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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: #?{qlgv<p  
  u8YB)kG  
  一、实现方法 E6Q]A~  
-<qxO  
  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: :dP~.ZY7  
SY-ez 91  
#pragma data_seg("shareddata") i;o}o *=  
HHOOK hHook =NULL; //钩子句柄 $Y6I_U  
UINT nHookCount =0; //挂接的程序数目 {L@+(I  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5@P%iBA4(3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 \q~w<%9Dq  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0"EoC  
static int KeyCount =0; hv* >%p  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 QsiJ%O Q  
#pragma data_seg() Q>.BQ;q]  
^Q0&.hL@  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ?Jt$a;  
t5.`! 3EO  
  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-*NT8  
$<B +K  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1O |V=K  
cKey,UCHAR cMask) 5|ic3  
{ 8-7dokg>  
 BOOL bAdded=FALSE; RMoJz6 ^>  
 for(int index=0;index<MAX_KEY;index++){ y 'OlQ2U  
  if(hCallWnd[index]==0){ !;%y$$gxh  
   hCallWnd[index]=hWnd; /XcDYMKgh  
   HotKey[index]=cKey; dY}pN"  
   HotKeyMask[index]=cMask; zJ9v%.e  
   bAdded=TRUE; dUS  ZNY  
   KeyCount++; 4j> fI)FUW  
   break; lT]=&m>  
  } ;U Yc  
 } `} =yG_!A  
 return bAdded; XCDSmZ  
} 9tn;L"#&N  
//删除热键 /aZE,IeEz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6*u,c^a  
{ nH@(Y&S  
 BOOL bRemoved=FALSE; m0|K#^  
 for(int index=0;index<MAX_KEY;index++){ -hWC_X:9jP  
  if(hCallWnd[index]==hWnd){ Y\xUT>(J7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [C1 LT2a  
    hCallWnd[index]=NULL; bAf,aV/C&|  
    HotKey[index]=0; 7+}JgUh  
    HotKeyMask[index]=0; wtXY: O  
    bRemoved=TRUE; %Rp8{.t7  
    KeyCount--; AoYaVlKG8  
    break; IdPn%)>6  
   } "O*x' XhN  
  } |; $Bb866/  
 } fN-Gk(Ic  
 return bRemoved; c<wavvfUo  
} P;vxT}1  
-Ep!- a  
Z%}4bJ  
  DLL中的钩子函数如下: yGTziv!  
$r\"6e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <},1Ncl  
{ brh=NAzt  
 BOOL bProcessed=FALSE; u$%A#L[  
 if(HC_ACTION==nCode) B5ea(j  
 { w u)Wg-dT  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i9rS6<V'  
   switch(wParam) B8T\s)fxnX  
   {  +4et7  
    case VK_MENU: $&hN*7Ts  
     MaskBits&=~ALTBIT; p3c"ZPO~z  
     break; 8d!GZgC8R  
    case VK_CONTROL: Qzqc .T  
     MaskBits&=~CTRLBIT; a+`D'?z  
     break; BkawL,  
    case VK_SHIFT: 3JO]f5  
     MaskBits&=~SHIFTBIT; ~6`iY@)  
     break; *5k+t  
    default: //judge the key and send message FJeiY#us  
     break; gAt~?HvW6  
   } AF}gSNX  
   for(int index=0;index<MAX_KEY;index++){ s~^}F+n  
    if(hCallWnd[index]==NULL) x5}lgyt  
     continue; )I`if(fG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rn8cdM N  
    { k$N0lR4:p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 48O~Jx,  
     bProcessed=TRUE; h7]EB!D\A  
    } ? }yfKU`  
   } ~S*b  
  } yb2}_k.JG  
  else if((lParam&0xc000ffff)==1){ //有键按下 C&+6>L@  
   switch(wParam) Fv8f+)k)Z~  
   { @MiH(.Dq  
    case VK_MENU: }4&/VvN  
     MaskBits|=ALTBIT; nv0#~UgE#a  
     break; l30Y8t~d  
    case VK_CONTROL: !R'g59g  
     MaskBits|=CTRLBIT; UMU2^$\iS  
     break; +bA%  
    case VK_SHIFT: J0Z7 l  
     MaskBits|=SHIFTBIT; 3BdX  
     break; X^s2BW  
    default: //judge the key and send message a~PK pw2%  
     break; zF`3 gl.  
   } wM~H(=s`D  
   for(int index=0;index<MAX_KEY;index++){ k7@t{Cu0D&  
    if(hCallWnd[index]==NULL) 5'KA'>@  
     continue; DY\J[l<<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) iEm ?  
    { E{?au]y$J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /mA,F;   
     bProcessed=TRUE; u JY)4T  
    } nhT-Ido  
   } Qkcjr]#^$  
  } M}O}:1Par  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 r)^vO+3u  
   for(int index=0;index<MAX_KEY;index++){ v6GPS1:a  
    if(hCallWnd[index]==NULL) hI},~af  
     continue; ~q+hV+fa>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +s++7<C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S >yLqPp  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ea'&xs#GK  
   } H[ m <RaG8  
  } M|,mr~rRG  
 } `=UWqb(K_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @-HG`c ct  
} ]bZ(HC?KZr  
rHjq1-t  
  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: FAsFjRS  
rV6/Tdy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gw36Ec<M  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >w+HHs/$wK  
q_kdCO{:df  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: rG}\Zjn{  
k{;,6H  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8CbXMT  
{ H+E$:)gN  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) \C,p WW  
 { 6$\jAd|  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 _8,()t'"  
  SaveBmp(); {vEOn-(7  
  return FALSE; m_+sR!\H8  
 } XI<L;  
 …… //其它处理及默认处理 ag-f{UsTy  
} H@bf'guA|B  
c;?fMX  
f>`dF?^6  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 1y#D?R=E  
N@ \&1I`c$  
  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。 EU7|,>a  
V!v:]E  
  二、编程步骤 f| _u7"OX  
JN+_|`  
  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"; jhu07HX_  
kQ1w5mCh  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ^9Qy/Er'  
=X\^J  
  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; &>d:R_Q]  
ApBWuXp|u  
  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; F8-?dpf'  
R^?/' dr  
  5、 添加代码,编译运行程序。 2c6g>?  
#Cpd9|  
三、程序代码 ?;[w" `"  
wLc4Dm*V  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL W-NDBP:  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ym%xx!9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wE+${B03  
#if _MSC_VER > 1000 h8Yx#4  
#pragma once 7 d LuX   
#endif // _MSC_VER > 1000 #(An6itl  
#ifndef __AFXWIN_H__ IxLhU45  
#error include 'stdafx.h' before including this file for PCH q9Y9w(  
#endif .7K7h^*F  
#include "resource.h" // main symbols `]Q:-h  
class CHookApp : public CWinApp V"c 6Kdtd  
{ =[b)1FUp  
 public: RuII!}*  
  CHookApp();  (x/k.&  
  // Overrides X 1 57$  
  // ClassWizard generated virtual function overrides , ]bB9tid  
  //{{AFX_VIRTUAL(CHookApp) [!!Q,S"  
 public: rj(T~d4  
  virtual BOOL InitInstance(); ,eTU/Q>{,&  
  virtual int ExitInstance(); T5a*z}L5  
  //}}AFX_VIRTUAL (=7Cs  
  //{{AFX_MSG(CHookApp) KQB3 m"  
  // NOTE - the ClassWizard will add and remove member functions here. R(q~ -3~  
  // DO NOT EDIT what you see in these blocks of generated code ! yKO`rtP  
  //}}AFX_MSG +$g}4  
  DECLARE_MESSAGE_MAP() %CK^Si%+  
}; ``wSc0\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); s"t$0cH9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >=[(^l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'Lu__NfN  
BOOL InitHotkey(); '7XIhN9  
BOOL UnInit(); z`:lcF{V  
#endif 0`^&9nR  
|JQQU! x  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. FCnm1x#  
#include "stdafx.h" H1} RWaJ  
#include "hook.h" #O+),,WS  
#include <windowsx.h> Q%xC}||1s"  
#ifdef _DEBUG C=eF.FB;'  
#define new DEBUG_NEW yu;P +G  
#undef THIS_FILE ?Y@N`S  
static char THIS_FILE[] = __FILE__; dq]0X?[6  
#endif zux{S; :?  
#define MAX_KEY 100 iyg*Xbmi~.  
#define CTRLBIT 0x04 %}%Qc6.H  
#define ALTBIT 0x02 D8$G`~hD  
#define SHIFTBIT 0x01 @nux9MX<9  
#pragma data_seg("shareddata") v%q0OX>9X"  
HHOOK hHook =NULL; .ev?"!Vpp9  
UINT nHookCount =0; _H5o'>=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey J:Qa5MTWp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Z'\h  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 8P|D13- Q  
static int KeyCount =0; 2AMo:Jqv  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift u:=7l  
#pragma data_seg() g*_cP U0~m  
HINSTANCE hins; VIv&ofyAR  
void VerifyWindow(); 0N $v"uX@  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 9b9$GyI  
//{{AFX_MSG_MAP(CHookApp) NuQdSj_>  
// NOTE - the ClassWizard will add and remove mapping macros here. zzX_q(:S  
// DO NOT EDIT what you see in these blocks of generated code! b45-:mi!&#  
//}}AFX_MSG_MAP O6LS(5j2  
END_MESSAGE_MAP() "hsb8-  
<i&_ooX  
CHookApp::CHookApp() ]"?)Z  
{ sVOyT*GY  
 // TODO: add construction code here, PK`D8)=u  
 // Place all significant initialization in InitInstance t+!$[K0/  
} hpD!2 K3>  
^zQ/mo,Z  
CHookApp theApp; `Tv[DIVW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a6uJYhS~  
{ |>dI/_'  
 BOOL bProcessed=FALSE; =w{Z@S(ukz  
 if(HC_ACTION==nCode) ?`PvL!'  
 { lE4HM$p   
  if((lParam&0xc0000000)==0xc0000000){// Key up $w`=z<2yo1  
   switch(wParam) =`H@%  
   { 'F9jq  
    case VK_MENU: OG>}M$ Ora  
     MaskBits&=~ALTBIT; ,,q10iF  
     break; toBHkiuD  
    case VK_CONTROL:  &7K?w~  
     MaskBits&=~CTRLBIT; cWe"%I  
     break; 7_inJ$  
    case VK_SHIFT: v@ lM3_rbO  
     MaskBits&=~SHIFTBIT; *^VRGfpb  
     break; VgZsB$Ori  
    default: //judge the key and send message U_I5fK =  
     break; H _zo1AW  
   } D=-SO +  
   for(int index=0;index<MAX_KEY;index++){ X:nN0p #  
    if(hCallWnd[index]==NULL) K3#@SY j  
     continue; 8|l\E VV6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L?mrba y  
    { n<z [J=I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %D\[*  
     bProcessed=TRUE; 3 :<WY&9  
    } l*d(;AR  
   } :LW4E9O=H  
  } GLeK'0Q@  
  else if((lParam&0xc000ffff)==1){ //Key down f Sa"%8%  
   switch(wParam) "hH.#5j  
   { l~w2B>i)  
    case VK_MENU: 3sy (vC  
     MaskBits|=ALTBIT; ;;6uw\6 O  
     break; !Fd~~v  
    case VK_CONTROL: a%/9v"}  
     MaskBits|=CTRLBIT; s@K4u^$A  
     break; .$+#1-  
    case VK_SHIFT: 2fn&#kw/  
     MaskBits|=SHIFTBIT; R6;=n"Ueb  
     break; K8GP@yD]M  
    default: //judge the key and send message o$jLzE"  
     break; W{6|tx)  
   } Y 5- F@(  
   for(int index=0;index<MAX_KEY;index++) \/zq7j  
   { YIQ 4t  
    if(hCallWnd[index]==NULL) N"Zt47(  
     continue; @#T|Y&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $_"'&zQ'  
    { 7q?, ?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); FKDk+ojw  
     bProcessed=TRUE; FWrX3i  
    } SB H(y)  
   } f!Y?S  
  } 5YE'L.  
  if(!bProcessed){ Jh,]r?Bd  
   for(int index=0;index<MAX_KEY;index++){ R3gdLa.  
    if(hCallWnd[index]==NULL) Ezc?#<+7  
     continue; e>+i>/Fn{h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) qr"3y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); x[ ~b2o  
   } Lt?lv2k=L  
  } gmw|H?]  
 } cQCSe,$ W  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); G|!Tj X7s  
} |"ls\ 7  
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BOOL InitHotkey() %Nlt H/I  
{ M?Y;a5{  
 if(hHook!=NULL){ ,8U &?8l  
  nHookCount++; ;K:zmH  
  return TRUE; bzBEX mC  
 } 4&<oFW\r  
 else i [7\[  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ^}/PGG\~r  
  if(hHook!=NULL) le|~BG hL  
   nHookCount++; <\r T%f}3^  
  return (hHook!=NULL); UZ\u;/}  
} 4":KoS`,j  
BOOL UnInit() K[YI4pt7  
{ kCWV r  
 if(nHookCount>1){ YxYH2*q@  
  nHookCount--; y-'$(x  
  return TRUE; :~"CuB/  
 } :~&~y-14  
 BOOL unhooked = UnhookWindowsHookEx(hHook); FH?U(-  
 if(unhooked==TRUE){  VA6}  
  nHookCount=0; at#ja_ hd  
  hHook=NULL; ?~BC#B\>o  
 } BKCA <  
 return unhooked; I0D(F i  
}  eI$oLl@  
L iN$ pwm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2V mNZ{<  
{ LO9=xGj.  
 BOOL bAdded=FALSE; JU1~e@/'%  
 for(int index=0;index<MAX_KEY;index++){ Z]>O+  
  if(hCallWnd[index]==0){ |mxDjgq  
   hCallWnd[index]=hWnd; !JHL\M>A5  
   HotKey[index]=cKey; XKj|f`  
   HotKeyMask[index]=cMask; ]#)()6)2v  
   bAdded=TRUE; ?PuBa`zDE  
   KeyCount++; '}ptj@,  
   break; \=VtHu92=  
  } :C(=&g<]D  
 } ^me-[ 5  
 return bAdded; S'Q@ScJ  
} SD"FErJ  
Yg]-wQrH  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M8kPj8}{  
{ ` 06;   
 BOOL bRemoved=FALSE; jl4rbzse  
 for(int index=0;index<MAX_KEY;index++){ K -nF lPm\  
  if(hCallWnd[index]==hWnd){ ~ (|5/ p7t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !E<[JM  
    hCallWnd[index]=NULL; (5$!MUS~9  
    HotKey[index]=0; EU2$f  
    HotKeyMask[index]=0; |7'df&CA  
    bRemoved=TRUE; *v;2PP[^  
    KeyCount--; -u6bAQ  
    break; \ :%(q/v"X  
   } 9&-dTayIz  
  } Sq>dt[7  
 } DrKP%BnS  
 return bRemoved; "%`1 ]Fr  
} dU&a{ $ku[  
<Th6r.#?  
void VerifyWindow() yZ0-wI  
{ g!g#]9j  
 for(int i=0;i<MAX_KEY;i++){ jD$,.AVvz  
  if(hCallWnd!=NULL){ }*M6x;t  
   if(!IsWindow(hCallWnd)){ e>} s;H,  
    hCallWnd=NULL; j+i\bks  
    HotKey=0; G,&<<2{(f;  
    HotKeyMask=0; 7-bd9uVK  
    KeyCount--; F&!6jv  
   } zJq~!#pZ  
  } j8v8uZ;x  
 } >8~.wXyoC  
} !a{^=#qq&I  
z Xg3[orF  
BOOL CHookApp::InitInstance() xT3BHnQ(  
{ k :(SCHf  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ISYXH9V  
 hins=AfxGetInstanceHandle(); (ZS}G8  
 InitHotkey(); ]FJjgu<  
 return CWinApp::InitInstance(); 2,DXc30I  
} lp.ldajN  
x>**;#7)  
int CHookApp::ExitInstance() SL Ws*aq  
{ ak7bJ~)X=  
 VerifyWindow(); qk%;on&`  
 UnInit(); ih58 <Up5  
 return CWinApp::ExitInstance(); 66g9l9wm(  
} S5gyr&dm  
Y z<3JRw  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file u0JB\)(-/h  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) UFXaEl}R   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ B{QBzx1L9c  
#if _MSC_VER > 1000 T;Lkaxsn  
#pragma once w#ZoZZ wh  
#endif // _MSC_VER > 1000 H9'$C/w  
&W| [r(  
class CCaptureDlg : public CDialog I,E?h?6Y  
{ *D'22TO[[!  
 // Construction G!Op~p@Jm  
 public: cVXLKO  
  BOOL bTray; 0eT(J7[ <  
  BOOL bRegistered; LoURC$lS  
  BOOL RegisterHotkey(); UE8kpa)cQ  
  UCHAR cKey; 3U<cWl@  
  UCHAR cMask; e),q0%5  
  void DeleteIcon(); ahJ`T*)HY  
  void AddIcon(); J9\Cm!H  
  UINT nCount; dH;8mb|#'  
  void SaveBmp(); ~uj#4>3T  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor $iN"9N%l  
  // Dialog Data ]Z>}6!  
  //{{AFX_DATA(CCaptureDlg) ;@mS^ik")$  
  enum { IDD = IDD_CAPTURE_DIALOG }; /MIe(,>Uh  
  CComboBox m_Key; QJZK|*  
  BOOL m_bControl; qLO4#CKCL6  
  BOOL m_bAlt; +jAGGv^)  
  BOOL m_bShift; 5VfyU8)7X  
  CString m_Path; +KF^Z$I  
  CString m_Number; Q7HRzA^-  
  //}}AFX_DATA Sgeh %f  
  // ClassWizard generated virtual function overrides i[O& )N,c  
  //{{AFX_VIRTUAL(CCaptureDlg) `fA@hK   
 public: ^7 w+l @  
  virtual BOOL PreTranslateMessage(MSG* pMsg); `{f}3bO7C  
 protected: zG }@0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qz"}g/;?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); xipU8'ac/  
  //}}AFX_VIRTUAL Jz\%%C  
  // Implementation '*Z1tDFS  
 protected: `XJG(Oas\  
  HICON m_hIcon; *^\Ef4Lh  
  // Generated message map functions -z ID x  
  //{{AFX_MSG(CCaptureDlg) A` N,  
  virtual BOOL OnInitDialog(); TEP,Dq  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); TtJH7  
  afx_msg void OnPaint(); 9)h"-H;5:  
  afx_msg HCURSOR OnQueryDragIcon(); nXaC 3W:"  
  virtual void OnCancel(); +vw\y  
  afx_msg void OnAbout(); \S"isz  
  afx_msg void OnBrowse(); .r|tSfm6  
  afx_msg void OnChange(); &pP;Neh;  
 //}}AFX_MSG 034iK[ib"  
 DECLARE_MESSAGE_MAP() WQx?[tW(U  
}; TtK[nP  
#endif )Oq|amvC  
7LfAaj  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;@0;pY  
#include "stdafx.h" `Syl:rU~y@  
#include "Capture.h" Mc? Qx  
#include "CaptureDlg.h" .O DU  
#include <windowsx.h> y;4OY  
#pragma comment(lib,"hook.lib") 1NbG>E#Ol  
#ifdef _DEBUG R6 y#S&]x  
#define new DEBUG_NEW ^+*N%yr  
#undef THIS_FILE )1Y{Q Y}l  
static char THIS_FILE[] = __FILE__; X@--m6-  
#endif ^3G{|JB!+  
#define IDM_SHELL WM_USER+1 kYM~d07 V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |O{m2Fi  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 272q1~&  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; F6LH $C  
class CAboutDlg : public CDialog -zCH**y%1  
{ MOQ6 :  
 public: |-b#9JQ[A  
  CAboutDlg(); 4`lLf  
  // Dialog Data [xbSYu,&  
  //{{AFX_DATA(CAboutDlg) {yBs7[Wn  
  enum { IDD = IDD_ABOUTBOX }; 1m'k|Ka  
  //}}AFX_DATA ,[N%Q#  
  // ClassWizard generated virtual function overrides kC:uG0sW  
  //{{AFX_VIRTUAL(CAboutDlg) nB_?ckj,  
 protected: C>]0YO k2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xI{)6t$`  
  //}}AFX_VIRTUAL *zaQx+L  
  // Implementation p99 ]  
 protected: <3oWEm  
  //{{AFX_MSG(CAboutDlg) I~[F|d>  
  //}}AFX_MSG el&0}`K  
  DECLARE_MESSAGE_MAP() {IjF+@I  
};  Z< 1  
rbul8(1h  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Z@yW bjE7Z  
{ 3>3Kwc~E  
 //{{AFX_DATA_INIT(CAboutDlg) D+#E -8  
 //}}AFX_DATA_INIT *-#&K\  
} Ij 79~pn  
rExnxQ<e  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #?RU;1)Cw  
{ 2\R'@L*  
 CDialog::DoDataExchange(pDX); _1!7V3|^  
 //{{AFX_DATA_MAP(CAboutDlg) xn?a. 3b'  
 //}}AFX_DATA_MAP m1j*mtu  
} QpF;:YX^3  
vXev$x=w-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DMs,y{v  
 //{{AFX_MSG_MAP(CAboutDlg) b k~( ^!R  
 // No message handlers O 5!7'RZ  
 //}}AFX_MSG_MAP _;W.q7 b]  
END_MESSAGE_MAP() {k(g]#pP  
hMa]B*o/-  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) y>S.?H:P  
: CDialog(CCaptureDlg::IDD, pParent) W}nlRbN?  
{  50"pbzW  
 //{{AFX_DATA_INIT(CCaptureDlg) dSLU>E3g  
  m_bControl = FALSE; ;Y)w@bNt@  
  m_bAlt = FALSE; bAdn &   
  m_bShift = FALSE; ov|d^)'  
  m_Path = _T("c:\\"); bes<qy  
  m_Number = _T("0 picture captured."); 4M^= nae  
  nCount=0; oxr#7Ei0d  
  bRegistered=FALSE; yyR0]NzYUD  
  bTray=FALSE; pk>^?MO  
 //}}AFX_DATA_INIT IWk4&yHUAu  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Lk|hQ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !zBhbmlKt  
} \h+AXs<j  
*$#W]bO  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <g-9T-Ky  
{ []D&bYpv  
 CDialog::DoDataExchange(pDX); ] ;KJ6  
 //{{AFX_DATA_MAP(CCaptureDlg) G3C~x.(f  
  DDX_Control(pDX, IDC_KEY, m_Key); -6Z\qxKqZ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;:iY)}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 1eA7>$w}[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \c,ap49RC  
  DDX_Text(pDX, IDC_PATH, m_Path); 6 o^,@~:R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Cwr~HY  
 //}}AFX_DATA_MAP .b_)%jd x  
} I) rCd/  
W'els)WJ|x  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 84$nT>c  
//{{AFX_MSG_MAP(CCaptureDlg) Mc@e0  
 ON_WM_SYSCOMMAND()  vx\r!]  
 ON_WM_PAINT() ) g0%{dfJ  
 ON_WM_QUERYDRAGICON() oVnvO iAc  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) )S3\,S-.  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ycc4W*]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #:jHp44J  
//}}AFX_MSG_MAP "/yC@VC>  
END_MESSAGE_MAP() Q_1:tW &  
<5d ~P/,  
BOOL CCaptureDlg::OnInitDialog() :8I9\eet3  
{ ?U%QG5/>  
 CDialog::OnInitDialog(); ,NOsFO-`<  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Hfv7LM  
 ASSERT(IDM_ABOUTBOX < 0xF000); Ac96 [  
 CMenu* pSysMenu = GetSystemMenu(FALSE); '>NCMB{*  
 if (pSysMenu != NULL) AmvEf  
 { iMAfJ-oN  
  CString strAboutMenu; H  >j  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,ly\Ka?zO  
  if (!strAboutMenu.IsEmpty()) vhe>)h*B  
  { XywE1}3  
   pSysMenu->AppendMenu(MF_SEPARATOR); k@\ iGqo  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); hmvfw:Nq4  
  } 5rwu!Y;7*  
 } E8!e:l =Q  
 SetIcon(m_hIcon, TRUE); // Set big icon aL*&r~`&e'  
 SetIcon(m_hIcon, FALSE); // Set small icon I+BHstF5um  
 m_Key.SetCurSel(0); f}aL-N~  
 RegisterHotkey(); Z"Zmo>cV4  
 CMenu* pMenu=GetSystemMenu(FALSE); ;}7Rjl#  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =w;F<M|Y  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,f<?;z  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FI[A[*fi  
 return TRUE; // return TRUE unless you set the focus to a control 6TYY UM"&  
} +?F[/?s5qz  
3?[dE<  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Jy^u?  
{ 00'%EYO  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _|iSF2f,X  
 { MPCBT!o4Z  
  CAboutDlg dlgAbout; RdWRWxTn8+  
  dlgAbout.DoModal(); <_h~w}  
 } O#b6mKPt;t  
 else rEv@Y D  
 { 'GB. UKlR  
  CDialog::OnSysCommand(nID, lParam); 7_%"BVb"  
 } h xSKG  
} FO=4:   
uH/J]zKR  
void CCaptureDlg::OnPaint() 6tB+JF  
{ T3~k>"W  
 if (IsIconic()) Z LB4m`  
 { 4P'*umJi  
  CPaintDC dc(this); // device context for painting ?: N @!jeJ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ahuGq'  
  // Center icon in client rectangle |s'Po^Sy  
  int cxIcon = GetSystemMetrics(SM_CXICON); .>CPRVuVI  
  int cyIcon = GetSystemMetrics(SM_CYICON); X59: C3c  
  CRect rect; Z9:-rcr  
  GetClientRect(&rect); }&/o'w2wY  
  int x = (rect.Width() - cxIcon + 1) / 2; ? K ;dp  
  int y = (rect.Height() - cyIcon + 1) / 2; V`X2> -Ex  
  // Draw the icon |*:'TKzNS  
  dc.DrawIcon(x, y, m_hIcon); ,#Iu 7di  
 } .JYaH?  
 else  ;hY S6  
 { $8;R[SU6Y  
  CDialog::OnPaint(); [ad@*KFxy3  
 } Z8zmHc"IH  
} O]lSWEe  
q ]M+/sl  
HCURSOR CCaptureDlg::OnQueryDragIcon() @HQ`~C#Z'  
{ 9bP^`\K[N  
 return (HCURSOR) m_hIcon; :axRoRg  
} a&tSj35*6  
+,2:g}5  
void CCaptureDlg::OnCancel() 9  TvV=  
{ #OIcLEn%  
 if(bTray) [baiH|5>  
  DeleteIcon(); y&Mr=5:y  
  CDialog::OnCancel(); =x!2Ak/)  
} 6qRx0"qB  
Ey_" ~OB  
void CCaptureDlg::OnAbout() .Si,dc\  
{ \Z]UA&v_  
 CAboutDlg dlg; TatpXN\  
 dlg.DoModal(); L$9 . 8W  
} ]DOX?qI i  
8)O[Aq::  
void CCaptureDlg::OnBrowse() 3 DDML,  
{ 3^R&:|,  
 CString str; :A1{d?B  
 BROWSEINFO bi; \Kl+ 5%L  
 char name[MAX_PATH]; X*&[u7No  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )=5ng-  
 bi.hwndOwner=GetSafeHwnd(); LO <  
 bi.pszDisplayName=name; K<pV  
 bi.lpszTitle="Select folder"; Fz1_w$^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; VTG9$rQZ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); "]z-: \ V  
 if(idl==NULL) Q7R~{5r>W  
  return; zN!ZyI$nqP  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .#1~Rz1r  
 str.ReleaseBuffer(); KMU4n-s"o  
 m_Path=str; oX0D  
 if(str.GetAt(str.GetLength()-1)!='\\') 0(mkeIzJt/  
  m_Path+="\\"; E0u~i59Z  
 UpdateData(FALSE); w S4.8iJ  
} R(2tlZ  
L%Ow#.[C2  
void CCaptureDlg::SaveBmp() VCn{mp*h  
{ u#Z#)3P  
 CDC dc; --HF8_8;'  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >Y #t`6,!  
 CBitmap bm; rypTKT|U;  
 int Width=GetSystemMetrics(SM_CXSCREEN); >)spqu]  
 int Height=GetSystemMetrics(SM_CYSCREEN); v1%uxthW  
 bm.CreateCompatibleBitmap(&dc,Width,Height); lD"(MQV@0  
 CDC tdc; r.#t63Rb  
 tdc.CreateCompatibleDC(&dc); sB^<6W!`(  
 CBitmap*pOld=tdc.SelectObject(&bm); q>mE< (-M  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *Txl+zTY  
 tdc.SelectObject(pOld); gA:5M  
 BITMAP btm; t: #6sF  
 bm.GetBitmap(&btm); HuwU0:*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; O)ME"@r@:  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); JcbwDlUb  
 BITMAPINFOHEADER bih; o'W5|Gy  
 bih.biBitCount=btm.bmBitsPixel; qW!]co  
 bih.biClrImportant=0; ZCB_  
 bih.biClrUsed=0; 4g : >[q  
 bih.biCompression=0; 6ek;8dL  
 bih.biHeight=btm.bmHeight; xER\ZpA :,  
 bih.biPlanes=1; 6`]$qSTS  
 bih.biSize=sizeof(BITMAPINFOHEADER); i?fOK_d  
 bih.biSizeImage=size; #a`a$A  
 bih.biWidth=btm.bmWidth; A j2OkD  
 bih.biXPelsPerMeter=0; 'Y56+P\u  
 bih.biYPelsPerMeter=0; UEozAY  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); o(S{VGi,  
 static int filecount=0; =!`j7#:  
 CString name; ``OD.aY^s  
 name.Format("pict%04d.bmp",filecount++); 2I&o69x?  
 name=m_Path+name; b@S Cn9  
 BITMAPFILEHEADER bfh; +"8,Mh  
 bfh.bfReserved1=bfh.bfReserved2=0; ")V130<  
 bfh.bfType=((WORD)('M'<< 8)|'B'); iVd.f A  
 bfh.bfSize=54+size; tI7:5Cm  
 bfh.bfOffBits=54; (;q\}u  
 CFile bf; m < 3Ao^I+  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :'*DPB-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e 46/{4F,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #Sa27$&.>  
  bf.WriteHuge(lpData,size); r=6v`)Qr  
  bf.Close(); 2n `S5(V  
  nCount++; VY)9|JJCO  
 } h=(DX5:A  
 GlobalFreePtr(lpData); lWqrU1Sjl  
 if(nCount==1) BRk0CLr5  
  m_Number.Format("%d picture captured.",nCount); R1& [S/  
 else t`+'r}=d  
  m_Number.Format("%d pictures captured.",nCount); `&-Mi[1  
  UpdateData(FALSE); [+OnV&  
} 6%fKuMpK(  
C&6IU8l\  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  +QE^\a  
{ 1}tbH[  
 if(pMsg -> message == WM_KEYDOWN) Q4*fc^?u  
 { MW PvR|Q  
  if(pMsg -> wParam == VK_ESCAPE) hs?sGr  
   return TRUE; (sQr X{~  
  if(pMsg -> wParam == VK_RETURN) ak:ibV  
   return TRUE; .VkbYK  
 } ?gwUwOV"  
 return CDialog::PreTranslateMessage(pMsg); Y}[c^$S  
} #?XQ7Im  
KX}Rr7a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2e|N@j &  
{ V=lfl1Ev0J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Y;)dct  
  SaveBmp(); #rY sj-2  
  return FALSE; Rcawc Y  
} $DZHQH  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ cetvQAGXY  
 CMenu pop; yB3;  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); MSV2ip3  
 CMenu*pMenu=pop.GetSubMenu(0); TARXx>  
 pMenu->SetDefaultItem(ID_EXITICON); AQc,>{Lm  
 CPoint pt; Y2O"]phi@  
 GetCursorPos(&pt); ;A'":vXmc  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); lw :`M2P,  
 if(id==ID_EXITICON) [2dn\z28  
  DeleteIcon(); 0v]?6wX  
 else if(id==ID_EXIT) -_<}$9lz  
  OnCancel();  ru`U'  
 return FALSE; _$p$")  
} (D 9Su^:1  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,&d@O>$E:  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) P1zdK0TM  
 AddIcon(); 2QNNp:`6  
 return res; [j"9rO" +  
} 7y`}PMn  
.)+h H y  
void CCaptureDlg::AddIcon() fi+R2p~vs  
{ fl;s9:<  
 NOTIFYICONDATA data; (o J9k[(  
 data.cbSize=sizeof(NOTIFYICONDATA); $46{<4.  
 CString tip; zh $}~RG[  
 tip.LoadString(IDS_ICONTIP); :d8W +|1u  
 data.hIcon=GetIcon(0); o0ZM[0@j  
 data.hWnd=GetSafeHwnd(); = 0- $W5E  
 strcpy(data.szTip,tip); unJ R=~E  
 data.uCallbackMessage=IDM_SHELL; UYA_jpIP  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1.D-FPK  
 data.uID=98; 4G@nZn  
 Shell_NotifyIcon(NIM_ADD,&data); c!hwmy;  
 ShowWindow(SW_HIDE); |e a~'N1  
 bTray=TRUE; HK)cKzG[s!  
} P"lBB8\eku  
" v}pdUW  
void CCaptureDlg::DeleteIcon() @R m-CWa  
{ `p'Q7m2y/b  
 NOTIFYICONDATA data; efG6v  
 data.cbSize=sizeof(NOTIFYICONDATA); \ j.x0/;  
 data.hWnd=GetSafeHwnd(); <} jPXEB"  
 data.uID=98; _al|'obomy  
 Shell_NotifyIcon(NIM_DELETE,&data); l/y]nw  
 ShowWindow(SW_SHOW); CU:o*;jP  
 SetForegroundWindow(); @FN*TJ  
 ShowWindow(SW_SHOWNORMAL); |xoF49  
 bTray=FALSE; hSGb-$~F  
} ]l~V&#i_c  
O9(r{Vu7u  
void CCaptureDlg::OnChange() f&4,?E;6%  
{ O|cu.u|  
 RegisterHotkey(); U Q@7n1  
} )U:2z-X&e  
nH !3(X*  
BOOL CCaptureDlg::RegisterHotkey() B`$L'  
{ fWGOP~0  
 UpdateData(); sP'0Sl~NU  
 UCHAR mask=0; !5}l&7:(MN  
 UCHAR key=0; 6O2=Ns;J6  
 if(m_bControl) `A/j1UWJ  
  mask|=4; r' BAT3  
 if(m_bAlt) +~nzii3  
  mask|=2; 4*Z6}"  
 if(m_bShift) ?R Fg$Z'^  
  mask|=1; K3GSOD>  
  key=Key_Table[m_Key.GetCurSel()]; w(nHD*nm  
 if(bRegistered){ 4y}"Hy  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); p3^jGj@  
  bRegistered=FALSE; E{Pgf8  
 } mT*{-n_Zs  
 cMask=mask; ']o od!  
 cKey=key; % 0:p)Z0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); r!N]$lB  
 return bRegistered; ]r]k-GZ$  
} tZWrz e^  
-qV{WZHp  
  四、小结 %1McD{  
> ^[z3T  
  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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