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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: "P`V|g  
  Alaq![7MDP  
  一、实现方法 |H 0+.f;  
Bh?K_{e  
  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: i6M_Gk}  
Au,xIe!t  
#pragma data_seg("shareddata") j@$p(P$  
HHOOK hHook =NULL; //钩子句柄 cx M=#Go  
UINT nHookCount =0; //挂接的程序数目 dQLR%i#P8  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 XzGPBi  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 |k3ZdM  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;=>4 '$8  
static int KeyCount =0; wND0KiwH  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .t|vwx  
#pragma data_seg() !Vl>?U?AN  
5xL%HX[S  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 5CH9m[S  
tK{2'e6x  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: !7t,(Id8  
]}H;`H  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 4.2qt  
cKey,UCHAR cMask) &P Wz4hZ  
{ ?khwupdi  
 BOOL bAdded=FALSE; CS2AKa@`  
 for(int index=0;index<MAX_KEY;index++){ qwJeeax  
  if(hCallWnd[index]==0){ H/'tSb  
   hCallWnd[index]=hWnd; /H&:  
   HotKey[index]=cKey; )MqF~[k<-  
   HotKeyMask[index]=cMask; B]~#+rMK  
   bAdded=TRUE; `G> 6  
   KeyCount++; #R v&b@K  
   break; lx,^Y 647  
  } EeC5HgIU'C  
 } ;|&Ak_I2G  
 return bAdded; YFgQ!\&59  
} *.4;7#  
//删除热键 AHX_I  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4HEp}Y"}V  
{ vk:@rOpl  
 BOOL bRemoved=FALSE; rCqcl  
 for(int index=0;index<MAX_KEY;index++){ M0g!"0?  
  if(hCallWnd[index]==hWnd){ ~E&drl\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ fM,U|  
    hCallWnd[index]=NULL; /Hb'3,jN  
    HotKey[index]=0; &niROM,;K  
    HotKeyMask[index]=0; 7c$;-O  
    bRemoved=TRUE;  Ub(zwR;  
    KeyCount--; a}eM ny  
    break; S*~v9+  
   } G m40u/  
  } l@7X gsey  
 } uCuXY#R+  
 return bRemoved; 8t3@ Hi  
} 1V(tt{  
10xo<@l  
E&r*[;$  
  DLL中的钩子函数如下: e#]=-^  
](c[D9I!8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Tx"}]AyB6  
{ <Okk;rj2  
 BOOL bProcessed=FALSE; fXCx!3m  
 if(HC_ACTION==nCode) Zo  
 { 6N[XWyS  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 d51l7't  
   switch(wParam) 4SSq5Ve<  
   {  N 4Yvt&  
    case VK_MENU: ];bB7+  
     MaskBits&=~ALTBIT; cU7 c}?J<  
     break; KY$6=/?U_  
    case VK_CONTROL: mwLp~z%OX  
     MaskBits&=~CTRLBIT; ~_=ohb{  
     break; jz(}P8  
    case VK_SHIFT: j.OPDe{LU  
     MaskBits&=~SHIFTBIT; Cc^`M9dP  
     break; -:wC 920+  
    default: //judge the key and send message P<yd  
     break; \:ntqj&A|  
   } |u,2A1  
   for(int index=0;index<MAX_KEY;index++){ 7Fb |~In<Z  
    if(hCallWnd[index]==NULL) tn};[r  
     continue; W _(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -~T?xs0_  
    { v`8dRVN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); y)_T!&ze  
     bProcessed=TRUE; Pda(O;aNU  
    } F3[3~r  
   } PW)XDo7  
  } I;kKY  
  else if((lParam&0xc000ffff)==1){ //有键按下 is_`UDaB  
   switch(wParam) f.rc~UI?  
   { O.4ty)*  
    case VK_MENU: (m|w&oA/  
     MaskBits|=ALTBIT; SA s wP  
     break; H@Dj$U  
    case VK_CONTROL: vB(tpki|  
     MaskBits|=CTRLBIT; ]5b%r;_  
     break; %IGcn48J  
    case VK_SHIFT: gf2<dEff  
     MaskBits|=SHIFTBIT; ZVu&q{s,  
     break; .nX+!EXeS  
    default: //judge the key and send message * Zb-YA  
     break; [|<2BQX  
   } ;7CE{/Bq.p  
   for(int index=0;index<MAX_KEY;index++){ D/C,Q|Ya6  
    if(hCallWnd[index]==NULL) y1P KoN|K  
     continue; `iuo([E d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }ybveZxv5A  
    { @+1-_Q`s/R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M rpn^C2)  
     bProcessed=TRUE; !7XAc,y  
    } Z!o&};_j  
   } \9*wo9cV  
  } ImQ?<g8$  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 `Cy-*$$  
   for(int index=0;index<MAX_KEY;index++){ Enr8"+.(  
    if(hCallWnd[index]==NULL) vB >7W  
     continue; i_8q!CL@{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A9^t$Ii  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); bQc-ryC+.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 yZFm<_9>  
   } [U[saR\  
  } #x Z7%    
 } 'ms&ty*T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Dl hb'*@  
} f%ude@E3  
2VaQxctk  
  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.!Ny5A  
y)N57#e  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GQ~wx1jj1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $OU,| D  
td{M%D,R"  
  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:  9')  
:X7"fX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D> wq4u  
{ t~m >\(&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) V"=(I'X  
 { G/T oiUY  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ??Zh$^No:  
  SaveBmp(); Z>1\|j  
  return FALSE; m~a'  
 } g2;!AI5f  
 …… //其它处理及默认处理 ?h)Z ;,}  
} v:0.  
~_^#/BnAl  
k fS44NV  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 0 =#)-n  
h6c0BmS{1  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 t3%[C;@wB  
FTvFtdY  
  二、编程步骤 j?sq i9#  
'?Fw]z1$  
  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"; K4938 v  
-Bymt[  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 2uw1R;zw  
[>l 2E  
  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; QT X5F5w  
w~EBm=v_>  
  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; 1"k"<{%  
y7J2: /@[x  
  5、 添加代码,编译运行程序。 .9X,)^D  
&c<0g`x  
三、程序代码 c zTr_>  
wWV`k  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL lt 74`9,f  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ()L[l@m  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ [:Kl0m7  
#if _MSC_VER > 1000 *3 .+19Q  
#pragma once 7 ,Tg>,%Q  
#endif // _MSC_VER > 1000 8!87p?Mz  
#ifndef __AFXWIN_H__ R_iQLBrd  
#error include 'stdafx.h' before including this file for PCH D{1k{/cF  
#endif Z6@W)QX  
#include "resource.h" // main symbols 'r_{T=  
class CHookApp : public CWinApp *h59Vaoc  
{ {=n-S2%  
 public: ;OjxEXaq  
  CHookApp(); w6ZyMR,T  
  // Overrides Y>v(UU  
  // ClassWizard generated virtual function overrides &~`Ay4hq  
  //{{AFX_VIRTUAL(CHookApp) [|{2&830  
 public: nk8jXZ"w  
  virtual BOOL InitInstance(); w7d(|`  
  virtual int ExitInstance(); CMk0(sztU_  
  //}}AFX_VIRTUAL Y"J' 'K  
  //{{AFX_MSG(CHookApp)   -58  
  // NOTE - the ClassWizard will add and remove member functions here. Wp!#OY1?  
  // DO NOT EDIT what you see in these blocks of generated code ! xD[O8vQE  
  //}}AFX_MSG ux-puG  
  DECLARE_MESSAGE_MAP() Kgev*xg  
}; 0< i]ph  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Imi;EHW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |#hj O3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GF(<!PC  
BOOL InitHotkey(); @lvvI<U  
BOOL UnInit(); }"k+e^0^  
#endif )*j>g38?  
r 334E  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1+`Bli]dE  
#include "stdafx.h" fZM)>  
#include "hook.h" 9a_B   
#include <windowsx.h> # `}(x;ge  
#ifdef _DEBUG !brXQj8D7  
#define new DEBUG_NEW p(B> N!:  
#undef THIS_FILE NCm>iEeY  
static char THIS_FILE[] = __FILE__; xw2dEvjgp%  
#endif !V|%n(O"  
#define MAX_KEY 100 v X=zqV  
#define CTRLBIT 0x04 6:Eu[PE~w  
#define ALTBIT 0x02 34k}7k~n  
#define SHIFTBIT 0x01 g5THkxp  
#pragma data_seg("shareddata") cBxBIC  
HHOOK hHook =NULL; U;%I" p`Z/  
UINT nHookCount =0; 8WT^ES~C  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey or2BG&W  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT X~ca8!Dq  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 6|# +  
static int KeyCount =0; f+*wDH  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ){ywk  
#pragma data_seg() $nX4!X  
HINSTANCE hins; SRL`!  
void VerifyWindow(); sfLH[Q?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 3awh>1N2 W  
//{{AFX_MSG_MAP(CHookApp) ;%u'w;sgq  
// NOTE - the ClassWizard will add and remove mapping macros here. +C`h*%BW  
// DO NOT EDIT what you see in these blocks of generated code! Grot3a  
//}}AFX_MSG_MAP gWlv;oq  
END_MESSAGE_MAP() NI(fJ%U  
'FVh/};Y.D  
CHookApp::CHookApp() aI8k:FK"  
{ ssdpwn'  
 // TODO: add construction code here, '<(S*&s  
 // Place all significant initialization in InitInstance rU^?Z  
} Yc5{M*w  
l5?fF6#j  
CHookApp theApp; L`$m<9w'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J$Huzs#  
{ pVuJ4+`  
 BOOL bProcessed=FALSE; #9HQW:On  
 if(HC_ACTION==nCode) s06tCwPp  
 { 3_%lN4sz  
  if((lParam&0xc0000000)==0xc0000000){// Key up Z^P]-CB|6A  
   switch(wParam) :wlX`YW+e  
   { v4X\LsOP  
    case VK_MENU: ZHA6BVVT  
     MaskBits&=~ALTBIT; .QwwGm  
     break; "rnZ<A}  
    case VK_CONTROL: y,I?3 p|S  
     MaskBits&=~CTRLBIT; D%PrwfR  
     break; N#C"@,}Y  
    case VK_SHIFT: WD"3W)!  
     MaskBits&=~SHIFTBIT; -K+" :kiS  
     break; eh`sfH  
    default: //judge the key and send message @y )'h]d  
     break; r3OTU$t?  
   } hqEn D  
   for(int index=0;index<MAX_KEY;index++){ PQ}q5?N  
    if(hCallWnd[index]==NULL) RPb/U8  
     continue; M$|r8%z1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1h.Ypz u  
    { ho 5mH{"OV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); YX||\  
     bProcessed=TRUE; n veHLHvC7  
    } k]J!E-yI8  
   } - v\n0Jt  
  } iw`,\V&  
  else if((lParam&0xc000ffff)==1){ //Key down !8cS1(a  
   switch(wParam) H l'za  
   { <IiX_*  
    case VK_MENU: f 7g?{M  
     MaskBits|=ALTBIT; :?!kZD!  
     break; .f+ul@o  
    case VK_CONTROL: |nfFI  
     MaskBits|=CTRLBIT; H@!\?5I  
     break; B,`B!rU  
    case VK_SHIFT: a}oFL%=?  
     MaskBits|=SHIFTBIT; v37TDY3;  
     break; L^}i7nJ  
    default: //judge the key and send message RbexsBq  
     break; 3*N-@;[>b  
   } aT v  
   for(int index=0;index<MAX_KEY;index++) XynDo^+ru  
   { %RlG~a  
    if(hCallWnd[index]==NULL) + ?z=,')  
     continue; I-@A{vvPK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y}G9(Ci&  
    { ]p,sve vo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ".n,R"EF  
     bProcessed=TRUE; bnso+cA  
    } W(5et5DN,  
   } eB]cPo4gW  
  } tbx* }uy2  
  if(!bProcessed){ :>@6\    
   for(int index=0;index<MAX_KEY;index++){ W u4` 3  
    if(hCallWnd[index]==NULL) cba  
     continue; }N^A (`L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Idy{(Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); R`)^eqB  
   } PEKU  
  } ^qn,b/>L  
 } iL^bf*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?Cg",k'  
}  s~A#B)wB  
`WjRb  
BOOL InitHotkey() O'<5PwhG  
{ {km~,]N  
 if(hHook!=NULL){ ^/K]id7 2  
  nHookCount++; wi7a_^{  
  return TRUE; 3^ct;gz  
 } 5>E]C=maD  
 else v#. %eF m  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4G:?U6  
  if(hHook!=NULL) H9@24NFb  
   nHookCount++; C'6 yt  
  return (hHook!=NULL); J(k\Pz*  
} ?`m#Y&Oi  
BOOL UnInit() PP2>v|  
{ l%$~X0%DM  
 if(nHookCount>1){ xq U@87[_  
  nHookCount--; {FIr|R&  
  return TRUE; cqP)1V]  
 } ~OuKewr\  
 BOOL unhooked = UnhookWindowsHookEx(hHook); i,[S1g  
 if(unhooked==TRUE){ )oEHE7y  
  nHookCount=0; 75u5zD   
  hHook=NULL; 4Nz@s^9  
 } -?m"+mUP  
 return unhooked; hJkP_( +J\  
} SN${cs%  
{8!\aYI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W@X/Z8.(  
{ jH 4,-  
 BOOL bAdded=FALSE; 9 n(.v}  
 for(int index=0;index<MAX_KEY;index++){ k<bA\5K  
  if(hCallWnd[index]==0){ ?3f-" K_r  
   hCallWnd[index]=hWnd; /(iq^  
   HotKey[index]=cKey; XXx]~m  
   HotKeyMask[index]=cMask; fyRSg B00$  
   bAdded=TRUE; cip"9|"  
   KeyCount++; \`FpBE_e)  
   break; ^)qOILn  
  } x] e &G!|  
 } )SX2%&N  
 return bAdded; @-L4<=$J  
} 7GY3 _`  
Ne 2tfiI`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Thlqe?  
{ 91|0{1  
 BOOL bRemoved=FALSE; OA_WjTwDs  
 for(int index=0;index<MAX_KEY;index++){ f Fr[ &\[  
  if(hCallWnd[index]==hWnd){ ?h7,q*rxk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ X&s@S5=r]  
    hCallWnd[index]=NULL; dX720/R  
    HotKey[index]=0; SxAZ2|/-  
    HotKeyMask[index]=0; jrF#DDH?I  
    bRemoved=TRUE; /h.hFM/  
    KeyCount--; |%V-|\GJ~j  
    break; ^HO'"/tB@D  
   } z0yPBt1W  
  } l\Q--  
 } W8@o7svrh  
 return bRemoved; M%U1?^j8  
} +2qCH^80  
| Ns-l (l  
void VerifyWindow() E`M, n ,  
{ n`W7g@Sg#I  
 for(int i=0;i<MAX_KEY;i++){ Rxl )[\A*  
  if(hCallWnd!=NULL){ `$fKS24u  
   if(!IsWindow(hCallWnd)){ WbIf)\  
    hCallWnd=NULL; ^]{)gk8P~2  
    HotKey=0; []\=(Uc;  
    HotKeyMask=0; dKG2f  
    KeyCount--; lRy^Wp  
   } /=+y[y3`  
  } 4!l%@R>O2  
 } x{o&nhuk[S  
} vv  F:  
d=*&=r0!C{  
BOOL CHookApp::InitInstance() O/N Ed)H!  
{ AW\#)Em  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >j%4U*  
 hins=AfxGetInstanceHandle(); [ST,/<?0  
 InitHotkey(); KF.d:  
 return CWinApp::InitInstance(); BEfP#h=hr  
} L/39<&W  
'yIz<o  
int CHookApp::ExitInstance() 8<2 [ F  
{ B %L dH  
 VerifyWindow(); h#e((j3-2Z  
 UnInit(); }$5e!t_K  
 return CWinApp::ExitInstance(); ZLN79r{T  
} 8|U-{"!O ?  
!_a@autj  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file RTXl3 jq  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) dXBXV>rbB  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ t>Ot)d  
#if _MSC_VER > 1000 V\2&?#GZ  
#pragma once qs Uob   
#endif // _MSC_VER > 1000 2k}8`P;  
<,X?+hr  
class CCaptureDlg : public CDialog +~ZFao qf  
{ oiKY2.yW  
 // Construction n[`KhRN  
 public: #_U[ T  
  BOOL bTray; ]"T1clZKd(  
  BOOL bRegistered; x&['g*[L0  
  BOOL RegisterHotkey(); 5 `Mos  
  UCHAR cKey; +{7/+Zz  
  UCHAR cMask; xO` `X<  
  void DeleteIcon(); Jh6 z5xUV  
  void AddIcon(); av; ~e<  
  UINT nCount; #[<XN s!"  
  void SaveBmp(); YU (|i}b  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ej^pFo  
  // Dialog Data k% -S7iQ  
  //{{AFX_DATA(CCaptureDlg) c_RAtM<n  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;vkk$ -  
  CComboBox m_Key; 9Z_!}eY2mc  
  BOOL m_bControl; |GqKa  
  BOOL m_bAlt; q'zV9  
  BOOL m_bShift; ndB [f  
  CString m_Path; Q!&@aKl  
  CString m_Number; ~A-1x!YiU  
  //}}AFX_DATA y wf@G; fK  
  // ClassWizard generated virtual function overrides {YT@$K]w,  
  //{{AFX_VIRTUAL(CCaptureDlg) 'U %L\v,  
 public: /^jV-Z`  
  virtual BOOL PreTranslateMessage(MSG* pMsg); &nXa /XIZ_  
 protected: Obl,Qa:5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wFHz<i!jr&  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); JPt0k  
  //}}AFX_VIRTUAL UwQyAD]Ht  
  // Implementation }o  {6  
 protected: A@HCd&h  
  HICON m_hIcon; *^WY+DV  
  // Generated message map functions ^CtA@4  
  //{{AFX_MSG(CCaptureDlg) sfuA {c'v  
  virtual BOOL OnInitDialog(); |mO4+:-~D+  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); DFUW^0N  
  afx_msg void OnPaint(); s+jL BY  
  afx_msg HCURSOR OnQueryDragIcon(); ^7zXi xp  
  virtual void OnCancel(); FJYc*l  
  afx_msg void OnAbout(); D3MRRv#  
  afx_msg void OnBrowse(); qL 0{w7  
  afx_msg void OnChange(); nxZ[E.-\  
 //}}AFX_MSG r:QLO~l/  
 DECLARE_MESSAGE_MAP() q/N1q&  
}; 4a6WQVS  
#endif e>a4v8  
sE Rm+x<  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }wkZ\q[  
#include "stdafx.h" 6_#:LFke  
#include "Capture.h" rgOc+[X  
#include "CaptureDlg.h" 1P17]j2C  
#include <windowsx.h> 9R6]OL)p  
#pragma comment(lib,"hook.lib") .dvOUt I[  
#ifdef _DEBUG WU" Lu  
#define new DEBUG_NEW BWHH:cX  
#undef THIS_FILE "{igrl8  
static char THIS_FILE[] = __FILE__; ]g0h7q)79  
#endif #3WKm*T/  
#define IDM_SHELL WM_USER+1 )>X C_ R  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5 ?{ytNCY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); e71dNL'$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <8[y2|UBt  
class CAboutDlg : public CDialog dhAkD-Lh  
{ &LD=Zp%  
 public: " Om4P|  
  CAboutDlg(); S# 9EBw7  
  // Dialog Data #,4CeD|(D,  
  //{{AFX_DATA(CAboutDlg) ^G~C#t^  
  enum { IDD = IDD_ABOUTBOX }; },;ymk|g[  
  //}}AFX_DATA J_H=GHMp}  
  // ClassWizard generated virtual function overrides e~+VN4D&b>  
  //{{AFX_VIRTUAL(CAboutDlg) 8FmRD  
 protected: AzmISm  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9:\YEs"  
  //}}AFX_VIRTUAL PU\?eA  
  // Implementation :qQpBr$  
 protected: hj_%'kk-A  
  //{{AFX_MSG(CAboutDlg) y`n'>F11  
  //}}AFX_MSG x2M'!VK>n1  
  DECLARE_MESSAGE_MAP() d;-/F b{4  
}; 7 z#Xf  
ofu {g  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) n:#gKR-J  
{ `]0E)  
 //{{AFX_DATA_INIT(CAboutDlg) ox2?d<dC6  
 //}}AFX_DATA_INIT (i"@{[IP  
} WN+D}z]  
Jn/"(mM  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "")I1 iO g  
{ bhqs%B!:  
 CDialog::DoDataExchange(pDX); zxV,v*L)  
 //{{AFX_DATA_MAP(CAboutDlg) -q}c;0vL-a  
 //}}AFX_DATA_MAP 9PM\D@A{  
} Xaca=tsO  
=(-oQ<@v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @/w ($w"  
 //{{AFX_MSG_MAP(CAboutDlg) f'2Ufd|J|  
 // No message handlers _W3>Km-A=/  
 //}}AFX_MSG_MAP -ST[!W V  
END_MESSAGE_MAP() Y5Ub[o  
c~0hu*&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) r/32pY  
: CDialog(CCaptureDlg::IDD, pParent) #RG/B2  
{ )0Lno|l  
 //{{AFX_DATA_INIT(CCaptureDlg) ^Iz(V2  
  m_bControl = FALSE; V\ 7O)g  
  m_bAlt = FALSE; ;Rz+4<  
  m_bShift = FALSE; ZMI!Sl  
  m_Path = _T("c:\\"); 9AxeA2/X  
  m_Number = _T("0 picture captured."); KqE5{ q  
  nCount=0; BJ]4j-^o  
  bRegistered=FALSE; :JEzfI1  
  bTray=FALSE; k!^Au8Up?  
 //}}AFX_DATA_INIT BM@:=>ypQ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 NFEF{|}BM  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -S ASn  
} |K H&,  
RJz$$,RU  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $jL{l8x  
{ yd-r7iq  
 CDialog::DoDataExchange(pDX); +a{P,fRl@  
 //{{AFX_DATA_MAP(CCaptureDlg) :ziV3jRM  
  DDX_Control(pDX, IDC_KEY, m_Key); l.V{H<v}  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); =Z($n: m=*  
  DDX_Check(pDX, IDC_ALT, m_bAlt); + \DGS  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?/SIA9VK  
  DDX_Text(pDX, IDC_PATH, m_Path); {5$.:Y  
  DDX_Text(pDX, IDC_NUMBER, m_Number); U1Z.#ETnM  
 //}}AFX_DATA_MAP RO]Vn]qb  
} \R6D'Yt  
3%g\)Cs  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) R43yr+p  
//{{AFX_MSG_MAP(CCaptureDlg) ^hpdre"  
 ON_WM_SYSCOMMAND() aQzu[N  
 ON_WM_PAINT() L*rND15  
 ON_WM_QUERYDRAGICON() *gJ:irah  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) # -0}r  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0&YW#L|J  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^Ia:e ?)W  
//}}AFX_MSG_MAP 3Pj 6(cf  
END_MESSAGE_MAP() A`NkgVq5:  
:z^VI M  
BOOL CCaptureDlg::OnInitDialog() sn4wd:b7%  
{ d^0vaX6e}  
 CDialog::OnInitDialog(); &<s[(w!%%  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); LFi8@  
 ASSERT(IDM_ABOUTBOX < 0xF000); F@76V$U.  
 CMenu* pSysMenu = GetSystemMenu(FALSE); B ``)  
 if (pSysMenu != NULL) :$>Co\D  
 { .??[qBOTE  
  CString strAboutMenu; K KPQ[3g  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #i8] f{  
  if (!strAboutMenu.IsEmpty()) XtJ _po  
  { * mzJ)4A  
   pSysMenu->AppendMenu(MF_SEPARATOR); v(=?ge YLo  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); KqM!7  
  } [SFX;v!9  
 } 9L$bJO-3  
 SetIcon(m_hIcon, TRUE); // Set big icon 8f""@TTp  
 SetIcon(m_hIcon, FALSE); // Set small icon JDQ7  
 m_Key.SetCurSel(0); ot"3 3I  
 RegisterHotkey(); E3):8>R;1  
 CMenu* pMenu=GetSystemMenu(FALSE); gJkk0wok C  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); W'>"E/Tx#O  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yJ\K\\]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *?'^R c  
 return TRUE; // return TRUE unless you set the focus to a control V<ZohB?y  
} K,!"5WrX*  
XS L*e  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9]{(~=D7  
{ , ;'y <GA  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) eQiK\iDS  
 { Gk!06   
  CAboutDlg dlgAbout; $P9'"a)Lm  
  dlgAbout.DoModal(); yX^/Oc@j  
 } Rh[%UNl  
 else _y,? Cj=u|  
 { 8f\sG:$  
  CDialog::OnSysCommand(nID, lParam); X9J&OQ  
 } c v .R`)l  
} 6AM-^S@  
=B0#z]qu  
void CCaptureDlg::OnPaint() -HE@wda  
{ ^ #6Ei9di  
 if (IsIconic()) d".Xp4}f  
 { gPo3jwo$  
  CPaintDC dc(this); // device context for painting =JqKdLH  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7j9X<8 *  
  // Center icon in client rectangle _'W en  
  int cxIcon = GetSystemMetrics(SM_CXICON); J%Cn  
  int cyIcon = GetSystemMetrics(SM_CYICON); @v#]+9F  
  CRect rect;  Uz;z  
  GetClientRect(&rect); Wfw6(L  
  int x = (rect.Width() - cxIcon + 1) / 2; &!kD81?Mm  
  int y = (rect.Height() - cyIcon + 1) / 2; N"tEXb/,  
  // Draw the icon 3gUGfe di  
  dc.DrawIcon(x, y, m_hIcon); BI BBp=+  
 } }m`+E+T4  
 else $CgJ+ua\8  
 { /nbHin#we  
  CDialog::OnPaint(); ^an3&  
 } Gkc.HFn(  
} *dTI4k  
6 lp.0B  
HCURSOR CCaptureDlg::OnQueryDragIcon() qs["&\@  
{ TQor-Cymz  
 return (HCURSOR) m_hIcon; '@{'T LMCi  
} 2feiD?0  
3M?vK(zG>P  
void CCaptureDlg::OnCancel() c]u^0X?&  
{ LD.^.4{c:  
 if(bTray) [m}58?0~x  
  DeleteIcon(); da'7* &/  
  CDialog::OnCancel(); QR.]?t;1  
} dbmty|d  
Y &G]M  
void CCaptureDlg::OnAbout() \Q CH.~]  
{ <b5J"i&m  
 CAboutDlg dlg; ?3I93Bt7  
 dlg.DoModal(); Y[0  
} %[ Z[  
w 2o% {n\L  
void CCaptureDlg::OnBrowse() <0P7NC:Ci  
{ )[w_LHKI  
 CString str; xu]>TC1  
 BROWSEINFO bi; j06Xz\c  
 char name[MAX_PATH]; B%.XWW$  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); I^CKq?V?:  
 bi.hwndOwner=GetSafeHwnd(); K+`$*vS~ws  
 bi.pszDisplayName=name; XOdkfmc+s'  
 bi.lpszTitle="Select folder"; =:4vRq [  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; jkN-(v(T  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); +Kw&XRA d  
 if(idl==NULL) AUan^Om  
  return; -F]0Py8(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); FL,av>mV  
 str.ReleaseBuffer(); l'K3)yQEJ  
 m_Path=str; YFGQPg  
 if(str.GetAt(str.GetLength()-1)!='\\') ~ sC<V  
  m_Path+="\\"; VSxls  
 UpdateData(FALSE); cNd;qO0$  
} 4X()D {uR  
%Ob#GA+  
void CCaptureDlg::SaveBmp() MPn 6sf9M  
{ $69ef[b  
 CDC dc; bnm3 cR:h"  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); lrE|>R  
 CBitmap bm; _YT9zG  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1]yjhw9g  
 int Height=GetSystemMetrics(SM_CYSCREEN); K4H U 9!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); P ]prrKZe,  
 CDC tdc; f`[gRcZ-  
 tdc.CreateCompatibleDC(&dc); KBb{Z;%  
 CBitmap*pOld=tdc.SelectObject(&bm); %+1;iuDL  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _w'N&#  
 tdc.SelectObject(pOld); kY$vPHZpN  
 BITMAP btm; &ND8^lR=Y;  
 bm.GetBitmap(&btm); p5`d@y\hj  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; g4`)n`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <+/:}S4w)  
 BITMAPINFOHEADER bih; qMA K"%x  
 bih.biBitCount=btm.bmBitsPixel; ,rO>5$w.  
 bih.biClrImportant=0; jgkJF[t`  
 bih.biClrUsed=0; #Q6.r.3@x  
 bih.biCompression=0; cc$L56q  
 bih.biHeight=btm.bmHeight; W,g0n=2V  
 bih.biPlanes=1; Gx$rk<;ZW  
 bih.biSize=sizeof(BITMAPINFOHEADER); oD0N<Ln}  
 bih.biSizeImage=size; #U=}Pv~wM  
 bih.biWidth=btm.bmWidth; =$^<@-;  
 bih.biXPelsPerMeter=0; Gp PlO]  
 bih.biYPelsPerMeter=0; ]h`<E~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); k *#fN(_  
 static int filecount=0; z1WF@ Ej  
 CString name; Hf ]w  
 name.Format("pict%04d.bmp",filecount++); {|jrYU.k~  
 name=m_Path+name; IIrXI8'}  
 BITMAPFILEHEADER bfh; '/h~O@Rw  
 bfh.bfReserved1=bfh.bfReserved2=0; S>'S4MJE`  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _kJ?mTk  
 bfh.bfSize=54+size; p?#cn   
 bfh.bfOffBits=54; R24ZjbKL  
 CFile bf; (ohza<X;6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <]/z45?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3 E~d  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3XOf-v:~  
  bf.WriteHuge(lpData,size); VgoN=S  
  bf.Close(); TsX(=N_  
  nCount++; o C5}[cYD`  
 } U'Xw'?Uj  
 GlobalFreePtr(lpData); mp\`9j+{  
 if(nCount==1) hlgBx~S[  
  m_Number.Format("%d picture captured.",nCount); |PI]v`[  
 else z ]d^%>Ef  
  m_Number.Format("%d pictures captured.",nCount); }`SXUM_sD`  
  UpdateData(FALSE); UB4M=R|  
} RgPY,\_9+  
Vd'KN2Jm  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) _;M46o%h  
{ c<(LXf+61  
 if(pMsg -> message == WM_KEYDOWN) t]j4PNzn  
 { @ k`^Z5tN  
  if(pMsg -> wParam == VK_ESCAPE) Dn}Wsd=  
   return TRUE; !JkH$~  
  if(pMsg -> wParam == VK_RETURN) X+: >&&9  
   return TRUE; `D#3  
 } <K#]1xCA  
 return CDialog::PreTranslateMessage(pMsg); [q MFLY$  
} :*{>=BD  
o`!7 ~n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \w]c<gM K  
{ 1o;*`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ e-taBrl;  
  SaveBmp(); kH)JBx.  
  return FALSE; GmA5E  
} mp{r$tc  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ iTt#%Fs)4M  
 CMenu pop; e^Ds|}{V  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); r RfPq  
 CMenu*pMenu=pop.GetSubMenu(0); !*U#,qY  
 pMenu->SetDefaultItem(ID_EXITICON); >-~2:d\M3  
 CPoint pt; 0B4&!J  
 GetCursorPos(&pt); q$;'Fy%oy  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CkJU5D  
 if(id==ID_EXITICON) ${/"u3a_  
  DeleteIcon(); T%Vg0Y)P;  
 else if(id==ID_EXIT) Od>^yhn  
  OnCancel(); bwo{ Lw~  
 return FALSE; " -Ie  
} PR&D67:Jy  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); l<](8oc. w  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) X@ljZ  
 AddIcon(); CQq'x +{F  
 return res; Tz=YSQy$9  
} }x[d]fcC  
Dm3/i |Y  
void CCaptureDlg::AddIcon() 3,snx4q (  
{ pY3N7&m\:  
 NOTIFYICONDATA data; Ozygr?*X  
 data.cbSize=sizeof(NOTIFYICONDATA); ~okIiC]#  
 CString tip; yxECK&&P0#  
 tip.LoadString(IDS_ICONTIP); ) OqQz7'  
 data.hIcon=GetIcon(0); -*?Y4}mK  
 data.hWnd=GetSafeHwnd(); I) $of9   
 strcpy(data.szTip,tip); )P{I<TBI;  
 data.uCallbackMessage=IDM_SHELL; 5>XrNc91  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &zCqF=/9U  
 data.uID=98; 4b"%171  
 Shell_NotifyIcon(NIM_ADD,&data); C~2/ 5  
 ShowWindow(SW_HIDE); T4W"!4[  
 bTray=TRUE; jU#/yM "Y  
} doCWJ   
kXj%thDx  
void CCaptureDlg::DeleteIcon() IZm_/  
{ iwHy!Vi-5  
 NOTIFYICONDATA data; _HT*>-B  
 data.cbSize=sizeof(NOTIFYICONDATA); 0I.9m[<Fc  
 data.hWnd=GetSafeHwnd(); /nK)esB1L  
 data.uID=98; bw@Dc T&,  
 Shell_NotifyIcon(NIM_DELETE,&data); qM`XF32A$  
 ShowWindow(SW_SHOW); _{EO9s2FG  
 SetForegroundWindow(); ez2 gy"  
 ShowWindow(SW_SHOWNORMAL); nP9@yI*7  
 bTray=FALSE; ~YIGOL"?  
} >`jsUeS  
@G vDl=.  
void CCaptureDlg::OnChange() G-U%  
{ |~! R5|Q  
 RegisterHotkey(); CS 7"mE`{  
}  s*gyk  
z.H*"r  
BOOL CCaptureDlg::RegisterHotkey() lR!Sdd} -  
{ \ B~9Ue!  
 UpdateData(); zS Yh ?NB5  
 UCHAR mask=0; LhZWK^!{S  
 UCHAR key=0; /H)K_H#|;  
 if(m_bControl) o W)M&$oS  
  mask|=4; n'/w(o$&  
 if(m_bAlt) :!a9|Fh~  
  mask|=2; :<%q9)aPf`  
 if(m_bShift) n2bL-  
  mask|=1; mm3goIi; Y  
  key=Key_Table[m_Key.GetCurSel()]; n6gYZd  
 if(bRegistered){ S7Xr~5>X  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); qYg4H|6  
  bRegistered=FALSE; vqLC?{i+  
 } d[.kGytUt  
 cMask=mask; 2`#jw)dM;}  
 cKey=key; $'f<4  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); bQ-5uFe~$B  
 return bRegistered; }b9#.H9  
} 8wz4KG3SK  
%h** L'~``  
  四、小结 H|='|k5Y.  
hFw\uETu  
  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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