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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: 1n.F`%YG  
  .H&XP W  
  一、实现方法 Qdc)S>gp  
6]HMhv  
  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: ys7 Tq+  
y^ st T^  
#pragma data_seg("shareddata") z'gJy  
HHOOK hHook =NULL; //钩子句柄 w`=XoYQl~*  
UINT nHookCount =0; //挂接的程序数目 #??[;xjs!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 T7Ju7_q}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ~eiD(04^r*  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5pff}Ru`  
static int KeyCount =0; jF#Dc[*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 N~?#Qh|ZnU  
#pragma data_seg() Tg=P*HY6  
 Tx'anP  
  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。 4:s,e<Tc4v  
fP\*5|7%R  
  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: VY=YI}E  
8@FgvWC  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /(%!txSNEt  
cKey,UCHAR cMask) CRNt5T>qH  
{ C_h$$G{S(  
 BOOL bAdded=FALSE; 6y{CM/DC  
 for(int index=0;index<MAX_KEY;index++){ TeJ=QpGW2  
  if(hCallWnd[index]==0){ ArT@BqWd  
   hCallWnd[index]=hWnd; .rlLt5b%  
   HotKey[index]=cKey; "5\6`\/  
   HotKeyMask[index]=cMask; }/L#<n`Z  
   bAdded=TRUE; *A0d0M]cg  
   KeyCount++; R|*Eg,1g -  
   break; IfP?+yPa  
  } G//hZwf0  
 } lxR]Bh+  
 return bAdded; @)ls+}=Y  
} _]0<G8|Rv  
//删除热键 YlZ&4   
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @qF:v]=_@  
{ !bn=b>+  
 BOOL bRemoved=FALSE; &}#zG5eu  
 for(int index=0;index<MAX_KEY;index++){ ]KUeSg|  
  if(hCallWnd[index]==hWnd){ hij 9r z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >``  
    hCallWnd[index]=NULL; [[ll4|  
    HotKey[index]=0; TFXKCl  
    HotKeyMask[index]=0; $+U 6c~^^  
    bRemoved=TRUE; <Iil*\SC  
    KeyCount--; r#J_;P{U  
    break; a3Xd~Qs  
   } {?}^HW9{  
  } 5'|W(yR}  
 } ;[:IC^9fv  
 return bRemoved; .k,,PuP  
} "z*?#&?,  
8 9maN  
!&{"tL@.  
  DLL中的钩子函数如下: "=2'Oqp1  
VMu?mqEa  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) m mH xPd  
{ +Ur75YPh  
 BOOL bProcessed=FALSE; X#fjIrn  
 if(HC_ACTION==nCode) {s:"mkR  
 { Bf3 QB]9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @oD2_D2  
   switch(wParam) gzDfx&.0  
   {  1 q|iw  
    case VK_MENU: !-JvVdM;(  
     MaskBits&=~ALTBIT; M'pIAm1p  
     break; j.\0p-,  
    case VK_CONTROL: {}H/N   
     MaskBits&=~CTRLBIT; >H,E3Z  
     break; ofs'xs1C  
    case VK_SHIFT: ZsP>CELm@  
     MaskBits&=~SHIFTBIT; CSBDSz  
     break; CsjrQ-#9yn  
    default: //judge the key and send message  y&wo"';  
     break; q7I(x_y /  
   } JOwu_%  
   for(int index=0;index<MAX_KEY;index++){ -\25&m!+  
    if(hCallWnd[index]==NULL) sDBwD%sb  
     continue; xO4""/ n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oE,TA2  
    { qXoq< |  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "z-tL  
     bProcessed=TRUE; sg4(@>  
    } nZEew .T:6  
   } m;ju@5X  
  } R_ )PbFw  
  else if((lParam&0xc000ffff)==1){ //有键按下 m!3D5z]n9  
   switch(wParam) bicbCC6kC  
   { 'oUTY *  
    case VK_MENU: Fx:4d$>;  
     MaskBits|=ALTBIT; <00=bZzX  
     break; SErh"~[  
    case VK_CONTROL: 2dDhO  
     MaskBits|=CTRLBIT; WwxV} ?Cf+  
     break; @c).&7  
    case VK_SHIFT: yqP=6   
     MaskBits|=SHIFTBIT; *Xh#W7,<  
     break; ! iK{q0  
    default: //judge the key and send message CXTt N9N9  
     break; 6;(b-Dhi  
   } wU"w  
   for(int index=0;index<MAX_KEY;index++){  %Nx,ZD@  
    if(hCallWnd[index]==NULL) 7t/Y5Qf  
     continue; h\+8eeIl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y3SV6""y/  
    { 28 zZ3|Z3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #];ulDq  
     bProcessed=TRUE; A f}o/g  
    } |<uBJ-5  
   } g@Rs.Zq  
  } 7JBr{3;eS  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 v<mSd2B*  
   for(int index=0;index<MAX_KEY;index++){ apnpy\in  
    if(hCallWnd[index]==NULL) #8y"1I=i&  
     continue; wn\ R|'Rdz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) v4Kf{9q#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]2A2<Q_,  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?6h~P:n.  
   } n3$u9!|P  
  } 3#eAXIW[  
 } -vc ,O77z"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +x<OyjY5?]  
} L^K,YlNBR  
alBnN<UM  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 3Zwhv+CP[  
_9?v?mL5;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5f2=`C0_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  \+:`nz3m  
\ rKUPI\  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: cg9*+]rc  
=)a %,H  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q#\B}'I{  
{ +{#Z^y6&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 9_ ~9?5PU  
 { >:BgatyPH  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 RMdU1@  
  SaveBmp(); j]aIJbi  
  return FALSE; G3h"Eo?>g  
 } p(9[*0.};  
 …… //其它处理及默认处理 XV,ce~ro[  
} IYa(B+nB)  
e*d lGK3l  
A+FQmLS  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 X1BqN+=@9  
Dn#UcMO>W  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 O9N+<sU=X  
C 'S_M@I=  
  二、编程步骤 TP)o0U  
j,z)x[3}  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; dux_v"Xl  
Mhc5<~?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; MM( ,D& Z  
G&4D0f  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 5xU}}[|~-  
I.`D BI#-f  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; H}(WL+7  
qac:"z'9  
  5、 添加代码,编译运行程序。 r$Ik* R  
_qh \  
三、程序代码 <N3~X,ch  
V}Oz!  O  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL KIKIag#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ^==Tv+T9U  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 'z@]hm#  
#if _MSC_VER > 1000 -lXQQ#V -  
#pragma once <vu~EY0.  
#endif // _MSC_VER > 1000 `, 4YPjk^  
#ifndef __AFXWIN_H__ 2EO9IxIf  
#error include 'stdafx.h' before including this file for PCH ce719n$   
#endif l_,6<wWp  
#include "resource.h" // main symbols Mgu9m8 `J  
class CHookApp : public CWinApp ;ZkY[5  
{ [jEA|rd~}  
 public: %=V" }P[  
  CHookApp(); &3)6WD?:U  
  // Overrides p0}Yo8?OW  
  // ClassWizard generated virtual function overrides o ,xy'  
  //{{AFX_VIRTUAL(CHookApp) ZVit] 3hd  
 public: ~{N#JOY}Z  
  virtual BOOL InitInstance(); z]=Ks_7  
  virtual int ExitInstance(); NdRE,HWd?$  
  //}}AFX_VIRTUAL JV+Uy$P!  
  //{{AFX_MSG(CHookApp) JIc9csr:b  
  // NOTE - the ClassWizard will add and remove member functions here. @ ]42.oP  
  // DO NOT EDIT what you see in these blocks of generated code ! 8: uh0  
  //}}AFX_MSG )QmmI[,tq  
  DECLARE_MESSAGE_MAP() gV*4{ d`  
}; -w'g0/fD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ::3[H$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4#I=n~8a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {}=5uU2Tu  
BOOL InitHotkey(); ?zVcP=p@  
BOOL UnInit(); !#E-p?O.  
#endif >xH?`I7;f  
y5VohVa`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. oeI[x  
#include "stdafx.h" ^}:0\;|N  
#include "hook.h" r]kks_!Z  
#include <windowsx.h> .'2"83f  
#ifdef _DEBUG S'>KGdF  
#define new DEBUG_NEW %O{FZgi%wA  
#undef THIS_FILE uVXn/B  
static char THIS_FILE[] = __FILE__; vY[ u;VU  
#endif %f(4jQ0I  
#define MAX_KEY 100 _ -,[U{  
#define CTRLBIT 0x04 e$mVA}>Ybp  
#define ALTBIT 0x02 M R,A{X  
#define SHIFTBIT 0x01 W!TT fj   
#pragma data_seg("shareddata") `}8)P#  
HHOOK hHook =NULL; '%YTM N@  
UINT nHookCount =0; 0t*PQ%  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey '8I=Tn  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 7dlMDHp\Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey s"8z q ;)  
static int KeyCount =0; )a+bH</'  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Qb;]4[3  
#pragma data_seg() "kucFf f  
HINSTANCE hins; 'z+Pa^)v  
void VerifyWindow(); v~p?YYOm<  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 9>_VU"T  
//{{AFX_MSG_MAP(CHookApp) ,3)JZM  
// NOTE - the ClassWizard will add and remove mapping macros here. r 2{7h>  
// DO NOT EDIT what you see in these blocks of generated code! @#9xSs#  
//}}AFX_MSG_MAP tao9icl*`  
END_MESSAGE_MAP() kjSzu qB  
h}S2b@e|  
CHookApp::CHookApp() E#kH>q@K`$  
{ 9mpQusM  
 // TODO: add construction code here, [yRqSB  
 // Place all significant initialization in InitInstance 37V$Qb_  
} c3\p@}  
$A(3-n5=  
CHookApp theApp; &((04<@e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +^$;oG  
{ HS1{4/  
 BOOL bProcessed=FALSE; kC'm |Y@T  
 if(HC_ACTION==nCode) jank<Q&w  
 { j\.e6&5%SS  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^Je*k)COn  
   switch(wParam) D9n+eZ  
   { 9YBlMf`KEf  
    case VK_MENU: 9,}Z1 f\%  
     MaskBits&=~ALTBIT; #O'g*]j  
     break; YKx+z[A/p  
    case VK_CONTROL: \;"S>dg  
     MaskBits&=~CTRLBIT; F<)f&<5E-  
     break; @Z96902<t  
    case VK_SHIFT: 6$fwpW  
     MaskBits&=~SHIFTBIT; gX* &RsF  
     break; 4@-Wp]  
    default: //judge the key and send message 3V]psZS  
     break; 1+tPd7U  
   } ^SwU]e  
   for(int index=0;index<MAX_KEY;index++){ ikPr>  
    if(hCallWnd[index]==NULL) J/[PA[Rf  
     continue; UG<<.1JL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WkoYkkuzj  
    { pU u')y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D P:}<  
     bProcessed=TRUE; %\%&1  
    } mn\GLR.  
   } I*(7(>zgyv  
  } gER(&L4[  
  else if((lParam&0xc000ffff)==1){ //Key down >rFM8P(  
   switch(wParam) ==bT0-M.~  
   { *`tQX$F  
    case VK_MENU: U.|0y=  
     MaskBits|=ALTBIT; ^9|&w.:@Q  
     break; .GW)"`HbU  
    case VK_CONTROL: eBe5H =I@  
     MaskBits|=CTRLBIT; "fSK7%BP  
     break; TI7)yxa=`  
    case VK_SHIFT: W'Qy4bl7C  
     MaskBits|=SHIFTBIT; |@)jS.Bn  
     break; {_4zm&  
    default: //judge the key and send message  o7AI  
     break; `1R[J4e  
   } +ZRm1q   
   for(int index=0;index<MAX_KEY;index++) L_>LxF43  
   { McvLU+  
    if(hCallWnd[index]==NULL) ;i3C  
     continue; QmsS,Zljo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jgw+c3^R_  
    { 8sL+ik"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /IC]}0kkp  
     bProcessed=TRUE; m9Dg%\B  
    } 0fR?zT?  
   } D\sh +}"  
  } BagV\\#v4  
  if(!bProcessed){ mpl^LF[  
   for(int index=0;index<MAX_KEY;index++){ 1sfs!b&E  
    if(hCallWnd[index]==NULL) [wUJ ~~2#  
     continue; mS]soYTQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '_xa>T}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }i\_`~  
   } 4Y@q.QP  
  } r / L  
 } l{_1`rC'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &|Vzo@D(!  
} 'Ub\8<HfJU  
E^m2:J]G  
BOOL InitHotkey() (DTkK5/%  
{ IPnx5#eB  
 if(hHook!=NULL){ Ly6) ,[q~  
  nHookCount++; _Tma1 ~Gq  
  return TRUE; 0O?!fd n  
 } R"QWap}  
 else f<@`{oP@  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); $`/F5R!  
  if(hHook!=NULL) jt&rOPL7  
   nHookCount++; 4eS(dPI0  
  return (hHook!=NULL); L4Si0 K  
} <9?`zo$y  
BOOL UnInit() 'S; l"  
{ $60]RCu  
 if(nHookCount>1){ L$f:D2Ei  
  nHookCount--; cX48?srG  
  return TRUE; U9q6m3#$  
 } Za1VJ5-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -O[9{`i]  
 if(unhooked==TRUE){ t$*CyYb{@  
  nHookCount=0; y1Yrf,E m=  
  hHook=NULL; h/#s\>)T  
 } X(K5>L>  
 return unhooked; ==~ lc;  
} K_BF=C.k  
Uj~ :| ?Wz  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qg8T}y>  
{ {+|Em(M  
 BOOL bAdded=FALSE; `~ R%}ID  
 for(int index=0;index<MAX_KEY;index++){ M{U7yE6*j*  
  if(hCallWnd[index]==0){ &0euNHH;sL  
   hCallWnd[index]=hWnd; i>@"&  
   HotKey[index]=cKey; @!Q\| <  
   HotKeyMask[index]=cMask; ZN(@M@}  
   bAdded=TRUE; I~7eu&QZ  
   KeyCount++; B_|jDH#RyJ  
   break; irzWk3@:  
  } o!|TCwt  
 } ,"4  
 return bAdded; QgW4jIbx  
} q,_ 1?A)  
7j\jOkl V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) N >+L?C  
{ }G[Qm2k  
 BOOL bRemoved=FALSE; 0D48L5kH#'  
 for(int index=0;index<MAX_KEY;index++){ -8,lXrH  
  if(hCallWnd[index]==hWnd){ 8E\6RjM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2sXX0kq~V  
    hCallWnd[index]=NULL; `n~bDG>  
    HotKey[index]=0; ngQ]  
    HotKeyMask[index]=0; !4!Y~7sI"\  
    bRemoved=TRUE; \Y}nehxG@  
    KeyCount--; /g]m,Y{OI  
    break; o_ SR  
   } qi-!iT(fe  
  } fk:oCPo  
 } Q::6|B,G  
 return bRemoved; }\)O1  
} ]!04L}hy|P  
i.*Utm`1"e  
void VerifyWindow() qUF}rl S=r  
{ iKuSk~  
 for(int i=0;i<MAX_KEY;i++){ bZ*J]1y(.  
  if(hCallWnd!=NULL){ X{b qG]j  
   if(!IsWindow(hCallWnd)){ uE{nnNZy  
    hCallWnd=NULL; vOYG&)Jm  
    HotKey=0; B*j AD2  
    HotKeyMask=0; 2x&mJ}o#k  
    KeyCount--; <hbxerg  
   } MUU9IMFJ  
  } dzPwlCC%-  
 } +MP`iuDO  
} EBPm7{&0|  
hM @F|t3  
BOOL CHookApp::InitInstance() ,V2,FoJ 9  
{ , H_Cn1l  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1]vrpJw  
 hins=AfxGetInstanceHandle(); uyITUvPg[  
 InitHotkey(); m;d#*}n\p  
 return CWinApp::InitInstance(); 7'9~Kx&+  
} Iz<}>J B  
6Q.6  
int CHookApp::ExitInstance() Ad:)5R o  
{ @SV.F  
 VerifyWindow(); 8P'zQ:#RV  
 UnInit(); -hIDL'5u-I  
 return CWinApp::ExitInstance(); i''[ u  
} L5tSS=  
5w+X   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file LE:nmo  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) F7zBm53  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4^mpQ.]lO  
#if _MSC_VER > 1000 Cp 2$I<T  
#pragma once @< @\CiM  
#endif // _MSC_VER > 1000 ^q0Ox&X  
0*KU"JcXd  
class CCaptureDlg : public CDialog [LJ1wBMw  
{ T};fy+iq  
 // Construction E#=slj @  
 public: r!vSYgee  
  BOOL bTray; `kd P)lI `  
  BOOL bRegistered; 7TjK;w7xS.  
  BOOL RegisterHotkey(); 7#BpGQJQ  
  UCHAR cKey; hw [G  
  UCHAR cMask; K2glkGK  
  void DeleteIcon(); _pv<_ Sm  
  void AddIcon(); D20n'>ddg  
  UINT nCount; E|jbbCZy2  
  void SaveBmp();  v NJ!d  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ta-kqt!'  
  // Dialog Data 76rNs|z~  
  //{{AFX_DATA(CCaptureDlg) i|5K4Puu  
  enum { IDD = IDD_CAPTURE_DIALOG }; ^Fr82rJs  
  CComboBox m_Key; W=$d|*$  
  BOOL m_bControl; 6R+m;'  
  BOOL m_bAlt; $(ugnnJ*  
  BOOL m_bShift; Jn_;  cN  
  CString m_Path; *hp3w  
  CString m_Number; \*0ow`|K  
  //}}AFX_DATA PKhH0O\_U  
  // ClassWizard generated virtual function overrides jz_\B(m9%  
  //{{AFX_VIRTUAL(CCaptureDlg) mG!Rh  
 public: $DOBC@xxzT  
  virtual BOOL PreTranslateMessage(MSG* pMsg); [C]u!\(IF  
 protected: =*aun&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #lM :BO  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >d&_e[j  
  //}}AFX_VIRTUAL 0N~AQu  
  // Implementation B|-E3v:f 4  
 protected: IZV D.1  
  HICON m_hIcon; .OHjn|  
  // Generated message map functions {VPF2JFB[  
  //{{AFX_MSG(CCaptureDlg) Gmi w(T  
  virtual BOOL OnInitDialog(); ZCZYgf@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); mRT`'fxK  
  afx_msg void OnPaint(); R30{/KK  
  afx_msg HCURSOR OnQueryDragIcon(); m 4Vh R_  
  virtual void OnCancel(); (q!tI* }  
  afx_msg void OnAbout(); AK/_^?zAs  
  afx_msg void OnBrowse(); xA-O?s"CY  
  afx_msg void OnChange(); RSLMO8  
 //}}AFX_MSG Jp<Y2-  
 DECLARE_MESSAGE_MAP() TixXA:Mf  
}; t7#C&B  
#endif 8lo /BGxS>  
{BBL`tg60  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Azun"F_f  
#include "stdafx.h" C~.7m-YW  
#include "Capture.h" AKVll  
#include "CaptureDlg.h" gu[3L  
#include <windowsx.h> h^h!OQKQ  
#pragma comment(lib,"hook.lib") |RBgJkS;8  
#ifdef _DEBUG .6yC' 3~;o  
#define new DEBUG_NEW jj,Y:  
#undef THIS_FILE FfnW  
static char THIS_FILE[] = __FILE__; 821@qr|`e  
#endif mJaWzR  
#define IDM_SHELL WM_USER+1 }];8v+M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -,t2D/xK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q Fv"!Ql  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; oGi;S="I  
class CAboutDlg : public CDialog 8m0GxgS  
{ F)mlCGv:R  
 public: X0Q};,  
  CAboutDlg(); _ 13M  
  // Dialog Data 7tgn"wK  
  //{{AFX_DATA(CAboutDlg) cNzn2-qv  
  enum { IDD = IDD_ABOUTBOX }; R&13P&:g  
  //}}AFX_DATA v*+.;60_  
  // ClassWizard generated virtual function overrides _e<3 g9bj  
  //{{AFX_VIRTUAL(CAboutDlg) p.9VyM  
 protected: Tz H*?bpP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S.bB.<  
  //}}AFX_VIRTUAL 8S_i;  
  // Implementation 8v7;{4^  
 protected: b$kCyOg  
  //{{AFX_MSG(CAboutDlg) _q >>]{5  
  //}}AFX_MSG /=9t$u|  
  DECLARE_MESSAGE_MAP() 8-Ik .,}  
}; je6H}eWTC6  
v Dgf}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :^+ aJ]  
{ K8{Ub  
 //{{AFX_DATA_INIT(CAboutDlg) F2yc&mXyk  
 //}}AFX_DATA_INIT Y4]USU!PA  
} zK`z*\  
\K+LKa)  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }v[*V   
{ z\Vu`Y z  
 CDialog::DoDataExchange(pDX); ^zPa^lo-  
 //{{AFX_DATA_MAP(CAboutDlg) ;Ub;AqY  
 //}}AFX_DATA_MAP u%FG% j?C  
} &h.E B  
^NB @wuf7  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) "wi=aV9j  
 //{{AFX_MSG_MAP(CAboutDlg) )J&1uMp{  
 // No message handlers FI1R7A  
 //}}AFX_MSG_MAP q(0V#kKC  
END_MESSAGE_MAP() (B@:0}>  
H tIl;E  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Fv \yhR  
: CDialog(CCaptureDlg::IDD, pParent) w) o^?9T  
{ \hpD  
 //{{AFX_DATA_INIT(CCaptureDlg)  GU99!.$  
  m_bControl = FALSE; 6@`Y6>}$_  
  m_bAlt = FALSE; UxZT&x3=)}  
  m_bShift = FALSE; Zvd^<SP<?  
  m_Path = _T("c:\\"); ;0Yeo"-  
  m_Number = _T("0 picture captured."); 5I ,5da  
  nCount=0; Np>[mNmga  
  bRegistered=FALSE; .l$'%AG:~  
  bTray=FALSE; dALJlRo"  
 //}}AFX_DATA_INIT $gm`}3C<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %zx=rn(K  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &?\ h[3  
} LJK<Xen  
(J(JB}[X,  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) f(Q-W6  
{ Sr1xG%;|/  
 CDialog::DoDataExchange(pDX); nlaJ  
 //{{AFX_DATA_MAP(CCaptureDlg) E5.3wOE  
  DDX_Control(pDX, IDC_KEY, m_Key); LyM"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); hC@oyC(4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); L M  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); tmF->~|  
  DDX_Text(pDX, IDC_PATH, m_Path); uop|8n1  
  DDX_Text(pDX, IDC_NUMBER, m_Number); f5jxF"oGNo  
 //}}AFX_DATA_MAP Q70LQCms  
} %\8E{M:  
x{IxS?.j+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Z)cGe1?q  
//{{AFX_MSG_MAP(CCaptureDlg) gR)T(%W  
 ON_WM_SYSCOMMAND() YNCQPN\v`1  
 ON_WM_PAINT() |,c\R"8xS  
 ON_WM_QUERYDRAGICON() :d7Ju.*J  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `N%q^f~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^<fN  
 ON_BN_CLICKED(ID_CHANGE, OnChange) oTj9/r  
//}}AFX_MSG_MAP AyZL(  
END_MESSAGE_MAP() P#5&D*`}h  
`~'yy q  
BOOL CCaptureDlg::OnInitDialog() M&Aeh8>uX  
{ $i&u\iL  
 CDialog::OnInitDialog(); "*O(3L.c-  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); epa)~/sA  
 ASSERT(IDM_ABOUTBOX < 0xF000); .K>r ao'  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %;+Q0 e9  
 if (pSysMenu != NULL) 9mW95YI S  
 { .JIn(  
  CString strAboutMenu; X PnN"Y"y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,B ]kX/W  
  if (!strAboutMenu.IsEmpty()) Z6%Hhk[  
  { IM:*uv  
   pSysMenu->AppendMenu(MF_SEPARATOR); L=W8Q8hf  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Z'EX q.hk  
  } d6ZJh xJ  
 } iXpLcHi  
 SetIcon(m_hIcon, TRUE); // Set big icon \Ub=Wm\  
 SetIcon(m_hIcon, FALSE); // Set small icon g7G=ga  
 m_Key.SetCurSel(0); GmoY~}cg~  
 RegisterHotkey(); >(Mu9ie*`  
 CMenu* pMenu=GetSystemMenu(FALSE); bgs2~50  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,zmGKn#n2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); z7X[$T$V  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _:4n&1{.E  
 return TRUE; // return TRUE unless you set the focus to a control #Pi}2RBRu  
} hawE2k0p(  
S~auwY,<  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 6A$ \I44  
{ };%l <Ui;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) FFGG6r  
 { 5yO %|)  
  CAboutDlg dlgAbout; u`Kjs}F'  
  dlgAbout.DoModal(); _:|/4.]`_  
 } iT#)i3   
 else C"w>U   
 { "NqB_?DT  
  CDialog::OnSysCommand(nID, lParam); {J-kcD!bz`  
 } "]|I;I"b  
} 6X{RcX]/  
.s7Cr0^k,|  
void CCaptureDlg::OnPaint() FL -yt  
{ 0mj^Tms  
 if (IsIconic()) ye Q6\yi  
 { i6F`KF'i&  
  CPaintDC dc(this); // device context for painting ptXCM[Z+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %G!BbXlz  
  // Center icon in client rectangle /lBx}o'  
  int cxIcon = GetSystemMetrics(SM_CXICON); > D:( HWL  
  int cyIcon = GetSystemMetrics(SM_CYICON); #SiOx/  
  CRect rect; B=K& +  
  GetClientRect(&rect); FbRq h|  
  int x = (rect.Width() - cxIcon + 1) / 2; j_2-  
  int y = (rect.Height() - cyIcon + 1) / 2; xf/ SUO F  
  // Draw the icon f{=0-%dA  
  dc.DrawIcon(x, y, m_hIcon); Z6G>j  
 } "_Wv,CYmNr  
 else  =lIG#{`Q  
 { 7I>@PV N  
  CDialog::OnPaint(); @ %LrpD  
 } 0_7A <   
}  h"<-^=b  
5"1kfB3v  
HCURSOR CCaptureDlg::OnQueryDragIcon() B16,c9[  
{ cnfjO g'\{  
 return (HCURSOR) m_hIcon; J)R;NYl  
} E>xd*23+\  
w>M8 FG(4]  
void CCaptureDlg::OnCancel()  'Q\I@s }  
{ m4FT^ ^3yE  
 if(bTray) pUV3n 1{2  
  DeleteIcon(); ~Xa8\>  
  CDialog::OnCancel(); "W:#4@ F  
} bnS"@^M  
e)I-|Q4^%  
void CCaptureDlg::OnAbout() $J8?!Xg  
{ go^?F- dZ  
 CAboutDlg dlg; U#3Y3EdF<  
 dlg.DoModal(); gp Aqz Y  
} O=c^Ak   
8P8@i+[]W  
void CCaptureDlg::OnBrowse() 0'ha!4h3Z  
{ 9/N=7<$  
 CString str; Hk)IV"[R  
 BROWSEINFO bi; "p<B|  
 char name[MAX_PATH]; u*#j;Xc  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); s>8;At-  
 bi.hwndOwner=GetSafeHwnd(); 6 Fz?'Xf  
 bi.pszDisplayName=name; A1{ 7g<k6  
 bi.lpszTitle="Select folder"; \bJ,8J1C  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4,D$% .  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); W10=SM}  
 if(idl==NULL) 24u;'i-y5  
  return; 59eq"08  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $ekJs/I&  
 str.ReleaseBuffer(); ^_dYE]t  
 m_Path=str; d;GF<bz  
 if(str.GetAt(str.GetLength()-1)!='\\') iY @MnnX  
  m_Path+="\\"; nqX)+{wAXe  
 UpdateData(FALSE); nSWW^ ;  
} 3\J-=U  
@k_xA-a  
void CCaptureDlg::SaveBmp() 1_}* aQ  
{ *$uj)*5,  
 CDC dc; +k=BD s  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); iQryX(z  
 CBitmap bm; hrsMAh!  
 int Width=GetSystemMetrics(SM_CXSCREEN); _&0_@  
 int Height=GetSystemMetrics(SM_CYSCREEN); i|zs Li/  
 bm.CreateCompatibleBitmap(&dc,Width,Height); %au2kG,  
 CDC tdc; U j5%06  
 tdc.CreateCompatibleDC(&dc); :{za[,  
 CBitmap*pOld=tdc.SelectObject(&bm); )m . KV5K!  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Rlvb@aXgy  
 tdc.SelectObject(pOld); g8<Ja(J  
 BITMAP btm; .QRa{l_)  
 bm.GetBitmap(&btm); :CH?,x^!@  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; !?t#QD o  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); dW hU o\>=  
 BITMAPINFOHEADER bih; >l|ao&z>bm  
 bih.biBitCount=btm.bmBitsPixel; :xdl I`S  
 bih.biClrImportant=0; o[C,fh,$  
 bih.biClrUsed=0; }Yd7<"kp  
 bih.biCompression=0; ,9T-\)sT  
 bih.biHeight=btm.bmHeight; q'r(#,B<3  
 bih.biPlanes=1; 7A!E~/nSC  
 bih.biSize=sizeof(BITMAPINFOHEADER); l ;TWs_N  
 bih.biSizeImage=size; MXy~kb&  
 bih.biWidth=btm.bmWidth; GjDs,9@f  
 bih.biXPelsPerMeter=0; <=m@Sg{o  
 bih.biYPelsPerMeter=0; ;0j 8Xj  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !`j}%!K!  
 static int filecount=0; !L..I2'  
 CString name; N%8O9Dp8;  
 name.Format("pict%04d.bmp",filecount++); 6I,^4U  
 name=m_Path+name; 19.+"H  
 BITMAPFILEHEADER bfh; N_AAhD  
 bfh.bfReserved1=bfh.bfReserved2=0; SJ/($3GkBd  
 bfh.bfType=((WORD)('M'<< 8)|'B'); rGPFPsMQ]  
 bfh.bfSize=54+size; C'4gve 7!  
 bfh.bfOffBits=54; udCum4  
 CFile bf; +&t`"lRl&  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ u} y)'eH  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));  "u#T0  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 9 gt$z}oU  
  bf.WriteHuge(lpData,size); p#['CqP8  
  bf.Close(); F(j vdq  
  nCount++; }= )  
 } zCOzBL/1q  
 GlobalFreePtr(lpData); g\%vkK&I  
 if(nCount==1) D]NfA2B7  
  m_Number.Format("%d picture captured.",nCount); eUa2"=M  
 else 9 U6cM-p?  
  m_Number.Format("%d pictures captured.",nCount); 1+P&O4>  
  UpdateData(FALSE); 9~AAdD  
} kB41{Y -  
Qfx:}zk{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >Q159qZ  
{ ~N2<-~=si  
 if(pMsg -> message == WM_KEYDOWN) _0Mt*]L }  
 { p-p]dV  
  if(pMsg -> wParam == VK_ESCAPE) $9_yD&&  
   return TRUE; zqd_^  
  if(pMsg -> wParam == VK_RETURN) h/T^+U?-<  
   return TRUE; 2(5HPRQ  
 } ~Q  q0  
 return CDialog::PreTranslateMessage(pMsg); *{}Y :  
} xW`,@a }  
Tnw0S8M  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lIs<&-0  
{ v.wHj@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ^cQTRO|  
  SaveBmp(); )vO?d~x|  
  return FALSE; C_c*21X  
} 4dfR}C  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ygwej2  
 CMenu pop; %XIPPEHU  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !1g2'  
 CMenu*pMenu=pop.GetSubMenu(0); LV$@J  
 pMenu->SetDefaultItem(ID_EXITICON); zkFx2(Hq-f  
 CPoint pt; 2m$\]\kCUv  
 GetCursorPos(&pt); %hEhZW{:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Oy> V/  
 if(id==ID_EXITICON) $Tc"7nYu  
  DeleteIcon(); W{z7h[?5,  
 else if(id==ID_EXIT) !F@9xG  
  OnCancel(); 5e> <i  
 return FALSE; !G`7T  
} e.8(tEqZ1  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jrOqspv   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *)+K+J  
 AddIcon(); 8OYw72&  
 return res; =3~u.iq$  
} :cx}I  
@Yv+L)  
void CCaptureDlg::AddIcon() *3,Kn}ik  
{ +:JyXF u  
 NOTIFYICONDATA data; g\Ck!KJ/y  
 data.cbSize=sizeof(NOTIFYICONDATA); -+#QZ7b  
 CString tip; Vh%=JL sK  
 tip.LoadString(IDS_ICONTIP); :$=r^LSH  
 data.hIcon=GetIcon(0);  4[\[Ho  
 data.hWnd=GetSafeHwnd(); WfnBWSA2 T  
 strcpy(data.szTip,tip); +\@) 1  
 data.uCallbackMessage=IDM_SHELL; m[k@\xS4e  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =wd=TX/  
 data.uID=98; $)V_oQSqn  
 Shell_NotifyIcon(NIM_ADD,&data); U6 4WTS@  
 ShowWindow(SW_HIDE); hcQky/c\#b  
 bTray=TRUE; ,5tW|=0@  
} ?3X(`:KB  
JjD'2"z  
void CCaptureDlg::DeleteIcon() y@\R$`0J  
{ Rn"Raq7Cn*  
 NOTIFYICONDATA data; s]D&):  
 data.cbSize=sizeof(NOTIFYICONDATA); -!p +^wC  
 data.hWnd=GetSafeHwnd(); W,\LdQ  
 data.uID=98; QX1rnVzg0  
 Shell_NotifyIcon(NIM_DELETE,&data); DU@ZLk3  
 ShowWindow(SW_SHOW); %Ls5:Z=  
 SetForegroundWindow(); L?W F[nF R  
 ShowWindow(SW_SHOWNORMAL); G;^},%<  
 bTray=FALSE; {$dq7m(  
} 1WArgR  
H%}ro.u  
void CCaptureDlg::OnChange() e:&+m`OSH  
{ 6 /A#P$G  
 RegisterHotkey(); FCk4[qOp7  
} |U~m8e&:  
v2vPf b  
BOOL CCaptureDlg::RegisterHotkey() QT!!KTf  
{ ?1+JBl~/d  
 UpdateData(); 'G6M:IXno  
 UCHAR mask=0; dtXA EL\q  
 UCHAR key=0; mX4u#$xs:  
 if(m_bControl) Z= 'DV1A$,  
  mask|=4; I U Mt^z  
 if(m_bAlt) ^rHG#^hA  
  mask|=2; `|{6U"n  
 if(m_bShift) X=sC8Edx  
  mask|=1; zc}qAy'<  
  key=Key_Table[m_Key.GetCurSel()]; \.@fAgv  
 if(bRegistered){ 7K*\F}2)q  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); , W w\C  
  bRegistered=FALSE; VE <p,IO  
 } W .B>"u  
 cMask=mask; m!Iax]D{  
 cKey=key; tA*hh"9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); KGVAP  
 return bRegistered; iyj,0T  
} F(yx/W>Br_  
BdK2I!mm  
  四、小结 xK8n~.T('  
n$jOk |W  
  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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