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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: ^'[Rb!Q8  
  Ma wio5  
  一、实现方法 C{+~x@  
|jc87(x <  
  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: AVHn7olG  
Kkdd}j  
#pragma data_seg("shareddata") 8h-6;x^^  
HHOOK hHook =NULL; //钩子句柄 BDc*N]m}B1  
UINT nHookCount =0; //挂接的程序数目 u'LA%l-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Pp #!yMxBr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 CEZ*a 0}=  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey aRg- rz  
static int KeyCount =0; aY8>#t?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 !!dNp5h`  
#pragma data_seg() }_XKO\  
S yX>zN!  
  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。 'szkn0  
\)`\F$CF  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: L}x"U9'C  
=<R77rnY&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR V=.lpj9m  
cKey,UCHAR cMask) aCy2 .Qn  
{ =as]>?<  
 BOOL bAdded=FALSE; rVFAwbR  
 for(int index=0;index<MAX_KEY;index++){ N!r@M."  
  if(hCallWnd[index]==0){ p}O@ %*p .  
   hCallWnd[index]=hWnd; sR'rY[^/|  
   HotKey[index]=cKey; /?HRq ?n  
   HotKeyMask[index]=cMask; lvcX}{>\  
   bAdded=TRUE; Y#NlbKkzu  
   KeyCount++; Y!CZ?c) @  
   break; )vhHlZ *+  
  } ?OlYJ/!z3  
 } LYv+Sv  
 return bAdded; ^]AjcctGr  
} u!X[xe;  
//删除热键 ]%F3 xzOk  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |OuZaCJG  
{ GP[;+xMBh  
 BOOL bRemoved=FALSE; Kl\A&O*{  
 for(int index=0;index<MAX_KEY;index++){ ub./U@ 1  
  if(hCallWnd[index]==hWnd){ cM.q^{d`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K|E}Ni  
    hCallWnd[index]=NULL; [Gysx  
    HotKey[index]=0; `N ;!=7y7Y  
    HotKeyMask[index]=0; Cm(Hu  
    bRemoved=TRUE; y! 7;Z~"  
    KeyCount--; a'XCT@B  
    break; P[aB}<1f0  
   } =`Nnd@3v  
  } Fl^.J<Dz  
 } !Kd/ lDY  
 return bRemoved; *+lnAxRa?  
} `L7 cS  
l,-smK69  
enK4`+.7  
  DLL中的钩子函数如下: pA"pt~6  
rh/3N8[6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) XNd:x {  
{ %nVnK6[sox  
 BOOL bProcessed=FALSE; H\ 8.T:>  
 if(HC_ACTION==nCode) 4- N>#  
 { I)O%D3wfMW  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 )"=BbMfhu  
   switch(wParam) r]" >  
   {  (a@cK,  
    case VK_MENU: b{(!Ls_ &  
     MaskBits&=~ALTBIT; WcbJ4Ore  
     break; qS+'#Sn  
    case VK_CONTROL: SQWA{f  
     MaskBits&=~CTRLBIT; :.DCRs$Q  
     break; Cf2rRH  
    case VK_SHIFT: Y -7x**I  
     MaskBits&=~SHIFTBIT; Dbz\8gmY  
     break; o!wz:|\S  
    default: //judge the key and send message SL>>]A,E<`  
     break; 64o`7  
   } Td X6<fVV  
   for(int index=0;index<MAX_KEY;index++){ >LwAG:Ud  
    if(hCallWnd[index]==NULL) -P@o>#Em  
     continue; Et# }XVCJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |`E\$|\p  
    { )u'oI_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .ikFqZ$$  
     bProcessed=TRUE; pi3Z)YcT  
    }  w~&bpCB!  
   } Kx ?}%@b  
  } x !]ZVl]  
  else if((lParam&0xc000ffff)==1){ //有键按下 hRtnO|Z6  
   switch(wParam) L'z;*N3D  
   { 6EP5n  
    case VK_MENU: qA Jgz7=c  
     MaskBits|=ALTBIT; =DG aK0n  
     break; ]'DtuT?Z  
    case VK_CONTROL: 6aXsRhQ~  
     MaskBits|=CTRLBIT; =HYMX "s  
     break; d\'M ~VQ  
    case VK_SHIFT: rS{Rzs^@  
     MaskBits|=SHIFTBIT; nRb#M  
     break; 6pxj9@X+  
    default: //judge the key and send message S!up2OseW  
     break; `"Tx%>E(U  
   } 3,S5>~R=  
   for(int index=0;index<MAX_KEY;index++){ `{ou4H\  
    if(hCallWnd[index]==NULL)  oC >^V5  
     continue; #oJ9BgDry  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) akrEZ7A  
    { N;;!ObVHnP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Z!^iPB0~D  
     bProcessed=TRUE; d+[hB4!l2  
    } YmNBtGhT  
   } J[RQF54qA{  
  } O9:vPbn  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 F~)xZN3=  
   for(int index=0;index<MAX_KEY;index++){ qf(!3  
    if(hCallWnd[index]==NULL) G{YJ(6etZ  
     continue; %l5Uy??Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A!W(>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^h4Q2Mv o  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *.ZV.(  
   } 8.'%wOU @A  
  } )7*Apy==x  
 } f)?s.DvUB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); po\QMe  
} cQS}pQyYN  
 UTHGjE  
  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: V)_mo/D!D  
*~:4&$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {*yhiE,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &HT P eB  
|JnJ=@-y  
  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: 6 @'v6 1'  
vAHJP$x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =Q[ 5U9  
{ Go+f0aig  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) e nDjP  
 { | t3_E  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 "&77`R  
  SaveBmp(); US@ak4Y6Z  
  return FALSE; p`T7Y\\#!  
 } haqL DVrf  
 …… //其它处理及默认处理 cuW$%$ F  
} $*`fn{2  
`?2S4lN/  
W 29@`93  
  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。 ;_1D-Mf  
:&9#p% /  
  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。 N=)N   
maXQG&.F  
  二、编程步骤 Q<wrO  
=uMoX -  
  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"; ;~tKNytD`B  
dHg[0Br)r  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; f*p=]]y  
<Mxy&9}ic  
  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; `:R8~>p  
 gX.4I;  
  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; }Q/xBC)  
JY4 +MApN  
  5、 添加代码,编译运行程序。 QEm6#y  
Z_ak4C  
三、程序代码 #e{l:!uS\  
bCy.S.`jHQ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL F3;UH%L1  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) : v<|y F  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 3{]csZvW  
#if _MSC_VER > 1000 cRI&cN"o  
#pragma once tb"UGa  
#endif // _MSC_VER > 1000 v`*!Bhc-  
#ifndef __AFXWIN_H__ u01x}Ff~6  
#error include 'stdafx.h' before including this file for PCH tg7%@SI5^-  
#endif HT[<~c  
#include "resource.h" // main symbols :>\i  
class CHookApp : public CWinApp m';:):  
{ @'7'3+ c  
 public: ,4)zn6tC  
  CHookApp(); }3V Q*'X>i  
  // Overrides _@ev(B  
  // ClassWizard generated virtual function overrides n B`pfg  
  //{{AFX_VIRTUAL(CHookApp) n]r7} 2hM  
 public: roVGS{4T\  
  virtual BOOL InitInstance(); B24wn8<  
  virtual int ExitInstance(); |36d<b Io  
  //}}AFX_VIRTUAL >E^sZmY[f-  
  //{{AFX_MSG(CHookApp) ri.;&  
  // NOTE - the ClassWizard will add and remove member functions here. Oz-X}eM  
  // DO NOT EDIT what you see in these blocks of generated code ! jLM1 ~`&  
  //}}AFX_MSG Dc}-wnga  
  DECLARE_MESSAGE_MAP() q~ T*R<S  
}; !Hr~B.f7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); nulVQOj|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '[I?G6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 69p>?zn  
BOOL InitHotkey(); OtBVfA:[  
BOOL UnInit(); R]/3`X9!d>  
#endif qa.nm4"6+  
+%UfnbZ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. /hQTV!\u  
#include "stdafx.h" 0h _9  
#include "hook.h" T oTehVw  
#include <windowsx.h> L(fOe3 v  
#ifdef _DEBUG g\,pZ]0i  
#define new DEBUG_NEW >h(n8wTP  
#undef THIS_FILE +ZQf$@+  
static char THIS_FILE[] = __FILE__; bLhTgss](  
#endif ;wa- \Z  
#define MAX_KEY 100 l#Ipo5=  
#define CTRLBIT 0x04 9l]+ rs +  
#define ALTBIT 0x02 Hca vA{H  
#define SHIFTBIT 0x01 }i^]uW*h  
#pragma data_seg("shareddata") B8:G1r5G/  
HHOOK hHook =NULL; &'TZU"_  
UINT nHookCount =0; m6a`OkP  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey *GH` u*C_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT f(6`5/C  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /q^)thJ~  
static int KeyCount =0; $BXZFC_1S  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift qRZv[T%*Q  
#pragma data_seg() +vIpt{733  
HINSTANCE hins; anxg D?<+B  
void VerifyWindow(); I} q2)@  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) @@-n/9>vs  
//{{AFX_MSG_MAP(CHookApp) jAie[5  
// NOTE - the ClassWizard will add and remove mapping macros here.  MX2]Q  
// DO NOT EDIT what you see in these blocks of generated code! iVTC"v  
//}}AFX_MSG_MAP 07P/A^Mkx  
END_MESSAGE_MAP() {E@Fk,  
 LP-~;  
CHookApp::CHookApp() ="Zr.g~8  
{ W8z4<o[$  
 // TODO: add construction code here, O3/][\  
 // Place all significant initialization in InitInstance A<fKO <d  
} ;4>YPH  
I 8TqK  
CHookApp theApp; MKf|(6;~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?x1sm"]p'  
{ _~/F-  
 BOOL bProcessed=FALSE; %UT5KYd!=N  
 if(HC_ACTION==nCode) @a$_F3W  
 { LmWZ43Z"@  
  if((lParam&0xc0000000)==0xc0000000){// Key up Kkcb' aDR  
   switch(wParam) m!Cvd9X=  
   { }Go?j# !  
    case VK_MENU: d,8L-pT$FM  
     MaskBits&=~ALTBIT; t(AW2{%}  
     break; 4'upbI  
    case VK_CONTROL: Oi%\'biM  
     MaskBits&=~CTRLBIT; e=Ko4Ao2y  
     break; <`rmQ`(}s  
    case VK_SHIFT: %A64AJZ  
     MaskBits&=~SHIFTBIT; KSDz3qe  
     break; b+Sq[  
    default: //judge the key and send message VwvL  
     break; 1yC_/Va1  
   } gB|>[6  
   for(int index=0;index<MAX_KEY;index++){ -FpZZ8=,M2  
    if(hCallWnd[index]==NULL) -@L7! ,j  
     continue; =z^ 2KH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SQ'\Kd=  
    { ~tx|C3A`d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); E)sC:oO  
     bProcessed=TRUE; '2Q[g0VR  
    } u_H=Xm)9  
   } Z*/{^ zsE  
  } !l NCuR/T  
  else if((lParam&0xc000ffff)==1){ //Key down -w'  
   switch(wParam) G\&9.@`k  
   { mv] .  
    case VK_MENU: -UY5T@as  
     MaskBits|=ALTBIT; : N9,/-s  
     break; E+z),"QA  
    case VK_CONTROL: -[/tS<U  
     MaskBits|=CTRLBIT; k;/K']4y  
     break; TWE>"8]  
    case VK_SHIFT: J;HYGu:  
     MaskBits|=SHIFTBIT; I\e/ Bv^  
     break; =r|e]4  
    default: //judge the key and send message idsBw!DB  
     break; )|3BS`  
   } B|d-3\sn  
   for(int index=0;index<MAX_KEY;index++) dynkb901s  
   { {=K);z  
    if(hCallWnd[index]==NULL) &s6;2G&L$  
     continue; b'q ru~i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X* 4C?v  
    { I+2#k\y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #zmt x0  
     bProcessed=TRUE; $40G$w  
    } 'h} (>%  
   } w'[JfMuP  
  } d*$L$1S  
  if(!bProcessed){ (A(j.[4a  
   for(int index=0;index<MAX_KEY;index++){ s.|OdC>U =  
    if(hCallWnd[index]==NULL) ly[j=vBV  
     continue; {%wF*?gk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =hRo#]{(K  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %_Q+@9  
   } Ec/&?|$  
  } .*}!XKp0j  
 } A1Ru&fd!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); sqXwDy+.  
} i%@blz:_Y  
|$|B0mj  
BOOL InitHotkey() Es<& 6  
{ K_! R   
 if(hHook!=NULL){ eI,'7u4q  
  nHookCount++; srlxp_^  
  return TRUE; T.(C`/VM  
 } A_e&#O  
 else /a,"b8  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); rEHlo[7^  
  if(hHook!=NULL) o|G'vMph  
   nHookCount++; $^:s)Yv  
  return (hHook!=NULL); ($nQmr;t  
} `T\_Wje(  
BOOL UnInit() Ztl?*zL  
{ 'm=TBNQTS  
 if(nHookCount>1){ A"tE~m;"7  
  nHookCount--; o5B]?ekpq  
  return TRUE; 6Y`rQ/F  
 } ]l7rM"  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ~nJ"#Q_T  
 if(unhooked==TRUE){ %1mIngW=g  
  nHookCount=0; (H^)wDb  
  hHook=NULL; ayYl3  
 } aT4I sPA?_  
 return unhooked; uG7?:) pxv  
} vpq"mpfkh  
p[Zk;AT~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3AcS$.G  
{ Rp+Lu  
 BOOL bAdded=FALSE; bvW3[ V  
 for(int index=0;index<MAX_KEY;index++){ ,(i`gH{D  
  if(hCallWnd[index]==0){ T)MX]T  
   hCallWnd[index]=hWnd; {S@gjMuN  
   HotKey[index]=cKey; s"UUo|hM  
   HotKeyMask[index]=cMask; A$g'/QM  
   bAdded=TRUE; j/t)=c  
   KeyCount++; T mK[^  
   break; mxnu\@}(  
  } |.z4VJi4  
 } {uDH-b(R  
 return bAdded; 2BKiA[ ;;  
} kyi"U A82  
1l5'N=hL  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J#IVu?B  
{ ;il+C!6zpf  
 BOOL bRemoved=FALSE; b_&:tE--]  
 for(int index=0;index<MAX_KEY;index++){ k4d;4D?  
  if(hCallWnd[index]==hWnd){ w~C\5 i  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -x{@D{Q%  
    hCallWnd[index]=NULL; ,. zHG  
    HotKey[index]=0; I`77[  
    HotKeyMask[index]=0; `_()|;!y  
    bRemoved=TRUE; Up1 n0  
    KeyCount--; llN/  
    break; x4i&;SP0  
   } Bz(L}V]\k  
  } URbHVPCPb  
 } XRmE  
 return bRemoved; +B[XTn,Cru  
} Q#F9&{'l  
Aj8zFt ]  
void VerifyWindow() ]eUD3WUe>q  
{ 4T6: C?V  
 for(int i=0;i<MAX_KEY;i++){ 0GW69 z  
  if(hCallWnd!=NULL){ 5yyc 0UG  
   if(!IsWindow(hCallWnd)){ F}.R -j#  
    hCallWnd=NULL; ;}lsD1S:  
    HotKey=0; J%]5C}v \  
    HotKeyMask=0; )<%CI#s#  
    KeyCount--; ^-L nO%h?  
   } n&!q9CR`  
  } ~Ede5Vg!!2  
 } #@' B\!<@=  
} JXjH}C  
^RE[5h6^q  
BOOL CHookApp::InitInstance() L&KL]n  
{ P2&0bNY  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Kum" }ux  
 hins=AfxGetInstanceHandle(); ^M1jv(  
 InitHotkey(); Uw]o9 e0S  
 return CWinApp::InitInstance(); }vU^g PH  
} 7~r_nP_  
<Mndr 8 H  
int CHookApp::ExitInstance() ay =B<|!  
{ ~z^49Ys:  
 VerifyWindow(); ;?q-]J?  
 UnInit(); j115:f  
 return CWinApp::ExitInstance(); ]Q,&7D Ah  
} F~0iJnF  
M6ZXq6J  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >;]S+^dXY  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Hh%"  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ i%GiWanG  
#if _MSC_VER > 1000 Z`f?7/"B  
#pragma once 1g,Ofr  
#endif // _MSC_VER > 1000 B}P!WRNmln  
1Vkb}A,'  
class CCaptureDlg : public CDialog 7|"l/s9,  
{ Y3#8]Z_"}O  
 // Construction W9{i~.zo  
 public: qu.AJ*  
  BOOL bTray; M+M  ;@3  
  BOOL bRegistered; k& M~yb  
  BOOL RegisterHotkey(); XI:+EeM?  
  UCHAR cKey; JC`;hY  
  UCHAR cMask; 2I3H?Lrx!m  
  void DeleteIcon(); f*:N*cC  
  void AddIcon(); 39m8iI%w[  
  UINT nCount; vTo+jQs^  
  void SaveBmp(); bxPJ5oT  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor A>,kmU5  
  // Dialog Data 3kh!dL3D  
  //{{AFX_DATA(CCaptureDlg) WL|71?@C  
  enum { IDD = IDD_CAPTURE_DIALOG }; :`K2?;DC8  
  CComboBox m_Key; NiEz3ODSi  
  BOOL m_bControl; Xq_h C"s  
  BOOL m_bAlt; 2s=zT5  
  BOOL m_bShift; ~;-2eKw  
  CString m_Path; 0eKLp8;Lh  
  CString m_Number; @NiLKcL#  
  //}}AFX_DATA \Unawv~  
  // ClassWizard generated virtual function overrides {3SK|J`  
  //{{AFX_VIRTUAL(CCaptureDlg) Q,:h`%V  
 public: elR1NhB|p  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -]-0]*oAp  
 protected: &> _aY #  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support j+>[~c;0)  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -tx%#(?wH  
  //}}AFX_VIRTUAL c (29JZ  
  // Implementation I %sw(uoE  
 protected: "$b{EYq6  
  HICON m_hIcon; N A_8<B^  
  // Generated message map functions Q-A_8  
  //{{AFX_MSG(CCaptureDlg) eoFG$X/PO  
  virtual BOOL OnInitDialog(); @My RcC  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); K47.zu  
  afx_msg void OnPaint(); ,<C~DSAyZ  
  afx_msg HCURSOR OnQueryDragIcon(); [vz2< genn  
  virtual void OnCancel(); ?)[=>Kp  
  afx_msg void OnAbout(); Sj:c {jyJd  
  afx_msg void OnBrowse(); GY5JPl  
  afx_msg void OnChange(); xOr"3;^  
 //}}AFX_MSG O>I%O^  
 DECLARE_MESSAGE_MAP() =(~*8hJ  
}; a^^OI|?  
#endif {u0sbb(  
@\:@_}Z`_}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file PN= 5ICT  
#include "stdafx.h" c,]fw2  
#include "Capture.h" yRD tPK"E-  
#include "CaptureDlg.h" O'(D:D?  
#include <windowsx.h> s'd\"WaQV  
#pragma comment(lib,"hook.lib") 6;@:/kl t  
#ifdef _DEBUG _RS CyV  
#define new DEBUG_NEW f =A#:d  
#undef THIS_FILE \ [M4[Qlq  
static char THIS_FILE[] = __FILE__; "rc QS H  
#endif [w-# !X2y  
#define IDM_SHELL WM_USER+1 ?!$Dr0r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0'Qvis[kt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dtj b(*x  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 82V;J 8T?  
class CAboutDlg : public CDialog -O r\  
{ !HtW~8|:  
 public: oA:`=f%\  
  CAboutDlg(); . Y$xNLoP[  
  // Dialog Data ]dV $H  
  //{{AFX_DATA(CAboutDlg) ++ 5!8Nv  
  enum { IDD = IDD_ABOUTBOX }; l)~$/#k  
  //}}AFX_DATA h#dfhcU>  
  // ClassWizard generated virtual function overrides 5Vdy:l  
  //{{AFX_VIRTUAL(CAboutDlg) 3[?;s}61  
 protected: O2f-{jnTz,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }jP/XO1f  
  //}}AFX_VIRTUAL @7;}6,)  
  // Implementation Q'hs,t1<  
 protected: |eFaOL|  
  //{{AFX_MSG(CAboutDlg) ~$rSy|19  
  //}}AFX_MSG ynf!1!4  
  DECLARE_MESSAGE_MAP() &OkPO|  
}; |VjD. ]I  
5/T#>l<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) h Z/p'  
{ 7AqbfLO  
 //{{AFX_DATA_INIT(CAboutDlg) z5D*UOy5M  
 //}}AFX_DATA_INIT $"}[\>e*{  
} _ /Eg_dQ~@  
kY9$ M8b  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) x8C *  
{ _KBa`lhE  
 CDialog::DoDataExchange(pDX); \/nSRAk  
 //{{AFX_DATA_MAP(CAboutDlg) -G'3&L4 D  
 //}}AFX_DATA_MAP ] r%fAm j  
} 3qDbfO[  
L s3r( Tf  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &m]jYvRc  
 //{{AFX_MSG_MAP(CAboutDlg) Z.rhM[*+0C  
 // No message handlers e~9g~k]s  
 //}}AFX_MSG_MAP ~BE=z:  
END_MESSAGE_MAP() :~ &#9  
 tO D}&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) &' y}L'  
: CDialog(CCaptureDlg::IDD, pParent) B?e] Ht  
{ r%>7n,+o  
 //{{AFX_DATA_INIT(CCaptureDlg) OHnsfXO_V  
  m_bControl = FALSE; glkH??S  
  m_bAlt = FALSE; rt?*eC1b+Z  
  m_bShift = FALSE; aZ|S$-}  
  m_Path = _T("c:\\"); W[e2J&G  
  m_Number = _T("0 picture captured."); bweAmSs  
  nCount=0; 5d# 73)x$  
  bRegistered=FALSE; $:UD #eh0?  
  bTray=FALSE; ~fzuz'"^  
 //}}AFX_DATA_INIT TN08 ,:k  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <^W5UU#Pg  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); y@AUSh;  
} [By|3 bI  
L. S/Mv  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7h:EU7  
{ ^gY'^2bzxu  
 CDialog::DoDataExchange(pDX); 5`i+a H(  
 //{{AFX_DATA_MAP(CCaptureDlg) EY c)v6[  
  DDX_Control(pDX, IDC_KEY, m_Key); 3{Zd<JYg4-  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); hvA|d=R(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); m%.[|sZ3EM  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); gO@LJ  
  DDX_Text(pDX, IDC_PATH, m_Path); uu>R)iTQ%S  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Zw<<p|{)<  
 //}}AFX_DATA_MAP ; 3sjTqD  
} FF|M7/[~  
[o7Qr?RN  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =+[` 9  
//{{AFX_MSG_MAP(CCaptureDlg) F[)tg#}@G  
 ON_WM_SYSCOMMAND() g&8-X?^Q  
 ON_WM_PAINT() tbfwgK  
 ON_WM_QUERYDRAGICON() i'1 MZ%.  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) I= cayR  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) PIoBKCJ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^V]IPGV  
//}}AFX_MSG_MAP A^zd:h-  
END_MESSAGE_MAP() Mp[2Auf  
e)87 & 7  
BOOL CCaptureDlg::OnInitDialog() : &~LPmJ  
{ $U)nrn i  
 CDialog::OnInitDialog(); Pmd5P:n*,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); M7-2;MZ  
 ASSERT(IDM_ABOUTBOX < 0xF000); _kBx2>qQ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Jc`tOp5  
 if (pSysMenu != NULL) [8Z !dj   
 { Ht]O:io`  
  CString strAboutMenu; 5v=e(Ph +  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @Q&k6.{4Z  
  if (!strAboutMenu.IsEmpty()) H7meI9L  
  { a6;5mx  
   pSysMenu->AppendMenu(MF_SEPARATOR); /xB O;'rR  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); x`2du/ C  
  } gr# |ZK.`  
 } s3K!~v\L]  
 SetIcon(m_hIcon, TRUE); // Set big icon 'tjqfR  
 SetIcon(m_hIcon, FALSE); // Set small icon k/BlkjlNE  
 m_Key.SetCurSel(0); lvLz){  
 RegisterHotkey(); p9S>H  
 CMenu* pMenu=GetSystemMenu(FALSE); [| N73m,&  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !\^W*nQ>l  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); dx$+,R~y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); O]j<$GG!  
 return TRUE; // return TRUE unless you set the focus to a control ~]'yUd1gSZ  
} gg Nvm  
Y n0iu$;n  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :-(qqC:  
{ %c8@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +jKu^f6  
 { o*oFCR]j  
  CAboutDlg dlgAbout; .kgt? r  
  dlgAbout.DoModal(); X!@ Y ,  
 } "M^mJl&*b  
 else ySF^^X $J  
 { Y_~otoSoY  
  CDialog::OnSysCommand(nID, lParam); (Ap?ixrR_  
 } )#`&[9d-  
} bU/YU0ZIT  
'T;;-M3*  
void CCaptureDlg::OnPaint() -D%mVe)&+  
{ I<+:Ho=6  
 if (IsIconic()) "z_},TCy  
 { HuQdQ*Q  
  CPaintDC dc(this); // device context for painting vTIRydg2b  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); t >.=q:  
  // Center icon in client rectangle 1jaK N*  
  int cxIcon = GetSystemMetrics(SM_CXICON); cIP%t pTW.  
  int cyIcon = GetSystemMetrics(SM_CYICON); +*aC \4w  
  CRect rect; 7 y$a=+D i  
  GetClientRect(&rect); J@#rOOu  
  int x = (rect.Width() - cxIcon + 1) / 2; $\M];S=CY  
  int y = (rect.Height() - cyIcon + 1) / 2; }02(Y!Gh  
  // Draw the icon P?zaut  
  dc.DrawIcon(x, y, m_hIcon); agQD d8oX  
 } vF/wV'Kk  
 else e0<O6  
 { nyBT4e  
  CDialog::OnPaint(); Zq5~M bldh  
 } 9\0$YY%  
} T8yMaC  
io@f5E+?  
HCURSOR CCaptureDlg::OnQueryDragIcon() *.Z~f"SZy*  
{ M|{NC`fa  
 return (HCURSOR) m_hIcon; 0s RcA-9  
} jdx T662q  
~=|QPO(d  
void CCaptureDlg::OnCancel() J93xxj  
{ `; j$]  
 if(bTray) ff~1>=^  
  DeleteIcon(); : LT'#Q8  
  CDialog::OnCancel(); TO G:N~  
} !0F+qzGG7  
tg\o"QKW9  
void CCaptureDlg::OnAbout() *d PbV.HCl  
{ 81w"*G5AM  
 CAboutDlg dlg; c%1{l]   
 dlg.DoModal(); $dA]GWW5A  
} G.PRPl  
Ba** S8{/`  
void CCaptureDlg::OnBrowse() :\y' ?d- Q  
{ JV_VM{w{K  
 CString str; f[ia0w5 m  
 BROWSEINFO bi;  T;V!>W37  
 char name[MAX_PATH]; DgY !)cS  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |"+Uf w^  
 bi.hwndOwner=GetSafeHwnd(); `3@?)xa  
 bi.pszDisplayName=name; 1I)oT-~  
 bi.lpszTitle="Select folder"; C2\zbC[qm  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; A~ _2"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); *N"CV={No  
 if(idl==NULL) n=|% H'U  
  return; C7DwA/$D  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <XN=v!2;  
 str.ReleaseBuffer(); ]'-y-kqY  
 m_Path=str; n7yp6 Db  
 if(str.GetAt(str.GetLength()-1)!='\\') -:OJX#j  
  m_Path+="\\"; ml /S|`Drk  
 UpdateData(FALSE); c] t@3m  
} ?Ygd|a5  
 Lw%_xRn)  
void CCaptureDlg::SaveBmp() [^^Pl:+  
{ vu#ZLq  
 CDC dc; +w"?q'SnF  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); oYt 34@{?  
 CBitmap bm; C\B4Uu6q  
 int Width=GetSystemMetrics(SM_CXSCREEN); j-.Y!$a%6  
 int Height=GetSystemMetrics(SM_CYSCREEN); 8m=O408Q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); OmS8cSYGc  
 CDC tdc; ncUS8z  
 tdc.CreateCompatibleDC(&dc); GR4DxlX  
 CBitmap*pOld=tdc.SelectObject(&bm); ZY@ntV?  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); P(/eVD#v  
 tdc.SelectObject(pOld); J0oeCb  
 BITMAP btm; !&NrbiuN  
 bm.GetBitmap(&btm); `uH7~ r^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; euVj,m  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); kX8NRPW  
 BITMAPINFOHEADER bih; iq[IZdza  
 bih.biBitCount=btm.bmBitsPixel; xc\zRsY`  
 bih.biClrImportant=0; d325Cw?  
 bih.biClrUsed=0; vm'ZA7f6  
 bih.biCompression=0; D /GE-lq  
 bih.biHeight=btm.bmHeight; RBBmGZ  
 bih.biPlanes=1; lk[Y6yE  
 bih.biSize=sizeof(BITMAPINFOHEADER); )^+hm+27v  
 bih.biSizeImage=size; ~"NuYM#@  
 bih.biWidth=btm.bmWidth; 1hE{(onI  
 bih.biXPelsPerMeter=0; N_Kdi%q  
 bih.biYPelsPerMeter=0; Vzo< ma^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;BYuNQr  
 static int filecount=0; I~&9c/&  
 CString name; -e sQyLx  
 name.Format("pict%04d.bmp",filecount++); -6~.;M 5  
 name=m_Path+name; P;mp)1C  
 BITMAPFILEHEADER bfh; Bv' %$}}-  
 bfh.bfReserved1=bfh.bfReserved2=0; RZ;s_16GQ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Poa&htxe1  
 bfh.bfSize=54+size; py+\e" s  
 bfh.bfOffBits=54; S(?A3 H  
 CFile bf; o]<9wc:FZ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ a^pbBDi W  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Jazgn5  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); A.dbb'^  
  bf.WriteHuge(lpData,size); 'W yWO^Bdk  
  bf.Close(); akU2ToP  
  nCount++; {]Hv*{ ]  
 } /-G_0 A2wF  
 GlobalFreePtr(lpData); ai-rF^ehC  
 if(nCount==1) Bc[~'gn  
  m_Number.Format("%d picture captured.",nCount); w,$qsmR  
 else "H<us?r{  
  m_Number.Format("%d pictures captured.",nCount); k)|.<  
  UpdateData(FALSE); ;i'[c`  
} %dv?n#Uf  
l{>j8Ln  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) r[H8;&EL  
{ @NqwJ.%g  
 if(pMsg -> message == WM_KEYDOWN) q!?*M?Oz  
 { a6^_iSk  
  if(pMsg -> wParam == VK_ESCAPE) 2vX $:4  
   return TRUE; 8W?dWj  
  if(pMsg -> wParam == VK_RETURN) 7t:tS7{}  
   return TRUE; stBe ^C  
 } Z0m`%(MJa  
 return CDialog::PreTranslateMessage(pMsg); sA77*T  
} j7k}!j_O{  
+a 1iZ bh  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8.Y|I5l7G  
{ aR/?YKA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \r[u>7I  
  SaveBmp(); IT&,?u%  
  return FALSE; %S}uCqcAK  
} >([,yMIY  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3m` >D e  
 CMenu pop; ~IS8DW$;  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); fyA-*)oHv  
 CMenu*pMenu=pop.GetSubMenu(0); kMMgY?  
 pMenu->SetDefaultItem(ID_EXITICON); $i5J}  
 CPoint pt; W>)0=8#\  
 GetCursorPos(&pt); mpMAhm:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %kjG[C  
 if(id==ID_EXITICON) !W9:)5^X  
  DeleteIcon(); `+"(GaZ  
 else if(id==ID_EXIT) y{>f^S<  
  OnCancel(); ?! 6Itkg  
 return FALSE; @ 2)nhW/z6  
} %dFJ'[jDL  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Qop,~yK  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ABX%oZ7[|o  
 AddIcon(); J5I@*f)l  
 return res; qul#)HI  
} dkZe.pv$j  
>m,hna]RZ  
void CCaptureDlg::AddIcon() |uqI}6h.  
{ 9ziFjP+1  
 NOTIFYICONDATA data; <78|~SKAV  
 data.cbSize=sizeof(NOTIFYICONDATA); _wS=*-fT  
 CString tip; (^m] 7l  
 tip.LoadString(IDS_ICONTIP); 0f.j W O  
 data.hIcon=GetIcon(0); <ak[`]  
 data.hWnd=GetSafeHwnd(); q!eE~O;A  
 strcpy(data.szTip,tip); aQtd6L+ J  
 data.uCallbackMessage=IDM_SHELL; @wI>0B  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ExS5RV@v'  
 data.uID=98; kz7FQE  
 Shell_NotifyIcon(NIM_ADD,&data); VTM* 1uXS>  
 ShowWindow(SW_HIDE); :aej.>I0  
 bTray=TRUE; -}|L<~  
} KBmOi  
 % D  
void CCaptureDlg::DeleteIcon() O {1" I  
{ EIg~^xK  
 NOTIFYICONDATA data; 'Oue 1[  
 data.cbSize=sizeof(NOTIFYICONDATA); 3I_^F&T  
 data.hWnd=GetSafeHwnd(); pg4W?N`  
 data.uID=98; % /VCjuV  
 Shell_NotifyIcon(NIM_DELETE,&data); &uK(. @  
 ShowWindow(SW_SHOW); 6*q1%rs:w  
 SetForegroundWindow(); ^{4BcM7eH  
 ShowWindow(SW_SHOWNORMAL); =cS&>MT  
 bTray=FALSE; jtP*C_Scv/  
} :ZV |8xI  
^w60AqR8  
void CCaptureDlg::OnChange() HcsV q+  
{ j|k/&q[St  
 RegisterHotkey(); s)a-ky(  
} 6]?mjG6  
3' i6<  
BOOL CCaptureDlg::RegisterHotkey() ]P0%S@]  
{ &v{#yzM  
 UpdateData(); #1DEZ4]jjY  
 UCHAR mask=0; vW1^  
 UCHAR key=0; Y 3BJ@sqz  
 if(m_bControl)  $3^M-w  
  mask|=4; YsVmU  
 if(m_bAlt) ](w)e p~;3  
  mask|=2; XB7Aa)  
 if(m_bShift) /Sw~<B!8N  
  mask|=1; b&:v6#i  
  key=Key_Table[m_Key.GetCurSel()]; _x,X0ncv]@  
 if(bRegistered){ hG?y)g\A  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); QxYm3x5  
  bRegistered=FALSE; t0m;tb bg  
 }   3%kUj  
 cMask=mask; 4>*=q*<V5E  
 cKey=key; .| 4P :r  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4v\HaOk  
 return bRegistered; 9Da{|FyrD  
} gyw=1q+  
|LZ;2 i  
  四、小结 eiKY az  
'Qy6m'esW  
  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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