =NULL; //钩子句柄 FX1[ 2\  
UINT nHookCount =0; //挂接的程序数目 "2l$}G  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 "Zh3,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P8& BtA  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |DUWB;  
static int KeyCount =0; uU$YN-  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #)3luf3G  
#pragma data_seg() '{>R-}o[3  
sej$$m R  
  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。 7uUo DM  
(5rfeSA^  
  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: MUQj7.rNa  
+aY]?]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR X RQz~Py  
cKey,UCHAR cMask) H18.)yHX  
{ LyRbD$m  
 BOOL bAdded=FALSE; ` x|=vu-  
 for(int index=0;index<MAX_KEY;index++){ ;?h+8Z/{  
  if(hCallWnd[index]==0){ K*!qt(D&  
   hCallWnd[index]=hWnd; `;~A  
   HotKey[index]=cKey; QsemN7B "<  
   HotKeyMask[index]=cMask; *F:)S"3_~e  
   bAdded=TRUE; gT-"=AsxZQ  
   KeyCount++; \iP=V3  
   break; NIo!WOi  
  } Uf}u`"$F  
 } }xa~U,#5  
 return bAdded; L'?7~Cdls  
} n0a|GZyO]  
//删除热键 !"d"3coQ?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'w$jVX/  
{ FF5|qCV/z  
 BOOL bRemoved=FALSE; IGnP#@`5]  
 for(int index=0;index<MAX_KEY;index++){ 5eLm  
  if(hCallWnd[index]==hWnd){ n^lr7(!6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ luWr.<1  
    hCallWnd[index]=NULL; urbSprdF  
    HotKey[index]=0; TCWt3\  
    HotKeyMask[index]=0; >%\&tS'  
    bRemoved=TRUE; M*gbA5  
    KeyCount--; drwD3jx0xv  
    break; 6*&$ha}X  
   } F tS"vJ\  
  } m[}@\y  
 } -F$v`|(O+  
 return bRemoved; M\_IQj  
} {j8M78}3  
\[9^,Q P  
# 4&t09  
  DLL中的钩子函数如下: 14pyHMOR  
vojXo|c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) e"(SlR  
{ c5em*qCw$  
 BOOL bProcessed=FALSE; y*#YIS56I  
 if(HC_ACTION==nCode) 71+ bn  
 { |!q,J  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 elGwS\sw  
   switch(wParam) -=W Qed}  
   {  s-801JpiJ  
    case VK_MENU: LrH"d  
     MaskBits&=~ALTBIT; L$z(&%Nx  
     break; A\w"!tNM|  
    case VK_CONTROL: h!mx/Hx  
     MaskBits&=~CTRLBIT; ]3Y J a  
     break; dQs>=(|t  
    case VK_SHIFT: a=4 `C*)  
     MaskBits&=~SHIFTBIT; r_hs_n!6  
     break; >ZwDcuJ~Lz  
    default: //judge the key and send message o- v#Zl  
     break; X> T_Xc  
   } a@S{ A5j  
   for(int index=0;index<MAX_KEY;index++){ Kw7uUJR  
    if(hCallWnd[index]==NULL) 0N87G}Xu  
     continue; mUNAA[0 L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XI+GWNAmJ  
    { ;(-Wc9=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); tc0(G~.N  
     bProcessed=TRUE; c6T[2Ig  
    } =D&XE*qkZ  
   } 5AK@e|G$w  
  } o1Krp '*  
  else if((lParam&0xc000ffff)==1){ //有键按下 ~l8w]R3A  
   switch(wParam) JT! Cb$!  
   { ~p`[z~|  
    case VK_MENU: Ye|(5f  
     MaskBits|=ALTBIT; b]4\$rW7  
     break; \iRmGvT  
    case VK_CONTROL: G1a56TIN~  
     MaskBits|=CTRLBIT; <{T5}"e  
     break; / K(l[M  
    case VK_SHIFT: M`&78j  
     MaskBits|=SHIFTBIT; ;4QE.&s`  
     break; `\r <3?  
    default: //judge the key and send message &`IJ55Z-)  
     break; `x`zv1U  
   } .lAPlJOO  
   for(int index=0;index<MAX_KEY;index++){ ;efF]")  
    if(hCallWnd[index]==NULL) >a;LBQ0  
     continue; )UtK9;@"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I|l5e2j  
    { e>m+@4*sn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TkR#Kzv380  
     bProcessed=TRUE; t*J?#r  
    } +|--}iE5n  
   } ..R JHa6B  
  } CofTTYl  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,e^~(ITaq  
   for(int index=0;index<MAX_KEY;index++){ Z,DSTP\|  
    if(hCallWnd[index]==NULL) 1k]L,CX  
     continue; ~d3|zlh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _<GXR ?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {"2Hv;x  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Mh2Zj  
   } {oS/Xa  
  } r~G  amjS  
 } >`l^ C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;H3~r^>c  
} yIC C8M  
I Z|EPzS  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: <KJ|U0/jGd  
^u2x26].  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); / */"gz%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #iQF)x| D  
'h@&rr@5  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: oE_*hp+  
v 8EI   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Nt;1&dwUb  
{ e)y+]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 9C8 G(r  
 { gC F9XKW  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 u_}UU 2  
  SaveBmp(); K^",LCJA  
  return FALSE; 53$;ZO3  
 } N,Js8Z"  
 …… //其它处理及默认处理 G?,"AA;  
} !*3]PZ25a(  
H|$ *HQm  
GO.7IL{ {  
  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。 KG4zjQf  
vw$b]MO!  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 nly}ly Q/  
.mNw^>:cq  
  二、编程步骤 oVr:ZwkG3  
;<*USS6X  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 0|]d^bo  
">M&/}4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 3ZN\F  
]9~Il#  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; P+y XC^ ,  
\mTi@T!&  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;  7|yEf  
BnfuI  
  5、 添加代码,编译运行程序。 %O!TS_~9  
W56VA>ia  
三、程序代码 "[rz*[o8I  
*Z\AO'h=Z  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0_AIKJrL  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) HRJ\H- V  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #k1IrqUp  
#if _MSC_VER > 1000 @LFB}B  
#pragma once t&p I  
#endif // _MSC_VER > 1000 R )4,f~@"  
#ifndef __AFXWIN_H__ >Q'*~S@v3  
#error include 'stdafx.h' before including this file for PCH #C'E'g0  
#endif *VH Wvj  
#include "resource.h" // main symbols A^$xE6t  
class CHookApp : public CWinApp Pe-rwM  
{ 8_ascvs5  
 public: O)DAYBv^  
  CHookApp(); _;%l~q/  
  // Overrides ;" D~F  
  // ClassWizard generated virtual function overrides +6}CNC9Mp  
  //{{AFX_VIRTUAL(CHookApp) *FC|v0D  
 public: Q"uK6ANp'  
  virtual BOOL InitInstance(); *2}f $8  
  virtual int ExitInstance(); L7nG5i  
  //}}AFX_VIRTUAL (>Nwd^  
  //{{AFX_MSG(CHookApp) '@ p464  
  // NOTE - the ClassWizard will add and remove member functions here. :xTm- L  
  // DO NOT EDIT what you see in these blocks of generated code ! (74y2U6  
  //}}AFX_MSG ;y{(#X#  
  DECLARE_MESSAGE_MAP() ?S9vYaA$  
}; k ]T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); .XkD2~;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +sTPTCLE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); = y(*?TZH  
BOOL InitHotkey(); yye5GVY$  
BOOL UnInit(); p] N/]2rR  
#endif ? HNuffk  
`>b,'u6F  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~{);Ab.9+  
#include "stdafx.h" -E3cS  
#include "hook.h" lWd@  
#include <windowsx.h> ,jtaTG.>  
#ifdef _DEBUG T@`Al('  
#define new DEBUG_NEW >)u{%@Rcy{  
#undef THIS_FILE c10$5V&@  
static char THIS_FILE[] = __FILE__; 717G CL@  
#endif SjY|aW+wAL  
#define MAX_KEY 100 )m[<lJ bw  
#define CTRLBIT 0x04 QoZZXCU  
#define ALTBIT 0x02 s&'FaqE  
#define SHIFTBIT 0x01 | lZJt  
#pragma data_seg("shareddata") Fa\jVFIQ  
HHOOK hHook =NULL; ?Z4%u8Krvz  
UINT nHookCount =0; Vy|4k2  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Ud2Tn*QmI  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT : bi(mX7t  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey WRA(k  
static int KeyCount =0; /u_9uJ"-K(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift l]#=I7 6  
#pragma data_seg() 7lA_*t@y  
HINSTANCE hins; )v11j.D  
void VerifyWindow(); ms!|a_H7 r  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ywkRH  
//{{AFX_MSG_MAP(CHookApp) m2YsE  j7  
// NOTE - the ClassWizard will add and remove mapping macros here. "nb.!OG~(  
// DO NOT EDIT what you see in these blocks of generated code! ^nNpT!o  
//}}AFX_MSG_MAP I.(@#v7T  
END_MESSAGE_MAP() |W$|og'wC  
61_-G#W  
CHookApp::CHookApp() c53:E'g  
{ cH4 PrMm&  
 // TODO: add construction code here, WRAL/  
 // Place all significant initialization in InitInstance _%Ua8bR$  
} OB\ZT@l  
]h&1|j1  
CHookApp theApp; O:a=94  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >dJ~  
{ $+ N~Fa  
 BOOL bProcessed=FALSE; Lfdg5D5.P  
 if(HC_ACTION==nCode) ij~-  
 { S0gxVd(  
  if((lParam&0xc0000000)==0xc0000000){// Key up h^qZi@L  
   switch(wParam) F u^j- Io  
   { b62B|0i  
    case VK_MENU: rlawH}1b  
     MaskBits&=~ALTBIT; ~Hv>^u Mh  
     break; J .TK<!  
    case VK_CONTROL: $~/cxLcT  
     MaskBits&=~CTRLBIT; r\FZ-gk}Q  
     break; = &?&}pVF  
    case VK_SHIFT: rly%+B `/  
     MaskBits&=~SHIFTBIT; /Hq  
     break; ~tV7yY|zr  
    default: //judge the key and send message o)n)Z~  
     break; D/ sYH0.V$  
   } A>e-eD xi  
   for(int index=0;index<MAX_KEY;index++){ q8-hbWNm4  
    if(hCallWnd[index]==NULL) _dz ZS(7M6  
     continue; }p)Hw2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >SL mlK  
    { p >ua{}!L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -*~ @?  
     bProcessed=TRUE; vfvp#  
    } sf[|8}(  
   } 42A'`io[w]  
  } Y'bz>@1(  
  else if((lParam&0xc000ffff)==1){ //Key down MP<]-M'|<  
   switch(wParam) GvgTbCxnN  
   { r}^1dO  
    case VK_MENU: afna7TlS  
     MaskBits|=ALTBIT; 5 r_Z3/%  
     break; 5M~nNm[xJU  
    case VK_CONTROL: vu91" 4Fa  
     MaskBits|=CTRLBIT; [hpkE lE  
     break; =<m!% /I  
    case VK_SHIFT: E{ e  
     MaskBits|=SHIFTBIT; mvc ;.+  
     break; nnN$?'%~6  
    default: //judge the key and send message K|$ c#X  
     break; Fj2z$   
   } cQ1Axs TO  
   for(int index=0;index<MAX_KEY;index++) -$:*!55:j  
   { a~a:mM > p  
    if(hCallWnd[index]==NULL) L-S5@;"  
     continue; {X{S[(|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m&D I2he  
    { @9n|5.i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w0Ex}  
     bProcessed=TRUE; ~Dz:n]Vk/  
    } jF j'6LT9/  
   } /]j{P4  
  } gPc1oc(  
  if(!bProcessed){ :4Nv6X61  
   for(int index=0;index<MAX_KEY;index++){ L(u@%.S  
    if(hCallWnd[index]==NULL) <uJ {>~  
     continue; }!>\Ja<\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =EM<LjO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5@ td0  
   } :t9![y[=|  
  } 5}Ge  
 } ^ <`SUBI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vV$^`WY4  
} TOKt{`2}  
_e ;b B?S  
BOOL InitHotkey() *i#N50k*j'  
{ p-)@#hE  
 if(hHook!=NULL){ DNqV]N_W  
  nHookCount++; )V>zXy}Y  
  return TRUE; ~n) |  
 } GD d'{qE6  
 else |6DJ5VFzD  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); , %8)I("  
  if(hHook!=NULL) p{W Amly  
   nHookCount++; yufw}Lo-  
  return (hHook!=NULL); 7-n HPDp'  
} V9}\0joM  
BOOL UnInit() km5gO|V>m  
{ 5pDE!6gQ  
 if(nHookCount>1){ 2-N7%]h  
  nHookCount--; y= f.;  
  return TRUE; a73VDQr I  
 } .m8l\h^3  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $IX(a4'  
 if(unhooked==TRUE){ ub9[!}r't  
  nHookCount=0;  4q7H  
  hHook=NULL; 4|I;z  
 } ;r~1TUKb  
 return unhooked; %saP>]o  
} }qoId3iY!7  
lxgfi@@+h  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~MC 5rOA  
{ `8O Bw  
 BOOL bAdded=FALSE; [A {o"zY  
 for(int index=0;index<MAX_KEY;index++){ Rs S:I6L  
  if(hCallWnd[index]==0){ oQV3  
   hCallWnd[index]=hWnd; ,30lu a  
   HotKey[index]=cKey; vO~w~u5  
   HotKeyMask[index]=cMask; Rr CG(Bh  
   bAdded=TRUE; IBeorDIZ  
   KeyCount++; YcwDNsk  
   break; I3r")}P  
  } qUmSB"#Z  
 } k:j_:C&.  
 return bAdded; MaD|X_g  
} 66 R=  
Vj1V;dHv  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~}d\sQF .  
{ A-3^~aEgx  
 BOOL bRemoved=FALSE; J(!=Dno  
 for(int index=0;index<MAX_KEY;index++){ iHc(e(CB<  
  if(hCallWnd[index]==hWnd){ x\~ <8o  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ QJVB:>A  
    hCallWnd[index]=NULL; p^q/u  
    HotKey[index]=0; +cYDz#3%  
    HotKeyMask[index]=0; V4}jv7>A  
    bRemoved=TRUE; "s]  
    KeyCount--; a'Odw2Q_  
    break; _%Xp2`m  
   } 8rlf9m  
  } lc~c=17  
 } 2vG X\W% 3  
 return bRemoved; 8tv4_Lbx  
} C@]D*k  
Bfo#N31F}  
void VerifyWindow() +$VDV4l  
{ J1cz D|(  
 for(int i=0;i<MAX_KEY;i++){ u*5}c7)uId  
  if(hCallWnd!=NULL){ 4|5;nxkGm8  
   if(!IsWindow(hCallWnd)){ 3]lq#p:  
    hCallWnd=NULL; f_LXp$n  
    HotKey=0; sKKc_H3YSH  
    HotKeyMask=0; 3WwCo.q;m  
    KeyCount--; UY({[?Se  
   } LY)Wwl*wc  
  } S *J{  
 } Wtk|}>Pf  
} 5%QYe]D  
[:(O`#  
BOOL CHookApp::InitInstance() 4Y3@^8h&=  
{ xhho{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]}l.*v\uK  
 hins=AfxGetInstanceHandle(); j1->w8  
 InitHotkey(); W+=j@JY}q9  
 return CWinApp::InitInstance(); hS &H*  
} g@M5_I(W  
<3N\OV2  
int CHookApp::ExitInstance() j x< <h _j  
{ rwW"B  
 VerifyWindow(); %`$:/3P$U  
 UnInit(); zd- *UF i  
 return CWinApp::ExitInstance(); qB K68B)  
} 2G5|J{4w  
=N\$$3m?  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file HN/YuP03[  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Q7F4OS5b  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ HGh)d` 8  
#if _MSC_VER > 1000 nSQ]qH&4d  
#pragma once Q"eqql<h#  
#endif // _MSC_VER > 1000 >c Tt2v  
3$K[(>s  
class CCaptureDlg : public CDialog ?G~rYETvw  
{ bf1$:09  
 // Construction 0LzS #J+  
 public: $RF.LVc  
  BOOL bTray; lFIaC}  
  BOOL bRegistered; =HIKn6C<  
  BOOL RegisterHotkey(); K%/\XnCY  
  UCHAR cKey; gN(kRhp  
  UCHAR cMask; :2NV;7Wke6  
  void DeleteIcon(); [)8O\/:  
  void AddIcon(); 5?Q5cD2]\6  
  UINT nCount; UA6 C/  
  void SaveBmp(); 'x? |tKzd  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8dt=@pwx&  
  // Dialog Data mRyf+O[  
  //{{AFX_DATA(CCaptureDlg) QZ7W:%r(4  
  enum { IDD = IDD_CAPTURE_DIALOG }; %yKcp5_  
  CComboBox m_Key; a Iyzt  
  BOOL m_bControl; -AVT+RE9z  
  BOOL m_bAlt; )>Z@')Uk:  
  BOOL m_bShift; Mg8ciV}\xY  
  CString m_Path; l<S3<'&  
  CString m_Number; $I#~<bW,  
  //}}AFX_DATA Rc D5X{qS#  
  // ClassWizard generated virtual function overrides fwzyCbks  
  //{{AFX_VIRTUAL(CCaptureDlg) BonjK#  
 public: =F/R*5:T  
  virtual BOOL PreTranslateMessage(MSG* pMsg); H>]*<2(=-  
 protected: x N>\t& c  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?;5/"/i  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Nknd8>Hy+  
  //}}AFX_VIRTUAL Kc1w[EQ  
  // Implementation fo/sA9  
 protected: 67}8EV!/k  
  HICON m_hIcon; L.K|]]u  
  // Generated message map functions a5pM~.]  
  //{{AFX_MSG(CCaptureDlg) Pjvb}q=  
  virtual BOOL OnInitDialog(); eL)m(  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~mah.8G  
  afx_msg void OnPaint(); 'aD"v>  
  afx_msg HCURSOR OnQueryDragIcon(); <j#IR  
  virtual void OnCancel(); CV{ZoY  
  afx_msg void OnAbout(); .ty2! .  
  afx_msg void OnBrowse(); gwg~4:W  
  afx_msg void OnChange(); j1K~zG  
 //}}AFX_MSG GuL0:,  
 DECLARE_MESSAGE_MAP() /J!hKK^k  
}; &pz`gna  
#endif e,#5I(E  
H D$`ZV  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file A93(} V7I  
#include "stdafx.h" {LqYb:/C5U  
#include "Capture.h" tId,Q>zH  
#include "CaptureDlg.h" lq`7$7-4  
#include <windowsx.h> @V Tw>=94  
#pragma comment(lib,"hook.lib") Vz!{nL0Q(  
#ifdef _DEBUG MDd 2B9cy[  
#define new DEBUG_NEW I7|a,Q^f  
#undef THIS_FILE UaQW<6+  
static char THIS_FILE[] = __FILE__; -{d(~XIo  
#endif -\ew,y  
#define IDM_SHELL WM_USER+1 b!"qbC1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +[S<"}ls7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }PDtx:T-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; AtAu$"ue  
class CAboutDlg : public CDialog 6*>vie  
{ q %tq9%  
 public: i{Q,>Rt  
  CAboutDlg(); juM~X5b  
  // Dialog Data P^lRJB<$Q  
  //{{AFX_DATA(CAboutDlg) S4(?= ,^-  
  enum { IDD = IDD_ABOUTBOX }; ,L>{(Q)  
  //}}AFX_DATA ~G^+.>j  
  // ClassWizard generated virtual function overrides D`B*+  
  //{{AFX_VIRTUAL(CAboutDlg) d=\\ik8  
 protected: ,~l4-x.,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l}g_<  
  //}}AFX_VIRTUAL Xo.3OER  
  // Implementation vZ=dlu_t  
 protected: u^VQwu6?G  
  //{{AFX_MSG(CAboutDlg) d] E.F64{  
  //}}AFX_MSG 76c:* bZ  
  DECLARE_MESSAGE_MAP() cauKG@:2F  
}; 7eZwpg?K  
Tn>L?  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) EW]8k@&g  
{ $3970ni,?O  
 //{{AFX_DATA_INIT(CAboutDlg) ;\/ RgN  
 //}}AFX_DATA_INIT G(hnrRxn  
} #xhl@=W;  
y{tM|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,|UwZ_.  
{ $"Ci{iE  
 CDialog::DoDataExchange(pDX); [$\VvRu%  
 //{{AFX_DATA_MAP(CAboutDlg) f=4q]y#& X  
 //}}AFX_DATA_MAP 1x+w|h  
} O#vIn}  
0? KvR``Aj  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) YQO9$g0% ~  
 //{{AFX_MSG_MAP(CAboutDlg) \[B#dw#  
 // No message handlers HXqG;Fds(  
 //}}AFX_MSG_MAP ?i~mt'O  
END_MESSAGE_MAP() nK]L0*s  
k)9 pkPl  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 3|/zlKZz  
: CDialog(CCaptureDlg::IDD, pParent) OF! n}.O(  
{ g9=O<u#  
 //{{AFX_DATA_INIT(CCaptureDlg) }.<]A  
  m_bControl = FALSE; u H)v\Js  
  m_bAlt = FALSE; 79'N/:.  
  m_bShift = FALSE; 6:G ::"ew  
  m_Path = _T("c:\\"); +/#Lm#*nu%  
  m_Number = _T("0 picture captured."); eI5W; Q4  
  nCount=0; anUH'mcK*  
  bRegistered=FALSE; @iYr<>iDZ  
  bTray=FALSE; >~G _'~_f  
 //}}AFX_DATA_INIT &=-{adm  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Qu|<1CrZj]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^JB5-EtL(  
} }/%^;@q;  
U+ief?;4F  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) j sw0"d(  
{ gJ5|P .  
 CDialog::DoDataExchange(pDX); cbX  <  
 //{{AFX_DATA_MAP(CCaptureDlg) +~EFRiP]  
  DDX_Control(pDX, IDC_KEY, m_Key); 2&:w_KJ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); m'L8z fX  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {UOR_Vt!*  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); #)<WQZ)  
  DDX_Text(pDX, IDC_PATH, m_Path); EwOi` g  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /A%31WE&1  
 //}}AFX_DATA_MAP T_4y;mf!@O  
} um mkAeWb  
inv 5>OeG  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ZfWF2%]<  
//{{AFX_MSG_MAP(CCaptureDlg) 1}I%yOi)  
 ON_WM_SYSCOMMAND() ?C|b>wM/  
 ON_WM_PAINT() )Hlc\Mgy  
 ON_WM_QUERYDRAGICON() X&bnyo P  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) =:7OS>x  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &^b mZj!  
 ON_BN_CLICKED(ID_CHANGE, OnChange) An3%@;  
//}}AFX_MSG_MAP 9]*hP](  
END_MESSAGE_MAP() 7V7iIbi  
.s>PDzM $  
BOOL CCaptureDlg::OnInitDialog() w!/se;_H+w  
{ .c2Zr|X  
 CDialog::OnInitDialog(); ZHOh(  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `1U?^9Nf  
 ASSERT(IDM_ABOUTBOX < 0xF000); rtgu{m02  
 CMenu* pSysMenu = GetSystemMenu(FALSE); /-&a]PJ  
 if (pSysMenu != NULL) ){,v&[  
 { Uz; pNWMk  
  CString strAboutMenu; SXm Hn.?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); '?v-o)X  
  if (!strAboutMenu.IsEmpty()) ugMf pT)  
  { G' a{;3  
   pSysMenu->AppendMenu(MF_SEPARATOR); tGh!5EZ6`  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); HCVMqG!  
  } BJI"DrF  
 } lG!We'?  
 SetIcon(m_hIcon, TRUE); // Set big icon hS7o=G[  
 SetIcon(m_hIcon, FALSE); // Set small icon -PH!U Hg  
 m_Key.SetCurSel(0); 2ID]it\5  
 RegisterHotkey(); #MI4 `FZ  
 CMenu* pMenu=GetSystemMenu(FALSE); dQH9NsV7g  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); P[bj {lo  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); XCU>b[Cj,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (cEjC`]  
 return TRUE; // return TRUE unless you set the focus to a control w%Tjn^d  
} > z1q\cz  
6. 6g9  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) p:8&&v~I  
{ sas:5iB5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) x9B{|+tIoc  
 { )M(-EDL>Qk  
  CAboutDlg dlgAbout; 2K&5Kt/  
  dlgAbout.DoModal(); SLMnEtyTS  
 } Hwm] l`E]  
 else mtg3}etA  
 { >YW_}kd  
  CDialog::OnSysCommand(nID, lParam); y72=d?]W  
 } &^!vi2$5}  
} [qGj*`@C  
lZ` CFZR0  
void CCaptureDlg::OnPaint() a jyuk@  
{ \z>L,U  
 if (IsIconic()) ,"Nfo`7  
 { ag\xwS#i5H  
  CPaintDC dc(this); // device context for painting NU?05sF  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); idh5neyL  
  // Center icon in client rectangle } :8{z`4H  
  int cxIcon = GetSystemMetrics(SM_CXICON); vpl> 5%  
  int cyIcon = GetSystemMetrics(SM_CYICON); 3BWYSJ|  
  CRect rect; y&$v@]t1  
  GetClientRect(&rect); yw9)^JU8"  
  int x = (rect.Width() - cxIcon + 1) / 2; .q^+llM  
  int y = (rect.Height() - cyIcon + 1) / 2; ?* %J Gz_  
  // Draw the icon f mQ`8b  
  dc.DrawIcon(x, y, m_hIcon); S>s{t=AY~  
 } %RF9R"t$  
 else {[%kn rRJ  
 { +8\1.vY  
  CDialog::OnPaint(); !E+.(  
 } g1TMyIUt[  
} Tf1G827  
bx&?EUx+b  
HCURSOR CCaptureDlg::OnQueryDragIcon() ndU<,{r  
{  UX& ?^]  
 return (HCURSOR) m_hIcon; `96PY !$u  
} K_X10/#b&  
Pa-p9]gq  
void CCaptureDlg::OnCancel() Lupug"p0   
{ 3HP o*~"]  
 if(bTray) {x#I&ra  
  DeleteIcon(); 6+hx64 =  
  CDialog::OnCancel(); 2,,t+8"`  
} -'iV-]<  
fxKhe[;  
void CCaptureDlg::OnAbout() +7]]=e<[E  
{ VS{po:]A  
 CAboutDlg dlg; .+ w#n<  
 dlg.DoModal(); H3{FiB]  
} sAG#M\A6  
9nrH 6]  
void CCaptureDlg::OnBrowse() e MT5bn  
{ @ !UuK;  
 CString str; ]a}K%D)H  
 BROWSEINFO bi; ,XJ Xw(LM  
 char name[MAX_PATH]; I Y='tw  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 'nO%1BZj+  
 bi.hwndOwner=GetSafeHwnd(); [h GS*  
 bi.pszDisplayName=name; mrgieb%  
 bi.lpszTitle="Select folder"; KkJK5dZo  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; dO{a!Ca  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); quPNwNy  
 if(idl==NULL) GYq.!d@O  
  return; MvLmEmKb}\  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Pl}>  
 str.ReleaseBuffer(); \q0wY7w  
 m_Path=str; '%2q'LqSA  
 if(str.GetAt(str.GetLength()-1)!='\\') `?fY!5BA  
  m_Path+="\\"; @6N$!Q?  
 UpdateData(FALSE); ?pF7g$>q  
} .(7 end<  
?7Y6: zo$^  
void CCaptureDlg::SaveBmp() YFF\m{#  
{ {xzs{)9|Y4  
 CDC dc; -9Ll'fbq  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #@#/M)  
 CBitmap bm; EqV]/0-\  
 int Width=GetSystemMetrics(SM_CXSCREEN); v7ShXX:  
 int Height=GetSystemMetrics(SM_CYSCREEN); OcBK n=8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); |H LU5=Y  
 CDC tdc; l^B PTg)X@  
 tdc.CreateCompatibleDC(&dc); C{r Sq  
 CBitmap*pOld=tdc.SelectObject(&bm); ,o3{?o]s  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;6T>p  
 tdc.SelectObject(pOld); X<OOgC  
 BITMAP btm; {O4y Y=G  
 bm.GetBitmap(&btm); g=T !fF=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; <]jKpJ{3N  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #@*;Y(9Ol  
 BITMAPINFOHEADER bih; X \1grM  
 bih.biBitCount=btm.bmBitsPixel; w[bhm$SX]B  
 bih.biClrImportant=0; ^HYrJr$y  
 bih.biClrUsed=0; yv@td+-"D  
 bih.biCompression=0; sSM^net0  
 bih.biHeight=btm.bmHeight; ^` 96L  
 bih.biPlanes=1; 8N8N)#A[  
 bih.biSize=sizeof(BITMAPINFOHEADER); n%M-L[n  
 bih.biSizeImage=size; {Gd<+tQg  
 bih.biWidth=btm.bmWidth; zuq7 x7  
 bih.biXPelsPerMeter=0; :slVja$e  
 bih.biYPelsPerMeter=0; -/k;VT|  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); H1alf_(_ \  
 static int filecount=0; h]6"~ m  
 CString name; iL%Q@!ka  
 name.Format("pict%04d.bmp",filecount++); m3cO { 1I  
 name=m_Path+name; 0gs0[@  
 BITMAPFILEHEADER bfh; Q/y^ff]=  
 bfh.bfReserved1=bfh.bfReserved2=0; v7i5R !  
 bfh.bfType=((WORD)('M'<< 8)|'B'); B-@ ]+W  
 bfh.bfSize=54+size; &K1\"  
 bfh.bfOffBits=54; ubpVrvu@  
 CFile bf; k|Hxd^^I  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ RW#&f*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5L'bF2SI  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $!(J4v=X  
  bf.WriteHuge(lpData,size); y2>XLELy  
  bf.Close(); JwkMRO  
  nCount++; 7(q EHZEr  
 } z2Pnni7Ys  
 GlobalFreePtr(lpData); \5]${vs&s  
 if(nCount==1) MS Ml  
  m_Number.Format("%d picture captured.",nCount); eX;Tufe*(Q  
 else px!TRb f  
  m_Number.Format("%d pictures captured.",nCount); j"8f,er  
  UpdateData(FALSE); @dy<=bh~  
} `YZK$ -,  
tKnvNOhn  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,}("es\b  
{ (#dwIBBFt  
 if(pMsg -> message == WM_KEYDOWN) F|eKt/>e  
 { A@-A_=a,  
  if(pMsg -> wParam == VK_ESCAPE) ]/o0p  
   return TRUE; MQ9Nn|4  
  if(pMsg -> wParam == VK_RETURN) (Hr_gkGtM  
   return TRUE; bD&^-& G  
 } Qj?qWVapA  
 return CDialog::PreTranslateMessage(pMsg); -FAAP&LG  
} I$#B#w?!$r  
K%XQdMv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "kE$2Kg  
{ 3Ishe"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +}XFkH~  
  SaveBmp(); Ddf7wszW  
  return FALSE; 4oY<O  
} #s'UA!)  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 36NENzK  
 CMenu pop; Q: H`TSR]  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); bJ[{[|yEd  
 CMenu*pMenu=pop.GetSubMenu(0); /~,|zz  
 pMenu->SetDefaultItem(ID_EXITICON); J?yNZK$WqN  
 CPoint pt; NA%(ZRSg(  
 GetCursorPos(&pt); x >u \  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); r[>=iim  
 if(id==ID_EXITICON) i|z=q  
  DeleteIcon(); #B;~i6h]  
 else if(id==ID_EXIT) kl0!*j  
  OnCancel(); y+ZRh?2  
 return FALSE; BCw5.@HK*  
} x1gfo!BN  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -QUr|:SK:  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ,qx;kJJ  
 AddIcon(); B,@<60u  
 return res; _TB,2 R  
} _K4Igq  
d)G' y  
void CCaptureDlg::AddIcon() JGJXV3AT  
{ =F(fum;zH  
 NOTIFYICONDATA data; qjK'sge/  
 data.cbSize=sizeof(NOTIFYICONDATA); tD G[}j  
 CString tip;  H %Cb  
 tip.LoadString(IDS_ICONTIP); % R18  
 data.hIcon=GetIcon(0); 0Zt=1Tv  
 data.hWnd=GetSafeHwnd(); mfYY?]A*+  
 strcpy(data.szTip,tip); )1PZ#  
 data.uCallbackMessage=IDM_SHELL; X3C"A|HE9  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; XHX\+&6  
 data.uID=98; j{.P'5e@pZ  
 Shell_NotifyIcon(NIM_ADD,&data); $VWeo#b  
 ShowWindow(SW_HIDE); H5L~[\ 5t  
 bTray=TRUE; VtNY~  
} SR,id B&i  
X*Ibk-PUM  
void CCaptureDlg::DeleteIcon() !`u  
{ SDdefB  
 NOTIFYICONDATA data; j%2l%Mx(  
 data.cbSize=sizeof(NOTIFYICONDATA); px@:t}  
 data.hWnd=GetSafeHwnd(); q,#j *  
 data.uID=98; :UjF<V  
 Shell_NotifyIcon(NIM_DELETE,&data); ^)r^k8y'  
 ShowWindow(SW_SHOW); :8}iZ.  
 SetForegroundWindow(); [fN?=,8  
 ShowWindow(SW_SHOWNORMAL); "pb$[*_@$  
 bTray=FALSE; YbMeSU/sX  
}  _\H MF  
nUAoPE  
void CCaptureDlg::OnChange() $=7'Cm ?  
{ J! ;g.q  
 RegisterHotkey(); '6^20rj  
} v6gfyGCJ  
;#3l&HRKH1  
BOOL CCaptureDlg::RegisterHotkey() h0YIPB  
{ o"O=Epg  
 UpdateData(); bITc9Hqc  
 UCHAR mask=0; N5 BC<pu  
 UCHAR key=0; K~j&Q{yws@  
 if(m_bControl) >^cP]gG Y  
  mask|=4; WaU+ZgDrG  
 if(m_bAlt) <,U=w[cH  
  mask|=2; ]9xuLJ)  
 if(m_bShift) %/l9$>{  
  mask|=1; l 8I`%bu  
  key=Key_Table[m_Key.GetCurSel()]; I3;{II  
 if(bRegistered){ EXlmIY4  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); w"s;R8  
  bRegistered=FALSE; %M=[h2SN  
 } m5O;aj* i  
 cMask=mask; v/n4Lp$W^  
 cKey=key; -E6#G[JJ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (1~d/u?2\  
 return bRegistered; 7 Jxhn!  
} sV8}Gv a  
XcOfQ s  
  四、小结 AXUSU(hU  
K[tQ>C@s2  
  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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