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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: CV3DMA  
  s!de2z  
  一、实现方法 (bvoF5%  
nB&j   
  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: R04J3D|  
>0T Za  
#pragma data_seg("shareddata") SX_4=^  
HHOOK hHook =NULL; //钩子句柄 H(&Z:{L  
UINT nHookCount =0; //挂接的程序数目 t!t=|JNf{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 6v>z h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 \iga Q\~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey oCuV9dA.  
static int KeyCount =0; Hm4bN\%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2yxi= XWZ  
#pragma data_seg() e "n|jRh  
v ): V  
  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。 RHI&j~  
3\+N`!  
  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: l;0y-m1  
_Ex|f5+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR J*K<FFp3<  
cKey,UCHAR cMask) wDw<KU1UK  
{ IT&i,`cJ~F  
 BOOL bAdded=FALSE; no|Gq>Xp  
 for(int index=0;index<MAX_KEY;index++){ TY6 rwU  
  if(hCallWnd[index]==0){ +N R n0 z(  
   hCallWnd[index]=hWnd; *<q4S(l  
   HotKey[index]=cKey; ~!] m6/  
   HotKeyMask[index]=cMask; Y`^o7'Z2^P  
   bAdded=TRUE; l#xw.2bo  
   KeyCount++; Xm@aYNV  
   break; }N]!0Ka  
  } g_M ^E-3  
 } SH=:p^J  
 return bAdded; =~J fVozU  
} JO}?.4B  
//删除热键 ,]q%/yxi  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) RUX8qT(Z  
{ t3>$|}O]t  
 BOOL bRemoved=FALSE; =:/>6 H1x  
 for(int index=0;index<MAX_KEY;index++){ _l T0H u  
  if(hCallWnd[index]==hWnd){ 7P*Z0%Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ mPG7Zy$z  
    hCallWnd[index]=NULL; lD3)TAW@o  
    HotKey[index]=0; 7Ud'd<  
    HotKeyMask[index]=0; fnOIv#  
    bRemoved=TRUE; j)";:v  
    KeyCount--; @|=UrKAN  
    break; QptOQ3!  
   } [pR)@$"k'  
  } ]3+``vL  
 } 5Eal1Qu  
 return bRemoved; }p*?1N  
} <4f,G]UH_  
*B{-uc3o  
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  DLL中的钩子函数如下: TPK@*9rI  
SUu >6'LN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >a@>N  
{ +?V0:Kz]  
 BOOL bProcessed=FALSE; [+gzdLad  
 if(HC_ACTION==nCode) l&|)O6N  
 { &k+*3.X  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ev"M;"y  
   switch(wParam) r=$gT@  
   {  WIG=D{\Yx  
    case VK_MENU: Tq#<Po $  
     MaskBits&=~ALTBIT; =G>.-Qfs  
     break; q^]tyU!w  
    case VK_CONTROL: Q!]IG;3Sx|  
     MaskBits&=~CTRLBIT;  (YrR8  
     break; ^IgS  
    case VK_SHIFT: [Xh\m DU.  
     MaskBits&=~SHIFTBIT; pYh!]0n  
     break; $T/#1w P  
    default: //judge the key and send message = t-fYV  
     break; PCZ]R  
   } +6376$dC  
   for(int index=0;index<MAX_KEY;index++){ @/(@/*+"  
    if(hCallWnd[index]==NULL) LzE/g)>  
     continue; $iHoOYx]<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZqP7@fO_%  
    { #TATqzA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =qX*]  
     bProcessed=TRUE; $',3Pv  
    } ^ $wJi9D6  
   } ,R}Z=w#  
  } $}4K`Iu  
  else if((lParam&0xc000ffff)==1){ //有键按下 2&x7W*  
   switch(wParam) oZ-FF'  
   { GA ik;R  
    case VK_MENU: 8f-:d]  
     MaskBits|=ALTBIT; ;dOs0/UM&  
     break; Mciq-c)  
    case VK_CONTROL: Y }/c N\  
     MaskBits|=CTRLBIT; gVA; `<  
     break; =)*JbwQ   
    case VK_SHIFT: SB1[jcJ  
     MaskBits|=SHIFTBIT; ]>vf9]  
     break; 6ZOAmH fs  
    default: //judge the key and send message T<M?PlED  
     break; 9gR.RwR X  
   } !o<ICHHH  
   for(int index=0;index<MAX_KEY;index++){ u}m.}Mws  
    if(hCallWnd[index]==NULL) :MBS>owR  
     continue; >b43%^yii  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n$ dw<y  
    { 7V 'Le2T'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6V P)$h8  
     bProcessed=TRUE; ZOn_dYjC  
    } J | q^+K  
   } B kV(81"C  
  } jN{Zw*  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 0d`5Gy_D%  
   for(int index=0;index<MAX_KEY;index++){ M8zE3;5  
    if(hCallWnd[index]==NULL) gD1+]am  
     continue; cUsL 6y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8T7f[?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G h=<0WaF=  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?} X}#  
   } kXEtuO5FUM  
  } Of#K:`1@  
 } HT&p{7kFm  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $l#{_~ "m7  
} '%ebcL  
Efvq?cG&  
  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: ~?-qZ<9/  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )2]a8JVf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RF!'K ko  
ZYDW v/u  
  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: ]<+3Vw  
e2bLkb3c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %Zu Ll(  
{ (Xj.iP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) >|(%2Zl  
 { pX^=be_  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 f)U6p  
  SaveBmp(); 5}7ISNP;f  
  return FALSE; c"qPTjY  
 } lvx]jd\  
 …… //其它处理及默认处理 c>rKgx  
} \kyM}5G(<0  
Vpw[B.v  
5Edo%Hd6  
  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。 -)6;0  
"8?TSm8  
  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。 q- H&5K  
Y-= /,   
  二、编程步骤 -~} tq]  
D>Ua#<52q  
  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"; |mvM@V;^8{  
UFIjW[h  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :~i+tD  
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  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; LGfmUb-{]  
jJ c07r']  
  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; F:,#?  
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  5、 添加代码,编译运行程序。 KDBY9`08  
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三、程序代码 c(CJ{>F%  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL ZBC@xM&-  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 6: GN(R$0  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /vy?L\`)#  
#if _MSC_VER > 1000 Mn{XVXY@qm  
#pragma once R~cIT:i  
#endif // _MSC_VER > 1000 p&uCp7]U  
#ifndef __AFXWIN_H__ a-:pJE.'p  
#error include 'stdafx.h' before including this file for PCH 716hpj#*  
#endif OiF]_"  
#include "resource.h" // main symbols RJLFj  
class CHookApp : public CWinApp  +xq=<jy  
{ ^F&A6{9f/h  
 public: 3@'lIV ?,q  
  CHookApp(); ^1Yo-T(R  
  // Overrides 8lpzSJP4k  
  // ClassWizard generated virtual function overrides  qJURPK  
  //{{AFX_VIRTUAL(CHookApp) v?}pi  
 public: }|,EU!nDi  
  virtual BOOL InitInstance(); 6$DG.p  
  virtual int ExitInstance(); xh`Du|jvm  
  //}}AFX_VIRTUAL _\!0t  
  //{{AFX_MSG(CHookApp) '(XW$D  
  // NOTE - the ClassWizard will add and remove member functions here. 4Lw'v:(  
  // DO NOT EDIT what you see in these blocks of generated code ! x.o3iN[=  
  //}}AFX_MSG C6CGj8G  
  DECLARE_MESSAGE_MAP() w~n kNqm  
}; BPqwDj W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); YY\Rua/nG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I0(8Z]x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a 1NCVZ  
BOOL InitHotkey(); C?S~L5a#oC  
BOOL UnInit(); u,\xok"  
#endif (c<f<D|  
xp(mB7;:  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. pb6 Q?QG,  
#include "stdafx.h" Z+Xc1W^  
#include "hook.h" OK.-]()!  
#include <windowsx.h> 1-/4Y5?}  
#ifdef _DEBUG T6;>O`B.r  
#define new DEBUG_NEW P$Ax c/H  
#undef THIS_FILE FJW`$5?  
static char THIS_FILE[] = __FILE__; \k4M{h6  
#endif ?f9$OLEB  
#define MAX_KEY 100 &`m~o/  
#define CTRLBIT 0x04 %Dl_}  
#define ALTBIT 0x02 ti+pUlVrM  
#define SHIFTBIT 0x01 -;f+; M  
#pragma data_seg("shareddata") uO6c3|Zjs  
HHOOK hHook =NULL; pL%4= ]m  
UINT nHookCount =0; }0vtc[!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey wqf&i^_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT tG_-;03<`4  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey WVinP(#nfM  
static int KeyCount =0; B JU*`Tx  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 9Y\F53p&j  
#pragma data_seg() aam1tm#Q  
HINSTANCE hins; -}N Ab^d  
void VerifyWindow(); [O [FCn  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Z5yt]-WN&  
//{{AFX_MSG_MAP(CHookApp) 'H|;%J6d>  
// NOTE - the ClassWizard will add and remove mapping macros here. *TJ<  
// DO NOT EDIT what you see in these blocks of generated code! q;IhLBl'  
//}}AFX_MSG_MAP |HNQ|r_5S  
END_MESSAGE_MAP() p FXd4*  
~T;K-9R  
CHookApp::CHookApp() X4XFu  
{ j\nE8WH  
 // TODO: add construction code here, WT I'O  
 // Place all significant initialization in InitInstance UP5%C;  
} .0?ss0~  
xu`d`!Tx  
CHookApp theApp; Vvx a.B  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 'T6B_9GQ8  
{ t CkoYrvT  
 BOOL bProcessed=FALSE; kqQphKkL  
 if(HC_ACTION==nCode) B #;s(O  
 { -`,~9y;tx  
  if((lParam&0xc0000000)==0xc0000000){// Key up C:WtCAm(  
   switch(wParam) >aX:gN  
   { 3KDu!w@  
    case VK_MENU: vR<fdV  
     MaskBits&=~ALTBIT; M^Q&A R'F  
     break; ,HQ1C8  
    case VK_CONTROL: ^u=PdBY  
     MaskBits&=~CTRLBIT; 2LtU;}7s  
     break; ^ yY{o/6  
    case VK_SHIFT: S83]O!w0  
     MaskBits&=~SHIFTBIT; *;>V2!N=U  
     break; yY-FL`-  
    default: //judge the key and send message []^PJ  
     break; fma tc#G  
   } Ym3 "  
   for(int index=0;index<MAX_KEY;index++){ _-g-'Hr+N  
    if(hCallWnd[index]==NULL) D >psh- ,1  
     continue; F+lm[4n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ViCg|1c  
    { -lnTYxo+]^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A/ox#(!v  
     bProcessed=TRUE; )6PJ*;p-  
    } ,?P8m"  
   }  `;zu1o  
  } eTLI/?|+N  
  else if((lParam&0xc000ffff)==1){ //Key down i528e{&  
   switch(wParam) bjU 2UcI"<  
   { !&1}w86  
    case VK_MENU: a15,'v$O  
     MaskBits|=ALTBIT; 5d)'`hACe  
     break; ;5,`Jpca  
    case VK_CONTROL: >OF:"_fh  
     MaskBits|=CTRLBIT; PR48~K,?  
     break; CnM+HN30o  
    case VK_SHIFT: n0Qh9*h  
     MaskBits|=SHIFTBIT; # |[`1  
     break; U[K0{PbY  
    default: //judge the key and send message 'iMHAP;N  
     break; p,M3#^ q  
   } 6,CU)-98G  
   for(int index=0;index<MAX_KEY;index++) qk"oFP6  
   { >cvE_g"?C  
    if(hCallWnd[index]==NULL) f\U?:8 3  
     continue; I,?Fqg'sq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9n06n$F  
    { P wt ?9I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <k!mdj)  
     bProcessed=TRUE; 8=ukS_?Vy  
    } k)<~nc-  
   } b/a?\0^  
  } 6E)uu; 8  
  if(!bProcessed){ hY4)W  
   for(int index=0;index<MAX_KEY;index++){ ]6?c8/M  
    if(hCallWnd[index]==NULL) [R@q]S/  
     continue; x= vE&9_u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,qBnqi[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); j SUAU}u!M  
   } N3S,33 8s  
  }  tH<9  
 } ovo?lE-a0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H4,.H,PZ  
} A?6{  
/ h 2*$  
BOOL InitHotkey() 2@=cqD7x  
{ <;TP@-a  
 if(hHook!=NULL){ ;XKo44%  
  nHookCount++; pqGf@24c<  
  return TRUE; c_D,MW\IC  
 } oHc-0$eMKY  
 else ,=q7}5o Y  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 5 b#" G"  
  if(hHook!=NULL) mcP{-oJ0W  
   nHookCount++; : . FfE  
  return (hHook!=NULL); #J<`p  
} |}]JWsuB  
BOOL UnInit() g0; &/;"  
{ `E4!u=%  
 if(nHookCount>1){ eEg1-  
  nHookCount--; \( Gf+  
  return TRUE; ],fwZd[t  
 } ~#N.!e4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); >%jEo'0;_  
 if(unhooked==TRUE){ 3; -@<9  
  nHookCount=0; Jnu}{^~  
  hHook=NULL; rSc,\upz  
 } a?xq*|?  
 return unhooked; bH)8UQR%  
} 5{!a+  
/pSUn"3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /v|68x6  
{ ba:mO$  
 BOOL bAdded=FALSE; H( DVVHx  
 for(int index=0;index<MAX_KEY;index++){ hK9t}NE.O  
  if(hCallWnd[index]==0){ c9cphZ(z  
   hCallWnd[index]=hWnd; {C,1w  
   HotKey[index]=cKey; yv#c =v|  
   HotKeyMask[index]=cMask; J _[e9  
   bAdded=TRUE; R"\u b"]  
   KeyCount++; twJ|Jmd  
   break; >X\s[d&(  
  } # ZYid t  
 } dg'CHxU  
 return bAdded; %gne%9nn  
} E=tx.h4xG~  
\ 3js}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \4`saM /x  
{ 7}iewtdy,  
 BOOL bRemoved=FALSE; ixI5Xd<  
 for(int index=0;index<MAX_KEY;index++){ _sf0{/< )  
  if(hCallWnd[index]==hWnd){ /Mi-lh^j-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >w]k3MC  
    hCallWnd[index]=NULL; sgb+@&}9n  
    HotKey[index]=0; I W] 841  
    HotKeyMask[index]=0; ~gLEhtW  
    bRemoved=TRUE; w'zO(6 `  
    KeyCount--; Fh!!T%5>C  
    break; \aJ-q?=  
   } bTy' 5"  
  } 3Mh,NQB  
 } /PB3^d>Q2  
 return bRemoved; 61Iy{-/ZV  
} gQ@Pw4bA  
65`'Upu  
void VerifyWindow() .KwuhmR  
{ a@a1TpLQ  
 for(int i=0;i<MAX_KEY;i++){ %\z COfN  
  if(hCallWnd!=NULL){ l_q>(FoqA  
   if(!IsWindow(hCallWnd)){ [:hy  
    hCallWnd=NULL; L_zmU_zD  
    HotKey=0; coP$7Q .  
    HotKeyMask=0; j5VRv$P  
    KeyCount--; lWyP[>*  
   } ^6NABXL  
  } SUnmp  
 } r1az=$  
} >. nt'BQ  
"<n"A7e  
BOOL CHookApp::InitInstance() /x8C70W^  
{ :]z-Rz  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zHum&V8=H  
 hins=AfxGetInstanceHandle(); {;(g[H=q;  
 InitHotkey(); m 'H  
 return CWinApp::InitInstance(); z1@sEfk>  
} JjTzq2'%  
DRg ~HT  
int CHookApp::ExitInstance() Tdmo'"m8z_  
{ ,%b1 ]zZQ  
 VerifyWindow(); (.nJT"&  
 UnInit(); 3TvhOC>yG  
 return CWinApp::ExitInstance(); Fi3(glgd-  
} ht74h  
d&R\7)0  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7J!d3j2TR  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *,XJN_DKj  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =iN_Ug+  
#if _MSC_VER > 1000 vJj j+:  
#pragma once [\%t<aa  
#endif // _MSC_VER > 1000 #O974f8  
<~8f0+"  
class CCaptureDlg : public CDialog PG~m-W+  
{ {arjW3~M:  
 // Construction zvs 2j"lb  
 public: wb Tg  
  BOOL bTray; @LMV?  
  BOOL bRegistered; ]O(HZD%  
  BOOL RegisterHotkey(); 96V, [-arf  
  UCHAR cKey; _2n/vF;I+_  
  UCHAR cMask; Kmf-l*7}  
  void DeleteIcon(); WxP4{T* <  
  void AddIcon(); "BNmpP  
  UINT nCount; >_% g8T'  
  void SaveBmp();   SrU   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor *CD=cmdD*  
  // Dialog Data h|>n3-k|p  
  //{{AFX_DATA(CCaptureDlg) 0c;"bA0>Sx  
  enum { IDD = IDD_CAPTURE_DIALOG }; o!dkS/u-m  
  CComboBox m_Key; = Ow&UI  
  BOOL m_bControl; DmpJzH j|  
  BOOL m_bAlt; ] 8cX#N,M  
  BOOL m_bShift; g$+O<a@n  
  CString m_Path; c94PWPU  
  CString m_Number; cFNtY~(b  
  //}}AFX_DATA 3&d+U)E  
  // ClassWizard generated virtual function overrides F^v{Jqc  
  //{{AFX_VIRTUAL(CCaptureDlg) eOmxA<h  
 public: ;8x^9Q  
  virtual BOOL PreTranslateMessage(MSG* pMsg); #7:9XID /  
 protected:  D)eKq!_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?lna8]t  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2{tJ'3  
  //}}AFX_VIRTUAL ~#x!N=q  
  // Implementation dz.MH  
 protected: 9- <V%eNX  
  HICON m_hIcon; [0 f6uIF  
  // Generated message map functions (Jr;:[4XC  
  //{{AFX_MSG(CCaptureDlg) bL#TR;*]  
  virtual BOOL OnInitDialog(); Oes+na'^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); N P(?[W  
  afx_msg void OnPaint(); }z 2-|"H  
  afx_msg HCURSOR OnQueryDragIcon(); :[?o7%"  
  virtual void OnCancel(); 'GO..m"G  
  afx_msg void OnAbout(); ,O`*AzjS5Q  
  afx_msg void OnBrowse(); T`DlOi]Z_  
  afx_msg void OnChange(); rca"q[,  
 //}}AFX_MSG !Y i<h/:  
 DECLARE_MESSAGE_MAP() ",@g  
}; Xg#([}b  
#endif ]6 7wk  
|,~A9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file L}pFb@  
#include "stdafx.h" 'WgwLE_  
#include "Capture.h"  o|im  
#include "CaptureDlg.h" *iN]#)3>  
#include <windowsx.h> t/BiZo|zl  
#pragma comment(lib,"hook.lib") I:7,CV  
#ifdef _DEBUG  -~aEqj#?  
#define new DEBUG_NEW juZ3""  
#undef THIS_FILE ~PvzUT-^  
static char THIS_FILE[] = __FILE__; `d;izQ1_=  
#endif .B n2;nO  
#define IDM_SHELL WM_USER+1 EqU[mqeF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $1 \!Oe[i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .F|WQ7Mu  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8LKZ3Y|  
class CAboutDlg : public CDialog lL f01sa4  
{ ]/naH#8G  
 public: C&"2`ll  
  CAboutDlg(); 7Zn Q] ?  
  // Dialog Data t$5]1dY$X  
  //{{AFX_DATA(CAboutDlg) U,(+rMeY0  
  enum { IDD = IDD_ABOUTBOX }; Z'kYf   
  //}}AFX_DATA bW3o%srxa  
  // ClassWizard generated virtual function overrides wZb@VG}%  
  //{{AFX_VIRTUAL(CAboutDlg) ~ZC=!|Q#  
 protected: N4NH)x  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support k&;L(D  
  //}}AFX_VIRTUAL xf SvvCy  
  // Implementation } ~bOP^'  
 protected: ar}759  
  //{{AFX_MSG(CAboutDlg) -"L6^IH7  
  //}}AFX_MSG >k-poBw  
  DECLARE_MESSAGE_MAP() :Djp\ e6!  
}; A| -\C$  
m 1;jS|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) kniMXeiu  
{ }7v2GfEkM  
 //{{AFX_DATA_INIT(CAboutDlg) Q{-r4n|b  
 //}}AFX_DATA_INIT a5&j=3)|  
} g >oLc6T  
)g F9D1eA  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %QbrVl+  
{ [uHI 6Q#  
 CDialog::DoDataExchange(pDX); /LzNr0>2  
 //{{AFX_DATA_MAP(CAboutDlg) b)@x@3"O  
 //}}AFX_DATA_MAP \2b9A' d>  
} %>z}P&Yz  
)Me&xQTn  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6w ,xb&S  
 //{{AFX_MSG_MAP(CAboutDlg) B9-=.2.WU  
 // No message handlers s[bKGn@  
 //}}AFX_MSG_MAP  S_6;e|  
END_MESSAGE_MAP() 5+Ut]AL5  
\ed(<e>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) NQD b;5:  
: CDialog(CCaptureDlg::IDD, pParent) `9gx-')]\  
{ jm"xf7  
 //{{AFX_DATA_INIT(CCaptureDlg) _v,n~a}&  
  m_bControl = FALSE; g5[3[Z(.  
  m_bAlt = FALSE; vt,X:3  
  m_bShift = FALSE; iiscm\  
  m_Path = _T("c:\\"); DdgFBO  
  m_Number = _T("0 picture captured."); S3f BZIPp  
  nCount=0; /#5ZP\e  
  bRegistered=FALSE; WI3!?>d  
  bTray=FALSE; )]R8 $S  
 //}}AFX_DATA_INIT Y8(yOVy9  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 q<7n5kJ~  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2{N0.  |5  
} 0qd`Pf   
|<$O5b'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) kA0 ^~  
{ Lf9h;z>#  
 CDialog::DoDataExchange(pDX); +\Q@7Lj  
 //{{AFX_DATA_MAP(CCaptureDlg) f*Bc`+G  
  DDX_Control(pDX, IDC_KEY, m_Key); Ek0.r)Nw  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {n'}S(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); bE"CSK#  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); )M~5F,)  
  DDX_Text(pDX, IDC_PATH, m_Path); ?`$4ZDM  
  DDX_Text(pDX, IDC_NUMBER, m_Number); |Gi/=[Tp  
 //}}AFX_DATA_MAP 7;{F"/A  
} ly@CX((W  
E*vi@aI  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) KhvCkQMI@  
//{{AFX_MSG_MAP(CCaptureDlg) x1h!_^(QfF  
 ON_WM_SYSCOMMAND() =JkSq J)?  
 ON_WM_PAINT() T /uu='3  
 ON_WM_QUERYDRAGICON() F(r &:3!97  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) C&gJP7UF  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) XJ+sm^`vOf  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9q?gmAn.  
//}}AFX_MSG_MAP RB2u1]l  
END_MESSAGE_MAP() e{=$4F  
T5)?6i -N  
BOOL CCaptureDlg::OnInitDialog() dWA7U6c<  
{ "cx" d:  
 CDialog::OnInitDialog(); m" Gr pE3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *h1@eJHMz  
 ASSERT(IDM_ABOUTBOX < 0xF000); *KAuyJr  
 CMenu* pSysMenu = GetSystemMenu(FALSE); rxA<\h,A  
 if (pSysMenu != NULL) P^UcpU,  
 { 7w|s8B  
  CString strAboutMenu; #<{MtK_  
  strAboutMenu.LoadString(IDS_ABOUTBOX); p[Es4S}N  
  if (!strAboutMenu.IsEmpty()) r|+Zni]  
  { IkkrnG8  
   pSysMenu->AppendMenu(MF_SEPARATOR); H b.oKo$T  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); bmLNR  
  } A|^?.uIM  
 } u CXd% CzE  
 SetIcon(m_hIcon, TRUE); // Set big icon :>=,sLfJ  
 SetIcon(m_hIcon, FALSE); // Set small icon  NNX/2  
 m_Key.SetCurSel(0); _>.%X45xi  
 RegisterHotkey(); cQjJ9o7  
 CMenu* pMenu=GetSystemMenu(FALSE); 23PSv8;EM  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {#MViBhd%  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); x UYSD  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0#G"{M  
 return TRUE; // return TRUE unless you set the focus to a control 5"+* c@L  
} X'Oo ogu  
2B# \683  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %o-*~GQ@B  
{ 8eNGPuoL)  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) h!.(7qdd  
 { {|cA[#j#  
  CAboutDlg dlgAbout; Tn|re Xc0e  
  dlgAbout.DoModal(); v|e>zm <  
 } !**q20-aP  
 else tB[K4GNSQ  
 { R)v`ZF,/b  
  CDialog::OnSysCommand(nID, lParam); 8cHZBM7'  
 } iZ UBw  
} Y:wds=lA  
1{*x+GC^/  
void CCaptureDlg::OnPaint() ?~$y3<[  
{ 2-]m#}zbP  
 if (IsIconic()) {)+/w"^.  
 { |67UN U  
  CPaintDC dc(this); // device context for painting *m7e>]-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ZISR]xay  
  // Center icon in client rectangle ;-3M  
  int cxIcon = GetSystemMetrics(SM_CXICON); W$y?~2  
  int cyIcon = GetSystemMetrics(SM_CYICON); "H({kmR  
  CRect rect; x-"7{@lz  
  GetClientRect(&rect); r=vE0;7  
  int x = (rect.Width() - cxIcon + 1) / 2; 2b<0g@~X  
  int y = (rect.Height() - cyIcon + 1) / 2; z}5XLa^  
  // Draw the icon \%K6T)9  
  dc.DrawIcon(x, y, m_hIcon); 9X-DR  
 } eK`tFs,u  
 else g$+3IVq&  
 { KP i@wl3  
  CDialog::OnPaint(); lm+wjhkN  
 } .p&M@h w  
} /w|YNDA]j  
=<<\Uo  
HCURSOR CCaptureDlg::OnQueryDragIcon() ?lTQjw{  
{ U|>Js!$  
 return (HCURSOR) m_hIcon; a P`;Nr=  
} !U91  
3cnsJV]  
void CCaptureDlg::OnCancel() Y{jhT^tKK  
{ N.fIg  
 if(bTray) uaS?y1:c  
  DeleteIcon(); V{8mx70  
  CDialog::OnCancel(); V/03m3!q  
} >uVG]  
F$caKWzny5  
void CCaptureDlg::OnAbout() _C##U;e!  
{ zUOYH4+  
 CAboutDlg dlg; f}fM%0/5  
 dlg.DoModal(); bv+PbK]iO  
} n9#@ e}r  
[P<oyd@#  
void CCaptureDlg::OnBrowse() 4"GY0) Q  
{ -1@kt<Es  
 CString str; =lzjMRX(?  
 BROWSEINFO bi; a^CIJ.P2  
 char name[MAX_PATH]; J[^-k!9M  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 0_ ;-QAd  
 bi.hwndOwner=GetSafeHwnd(); |{$Vk%cUE  
 bi.pszDisplayName=name; RW3&]l=  
 bi.lpszTitle="Select folder"; s}5;)>3~@  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; B${Q Y)t  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); RSp=If+4  
 if(idl==NULL) M;V2O;  
  return; m49)cK?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7{p,<Uz<"U  
 str.ReleaseBuffer(); ec{pWzAe  
 m_Path=str; 5y.kOe4vH  
 if(str.GetAt(str.GetLength()-1)!='\\') |kjk{  
  m_Path+="\\"; Tfj%Sb,zM  
 UpdateData(FALSE); 5YRa2#d  
} AH;h#dT  
NpSS/rd $  
void CCaptureDlg::SaveBmp() [z/OY&kF  
{ EayZ*e ]  
 CDC dc; .(! $j-B  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Ygg+*z  
 CBitmap bm; ?(E$|A  
 int Width=GetSystemMetrics(SM_CXSCREEN); /: B!hvpw  
 int Height=GetSystemMetrics(SM_CYSCREEN); >2%!=q3)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); R@;kY S  
 CDC tdc; %/4ChKf!VR  
 tdc.CreateCompatibleDC(&dc); SoCa_9*X  
 CBitmap*pOld=tdc.SelectObject(&bm); ;XANIT V  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Nl0*"}`I_  
 tdc.SelectObject(pOld); }e1f kjWk  
 BITMAP btm; h]I ^%7  
 bm.GetBitmap(&btm); $~_TE\F1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :X+7}!Wlo  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &)1+WrU  
 BITMAPINFOHEADER bih; KZ&{Ya  
 bih.biBitCount=btm.bmBitsPixel; SDZ/rC!C  
 bih.biClrImportant=0; j2V^1  
 bih.biClrUsed=0; WxFVbtw  
 bih.biCompression=0; PKmr5FB  
 bih.biHeight=btm.bmHeight; mkgDg y  
 bih.biPlanes=1; o H$4K8j  
 bih.biSize=sizeof(BITMAPINFOHEADER); Uh{|@D  
 bih.biSizeImage=size; "1Vuf<?C  
 bih.biWidth=btm.bmWidth; g%Eb{~v  
 bih.biXPelsPerMeter=0; 0ZTT^2R  
 bih.biYPelsPerMeter=0; $vx]\` ^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); L~>pSP^a  
 static int filecount=0; wgY: W:y'N  
 CString name; ttgb"Wb%S  
 name.Format("pict%04d.bmp",filecount++); ]e!9{\X,*  
 name=m_Path+name; Y'0H2B8  
 BITMAPFILEHEADER bfh; Ju# - >]  
 bfh.bfReserved1=bfh.bfReserved2=0; Ubv<3syR'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 54v}iG  
 bfh.bfSize=54+size; y$'(/iyz  
 bfh.bfOffBits=54; ApR>b%  
 CFile bf; p4[cPt~C  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Kx7s d i  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DYx3 NDX7  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); it \3-  
  bf.WriteHuge(lpData,size); oUoDj'JN{  
  bf.Close(); ve<D[jQsk  
  nCount++; rjz$~(&m6  
 } :A"GO c,  
 GlobalFreePtr(lpData); 4;=+qb  
 if(nCount==1) ]sB-}n)  
  m_Number.Format("%d picture captured.",nCount); | bDUekjR  
 else ,Tjc\;~%  
  m_Number.Format("%d pictures captured.",nCount); _ ZMoPEW  
  UpdateData(FALSE); Q3T@=z2j%  
} e-Mei7{%  
^-Bx zOp  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) C8ek{o)%W  
{ Dg W*Br8<  
 if(pMsg -> message == WM_KEYDOWN) Y'H|Tk^`  
 { r1ao=N  
  if(pMsg -> wParam == VK_ESCAPE) 2M@,g8O+B=  
   return TRUE; ~qT5F)$B-  
  if(pMsg -> wParam == VK_RETURN)  b"iPuN!p  
   return TRUE; Dn~c  
 } yH/m@#  
 return CDialog::PreTranslateMessage(pMsg); _TEjB:9eY  
} MfQ 9d9  
HHzAmHt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) b@`h]]~:  
{ `|(S]xPHM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ^Y,nv,gYn  
  SaveBmp(); W"$sN8K>)  
  return FALSE; +VT/ c  
} C%H{"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =# 0f4z  
 CMenu pop; F=EG#<@u  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); juIi-*R!  
 CMenu*pMenu=pop.GetSubMenu(0); OXp(rJ*bK  
 pMenu->SetDefaultItem(ID_EXITICON); #q?'<''d,  
 CPoint pt; bf@H(gCW=  
 GetCursorPos(&pt); Kjzo>fIC{  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); PUcxlD/a}  
 if(id==ID_EXITICON) "Rc Ny~  
  DeleteIcon(); Y].,}}9k  
 else if(id==ID_EXIT) 8}C_/qeM  
  OnCancel(); , Ox$W  
 return FALSE; 7 x#QkImQ  
} []OmztB  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gxPu/VD4  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) %[B^b)2  
 AddIcon(); /xq^]0xy  
 return res; #|8Ia:=s  
} >UNx<=ry  
z* k(` '  
void CCaptureDlg::AddIcon() h>k[  
{ XCvL`  
 NOTIFYICONDATA data; Cg_9V4h.C  
 data.cbSize=sizeof(NOTIFYICONDATA); u'`eCrKT*  
 CString tip; SFJ"(ey$  
 tip.LoadString(IDS_ICONTIP); lV".-:u_  
 data.hIcon=GetIcon(0); q]Vxf!0*>  
 data.hWnd=GetSafeHwnd(); _TntZv.?  
 strcpy(data.szTip,tip); #;D@`.#\  
 data.uCallbackMessage=IDM_SHELL; '2XIeR  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; sD#*W<  
 data.uID=98; y~Z7sx0  
 Shell_NotifyIcon(NIM_ADD,&data); ghU~H4[xD  
 ShowWindow(SW_HIDE); y7^E`LKK  
 bTray=TRUE; {f"oqry_g  
} ~)CGwST[  
 Z2a~1BL  
void CCaptureDlg::DeleteIcon() 7w\L<vFm  
{ };Pdn7;1G:  
 NOTIFYICONDATA data; g~p43sVV  
 data.cbSize=sizeof(NOTIFYICONDATA); fj|X`,TiZ;  
 data.hWnd=GetSafeHwnd(); g286 P_a`*  
 data.uID=98; +N}yqgE  
 Shell_NotifyIcon(NIM_DELETE,&data); ;"B@QPX  
 ShowWindow(SW_SHOW); []:&WA 9N  
 SetForegroundWindow(); (h"-#q8$  
 ShowWindow(SW_SHOWNORMAL); PCx:  
 bTray=FALSE; HjCe/J ;  
} w~4T.l#1  
 I9Lt>*  
void CCaptureDlg::OnChange() [,L>5:T  
{ T].Xx`  
 RegisterHotkey(); zb3,2D+P  
} i"#pk"@`  
Yz)+UF,  
BOOL CCaptureDlg::RegisterHotkey() ^u(-v/D9  
{ "% l``  
 UpdateData(); [>D5(O  
 UCHAR mask=0; |"g+p)A  
 UCHAR key=0; IN_O!c0e  
 if(m_bControl) Z H2   
  mask|=4; }2h!  
 if(m_bAlt) @d|3c7` A  
  mask|=2; 2Q%*` vCuV  
 if(m_bShift) U4=m>Ty  
  mask|=1;  qC6@  
  key=Key_Table[m_Key.GetCurSel()]; n|fKwWB\  
 if(bRegistered){ *b7evU *1  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); % oJH 6F  
  bRegistered=FALSE; K;7ea47m N  
 } {X 5G  
 cMask=mask; ra;:  
 cKey=key; 4s9q Q8?  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); m yy*rt  
 return bRegistered; < &kl:|  
} osn ,kD*  
+2+|zXmT  
  四、小结 oT0:Ny  
[gGo^^aW#  
  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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