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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: cNX0.7Ls  
  d=TZaVL$$  
  一、实现方法 %SwN/rna  
z g@,s"`>  
  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: Ls<.&3X2  
I-fjqo3  
#pragma data_seg("shareddata") RW!_Zz Z  
HHOOK hHook =NULL; //钩子句柄 #9{9T"ed  
UINT nHookCount =0; //挂接的程序数目 9'qU4I  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Y SvZ7G(m>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4@qKML  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey C;T:'Uws  
static int KeyCount =0; ?9_RI(a.}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ># q2KXh  
#pragma data_seg() `+4>NT6cu9  
,<^7~d{{3m  
  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。 UogkQ& B  
c\n&Z'vK  
  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: V>{G$(v$  
Bc/'LI.%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR M<A*{@4$w&  
cKey,UCHAR cMask) X_7cwPY  
{ =?*6lS}gy  
 BOOL bAdded=FALSE; Lqt.S|  
 for(int index=0;index<MAX_KEY;index++){ Koi  
  if(hCallWnd[index]==0){ aX oD{zA  
   hCallWnd[index]=hWnd; tA?cHDp4E  
   HotKey[index]=cKey; >d`XR"_e  
   HotKeyMask[index]=cMask; hr T_0FZV  
   bAdded=TRUE; yU-^w^4  
   KeyCount++; |NbF3 fD  
   break; "funFvY  
  } 8$|< `:~J  
 } WMo   
 return bAdded; YpAJ7 E|7  
} "k8Yc<`u  
//删除热键 b.`<T "y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;{n@hM*O  
{ e b])=  
 BOOL bRemoved=FALSE; NV|[.g=lg  
 for(int index=0;index<MAX_KEY;index++){ 6z/ct|n  
  if(hCallWnd[index]==hWnd){ Zy}Qc")Z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D^?jLfW8  
    hCallWnd[index]=NULL; `m~x*)L#  
    HotKey[index]=0; _^)Wrf+  
    HotKeyMask[index]=0; 4@K9%  
    bRemoved=TRUE; 6I$laHx?  
    KeyCount--; LP{{PT.&X  
    break; aUdbN&G  
   } \(nb >K  
  } -/#VD&MJO=  
 } SWAggW)  
 return bRemoved; 73-*| @6  
} 5/v,|  
y^rcUPLT  
YF+hN\  
  DLL中的钩子函数如下: ~*3obZ2>2  
3'd(=hJ45$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ){AtV&{$  
{ pJ` M5pF  
 BOOL bProcessed=FALSE; A9*( O)  
 if(HC_ACTION==nCode) [j6EzMN  
 { Quc,,#u  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 yGNZw7^(  
   switch(wParam) uCc.dluU  
   {  ;XJK*QDN  
    case VK_MENU: r'kUU] j9  
     MaskBits&=~ALTBIT; cTA8F"UGD  
     break; n{>Ge,enP0  
    case VK_CONTROL: |H:JwxH  
     MaskBits&=~CTRLBIT; .6,+q2tyk,  
     break; (xp<@-  
    case VK_SHIFT: Ywj=6 +;  
     MaskBits&=~SHIFTBIT; CDDx %#eG>  
     break; 7x/S4Gs'4  
    default: //judge the key and send message E<[_L!2  
     break; -BY'E$]4  
   } bYuQ"K A$  
   for(int index=0;index<MAX_KEY;index++){ 0_}^IiG  
    if(hCallWnd[index]==NULL) wq[\Fb`  
     continue; Oz\mIVC#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2Xu?/yd  
    { &1O!guq%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9Tgl/}q)  
     bProcessed=TRUE; /5:f[-\s  
    } i+/:^tc;  
   } )Ir_:lk  
  } $/\b`ID  
  else if((lParam&0xc000ffff)==1){ //有键按下 T ;Ga G  
   switch(wParam) NDw+bR-  
   { 59?@55  
    case VK_MENU: -#=y   
     MaskBits|=ALTBIT; .k{omr&Dy5  
     break; |G2hm8 Y  
    case VK_CONTROL: \JJ>y  
     MaskBits|=CTRLBIT; "2>I?  
     break; 0jS"PH?[  
    case VK_SHIFT: ]r #YU0  
     MaskBits|=SHIFTBIT; g$&uD  
     break; :NB,Dz+i  
    default: //judge the key and send message }E01B_T9z  
     break; XA cpLj]  
   } ep"YGx  
   for(int index=0;index<MAX_KEY;index++){ 64Ot`=A"  
    if(hCallWnd[index]==NULL) lpW|GFG  
     continue; h)%}O.ueB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Wvhg:vup  
    { }uI(D&?+h  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A),nkw0X  
     bProcessed=TRUE; so* lV  
    } GZL{~7n  
   } J`6X6YZ  
  } tMN^"sjf*  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ~, hPi  
   for(int index=0;index<MAX_KEY;index++){ 0D;MW  
    if(hCallWnd[index]==NULL) $rB20!  
     continue; dx=\Pq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }3tbqFiH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); CgLS2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2b+0}u>a  
   } /?POIn+0o  
  } "W_C%elg  
 } _1z|QC  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4dDDi,)U  
} =F!DwaZ  
u3!aKXnv<  
  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: ^y.e Fz  
S.;>:Dd[K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9m2_zfO[ w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8\-Q(9q(  
IAr  
  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: HaP0;9q  
U] 2fV|Hn  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +k!Y]_&(:f  
{ r]x;JBy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) < V?CM(1C  
 { B]PTe~n^  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 H'Mc]zw_,  
  SaveBmp(); zj!&12w%3  
  return FALSE; $#4J^(I*:  
 } 5XO eYO{  
 …… //其它处理及默认处理 fvajNP  
} V?g@pnN"  
>Z#=<  
Wsn}Y-x  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 RP]hW{:U  
1vcI`8%S+u  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Kt WG2  
zu<8%  
  二、编程步骤 1Aq*|JSk(  
)7mX]@  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; y(pHt  
Ol>"'  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ?^z!yD\  
o E+s8Q  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; lFWN [`H  
P)fv:a  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; b\zRwp  
>uN`q1?l'  
  5、 添加代码,编译运行程序。  \Vis  
BX[92~Bq  
三、程序代码 _VU/j9<+  
,}M@Am0~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ETP}mo  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) d*26;5~\  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ M\wIpRD,  
#if _MSC_VER > 1000 xCH,d:n=  
#pragma once 1y5]+GU'`  
#endif // _MSC_VER > 1000 iSTr;>A  
#ifndef __AFXWIN_H__ QK0  
#error include 'stdafx.h' before including this file for PCH &tFVW[(  
#endif sQ65QJtt0A  
#include "resource.h" // main symbols ; 6Wlu3I  
class CHookApp : public CWinApp _m!TUT8o  
{ W11Wv&  
 public: sIuk  
  CHookApp(); TlEx w0i!  
  // Overrides ^'S0A=1  
  // ClassWizard generated virtual function overrides Lm<"W_  
  //{{AFX_VIRTUAL(CHookApp) ||y5XXs  
 public: 9X8{"J  
  virtual BOOL InitInstance(); )u7*YlU\I  
  virtual int ExitInstance(); Wxl^f?I`:  
  //}}AFX_VIRTUAL !UE' AB  
  //{{AFX_MSG(CHookApp) ~mc7O  
  // NOTE - the ClassWizard will add and remove member functions here. ?3!"js B  
  // DO NOT EDIT what you see in these blocks of generated code ! q<>  
  //}}AFX_MSG W G2 E3y  
  DECLARE_MESSAGE_MAP() 0N3 cC4!  
}; SWr?>dl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Hz$l)g}U  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \1 4"Bgj1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4[z a|t  
BOOL InitHotkey(); u49zc9  
BOOL UnInit(); tE0DST/  
#endif &x{CC@g/  
nu,#y"WQ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ./@!k[  
#include "stdafx.h" #n^P[Zw  
#include "hook.h" -bHQy:  
#include <windowsx.h> .gNWDk0$Y  
#ifdef _DEBUG ]%IcUd}  
#define new DEBUG_NEW :ho)3kB  
#undef THIS_FILE UhCE.# U  
static char THIS_FILE[] = __FILE__; eR r.j  
#endif 0$3\D S<E  
#define MAX_KEY 100 X>mY`$!/  
#define CTRLBIT 0x04 P  F!S  
#define ALTBIT 0x02 4l2i'H  
#define SHIFTBIT 0x01 y@[}FgVOh  
#pragma data_seg("shareddata") \^iPU 27H  
HHOOK hHook =NULL; kLVf}J~?  
UINT nHookCount =0; _Zya GDv  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !3>(fj+QS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT H4LZNko  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey JicAz1P1W  
static int KeyCount =0; =>Y b~r71  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift &LE,.Q34  
#pragma data_seg() ^yUel.N5"  
HINSTANCE hins; l%*KBME  
void VerifyWindow(); PL/as3O^A  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) c0]^V>}cl  
//{{AFX_MSG_MAP(CHookApp) 7N"$~UfC  
// NOTE - the ClassWizard will add and remove mapping macros here. W B)<B  
// DO NOT EDIT what you see in these blocks of generated code! k"|4 LPv[  
//}}AFX_MSG_MAP '3Yci(t+  
END_MESSAGE_MAP() I|lz;i}$  
Z~{0XG\Y  
CHookApp::CHookApp() D<$~bUkxR  
{ <A&mc,kj  
 // TODO: add construction code here, i"%X[(U7  
 // Place all significant initialization in InitInstance /_E8'qlx  
} LZm6\x  
@s J[<V  
CHookApp theApp; `e]L.P_e?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) v4!zB9d  
{ g\&[;v i  
 BOOL bProcessed=FALSE; _ngyai1  
 if(HC_ACTION==nCode) ?)x>GB(9ZN  
 { }fnp}L  
  if((lParam&0xc0000000)==0xc0000000){// Key up kf+]bV  
   switch(wParam)  lk{  
   { XnrOC|P$  
    case VK_MENU: D/jB .  
     MaskBits&=~ALTBIT; ?P[uf  
     break; Z^,C><Yt  
    case VK_CONTROL: 9ctvy?53H  
     MaskBits&=~CTRLBIT; i rMZLc6  
     break; w#eD5y~'oo  
    case VK_SHIFT: tVd\r"0k  
     MaskBits&=~SHIFTBIT; D8N}*4S  
     break; + 8 5]]}I  
    default: //judge the key and send message 2<wuzP|  
     break; -}0S%|#m  
   } Et ty{r}  
   for(int index=0;index<MAX_KEY;index++){  sBY*9I  
    if(hCallWnd[index]==NULL) tWQ_.,ld  
     continue; MB :knj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cVJ"^wgBt  
    { V0 x[sEW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); VO3&!uOd  
     bProcessed=TRUE; kA?a}   
    } %se4aeOrX  
   } B7(~m8:eH7  
  } Q[_{:DJA  
  else if((lParam&0xc000ffff)==1){ //Key down T!5m'Q.  
   switch(wParam) 8 $0D-z  
   { 9@  [R>C  
    case VK_MENU: 9K~2!<  
     MaskBits|=ALTBIT; SV16]Vc  
     break; j*>+^g\Q6  
    case VK_CONTROL: Kdk0#+xtP  
     MaskBits|=CTRLBIT; 1eQ9(hzF  
     break; ~C=I{qzF+  
    case VK_SHIFT: TSqfl/UI  
     MaskBits|=SHIFTBIT; D_ xPa  
     break; !TY9\8JzV  
    default: //judge the key and send message |t*(]U2O0  
     break; t m?[0@<s  
   } n"8vlNeW  
   for(int index=0;index<MAX_KEY;index++) / pzdX%7  
   { S-{[3$  
    if(hCallWnd[index]==NULL) cjt<&b*  
     continue; \#.,@g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'HTr02riY  
    { sHD8#t^{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); py.lGywb_  
     bProcessed=TRUE; /%9D$\  
    } $E3- </ f  
   } e*p7(b-  
  } zWpJ\/k~  
  if(!bProcessed){ \O5`R-  
   for(int index=0;index<MAX_KEY;index++){ 9Z]~c^UB  
    if(hCallWnd[index]==NULL) gRv5l3k  
     continue; #j -bT4!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P'f =r%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m7wD#?lm  
   } CY#|VE M  
  } r(xh5{^x  
 } O6Bs!0,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )o)<5Iqh  
} D7|[:``  
^T@ (`H4@  
BOOL InitHotkey() bh|M]*Pq  
{ yQE|FbiA  
 if(hHook!=NULL){ eznt "Rr2  
  nHookCount++; Hs/ aU_  
  return TRUE; lo*OmAF  
 } AE`X4q  
 else i2KN^"v?N  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); '?dO[iQ$:  
  if(hHook!=NULL) z<aBGG  
   nHookCount++; tJ[yx_mf  
  return (hHook!=NULL); -SZXUN  
} D ]Q,~Y&'  
BOOL UnInit() xY9 #ouF  
{ Fb=(FQ2Y?  
 if(nHookCount>1){ k#Qav1_  
  nHookCount--; bA}9He1  
  return TRUE; 4-;"w;  
 } {Q],rv|;  
 BOOL unhooked = UnhookWindowsHookEx(hHook); FY_.Vp  
 if(unhooked==TRUE){ d%_=r." Y  
  nHookCount=0; 6" fYSn>  
  hHook=NULL; ir/m. ~?  
 } -F=?M+9[  
 return unhooked; VuA7rIF$66  
} k7JE{(Ok  
0$)s? \  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EdFCaW}""  
{ >KHR;W03  
 BOOL bAdded=FALSE; 0/K?'&$yvb  
 for(int index=0;index<MAX_KEY;index++){ u3 k%  
  if(hCallWnd[index]==0){ <knf^D<"  
   hCallWnd[index]=hWnd; $/;D8P5/&=  
   HotKey[index]=cKey; O b'B?  
   HotKeyMask[index]=cMask; ]-[M&i=+&  
   bAdded=TRUE; :5Vk+s]8  
   KeyCount++;  [U9b_`  
   break; xi['knUi2-  
  } J1OZG6|e  
 } G8=2=/ !  
 return bAdded; e??tp]PLn  
} ~C[p}MED  
 gGF]Dq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p3>(ZWPNV  
{ )_bc:6Q  
 BOOL bRemoved=FALSE; '%Og9Bgd+  
 for(int index=0;index<MAX_KEY;index++){ MMlryn||1  
  if(hCallWnd[index]==hWnd){ kQ~2mU  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {!!df.h  
    hCallWnd[index]=NULL; ,/0Q($oz  
    HotKey[index]=0; rR`'l=,t  
    HotKeyMask[index]=0; \kSoDY`l&  
    bRemoved=TRUE; $pW6a %7  
    KeyCount--; iV9wqUkMv  
    break; 'a.n  
   } @}[>*Xy%  
  } Mx9#YJ?t~  
 } PWeCk2xH  
 return bRemoved; sF9{(Us  
} +&hhj~I.  
<0lXJqd  
void VerifyWindow() aAM!;3j]B`  
{ F6>K FU8  
 for(int i=0;i<MAX_KEY;i++){ 2iOn\ ^]x  
  if(hCallWnd!=NULL){ 1ocd$)B|}  
   if(!IsWindow(hCallWnd)){ TdGda'C  
    hCallWnd=NULL; >tF3|:\  
    HotKey=0; 'Cv,:Q  
    HotKeyMask=0; ZEY="pf  
    KeyCount--; TljN!nv]  
   } *u LOoq  
  } k(hYNmmo j  
 } HIiMq'H^  
} #a1zk\R3  
LX<arHz  
BOOL CHookApp::InitInstance() #,dNhUV#  
{ ?%RAX CK  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); be&5vl  
 hins=AfxGetInstanceHandle(); L8OW@)|  
 InitHotkey(); 6Gt~tlt:L  
 return CWinApp::InitInstance(); 9%fd\o@X  
} oCtg{*vp  
$cl[Qcw  
int CHookApp::ExitInstance() ;]*V6!6RR  
{ =^liong0  
 VerifyWindow(); lMkDLobos  
 UnInit(); .CJQ]ECl7p  
 return CWinApp::ExitInstance(); Xae0xs  
} d)@Hx8  
EY3x o-H  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file _#[~?g`  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) SCwAAE9s]  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ RF3?q6j ,  
#if _MSC_VER > 1000 LDg" s0n#  
#pragma once .'`7JU#{  
#endif // _MSC_VER > 1000 RLnsy,  
"53'FRj_\  
class CCaptureDlg : public CDialog jA'qXc+\  
{ t "y[  
 // Construction v[$-)vs*ag  
 public: Yz<,`w5/6~  
  BOOL bTray; eAqSY s!1  
  BOOL bRegistered; F; upb5  
  BOOL RegisterHotkey(); zzlqj){F  
  UCHAR cKey; JFOto,6L:  
  UCHAR cMask; XKp$v']u  
  void DeleteIcon(); K4T#8K]aZF  
  void AddIcon(); $}&r.=J".  
  UINT nCount; cnJL*{H<2  
  void SaveBmp(); '5^$v{  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor g/*x;d=  
  // Dialog Data m(2(Caz{  
  //{{AFX_DATA(CCaptureDlg) "n<rP 3y  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7JC^+ rk  
  CComboBox m_Key; c}XuzgSY  
  BOOL m_bControl; 2bJqZ,@  
  BOOL m_bAlt; Lj]I7ICNh  
  BOOL m_bShift; .&z/p3 1  
  CString m_Path; T6/d[SH>  
  CString m_Number; T >pz/7gb  
  //}}AFX_DATA (I<]@7>  
  // ClassWizard generated virtual function overrides f/1soGA  
  //{{AFX_VIRTUAL(CCaptureDlg) z-9@K<`H  
 public: *[ ' n8Z  
  virtual BOOL PreTranslateMessage(MSG* pMsg); i 4sd29v  
 protected: D8 S?xK7[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @.rVg XE=!  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^oZz,q  
  //}}AFX_VIRTUAL ~* R:UTBtw  
  // Implementation L&D+0p^lI  
 protected: P<. TiF?@  
  HICON m_hIcon; T/[8w  
  // Generated message map functions xXa* d  
  //{{AFX_MSG(CCaptureDlg) S7|6dwQ&  
  virtual BOOL OnInitDialog(); xg:r5Z/|)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 25bbuhss  
  afx_msg void OnPaint(); D\~s$.6B  
  afx_msg HCURSOR OnQueryDragIcon(); ;N+ v x  
  virtual void OnCancel();  {J aulg  
  afx_msg void OnAbout(); ?nVwT[  
  afx_msg void OnBrowse(); Vki'pAN  
  afx_msg void OnChange(); 5,Q3#f~!  
 //}}AFX_MSG <V> [H7  
 DECLARE_MESSAGE_MAP() rwZI;t$hf  
}; tQ:g#EqL9B  
#endif tVAWc$3T  
C(=$0FIR  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file h;q= <[h\  
#include "stdafx.h" m=s aUhI*9  
#include "Capture.h" {"^LUw8fd  
#include "CaptureDlg.h" q+j.)e  
#include <windowsx.h> s=[Tm}[  
#pragma comment(lib,"hook.lib") uq/z.m  
#ifdef _DEBUG ~RdD6V  
#define new DEBUG_NEW '7'*+sgi$  
#undef THIS_FILE Mx-? &  
static char THIS_FILE[] = __FILE__; ,H_b@$]n8  
#endif 7m4gGkX#r  
#define IDM_SHELL WM_USER+1 "PFczoRZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E?VPCx  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0r4,27w  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; R04%;p:k#  
class CAboutDlg : public CDialog k!&G ;6O-  
{ |igr3p5Fw  
 public: Z$UPLg3=;_  
  CAboutDlg(); bCV3h3<  
  // Dialog Data TO(2n8'fdO  
  //{{AFX_DATA(CAboutDlg) ZsgJ6 Y  
  enum { IDD = IDD_ABOUTBOX }; ( M > C  
  //}}AFX_DATA S1Z~-i*w  
  // ClassWizard generated virtual function overrides dkHye>  
  //{{AFX_VIRTUAL(CAboutDlg) .Lwp`{F/  
 protected: .J/x@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kiah,7V/  
  //}}AFX_VIRTUAL :Dh\  
  // Implementation j{U#g8  
 protected: LnwI 7uvq  
  //{{AFX_MSG(CAboutDlg) xJ-(]cO'  
  //}}AFX_MSG  0 |/:m  
  DECLARE_MESSAGE_MAP() fbl8:c)I  
}; U{ZE|b. ?b  
r8R]0\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) YmBo/IM  
{ ]+U:8*  
 //{{AFX_DATA_INIT(CAboutDlg) )A@ }mIs"  
 //}}AFX_DATA_INIT Ok0zgi  
} tQrF A2F  
.C 6wsmQ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @Cnn8Y&'  
{ {OH @z!+d  
 CDialog::DoDataExchange(pDX); P#8+GN+bF  
 //{{AFX_DATA_MAP(CAboutDlg) aEO``W  
 //}}AFX_DATA_MAP 4R c_C0O  
} 3?}\Hw  
?g ~w6|U(r  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v$WH#;(\  
 //{{AFX_MSG_MAP(CAboutDlg) FnZMW, P  
 // No message handlers %OV)O-  
 //}}AFX_MSG_MAP jX9{Ki"  
END_MESSAGE_MAP() g9T9TQ-O  
C >@T+xOZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ak SUk)}e  
: CDialog(CCaptureDlg::IDD, pParent) m L#%H(  
{ lmsO 6=I4F  
 //{{AFX_DATA_INIT(CCaptureDlg) 35;UE2d)<  
  m_bControl = FALSE; x|7vN E=Q  
  m_bAlt = FALSE; {?!0<0  
  m_bShift = FALSE; /k$H"'`j4  
  m_Path = _T("c:\\"); 'aN`z3T  
  m_Number = _T("0 picture captured."); =\QKzQ'BC  
  nCount=0; Q5ZZ4`K!  
  bRegistered=FALSE; I[x+7Y0k9  
  bTray=FALSE; %2S+G?$M?  
 //}}AFX_DATA_INIT }L!%^siG_  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 vp[;rDsIJ$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); LR(Q.x  
} `rwzCwA1  
N!W# N$  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5xS ze;  
{ $i|c6&  
 CDialog::DoDataExchange(pDX); O<*l"fw3  
 //{{AFX_DATA_MAP(CCaptureDlg) b`9J1p.;  
  DDX_Control(pDX, IDC_KEY, m_Key); ,k9@%{4 l  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); EMTAl;P  
  DDX_Check(pDX, IDC_ALT, m_bAlt); u|G&CV#r  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); vqeWt[W v  
  DDX_Text(pDX, IDC_PATH, m_Path); XEUy,>mR  
  DDX_Text(pDX, IDC_NUMBER, m_Number); S-5|t]LV  
 //}}AFX_DATA_MAP $ ]fautQlt  
} GKk> ;X-  
J{69iQ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Yn~N;VUA  
//{{AFX_MSG_MAP(CCaptureDlg) 8et*q3D7`  
 ON_WM_SYSCOMMAND() hja;d1yH  
 ON_WM_PAINT() kPuI'EPK  
 ON_WM_QUERYDRAGICON() ~Z{IdE  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ( !THd  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'Nqa=_<WW  
 ON_BN_CLICKED(ID_CHANGE, OnChange) E7CeE6U  
//}}AFX_MSG_MAP I6.!0.G  
END_MESSAGE_MAP() (V06cb*42[  
7\T~K Yb?  
BOOL CCaptureDlg::OnInitDialog() hx5oTJR  
{ G\;a_]Q  
 CDialog::OnInitDialog(); ytDp 4x<W)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7 6} a  
 ASSERT(IDM_ABOUTBOX < 0xF000); `R\nw)xq  
 CMenu* pSysMenu = GetSystemMenu(FALSE); z5> {(iY;,  
 if (pSysMenu != NULL) +=N!37+G  
 { as k76  e  
  CString strAboutMenu; x!i(M>P  
  strAboutMenu.LoadString(IDS_ABOUTBOX); *l-f">?|  
  if (!strAboutMenu.IsEmpty()) &A1~x!`  
  { >l>;"R9N  
   pSysMenu->AppendMenu(MF_SEPARATOR); =_"[ &^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); f Yt y7  
  } <mk'n6B  
 } VEc^Ap1?'  
 SetIcon(m_hIcon, TRUE); // Set big icon 1 7..  
 SetIcon(m_hIcon, FALSE); // Set small icon <'N(`.&3C  
 m_Key.SetCurSel(0); xMpQPTte  
 RegisterHotkey(); /A4^l]H;+3  
 CMenu* pMenu=GetSystemMenu(FALSE); &Q>tV+*  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); k^%Kw(/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fqY; > Z  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^^;#Si  
 return TRUE; // return TRUE unless you set the focus to a control 9_4bw9 A  
} nYvx[ zq?^  
8M~^/Zc  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) y$Y*%D^w  
{ ov9+6'zya  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) VJf|r#2  
 { Uc[ @]  
  CAboutDlg dlgAbout; ?x\tE]  
  dlgAbout.DoModal(); $oo`]R_   
 } d41DcgG'j(  
 else m 4r!Ck|  
 { q b[UA5S\`  
  CDialog::OnSysCommand(nID, lParam); :g+5cs  
 } sN_c4"\q  
} O'i!}$=g  
oRALhaI  
void CCaptureDlg::OnPaint() 70MSP;^  
{ ?6#F9\  
 if (IsIconic()) ~CRd0T[^  
 { ;UnJrP-if  
  CPaintDC dc(this); // device context for painting j} .,|7X  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); }}Kj b  
  // Center icon in client rectangle P\nz;}nv  
  int cxIcon = GetSystemMetrics(SM_CXICON); h;lg^zlTb  
  int cyIcon = GetSystemMetrics(SM_CYICON); "{@Q..hxC  
  CRect rect; ) u(Gf*t  
  GetClientRect(&rect); 5L!cS+QNU  
  int x = (rect.Width() - cxIcon + 1) / 2; nl\l7/}6  
  int y = (rect.Height() - cyIcon + 1) / 2; je[1>\3W  
  // Draw the icon e*Gt%'  
  dc.DrawIcon(x, y, m_hIcon); 2K~<_.S  
 } ]}za  
 else JK/VIu&!  
 { }iE!( l  
  CDialog::OnPaint(); *%#Sa~iPo  
 } zF([{5r[!)  
} o]jPG  
?B5934X  
HCURSOR CCaptureDlg::OnQueryDragIcon()  <j<V{Wc  
{ gAPD y/wM  
 return (HCURSOR) m_hIcon; 8=T[Y`;x  
} #sRkKl|  
|RS(QU<QE  
void CCaptureDlg::OnCancel() \Aa{]t  
{ OBm#E}  
 if(bTray) 1OOMqFn}L  
  DeleteIcon(); 4]P5k6 nV  
  CDialog::OnCancel(); ToXgl4:kd  
} !VoAN5#;  
R2` -*PZ_  
void CCaptureDlg::OnAbout() #=81`u  
{ ]aDU*tk  
 CAboutDlg dlg; R?E< }\!  
 dlg.DoModal(); Xk]:]pl4W  
} /]@1IC{Lk  
a:V2(nY  
void CCaptureDlg::OnBrowse() 2Vwv#NAV k  
{ 1!P\x=Nn_  
 CString str; IBn+4 2V  
 BROWSEINFO bi; Hdxon@,+cd  
 char name[MAX_PATH]; _Xe" +  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Gkr?M^@K  
 bi.hwndOwner=GetSafeHwnd(); \kS:u}Ip!  
 bi.pszDisplayName=name; oz[Mt i*  
 bi.lpszTitle="Select folder"; H-g CY|W  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; |3SM  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); "+{>"_KV  
 if(idl==NULL) 9ZVzIv(   
  return; >bUxb-8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); l =X6m(  
 str.ReleaseBuffer(); z,+LPr  
 m_Path=str; 6VQe?oh  
 if(str.GetAt(str.GetLength()-1)!='\\')  z:p;Wm  
  m_Path+="\\"; M}Obvl  
 UpdateData(FALSE); )&F]j  
} HVLj(_ A  
8TH fFL  
void CCaptureDlg::SaveBmp() XN Gw@$  
{ j-%@A`j;  
 CDC dc; RO!em~{D*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); S@^o=B]]  
 CBitmap bm; Wq"5-U;:w  
 int Width=GetSystemMetrics(SM_CXSCREEN); >&Ios<67g  
 int Height=GetSystemMetrics(SM_CYSCREEN); OC5\3H  
 bm.CreateCompatibleBitmap(&dc,Width,Height); nb|KIW  
 CDC tdc; ,CED%  
 tdc.CreateCompatibleDC(&dc); p2I9t|  
 CBitmap*pOld=tdc.SelectObject(&bm); l RM7s(^l  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Iss)7I  
 tdc.SelectObject(pOld); ON-zhT?v  
 BITMAP btm; 41XS/# M$*  
 bm.GetBitmap(&btm); :oeDksld  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 6>)oG6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); uozK'L  
 BITMAPINFOHEADER bih; ;%`oS.69  
 bih.biBitCount=btm.bmBitsPixel; q dQQt5Y'm  
 bih.biClrImportant=0; RqU^Q*/sF  
 bih.biClrUsed=0; ?igA+(.  
 bih.biCompression=0; sL",Ho  
 bih.biHeight=btm.bmHeight; P ?A:0a  
 bih.biPlanes=1; Muay6b?  
 bih.biSize=sizeof(BITMAPINFOHEADER); WXmR{za   
 bih.biSizeImage=size; d$}!x[g$Z  
 bih.biWidth=btm.bmWidth; ?qJt4Om  
 bih.biXPelsPerMeter=0; F[5sFk M7  
 bih.biYPelsPerMeter=0; :v Do{My^1  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); dc=}c/6x  
 static int filecount=0; x;@wtd*QB  
 CString name; !l|fzS8g  
 name.Format("pict%04d.bmp",filecount++); *u ^mf~  
 name=m_Path+name; y3Qb2l  
 BITMAPFILEHEADER bfh; ggL^*MV  
 bfh.bfReserved1=bfh.bfReserved2=0; '?O_(%3F0  
 bfh.bfType=((WORD)('M'<< 8)|'B'); D3(rD]c0{  
 bfh.bfSize=54+size; 3`+Bq+  
 bfh.bfOffBits=54; N% !TFQf  
 CFile bf; VOkSR6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Gv\:Agi  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;^f ;<  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); CBKLct>  
  bf.WriteHuge(lpData,size); );!IGcgF  
  bf.Close(); < .knM  
  nCount++; AV]7l}-  
 } k/,7FDO?m  
 GlobalFreePtr(lpData); ~Iz{@Ep*  
 if(nCount==1) nmWo:ox4;(  
  m_Number.Format("%d picture captured.",nCount); pybE0]   
 else #<o=W#[  
  m_Number.Format("%d pictures captured.",nCount); X4dxH_@  
  UpdateData(FALSE); ^hRx{A  
} 8~j1  
k}hTSL  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) G<W;HMj2  
{ m'PU0x  
 if(pMsg -> message == WM_KEYDOWN) ]y\Wc0 q  
 { _L% =Q ulu  
  if(pMsg -> wParam == VK_ESCAPE) pZ)N,O3  
   return TRUE; Rc2JgV  
  if(pMsg -> wParam == VK_RETURN) (TTS-(  
   return TRUE; iPCDxDLN3V  
 } xtFGj,N  
 return CDialog::PreTranslateMessage(pMsg); a\ZNNk  
} c1sVdM}|  
G/N1[)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Msst:}QY  
{ ]S+KH \2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Y_= ]w1  
  SaveBmp(); 5#U=x ,7e  
  return FALSE; k{C03=xk  
} zFm:=,9  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ " 7g\X$  
 CMenu pop; `6RR/~kP(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); B*OBXN>'P  
 CMenu*pMenu=pop.GetSubMenu(0); wO&+Bb\=  
 pMenu->SetDefaultItem(ID_EXITICON); F S!D  
 CPoint pt; *nx$r[Mqj  
 GetCursorPos(&pt); V{C{y5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 5*\]F}  
 if(id==ID_EXITICON) t|?eNKVV9'  
  DeleteIcon(); V: n\skM  
 else if(id==ID_EXIT) d=eIsP'h  
  OnCancel(); FSD~Q&9&  
 return FALSE; F10TvJ U  
} [9d4 0>e  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `Rx\wfr}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _V,bvHWlM  
 AddIcon(); \\P*w$c   
 return res; cq"#[y$r  
} C$4!|Wg3  
BFswqp:  
void CCaptureDlg::AddIcon() a\B'Qe+  
{ -8Q}*Z  
 NOTIFYICONDATA data; !rTkH4!_  
 data.cbSize=sizeof(NOTIFYICONDATA); @iBaJ"*,  
 CString tip; 2*5pjd{Kt  
 tip.LoadString(IDS_ICONTIP); o@[oI\Vr!  
 data.hIcon=GetIcon(0); cD ?'lB-  
 data.hWnd=GetSafeHwnd(); fk2p}  
 strcpy(data.szTip,tip); ows 3%  
 data.uCallbackMessage=IDM_SHELL; +} x\|O  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; O39f  
 data.uID=98; |ngv{g  
 Shell_NotifyIcon(NIM_ADD,&data); fL~@v-l#~  
 ShowWindow(SW_HIDE); !g4u<7  
 bTray=TRUE; ymb{rKkN3  
} m[qW)N:w  
_)ZxD--Qg  
void CCaptureDlg::DeleteIcon() ;T :]?5W!  
{ pEq }b+-  
 NOTIFYICONDATA data; 4u= v  
 data.cbSize=sizeof(NOTIFYICONDATA); 2= zw !  
 data.hWnd=GetSafeHwnd(); ,}/6Za  
 data.uID=98; Gz:ell$  
 Shell_NotifyIcon(NIM_DELETE,&data); UsgrI>|l  
 ShowWindow(SW_SHOW); ?izl#?  
 SetForegroundWindow(); p&2oe\j$,  
 ShowWindow(SW_SHOWNORMAL); .`jYrW-k  
 bTray=FALSE; (*Z:ByA  
} ?T)M z q}  
X16vvsjw5  
void CCaptureDlg::OnChange() l#TE$d^ym  
{ "t%Jj89a\  
 RegisterHotkey(); 1ZY~qP+n+  
} wwE3N[  
?N=`}}Ky-  
BOOL CCaptureDlg::RegisterHotkey() <UwYI_OX  
{ 6 IRa$h>H  
 UpdateData(); ^$s&bH'8  
 UCHAR mask=0; y I}>  
 UCHAR key=0; kD}vK+  
 if(m_bControl) RT<HiVr`  
  mask|=4; >%LY0(hY3  
 if(m_bAlt) rgF4 W8  
  mask|=2; h_5CWQSi  
 if(m_bShift) O!P7Wu  
  mask|=1; q!{>Nlk  
  key=Key_Table[m_Key.GetCurSel()]; nh+Hwj#(x  
 if(bRegistered){ 8cGoo u6  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Ey)ey-'\  
  bRegistered=FALSE; D2I|Z  
 } (0["|h32,  
 cMask=mask; 7Y5.GW\^  
 cKey=key; N(%(B  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ZF@$3   
 return bRegistered; Of>2m<  
} Hu+GN3`sx^  
r@EHn[w  
  四、小结 x/ix%!8J  
.Nk5W%7]=  
  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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