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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: ?v>ET2wD  
  L|bwZ,M=}?  
  一、实现方法 P) 3mX.(}  
OO[F E3F  
  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: ^&y$Wd]6  
jck}" N  
#pragma data_seg("shareddata") K2%w0ohC  
HHOOK hHook =NULL; //钩子句柄 a5a($D  
UINT nHookCount =0; //挂接的程序数目 3U_2!zF3_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 yR(x+ Gs{]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 o,|[GhtHqs  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Xy5e5K  
static int KeyCount =0; ?-^~f  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Kq i4hK  
#pragma data_seg() Um&(&?Xf  
M|:UwqV>  
  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。 " Hd|7F'u=  
x?&$ci  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: \7CGUB>L  
Q-1vw6d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?lP':'P  
cKey,UCHAR cMask) 'C"9QfK  
{ Ol!ntNhXm  
 BOOL bAdded=FALSE; s6>ZREf#J  
 for(int index=0;index<MAX_KEY;index++){ qvPtyc^fN  
  if(hCallWnd[index]==0){ 8<Hf" M  
   hCallWnd[index]=hWnd; 720DV +o  
   HotKey[index]=cKey; eUg~)m5G  
   HotKeyMask[index]=cMask; 8 @tV9+u  
   bAdded=TRUE; =Q\r?(Iy  
   KeyCount++; Dc,I7F|%  
   break; EY tQw(!Q  
  } 1YH+d0UGn  
 } t<#h$}=:Vt  
 return bAdded; irfp!(r  
} 4ecP*g  
//删除热键 '*3h!lW1.  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I1X-s  
{ d@qsdYu-*  
 BOOL bRemoved=FALSE; Y=Kc'x[,Zj  
 for(int index=0;index<MAX_KEY;index++){ ;n 7/O5M|  
  if(hCallWnd[index]==hWnd){ .X;3,D[w  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >6?__v]9G  
    hCallWnd[index]=NULL; i*Z" Me  
    HotKey[index]=0; !_Wi!Vr_  
    HotKeyMask[index]=0; B8}Nvz /  
    bRemoved=TRUE; !4X f~P  
    KeyCount--; [C'JH//q*t  
    break; R#I0|;q4|p  
   } \pVXimam  
  } z*!%g[3I  
 } \RG8{G,  
 return bRemoved; 5;YMqUkw  
} 2%_vXo=I  
'!eKTC>  
Kkm>e{0)AY  
  DLL中的钩子函数如下: rp ;b" q  
=Lf,?"S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) IhVO@KJI  
{ 7Mg=b%IYs  
 BOOL bProcessed=FALSE; `)_dS&_\  
 if(HC_ACTION==nCode) )!P)U(*v  
 { 3v1iy / /  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9[.8cg*  
   switch(wParam) 24z< gO  
   {  )mF5Vw"  
    case VK_MENU: +nJgl8'^y  
     MaskBits&=~ALTBIT; &B6Ep6QS  
     break; 4b98Ks Yg  
    case VK_CONTROL: .K1FKC$C  
     MaskBits&=~CTRLBIT; -;^j:L{   
     break; NTYg[VTr  
    case VK_SHIFT: d?A 0MKnl  
     MaskBits&=~SHIFTBIT; SAy=WV  
     break; h4 T5+~rw  
    default: //judge the key and send message {y=j?lD  
     break; qVH1}9_  
   } .y!<t}  
   for(int index=0;index<MAX_KEY;index++){ PoG-Rqe  
    if(hCallWnd[index]==NULL) e4? >-  
     continue; H9YW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >n'o*gZM  
    { DH\0z[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); xMTKf+7  
     bProcessed=TRUE; `p2+&&]S  
    } DtXrWS/  
   } |}=acc/  
  } 3G}x;Cp\D  
  else if((lParam&0xc000ffff)==1){ //有键按下 l]Ax:Z  
   switch(wParam) A kC1z73<  
   { K,+LG7ec  
    case VK_MENU: p@xf^[50k  
     MaskBits|=ALTBIT; RtTJ5@V(  
     break; |H;F7Y_  
    case VK_CONTROL: Q(wx nm  
     MaskBits|=CTRLBIT; J;.wXS_U8  
     break; PgtJ3oq [}  
    case VK_SHIFT: {.C!i{|  
     MaskBits|=SHIFTBIT; % 5M/s'O?i  
     break; ;z}i-cNae  
    default: //judge the key and send message u0|8Tgf  
     break; lr>oYS0  
   } ;oW6 NJ  
   for(int index=0;index<MAX_KEY;index++){ f$e[u E r  
    if(hCallWnd[index]==NULL) "p_J8  
     continue; dJJP3} M/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \^L`7cBL  
    { n}F&1Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \<JSkr[h!"  
     bProcessed=TRUE; nAW:utTB  
    } R!\_rc1/  
   } #5cEV'm;  
  } JEXy%hl  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 U}yW<#$+  
   for(int index=0;index<MAX_KEY;index++){ {XR6>]  
    if(hCallWnd[index]==NULL) :ubV};  
     continue; Ktb\ bw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .7e2YI,S  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?pr9f5  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 {> eXR?s/  
   } `^u>9v-+'  
  } |=Eo?Q_  
 } s.bc>E0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Xe6w|  
} =mS\i663  
SQBa;hvgM  
  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: h`KFL/fT  
@mOH"acGn?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fd +hA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "?]{ %-u  
2D75:@JL}|  
  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: LLk(l#K*  
EYtL_hNp}I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m+`fn;*  
{ .{ocV#{s  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 7mI:| G  
 { sD{Wxv  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \Jx04[=  
  SaveBmp(); +o\:d1y  
  return FALSE; <;vbsksZeH  
 } JlH&??  
 …… //其它处理及默认处理 $Z.7zH  
} 3LAIl913  
`|6'9  
a|%J=k>>  
  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。 {IxA)v-`  
.z]Wyx&/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。 Huy5-[)15  
F<n3  
  二、编程步骤 iP =V8g?L  
l==``  
  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"; *,e:]!*  
^N7e76VwR  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; =d".|k  
 z_F-T=_  
  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; (KFCs^x7wG  
GR&z,  
  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; h]Wr [v  
GGNvu )"  
  5、 添加代码,编译运行程序。 dCE0$3'5  
d;zai]]  
三、程序代码 -&NN51-d\j  
#yI mKEYX  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL D&od?3}E  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) SG6kud\b  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5*+!+V^?X  
#if _MSC_VER > 1000 s8ywKTR-  
#pragma once fmQ_P.c  
#endif // _MSC_VER > 1000 Yk)."r&?  
#ifndef __AFXWIN_H__ f-bVKHt  
#error include 'stdafx.h' before including this file for PCH q;R],7Re  
#endif 3jGWkby0  
#include "resource.h" // main symbols q)Lu_6 mg  
class CHookApp : public CWinApp kW *f.!  
{ y+X2Pl  
 public: Fpm|_f7  
  CHookApp(); S0B|#O%Z  
  // Overrides B|R@5mjm  
  // ClassWizard generated virtual function overrides \DYWy*pe  
  //{{AFX_VIRTUAL(CHookApp) !F1M(zFD  
 public: ,I7E[LU  
  virtual BOOL InitInstance(); o^^rJk  
  virtual int ExitInstance(); *C5R}9O5  
  //}}AFX_VIRTUAL eFaO7mz5V%  
  //{{AFX_MSG(CHookApp) [Yo,*,y31  
  // NOTE - the ClassWizard will add and remove member functions here. tasIDoo+!J  
  // DO NOT EDIT what you see in these blocks of generated code ! ?\vh9  
  //}}AFX_MSG {{B%f.   
  DECLARE_MESSAGE_MAP() 7Nk!1s :  
}; zfc'=ODX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); VRI0W`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _oHNkKQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Fgp]l2*  
BOOL InitHotkey(); v:!Z=I}>  
BOOL UnInit(); ->l%TCHP  
#endif ePr&!Tz#  
ox(j^x]NC  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. pk^K:Xs}  
#include "stdafx.h" 4(|cG7>9-  
#include "hook.h" =osv3>&q  
#include <windowsx.h> gLE:g5v6  
#ifdef _DEBUG SSPHhAeH8  
#define new DEBUG_NEW Jz7!4mu  
#undef THIS_FILE K%a%a6k`  
static char THIS_FILE[] = __FILE__; F$ #U5}Q  
#endif m;'6MHx;  
#define MAX_KEY 100 r~/   
#define CTRLBIT 0x04 L;*ljZ^c  
#define ALTBIT 0x02 {4G%:09~J  
#define SHIFTBIT 0x01 f|B=_p80  
#pragma data_seg("shareddata") Jth[DUH8H  
HHOOK hHook =NULL; eO?p*"p"F  
UINT nHookCount =0; 4Uphfzv3D  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey h-G)o[MA  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #:[t^}  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey  swK-/$#  
static int KeyCount =0; |$vX<. S  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ]^lw*724'>  
#pragma data_seg() )/pU.Z/  
HINSTANCE hins;  f4Xk,1Is  
void VerifyWindow(); 0\[Chja  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) YL]Z<%aKt  
//{{AFX_MSG_MAP(CHookApp) OR%'K2C6S  
// NOTE - the ClassWizard will add and remove mapping macros here. TygW0b 1  
// DO NOT EDIT what you see in these blocks of generated code! LcUh;=r}&  
//}}AFX_MSG_MAP do*EKo  
END_MESSAGE_MAP() CDP U\ZG  
In18_ bc  
CHookApp::CHookApp() \P.I)n`8 y  
{ Hea;?4Vg  
 // TODO: add construction code here, 6LalW5I  
 // Place all significant initialization in InitInstance -(  
} <eQj`HL  
'}fzX2Q#  
CHookApp theApp; 7]blrN]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {ys=Ndo8  
{ nm6h%}xND<  
 BOOL bProcessed=FALSE; p-Kz-+A[  
 if(HC_ACTION==nCode) +y&Tf#.V/A  
 { >8k _n  
  if((lParam&0xc0000000)==0xc0000000){// Key up nQ5n-A&["  
   switch(wParam) 9{ >Ui  
   { .P[ _<8  
    case VK_MENU: S/9DtXQ  
     MaskBits&=~ALTBIT; ] Hztb  
     break; @cFJeOC|  
    case VK_CONTROL: (oEC6F  
     MaskBits&=~CTRLBIT; ioYGZ%RG#  
     break; P} 0%-JC  
    case VK_SHIFT: 2zs73:z  
     MaskBits&=~SHIFTBIT; M<kj_.  
     break; 9f&C  
    default: //judge the key and send message YVHm{A1b0  
     break; >`A9[`$n  
   } AlAYiUw{  
   for(int index=0;index<MAX_KEY;index++){ `HZ;NRr  
    if(hCallWnd[index]==NULL) KG|n  
     continue; LUM@#3&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -uMSe~  
    { EfCx`3~EX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vgfcCcZ_iZ  
     bProcessed=TRUE; g^}8:,F_  
    } mi,E-  
   } 'VzP};  
  } ??M"6k  
  else if((lParam&0xc000ffff)==1){ //Key down VGpWg rmHk  
   switch(wParam) mLP.t%?#   
   { -f%'  
    case VK_MENU: -* WXMzr  
     MaskBits|=ALTBIT; +l9!Fl{MK\  
     break; y5?RVlKJ  
    case VK_CONTROL: c'%-jG)\  
     MaskBits|=CTRLBIT; l49*<nkmq  
     break; gMWjk7  
    case VK_SHIFT: GO` Ru 8  
     MaskBits|=SHIFTBIT; j4jTSLQ\  
     break; Ju96#v+:  
    default: //judge the key and send message F'4w;-ax  
     break; 5=v}W:^v.  
   } ew#B [[  
   for(int index=0;index<MAX_KEY;index++) JtEo'As:[  
   { mH%yGBp_  
    if(hCallWnd[index]==NULL) [5G6VNh=  
     continue; 1.D,W1s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WD]p U  
    { :.Jf0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ADDSCY=,  
     bProcessed=TRUE; ]x RM&=)<  
    } zsX1QN16  
   } &cxRD  
  } qf!p 9@4F[  
  if(!bProcessed){ x=b7':nQ  
   for(int index=0;index<MAX_KEY;index++){ Q=AavKn#  
    if(hCallWnd[index]==NULL) CE#gfP  
     continue; `j,Yb]~s79  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^l9N48]|?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); OSs&r$  
   } $ M`hh{ -  
  } /67 h&j  
 } w80oXXs[#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e+~\+:[?  
} *5%d XixN  
Qw-~>d  
BOOL InitHotkey() Al}6q{E9+8  
{ ; <&*rnH  
 if(hHook!=NULL){ Yw^m  
  nHookCount++; _I@9HC 4  
  return TRUE; (gP)%  
 } ;j[>9g  
 else c6h.iBJ'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |bTPtrT8  
  if(hHook!=NULL) lAb*fafQy  
   nHookCount++; hIy~B['  
  return (hHook!=NULL); ~;l@|7wGz  
} %zG;Q@  
BOOL UnInit() h2Ld[xvCu%  
{ &"yx<&c}  
 if(nHookCount>1){ ;Lc Z`1  
  nHookCount--; `[f*Zv w  
  return TRUE; %j.0G`x9 +  
 } @.$|w>>T  
 BOOL unhooked = UnhookWindowsHookEx(hHook); OI|[roMK  
 if(unhooked==TRUE){ e?0l"  
  nHookCount=0; dP3CG8w5  
  hHook=NULL; ZP@ $Q%up  
 } Ag9vU7  
 return unhooked; 0)Uce=t`  
} u+Y\6~=+  
!%CWZZ 6u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) VCV"S>aVf  
{ d' !]ZWe  
 BOOL bAdded=FALSE; 7%5z p|3  
 for(int index=0;index<MAX_KEY;index++){ zZL6z4g  
  if(hCallWnd[index]==0){ HVi'eNgo  
   hCallWnd[index]=hWnd; SF7\<'4\N  
   HotKey[index]=cKey; J%u=Ucdh  
   HotKeyMask[index]=cMask; Vr]id  
   bAdded=TRUE; J"!vu.[  
   KeyCount++; |cK*~  
   break; VJeu 8ZJ.  
  } 00(on28b  
 } [4YTDEv%  
 return bAdded; #eoome2Q  
} ;Y 00TGU  
i6^twK)j  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w mn+  
{ [$mHv,~  
 BOOL bRemoved=FALSE; {j9{n  
 for(int index=0;index<MAX_KEY;index++){ RSfQNc9Z  
  if(hCallWnd[index]==hWnd){ s3z$e+A8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,|3MG",@@h  
    hCallWnd[index]=NULL; "Lzi+1  
    HotKey[index]=0; NSxoF3  
    HotKeyMask[index]=0; 9Vg?{v!yn  
    bRemoved=TRUE; ND'E8Ke pq  
    KeyCount--; `ZU($!(  
    break; Z-^LKe  
   } sZjQ3*<-r  
  } = I:.X ;  
 } o)h_H;  
 return bRemoved; -)w@f~Q  
} V[RF </2T  
| z9*GY6RU  
void VerifyWindow() *QpMF/<?  
{ B;M?,<%FRU  
 for(int i=0;i<MAX_KEY;i++){ ),0g~'I~D  
  if(hCallWnd!=NULL){ tRs [ YK  
   if(!IsWindow(hCallWnd)){ SzAJ2:qhl  
    hCallWnd=NULL; -z-C*%~  
    HotKey=0; 34`'M+3  
    HotKeyMask=0; lG9bLiFY  
    KeyCount--; *T- <|zQ  
   } 02f~En}>6  
  } H['N  
 } ,$@bE  
} y0Fb_"}  
ojafy}  
BOOL CHookApp::InitInstance() U\ ig:  
{ 9Z|jxy  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?ME6+Z\  
 hins=AfxGetInstanceHandle(); - \ 5v^l  
 InitHotkey(); 5-|:^hU9  
 return CWinApp::InitInstance(); fFMlDg[];  
} D60aH!ft  
KT_!d*  
int CHookApp::ExitInstance() O(#)m>A  
{ /'Ass(=6  
 VerifyWindow(); F5LuSy+v  
 UnInit(); GD&uQ`Y5  
 return CWinApp::ExitInstance(); ls_'')yp  
} /@wg>&L]  
Lco~,OE  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +M./@U*g  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) SAH-p*.  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4~ q5,^kgB  
#if _MSC_VER > 1000 TcyNIx  
#pragma once |!1Y*|Q%s  
#endif // _MSC_VER > 1000 ,MdV;j ~"'  
 Hu^1[#  
class CCaptureDlg : public CDialog 0Be< X  
{ nii A7Ux  
 // Construction 0m7Y>0wC6T  
 public: OPetj.C/a  
  BOOL bTray; !lREaSM  
  BOOL bRegistered; +s"hqm  
  BOOL RegisterHotkey(); gD0eFTN  
  UCHAR cKey; @:;)~V  
  UCHAR cMask; )}''L{k-  
  void DeleteIcon(); _ftI*ni:<  
  void AddIcon(); K}2Erm%A@y  
  UINT nCount; O ~(pg  
  void SaveBmp(); hMzs*gK  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8a &:6Zuo  
  // Dialog Data h&|[eZt?F  
  //{{AFX_DATA(CCaptureDlg) ,f kcp]}  
  enum { IDD = IDD_CAPTURE_DIALOG }; 062,L~&E  
  CComboBox m_Key; 'QG xd!4  
  BOOL m_bControl; kHk px52  
  BOOL m_bAlt; g(nPQOs$u  
  BOOL m_bShift; Q0$8j-1I  
  CString m_Path; +QB"8-  
  CString m_Number; ,V'o4]H  
  //}}AFX_DATA Q.bXM?V)  
  // ClassWizard generated virtual function overrides ImCe K  
  //{{AFX_VIRTUAL(CCaptureDlg) lNNv|YiL  
 public: 2;xIL]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); `+`Z7  
 protected: `{4i)n%e&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3NZK*!@ '  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^m L@e'r  
  //}}AFX_VIRTUAL KTK <gV9:  
  // Implementation T} `x-  
 protected: o-;E>N7t  
  HICON m_hIcon; }L &^xe  
  // Generated message map functions H!vax)%-\  
  //{{AFX_MSG(CCaptureDlg) $v,dz_O*\  
  virtual BOOL OnInitDialog(); &vHoRY  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); c~6>1w7SZ4  
  afx_msg void OnPaint(); 01[NX? qEa  
  afx_msg HCURSOR OnQueryDragIcon(); -HQQw$  
  virtual void OnCancel(); 2Fy>.*,?  
  afx_msg void OnAbout(); B! rTD5a  
  afx_msg void OnBrowse(); U2$d%8G  
  afx_msg void OnChange(); AUeu1(  
 //}}AFX_MSG 9s_vL9u  
 DECLARE_MESSAGE_MAP() ]I-Z]m "  
}; +nUy,S?43  
#endif 6\L0mcXR!  
8'n/?.7cX  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4B=2>k  
#include "stdafx.h" MRQ.`IoS  
#include "Capture.h" INUG*JC6  
#include "CaptureDlg.h" .#wqXRd  
#include <windowsx.h> "ZHW2l Mf  
#pragma comment(lib,"hook.lib") |]QqXE-7  
#ifdef _DEBUG v. %R}Pa  
#define new DEBUG_NEW 2#o>Z4 r{  
#undef THIS_FILE Z 1zVwHa_  
static char THIS_FILE[] = __FILE__; cbeLu'DWB.  
#endif .e3NnOzyxS  
#define IDM_SHELL WM_USER+1 ]FD'5p{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XXbqQhf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N03G>fZ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3Uqr,0$p  
class CAboutDlg : public CDialog '[J<=2&  
{ ^?$WVB  
 public: G,TM-l_uw  
  CAboutDlg(); b k|m4|  
  // Dialog Data 1<+2kBuY  
  //{{AFX_DATA(CAboutDlg) wg ^sGKN  
  enum { IDD = IDD_ABOUTBOX }; 'jmTXWq*  
  //}}AFX_DATA 79nG|Yj|\  
  // ClassWizard generated virtual function overrides ZPc@Zr`z  
  //{{AFX_VIRTUAL(CAboutDlg) <Gav5R c  
 protected: x8!ol2\`<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PpV'F[|,r  
  //}}AFX_VIRTUAL \2nUa ;  
  // Implementation : q ti  
 protected: 3VI4X  
  //{{AFX_MSG(CAboutDlg) DKfE.p)  
  //}}AFX_MSG zR `EU,  
  DECLARE_MESSAGE_MAP() YWMGB#=  
}; PN0VQ/..  
D6CS8 ~"  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7~9S 9  
{ bgS$ {n/  
 //{{AFX_DATA_INIT(CAboutDlg) \(VTt|}By$  
 //}}AFX_DATA_INIT M(RZ/x  
} XGJj3-eW {  
!1n8vzs"c  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) H_EB1"C;\  
{ 6 }4'E  
 CDialog::DoDataExchange(pDX); YhbZ'SJ  
 //{{AFX_DATA_MAP(CAboutDlg) BJgW,huLy  
 //}}AFX_DATA_MAP ZeUvyIG  
} {D? 50Q  
!l|5z G  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) M~WijDj  
 //{{AFX_MSG_MAP(CAboutDlg) w$H^q !(  
 // No message handlers I&MY{f  
 //}}AFX_MSG_MAP Na$Is'F &p  
END_MESSAGE_MAP() |fxA|/ s[<  
lE!a  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) YFE&r  
: CDialog(CCaptureDlg::IDD, pParent) S;~g3DC d  
{ wj[\B*$?  
 //{{AFX_DATA_INIT(CCaptureDlg) %7#-%{  
  m_bControl = FALSE; ]Pry>N3G5  
  m_bAlt = FALSE; *.~6S3}  
  m_bShift = FALSE; {88gW\GL  
  m_Path = _T("c:\\"); /CuXa%Ci^  
  m_Number = _T("0 picture captured."); fMGbODAvY  
  nCount=0; D'L'#/hK  
  bRegistered=FALSE; 6'kS_Zu{<  
  bTray=FALSE; $e\h}A6  
 //}}AFX_DATA_INIT 89n:)|rWq  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 B=>RH!&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); N;A@' tu8  
} &;XAuDw4+i  
28/ ADZ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) KhCzD[tf  
{ q(zJ%Gv)  
 CDialog::DoDataExchange(pDX); Z4A!U~  
 //{{AFX_DATA_MAP(CCaptureDlg) @%tRhG  
  DDX_Control(pDX, IDC_KEY, m_Key); :8 jhiB)  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ddfs8\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ?OE.O/~l  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); A a= u+  
  DDX_Text(pDX, IDC_PATH, m_Path); ;w6>"O$a  
  DDX_Text(pDX, IDC_NUMBER, m_Number); s[K^9wz  
 //}}AFX_DATA_MAP 'mH) d  
} a 4=N9X  
{/X4(;~0  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `((Yc]:7  
//{{AFX_MSG_MAP(CCaptureDlg) d~/q"r1"  
 ON_WM_SYSCOMMAND() 3m>+-})d  
 ON_WM_PAINT() UK$ms~H  
 ON_WM_QUERYDRAGICON() ~go fQ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) eVt$7d?Jw  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) y.=/J8->  
 ON_BN_CLICKED(ID_CHANGE, OnChange) a@@M+9Q  
//}}AFX_MSG_MAP X=6y_^  
END_MESSAGE_MAP() Iq#ZhAk  
KjFK/Og.  
BOOL CCaptureDlg::OnInitDialog() ZxG}ViS4I  
{ JXixYwm  
 CDialog::OnInitDialog(); 7}GK%H-u  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); l" q1?kaVg  
 ASSERT(IDM_ABOUTBOX < 0xF000); kM'"4[,nz  
 CMenu* pSysMenu = GetSystemMenu(FALSE); zF@o2<cD@  
 if (pSysMenu != NULL) 3)ma\+< 6  
 { RP 2_l$  
  CString strAboutMenu; h'i{&mS_b  
  strAboutMenu.LoadString(IDS_ABOUTBOX); YXU|h  
  if (!strAboutMenu.IsEmpty()) zW}[+el }  
  { \.f}W_OF  
   pSysMenu->AppendMenu(MF_SEPARATOR); L>!8YUz7p$  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); T"p(]@Ng  
  } xy8#2  
 }  Og2vGzD  
 SetIcon(m_hIcon, TRUE); // Set big icon iJv48#'ii  
 SetIcon(m_hIcon, FALSE); // Set small icon c{>uqPTY  
 m_Key.SetCurSel(0); [3W*9j  
 RegisterHotkey(); &m {kHM  
 CMenu* pMenu=GetSystemMenu(FALSE); aZet0?Qr  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hKNY+S})g  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4g}FB+[u  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ="%W2  
 return TRUE; // return TRUE unless you set the focus to a control dl5=q\1=  
} \ A%eG&  
`e]6#iJ^  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !)qQbk  
{ (>=7ng^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) dI*'!wK  
 { ~gI{\iNF/  
  CAboutDlg dlgAbout; KtB!"yy#  
  dlgAbout.DoModal(); [U8$HQ+x  
 } 6*nAo8gl  
 else `_5GG3@Ff  
 { G ){g  
  CDialog::OnSysCommand(nID, lParam); 3L _I[T$s  
 } ~P-*}q2J  
} Sd))vS^g  
H]\Zn%.#  
void CCaptureDlg::OnPaint() _Mc>W0'5@  
{ Ch_xyuJ  
 if (IsIconic()) ]h!`IX  
 { >p])it[q&$  
  CPaintDC dc(this); // device context for painting +'#oz+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Ogg#jx(4  
  // Center icon in client rectangle }wwe}E-e  
  int cxIcon = GetSystemMetrics(SM_CXICON); 1%J.WH6eQ  
  int cyIcon = GetSystemMetrics(SM_CYICON); (QB+%2v  
  CRect rect; ogeL[7  
  GetClientRect(&rect); td{O}\s7D  
  int x = (rect.Width() - cxIcon + 1) / 2; k$Rnj`*^  
  int y = (rect.Height() - cyIcon + 1) / 2; _7kM]">j  
  // Draw the icon Q0_>'sEM  
  dc.DrawIcon(x, y, m_hIcon); 6+dn*_[Z6  
 } PoShQR<  
 else +VU4s$w6  
 { R^MiP|?ZH  
  CDialog::OnPaint(); H]31l~@]  
 } n&-496H  
} X6RQqen3:  
7ODaX.t->  
HCURSOR CCaptureDlg::OnQueryDragIcon() uH\kQ9f  
{ $R^AEa7  
 return (HCURSOR) m_hIcon; :Dl% _l  
} V+Xl9v4O  
C:\(~D *GS  
void CCaptureDlg::OnCancel() 0O2n/`'  
{ ?M6ag_h3  
 if(bTray) Az,- Cq  
  DeleteIcon(); 9 1P4:6  
  CDialog::OnCancel(); N<JHjq  
} PI|`vC|yy&  
r$nkU4N'  
void CCaptureDlg::OnAbout() ?\H.S9CZ^  
{ tSv0" L  
 CAboutDlg dlg; (U87}}/l  
 dlg.DoModal(); /N^~U&7  
} Pg^h,2h  
tfiqr|z  
void CCaptureDlg::OnBrowse() VRS 2cc  
{ "S(X[Y'  
 CString str; "dN < i  
 BROWSEINFO bi; @R:#"  
 char name[MAX_PATH]; V 2kWiyN  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 6 ,N6jaW  
 bi.hwndOwner=GetSafeHwnd(); aIvBY78o  
 bi.pszDisplayName=name; 3n(*E_n  
 bi.lpszTitle="Select folder"; DBbc|I/[l  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; T$b\Q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); PM~*|(fA  
 if(idl==NULL) hWGZd~L  
  return; &?a.mh/8[[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); rveVCTbC  
 str.ReleaseBuffer(); R40W'N 1%q  
 m_Path=str; Xt(! a  
 if(str.GetAt(str.GetLength()-1)!='\\') Hbr^vYs5  
  m_Path+="\\"; ;9rTE|n  
 UpdateData(FALSE);  *q"G }  
} B!q?_[k,  
N+>'J23d!  
void CCaptureDlg::SaveBmp() pv$tTWk  
{ &|z544  
 CDC dc; MTB@CP!u  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &,uC9$  
 CBitmap bm; wr@GN8e`  
 int Width=GetSystemMetrics(SM_CXSCREEN); !d4HN.a7+u  
 int Height=GetSystemMetrics(SM_CYSCREEN); |[wyc!nY).  
 bm.CreateCompatibleBitmap(&dc,Width,Height); $y6rvQ 2>S  
 CDC tdc; T <A   
 tdc.CreateCompatibleDC(&dc); {( HxG4~  
 CBitmap*pOld=tdc.SelectObject(&bm); j:?N!*r=  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); BD1K H;  
 tdc.SelectObject(pOld); 3Wj,}  
 BITMAP btm; M'|)dM|  
 bm.GetBitmap(&btm); XIN5a~[z*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ~|=rwDBZ8l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); CveWl$T12  
 BITMAPINFOHEADER bih; GEi MmH?  
 bih.biBitCount=btm.bmBitsPixel; 1,u{&%yL"w  
 bih.biClrImportant=0; 9L=;KtE1  
 bih.biClrUsed=0; z\h, SX<U  
 bih.biCompression=0; O2@" w23  
 bih.biHeight=btm.bmHeight; {3 SdX  
 bih.biPlanes=1; I3ho(Kdi  
 bih.biSize=sizeof(BITMAPINFOHEADER); ;Bnr=' [  
 bih.biSizeImage=size; US]"4=Zm  
 bih.biWidth=btm.bmWidth; o~}1 oN  
 bih.biXPelsPerMeter=0; 9C1b^^Kb  
 bih.biYPelsPerMeter=0; (l;C%O7*  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _3KZME  
 static int filecount=0; !SN WB  
 CString name; Z_jn27AC  
 name.Format("pict%04d.bmp",filecount++); V4oak!}?  
 name=m_Path+name; z-)*Q  
 BITMAPFILEHEADER bfh; Ku&*`dME  
 bfh.bfReserved1=bfh.bfReserved2=0; Z3I L8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); iZu:uMoc  
 bfh.bfSize=54+size; G#g{3}dcK  
 bfh.bfOffBits=54; -Cml0}.O   
 CFile bf; (-#rFO5~l  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ w1.MhA  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); :MdEr//w  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); eTT^KqE>&  
  bf.WriteHuge(lpData,size); ->Q`'@'|P  
  bf.Close(); s.bT[0Vl  
  nCount++; g!.Ut:8L9  
 } +0dQORo  
 GlobalFreePtr(lpData); `J]<_0kX}%  
 if(nCount==1) U"/yB8!W  
  m_Number.Format("%d picture captured.",nCount); QQSH +  
 else ;4R =eI  
  m_Number.Format("%d pictures captured.",nCount); n8 GF8a  
  UpdateData(FALSE); a$laRtId7  
} rS=tcB O  
rSzQUn<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) } =xI3;7  
{ 1Q0%7zRirI  
 if(pMsg -> message == WM_KEYDOWN) HgS<Vxmq  
 { nq),VPJi  
  if(pMsg -> wParam == VK_ESCAPE) 8Yo-~,Gb  
   return TRUE; K`,nW6\  
  if(pMsg -> wParam == VK_RETURN) ef^Cc)S-Q  
   return TRUE; y4 dp1<t%  
 } -??!@R7V  
 return CDialog::PreTranslateMessage(pMsg); 9$:QLE+t  
} HDa~7wE  
#: dR^zr<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `WP@ZSC6  
{ Zj:a-=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ NW }>pb9  
  SaveBmp(); 9"[!EKW  
  return FALSE; wBg<Q{J  
} `WraOsoY  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =W;t@"6>2  
 CMenu pop; 2Px$0&VN  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); oqm  
 CMenu*pMenu=pop.GetSubMenu(0); $'WapxF  
 pMenu->SetDefaultItem(ID_EXITICON); Jslk  
 CPoint pt; .vCY%0oE  
 GetCursorPos(&pt); Wg}B@:`T  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); j|3g(_v4W  
 if(id==ID_EXITICON) 7Qm;g-)f  
  DeleteIcon(); Y\+(rC27  
 else if(id==ID_EXIT) ?ZSXoy-kr  
  OnCancel(); vgUhN_rK  
 return FALSE; a7XXhsZ  
} z Y$X|= f  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); K> c8r8!  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *#9VC)Q  
 AddIcon(); Bf D,z  
 return res; Sb@{f<3E  
} {^PO3I  
S3j]{pZ(z  
void CCaptureDlg::AddIcon() ~rVKQ-+4&  
{ Oz4,Y+[#  
 NOTIFYICONDATA data; d,GtH)(s  
 data.cbSize=sizeof(NOTIFYICONDATA); { r< (t#  
 CString tip;  ;'2`M  
 tip.LoadString(IDS_ICONTIP); [4K9|/J  
 data.hIcon=GetIcon(0); k"Z"$V2i  
 data.hWnd=GetSafeHwnd(); [H6X2yjj|  
 strcpy(data.szTip,tip); 0?J|C6XM#4  
 data.uCallbackMessage=IDM_SHELL; 3/A!_Uc(  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; IGh !d?D  
 data.uID=98; fg>B  
 Shell_NotifyIcon(NIM_ADD,&data); }[=xe(4]D  
 ShowWindow(SW_HIDE); FqT,4SIR  
 bTray=TRUE; . Ce&9l  
} :_{{PY0PK  
B9m>H=8a  
void CCaptureDlg::DeleteIcon() SIaUrC  
{ ]Omb :  
 NOTIFYICONDATA data; d'Ik@D]I  
 data.cbSize=sizeof(NOTIFYICONDATA); 2yEO=SN,(  
 data.hWnd=GetSafeHwnd(); %v`-uAy:  
 data.uID=98; h a,=LV  
 Shell_NotifyIcon(NIM_DELETE,&data); 4."o.:8x  
 ShowWindow(SW_SHOW); EMVoTW)z  
 SetForegroundWindow(); |d B1R%  
 ShowWindow(SW_SHOWNORMAL); > hDsm;,/  
 bTray=FALSE; Oet#wp/I  
} dIBKE0`  
]]h:#A2  
void CCaptureDlg::OnChange() E&s'uE=w+  
{ 9rpg10/T  
 RegisterHotkey(); 'Ec:l(2Ec  
} #TW>'l F  
-A-hxK*^  
BOOL CCaptureDlg::RegisterHotkey() +s/N@]5nW  
{ {LB }v;?l  
 UpdateData(); ]@ Sc}  
 UCHAR mask=0; 90y9~.v  
 UCHAR key=0; bCE7hutl  
 if(m_bControl) #pDGaqeX  
  mask|=4; 8XH|T^5  
 if(m_bAlt) !CVBG *E^l  
  mask|=2; n ]6 0  
 if(m_bShift) }Pm(oR'KTJ  
  mask|=1; }`<>$2b  
  key=Key_Table[m_Key.GetCurSel()]; xM'S ;Sg  
 if(bRegistered){ Rvu3Qo+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); eF8 aB?&"  
  bRegistered=FALSE; <*r<+S   
 } o {Xw Li  
 cMask=mask; |W~V@n8"6  
 cKey=key; aaf_3UH.B  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )-6s7  
 return bRegistered; [oU+b(  
} _r?;lnWx@  
bE`*Uw4  
  四、小结 @aiLG wh  
[K)1!KK,L  
  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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