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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: '@dk3:3t  
  x,M8NTb*  
  一、实现方法 _?v&\j  
8@,8j!$8G  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: )}lO%B'K  
<%?!3 n*  
#pragma data_seg("shareddata") -BcnJK0  
HHOOK hHook =NULL; //钩子句柄 7!/!a*zg  
UINT nHookCount =0; //挂接的程序数目 /(8"9Sfm  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 OF/hD2V  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 U%)-_ *`z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey D6,Ol4d  
static int KeyCount =0; P:%r3F  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 oy\U\#k   
#pragma data_seg() %>- ?oor  
7:e5l19 uI  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Y1G/1Z# 2  
IoZ _zz0  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: lk.Mc6)  
B$ jX%e{:S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR J p)I9k,Ez  
cKey,UCHAR cMask) |[!7^tU*  
{ xX.kKEo"d  
 BOOL bAdded=FALSE; 4s 6,`-  
 for(int index=0;index<MAX_KEY;index++){ S!66t?vHB  
  if(hCallWnd[index]==0){ E V@yJ]  
   hCallWnd[index]=hWnd; I,W `s  
   HotKey[index]=cKey; dkg| kw'  
   HotKeyMask[index]=cMask; uCoy~kt292  
   bAdded=TRUE; ny:/a  
   KeyCount++; RTr"#[  
   break; I]a [Ngj  
  } f7/M_sx  
 } OlP1Zd/l  
 return bAdded; q $PO. #  
} {F;"m&3Lt  
//删除热键 {r%T_BfY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n0Qp:_2z  
{ &v#pS!UOj  
 BOOL bRemoved=FALSE; f2u4*X E\  
 for(int index=0;index<MAX_KEY;index++){ g@Pq<   
  if(hCallWnd[index]==hWnd){ Y`."=8R~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ P9W?sPnC5  
    hCallWnd[index]=NULL; t;`ULp~&  
    HotKey[index]=0; /ke[nr  
    HotKeyMask[index]=0; Z7>Nd$E{  
    bRemoved=TRUE; g}d[j I9  
    KeyCount--; 3wg1wl|  
    break; 6O_l;A[=1  
   } NOmFQ)/ &  
  } nNf*Q r%Z  
 } *7w!~mn[m  
 return bRemoved; aNBwb9X  
} B=~uJUr  
=b, m3 1  
0g9y4z{H  
  DLL中的钩子函数如下: Xk!wT2;  
\-SC-c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %C_c%3d  
{ kbo9nY1k g  
 BOOL bProcessed=FALSE; Hb/8X !=  
 if(HC_ACTION==nCode) nk;^sq4M:  
 { a$\ Bt_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 H@b4(6  
   switch(wParam) nok-![  
   {  "'C5B>qO  
    case VK_MENU: 9h/Hy aN  
     MaskBits&=~ALTBIT; .>Qa3,v5  
     break; 3m$ck$  
    case VK_CONTROL: [8Fn0A  
     MaskBits&=~CTRLBIT; ?aI. Z+#  
     break; M:dH>  
    case VK_SHIFT: !f]kTs]j~  
     MaskBits&=~SHIFTBIT; BS ]:w(}[  
     break; Lrmhr3 w5  
    default: //judge the key and send message `"o{MaFA  
     break; virt[5w  
   } (\'$$  
   for(int index=0;index<MAX_KEY;index++){ zp5ZZcj_  
    if(hCallWnd[index]==NULL) ZL:SJ,C  
     continue; e]5NA?2j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^$X|Lq  
    { {u+=K-Bj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [ . }Uzx  
     bProcessed=TRUE; xz, o Mlw  
    } m>RtKCtP  
   } `X)A$lLr  
  } [b_qC'K[  
  else if((lParam&0xc000ffff)==1){ //有键按下 o+.ySSBl+  
   switch(wParam) `F]  
   { 0 vYG#S  
    case VK_MENU: i[ >U#5  
     MaskBits|=ALTBIT; `sDLxgwI  
     break; 2j#Dwa(lZQ  
    case VK_CONTROL: U#&+n-npO  
     MaskBits|=CTRLBIT; 4oL .Bt  
     break; OL%}C*Zq  
    case VK_SHIFT: 4H NaE{O4  
     MaskBits|=SHIFTBIT; B]vR=F}*  
     break; *;xGH  
    default: //judge the key and send message 3@:O1i  
     break; #SG.`J<%  
   } dS\!tdHP-Q  
   for(int index=0;index<MAX_KEY;index++){ -2(?O`tZ  
    if(hCallWnd[index]==NULL) IMBjI#\  
     continue; R1/c@HQw?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =XK}eQ_d  
    { i"x V=.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,FXc_BCx4  
     bProcessed=TRUE; !zvOCAb,  
    } K|l}+:k  
   } *[m:4\  
  } y/:%S2za>  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 d!4TwpIgx  
   for(int index=0;index<MAX_KEY;index++){ (z8 ;J> 7  
    if(hCallWnd[index]==NULL) R7K`9 c1f6  
     continue; Fq_>}k@fI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !XM<`H/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #oR`_Dm)P  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 \XYidj  
   } )2#&l  
  } 2r ;h">  
 } ca3SE^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q"6$#o{~U  
} IUDH"~f  
~Uey'Xz  
  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: ijUu{PG`X  
tTF<DD}8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <h;_:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `<g6^P  
rS+) )!  
  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: {M7`"+~w  
a+\<2NXYD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D9NQ3[R 9  
{ >MSK.SNh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) >*opEI+  
 { Qc)i?Z'6  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Dy>6L79G  
  SaveBmp(); Jm#p!G+  
  return FALSE; c~O Lr  
 } TUz4-Pd  
 …… //其它处理及默认处理 M@P%k`6C  
} {Z7ixc523  
$(+xhn(O  
K0>+-p oL  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 8 aIqc  
 S,ea[$_  
  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。 /}J_2  
Qe\vx1GRLH  
  二、编程步骤 *W 2)!C|  
4(VV@:_%  
  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"; Kh[l};/F  
Z^z{, u;!  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; LMx/0  
rfYa<M Qc  
  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; B :S8{  
'RhS%l  
  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; dQZdL4  
 <7SE|  
  5、 添加代码,编译运行程序。 ('Qq"cn#  
~]QQaP  
三、程序代码 L\UGC%]9  
"]kzt ux  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &P>& T  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !02y'JS1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ hc[J,yG  
#if _MSC_VER > 1000 '|Bk}pl7  
#pragma once :Yn.Wv-  
#endif // _MSC_VER > 1000 6i~|<vcSP  
#ifndef __AFXWIN_H__ /9&!u )+  
#error include 'stdafx.h' before including this file for PCH l@* $C&E  
#endif :" Otsb7  
#include "resource.h" // main symbols s]O Z+^Z  
class CHookApp : public CWinApp rks"y&&Nc  
{ ( H&HSs  
 public: 4x(m.u@  
  CHookApp(); z-b78A/8  
  // Overrides 8a`3eM~?[  
  // ClassWizard generated virtual function overrides  J]XLWAM  
  //{{AFX_VIRTUAL(CHookApp) -j]c(Q MA]  
 public: `B4Ilh"d  
  virtual BOOL InitInstance(); H#D:'B j29  
  virtual int ExitInstance(); ,zr9*t  
  //}}AFX_VIRTUAL 7M7Lj0Y)L  
  //{{AFX_MSG(CHookApp) 8/(}Wet  
  // NOTE - the ClassWizard will add and remove member functions here. >l><d!hw  
  // DO NOT EDIT what you see in these blocks of generated code ! wdfbl_`T  
  //}}AFX_MSG iQ(j_i'+!I  
  DECLARE_MESSAGE_MAP() _pZ <  
}; A[^#8evaK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); dor1(@no|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |LZ{kD|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G+Z ,i c  
BOOL InitHotkey(); ,Yx<"2 W  
BOOL UnInit(); #b;k+<n[X  
#endif mRRZ/m?A(  
E;{CoL  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |h 6!bt!=  
#include "stdafx.h" vA!IcDP"  
#include "hook.h" :Ae#+([V  
#include <windowsx.h> `^[Tu 1  
#ifdef _DEBUG {<@ud0A:\  
#define new DEBUG_NEW JDZuT#  
#undef THIS_FILE ^67}&O^1 ,  
static char THIS_FILE[] = __FILE__; l0`bseN <  
#endif 0m]QQGvJ{  
#define MAX_KEY 100 F~fBr  
#define CTRLBIT 0x04 T9& {s-3*  
#define ALTBIT 0x02 WZn;u3,R  
#define SHIFTBIT 0x01 ;Ivv4u  
#pragma data_seg("shareddata") %(p9AE  
HHOOK hHook =NULL; `ovMfL.u  
UINT nHookCount =0; KJ32L  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Q"D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT tc[Ld#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )W p7e51  
static int KeyCount =0; } % Ie  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 89^g$ ac  
#pragma data_seg() pTG[F  
HINSTANCE hins; ^.iRU'{  
void VerifyWindow(); RV_I&HD!  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 2( 0%{*m  
//{{AFX_MSG_MAP(CHookApp) 1E / G+pm  
// NOTE - the ClassWizard will add and remove mapping macros here. qpjZ-[UC  
// DO NOT EDIT what you see in these blocks of generated code! U m\HX6  
//}}AFX_MSG_MAP MnqT?Cc4$j  
END_MESSAGE_MAP() _q#pEv  
EjFpQ|-L|  
CHookApp::CHookApp() Vm\zLWNB  
{ ukEJD3i  
 // TODO: add construction code here, ;lb  
 // Place all significant initialization in InitInstance PNo:[9`S;m  
} =E]tEi  
- K?lhu  
CHookApp theApp; ^*`#+*C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Jh=.}FXnjL  
{ xtD(tiqh.;  
 BOOL bProcessed=FALSE; T=u"y;&L  
 if(HC_ACTION==nCode) ]  &"`  
 { }(!Uq  
  if((lParam&0xc0000000)==0xc0000000){// Key up qMVuFw Phi  
   switch(wParam) yOQae m^O  
   { gAorb\iJ  
    case VK_MENU: iYvzZ7 8f  
     MaskBits&=~ALTBIT; %m f)BC  
     break; {+_p?8X  
    case VK_CONTROL: 8g!79q\c4  
     MaskBits&=~CTRLBIT; ~mt{j7  
     break; 48^C+#Jbc  
    case VK_SHIFT: r'#!w3*Cy  
     MaskBits&=~SHIFTBIT; O.X;w<F/V  
     break; u28$V]  
    default: //judge the key and send message \3^V-/SJf  
     break; aV|V C $  
   } cL*oO@I&_  
   for(int index=0;index<MAX_KEY;index++){ 9#P~cW?  
    if(hCallWnd[index]==NULL) y7:f^4  
     continue; K/Yeh<_&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ![ce }  
    { y[.lfW?)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 467"pqT  
     bProcessed=TRUE; UakVmVN/P  
    } )#M$ov  
   } )#i"hnYpQ  
  } %i3[x.M  
  else if((lParam&0xc000ffff)==1){ //Key down %.f%Q?P  
   switch(wParam) X$ \CC18  
   { 8%u|[Si;  
    case VK_MENU: +C7E]0!r  
     MaskBits|=ALTBIT; 0nCiN;sA  
     break; 2e1%L,y{W  
    case VK_CONTROL: YYFS ({  
     MaskBits|=CTRLBIT; Cq/u$G  
     break; n:wAxU  
    case VK_SHIFT: _;5zA"~c#@  
     MaskBits|=SHIFTBIT; q?mpvpL G  
     break; eq%cRd]u  
    default: //judge the key and send message xS%&l)dT  
     break; IoJI|lP  
   } O>h h  
   for(int index=0;index<MAX_KEY;index++) 0lniu=xmQ-  
   { ~D}fy  
    if(hCallWnd[index]==NULL) C}<e3BXc  
     continue; D=z="p\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]!sCWR  
    { $mKExW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]!^wB 3j  
     bProcessed=TRUE; "@ ^<~bw  
    } +,YK}?e  
   } NY<qoV  
  } ktynIN  
  if(!bProcessed){ am3.Dt2\  
   for(int index=0;index<MAX_KEY;index++){ h>*3i#  
    if(hCallWnd[index]==NULL) uwI"V|g%a&  
     continue; $rk=#;6]v;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !ck~4~J  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D :j5/ *  
   } qzORv  
  } Tim/7*vx  
 } !m~r0M7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %pOxt<  
} 9#1?Pt^{<  
^ op0" #B  
BOOL InitHotkey() HU/4K7e`  
{ &L?]w=*  
 if(hHook!=NULL){ eP:\\; ;  
  nHookCount++; l$j~p=S$F  
  return TRUE; X6Z/xb@  
 } g|| q 3  
 else cE`qfz  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); YKU|D32  
  if(hHook!=NULL) $-pijBiz_  
   nHookCount++; x 2&5zp  
  return (hHook!=NULL); +924_,zF  
} "2-D[rYZ  
BOOL UnInit() Z]{=Jy !F  
{ mDp8JNJNE  
 if(nHookCount>1){ { g[kn^|  
  nHookCount--; ._j?1Fw`  
  return TRUE; |P& \C8h  
 } f,6V#,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); <>$CYTb  
 if(unhooked==TRUE){ @>$qb|j  
  nHookCount=0; :%AEwRZ  
  hHook=NULL; p ]jLs|tat  
 } Y=Ic<WHR  
 return unhooked; ^fO9oPM|  
} KwaxNb5  
ztHx) !  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }BT0dKx  
{ ](n)bF+ym  
 BOOL bAdded=FALSE; !PeSnO  
 for(int index=0;index<MAX_KEY;index++){ qhTVsZ:{C  
  if(hCallWnd[index]==0){  _}JMBIq$  
   hCallWnd[index]=hWnd; T YR \K  
   HotKey[index]=cKey; 9^H.[t  
   HotKeyMask[index]=cMask; h,&{m*q&  
   bAdded=TRUE; 4Ng:7C2  
   KeyCount++; jHE^d<=O^  
   break; z#`Qfvu6Hi  
  } B>cT <B  
 } l+&DBw[  
 return bAdded; Zw{?^6;cS  
} #/H2p`5  
j -"34  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z Q*hrgQ  
{ e, 2/3jO  
 BOOL bRemoved=FALSE; YZ:C9:S6X  
 for(int index=0;index<MAX_KEY;index++){ m}D;=>2$  
  if(hCallWnd[index]==hWnd){ G `3{Q7k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {0a\<l  
    hCallWnd[index]=NULL; Vh=U/{Rp1  
    HotKey[index]=0; Ylu\]pr9|C  
    HotKeyMask[index]=0; 8BZ&-j{  
    bRemoved=TRUE; ^jRX6  
    KeyCount--; yDZm)|<.  
    break; noz1W ]  
   } Y d~J(  
  } Q1yXdw  
 } | X#!5u  
 return bRemoved; ^ZS!1%1  
} X}x\n\Z  
8EdaxeDq  
void VerifyWindow()  tKh  
{ Sa@'?ApH  
 for(int i=0;i<MAX_KEY;i++){ `x>6Wk1  
  if(hCallWnd!=NULL){ B6Ajcfy  
   if(!IsWindow(hCallWnd)){ q o^mp  
    hCallWnd=NULL; 2,g4yXws5  
    HotKey=0; !J@!2S 9  
    HotKeyMask=0; <z#Fj`2{  
    KeyCount--; biw . ~  
   } o6~JAvw  
  } PP!-*~F0Jr  
 } y4IQa.F  
} 9MI9$s2y  
 CDuA2e  
BOOL CHookApp::InitInstance() :Ru8Nm  
{ s>\^dtG7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); EVaHb;  
 hins=AfxGetInstanceHandle(); C'gv#!Q  
 InitHotkey(); yVGf[ ~X  
 return CWinApp::InitInstance(); W|zPV`  
} #QcRN?s  
{ m{nCl)y  
int CHookApp::ExitInstance() i_r708ep6  
{ `T1bY9O.  
 VerifyWindow(); tk h *su  
 UnInit(); < Mu`,Kv*  
 return CWinApp::ExitInstance(); gdqBT]j  
} kFmtE dhsc  
LA 2/<:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file P,-5af*;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) uCuB>x&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ cbm;45 L|  
#if _MSC_VER > 1000 6H  U*,  
#pragma once ~Sm6{L  
#endif // _MSC_VER > 1000 V'Kied+  
\.H9e/vU`  
class CCaptureDlg : public CDialog ,tyPZR_  
{ GGcODjY>  
 // Construction b30Jr2[  
 public: $)9|"q6  
  BOOL bTray; k_1@?&3  
  BOOL bRegistered; #wRhR>6  
  BOOL RegisterHotkey(); 5%fWX'mS  
  UCHAR cKey; Qf ~$9?z  
  UCHAR cMask; N#e9w3Rli  
  void DeleteIcon(); ~UO}PI`C  
  void AddIcon(); :@-yK8q's  
  UINT nCount; m$v >r\*X  
  void SaveBmp(); +5Dc5Bl  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor zP2X}VLMo  
  // Dialog Data zYY]+)k?  
  //{{AFX_DATA(CCaptureDlg) G?XA",AC  
  enum { IDD = IDD_CAPTURE_DIALOG }; Mb\(52`)Q  
  CComboBox m_Key; ,>kVVpu  
  BOOL m_bControl; Ng W"wh  
  BOOL m_bAlt; 0hGmOUO  
  BOOL m_bShift; U Xpp1/d|e  
  CString m_Path; vF'>?O?  
  CString m_Number; ;sAGTq  
  //}}AFX_DATA wik<# ke  
  // ClassWizard generated virtual function overrides oS9Od8  
  //{{AFX_VIRTUAL(CCaptureDlg) ~ @xPoD&  
 public: 4\v &8">LL  
  virtual BOOL PreTranslateMessage(MSG* pMsg); `Z5dRLrd  
 protected: mR XR uK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x`@`y7(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $)o0{HsL+  
  //}}AFX_VIRTUAL Mz2TwU_  
  // Implementation JJbd h \  
 protected: 5<v1v&  
  HICON m_hIcon; ^5TVm>F@3  
  // Generated message map functions q jc4IW t~  
  //{{AFX_MSG(CCaptureDlg) C f d* Q  
  virtual BOOL OnInitDialog(); ~AX~z)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _FE uQ9E  
  afx_msg void OnPaint(); NjEi.]L*fX  
  afx_msg HCURSOR OnQueryDragIcon(); xYYa%PhIC  
  virtual void OnCancel(); ?0* [ L  
  afx_msg void OnAbout(); C:5d/9k  
  afx_msg void OnBrowse(); K#X/j'$^  
  afx_msg void OnChange(); v)_FiY QQ6  
 //}}AFX_MSG ?(d1;/0v>  
 DECLARE_MESSAGE_MAP() N AY3.e  
}; u?dPCgs;h  
#endif U 887@-!3  
'xkl|P>=],  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7f ub^'_  
#include "stdafx.h" =IQ}Y_xr  
#include "Capture.h" FibZT1-k  
#include "CaptureDlg.h" Rky]F+J  
#include <windowsx.h> V8B4e4F  
#pragma comment(lib,"hook.lib") -6NoEmb)\'  
#ifdef _DEBUG ZM v\j|{8  
#define new DEBUG_NEW vVa|E# [  
#undef THIS_FILE 5~IdWwG*w  
static char THIS_FILE[] = __FILE__; m<>BxX  
#endif P,'%$DLDg  
#define IDM_SHELL WM_USER+1 J-dB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g([:"y?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `=#jWZ.8m  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A7+ZY,  
class CAboutDlg : public CDialog #*_!Xc9f  
{ ^w~B]*A :"  
 public: H~Vf;k>  
  CAboutDlg(); 6V JudNA  
  // Dialog Data $'Mf$h  
  //{{AFX_DATA(CAboutDlg) ;2 &"  
  enum { IDD = IDD_ABOUTBOX }; breF,d$  
  //}}AFX_DATA LAf#Rco4  
  // ClassWizard generated virtual function overrides O=}Rp 1  
  //{{AFX_VIRTUAL(CAboutDlg) 1a{r1([)  
 protected: B^P&+,\[}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &*+$38XE^  
  //}}AFX_VIRTUAL f ?k0(rl  
  // Implementation h L [eA  
 protected: W>d)(  
  //{{AFX_MSG(CAboutDlg) %ZWt 45A  
  //}}AFX_MSG 9AB U^ig  
  DECLARE_MESSAGE_MAP() HV/:OCK  
}; ^OWG9`p+  
h`1<+1J9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) QtKcv7:4  
{ x$BNFb%I1  
 //{{AFX_DATA_INIT(CAboutDlg) jUA~}DVD  
 //}}AFX_DATA_INIT -W('^v_*  
} ;;+AdN5  
Nv36#^Z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) iD_y@+iz  
{ T Q4L~8  
 CDialog::DoDataExchange(pDX); Ri"hU/H{  
 //{{AFX_DATA_MAP(CAboutDlg) lN g){3  
 //}}AFX_DATA_MAP 6 V0Ayxg7  
} JJ?rVq1g  
j;coPehB  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ..u{v}4&  
 //{{AFX_MSG_MAP(CAboutDlg) 9_:"`)] 3B  
 // No message handlers r@zT!.sc!  
 //}}AFX_MSG_MAP a,RCK~GR  
END_MESSAGE_MAP() 8ex;g^e  
qD>^aEd@4  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) mXyP;k  
: CDialog(CCaptureDlg::IDD, pParent) ;i6~iLY  
{ \M\7k5$  
 //{{AFX_DATA_INIT(CCaptureDlg) klm>/MXI`  
  m_bControl = FALSE; n Ab~  
  m_bAlt = FALSE; ?}s;,_GH  
  m_bShift = FALSE; MBA?, |9Q#  
  m_Path = _T("c:\\"); 5>f"  
  m_Number = _T("0 picture captured."); [%dsq`b#  
  nCount=0; fS4W*P[B3  
  bRegistered=FALSE; sS}:Od  
  bTray=FALSE; aHW34e@ebL  
 //}}AFX_DATA_INIT \~,\|  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \Yr*x7!  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d%'#-w'  
} kMch   
zG ='U  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) lF}@@e)N  
{ @L!^2v  
 CDialog::DoDataExchange(pDX); `~u=[}w  
 //{{AFX_DATA_MAP(CCaptureDlg) cHFW"g78  
  DDX_Control(pDX, IDC_KEY, m_Key); ) >FAtE   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); "PI;/(kR  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Ex p ?x  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {\1bWr8!U  
  DDX_Text(pDX, IDC_PATH, m_Path); hTn"/|_SW  
  DDX_Text(pDX, IDC_NUMBER, m_Number); jerU[3  
 //}}AFX_DATA_MAP Ie^Ed`  
} > U?\WgE$  
)9yQ C  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6J,h}S  
//{{AFX_MSG_MAP(CCaptureDlg) a pa&'%7  
 ON_WM_SYSCOMMAND() :Pdh##k  
 ON_WM_PAINT() I8J>>H'#A  
 ON_WM_QUERYDRAGICON() H;nzo3x  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Zwc&4:5%  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) `Uz.9_6  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ~3:hed7:  
//}}AFX_MSG_MAP YTefEG]|q  
END_MESSAGE_MAP() #  `E  
Cb{D[  
BOOL CCaptureDlg::OnInitDialog() m6e(Xk,)  
{ :P_h_Tizv  
 CDialog::OnInitDialog(); 8+oc4~!A@n  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); X^eyrqv  
 ASSERT(IDM_ABOUTBOX < 0xF000); Ljz)%y[s  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 2T2<I/")O  
 if (pSysMenu != NULL) G^)]FwTs  
 { a^J(TW/  
  CString strAboutMenu; ]C,j80+pK  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %;QK5L   
  if (!strAboutMenu.IsEmpty()) Hl8-q!  
  { ' /HShS!d  
   pSysMenu->AppendMenu(MF_SEPARATOR); L1RD`qXu.  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ct-Bq  
  } YM_[   
 } ^aAs=KditO  
 SetIcon(m_hIcon, TRUE); // Set big icon {"Sv~L|J;  
 SetIcon(m_hIcon, FALSE); // Set small icon \UK}B  
 m_Key.SetCurSel(0); 5\quh2Q_  
 RegisterHotkey(); -&2Z/qM&!  
 CMenu* pMenu=GetSystemMenu(FALSE); #1J ,!seJ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wL),/i&<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); nzaDO-2!  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #VX]trh,  
 return TRUE; // return TRUE unless you set the focus to a control wd*B3  
} j67a?0<C2U  
9y6u&!PZ\  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) LD[\eJ _  
{ GW>F:<p  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) &qXobJRM  
 { =H;n$ -P  
  CAboutDlg dlgAbout; ]" V_`i7Z  
  dlgAbout.DoModal(); ZXQ5fBx  
 } ENhLonM eV  
 else ; j.d  
 { 8X`DFeJ  
  CDialog::OnSysCommand(nID, lParam); [ft6xI  
 } akbB=:M,x  
} 2K>1,[C'Z  
n`Pl:L*kG  
void CCaptureDlg::OnPaint() rwj+N%N  
{ >WLX5i&  
 if (IsIconic()) N/0aO^"V  
 { G;cC!x<  
  CPaintDC dc(this); // device context for painting M%ecWr!tj  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); tdRvg7v,N%  
  // Center icon in client rectangle bQ3<>e\%B  
  int cxIcon = GetSystemMetrics(SM_CXICON); x @43ZH_  
  int cyIcon = GetSystemMetrics(SM_CYICON); K9xvog  
  CRect rect; [6l0|Y  
  GetClientRect(&rect); -hnNa A  
  int x = (rect.Width() - cxIcon + 1) / 2; Z OPK  
  int y = (rect.Height() - cyIcon + 1) / 2; Fvk=6$d2  
  // Draw the icon ddN(L`nd  
  dc.DrawIcon(x, y, m_hIcon); yrEh5v:  
 } hGD@v {/  
 else =|AYT6z,  
 { 9cB+ x`+Lu  
  CDialog::OnPaint(); o7E|wS  
 } L3\#ufytb  
} $#f_p-N  
')q4d0B`"  
HCURSOR CCaptureDlg::OnQueryDragIcon() %R?7u'=~  
{ T=YVG@fm?  
 return (HCURSOR) m_hIcon; fmK~?  
} O'98OH+u  
A3tv'-e9  
void CCaptureDlg::OnCancel() toGd;2rl  
{ 8?LT*>!  
 if(bTray) &=)O:Jfa  
  DeleteIcon(); kF^4kCJ@  
  CDialog::OnCancel(); `Ns@W?  
} _Vp"G)1Y  
j|pTbOgk%  
void CCaptureDlg::OnAbout() (y; 6 H  
{ B /uaRi%  
 CAboutDlg dlg; MuMq%uDA"  
 dlg.DoModal(); Az y`4  
} 8>WA5:]v  
I H=$ w c  
void CCaptureDlg::OnBrowse() BAXu\a-C_  
{ hO[_ _j8  
 CString str;  ^cw9Yjh6  
 BROWSEINFO bi; )rP,+B?W  
 char name[MAX_PATH]; Kw"e4 a  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `w#VYs|k  
 bi.hwndOwner=GetSafeHwnd(); A^FkU  
 bi.pszDisplayName=name; n[e C  
 bi.lpszTitle="Select folder"; &c!6e<o[p  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @P~%4:!Hr  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?3K~4-!? /  
 if(idl==NULL) b?OA|JqX  
  return; >6yQuB  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !HU$V9C  
 str.ReleaseBuffer(); &4evh<z  
 m_Path=str; }Fu1Y@M%  
 if(str.GetAt(str.GetLength()-1)!='\\') ,gNZHKNq  
  m_Path+="\\"; *#>(P  
 UpdateData(FALSE); EpG9t9S9  
} :|kO}NGM  
4+>yL+sC%v  
void CCaptureDlg::SaveBmp() nG3SDL#(k  
{ \( V1-,  
 CDC dc; D+;4|7s+  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); OKm,iIp]  
 CBitmap bm; `lE&:)  
 int Width=GetSystemMetrics(SM_CXSCREEN); J'|[-D-a  
 int Height=GetSystemMetrics(SM_CYSCREEN); #!z-)[S.+  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zqt<[=O  
 CDC tdc; _Jg#T~  
 tdc.CreateCompatibleDC(&dc); 1@{ov!YB]  
 CBitmap*pOld=tdc.SelectObject(&bm); @d{}M)6\!  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); W=A0+t%XC  
 tdc.SelectObject(pOld); X=-=z5  
 BITMAP btm; yLLA:5Q1  
 bm.GetBitmap(&btm); N LpKh1g  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; \?v&JmEU  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |-vyhr 0  
 BITMAPINFOHEADER bih; V<|N}8{Z2a  
 bih.biBitCount=btm.bmBitsPixel; $:5h5Y#z  
 bih.biClrImportant=0; V C VqUCc  
 bih.biClrUsed=0; 16eP7s  
 bih.biCompression=0; 6!0NFP~b  
 bih.biHeight=btm.bmHeight; vcy1itY  
 bih.biPlanes=1; S+KKGi_e  
 bih.biSize=sizeof(BITMAPINFOHEADER); 037\LPO  
 bih.biSizeImage=size; >CKa?N;  
 bih.biWidth=btm.bmWidth; vM5I2C3_>!  
 bih.biXPelsPerMeter=0; 6 [XaIco=C  
 bih.biYPelsPerMeter=0; qU6!vgM&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); vh"';L_*37  
 static int filecount=0; An(gHi;1$  
 CString name; n%;qIKnIq\  
 name.Format("pict%04d.bmp",filecount++); Eyf17  
 name=m_Path+name; a9lYX*:  
 BITMAPFILEHEADER bfh; +Q_xY>ej  
 bfh.bfReserved1=bfh.bfReserved2=0; {=I,+[(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); M6cybEk`  
 bfh.bfSize=54+size; " Ke_dM  
 bfh.bfOffBits=54; pHVDug3  
 CFile bf; o(v`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1*9Yy~w  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); W!8$:Ih_Z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |af<2(d  
  bf.WriteHuge(lpData,size); n@@tO#!\  
  bf.Close(); H"pYj  
  nCount++; ~qb?#IY]`  
 } 4ybOK~z  
 GlobalFreePtr(lpData); `m AYK)N  
 if(nCount==1) hHw1<! M  
  m_Number.Format("%d picture captured.",nCount); (1{OQ0N+x  
 else ~:!& }e5  
  m_Number.Format("%d pictures captured.",nCount); 7m8:odeF  
  UpdateData(FALSE); p(4Ek"  
} 7je1vNs  
0_y&9Te  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 79Q,XRWh|  
{ *sfz+8Y  
 if(pMsg -> message == WM_KEYDOWN) K24y;968  
 { q{,yas7}  
  if(pMsg -> wParam == VK_ESCAPE) 0x'Fi2=`  
   return TRUE; &U.y):  
  if(pMsg -> wParam == VK_RETURN) >>J!|  
   return TRUE; _;(Q MeR  
 } 3joMtRB>;  
 return CDialog::PreTranslateMessage(pMsg); \hzx?  
} 3_VWtGQ  
qj*BV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /e*<-a  
{ z9#jXC#OdN  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f}FJR6VO  
  SaveBmp(); R<h0RKiM@  
  return FALSE; OK}8BY  
} gJOswN;([  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 5U<o%+^El  
 CMenu pop; A]V<K[9:b  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); mW_A 3S5  
 CMenu*pMenu=pop.GetSubMenu(0); Q%GLT,f1.  
 pMenu->SetDefaultItem(ID_EXITICON); ^eYJ7&t  
 CPoint pt; C$c.(5/O  
 GetCursorPos(&pt); 5o(=?dXm4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); p|*b] 36  
 if(id==ID_EXITICON) @qJv  
  DeleteIcon(); d<;XQ.Wo7  
 else if(id==ID_EXIT) iN`L*h  
  OnCancel(); 10/3-)+  
 return FALSE; !q PUQ+  
} J _|>rfW  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); wVs|mG"  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)  -gS/  
 AddIcon(); ]}0+7Q  
 return res; / dn]`Ge)  
} R91u6r#  
D3 E!jQ1  
void CCaptureDlg::AddIcon() 2gjA>ET`N  
{ 483vFLnF  
 NOTIFYICONDATA data; QaEXk5>e  
 data.cbSize=sizeof(NOTIFYICONDATA); KQqQ@D&n  
 CString tip; tX}Fb0y  
 tip.LoadString(IDS_ICONTIP); `+@%l*TQ  
 data.hIcon=GetIcon(0); [c6_6q As  
 data.hWnd=GetSafeHwnd(); Fn%:0j  
 strcpy(data.szTip,tip); Md m(xUs  
 data.uCallbackMessage=IDM_SHELL;  })w5`?Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; a-DE-V Uls  
 data.uID=98; :Ws3+OI'm3  
 Shell_NotifyIcon(NIM_ADD,&data); Nb{oH+$b  
 ShowWindow(SW_HIDE); /L[:C=u  
 bTray=TRUE; *m]%eU(  
} Z=sAR(n}~  
EA>$t\z  
void CCaptureDlg::DeleteIcon() AB#hh i#  
{ 3vs2}IV'  
 NOTIFYICONDATA data; !*#=7^#  
 data.cbSize=sizeof(NOTIFYICONDATA); ;6)|'3.B9  
 data.hWnd=GetSafeHwnd(); CnA*o 8w  
 data.uID=98; z KWi9  
 Shell_NotifyIcon(NIM_DELETE,&data); S"Zs'7dy`  
 ShowWindow(SW_SHOW); pK1(AV'L  
 SetForegroundWindow(); o_$r*Z|HG  
 ShowWindow(SW_SHOWNORMAL); RMrt4:-DI  
 bTray=FALSE; gA) F  
} uTJ?@ ^nq  
Cw^)}23R  
void CCaptureDlg::OnChange() Ip 1QmP  
{ y.oJzU[p%  
 RegisterHotkey(); CC87<>V  
} Em.?  
W]*wxzf!5z  
BOOL CCaptureDlg::RegisterHotkey() & ='uAw  
{ wYawG$@_  
 UpdateData(); p9sxA|O=y  
 UCHAR mask=0; 4-n.4j|  
 UCHAR key=0; bKaV]Uy  
 if(m_bControl) SO&;]YO  
  mask|=4; EX5kF  
 if(m_bAlt) D 7E^;W)H  
  mask|=2; |)_<JAN  
 if(m_bShift) 6qA{l_V  
  mask|=1; t[ MRyi)LF  
  key=Key_Table[m_Key.GetCurSel()]; aY+>85?g  
 if(bRegistered){ LtvyWc`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ) D`_V.,W  
  bRegistered=FALSE; BZ T%+s;u9  
 } wb9zJAsc  
 cMask=mask; }w@nZG ^&  
 cKey=key; Y\x Xo?  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Qqaf\$X  
 return bRegistered; QtzHr  
} bcE DjLXq  
)T+htD)  
  四、小结 J\0YL\jw1K  
!%(B2J  
  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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