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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: johmJLC  
  8+L7E-  
  一、实现方法 J2Y 3er  
7n [12:  
  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: @C<d2f|8  
&V FjH W  
#pragma data_seg("shareddata") |Pj9ZG#  
HHOOK hHook =NULL; //钩子句柄 )j(fWshP  
UINT nHookCount =0; //挂接的程序数目 w1.MhA  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 afV P-m4L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 &Ky3Jb<:Gt  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ax;{MfsK  
static int KeyCount =0; T!&jFy*W  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ->Q`'@'|P  
#pragma data_seg() "?`JA7~g  
B[Ix?V4yy  
  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。 kYmo7  
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  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: lbG}noqb  
j& <tdORT  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR d{iL?>'?^  
cKey,UCHAR cMask) +H?<}N*T  
{ QQSH +  
 BOOL bAdded=FALSE; Qlf 9]ug)  
 for(int index=0;index<MAX_KEY;index++){ SAQs {M  
  if(hCallWnd[index]==0){ n8 GF8a  
   hCallWnd[index]=hWnd; L;nZ0)@@l  
   HotKey[index]=cKey; EK:Y2WZ  
   HotKeyMask[index]=cMask; p5D5%B/  
   bAdded=TRUE; IMw "eV  
   KeyCount++; dp33z"<3  
   break; X!2.IsIS8  
  } s&Z35IM8|  
 } p9k4w% ~:  
 return bAdded; e2q pJ4i  
} nq),VPJi  
//删除热键 v hR twi  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ny]'RS-  
{ .Kg|f~InO  
 BOOL bRemoved=FALSE; !~ BZHi6\  
 for(int index=0;index<MAX_KEY;index++){ 2Ti" s-  
  if(hCallWnd[index]==hWnd){ 3"f)*w7d  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V^9$t/c &  
    hCallWnd[index]=NULL; |K'Gw}fX/  
    HotKey[index]=0; ,^n-L&  
    HotKeyMask[index]=0; 3j]UEA^  
    bRemoved=TRUE; Kp$_0  
    KeyCount--; Dl>*L  
    break; :h^O{"au^  
   } [vZfH!vLP  
  } 0~(\lkh*!9  
 } &NlS  =  
 return bRemoved; wxH (&CB-{  
} -B<O_*wOj  
DN4fP-m-  
E~rs11  
  DLL中的钩子函数如下: :5$xh  
)[e%wPu4e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ZTN:|IKT  
{ W\nHX I  
 BOOL bProcessed=FALSE; lNq:JVJ#\r  
 if(HC_ACTION==nCode) 16a_GwfM  
 { E \ K  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 E`A<]dAoK  
   switch(wParam) L"Qh_+   
   {  i5ajM,i/K  
    case VK_MENU: R>/QA RX  
     MaskBits&=~ALTBIT; "$`wk  
     break; D2>hMc  
    case VK_CONTROL: 4.,KEt'H  
     MaskBits&=~CTRLBIT; <K=@-4/Bp  
     break; Eqz4{\   
    case VK_SHIFT: ?|%\<h@;  
     MaskBits&=~SHIFTBIT; TBoM{s=.  
     break; <`oCz Q1  
    default: //judge the key and send message +Q@/F~1@6@  
     break; EX+={U|ua$  
   } x`};{oz;  
   for(int index=0;index<MAX_KEY;index++){ 'd|Q4RE+W  
    if(hCallWnd[index]==NULL) [0mFy) 6  
     continue; ;zfQ3$@9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) < fojX\}3  
    { Fw(b1d>E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O;"*_Xq(`  
     bProcessed=TRUE; ~rVKQ-+4&  
    } &4w\6IR  
   } V6DBKq  
  } XgwMppacw  
  else if((lParam&0xc000ffff)==1){ //有键按下 [u`17hyX  
   switch(wParam) o 2[vM$]  
   { z5|e\Z  
    case VK_MENU: hLDch5J5~  
     MaskBits|=ALTBIT; c+,7Zu!  
     break; x>1iIpBv^  
    case VK_CONTROL: 1YF+(fk  
     MaskBits|=CTRLBIT; 3s+<    
     break; ~8KF<2c   
    case VK_SHIFT: i6!T`Kau  
     MaskBits|=SHIFTBIT; ::3iXk)  
     break; Q:-%3)g<<  
    default: //judge the key and send message Dz"u8 f  
     break; ? 6yF{!F*  
   } 0)6i~MglY  
   for(int index=0;index<MAX_KEY;index++){ IGh !d?D  
    if(hCallWnd[index]==NULL) d- Z+fz  
     continue; Rye ~w6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O<eWq]  
    { I =tyQ`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4 ~MJ4:  
     bProcessed=TRUE; Zq\RNZ}  
    } 2$j Ot}  
   } AHp830\  
  } :{TmR3.  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 lRa 3v Ng  
   for(int index=0;index<MAX_KEY;index++){ c&| '3i+  
    if(hCallWnd[index]==NULL) . BYKdxa  
     continue; d'Ik@D]I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Xh7~MU~X  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); YJ$Vn >6Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +WU|sAK"  
   } IF36K^K  
  } `uM0,Z  
 } 6)uPM"cO  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); KG4#BY&^  
} CN8@c!mB  
3$96+A^M*  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: )JY_eG&2Dx  
(dLE<\E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  &*>C PO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dIBKE0`  
jE?\Yv3  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: *x*,I ,03  
(.@p4q Q-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (_i vN  
{ epG X.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) zDvP7hl  
 { 7T|J[W O  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 'o)ve(  
  SaveBmp(); /IrR,bvA  
  return FALSE; 8XS {6<  
 } AihL>a%  
 …… //其它处理及默认处理 E1{:z"  
} H/p-YtY  
O#Zs3k  
xZ S\#{  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 iXG>j.w{79  
B:6sVJ  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 IQk#  
@sg T[P*ut  
  二、编程步骤 H.l,%x&K  
:EQme0OW  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; v8U1uOR,%  
qUDz(bFk/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; V~J2s  
C\a:eSgaC  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 53,,%Ue  
guUr1Ij  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; xT=kxyu  
eF8 aB?&"  
  5、 添加代码,编译运行程序。 uJ)=+Exii  
f9 l<$l  
三、程序代码 o {Xw Li  
|peMr#  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL z[|PsC3i:  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |0%4G k);  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ $cJN9|$6  
#if _MSC_VER > 1000 avxn}*:X.  
#pragma once $)TF,-#x  
#endif // _MSC_VER > 1000 ExOB P  
#ifndef __AFXWIN_H__ ]"7DV3_  
#error include 'stdafx.h' before including this file for PCH yhkQFB%gv  
#endif _/sf@R  
#include "resource.h" // main symbols CSX$Pk*  
class CHookApp : public CWinApp O"J.k&C<,  
{ H/@M  
 public: ,@'){V  
  CHookApp(); Dt~}9HrU  
  // Overrides QIMv9;  
  // ClassWizard generated virtual function overrides +U_-Lq )  
  //{{AFX_VIRTUAL(CHookApp) \xO2WD  
 public: X!+Mgh6  
  virtual BOOL InitInstance(); 5%Fn^u:  
  virtual int ExitInstance(); ,5A>:2 zs  
  //}}AFX_VIRTUAL "{ QHWZ  
  //{{AFX_MSG(CHookApp) Nh\8+v*+{  
  // NOTE - the ClassWizard will add and remove member functions here. DKVt8/vq  
  // DO NOT EDIT what you see in these blocks of generated code ! ]}l+ !NV<  
  //}}AFX_MSG 4QKE{0NE  
  DECLARE_MESSAGE_MAP() ,m?UFRi  
}; ?_Dnfa_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); #G!Adj+p5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'MdE}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t zW<&^  
BOOL InitHotkey(); iQ]c k-  
BOOL UnInit(); v20I<!5w  
#endif M%5$-;6~_  
g7U:A0Z  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. !NAX6m  
#include "stdafx.h" 7f\^VG  
#include "hook.h" DCt:EhC  
#include <windowsx.h>  > ^v8N  
#ifdef _DEBUG u$%#5_k  
#define new DEBUG_NEW hPeKQwzC0  
#undef THIS_FILE k>0cTBY&  
static char THIS_FILE[] = __FILE__; 55\X\> 0C7  
#endif _6-/S!7Y\  
#define MAX_KEY 100 *UL|{_)c  
#define CTRLBIT 0x04 ^qus `6  
#define ALTBIT 0x02 CMG`'gT  
#define SHIFTBIT 0x01 r4NT`&`g?  
#pragma data_seg("shareddata") 2E ; %=e  
HHOOK hHook =NULL; &9lc\Y4PY  
UINT nHookCount =0; @H# kvYWmn  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4Ig{#}<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @x F8' [<  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey dYqDL<se/I  
static int KeyCount =0;  hL{B9?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift vK.4JOlRF  
#pragma data_seg()   [aS)<^  
HINSTANCE hins; U)/Ul>dY  
void VerifyWindow(); rDx],O _  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) NdSxWrD`m  
//{{AFX_MSG_MAP(CHookApp) '5,,XhP  
// NOTE - the ClassWizard will add and remove mapping macros here. {kRC!}  
// DO NOT EDIT what you see in these blocks of generated code! e "adkV  
//}}AFX_MSG_MAP Z8dN0AqZ  
END_MESSAGE_MAP() ]>4Qs  
(Nlm4*{h  
CHookApp::CHookApp() 'lRHdD}s  
{ _TN$c  
 // TODO: add construction code here, &|{,4V0%A  
 // Place all significant initialization in InitInstance c+)|o!d  
} OYtus7q<  
WZ6{(`;#m  
CHookApp theApp; &'yV:g3H  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <[5${)  
{ \HQb#f,  
 BOOL bProcessed=FALSE; *-!ndbf  
 if(HC_ACTION==nCode) H6JMN1#t$  
 { W>|b98NPu  
  if((lParam&0xc0000000)==0xc0000000){// Key up 3Q~&xNf  
   switch(wParam) P_lcX;O  
   { >T*g'954xF  
    case VK_MENU: n`KXJ?t  
     MaskBits&=~ALTBIT; |AfQ_iT6c  
     break; \\G6c4 fC  
    case VK_CONTROL: g~H? l3v  
     MaskBits&=~CTRLBIT; ~m|?! ]n  
     break; -Us% g  
    case VK_SHIFT: LLHOWD C(2  
     MaskBits&=~SHIFTBIT; T\s#-f[x  
     break; iY'hkrw  
    default: //judge the key and send message }7 z+  
     break; 3cFLU^  
   } 2P=~3g*  
   for(int index=0;index<MAX_KEY;index++){ udy;Odt  
    if(hCallWnd[index]==NULL) tWOze, N  
     continue; KC-aLq/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DJ [#H  
    { j6HbJ#]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); coVT+we  
     bProcessed=TRUE; 8=o(nFJw  
    } :::f,aCAu  
   } uv!qE1z@':  
  } !X <n:J  
  else if((lParam&0xc000ffff)==1){ //Key down _po 4(U&  
   switch(wParam) a4.: i  
   { ~JPzjE  
    case VK_MENU: }o:sx/=u_  
     MaskBits|=ALTBIT; CgKSK0/a  
     break; 1p<?S}zg@  
    case VK_CONTROL: Xgc\O08  
     MaskBits|=CTRLBIT; o5x^"#  
     break; f4I9H0d;!  
    case VK_SHIFT: K$GXXE`  
     MaskBits|=SHIFTBIT; +i!M[  
     break;  +5mkMZ  
    default: //judge the key and send message BvR3Oi@Wc  
     break; "FIx^  
   } =xet+;~ji  
   for(int index=0;index<MAX_KEY;index++) 7 ~8Fs@  
   { 13kb~'+&r  
    if(hCallWnd[index]==NULL) 0U*"OSpF  
     continue; )9Ojvp=#r:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \bSHBTK  
    { qM !q,Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); B :.;:AEbT  
     bProcessed=TRUE; HZ=yfJs nc  
    } R0d|j#vP  
   } rO%+)M$A  
  } oA@^N4PD  
  if(!bProcessed){ .. TjEBp  
   for(int index=0;index<MAX_KEY;index++){ K!gFD  
    if(hCallWnd[index]==NULL) yuX 0Y{:I  
     continue; >G~;2K[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5&@U T  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); e"/X*xA  
   } Tou~U[V+  
  } dS=,. }  
 } LXV6Ew5E  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); dtl<  
} R7E"7"M10  
r1atyK  
BOOL InitHotkey() !{ lb#  
{ >C3 9`1  
 if(hHook!=NULL){ K$]B" s  
  nHookCount++; +]vl8, 4@  
  return TRUE; qJj5J;k  
 } ?3N86Qj  
 else 7HFO-r118  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ]NsaFDi\  
  if(hHook!=NULL) sTyGi1  
   nHookCount++; N *>; '  
  return (hHook!=NULL); i`L66uV  
} .R5z>:A  
BOOL UnInit() 4*X$Jle|  
{ s. [${S6O  
 if(nHookCount>1){ < *OF  
  nHookCount--; D I[Ee?  
  return TRUE; 8t!"K_Mkx  
 } N>Y3[G+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^XVa!s,d  
 if(unhooked==TRUE){ xW~@V)OH  
  nHookCount=0; yr'`~[oSCy  
  hHook=NULL; ,#l oVLy  
 } BW 7[JD  
 return unhooked; a\E]ueVD2j  
} OQvJdjST  
k$!&3Rh  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [~wcHE  
{ b}*hodzF  
 BOOL bAdded=FALSE; ><qE5D[  
 for(int index=0;index<MAX_KEY;index++){ n3\vq3^?  
  if(hCallWnd[index]==0){ yK^k*)2N  
   hCallWnd[index]=hWnd; ,P+&-}gn9  
   HotKey[index]=cKey; ^*OA%wg3=h  
   HotKeyMask[index]=cMask; Nfh(2g K+  
   bAdded=TRUE; C2v7(  
   KeyCount++; \ PqV|  
   break; 3Y8 V?* 1|  
  } Kw|`y %~  
 } VK#zmEiB  
 return bAdded; u 6+  
} x!+ a,+G  
@ 2_&ti  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I_rVeMw=  
{ we9AB_y  
 BOOL bRemoved=FALSE; _G|6xlO  
 for(int index=0;index<MAX_KEY;index++){ MNzq}(p  
  if(hCallWnd[index]==hWnd){ :.,I4>b2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -E1}mL}I`  
    hCallWnd[index]=NULL; 3'wBX  
    HotKey[index]=0; Ih0GzyU*4  
    HotKeyMask[index]=0; QZfnoKz  
    bRemoved=TRUE; MgekLP )&  
    KeyCount--; |Th{*IJ <,  
    break; Lnzhs;7L  
   } 'Vd>"ti  
  } ^BZdR<;  
 } 8 _J:Yg  
 return bRemoved; OZ6%AUot  
} OsXQWSkj~  
tdm /U  
void VerifyWindow() EA\~m*k  
{ 7o<RvM  
 for(int i=0;i<MAX_KEY;i++){ C1J'. !  
  if(hCallWnd!=NULL){ q3:tZoeXV  
   if(!IsWindow(hCallWnd)){ Evc 9k  
    hCallWnd=NULL; 3]i1M%'i  
    HotKey=0; g;pFT  
    HotKeyMask=0; 0U<9=[~q7@  
    KeyCount--; fCKcv |  
   } n!p&.Mt  
  } ]%."  
 } gS%J`X$  
} -l",!sV  
= 4If7  
BOOL CHookApp::InitInstance() w%ForDB>P  
{ Dz?F,g_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); b+3pu\w `  
 hins=AfxGetInstanceHandle(); ^6`U0|5mRX  
 InitHotkey(); <  5ow81  
 return CWinApp::InitInstance(); !q X 7   
} ;8@A7`^  
Ii)TCSt9U?  
int CHookApp::ExitInstance() __QT lj  
{ jHd~yCq  
 VerifyWindow(); .f}I$ "2  
 UnInit(); `{ /tx!  
 return CWinApp::ExitInstance(); fKfi   
} ?}y7S]B FI  
K"pfp !Y  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Pw")|85  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ,MLPVDN*D  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \rpu=*gt  
#if _MSC_VER > 1000 ((y+FJH  
#pragma once `27? f$,  
#endif // _MSC_VER > 1000 +RbCa c  
lBCM; #P  
class CCaptureDlg : public CDialog u!Z&c7kPI  
{ T:si?7CR  
 // Construction ':Te#S  
 public: %>f:m!.  
  BOOL bTray; k: {$M yK  
  BOOL bRegistered; lY~xoHT;[  
  BOOL RegisterHotkey();  6} 9A0  
  UCHAR cKey; o5)U3U1|  
  UCHAR cMask; znM"P|A  
  void DeleteIcon(); QKVZ![Y!s  
  void AddIcon(); ;{>z\6N  
  UINT nCount; (Yx rZ_F'b  
  void SaveBmp(); tDi<n}  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor M?_VYK  
  // Dialog Data $, =n  
  //{{AFX_DATA(CCaptureDlg) x>t:&Y M  
  enum { IDD = IDD_CAPTURE_DIALOG }; c!I> _PD`&  
  CComboBox m_Key; X1+Wb9P  
  BOOL m_bControl; 5!AzEB  
  BOOL m_bAlt; [p]Ayo$~  
  BOOL m_bShift; w_9:gprf  
  CString m_Path; {&/q\UQ  
  CString m_Number; r+) A)a,  
  //}}AFX_DATA c=ZX7U  
  // ClassWizard generated virtual function overrides p<$z!|7m  
  //{{AFX_VIRTUAL(CCaptureDlg) iJq}tIk#2'  
 public: \ Xuu|]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 4Jw0m#UN1  
 protected: ;'nu9FU*O  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H*l8,*M}  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }lWEbQ)(!  
  //}}AFX_VIRTUAL T9u/|OP  
  // Implementation @$Y`I{Xf  
 protected: )(,+o  
  HICON m_hIcon; [ h%ci3  
  // Generated message map functions @v|_APy#  
  //{{AFX_MSG(CCaptureDlg) _pW\F(+8  
  virtual BOOL OnInitDialog(); Y0U:i.)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]{dg"J  
  afx_msg void OnPaint(); 3pm;?6i6  
  afx_msg HCURSOR OnQueryDragIcon(); #VD[\#  
  virtual void OnCancel(); )V+ ;7j<"D  
  afx_msg void OnAbout(); pnDD9u-4;  
  afx_msg void OnBrowse(); is`le}$^y  
  afx_msg void OnChange(); voCQ_~*)9  
 //}}AFX_MSG J}lBK P:-*  
 DECLARE_MESSAGE_MAP() g3j@o/Y  
}; /)6<`S(  
#endif entO"~*EX  
p.&FK'&[0  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Vhv<w O Ct  
#include "stdafx.h" ^O4.$4t|  
#include "Capture.h" r=<,`_@Y  
#include "CaptureDlg.h" Q+gQ"l,95  
#include <windowsx.h> &R>x;&Gj  
#pragma comment(lib,"hook.lib") G[)QGZ}8b  
#ifdef _DEBUG b?qtTce  
#define new DEBUG_NEW 7zT]\AnO  
#undef THIS_FILE G^5}T>TV  
static char THIS_FILE[] = __FILE__; ho;Km  
#endif O0c#-K.f  
#define IDM_SHELL WM_USER+1 o|(-0mWBQA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Il>!C\hU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h@t&n@8O?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; UVA|(:  
class CAboutDlg : public CDialog ;)~loa1\  
{ T)qD}hl  
 public: O8r9&Nv  
  CAboutDlg(); v|"Nx42  
  // Dialog Data -(ABQgSO]  
  //{{AFX_DATA(CAboutDlg) ZFY t[:  
  enum { IDD = IDD_ABOUTBOX }; :6./yj(  
  //}}AFX_DATA s -~Tf|  
  // ClassWizard generated virtual function overrides :"|}oKT%mP  
  //{{AFX_VIRTUAL(CAboutDlg) &AG,]#  
 protected: Y FL9Q<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =i4Ds  
  //}}AFX_VIRTUAL ;gu_/[P  
  // Implementation 4&2aJ_ 2 y  
 protected: Yc BY[i0  
  //{{AFX_MSG(CAboutDlg) 5\A[ra  
  //}}AFX_MSG HE,# pj(D  
  DECLARE_MESSAGE_MAP() .'saUcVg:  
}; H~^am  
MD%_Z/NL  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) k,LeBCqGcb  
{ 8A~5@  
 //{{AFX_DATA_INIT(CAboutDlg) al.~[T-O+  
 //}}AFX_DATA_INIT pdX%TrM+[:  
} 3M=ym.  
l\vtz5L  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /pt%*;H  
{ {L$]NQdz  
 CDialog::DoDataExchange(pDX); >jD,%yG  
 //{{AFX_DATA_MAP(CAboutDlg) n [H3b}  
 //}}AFX_DATA_MAP . T6fPEb  
} ( 6|S42  
wu "6Kyu  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) T0J"Wr>WY  
 //{{AFX_MSG_MAP(CAboutDlg) ;I1}g]  
 // No message handlers BFmd`#{l  
 //}}AFX_MSG_MAP gJ6 C&8tl  
END_MESSAGE_MAP() a;jXMR  
:Y`cgi0vkd  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~3< Li}W  
: CDialog(CCaptureDlg::IDD, pParent) }J"}5O2,b  
{ TR/'L!EE  
 //{{AFX_DATA_INIT(CCaptureDlg) O:cta/M  
  m_bControl = FALSE; gs wp:82e2  
  m_bAlt = FALSE; JY8wo5H  
  m_bShift = FALSE; @5+ JXD  
  m_Path = _T("c:\\"); +`O8cHx  
  m_Number = _T("0 picture captured."); }YH@T]O}  
  nCount=0; ;$gZ?&  
  bRegistered=FALSE; KLK '_)|CT  
  bTray=FALSE; !{tkv4  
 //}}AFX_DATA_INIT a<9cj@h  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 |d\ rCq >  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); eJFGgJRIvF  
} !4cO]wh5  
lL_M=td8W  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3#o!K  
{ G?e"A0,  
 CDialog::DoDataExchange(pDX); @|kBc.(]  
 //{{AFX_DATA_MAP(CCaptureDlg) ihivJ Z  
  DDX_Control(pDX, IDC_KEY, m_Key); -7\Rl3c  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ,b!!h]t  
  DDX_Check(pDX, IDC_ALT, m_bAlt); wN1%;~?7  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); h >V8YJ  
  DDX_Text(pDX, IDC_PATH, m_Path); <$!^LKKzA  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2]W"sT[  
 //}}AFX_DATA_MAP HPJ\]HV(  
} oo sbf#V  
wG6@. ;3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) JQ|qg\[  
//{{AFX_MSG_MAP(CCaptureDlg) uJ ;7]  
 ON_WM_SYSCOMMAND() YYfX@`\  
 ON_WM_PAINT() ^~~&[wY  
 ON_WM_QUERYDRAGICON() &E|2-)  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) p},6W,f  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }G&#pw2  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^RkHdA  
//}}AFX_MSG_MAP (_ov _3  
END_MESSAGE_MAP() *AXu_^^  
S~vbISl  
BOOL CCaptureDlg::OnInitDialog() qF6YH  
{ fys@%PZq  
 CDialog::OnInitDialog(); P,RCbPC4  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *BVkviqxz  
 ASSERT(IDM_ABOUTBOX < 0xF000); e,Xvt5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); `>RJ*_aKEI  
 if (pSysMenu != NULL) p#.B Fy  
 { rtDm<aUh  
  CString strAboutMenu; HZ=Dd4!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &0TOJ:RP  
  if (!strAboutMenu.IsEmpty()) Cog Lo&.  
  { 7\^b+*  
   pSysMenu->AppendMenu(MF_SEPARATOR); t~p9iGX<  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); sSOI5W3A  
  } o_U=]mEDY  
 } io cr  
 SetIcon(m_hIcon, TRUE); // Set big icon q=bJ9iJsq  
 SetIcon(m_hIcon, FALSE); // Set small icon oypq3V=5  
 m_Key.SetCurSel(0); ^`YSl*:  
 RegisterHotkey(); 2U>1-p&dn  
 CMenu* pMenu=GetSystemMenu(FALSE); ? $pGG  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); xpFu$2T6P.  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); c@ En4[a'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); dT,X8 "  
 return TRUE; // return TRUE unless you set the focus to a control X =S;8=N  
} Mim 9C]h(  
j3`:;'L  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 4'+/R%jk"  
{ n5UcivyX  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }<FBcc(n  
 { 8c+i+gp!  
  CAboutDlg dlgAbout; S~YrXQ{_>-  
  dlgAbout.DoModal(); 30FYq?  
 } N3vk<sr@  
 else ]9zc[_ !  
 { MnKEZ: 2  
  CDialog::OnSysCommand(nID, lParam); z^~uq:  
 } 2|EH Ny!  
} T>n,@?#K  
8XX ,(k_b  
void CCaptureDlg::OnPaint() S?hM  
{ 3z&,>CEX  
 if (IsIconic()) E_WiQ?p   
 { ,2H5CFX/  
  CPaintDC dc(this); // device context for painting wi*Ke2YKP  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QwOQS %  
  // Center icon in client rectangle %~Nf,  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,PRM(n-  
  int cyIcon = GetSystemMetrics(SM_CYICON); yuFuYo&[?v  
  CRect rect; f(D?g  
  GetClientRect(&rect); 3m7$$ N|  
  int x = (rect.Width() - cxIcon + 1) / 2; 9]NsWd^^  
  int y = (rect.Height() - cyIcon + 1) / 2; H W.S~eLw*  
  // Draw the icon 'r1&zw(  
  dc.DrawIcon(x, y, m_hIcon); a;*&q/{o  
 } s.zH.q,  
 else aeSy, :  
 { n0Ze9W+<  
  CDialog::OnPaint(); XZp(Po:H  
 } EF)kYz!@  
} \iowAo$  
%l: %c  
HCURSOR CCaptureDlg::OnQueryDragIcon() 8qS)j1.!  
{ wZfR>|f  
 return (HCURSOR) m_hIcon; ` mCcD  
} ~Gwn||g78  
webT  
void CCaptureDlg::OnCancel() (CZRX9TT1  
{ -iH/~a  
 if(bTray) .V/TVz!b  
  DeleteIcon(); ;=h^"et  
  CDialog::OnCancel(); & NOKrN~HX  
} kP8Ypw&  
i9.5 2  
void CCaptureDlg::OnAbout() )%,bog(x  
{ k(VA5upCs  
 CAboutDlg dlg; xO?~@5  
 dlg.DoModal(); .6vQWt7@  
} D eXnE$XH  
IUu[`\b=  
void CCaptureDlg::OnBrowse() NO* 1km[#  
{ s/,St!A 4!  
 CString str; h+Dg"j<[  
 BROWSEINFO bi; ,T&B.'cq  
 char name[MAX_PATH]; ;Rwr5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); b;x^>(It  
 bi.hwndOwner=GetSafeHwnd(); uv_*E`pN~  
 bi.pszDisplayName=name; ZB ~D_S  
 bi.lpszTitle="Select folder"; 5vP*oD  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; <'GI<Hc  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q3oVl^q  
 if(idl==NULL) |n6nRE wW  
  return; 2]> s@?[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); M}%0=VCY7  
 str.ReleaseBuffer(); FirmzB Il5  
 m_Path=str; CiPD+I  
 if(str.GetAt(str.GetLength()-1)!='\\') X0U{9zP  
  m_Path+="\\"; 5jYRIvM[Q~  
 UpdateData(FALSE); ^$x^JM ]/  
} F*I{?NRN1  
#;^.&2Lt  
void CCaptureDlg::SaveBmp() z ^a,7}4  
{ Ko -<4wu  
 CDC dc; ] YQ*mvI]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); *;o=hM)Tp  
 CBitmap bm; #Va@4<4r  
 int Width=GetSystemMetrics(SM_CXSCREEN); &1B)mj  
 int Height=GetSystemMetrics(SM_CYSCREEN); >_&+gn${  
 bm.CreateCompatibleBitmap(&dc,Width,Height); OkFq>;{a  
 CDC tdc; ^PWZ1.T  
 tdc.CreateCompatibleDC(&dc); DQ'+,bxk=9  
 CBitmap*pOld=tdc.SelectObject(&bm); M%B]f2C  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); t3bDi/m  
 tdc.SelectObject(pOld); <'B`b  
 BITMAP btm; 7i/?+|  
 bm.GetBitmap(&btm); KWN&nP +  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;J?!D x  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); YjG0: 9  
 BITMAPINFOHEADER bih; b5H[~8mf  
 bih.biBitCount=btm.bmBitsPixel; 4Q3Q.(  
 bih.biClrImportant=0; Re.fS6y$>  
 bih.biClrUsed=0; e@X~F6nP  
 bih.biCompression=0; VMtR4!:q  
 bih.biHeight=btm.bmHeight; }b,a*4pN  
 bih.biPlanes=1; ~8|$KD4I  
 bih.biSize=sizeof(BITMAPINFOHEADER); u2U@Qrs2  
 bih.biSizeImage=size; $'[( DwLS  
 bih.biWidth=btm.bmWidth; 8qBw;A)  
 bih.biXPelsPerMeter=0; oA42?I ^  
 bih.biYPelsPerMeter=0; Z/ThY bk  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); VDQ&Bm JE  
 static int filecount=0; tpCEWdn5  
 CString name; %*r P d>*  
 name.Format("pict%04d.bmp",filecount++); TYLf..i<  
 name=m_Path+name; (S(=WG  
 BITMAPFILEHEADER bfh;  ExnszFX*  
 bfh.bfReserved1=bfh.bfReserved2=0; (D~mmffY1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); iAXx`>}m  
 bfh.bfSize=54+size; E2dSOZS:)%  
 bfh.bfOffBits=54; n287@Y4Ru  
 CFile bf; o]k[l ;  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8@Y@5)Oc  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 12k)Ek9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @c.QrKSaD  
  bf.WriteHuge(lpData,size); P3N f<  
  bf.Close();   (+Er  
  nCount++; ,,,5pCi\  
 } OO\UF6MCU  
 GlobalFreePtr(lpData); =8<SKY&\X  
 if(nCount==1) G.(9I~!  
  m_Number.Format("%d picture captured.",nCount); 9N-mIGJ  
 else r2H]n.MT  
  m_Number.Format("%d pictures captured.",nCount); Lqz}h-Ei  
  UpdateData(FALSE); 6%:'2;xM  
} C0kwI*)  
Y.&z$+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &uk?1Z#j  
{ s<^UAdLnl  
 if(pMsg -> message == WM_KEYDOWN) B%r)~?6DM  
 { 6idYz"P %  
  if(pMsg -> wParam == VK_ESCAPE) 2"%d!"  
   return TRUE; !q$IB?8   
  if(pMsg -> wParam == VK_RETURN) znu?x|mV  
   return TRUE; dyu~T{  
 } AMtFOXx%I  
 return CDialog::PreTranslateMessage(pMsg); Aja'`Mu  
} u6|7P<HUfb  
(\SxG\`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t1Cyyb  
{ )8P<ZtEU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3B;B#0g50  
  SaveBmp(); N!HiQ  
  return FALSE; v`no dI  
} bC"#.e  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ w'cZ\<N[  
 CMenu pop; PBkKn3P3  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); -LQ%)'J ZN  
 CMenu*pMenu=pop.GetSubMenu(0); |-Y,:sY:  
 pMenu->SetDefaultItem(ID_EXITICON); ?;}2 Z)  
 CPoint pt; -S9$C*t  
 GetCursorPos(&pt); lgre@M]mg  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .K:>`~<)  
 if(id==ID_EXITICON) (}c}=V  
  DeleteIcon(); -_A0<A.  
 else if(id==ID_EXIT) v')T^b F@  
  OnCancel(); C2bN<K  
 return FALSE; |8V+(Vzl  
} _H@S(!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); P>jlFm  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *`mwm:4  
 AddIcon(); i wK,XnIR  
 return res; o^5xCK:Oi2  
} C\ 9eR  
9<,\ +}^{  
void CCaptureDlg::AddIcon() M(SH3~  
{ \>M3E  
 NOTIFYICONDATA data; eV}Ow`~I5  
 data.cbSize=sizeof(NOTIFYICONDATA); i!sKL%z}  
 CString tip; q=g;TAXZl  
 tip.LoadString(IDS_ICONTIP); ~eE2!/%9  
 data.hIcon=GetIcon(0); sIg{a( 1/  
 data.hWnd=GetSafeHwnd(); 8 w^i  
 strcpy(data.szTip,tip); dN;C-XF3s  
 data.uCallbackMessage=IDM_SHELL; :\gdQG  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #L[Atx  
 data.uID=98; wVV'9pw}  
 Shell_NotifyIcon(NIM_ADD,&data); So,EPB+  
 ShowWindow(SW_HIDE); k q_B5L?  
 bTray=TRUE; 2Vt iL^;5  
} ~B|K]&/]  
8T7[/"hi\  
void CCaptureDlg::DeleteIcon() 7n}J}8Y*U2  
{ WXaLKiA*(  
 NOTIFYICONDATA data; - =QA{n  
 data.cbSize=sizeof(NOTIFYICONDATA); O~l WFaW  
 data.hWnd=GetSafeHwnd(); jt=mK ,%  
 data.uID=98; Z[Uz~W6M]  
 Shell_NotifyIcon(NIM_DELETE,&data); U''/y\Z  
 ShowWindow(SW_SHOW); Ftu4 V*lD  
 SetForegroundWindow(); _}{C?611c  
 ShowWindow(SW_SHOWNORMAL); fPa FL}&  
 bTray=FALSE; Ryr2  
} Z^>{bW  
kk )9!7  
void CCaptureDlg::OnChange() [*]&U6\j  
{ 349W0>eOT  
 RegisterHotkey(); ,*wa#[  
} N>xs@_"o  
$wub)^  
BOOL CCaptureDlg::RegisterHotkey() fiES6VL  
{ I Bo)fE\O  
 UpdateData(); e4j:IK>  
 UCHAR mask=0; edx-R-Dc-1  
 UCHAR key=0; w0q.cj@nd  
 if(m_bControl) ,n-M!y  
  mask|=4; f{t5r  
 if(m_bAlt) =hjff/ X  
  mask|=2; ~jQ|X?tR  
 if(m_bShift) Akb#1Ww4  
  mask|=1; DwMq  
  key=Key_Table[m_Key.GetCurSel()]; ,Hlbl}.ls  
 if(bRegistered){ a;r,*zZ="  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); s9>-Q"(y  
  bRegistered=FALSE; &O/;YGEAB  
 } I'Ui` :A  
 cMask=mask; 9o@5:.b<j  
 cKey=key; :D\M.A  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \_bk+}WJ]s  
 return bRegistered; k2(B{x}L  
} S8(Y+jgk;a  
(J I4ibP  
  四、小结 z/dpnGX  
W|XW2`3p  
  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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