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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: ) gxN' z  
  - P4X@s_;  
  一、实现方法 5&]a8p{  
?VyiR40-Cx  
  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: T5_rPz  
_t6 .9CXl  
#pragma data_seg("shareddata") mzf^`/NO  
HHOOK hHook =NULL; //钩子句柄 +0:]KG!Zs.  
UINT nHookCount =0; //挂接的程序数目 c >xHaA:V  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 )\{]4[9N  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 `Zci <  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey v\5`n@}4  
static int KeyCount =0; [MeFj!(  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 JE;!~=   
#pragma data_seg() z AY -Y  
E .CG  
  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。 d;).| .}P  
e`?o`@vO,  
  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: = @ 1{LF;  
hE +M|#o  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +rKV*XX@  
cKey,UCHAR cMask) zOis}$GR  
{ )OFf nKh  
 BOOL bAdded=FALSE; fD2 N}  
 for(int index=0;index<MAX_KEY;index++){ Na+3aM%%  
  if(hCallWnd[index]==0){ VrJf g  
   hCallWnd[index]=hWnd; 5zF$Q{3  
   HotKey[index]=cKey; 5$*=;ls>J  
   HotKeyMask[index]=cMask; ~vMJ?P@  
   bAdded=TRUE; zSBR_N51  
   KeyCount++; O 2+taB  
   break; 3WPZZN<K9  
  } =@d->d  
 } iVb7>d9}  
 return bAdded; 2WB`+oWox  
} c(s: f@ 1  
//删除热键 @\U] hN?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) id>2G %Tx  
{ Crezo?  
 BOOL bRemoved=FALSE; 1#|qT7  
 for(int index=0;index<MAX_KEY;index++){ ixB"6O  
  if(hCallWnd[index]==hWnd){ 'lOpoWDL  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ M|UCV_omN  
    hCallWnd[index]=NULL; IJLuu@kRm,  
    HotKey[index]=0; H4W!@"e  
    HotKeyMask[index]=0; ye4GHAm,p  
    bRemoved=TRUE; [u^~ND'  
    KeyCount--; /LG}nY  
    break; <4-g2.\  
   } e8k|%m<Sp  
  } PD-*rG `  
 } 9{-H/YS\_s  
 return bRemoved; 3E!3kSh|  
} pzT`.#N:M  
{wf5HA  
u/J1Z>0  
  DLL中的钩子函数如下: BoHNni  
}RUK?:lEA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?JR?PW8  
{ <_SdW 5BF<  
 BOOL bProcessed=FALSE; <lRjh7  
 if(HC_ACTION==nCode) )~ ^`[`  
 { x}uDW   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 p uW  
   switch(wParam) s6Il3K f  
   {  $NBQv6#:  
    case VK_MENU: ~pwk[Q!  
     MaskBits&=~ALTBIT; ;S'1fci6  
     break; x}OJ~Yk]  
    case VK_CONTROL: NOl/y@#  
     MaskBits&=~CTRLBIT; 8>|<m'e^\r  
     break; $|I hO  
    case VK_SHIFT: (XV+aQ\A  
     MaskBits&=~SHIFTBIT; qU ,{jD$  
     break; D@m3bsMwe  
    default: //judge the key and send message !^Q4ZL,-  
     break; ?2K~']\S  
   } l=<},_]{  
   for(int index=0;index<MAX_KEY;index++){ u&e?3qKX(  
    if(hCallWnd[index]==NULL) 4 i`FSO  
     continue; }wC=p>zA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8`Tj*7Y=  
    { ksyQ_4^SO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); pV$A?b"?*  
     bProcessed=TRUE; D&D-E~b^  
    } -=qHwcId  
   } S>d7q  
  } )gk tI!  
  else if((lParam&0xc000ffff)==1){ //有键按下 !z]{zM%  
   switch(wParam) %]o/p_<  
   { f;bVzti+w  
    case VK_MENU: `_OB_F  
     MaskBits|=ALTBIT; )4n]n:FjN  
     break; {]O.?Yru?  
    case VK_CONTROL: yp< )v(8|'  
     MaskBits|=CTRLBIT; dlwOmO'Bm)  
     break; fbJa$  
    case VK_SHIFT: Eg1|Kg\&  
     MaskBits|=SHIFTBIT; )IKqO:@  
     break; 4H`B]Zt7  
    default: //judge the key and send message HC| ]Au  
     break; e_3B\59k  
   } Q}1qt4xy*  
   for(int index=0;index<MAX_KEY;index++){ |wyua@2  
    if(hCallWnd[index]==NULL) SfPtG  
     continue; Gyc _B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <,J O  
    { u`pw'3hY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [+qB^6I+P%  
     bProcessed=TRUE; l=47#zbpZ]  
    } sRflabl *x  
   } 2>m"CG  
  } ;6`7 \  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Kn}Y7B{  
   for(int index=0;index<MAX_KEY;index++){ pAyUQe;X#  
    if(hCallWnd[index]==NULL) R  xc  
     continue; G9CL}=lJ,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J!yK/*sO,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0<nW nD,z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 tZ:fh  p  
   } z\Z+>A  
  } 9+~1# |  
 } =27ZY Z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +[pJr-k  
} )2R]KU_=g  
"|/q4JN)7d  
  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: /1.gv~`+  
}+F@A`Bm&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5Trc#i<\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Iz&<rL;s  
kWgrsN+Z  
  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: aUKa+"`S  
sfsK[c5bm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  9-y<= )  
{ Xet} J@C  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) GQ*or>R1  
 { bs)Ro/7}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 VA%4ssy  
  SaveBmp(); 6. vwK3\>~  
  return FALSE; 4r9AUmJqw  
 } l;h5Y<A%?  
 …… //其它处理及默认处理 *7),v+ET  
} Hh%|}*f_,  
'i 8`LPQ  
#2%8@?_-M  
  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。 *\^(-p~M  
gKRlXVS  
  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。 |j4;XaG)  
TtgsM}Fm  
  二、编程步骤 W&2r{kCsQ  
 xC2y/ ?  
  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"; o>I,$=  
\$,8aRT>#U  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; *?o 'sTH  
%%lJyLq'Vk  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 9dp1NjOtAc  
#YSFiy:+r_  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; }jYVB|2  
<M\#7.](  
  5、 添加代码,编译运行程序。 @y,>cDg  
E-#C#B  
三、程序代码 b3q&CJ4|  
{Vf].l:kn  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 2D"aAI<P  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3GXmyo:o$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ aF.fd2k  
#if _MSC_VER > 1000 }q:4Zh'l!  
#pragma once ^h"@OEga?  
#endif // _MSC_VER > 1000 c`7dNx  
#ifndef __AFXWIN_H__ YH&0Vy#c$  
#error include 'stdafx.h' before including this file for PCH D*ZswHT{y  
#endif #}[NleTVt  
#include "resource.h" // main symbols U+ V yH4"  
class CHookApp : public CWinApp Lo}zT-F  
{ ?qbq\t  
 public: ,6x>gcR  
  CHookApp(); RF'&.RtVa  
  // Overrides B%z+\<3^q  
  // ClassWizard generated virtual function overrides ]x6r P  
  //{{AFX_VIRTUAL(CHookApp) c>wn e\(5H  
 public: v R ! y#  
  virtual BOOL InitInstance(); @[]#[7  
  virtual int ExitInstance(); {Bb:\N8X  
  //}}AFX_VIRTUAL KR>o 2  
  //{{AFX_MSG(CHookApp) :71St '  
  // NOTE - the ClassWizard will add and remove member functions here. m5cRHo<9Y  
  // DO NOT EDIT what you see in these blocks of generated code ! 1}OM"V  
  //}}AFX_MSG @Z Dd(xB&  
  DECLARE_MESSAGE_MAP() =lx~tSiS  
}; _BG7 JvI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Y$W)JWMY`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); , jCE hb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U=[isi+7  
BOOL InitHotkey(); lO HW9Z  
BOOL UnInit(); {X-a6OQj  
#endif d/\ajQ1::  
!'>,37()  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. dHtEyF  
#include "stdafx.h" +_ny{i`'  
#include "hook.h" . $ HE  
#include <windowsx.h> fD%20P`.  
#ifdef _DEBUG 2j$~lI  
#define new DEBUG_NEW [iC]Wh%  
#undef THIS_FILE .L.9e#?3  
static char THIS_FILE[] = __FILE__; ?B<.d8i  
#endif STz@^A  
#define MAX_KEY 100 Raf-I+  
#define CTRLBIT 0x04 -f"{%<Q  
#define ALTBIT 0x02 X5+$:jq&  
#define SHIFTBIT 0x01 ix5<h }  
#pragma data_seg("shareddata") Twk<<  
HHOOK hHook =NULL; d1 lxz?r  
UINT nHookCount =0; s $ ?;C  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey [ZS.6{vr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT mcxD#+H 3  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )QI#szv6  
static int KeyCount =0; 7nZ3u _~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift imyfki $B  
#pragma data_seg() _Zxo <}w}y  
HINSTANCE hins; >".@;  
void VerifyWindow(); .>Fpk7  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 877Kv);  
//{{AFX_MSG_MAP(CHookApp) 'Qg.D88  
// NOTE - the ClassWizard will add and remove mapping macros here. & 5QvUn  
// DO NOT EDIT what you see in these blocks of generated code! dEam|  
//}}AFX_MSG_MAP %I@ vMs^  
END_MESSAGE_MAP() P|TM4i]  
nY,LQ0r  
CHookApp::CHookApp() |Gr@Mi5  
{ o 80x@ &A:  
 // TODO: add construction code here, {HjJ9ZGQ  
 // Place all significant initialization in InitInstance JI /iq  
} 6#HnA"I2n  
N3w y][bo  
CHookApp theApp; {"db1Gbfg  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kA9k^uR/  
{ w7f)v\p  
 BOOL bProcessed=FALSE; 2%) ~E50U  
 if(HC_ACTION==nCode) @)@tIhw  
 {  gOy{ RE  
  if((lParam&0xc0000000)==0xc0000000){// Key up o Va[  
   switch(wParam) :c(#03w*C  
   { l0tFj>q"  
    case VK_MENU: t;_1/ mt  
     MaskBits&=~ALTBIT; (*\y  
     break; A:5P  
    case VK_CONTROL: X,D ]S@  
     MaskBits&=~CTRLBIT; ]hZk #rp}  
     break; GK#D R/OM  
    case VK_SHIFT: E CPSE {  
     MaskBits&=~SHIFTBIT; ,Qj\_vr@  
     break; @2TfW]6  
    default: //judge the key and send message ;s#]."v_=  
     break; (N5"'`NZA  
   } fyxc4-D  
   for(int index=0;index<MAX_KEY;index++){ ^1Bk*?Yx\x  
    if(hCallWnd[index]==NULL) \jAI~|3  
     continue; ,C|aiSh0-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,q$2D,dz  
    { {*nE8+..A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); X7?j90tH  
     bProcessed=TRUE; 5[~ C!t;  
    } V@K^9R,|  
   } ?<^^.Si  
  } J!}R>mR  
  else if((lParam&0xc000ffff)==1){ //Key down ScRK1  
   switch(wParam) M{p9b E[j  
   { &"Fz)}  
    case VK_MENU: ""h%RhcZ\  
     MaskBits|=ALTBIT; qBZ;S3  
     break; JvS ~.g1  
    case VK_CONTROL: KVoM\ttP  
     MaskBits|=CTRLBIT; bnV)f<  
     break; TJuS)AZ C  
    case VK_SHIFT: /mwDVP<z /  
     MaskBits|=SHIFTBIT; Bo ??1y  
     break; a~zh5==QD  
    default: //judge the key and send message 1 /SB[[g  
     break; GE\({V.W  
   } |RDE/  
   for(int index=0;index<MAX_KEY;index++) l I2UpfkBP  
   { lE3&8~2   
    if(hCallWnd[index]==NULL) &09G9GsnQ  
     continue; 7>-99o^W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l s%'\}  
    { Z 2lX^z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )2r_EO@3HP  
     bProcessed=TRUE; i'}"5O+  
    } N5b&tJb M0  
   } m3|l-[!OA"  
  } =UxKa`  
  if(!bProcessed){ },#AlShZu  
   for(int index=0;index<MAX_KEY;index++){ ZT+{8,  
    if(hCallWnd[index]==NULL) 8an_s%,AW  
     continue; DXK\3vf Ot  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @"m+9ZY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9xL` i-7]  
   } Htep3Ol3  
  } 1h`#H:  
 }  5e2yJ R  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )7Oj  
} mOb@w/f  
s+v$sF  
BOOL InitHotkey() }RQ'aeVl(  
{ ?:W=ddg  
 if(hHook!=NULL){ dCzS f4:  
  nHookCount++; D?"Q)kVuD  
  return TRUE; V_KHVul  
 } X$ A ]7t  
 else =HMuAUa.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); YW"nPZNPy~  
  if(hHook!=NULL) nDNK}O~'  
   nHookCount++; *k0;R[IAV  
  return (hHook!=NULL); aI\]R:f,  
} A \Z_br  
BOOL UnInit() G ahY+$L,  
{ =BzBM`-o  
 if(nHookCount>1){ v=D4O.  
  nHookCount--; ^L'<%_# .  
  return TRUE; u#0EZ2 >#  
 } j0S[JpoF  
 BOOL unhooked = UnhookWindowsHookEx(hHook); S4{\5ulr7  
 if(unhooked==TRUE){ \G6V-W  
  nHookCount=0; !KHbsOT?9  
  hHook=NULL; ;\iu*1>Z,&  
 } @! jpJ}  
 return unhooked; I2?g'tz  
} DhG{hQ[[  
:oJ!9\5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) UQjZhH  
{ 0:eK}tC  
 BOOL bAdded=FALSE; b=:%*gq,  
 for(int index=0;index<MAX_KEY;index++){ o|V=3y Ok  
  if(hCallWnd[index]==0){ qtp-w\#S$  
   hCallWnd[index]=hWnd; C(}Kfi@6N  
   HotKey[index]=cKey; n'@XgUI,  
   HotKeyMask[index]=cMask; Qq\hD@Z|  
   bAdded=TRUE; ^1XnnQa  
   KeyCount++; ?#L5V'ZZ*  
   break; 4*Z>-<W=  
  } Zy6>i2f4f  
 } >P2QL>P  
 return bAdded; &tw{d DD6  
} D*8oFJub  
;(LC{jY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lV?OYS|4i  
{ &I/C^/F&  
 BOOL bRemoved=FALSE; i.+#a2   
 for(int index=0;index<MAX_KEY;index++){ >  !WFY  
  if(hCallWnd[index]==hWnd){ 5ma~Pjt8}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hy@e(k|S]U  
    hCallWnd[index]=NULL; > Cx;h=  
    HotKey[index]=0; _Tf0L<A'R  
    HotKeyMask[index]=0; 2X=*;r"{J  
    bRemoved=TRUE; 9tB:1n}  
    KeyCount--; 'z Qp64]F  
    break; Y>K3.*.  
   } q)]S:$?BT  
  } @oFuX.  
 } ] -G~  
 return bRemoved; gR k+KGKn<  
} _"qX6Jc  
, ins/-3  
void VerifyWindow() h8HA^><Xr  
{ z4(Q.0x7  
 for(int i=0;i<MAX_KEY;i++){ \p!mX|  
  if(hCallWnd!=NULL){ !^w}Sp  
   if(!IsWindow(hCallWnd)){ /x&52~X5-  
    hCallWnd=NULL; wdEQB-dA  
    HotKey=0; yzJTNLff  
    HotKeyMask=0; :UDe\zcd "  
    KeyCount--; *l'5z)]  
   } )H<F([Jri  
  } wU5= '  
 } A<cnIUW  
} K<"Y4O#]  
9 icy&'  
BOOL CHookApp::InitInstance() :4S~}}N  
{ CS Isi]H  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !,;/JxfgVh  
 hins=AfxGetInstanceHandle(); aP +)  
 InitHotkey(); Evq^c5n>{  
 return CWinApp::InitInstance(); Vxim$'x!  
} M"z3F!-j  
q]z%<`.9*  
int CHookApp::ExitInstance() 9'h4QF+Y  
{ U9yR~pw  
 VerifyWindow(); x5!lnN,#  
 UnInit(); J ?H| "  
 return CWinApp::ExitInstance(); P!lTK   
} hgF4PdO1e  
Rm=[Sj84  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %2rUJaOgy$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) t0o'_>*?A  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,F0bkNBG  
#if _MSC_VER > 1000 /PtmJ2 [  
#pragma once <,(Ww   
#endif // _MSC_VER > 1000 yyu f  
8,&QY%8pX  
class CCaptureDlg : public CDialog Z~ {[YsG  
{ R>`TV(W`9  
 // Construction F$H^W@<w  
 public: OEj%cB!  
  BOOL bTray; 7a'@NgiGg  
  BOOL bRegistered; m*H6\on:  
  BOOL RegisterHotkey(); aZYs?b>Gm  
  UCHAR cKey; mX QVL.P\  
  UCHAR cMask; 5\P3JoH:Yg  
  void DeleteIcon(); ~er4w+"  
  void AddIcon(); OwG:+T_  
  UINT nCount; (Qz| N  
  void SaveBmp(); %z AN@  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .5?Md  
  // Dialog Data >tVD[wVF0  
  //{{AFX_DATA(CCaptureDlg) -nC!kpo  
  enum { IDD = IDD_CAPTURE_DIALOG }; |>AHc_:$$  
  CComboBox m_Key; 3']=w@~ O[  
  BOOL m_bControl; Lw #vHNf6  
  BOOL m_bAlt; aG/L'weR  
  BOOL m_bShift; aT%6d@g  
  CString m_Path; 4Nz]LK%@  
  CString m_Number; \J3n[6;  
  //}}AFX_DATA K@+(6\6I  
  // ClassWizard generated virtual function overrides rJ_fg$.<  
  //{{AFX_VIRTUAL(CCaptureDlg) '5m`[S-IU  
 public: zu|=1C#5h  
  virtual BOOL PreTranslateMessage(MSG* pMsg); / ,#&Htk  
 protected: :TN^}RML  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support p+d?k"WN?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); k6W  [//  
  //}}AFX_VIRTUAL pbb6?R,  
  // Implementation F5;x>;r  
 protected: <ooRpn  
  HICON m_hIcon; *[[TDduh&  
  // Generated message map functions V/i7Zh#2:  
  //{{AFX_MSG(CCaptureDlg) !Typ_Cs  
  virtual BOOL OnInitDialog(); vaUUesytt  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0`l(c  
  afx_msg void OnPaint(); E7UYJ)6]  
  afx_msg HCURSOR OnQueryDragIcon(); Qg4g(0E@  
  virtual void OnCancel(); @+ U++  
  afx_msg void OnAbout(); :6X?EbXhK  
  afx_msg void OnBrowse(); L BP|  
  afx_msg void OnChange(); 0'.7dzz  
 //}}AFX_MSG U `<?~Bz  
 DECLARE_MESSAGE_MAP() \%011I4  
}; S) [$F}  
#endif tcU4$%H/  
Af_yb`W?  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file A/{0J\pA  
#include "stdafx.h" dk4|*l-  
#include "Capture.h"  h2]gA_T`  
#include "CaptureDlg.h" dJwE/s  
#include <windowsx.h> ![#>{Q4i  
#pragma comment(lib,"hook.lib") Rt10:9Kz$  
#ifdef _DEBUG 13 e @  
#define new DEBUG_NEW X:Z*7P/  
#undef THIS_FILE L=."<,\  
static char THIS_FILE[] = __FILE__; $*[-kIy  
#endif bp?4)C*R  
#define IDM_SHELL WM_USER+1 2Sg,b8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wth*H$iF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -v7O*xm"  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; {]CO;5:  
class CAboutDlg : public CDialog b];? tP  
{ ~}fQ.F*7R  
 public: q-)Ynp4'  
  CAboutDlg(); ~)&im.Q4  
  // Dialog Data N3}jLl/  
  //{{AFX_DATA(CAboutDlg) geB]~/-p  
  enum { IDD = IDD_ABOUTBOX }; Ue22,Pp6  
  //}}AFX_DATA 8f0Ytfhw  
  // ClassWizard generated virtual function overrides 4?)-;Hx_X  
  //{{AFX_VIRTUAL(CAboutDlg) ^6U0n!nU  
 protected: M8wEy_XB1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support gr y]!4Hy  
  //}}AFX_VIRTUAL ;3H#8x-  
  // Implementation p+>vX X  
 protected: zgh~P^Z  
  //{{AFX_MSG(CAboutDlg) K9(Su`zr  
  //}}AFX_MSG 0ynvn9@t  
  DECLARE_MESSAGE_MAP() ,S7 g=(27(  
}; KDzTe9  
YZH &KGY  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) R |h(SXa  
{ BE]PM nI  
 //{{AFX_DATA_INIT(CAboutDlg) wkwsBi  
 //}}AFX_DATA_INIT #^ cmh  
} ~qxuD_  
"dO>P*k,  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Hkck=@>8H*  
{ rFPfTpS  
 CDialog::DoDataExchange(pDX); \h}a?T6  
 //{{AFX_DATA_MAP(CAboutDlg) 2'6:fr=R  
 //}}AFX_DATA_MAP $rG~0  
} GE{u2<%@  
56 raZC  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) TQ\\/e:  
 //{{AFX_MSG_MAP(CAboutDlg) <CnTiS#  
 // No message handlers lZa L=HS#L  
 //}}AFX_MSG_MAP sjISVJ?  
END_MESSAGE_MAP() xEfz AJ5&  
w0FkKJV  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) M >BcYbXf  
: CDialog(CCaptureDlg::IDD, pParent) }JKK"d}U  
{ BCK0fk~  
 //{{AFX_DATA_INIT(CCaptureDlg) T+y3Ph--^  
  m_bControl = FALSE; aA5rvP +  
  m_bAlt = FALSE; ;%H/^b.c  
  m_bShift = FALSE; @a{1vT9b  
  m_Path = _T("c:\\"); N$i|[>`j  
  m_Number = _T("0 picture captured."); `>mT/Rmb@  
  nCount=0; LYv$U;*+  
  bRegistered=FALSE; hD5G\TR.  
  bTray=FALSE; mSu1/?PS  
 //}}AFX_DATA_INIT *&VqAc%qD  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Jm l4EW7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (\=iKE4#  
} OYsG#  
v)a$;P%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) },G>+ s8h  
{ ;ESuj'*t  
 CDialog::DoDataExchange(pDX); C=z7Gk=  
 //{{AFX_DATA_MAP(CCaptureDlg) X_0Ta_u?T  
  DDX_Control(pDX, IDC_KEY, m_Key); UmRI! WQl  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); k}yUD 0Y  
  DDX_Check(pDX, IDC_ALT, m_bAlt); U[Pll~m2b  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); C {GSf`D!T  
  DDX_Text(pDX, IDC_PATH, m_Path); -`o22G3w  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8=#J:LeXj  
 //}}AFX_DATA_MAP w9J^s<e  
} [e:mRMi  
[aK7v{Wu  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Ew|VDD(.  
//{{AFX_MSG_MAP(CCaptureDlg) _m+64qG_8'  
 ON_WM_SYSCOMMAND() BrQXSN$i  
 ON_WM_PAINT() (KF=v31_m  
 ON_WM_QUERYDRAGICON() ?u`TX_OsB  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) IC6}s  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ; iK9'u  
 ON_BN_CLICKED(ID_CHANGE, OnChange) b:,S  
//}}AFX_MSG_MAP N<\U$\i  
END_MESSAGE_MAP() ]ctlK'.  
*0 0K3  
BOOL CCaptureDlg::OnInitDialog() ;be2sTo  
{ W\tSXM-Hg  
 CDialog::OnInitDialog(); 3',|HA /x  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _Co*"hl>2  
 ASSERT(IDM_ABOUTBOX < 0xF000); q DQ$Zq[  
 CMenu* pSysMenu = GetSystemMenu(FALSE); (>E 70|T  
 if (pSysMenu != NULL) YuZxKuGy  
 { )4hb%U  
  CString strAboutMenu; [a&|c%h  
  strAboutMenu.LoadString(IDS_ABOUTBOX); F|3 =Cl  
  if (!strAboutMenu.IsEmpty()) Myj 68_wf  
  { )rTV}Hk  
   pSysMenu->AppendMenu(MF_SEPARATOR); $LLy#h?V]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,,Dwb\B}  
  } MMMuT^X  
 } <3wfY #;><  
 SetIcon(m_hIcon, TRUE); // Set big icon i U^tv_1  
 SetIcon(m_hIcon, FALSE); // Set small icon <4gT8 kQ$x  
 m_Key.SetCurSel(0); .."=  
 RegisterHotkey(); ;BsPms@U  
 CMenu* pMenu=GetSystemMenu(FALSE); RN0@Q~oTI  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @c<*l+Qc  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); BnLM;5 >  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ? (&)p~o  
 return TRUE; // return TRUE unless you set the focus to a control /5ngPHy&  
} 36<PI'l#~  
C>d_a;pX  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) z8SrZ#mg  
{ +w ;2kw  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) A{5^A)$  
 { *20$u% z2  
  CAboutDlg dlgAbout; <_S>-;by  
  dlgAbout.DoModal(); ZYy,gu<  
 } Q)\~=/L b  
 else y^o*wz:D*  
 { bIR AwktD  
  CDialog::OnSysCommand(nID, lParam); R89 ;<,Ie  
 } r*|#*"K"a  
} ay\e# )  
?I6us X9$  
void CCaptureDlg::OnPaint() nV|H5i;N7  
{ _]~gp.  
 if (IsIconic()) NArql  
 { %"2 ;i@  
  CPaintDC dc(this); // device context for painting : GZx-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ^6*2a(S&  
  // Center icon in client rectangle d66 GO];"  
  int cxIcon = GetSystemMetrics(SM_CXICON); 73kF=*m  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,;aELhMZ  
  CRect rect; *(%]|z}]m  
  GetClientRect(&rect); 87Sqs1>cw  
  int x = (rect.Width() - cxIcon + 1) / 2; nQ*9|v4  
  int y = (rect.Height() - cyIcon + 1) / 2; E,]G Ek  
  // Draw the icon 9'tElpDJ6#  
  dc.DrawIcon(x, y, m_hIcon); o1j_5c PS  
 } zCvt"!}RRa  
 else s3+^q  
 { .^<4]  
  CDialog::OnPaint(); ]UR@V;JG  
 } }n+#o!uEf  
} 6]=$c<.&  
^:.=S`,^  
HCURSOR CCaptureDlg::OnQueryDragIcon() 35dbDgVz$  
{ ]]\\Y|0  
 return (HCURSOR) m_hIcon; :27GqY,3sK  
} 5 ",@!1ju  
l2))StEm  
void CCaptureDlg::OnCancel() WUQlAsme  
{ YQyf:xJ  
 if(bTray) ~ kdxJP"  
  DeleteIcon(); 2|xNT9RW  
  CDialog::OnCancel(); r Z0+mS'/G  
} <,%qt_ !  
X>C l{.  
void CCaptureDlg::OnAbout() B|Y6;4?  
{ (mHCK5  
 CAboutDlg dlg; TA=VfA B  
 dlg.DoModal(); ;VY0DAp{  
} n%o"n?e  
eIEr\X4\~~  
void CCaptureDlg::OnBrowse() F;Q8^C0e*c  
{ tta\.ic  
 CString str; S&y(A0M  
 BROWSEINFO bi; Nr\[|||%  
 char name[MAX_PATH]; VCzmTnD  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); EgAM,\  
 bi.hwndOwner=GetSafeHwnd(); W0 n/B &C  
 bi.pszDisplayName=name; I:4m]q b  
 bi.lpszTitle="Select folder"; #&JhA2]q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; wb@TYvDt  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); d4Y8q1  
 if(idl==NULL) czMThm  
  return; ou;E@`h;x  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); n>d@}hyv  
 str.ReleaseBuffer(); mM| 313  
 m_Path=str; 3snr-)   
 if(str.GetAt(str.GetLength()-1)!='\\') %?gh;? GD  
  m_Path+="\\"; 26yjQ  
 UpdateData(FALSE); x>5"7MR`  
} /&g5f4[|p  
*~~&*&+  
void CCaptureDlg::SaveBmp() :x*|?zII  
{ ^l}Esz`-M  
 CDC dc; N=e-"8  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); dg9 DBn#  
 CBitmap bm; v7?sXW  
 int Width=GetSystemMetrics(SM_CXSCREEN); }P8@\2@=T  
 int Height=GetSystemMetrics(SM_CYSCREEN); ;Kq/[$~0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); F dR!jt  
 CDC tdc; \ W3\P=  
 tdc.CreateCompatibleDC(&dc); gxry?':  
 CBitmap*pOld=tdc.SelectObject(&bm); U$; FOl  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); AV"fOK;#A  
 tdc.SelectObject(pOld); ^oNk}:>  
 BITMAP btm; 0/7y&-/(  
 bm.GetBitmap(&btm); zJE$sB.f  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; OR4ZjogzY  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Q{hXP*5  
 BITMAPINFOHEADER bih; 1bW[RK;GE  
 bih.biBitCount=btm.bmBitsPixel; =|)W#x9=  
 bih.biClrImportant=0; N# o" W  
 bih.biClrUsed=0; %#!pAUP\&  
 bih.biCompression=0; F9DY\EI  
 bih.biHeight=btm.bmHeight; [X +E  
 bih.biPlanes=1; Q~R7]AyR  
 bih.biSize=sizeof(BITMAPINFOHEADER); 3l?D%E]P  
 bih.biSizeImage=size; 7Sc._G{[%  
 bih.biWidth=btm.bmWidth; Lq#>N_72W0  
 bih.biXPelsPerMeter=0; cVHv>nd#  
 bih.biYPelsPerMeter=0; =.q Zgcg  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $is|B9B  
 static int filecount=0; JZQT}  
 CString name; ';g]!XsY)  
 name.Format("pict%04d.bmp",filecount++); PP\nR @  
 name=m_Path+name; *\9JIi 2  
 BITMAPFILEHEADER bfh; jfxW9][   
 bfh.bfReserved1=bfh.bfReserved2=0; RQzcsO  
 bfh.bfType=((WORD)('M'<< 8)|'B'); rQ0V3x1"Qx  
 bfh.bfSize=54+size; o)_;cCr)q  
 bfh.bfOffBits=54; ?LP&VU1  
 CFile bf; 7_,)"J2^  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ wB(A['k  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); uWs5 +  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); e K%~`Y  
  bf.WriteHuge(lpData,size); }]0f -}  
  bf.Close(); 9mdp \A  
  nCount++; h?f)Bt}ry  
 } h{s- e.  
 GlobalFreePtr(lpData); j7&57'  
 if(nCount==1) $ b Q4[  
  m_Number.Format("%d picture captured.",nCount); C]22 [v4  
 else x.Sq2rw]V  
  m_Number.Format("%d pictures captured.",nCount); SDY!!.  
  UpdateData(FALSE); R)s@2S  
} {1H3VSYq  
Q fI =  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5ZG-3qj  
{ JGS4r+   
 if(pMsg -> message == WM_KEYDOWN) mlolSD;7  
 { 3*13XQ  
  if(pMsg -> wParam == VK_ESCAPE) v!oXcHK/  
   return TRUE; Dps0$f c  
  if(pMsg -> wParam == VK_RETURN) &. sfu$]  
   return TRUE; M" |Mte  
 } -p|@Enn  
 return CDialog::PreTranslateMessage(pMsg); 577H{;pW  
} /ESmQc:DWB  
(A.%q1h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <"|BuK  
{ ~HbZRDcJc  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ B(<;]  
  SaveBmp(); 2jQ|4$9j  
  return FALSE; FKU$HQw*  
} wyqXD.o f  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ S|U/m m  
 CMenu pop; bL`O k  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); p 4k*vuu>  
 CMenu*pMenu=pop.GetSubMenu(0); VGLE5lP X  
 pMenu->SetDefaultItem(ID_EXITICON); (h NSzG\  
 CPoint pt; _<?lP$Xr  
 GetCursorPos(&pt); <^}{sdOyu  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); VH&6Tm1  
 if(id==ID_EXITICON) :Gyv%> .  
  DeleteIcon(); $7q'Be@{  
 else if(id==ID_EXIT) \IZfp=On  
  OnCancel(); pgK)  
 return FALSE; Xne{:!btw  
} KsZXdM/  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +we3BE.  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) p9*#{~   
 AddIcon(); jPG&Ypm1   
 return res; Q_<CG[,6D1  
} X( m&  
U0}]3a0  
void CCaptureDlg::AddIcon() 4%#C _pE9  
{ :cv_G;?  
 NOTIFYICONDATA data; P$MAURFm  
 data.cbSize=sizeof(NOTIFYICONDATA); Yrb[:;Y  
 CString tip; a =LjFpv/]  
 tip.LoadString(IDS_ICONTIP); rYI9?q  
 data.hIcon=GetIcon(0); LD]>_P83  
 data.hWnd=GetSafeHwnd(); 4u;db_gX  
 strcpy(data.szTip,tip); cX$ Pq  
 data.uCallbackMessage=IDM_SHELL; # [c`]v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \hSOJ,{)U  
 data.uID=98; ~2Jvb[IM  
 Shell_NotifyIcon(NIM_ADD,&data); p"Ki$.Y  
 ShowWindow(SW_HIDE); y:Ycn+X.  
 bTray=TRUE; o g.LD7&/  
} Fwn4c4-%  
wpw~[xd  
void CCaptureDlg::DeleteIcon() #8.%YG  
{ Snx_NH#tA  
 NOTIFYICONDATA data; I~lX53D  
 data.cbSize=sizeof(NOTIFYICONDATA); ]m0MbA  
 data.hWnd=GetSafeHwnd(); bg$df 0  
 data.uID=98; >SA?lG8f%  
 Shell_NotifyIcon(NIM_DELETE,&data); E]PHO\f-m}  
 ShowWindow(SW_SHOW); 7T \}nX1  
 SetForegroundWindow(); -P+( =U  
 ShowWindow(SW_SHOWNORMAL); Yn ZV.&4{  
 bTray=FALSE; !@E=\Sm8EV  
} x|/zn<\^  
?A7&SdJaO  
void CCaptureDlg::OnChange() p;av63 i  
{ "y@B|  
 RegisterHotkey(); |sWH!:]49  
} "7_6iB&@<  
/M>8ad  
BOOL CCaptureDlg::RegisterHotkey() M~Tq'>Fn  
{ <'H^}gQow  
 UpdateData(); #&vP(4p  
 UCHAR mask=0; xmz83Ll9  
 UCHAR key=0; S[!-M\b  
 if(m_bControl) VIo %((  
  mask|=4; 3{o5AsVv  
 if(m_bAlt) h amn9  
  mask|=2; <6k5nEh  
 if(m_bShift)  ol^J-  
  mask|=1; P@LYa_UFsN  
  key=Key_Table[m_Key.GetCurSel()]; V[>MKB(  
 if(bRegistered){ XBv:$F.>$  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); M/ @1;a@\  
  bRegistered=FALSE; yP\KIm!  
 } Ct[{>asun  
 cMask=mask; ^S*~<0NQ'  
 cKey=key; aNgaV$|2a  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); E )D*~2o/  
 return bRegistered; l ,0]iVJ  
} pv%UsbY  
e2|2$|  
  四、小结 f1F#U @U  
$5aRu,  
  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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