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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: #q`-"2"|  
  F\1{bN|3  
  一、实现方法 y}NBJ  
O=wA/T=w?  
  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: y99 3uP   
16q"A$  
#pragma data_seg("shareddata") ]=5nC)|  
HHOOK hHook =NULL; //钩子句柄 Do3;-yp>`  
UINT nHookCount =0; //挂接的程序数目 -\mbrbG9H  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 wIi_d6?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 2=pVX  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )*[3Imq/  
static int KeyCount =0; cC'{+j8-a  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ?zwPF;L*  
#pragma data_seg() KNtsz[#b  
nK*$P +[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。 l@-J&qG  
OSc&n>\t  
  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: s_} 1J,Y  
5Qb%g )jZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR }]cKOv2  
cKey,UCHAR cMask) `&2AN%Xz  
{ Y }*[Krw  
 BOOL bAdded=FALSE; T7E9l  
 for(int index=0;index<MAX_KEY;index++){ '2+Rb7V  
  if(hCallWnd[index]==0){ ve.rp F\  
   hCallWnd[index]=hWnd; [ F id  
   HotKey[index]=cKey; o,a 3J:j]  
   HotKeyMask[index]=cMask; Xrpzc~(  
   bAdded=TRUE; +R}(t{b#  
   KeyCount++; > <WR]`G  
   break; g0@i[&A@{  
  } KD]8n]c  
 } %a-:f)@  
 return bAdded; Jq1 Zb  
} }a= &o6=  
//删除热键 /`yb75  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) eJ0PSW/4l  
{ I13n mI\  
 BOOL bRemoved=FALSE; !Fa2F~#h  
 for(int index=0;index<MAX_KEY;index++){ }5#<`8  
  if(hCallWnd[index]==hWnd){ MW%EJT>@z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;Wjb}_V:_  
    hCallWnd[index]=NULL; IZ /Md@C  
    HotKey[index]=0; y"= j[.  
    HotKeyMask[index]=0; OA#AiQUR  
    bRemoved=TRUE; 1-C 2Y `  
    KeyCount--; KL]@y!QU  
    break; @C40H/dE  
   } ?`?"j<4e  
  } ;kO Op@e  
 } B6tp,Np5,  
 return bRemoved; 3rX5haD\  
} o ~"?K2@T  
8E`rs)A  
.%>UA|[~:  
  DLL中的钩子函数如下: Q8.SD p  
Q5'DV!0aSv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) oy90|.]G  
{ 3{o5AsVv  
 BOOL bProcessed=FALSE; +JE h7  
 if(HC_ACTION==nCode) <6k5nEh  
 { /I~iUND"G  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @A(*&PU>j  
   switch(wParam) 56(S[  
   {  =>".  
    case VK_MENU: 8 /Z  
     MaskBits&=~ALTBIT; @D%H-X  
     break; < \]o#w*:  
    case VK_CONTROL: aML?$_6  
     MaskBits&=~CTRLBIT; `A O_e4D0i  
     break; :Mr_/t2(  
    case VK_SHIFT: 3QSP](W-(  
     MaskBits&=~SHIFTBIT; yRaB\'  
     break; H:x=v4NgsU  
    default: //judge the key and send message b!VaEK  
     break; 9j458Yd4*  
   } E.kGBA;a?  
   for(int index=0;index<MAX_KEY;index++){ MH|!tkW>:  
    if(hCallWnd[index]==NULL) )24r^21.q  
     continue; `mV&[`NZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +5(#~  
    { (C/2shr 8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); DYlu`j_ux  
     bProcessed=TRUE; "`Q~rjc$2  
    } WXP=U^5Si  
   } ;RNU`I p  
  } qX[a\HQa  
  else if((lParam&0xc000ffff)==1){ //有键按下 der'<Q.U:k  
   switch(wParam) U CzIOxp}  
   { ?<c)r~9]  
    case VK_MENU: Y9fktg.  
     MaskBits|=ALTBIT; 8"R; axeD  
     break; \nM$qr'`B  
    case VK_CONTROL:  6jFc'  
     MaskBits|=CTRLBIT; CqQ>"Y  
     break; o9+ "6V|.  
    case VK_SHIFT: l@ vaupg  
     MaskBits|=SHIFTBIT; x_lCagRGC4  
     break; 4R-Y9:^t  
    default: //judge the key and send message ]Ga}+^  
     break; 8/X#thG  
   } q h;ahX~  
   for(int index=0;index<MAX_KEY;index++){ 4PUSFZK?  
    if(hCallWnd[index]==NULL) fMRBGcg7Dc  
     continue; 7!Z\B-_,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -MZ LkSU  
    { 6tXx--Nh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,w%cX{  
     bProcessed=TRUE; %(h-cuhq  
    } }MAvEaUd  
   } -miWXEe@l  
  } t3!?F(&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 YnC7e2  
   for(int index=0;index<MAX_KEY;index++){ We3Z#}X  
    if(hCallWnd[index]==NULL) Fl\X&6k  
     continue; Z3E957}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) FHWzwi*u}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T4n.C~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !$r4 lu  
   } a=bP   
  } ~`M>&E@Y_/  
 } \ } ,="  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); WvVHSa4{  
} .8[B }S(  
')%Kv`hz  
  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: %O-RhB4q  
e<s56<3j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1'tagv?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -:IG{3fnu  
dj,7lJy  
  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: ^b=]=w  
9B &QY 2v  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0MDdcjqw  
{ K r $R"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Rh#0EbE2  
 { AA&398F  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7Yp;B:5@  
  SaveBmp(); ro{q':Z3  
  return FALSE; 2Eg* Yb 1  
 } ;4<CnC**  
 …… //其它处理及默认处理 nHxos` Qx  
} 3In` !@EJ  
Ek\f x*Lz  
uJVu:E.#1  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 EacqQFErl  
i-oi?x<u&(  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 KfpDPwP@  
OU+oS,  
  二、编程步骤 PGZ.\i  
kb<Nuw  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; /5M@>A^?'  
9An_zrJ%i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; z-(@j;.  
GFd~..$  
  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; -AwR$<q'  
*xB9~:  
  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; ~I<yN`5(a  
]Cd 1&  
  5、 添加代码,编译运行程序。 c|q!C0X[  
@7 xb/&N  
三、程序代码 ldcYw@KQ  
}}Ah-QU  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ='f<_FD  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ]Hk8XT@Q+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ <4s$$Uw}6%  
#if _MSC_VER > 1000 OoOKr  
#pragma once 5 OR L  
#endif // _MSC_VER > 1000 !Irmc*;QE  
#ifndef __AFXWIN_H__ 9hG)9X4  
#error include 'stdafx.h' before including this file for PCH Sqj'2<~W  
#endif pVe@HJy6G  
#include "resource.h" // main symbols V&4)B &W  
class CHookApp : public CWinApp yP2[!vYw  
{ %m[ :},  
 public: :_v/a+\n  
  CHookApp(); O)C y4[  
  // Overrides rq'Cj<=Zj  
  // ClassWizard generated virtual function overrides "<b~pfCOQk  
  //{{AFX_VIRTUAL(CHookApp) hY=#_r8  
 public: .lrI|BH?z  
  virtual BOOL InitInstance(); cQEK>aAd  
  virtual int ExitInstance(); AP.WTFf  
  //}}AFX_VIRTUAL %0 (,f  
  //{{AFX_MSG(CHookApp) hPtSY'_@_  
  // NOTE - the ClassWizard will add and remove member functions here. w :2@@)pr  
  // DO NOT EDIT what you see in these blocks of generated code ! Sd?:+\bS;  
  //}}AFX_MSG \M^L'Mkj  
  DECLARE_MESSAGE_MAP() {`fhcEC  
}; i-!Z/,oL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); sxM0c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :Bc)1^ I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U085qKyCw  
BOOL InitHotkey(); +T:F :X`  
BOOL UnInit(); '9cShe  
#endif \IY)2C<e  
VyK]:n<5Q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5sui*WH  
#include "stdafx.h" 7m0sF<P{g  
#include "hook.h" 5`,qKJ  
#include <windowsx.h> I12WOL q  
#ifdef _DEBUG |,CWk|G  
#define new DEBUG_NEW ?,e7v.b  
#undef THIS_FILE c"R`7P  
static char THIS_FILE[] = __FILE__; c/.U<  
#endif N}x \Ll  
#define MAX_KEY 100 }8cL+JJU  
#define CTRLBIT 0x04 :3F&NsgHH  
#define ALTBIT 0x02 <;\T e4g[  
#define SHIFTBIT 0x01 J =o,: 3"  
#pragma data_seg("shareddata") K FV&Dt}<  
HHOOK hHook =NULL; lot7SXvK  
UINT nHookCount =0; m=i8o `  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey E>~DlL%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT {IEc{y7?gO  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey NN1d?cOn  
static int KeyCount =0; l1}=>V1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift %lPAq  
#pragma data_seg() _YzItge*  
HINSTANCE hins; tcOgF:  
void VerifyWindow(); F VW&&ft  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8 PI>Q  
//{{AFX_MSG_MAP(CHookApp) kQ4-W9u  
// NOTE - the ClassWizard will add and remove mapping macros here. j|3p.Cy  
// DO NOT EDIT what you see in these blocks of generated code! 9`4mvK/@  
//}}AFX_MSG_MAP H@0i}!U64  
END_MESSAGE_MAP() qk~ni8  
JmB7tRM8  
CHookApp::CHookApp() Lf_`8Ux  
{ `` (D01<  
 // TODO: add construction code here, 0/?V _  
 // Place all significant initialization in InitInstance o>x*_4[  
} @czNiWU"4;  
Q?Vq/3K;  
CHookApp theApp; +')\,m "z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) nxH=Ut7{  
{ {8D`A;KD  
 BOOL bProcessed=FALSE; -U;2 b_  
 if(HC_ACTION==nCode) uP bvN[~t  
 { Ut4cli&cC  
  if((lParam&0xc0000000)==0xc0000000){// Key up 5 {cbcuG  
   switch(wParam) <i34;`)b  
   { 4Z>KrFO  
    case VK_MENU: --E_s /   
     MaskBits&=~ALTBIT; 1~\YJEsb}d  
     break; =$3]%b}  
    case VK_CONTROL: 8Z{&b,Y4L  
     MaskBits&=~CTRLBIT; yVd}1bX  
     break; z zL@3/<j  
    case VK_SHIFT: R}lS@w1  
     MaskBits&=~SHIFTBIT; B-`d7c5  
     break; Dd8*1,  
    default: //judge the key and send message (xw)pR  
     break; 6|gC##T  
   } @,0W(  
   for(int index=0;index<MAX_KEY;index++){ W/COrgbW  
    if(hCallWnd[index]==NULL) c!l=09a~a+  
     continue; }$5S@,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W0%cJ8~  
    { @ht= (Jk9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); gj{2" tE  
     bProcessed=TRUE; o/273I  
    } MKIX(r( |  
   } \zioIfHm  
  } >Qg`Us#y  
  else if((lParam&0xc000ffff)==1){ //Key down jyRSe^x  
   switch(wParam) _bB:1l?V  
   { [5>f{L!<T<  
    case VK_MENU: `tKrTq>  
     MaskBits|=ALTBIT; =Tv;?U C  
     break; kGm-jh  
    case VK_CONTROL: *'D( j#&  
     MaskBits|=CTRLBIT; k2{*WF  
     break; "w}}q>P+sA  
    case VK_SHIFT: ?pq#|PI)  
     MaskBits|=SHIFTBIT; ^PDz"L<*  
     break; \x D.rBbt  
    default: //judge the key and send message \IB@*_G  
     break;  ,r\  
   } O ;,BzA-n  
   for(int index=0;index<MAX_KEY;index++) :%ms6j/B&V  
   { -0[?6.(s"  
    if(hCallWnd[index]==NULL) yn=BO`sgW  
     continue; @jb -u S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j} ^?3<  
    { E`68Z/%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,e\'Y!'  
     bProcessed=TRUE; .$nQD.X  
    } ! h7?Ap  
   } :t?Z  
  }  Er( I6  
  if(!bProcessed){ :l~^un|<2Y  
   for(int index=0;index<MAX_KEY;index++){ -Lh\]  
    if(hCallWnd[index]==NULL) UYJMW S=  
     continue; u0^Vy#@_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TC7&IqT  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); c^$_epc*  
   } LLE\;,bv  
  } x'dU[f(  
 } ;!H<W[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); R+vago:  
} i*-[-hn-V  
~,j52obR6Z  
BOOL InitHotkey() I =G3  
{ >2Z0XEe  
 if(hHook!=NULL){ Mrpz(})  
  nHookCount++; YC(7k7  
  return TRUE; pW{Q%"W  
 } M\4pTcz{  
 else SMX70T!'9  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); qPle=6U[IL  
  if(hHook!=NULL) MR$R#  
   nHookCount++; G i 1Jl"  
  return (hHook!=NULL); d.wu   
} )S41N^j.  
BOOL UnInit() ~<[$.8*  
{ byALM  
 if(nHookCount>1){ z4 GcS/3K  
  nHookCount--; )UBU|uYR\  
  return TRUE; 7.V'T=@x3)  
 } o< )"\f/,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); SrlTwcD  
 if(unhooked==TRUE){ 5Ii`|?vg  
  nHookCount=0; 1%Yd] 1c(  
  hHook=NULL; bYs K|n  
 } b,vSE,&xP  
 return unhooked; z?T;2/_7  
} 6T*MKu  
k@[\ C`P  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n=t50/jV3=  
{ |qUi9#NUo  
 BOOL bAdded=FALSE; mab921-n  
 for(int index=0;index<MAX_KEY;index++){ j1[Ng #.  
  if(hCallWnd[index]==0){ T22 4L.?  
   hCallWnd[index]=hWnd; ]O}TK^%  
   HotKey[index]=cKey; O9%`G  
   HotKeyMask[index]=cMask; N{/):O  
   bAdded=TRUE; zVEG ) Hr  
   KeyCount++; T'VZ=l[  
   break; &6 ymGo  
  } EI+RF{IKh  
 } Ep>} S  
 return bAdded; \#)|6w-  
} 0v7#vZ  
`<Ry_}V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EJAk'L+nuH  
{ S F:>dneB  
 BOOL bRemoved=FALSE; il8n K  
 for(int index=0;index<MAX_KEY;index++){ ,|5|aVfh  
  if(hCallWnd[index]==hWnd){ Ez()W,6]g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !U 6q;' )-  
    hCallWnd[index]=NULL; %5g(|Y]  
    HotKey[index]=0; S10"yhn(-t  
    HotKeyMask[index]=0; =&%}p[ 3g  
    bRemoved=TRUE; V47z;oMXct  
    KeyCount--; TH[xSg  
    break; AW{"9f4  
   } Gm`#0)VC  
  } }4Q~<2  
 } ]1Wh3C  
 return bRemoved; DxM$4  
} KM-d8^\:  
N.~zQVO#R  
void VerifyWindow() -hd@<+;E  
{ #BLx +mLq  
 for(int i=0;i<MAX_KEY;i++){ pL [JGn  
  if(hCallWnd!=NULL){ \&!qw[;O  
   if(!IsWindow(hCallWnd)){ .ei5+?V<i  
    hCallWnd=NULL; 2}\/_Y6  
    HotKey=0; 0|i3#G_~  
    HotKeyMask=0; jw 4B^2}  
    KeyCount--; WilKC|R]P  
   } I$0O4  
  } ?Yf0h_>  
 } mJU1n  
} 4Tdp;n\F  
]z77hcjB1  
BOOL CHookApp::InitInstance()  cFD3  
{ rp&XzMwC4  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <%Al(Lm0  
 hins=AfxGetInstanceHandle(); gJ=y7yX  
 InitHotkey(); * :kMv;9  
 return CWinApp::InitInstance(); EvP\;7B  
} 5^5hhm4  
\rpXG9  
int CHookApp::ExitInstance() ;2y4^  
{ J@}PBHK+  
 VerifyWindow(); aP ToP.e  
 UnInit(); c0ue[tb  
 return CWinApp::ExitInstance(); <q`'[1Y4  
} 7Gwo:s L  
5+DId7d'n  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]&;K:#J  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?-v]+<$Y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =w5]o@  
#if _MSC_VER > 1000 jk\z-hd  
#pragma once 0h-'TJg*sk  
#endif // _MSC_VER > 1000 fxQ4kiI  
`GUGy.b  
class CCaptureDlg : public CDialog "Snt~:W>  
{ GBY-WN4sc[  
 // Construction 0$g;O5y"i  
 public: 4JO[yN  
  BOOL bTray; XN&cM,   
  BOOL bRegistered; +\R__tx;  
  BOOL RegisterHotkey(); p![UOI"W  
  UCHAR cKey; |[_%zV;p>v  
  UCHAR cMask; X,A]<$ACu%  
  void DeleteIcon(); ]x(cX&S-9  
  void AddIcon(); /lS5B6NU  
  UINT nCount; }'p"q )  
  void SaveBmp(); %dwI;%0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor R>D[I.  
  // Dialog Data R wTzS;  
  //{{AFX_DATA(CCaptureDlg) <kCOg8<y :  
  enum { IDD = IDD_CAPTURE_DIALOG }; @P )2ZGG  
  CComboBox m_Key; Di"Tv<RlQ  
  BOOL m_bControl; koa-sy)#L  
  BOOL m_bAlt; yZV Y3<]  
  BOOL m_bShift; r"|UgCc  
  CString m_Path; 5AbY 59  
  CString m_Number; XiM d|D  
  //}}AFX_DATA Q?2Gw N  
  // ClassWizard generated virtual function overrides 8-"D.b4  
  //{{AFX_VIRTUAL(CCaptureDlg) HcQ)XJPK  
 public: QJy1j~9x  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2,6~;R  
 protected: #LR.1zZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9RPZj>ezjA  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ;(-Wc9=  
  //}}AFX_VIRTUAL tc0(G~.N  
  // Implementation $@HW|Y  
 protected: eg1Mdg\a  
  HICON m_hIcon; FnPn#Cv>*  
  // Generated message map functions U4N H9-U'  
  //{{AFX_MSG(CCaptureDlg) zRMz8IC.  
  virtual BOOL OnInitDialog(); #62*'.B4  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Cq -URih  
  afx_msg void OnPaint(); wq7h8Z}l  
  afx_msg HCURSOR OnQueryDragIcon(); V!Pe%.>  
  virtual void OnCancel(); @u @,Edh  
  afx_msg void OnAbout(); u]*f^/6Q  
  afx_msg void OnBrowse(); l@0${&n  
  afx_msg void OnChange(); Vq599M:)V  
 //}}AFX_MSG xOx=Z\ c  
 DECLARE_MESSAGE_MAP() Dk Ef;P  
}; 0|DyYu  
#endif fcTg/EXn  
&u!MI  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file jcp6-XM  
#include "stdafx.h" 25j?0P"&  
#include "Capture.h" t)5.m}  
#include "CaptureDlg.h" if?X^j0  
#include <windowsx.h> e>m+@4*sn  
#pragma comment(lib,"hook.lib") t$3B#=  
#ifdef _DEBUG wBJ|%mc3TA  
#define new DEBUG_NEW R"y xpw  
#undef THIS_FILE \fsNI T/  
static char THIS_FILE[] = __FILE__; rvacCwI  
#endif P(UY}oU  
#define IDM_SHELL WM_USER+1 +G6 Ge;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); CofTTYl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3a[LM!  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; dZY|6  
class CAboutDlg : public CDialog rJ{k1H>  
{ Kk,u{EA  
 public: R=3|(R+kA  
  CAboutDlg(); +K s3  
  // Dialog Data |\Q2L;4C  
  //{{AFX_DATA(CAboutDlg) {PkR6.XhR  
  enum { IDD = IDD_ABOUTBOX }; q|}O-A*wa  
  //}}AFX_DATA <TTBIXV  
  // ClassWizard generated virtual function overrides A34O(fE  
  //{{AFX_VIRTUAL(CAboutDlg) !sp`oM  
 protected: q"5\bh1"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 'ka}x~EF  
  //}}AFX_VIRTUAL :NL[NbQYt  
  // Implementation ?[|A sw1t  
 protected: "(iDUl  
  //{{AFX_MSG(CAboutDlg)  au]W*;x  
  //}}AFX_MSG $:yIe.F  
  DECLARE_MESSAGE_MAP() vJ{F)0 K  
}; F1S0C>N?5  
1(pv 3  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) rp4{lHw>C/  
{ aCJ-T8?'  
 //{{AFX_DATA_INIT(CAboutDlg) @ULd~  
 //}}AFX_DATA_INIT (-],VB (+  
} IR{XL\WF  
[ahwJF#r  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) K_n GZ/`[  
{  9I:3  
 CDialog::DoDataExchange(pDX); 3mHP=)  
 //{{AFX_DATA_MAP(CAboutDlg) lvRTy|%[  
 //}}AFX_DATA_MAP j]U~ZAn,K  
} wv`ar>qVL  
b%KcS&-6  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) oWx^_wQ-=  
 //{{AFX_MSG_MAP(CAboutDlg) Av0(zA2  
 // No message handlers Rt7l`|g a+  
 //}}AFX_MSG_MAP (Y*9 [hm  
END_MESSAGE_MAP() -Mf-8zw8G  
^oYRB EIJH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 6XHM`S  
: CDialog(CCaptureDlg::IDD, pParent) 0Y'ow=8M  
{ `t\\O  
 //{{AFX_DATA_INIT(CCaptureDlg) AiL80W^=d)  
  m_bControl = FALSE; iJeo d fC  
  m_bAlt = FALSE; s)?GscPG!  
  m_bShift = FALSE; /6F\]JwU  
  m_Path = _T("c:\\"); 7[mP@ {  
  m_Number = _T("0 picture captured."); U%0|LQk5  
  nCount=0; Xy./1`X  
  bRegistered=FALSE; i&p6UU  
  bTray=FALSE; z7z9lDS  
 //}}AFX_DATA_INIT ,@fx[5{  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 j;qV+Rq]t  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);  7PuYrJ  
} ESk:$`P  
$E!f@L  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) LqO=wK~  
{ c^cr_ i  
 CDialog::DoDataExchange(pDX); `Z#':0Z  
 //{{AFX_DATA_MAP(CCaptureDlg) /MMnW$)  
  DDX_Control(pDX, IDC_KEY, m_Key); #C'E'g0  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *VH Wvj  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A^$xE6t  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >JA>np  
  DDX_Text(pDX, IDC_PATH, m_Path); ujl ?!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); vRn]u57O  
 //}}AFX_DATA_MAP M]M>z>1*v  
} y\4/M6  
7SN61)[m  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) x3( ->?)D  
//{{AFX_MSG_MAP(CCaptureDlg) Tm9sQ7Oj(  
 ON_WM_SYSCOMMAND() ?`xm_udc  
 ON_WM_PAINT() zk!7TUZ">w  
 ON_WM_QUERYDRAGICON() %"=GQ3u[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) o~W,VhCP  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) GY %$7   
 ON_BN_CLICKED(ID_CHANGE, OnChange)  ;q5|If  
//}}AFX_MSG_MAP H|7XfM  
END_MESSAGE_MAP() *_d N9  
x4MTE?hT  
BOOL CCaptureDlg::OnInitDialog() 4<vi@,s  
{ I(WIT=Wi<  
 CDialog::OnInitDialog(); Y@< j vH1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =}@1Z~  
 ASSERT(IDM_ABOUTBOX < 0xF000); %!AzFL J|Z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Vugb;5Vl  
 if (pSysMenu != NULL) V rd16s  
 { uix/O*^  
  CString strAboutMenu; kma>'P`G  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,L.V>Ae  
  if (!strAboutMenu.IsEmpty()) _"OE}$C  
  { '/OQ[f=K  
   pSysMenu->AppendMenu(MF_SEPARATOR); @Kn@j D;  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); yTn<5T[H  
  } ^16zZ*  
 } R#.H&#  
 SetIcon(m_hIcon, TRUE); // Set big icon e2K9CE.O  
 SetIcon(m_hIcon, FALSE); // Set small icon RnU7|p{  
 m_Key.SetCurSel(0); FA;-D5=  
 RegisterHotkey(); T$AVMVq  
 CMenu* pMenu=GetSystemMenu(FALSE); A0RSNAM  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); FzP1b_i  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2`%a[t@M.  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hg:$H9\%  
 return TRUE; // return TRUE unless you set the focus to a control eX lJ=S}  
} *W^a<Zm8>  
g HkHAOe/  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ?Bl/bY$*h  
{ H'7s`^- >I  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ()w;~$J  
 { `S5::U6E  
  CAboutDlg dlgAbout; {]Cn@.TPD  
  dlgAbout.DoModal(); Vp0_R9oQ  
 } }~NXiUe  
 else ^nNpT!o  
 { I.(@#v7T  
  CDialog::OnSysCommand(nID, lParam); |W$|og'wC  
 } 61_-G#W  
} c53:E'g  
cH4 PrMm&  
void CCaptureDlg::OnPaint() WRAL/  
{ _%Ua8bR$  
 if (IsIconic()) OB\ZT@l  
 { ]h&1|j1  
  CPaintDC dc(this); // device context for painting 1 ?Zw  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); kM1N4N7  
  // Center icon in client rectangle Cz$q"U  
  int cxIcon = GetSystemMetrics(SM_CXICON); Lfdg5D5.P  
  int cyIcon = GetSystemMetrics(SM_CYICON); ij~-  
  CRect rect; CWRB/WH:  
  GetClientRect(&rect);  +Mhk<A[s  
  int x = (rect.Width() - cxIcon + 1) / 2; %W2U$I5  
  int y = (rect.Height() - cyIcon + 1) / 2; f [.'V1  
  // Draw the icon RLL%l  
  dc.DrawIcon(x, y, m_hIcon); A%7f;&x!  
 } hW/Ve'x[  
 else (i1x<  
 { WHOX<YJs  
  CDialog::OnPaint(); "frioi`a2  
 } -^(KGu&L&u  
} ='=4tj=z  
'1xhP}'3)  
HCURSOR CCaptureDlg::OnQueryDragIcon() 7fO<=ei:  
{ 6,M$TA  
 return (HCURSOR) m_hIcon; L<3+D  
} ,6pGKCUU:y  
[^bq?w  
void CCaptureDlg::OnCancel() JR xY#k  
{ \=[j9'N>  
 if(bTray) @D=%J!!*  
  DeleteIcon(); <1Sj_HCT  
  CDialog::OnCancel(); /988K-5k  
} '6e4rn{  
)G?\{n-  
void CCaptureDlg::OnAbout() 98O]tL+k/u  
{ GCiG50Z=  
 CAboutDlg dlg; SdYb T)y  
 dlg.DoModal(); WiB~sIp  
} sQ^t8Y 9  
s :BW}PM  
void CCaptureDlg::OnBrowse() %G,7Ul1f  
{ :) -`  
 CString str; zS|4@t\__  
 BROWSEINFO bi; Fj2z$   
 char name[MAX_PATH]; cQ1Axs TO  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -$:*!55:j  
 bi.hwndOwner=GetSafeHwnd();  ;Ss!OFK  
 bi.pszDisplayName=name; /\uopa  
 bi.lpszTitle="Select folder"; 'UxI-L t  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /Z!$bD  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); jb,a>9 ]p  
 if(idl==NULL) 0'.z|Jg=  
  return; }o7-3!{L!  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O"EL3$9V  
 str.ReleaseBuffer(); #1\`!7TO3  
 m_Path=str; Bos} `S![  
 if(str.GetAt(str.GetLength()-1)!='\\') L(u@%.S  
  m_Path+="\\"; IGVq`Mxj  
 UpdateData(FALSE); 1cMLl6Bp>  
} =EM<LjO  
oYA"8ei=  
void CCaptureDlg::SaveBmp() g\8B;  
{ 5}Ge  
 CDC dc; ^ <`SUBI  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8!3q:8y8  
 CBitmap bm; OHj>ufwVq  
 int Width=GetSystemMetrics(SM_CXSCREEN); ZI qXkD  
 int Height=GetSystemMetrics(SM_CYSCREEN); *{j;LA.BR#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); <Opw"yY&q]  
 CDC tdc; (|o @  
 tdc.CreateCompatibleDC(&dc); \lQI;b;$  
 CBitmap*pOld=tdc.SelectObject(&bm); do.>Y}d  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ::iYydpM  
 tdc.SelectObject(pOld); 4F0w+w JD  
 BITMAP btm; 7UG c2J  
 bm.GetBitmap(&btm); 77sG;8HE  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; vO&X<5?Qc  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); W94u7a  
 BITMAPINFOHEADER bih; OPE+:TvW^  
 bih.biBitCount=btm.bmBitsPixel; bp}97ZQ  
 bih.biClrImportant=0; `Npo|.?=  
 bih.biClrUsed=0; bma.RCyY<  
 bih.biCompression=0; 3+d^Bpp4  
 bih.biHeight=btm.bmHeight; P]y{3y:XxM  
 bih.biPlanes=1; RMpiwO^  
 bih.biSize=sizeof(BITMAPINFOHEADER); =_iYT044p  
 bih.biSizeImage=size; QRKP;aYt  
 bih.biWidth=btm.bmWidth; <T)0I1S  
 bih.biXPelsPerMeter=0; E'D16Rhp  
 bih.biYPelsPerMeter=0; &{glwVKV  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); R@NFpiw  
 static int filecount=0; Z:>3AJuS_  
 CString name; ~"vS$>+  
 name.Format("pict%04d.bmp",filecount++); 'nh2}  
 name=m_Path+name; NF4(+E9g  
 BITMAPFILEHEADER bfh; s5+;8u9K  
 bfh.bfReserved1=bfh.bfReserved2=0; ~vA8I#.  
 bfh.bfType=((WORD)('M'<< 8)|'B'); KU{zzn;g  
 bfh.bfSize=54+size; sb3z8:r  
 bfh.bfOffBits=54; `MCtm(<  
 CFile bf; zDtC]y'  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ >R6mI  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zA+0jhuG  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); gg^iYTpt  
  bf.WriteHuge(lpData,size); .E+O,@?<  
  bf.Close(); /ar0K9`c  
  nCount++; C@t,oDU#  
 } yih|6sd$F  
 GlobalFreePtr(lpData); 2Og5e  
 if(nCount==1) ,xrA2  
  m_Number.Format("%d picture captured.",nCount); cT@| $A  
 else L>E;cDB  
  m_Number.Format("%d pictures captured.",nCount); \?Z7|   
  UpdateData(FALSE); 1pG|jT+Bi  
} dZf1iFCP  
S#oBO%!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }1[s,  
{ /U!B2%vq_  
 if(pMsg -> message == WM_KEYDOWN) 8d8jUPFQ  
 { _=`DzudE  
  if(pMsg -> wParam == VK_ESCAPE) 3X;>cv#B  
   return TRUE; _%Xp2`m  
  if(pMsg -> wParam == VK_RETURN) -zJ V(`  
   return TRUE; nHDKe )V  
 } D4y!l~_,%M  
 return CDialog::PreTranslateMessage(pMsg); X )Tyxppf'  
} +e*C`uP!  
/=AFle2(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3)o>sp)Ji$  
{ [.xc`CF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ SB('Nqih  
  SaveBmp(); 6)ZaK  
  return FALSE; 0F_hXy@K  
} sKKc_H3YSH  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ V9Mr&8{S4  
 CMenu pop; ;r6YIS4@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;~$Q;m 1  
 CMenu*pMenu=pop.GetSubMenu(0); "x$L 2>9  
 pMenu->SetDefaultItem(ID_EXITICON); M[O22wFs  
 CPoint pt; LE5N2k  
 GetCursorPos(&pt); :%Iv<d<  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); J"GsdLG.-  
 if(id==ID_EXITICON) qc)+T_m  
  DeleteIcon(); tl*v(ZW  
 else if(id==ID_EXIT) \h s7>5O^K  
  OnCancel(); n{~&^Nby*I  
 return FALSE; {jR3D!hK  
} eNi#% ?=WB  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Q<MxbHk9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "M2WK6?O5  
 AddIcon(); *\}$,/m['  
 return res; 6|n3Q$p  
} k'&1,78[l  
mC\<fo-u  
void CCaptureDlg::AddIcon() ?6ssSjR}  
{ (6mw@gzr  
 NOTIFYICONDATA data; VSCKWYy  
 data.cbSize=sizeof(NOTIFYICONDATA); mAW(j@5sp  
 CString tip; lf KV%  
 tip.LoadString(IDS_ICONTIP); _dAn/rj   
 data.hIcon=GetIcon(0); L8'4d'N+ >  
 data.hWnd=GetSafeHwnd(); dxZn| Y  
 strcpy(data.szTip,tip); 4Wa$>vz  
 data.uCallbackMessage=IDM_SHELL; TxN+-< f  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; L[Y$ `e{zd  
 data.uID=98; zPHx\z"  
 Shell_NotifyIcon(NIM_ADD,&data); i,Z-UA|f=T  
 ShowWindow(SW_HIDE); ;O~FiA~`c  
 bTray=TRUE; >0 o[@gJl  
} s?1Aj<  
hv>Xr=RE  
void CCaptureDlg::DeleteIcon() %" mki>  
{ lWJYT <kt  
 NOTIFYICONDATA data; *0L3#. i  
 data.cbSize=sizeof(NOTIFYICONDATA); `}uM91;  
 data.hWnd=GetSafeHwnd(); }uaFmXy3  
 data.uID=98; e?07o!7[;  
 Shell_NotifyIcon(NIM_DELETE,&data); y0O e)oP  
 ShowWindow(SW_SHOW); %G6x\[,  
 SetForegroundWindow(); ?y>v"1+  
 ShowWindow(SW_SHOWNORMAL); vmOye/?k  
 bTray=FALSE; 0;=]MEk?  
} 47*2QL^zj  
E#tfCM6  
void CCaptureDlg::OnChange() &6Lh>n(  
{ +"WNG  
 RegisterHotkey(); A(BjU:D(Oj  
} ?aBAmyxm  
[5-Ik T0  
BOOL CCaptureDlg::RegisterHotkey() g26_#4 P  
{ 7J$rA.tu  
 UpdateData(); (M{wkQTO  
 UCHAR mask=0; |d6/gSiF  
 UCHAR key=0; ;O,&MR{;|n  
 if(m_bControl) ;H71A[M T  
  mask|=4; |FlB#  
 if(m_bAlt) RhF< {U.  
  mask|=2; mKV31wvK}  
 if(m_bShift) `O.pT{Lf  
  mask|=1; .),9a,  
  key=Key_Table[m_Key.GetCurSel()]; 'zMmJl}\vd  
 if(bRegistered){ F/tRyq`D  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Wie0r@5E  
  bRegistered=FALSE; F8tMZ,:  
 } .ty2! .  
 cMask=mask; 5RO6YxQ  
 cKey=key; ).u>%4=6  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); XPt>klf  
 return bRegistered; H D$`ZV  
} A93(} V7I  
{LqYb:/C5U  
  四、小结 tId,Q>zH  
lq`7$7-4  
  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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