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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: s>B5l2Q4  
  V, Z|tB^  
  一、实现方法 s1M Erd  
,~aQL  
  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: [;r)9mh7  
1t:Q_j0Ym  
#pragma data_seg("shareddata") ;kFDMuuO  
HHOOK hHook =NULL; //钩子句柄 *;l]8.  
UINT nHookCount =0; //挂接的程序数目 ^nT/i .#_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 p#01gB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 S@jQX  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey K,Ef9c/+K  
static int KeyCount =0; :8L8q<U  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 <6EeD5{*  
#pragma data_seg() :By?O"LQ  
L6t+zIUc-~  
  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。 Lz`E;k^  
\s/s7y6b+  
  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: oiF}?:7Q7  
0ZT5bg_M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR MuYk};f  
cKey,UCHAR cMask) .GsV>H  
{ m;H.#^b*  
 BOOL bAdded=FALSE; X@$f$=  
 for(int index=0;index<MAX_KEY;index++){ j2Cks_$:  
  if(hCallWnd[index]==0){ n G,A@/N  
   hCallWnd[index]=hWnd; 49rf7NT-g  
   HotKey[index]=cKey; X}=n:Ql'YY  
   HotKeyMask[index]=cMask; ^`*9QjY  
   bAdded=TRUE; 3)F |*F3R  
   KeyCount++; =!kk|_0%E  
   break; W^0w  
  } nim*/LC[:  
 } 3p3 9`"~  
 return bAdded; ~k\fhx  
} zjJ *n8l  
//删除热键 =[H;orMr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6TQoqH8@U  
{ &R[ M c-2  
 BOOL bRemoved=FALSE; -d~4A  
 for(int index=0;index<MAX_KEY;index++){ ?^H `M|S  
  if(hCallWnd[index]==hWnd){ _g+JA3sIJ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -l`f)0{  
    hCallWnd[index]=NULL; "oTHq]Ku  
    HotKey[index]=0; vL|SY_:4  
    HotKeyMask[index]=0; Keuf9u  
    bRemoved=TRUE; di?K"Z>  
    KeyCount--; =+/eLKG  
    break; t#Z-mv:(  
   } aDq5C-MzG  
  } &qMPq->  
 } T?:Rdo!:u  
 return bRemoved; ql<i]Y  
} ~?D4[D|sB  
{\S+#W\  
bHPYp5UwN  
  DLL中的钩子函数如下: NMW#AZVd  
@E^~$-J5j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) W 0(_ ~  
{ :?k>HQe  
 BOOL bProcessed=FALSE; 2>|dF~"  
 if(HC_ACTION==nCode) `NnUyQ;T  
 { *v;!-F&8>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Fw/6?:C}O6  
   switch(wParam) k >F'ypm  
   {  6o |kIBte-  
    case VK_MENU: g'p K  
     MaskBits&=~ALTBIT; s8QM ewU  
     break; Q~814P8]  
    case VK_CONTROL: P7J>+cm  
     MaskBits&=~CTRLBIT;  :l~ I  
     break; #hW;Ju73  
    case VK_SHIFT: kQ4dwF~  
     MaskBits&=~SHIFTBIT; ~3UQ|j  
     break; {p)",)td  
    default: //judge the key and send message &J55P]7w  
     break; pwO>h>ik  
   } CEXyrs<  
   for(int index=0;index<MAX_KEY;index++){ 3b*cU}go  
    if(hCallWnd[index]==NULL) &Flglj~7l  
     continue; e8y;.D[2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~hZ"2$(0  
    { oE<`VY|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Wc,_RN-  
     bProcessed=TRUE; *7*lE"$p  
    } x1Lb*3Fe  
   } LG-y]4a}  
  } ICuF %  
  else if((lParam&0xc000ffff)==1){ //有键按下 P1zKsY,l$<  
   switch(wParam) rW0kA1=E  
   { 3j,Q`+l/6d  
    case VK_MENU: A54N\x,  
     MaskBits|=ALTBIT; 6S\C}U/   
     break; >C7r:%  
    case VK_CONTROL: Cnnh7`  
     MaskBits|=CTRLBIT; 5 elw~u  
     break; #?5 (o  
    case VK_SHIFT: U3 */v4/  
     MaskBits|=SHIFTBIT; @*}D$}aR'V  
     break; qgE 73.!`6  
    default: //judge the key and send message wDcj,:h`  
     break; 4S,`bnmB  
   } ^cV;~&|.Xk  
   for(int index=0;index<MAX_KEY;index++){ [!!o-9b  
    if(hCallWnd[index]==NULL) if}-_E<F  
     continue; VK}fsOnj0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QN@CPuy  
    { 0="%Y ^N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &?VQ,+[ <  
     bProcessed=TRUE; tDSJpW'd  
    } kV?y0J.  
   } 9w"h  
  } M>DaQ`b  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 E8>Ru i@9  
   for(int index=0;index<MAX_KEY;index++){ 6726ac{xz  
    if(hCallWnd[index]==NULL) .nG#co"r}3  
     continue; i\1TOP|h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) T~QWRBO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9!T[Z/}T  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *j]9vktH  
   } X'%E\/~u  
  } M9EfU  
 } 9U{a{~b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Dpvk\t  
} @[5xq  
m6n?bEl6I  
  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: wm]^3q I2  
MG[o%I96  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Vm%1> '&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $P>`m$(8  
szsk;a  
  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: 7#@cz5Su  
S?RN?1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N*%@  
{ j]*j}%hz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 5Ycco,x  
 { iOwx0GD.n  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 n.wF&f'D]  
  SaveBmp(); HOw -]JSP2  
  return FALSE; m0LTx\w!  
 } 8d?g]DEN)6  
 …… //其它处理及默认处理 "5;;)\o ~  
} ?z}=B  
hZh9uI7.  
n9@ of  
  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。 f~Fm4 >\(  
x\F,SEj  
  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。 b|cyjDMAA  
20vXSYa~  
  二、编程步骤 ]d,S749(s  
>2~+.WePu  
  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"; 350_CN,  
u`y><w4i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; J\d3N7_d  
MxSM@3v(  
  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; )ap_Z6  
3= xhoRX  
  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; /V8}eZ97  
':gUOra|I  
  5、 添加代码,编译运行程序。 F_Y7@Ei/  
hQ]H /+\  
三、程序代码 JAAI_gSR3  
1"/He ` 4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  yyv8gH  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) I *x[:)X8  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Jj,U RD&0R  
#if _MSC_VER > 1000 Gqcq,_?gt  
#pragma once !,[C] Q1  
#endif // _MSC_VER > 1000 qtiz a~u  
#ifndef __AFXWIN_H__ 4!+pc-}-  
#error include 'stdafx.h' before including this file for PCH _/Gczy4)#  
#endif 6:q"l\n>  
#include "resource.h" // main symbols h.-@ F  
class CHookApp : public CWinApp ~.A)bp  
{ 5O~HWBX.  
 public: e?_@aa9~@{  
  CHookApp(); 70f Klp  
  // Overrides ]Tkc-ez  
  // ClassWizard generated virtual function overrides N-I5X2  
  //{{AFX_VIRTUAL(CHookApp) JL\w_v  
 public: 5m?8yT}  
  virtual BOOL InitInstance(); 8'<-:KG  
  virtual int ExitInstance(); )t$,e2FY  
  //}}AFX_VIRTUAL w4W_iaU  
  //{{AFX_MSG(CHookApp) v z^<YZMu  
  // NOTE - the ClassWizard will add and remove member functions here. q-]`CW]n  
  // DO NOT EDIT what you see in these blocks of generated code ! Ggl~nxz  
  //}}AFX_MSG ,Y|^^?'j Q  
  DECLARE_MESSAGE_MAP() Y2d;E.DH8  
}; .q[SI$qO/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); uHAT#\m:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "*LD 3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bHg,1y)UC  
BOOL InitHotkey(); dFH$l  
BOOL UnInit(); Fx5d:!]:$?  
#endif 8<.C3m 6h  
F;gx%[$GX  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. KN7^:cC  
#include "stdafx.h" K$M^gh0  
#include "hook.h" l5\"9 ,<  
#include <windowsx.h> UNPezHaz  
#ifdef _DEBUG 2zVJvn7  
#define new DEBUG_NEW Bn61AFy`  
#undef THIS_FILE ,hq)1u  
static char THIS_FILE[] = __FILE__; ua5OGx  
#endif Kv.>Vf.T}_  
#define MAX_KEY 100 ]4R[<<hd  
#define CTRLBIT 0x04 q4}PM[K?=\  
#define ALTBIT 0x02 \e!vj.PU  
#define SHIFTBIT 0x01 fO0(Z  
#pragma data_seg("shareddata") OfctoPP _0  
HHOOK hHook =NULL; usEwm,b)  
UINT nHookCount =0; 0PU8 #2pR  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 9cEv&3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT aYuD>rD  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey OiE;B  
static int KeyCount =0; TjHwjRa  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ,0E{h}(  
#pragma data_seg() ZQ_xDKqRV  
HINSTANCE hins; 3}@_hS"^8  
void VerifyWindow(); iCW*]U  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 6oLwfTy  
//{{AFX_MSG_MAP(CHookApp) (9<guv  
// NOTE - the ClassWizard will add and remove mapping macros here. b&=5m  
// DO NOT EDIT what you see in these blocks of generated code! wk6NG/<  
//}}AFX_MSG_MAP ;9~6_@,@o  
END_MESSAGE_MAP() mp9{m`Jb*  
G:pEE:W[  
CHookApp::CHookApp() h$.:Uj8/  
{ 9lGOWRxR)  
 // TODO: add construction code here, N\HQN0d9  
 // Place all significant initialization in InitInstance tID%}Zv  
} abJ" [  
AJSx%?h:6  
CHookApp theApp; Qb)C[5a}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HsnLm67'  
{ ]d a^xWK  
 BOOL bProcessed=FALSE; INkD=tX  
 if(HC_ACTION==nCode) lu#LCG-.  
 { ={5#fgK>  
  if((lParam&0xc0000000)==0xc0000000){// Key up )(tM/r4`c&  
   switch(wParam) TQ`Rk;0R  
   { '=1KVE^Fk  
    case VK_MENU: Q %wY  
     MaskBits&=~ALTBIT; {_Lg tu  
     break; /v/C<]  
    case VK_CONTROL: H"C[&r  
     MaskBits&=~CTRLBIT; e.@uhB.  
     break; `.T}=j|  
    case VK_SHIFT: 8}fu,$$5  
     MaskBits&=~SHIFTBIT; 05snuNt]-  
     break; Ux#x#N  
    default: //judge the key and send message Qt,M!i,  
     break; `ORECg)  
   } e"'#\tSG  
   for(int index=0;index<MAX_KEY;index++){ C_4)=#@GU  
    if(hCallWnd[index]==NULL) B*~5)}1op  
     continue; NvHJ3>"%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :.?gHF.?  
    { Pt&(npjN,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4'6`Ll|iq  
     bProcessed=TRUE; o99pHW(E  
    } WBNw~|DO]  
   } >0dv+8Mn  
  } M/q E2L[y  
  else if((lParam&0xc000ffff)==1){ //Key down MY/3] g<  
   switch(wParam) Zum0J{l h  
   { {5d9$v7k4  
    case VK_MENU: Xe#K{gA  
     MaskBits|=ALTBIT; 5w\fSY  
     break; 52b*[tZ  
    case VK_CONTROL: K{ \;2M  
     MaskBits|=CTRLBIT; `E!N9qI?t$  
     break; <)\y#N  
    case VK_SHIFT: 7lS#f1E  
     MaskBits|=SHIFTBIT; G NS`.fS  
     break; {@<J_ A  
    default: //judge the key and send message &f7fK|}  
     break; Fe.t/amS/  
   } ;U<rc'qE  
   for(int index=0;index<MAX_KEY;index++) Iw<jT|y)  
   { @^;j)%F}  
    if(hCallWnd[index]==NULL) rz"txN  
     continue; w|CZ7|6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M.nvB)  
    { RGn!{=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); kKPi:G52F  
     bProcessed=TRUE; W`"uu.~f  
    } +uBLk0/)>  
   } "wlt> SU  
  }  f>s?4  
  if(!bProcessed){ I+!:K|^  
   for(int index=0;index<MAX_KEY;index++){ ?H_ LX;r  
    if(hCallWnd[index]==NULL) >yXN,5d[  
     continue; 2P]L9'N{Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <H0R&l\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `'\t$nU  
   } `xz<>g9e  
  } hXb%;GL  
 } Qfky_5R\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4J?t_)  
} Y3h/~bM%  
Qj3a_p$)P  
BOOL InitHotkey() xl"HotsX-x  
{ h'$QC )P  
 if(hHook!=NULL){ ifo7%XPcg  
  nHookCount++; 5OO'v07b  
  return TRUE; RJy=pNztm  
 } VR  
 else ]r3Kg12Mi  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); S}f?.7  
  if(hHook!=NULL) =C L} $_  
   nHookCount++; 2o#,kGd  
  return (hHook!=NULL); 4O:W#bx  
} |A%<Z(  
BOOL UnInit() :QWq"cBem  
{ xr7+$:>a  
 if(nHookCount>1){ <" @zn  
  nHookCount--; vsL[*OeI  
  return TRUE; x Au/  
 } ,v&L:a  
 BOOL unhooked = UnhookWindowsHookEx(hHook); W5^.-B,(K  
 if(unhooked==TRUE){ ~+<olss_  
  nHookCount=0; {V1Pp;A  
  hHook=NULL; BC,.^"fA6  
 } t+?P^Ok  
 return unhooked; T~fmk f$  
} %+ FG,d  
[>^PRs  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a=XW[TY1  
{ hk/! 'd  
 BOOL bAdded=FALSE; 1xU3#b&2tC  
 for(int index=0;index<MAX_KEY;index++){ 6{ ,HiY  
  if(hCallWnd[index]==0){ SlSM+F  
   hCallWnd[index]=hWnd; k|BHnj  
   HotKey[index]=cKey; vA)O {W\o  
   HotKeyMask[index]=cMask; k8,?hX:  
   bAdded=TRUE; w_ {,<[#  
   KeyCount++; ~Ph\Sbp  
   break; 0aoHKeP  
  } v+e|o:o#  
 } 9S[XTU  
 return bAdded; >a1{397Y}  
} _5MNMV LwW  
\v6 M:KR5/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l%Gw_0.?e  
{ AF43$6KZP$  
 BOOL bRemoved=FALSE; ubu?S%`  
 for(int index=0;index<MAX_KEY;index++){ &TG5rUUg  
  if(hCallWnd[index]==hWnd){ 7O`o ovW$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ](eN@Xi&@  
    hCallWnd[index]=NULL; |3+m%;X  
    HotKey[index]=0; 83cW=?UgA  
    HotKeyMask[index]=0; .D4bqL  
    bRemoved=TRUE; >xA),^ YT  
    KeyCount--; W$qd/'%  
    break; DFO7uw1  
   } ]APvp.Tw:  
  } dr{y0`CCN  
 } -[OXSaf6  
 return bRemoved; Omi^>c4G  
} fWF |,A>>b  
51# "3S  
void VerifyWindow() &x-TW,#Ks  
{ ~|wos-nM  
 for(int i=0;i<MAX_KEY;i++){ i)Lp7m z  
  if(hCallWnd!=NULL){ [!^-J}^g~\  
   if(!IsWindow(hCallWnd)){  q{die[J  
    hCallWnd=NULL; *2}O-e  
    HotKey=0; ;eigOU]  
    HotKeyMask=0; eQO#Qso]  
    KeyCount--; s7r9,8$  
   } ;nmM7TZ;  
  } l{ex?  
 } M}0eu(_|  
} M,3wmW&d6  
FFEfp.T1M  
BOOL CHookApp::InitInstance() hNXBVIL<&  
{  ==/n(LBD  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); $jI>[%  
 hins=AfxGetInstanceHandle(); TP1S[`nR  
 InitHotkey(); 8u2+tB  
 return CWinApp::InitInstance();  n i  
} aFY_:.o2k`  
O3n_N6| q  
int CHookApp::ExitInstance() (#q<\`  
{ )a=/8ofe  
 VerifyWindow(); ^D@b;EyK  
 UnInit(); ig0u^BC  
 return CWinApp::ExitInstance(); Q36)7=at  
} iA!7E;o  
{dPgf  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]WJfgN4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) . BO<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ PiLJZBUv  
#if _MSC_VER > 1000 5 / m$)wE  
#pragma once <-UOISyf  
#endif // _MSC_VER > 1000 J NC  
n,P5o_^:  
class CCaptureDlg : public CDialog iy\KzoB  
{  17hTr  
 // Construction d~ng6pA  
 public: nY `2uN~9  
  BOOL bTray; #>@z 2K7  
  BOOL bRegistered; 5;)*T6Y  
  BOOL RegisterHotkey(); %'L;FPxB  
  UCHAR cKey; AF4?IH  
  UCHAR cMask; A1cb"N^  
  void DeleteIcon(); =QV ::/  
  void AddIcon(); &[?CTZ  
  UINT nCount; +c206.  
  void SaveBmp(); 6S?x D5 (  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor OySy6IN]q  
  // Dialog Data _-cK{  
  //{{AFX_DATA(CCaptureDlg) ,7|;k2  
  enum { IDD = IDD_CAPTURE_DIALOG }; < /p 8r  
  CComboBox m_Key; Mo|wME#M  
  BOOL m_bControl; v4*rPGv  
  BOOL m_bAlt; % U`xu.  
  BOOL m_bShift; ~3WL)%  
  CString m_Path; N~=A  
  CString m_Number; [A~G-  
  //}}AFX_DATA icUT<@0  
  // ClassWizard generated virtual function overrides *QE<zt  
  //{{AFX_VIRTUAL(CCaptureDlg) Z& !!]"I  
 public: ]!YtH]}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); sCH)gr@gJ^  
 protected: v.Ogf 5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Zu<]bv  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); s[3fqdLP&  
  //}}AFX_VIRTUAL !UV5zmS  
  // Implementation #P2;K dDO  
 protected: wpPn}[a  
  HICON m_hIcon; `T!#@&+  
  // Generated message map functions sLcY,AH  
  //{{AFX_MSG(CCaptureDlg) Y'"N"$n'_  
  virtual BOOL OnInitDialog(); +1{fzb>9_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ;Fl<v@9  
  afx_msg void OnPaint(); ,ul5,ygA  
  afx_msg HCURSOR OnQueryDragIcon();  5K56!*Y  
  virtual void OnCancel(); HV]Ze>}  
  afx_msg void OnAbout(); O ++/ry%k  
  afx_msg void OnBrowse(); +p:Y=>bTj  
  afx_msg void OnChange(); eE:&qy^  
 //}}AFX_MSG LhJa)jFQ  
 DECLARE_MESSAGE_MAP() 1]4^V7y  
}; u@ N~1@RT|  
#endif k1N$+h ;\  
: iY$82wQ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file b^V'BC3  
#include "stdafx.h" PjqeE,5  
#include "Capture.h" @ Gjny BJ  
#include "CaptureDlg.h" X, fu!  
#include <windowsx.h> A[/I#Im7  
#pragma comment(lib,"hook.lib") ):6 -  
#ifdef _DEBUG {E,SHh   
#define new DEBUG_NEW Iz\1~  
#undef THIS_FILE cwtD@KC[B  
static char THIS_FILE[] = __FILE__; g@nk.aRw  
#endif 3 (lVmfk  
#define IDM_SHELL WM_USER+1 W"(u^}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 66ohmP@04Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^7XAw: ?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }Zl"9A#K  
class CAboutDlg : public CDialog ;[5r7 jHU  
{ oNRG25  
 public: NCt~9xS.  
  CAboutDlg(); Up?=m^  
  // Dialog Data z:G}>fk5  
  //{{AFX_DATA(CAboutDlg) sk X]8  
  enum { IDD = IDD_ABOUTBOX }; BnEdv8\,&s  
  //}}AFX_DATA rFd@mO  
  // ClassWizard generated virtual function overrides 6}&^=^-  
  //{{AFX_VIRTUAL(CAboutDlg) f~\Xg7<  
 protected: 6M><(1fT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $-G`&oT  
  //}}AFX_VIRTUAL zNtq"T[  
  // Implementation Lx+`<<_dJ  
 protected: 12gw#J/)9h  
  //{{AFX_MSG(CAboutDlg) fD6GQ*  
  //}}AFX_MSG .LE+/n  
  DECLARE_MESSAGE_MAP() c4]u&tvjJ  
}; pieT'mA  
E <@\>y.[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .hz2&9Ow  
{ ! Cb=B  
 //{{AFX_DATA_INIT(CAboutDlg) }:#dV B+  
 //}}AFX_DATA_INIT 0\ f-z6  
} ~iTxv_\=6u  
6Y?`=kAp  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9O >z4o  
{ i>GdRG&q  
 CDialog::DoDataExchange(pDX); T\3[F%?  
 //{{AFX_DATA_MAP(CAboutDlg) sc xLB;  
 //}}AFX_DATA_MAP ?y_awoBd1  
} 8R/ *6S=&  
w~-X>~}  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rWr/p^~  
 //{{AFX_MSG_MAP(CAboutDlg) yh!B!v'  
 // No message handlers ks:{TA27  
 //}}AFX_MSG_MAP d.\PS9l  
END_MESSAGE_MAP() _t.FL@3e  
fOBN=y6x  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T|+$@o  
: CDialog(CCaptureDlg::IDD, pParent) 5faj;I{%JY  
{ ZLJNw0!=|t  
 //{{AFX_DATA_INIT(CCaptureDlg) qY}Cg0[@g  
  m_bControl = FALSE; W78o*z[O  
  m_bAlt = FALSE; wgZrrq/W|  
  m_bShift = FALSE; 3j&B(aLy  
  m_Path = _T("c:\\"); 'G Y/Q5  
  m_Number = _T("0 picture captured."); Yw^ Gti'<  
  nCount=0; 3]S`|#J  
  bRegistered=FALSE; l\aUresm  
  bTray=FALSE; dpn3 (  
 //}}AFX_DATA_INIT .eTk=i[N-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 DB8s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *<dHqK`?C  
} u+DX$#-n!]  
j |td,82.  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5B|,S1b  
{ 2FT-}w0;  
 CDialog::DoDataExchange(pDX); ZY Kd  
 //{{AFX_DATA_MAP(CCaptureDlg) G+C} <S}  
  DDX_Control(pDX, IDC_KEY, m_Key); |Mlh;  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Oxj(g;}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >)sqh ~P  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); |8'B/ p=  
  DDX_Text(pDX, IDC_PATH, m_Path); s!`H  
  DDX_Text(pDX, IDC_NUMBER, m_Number); T9y768%  
 //}}AFX_DATA_MAP uN(b.5y  
} L]>4Nd  
d#7]hF  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) w`Xg%*]}  
//{{AFX_MSG_MAP(CCaptureDlg) ^BNp`x;;`  
 ON_WM_SYSCOMMAND() AA.Ys89V  
 ON_WM_PAINT() x\]z j!  
 ON_WM_QUERYDRAGICON() SJ[AiHR  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) j!CU  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) TU-c9"7M~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) MA"#rOcP  
//}}AFX_MSG_MAP eaxfn]gV  
END_MESSAGE_MAP() 2:~cJk{  
/=ACdJ  
BOOL CCaptureDlg::OnInitDialog() $owb3g(%4  
{ ex0oAt^  
 CDialog::OnInitDialog(); & qL<C  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #'iPDRYy  
 ASSERT(IDM_ABOUTBOX < 0xF000); PC0HH  
 CMenu* pSysMenu = GetSystemMenu(FALSE); O(Td:Zdp  
 if (pSysMenu != NULL) '2xcce#  
 { wzbz }P>  
  CString strAboutMenu; _f66>a<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); c _p[yS  
  if (!strAboutMenu.IsEmpty()) o oDdV >  
  { A`Q >h{  
   pSysMenu->AppendMenu(MF_SEPARATOR); }bCK  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;YM]K R;  
  } ex=)H%_|  
 } QA!#s\  
 SetIcon(m_hIcon, TRUE); // Set big icon zM\IKo_"  
 SetIcon(m_hIcon, FALSE); // Set small icon )1K! [ W}t  
 m_Key.SetCurSel(0); mCK],TOA:  
 RegisterHotkey(); Mb~~A5  
 CMenu* pMenu=GetSystemMenu(FALSE); D2V v\f  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); pd7O`.3  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); t#{x?cF  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); e@yx}:]h  
 return TRUE; // return TRUE unless you set the focus to a control ]*a@*0=  
} _ flg Q  
i<Q& D\Pv  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) OMi02tSm  
{ p&QmIX]BZ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) W0U`Kt&~a  
 { /t$*W\PL@  
  CAboutDlg dlgAbout; niQ+EAD  
  dlgAbout.DoModal(); hi0XVC95  
 } B#Qpd7E+*  
 else r:.6"VQu}  
 { U(P:Je  
  CDialog::OnSysCommand(nID, lParam); Z$1.^H.Db  
 }  I}rGx  
} h&q=I.3O|?  
7^&lbzVbm(  
void CCaptureDlg::OnPaint() R~!\ -6%_  
{ / Z1Wy-Z  
 if (IsIconic()) 7x%S](m%  
 { ,}n=Z  
  CPaintDC dc(this); // device context for painting {clC n  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \+G.]|"Y  
  // Center icon in client rectangle 7 T mK  
  int cxIcon = GetSystemMetrics(SM_CXICON); 8V,"Id][  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7t`E@dm  
  CRect rect; :|zp8|  
  GetClientRect(&rect); ~K_]N/ >  
  int x = (rect.Width() - cxIcon + 1) / 2; {[my"n 2  
  int y = (rect.Height() - cyIcon + 1) / 2; CH55K[{<  
  // Draw the icon Imke/ =h  
  dc.DrawIcon(x, y, m_hIcon); pmoGudaRF  
 } :&qC<UD  
 else gO9'q='5l  
 { u/;_?zI  
  CDialog::OnPaint(); cl@kRX<7'  
 } `!<x"xKu  
} 2.!1kije  
F9v)R #u~  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~d&'Lp[3  
{ u"*J[M~  
 return (HCURSOR) m_hIcon; ^M [#^wv,  
} =A$Lgk>|  
?rAi=w&c  
void CCaptureDlg::OnCancel() !~?W \b\:  
{ v^<<[I2 C  
 if(bTray) i0VhG :O;  
  DeleteIcon(); #dHr&1(  
  CDialog::OnCancel(); 'lxLnX  
} /L)?> tg  
qwL 0~I  
void CCaptureDlg::OnAbout() Nz3zsP$  
{ p .lu4  
 CAboutDlg dlg; *iPs4Es-  
 dlg.DoModal(); PG\\V$}A(  
} 'uws  
!}z%#$  
void CCaptureDlg::OnBrowse() )lQN)! .)  
{ 0T7M_G'5Q  
 CString str; ~o}moE/ ;O  
 BROWSEINFO bi; 37J\i ]  
 char name[MAX_PATH]; 0Ddn@!J*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); u4go*#  
 bi.hwndOwner=GetSafeHwnd(); }~myf\$  
 bi.pszDisplayName=name; <ur KIu  
 bi.lpszTitle="Select folder"; T_3V/)%@  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; }P05eI  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Fsnw3/Nr  
 if(idl==NULL) 3s3a>  
  return; 58M'r{8_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); I[tAT[ <  
 str.ReleaseBuffer(); >&*6Fqd  
 m_Path=str; kqjxJ5  
 if(str.GetAt(str.GetLength()-1)!='\\') +I^+k"  
  m_Path+="\\"; c ,Qw;  
 UpdateData(FALSE); tVC@6Z$  
} }K#iCby4  
Vww@eK%5Q  
void CCaptureDlg::SaveBmp() ;+S2h-4  
{ plzE  
 CDC dc; _JfJ%YXy  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); l*~"5f03  
 CBitmap bm; ~+sne7 6 U  
 int Width=GetSystemMetrics(SM_CXSCREEN); U;x99Go:  
 int Height=GetSystemMetrics(SM_CYSCREEN); OI)&vQ5k  
 bm.CreateCompatibleBitmap(&dc,Width,Height); *=($r%)  
 CDC tdc; p=:7 atE  
 tdc.CreateCompatibleDC(&dc); N{?Tm`""  
 CBitmap*pOld=tdc.SelectObject(&bm); Yt\E/*%  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); YR$tPe  
 tdc.SelectObject(pOld); .d<~a1k  
 BITMAP btm; P58\+9d_  
 bm.GetBitmap(&btm); jrDz7AfA  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; rU/-Wq`B  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4v rm&k  
 BITMAPINFOHEADER bih; #R~">g:w  
 bih.biBitCount=btm.bmBitsPixel; g_3rEvf"4  
 bih.biClrImportant=0; MAsWds`bpB  
 bih.biClrUsed=0; u.ULS3`C/X  
 bih.biCompression=0; f]@[4<Ny  
 bih.biHeight=btm.bmHeight; !Ei Ze.K  
 bih.biPlanes=1; k@'?"CP\Xq  
 bih.biSize=sizeof(BITMAPINFOHEADER); @\x,;!N@  
 bih.biSizeImage=size; &6|6J1c8  
 bih.biWidth=btm.bmWidth; \#h})`  
 bih.biXPelsPerMeter=0; `D&#U'wB   
 bih.biYPelsPerMeter=0; eY0Ly7  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5^G7pI7  
 static int filecount=0; (H|%?F;{l  
 CString name; VWnu#_(  
 name.Format("pict%04d.bmp",filecount++); 8eg2o$k_,#  
 name=m_Path+name; F9>(W#aC  
 BITMAPFILEHEADER bfh; lW{I`r\]  
 bfh.bfReserved1=bfh.bfReserved2=0; )W_ Y3M,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ,*9#c*'S  
 bfh.bfSize=54+size; =RCfibT!C  
 bfh.bfOffBits=54; Y{x[N}h  
 CFile bf; *~\;&G29Y  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @LwVmR |{  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %8bFQNd  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `Gy>tD.#V-  
  bf.WriteHuge(lpData,size); XnNOj>!  
  bf.Close(); Z_eqM4{  
  nCount++; cOj +}Hz58  
 } V^/h;/! ^  
 GlobalFreePtr(lpData); 0C4*F  
 if(nCount==1) \rw'QAi8r  
  m_Number.Format("%d picture captured.",nCount); cG~_EX$  
 else T1g:gfw@  
  m_Number.Format("%d pictures captured.",nCount); s5_1}KKCs  
  UpdateData(FALSE); ^^j|0qshL  
} J8`1V `$  
tA;ZW2$#  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) OI;L9\MJc  
{ g%<{G/Tz  
 if(pMsg -> message == WM_KEYDOWN) <uWJ>sg^ 6  
 { ~@a) E+LsF  
  if(pMsg -> wParam == VK_ESCAPE) W2X+N acD  
   return TRUE; }[hDg6i  
  if(pMsg -> wParam == VK_RETURN) DbPBgD>Q  
   return TRUE; AR[M8RA  
 } YV2pERl  
 return CDialog::PreTranslateMessage(pMsg); A61-AwvF8-  
} *`\4j*$^  
0*]<RM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <9MQ  
{ y7}~T!UyfF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2_ZHJ,r   
  SaveBmp(); f6/\JVi)-  
  return FALSE; N8/Au=De_  
} Ed ?Yk* 4  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |?pYJkrYO  
 CMenu pop; <7RkM  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); BhhK| U/  
 CMenu*pMenu=pop.GetSubMenu(0); E`sapk  
 pMenu->SetDefaultItem(ID_EXITICON); e2VL/>y`  
 CPoint pt; Fr E/K_L  
 GetCursorPos(&pt); 5u=U--  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1nX68fS.9  
 if(id==ID_EXITICON) S quqaX+<  
  DeleteIcon(); Z)Xq!]~/g  
 else if(id==ID_EXIT) pqNoL* H  
  OnCancel(); Di5Op(S((  
 return FALSE; B=nx8s  
} % 'L=  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); KlSY^(kHR  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) swe8  
 AddIcon(); 'DB({s  
 return res;  ZeDDH  
} H]]>sE  
`(w kqa  
void CCaptureDlg::AddIcon() %CfTqbB  
{ _tg3%X]  
 NOTIFYICONDATA data; vr]dRStr  
 data.cbSize=sizeof(NOTIFYICONDATA); mSvTnd8  
 CString tip; nG(|7x   
 tip.LoadString(IDS_ICONTIP); Xb07 l3UG  
 data.hIcon=GetIcon(0); s$=B~l  
 data.hWnd=GetSafeHwnd(); fjeE.  
 strcpy(data.szTip,tip); E rRMiT  
 data.uCallbackMessage=IDM_SHELL; a} Iz  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; D-;43>yi<  
 data.uID=98; ='l6&3X  
 Shell_NotifyIcon(NIM_ADD,&data); E`Zh\u)  
 ShowWindow(SW_HIDE); 5E!|on  
 bTray=TRUE; a6K$omu  
} 4QN6BZJ5  
v |hKf6  
void CCaptureDlg::DeleteIcon() Bg 8t'dw?K  
{ O'?lW~CD.>  
 NOTIFYICONDATA data; M3xi 0/.  
 data.cbSize=sizeof(NOTIFYICONDATA); )-6[ Bw  
 data.hWnd=GetSafeHwnd(); wE=8jl*  
 data.uID=98; NIcNL(]  
 Shell_NotifyIcon(NIM_DELETE,&data); 3ks|  
 ShowWindow(SW_SHOW); hc~#l#  
 SetForegroundWindow(); +\]S<T*;  
 ShowWindow(SW_SHOWNORMAL); )7BNzj"~  
 bTray=FALSE; i\c^h;wX  
} ]`+"o[  
?2 O-EiWjZ  
void CCaptureDlg::OnChange() J5r L7  
{ #onfac-3  
 RegisterHotkey(); X wn|.  
} N6 Cc%,  
m]b.P,~v  
BOOL CCaptureDlg::RegisterHotkey() jl|X$w  
{ # v/aI*Rl  
 UpdateData(); Pp")hFx  
 UCHAR mask=0; Szob_IEq,  
 UCHAR key=0; RI].LB_  
 if(m_bControl) Tr+Y@]"  
  mask|=4; os0"haOI9h  
 if(m_bAlt) 'G By^hj?  
  mask|=2; k1  txY  
 if(m_bShift) i2Iu 2  
  mask|=1; sZ(Q4)r  
  key=Key_Table[m_Key.GetCurSel()]; ?_`P;}4#  
 if(bRegistered){ n ;fTx  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); .M#>@~XR  
  bRegistered=FALSE; &qj&WfrB,  
 } - &LZle&M  
 cMask=mask; I5 7<0  
 cKey=key; K%~Kg9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); {s^n|b}  
 return bRegistered; So0,)  
} W!Os ci  
kO O~%|1CP  
  四、小结 O#ajoE  
0DjBqh$  
  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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