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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: (hzN(Dh  
  KT(Z #$  
  一、实现方法 @yaFN>w  
JF .Lo;  
  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: ?0VR2Yb${b  
yJm"vN  
#pragma data_seg("shareddata") c[dzO .~  
HHOOK hHook =NULL; //钩子句柄 ]yU"J:/  
UINT nHookCount =0; //挂接的程序数目 HB/V4ki  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 WVbrbs4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 fSuykbZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 7Gc{&hp*  
static int KeyCount =0; \c}(rqT  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 >d2Fa4u3  
#pragma data_seg() 5~JT*Ny  
H$(bSw$  
  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。 zN4OrG 0  
Ic#xz;elM  
  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: JQ&t"`\k  
2d ! '9mA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR *x"80UXL  
cKey,UCHAR cMask) ;Ba%aaHl  
{ LwH#|8F  
 BOOL bAdded=FALSE; rVYoxXv  
 for(int index=0;index<MAX_KEY;index++){ >1~ /:DJ  
  if(hCallWnd[index]==0){ <$(B[T  
   hCallWnd[index]=hWnd; i6`"e[aT[o  
   HotKey[index]=cKey; /8cRPB.  
   HotKeyMask[index]=cMask; |7s2xRc  
   bAdded=TRUE; bmfM_oz  
   KeyCount++; V8?}I)#(7  
   break; K9lgDk"i  
  } g7*)|FOb  
 } yw3"jdcl  
 return bAdded; WlMcEje  
} |"3<\$[  
//删除热键 7;"0:eX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 11[lc2  
{ }{o !  
 BOOL bRemoved=FALSE; gb ga"WO  
 for(int index=0;index<MAX_KEY;index++){ |cPHl+$nh.  
  if(hCallWnd[index]==hWnd){ o\IMYT  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u epyH  
    hCallWnd[index]=NULL; qLN^9PdEE  
    HotKey[index]=0; 2@&r!Q|1vR  
    HotKeyMask[index]=0; B`5<sW  
    bRemoved=TRUE; g`7XE  
    KeyCount--; "F<CGSo  
    break; BX,)G HE  
   } Aw o)a8e  
  } (yOkf-e2y  
 } ~C.*Vc?|  
 return bRemoved; 0+1wi4wy/  
} 1uw#;3<L  
E9HMhUe  
> VG  
  DLL中的钩子函数如下: H",B[ YK  
AZtS4]4G)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a|aVc'j  
{ bLgH3[{  
 BOOL bProcessed=FALSE; /:&!o2&1H  
 if(HC_ACTION==nCode) Lsmcj{1d  
 { ^PksXfk  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 J3K=z  
   switch(wParam) 7|P kc(O  
   {  U@lc 1#  
    case VK_MENU: NR{wq|"  
     MaskBits&=~ALTBIT; l\HdB"nT  
     break; aER|5!7(2\  
    case VK_CONTROL: 9(CvGzco <  
     MaskBits&=~CTRLBIT; |y\Km  
     break; o\AnM5  
    case VK_SHIFT: s[1ao"sZ^  
     MaskBits&=~SHIFTBIT; lo1Ui`V  
     break; ]rmBM  
    default: //judge the key and send message sGvbL-S-f:  
     break; \U~4b_aN  
   } ${+u-Wfau  
   for(int index=0;index<MAX_KEY;index++){ c8qr-x1HG  
    if(hCallWnd[index]==NULL) !liV Y]  
     continue; $Gn.G_"v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e%4?-{(  
    { 29R-Up!SVN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); W L$^B@gXQ  
     bProcessed=TRUE; v\0G`&^1  
    } Q=\ Oa(I  
   } LSo!_tY  
  } 8!g `bC#%  
  else if((lParam&0xc000ffff)==1){ //有键按下 ::L2zVq5V  
   switch(wParam) Nd_fjB  
   { bQAznd0  
    case VK_MENU: B~Q-V&@o  
     MaskBits|=ALTBIT; &c`-/8c  
     break; ]|;+2@kDR  
    case VK_CONTROL: }kbSbRH43  
     MaskBits|=CTRLBIT; -+9[X*VCc  
     break; adON&<  
    case VK_SHIFT: bQll;U^A  
     MaskBits|=SHIFTBIT; B*7kX&Uq  
     break; cw;wv+|k  
    default: //judge the key and send message .b :!qUE^  
     break; $ |4C]Me (  
   } 5/48w-fnZ  
   for(int index=0;index<MAX_KEY;index++){ q>q:ZV  
    if(hCallWnd[index]==NULL) 0bNvmZ$  
     continue; D)_ C@*q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]' mbHkn68  
    { \ /-c)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .J#'k+>  
     bProcessed=TRUE; aD/Rr3v>  
    } E$d3+``  
   } FoefBo?g65  
  } OfsP5*d  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 3JoY-  
   for(int index=0;index<MAX_KEY;index++){ z(PUoV:?  
    if(hCallWnd[index]==NULL) ZTC>Ufu2!  
     continue; Vs>Pv$kW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) w7nt $L5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #XV=,81w  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Er~17$b  
   } C \ Cc[v  
  } $o6/dEKQ  
 } Urj*V0^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C3AWXO ^  
} 2`yhxO  
x "W~m.y$h  
  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:  K +7  
H/8^Fvd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N&8TG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?M2(8 0  
;#B(L=/  
  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: I8*VM3  
;'!x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !Jg;%%E3:i  
{ (Guzj*12  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]{-.?W*$  
 { jA? #!lx_  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 c=\tf~}^Ms  
  SaveBmp(); (5a73%>@  
  return FALSE; P{L=u74b{x  
 } 7GA8sK  
 …… //其它处理及默认处理 Wj{lb_Rj  
} B|(g?  
! VwU=5  
\j)Evjw  
  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。 -K"'F`;W  
8(3(kZxS  
  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。 iT@` dEZ .  
>WLPE6E  
  二、编程步骤 r)(5,*v  
P -m_],  
  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"; npP C;KD  
!U`&a=k  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {N(qS'N  
+vc+9E.?9  
  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; 570Xk\R@M  
jiI=tg;  
  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; 3)OZf{D[  
#86N !&x  
  5、 添加代码,编译运行程序。 D?|D)"?qb  
hW7u#PY  
三、程序代码 9O[IR)O~  
[X(m[u'%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL OY*y<>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {sTf4S\S  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ BU nujC  
#if _MSC_VER > 1000 ,5'o>Y  
#pragma once  <,.$U\W  
#endif // _MSC_VER > 1000 D(cD8fn,J  
#ifndef __AFXWIN_H__ p l)":}/)  
#error include 'stdafx.h' before including this file for PCH 1- RY5R}VR  
#endif mq:k |w^6  
#include "resource.h" // main symbols Xz]l#w4 Pp  
class CHookApp : public CWinApp u09Tlqh0 3  
{ $ m`Dyu  
 public: MVatV[G  
  CHookApp(); &lc@]y8  
  // Overrides 0Q3U\cDr  
  // ClassWizard generated virtual function overrides PA2} 4`  
  //{{AFX_VIRTUAL(CHookApp) I2}W/}  
 public: 0AZ9I!&i  
  virtual BOOL InitInstance(); wG3L+[,  
  virtual int ExitInstance(); .=y=Fv6X  
  //}}AFX_VIRTUAL 0 9H rn  
  //{{AFX_MSG(CHookApp) .5JIQWE(  
  // NOTE - the ClassWizard will add and remove member functions here. = XZU9df  
  // DO NOT EDIT what you see in these blocks of generated code ! 3 ML][|TR  
  //}}AFX_MSG OjU{r N*  
  DECLARE_MESSAGE_MAP() fif;n[<  
}; DR"Y(-xl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); x0 7 =  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }2 S.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); HG]ARgOB  
BOOL InitHotkey(); FlO?E3d  
BOOL UnInit(); h*%p%t<  
#endif :@w~*eK~  
:J;U~emq  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 8)B{x[?|  
#include "stdafx.h" Za.}bR6?Y  
#include "hook.h" [d`Jw/4n  
#include <windowsx.h> #83   
#ifdef _DEBUG z:'m50'  
#define new DEBUG_NEW D@=]mh6vl  
#undef THIS_FILE ~tUZQ5"  
static char THIS_FILE[] = __FILE__; #1YMpL  
#endif Km2~nkQ  
#define MAX_KEY 100 P0N/bp2Uy  
#define CTRLBIT 0x04 /Qgb t  
#define ALTBIT 0x02 Z;+,hR((  
#define SHIFTBIT 0x01 tpI/I bq  
#pragma data_seg("shareddata") hvt]VC]]  
HHOOK hHook =NULL; \e a*  
UINT nHookCount =0; Quth5  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey }OkzP)(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT .0Ud?v>=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 6:_~-xG  
static int KeyCount =0; 3mgvWR  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift %p7 ?\>  
#pragma data_seg() +V=<vT  
HINSTANCE hins; d`\SX(C  
void VerifyWindow(); U$:^^Zt`B  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 01Jav~WR  
//{{AFX_MSG_MAP(CHookApp) >N3X/8KL%  
// NOTE - the ClassWizard will add and remove mapping macros here. EeaJUK]z9  
// DO NOT EDIT what you see in these blocks of generated code! ,\`ruWWLb=  
//}}AFX_MSG_MAP /Pjd"  
END_MESSAGE_MAP() ,Csdon  
]t[%.^5#  
CHookApp::CHookApp() H )X[%+  
{ {/[@uMS_6]  
 // TODO: add construction code here, +=WBH'  
 // Place all significant initialization in InitInstance QW..=}pL  
} CKw-HgXG  
)\U:e:Zae  
CHookApp theApp; LcKc#)'EE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g}9 ,U&$]y  
{ lyL6w1  
 BOOL bProcessed=FALSE; 6O4 *OR<&  
 if(HC_ACTION==nCode) iBE|6+g~Cj  
 { a$W O} g?  
  if((lParam&0xc0000000)==0xc0000000){// Key up AFt- V  
   switch(wParam) V``|<`!gd  
   { ?!ap @)9  
    case VK_MENU: tbQY&TO1  
     MaskBits&=~ALTBIT; 5{ap  
     break; S iNgV\('U  
    case VK_CONTROL: &zn|),  
     MaskBits&=~CTRLBIT; h]zok}$  
     break; ~XUUrg;  
    case VK_SHIFT: %/eG{ oh-  
     MaskBits&=~SHIFTBIT; ?M90K)&g{  
     break; h!B{7J  
    default: //judge the key and send message lU 9o"2  
     break; ,|f=2t+5X  
   } 4lo7yx  
   for(int index=0;index<MAX_KEY;index++){ cg )(L;  
    if(hCallWnd[index]==NULL) #m#IBRD:  
     continue; &UDbH* !4=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~'*23]j  
    { CXUF=IE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R/u0,  
     bProcessed=TRUE; [w](x  
    } 2<7pe@c98  
   } W{Qb*{9  
  } l(Y32]Z   
  else if((lParam&0xc000ffff)==1){ //Key down \]Y<d  
   switch(wParam) Tp;W  
   { S5|7D[*  
    case VK_MENU: :F d1k Jm  
     MaskBits|=ALTBIT; 4#t'1tzu#  
     break; |A4B4/!  
    case VK_CONTROL:  2  
     MaskBits|=CTRLBIT; I/'>MDB!  
     break; !fs ~ >  
    case VK_SHIFT: %g*nd#wG  
     MaskBits|=SHIFTBIT; K-YxZAf  
     break; 9#H0|zL  
    default: //judge the key and send message CCpRQKb=  
     break; /A5=L<T6F  
   } czw:xG!&  
   for(int index=0;index<MAX_KEY;index++) (,"%fc7<i  
   { Q3=X#FQ  
    if(hCallWnd[index]==NULL) D~inR3(}  
     continue; ~N /%R>(v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Sh;`<Ggi~  
    { %X\J%Fj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); QM!UMqdj  
     bProcessed=TRUE; yS)k"XNb  
    } B^19![v3T  
   } Zn1((J7  
  } !yg &zzP*  
  if(!bProcessed){ VI3fvGHat{  
   for(int index=0;index<MAX_KEY;index++){ f$</BND  
    if(hCallWnd[index]==NULL) t<`wK8)  
     continue; E.yFCaL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6oKlr,.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); iMry0z  
   } | {zka.sJ  
  } `B?+1Gv  
 } ]Vf p,"op  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :~s"]*y  
} y**L^uvr  
'>OEQU5-  
BOOL InitHotkey() )1 @v<I  
{ $_%  
 if(hHook!=NULL){ n2aUj(Zs=  
  nHookCount++; y 2k's  
  return TRUE; DvN_}h^nX  
 } &2@"zD  
 else zt((TD2  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "= s dn  
  if(hHook!=NULL) d+Mogku2  
   nHookCount++; *{JD= ua  
  return (hHook!=NULL); w8>lWgN  
} 7d{xXJ-  
BOOL UnInit() Yy!G?>hC  
{ n n[idw  
 if(nHookCount>1){ 0o6r3xc;  
  nHookCount--; .K940& Ui  
  return TRUE; >yyu:dk-;  
 } <-d-. 8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); X"8$,\wX,  
 if(unhooked==TRUE){ kPEU}Kv  
  nHookCount=0; +Km xo4p  
  hHook=NULL; uA?a DjA  
 } }zo-%#  
 return unhooked; >iJxq6!  
} ?h7[^sxJ  
u`L*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) cB;DB) 0P  
{ % [,^2s  
 BOOL bAdded=FALSE; O[ans_8  
 for(int index=0;index<MAX_KEY;index++){ ?`*`A9@  
  if(hCallWnd[index]==0){ F&/ }x15  
   hCallWnd[index]=hWnd; PHsM)V+  
   HotKey[index]=cKey; NFU=PS$  
   HotKeyMask[index]=cMask; G4F~V't  
   bAdded=TRUE; TDtHR hq7  
   KeyCount++; EY1L5 Ba.  
   break; LGy!{c  
  } Yv*i69"  
 } "| oW6@  
 return bAdded; (yu0iXZY  
} }Ny~.EV5^  
I1ibrn  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (ds*$]  
{ fQU_A  
 BOOL bRemoved=FALSE; a.<!>o<t:  
 for(int index=0;index<MAX_KEY;index++){ @S012} xH  
  if(hCallWnd[index]==hWnd){ [o'}R`5)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +w?1<Z  
    hCallWnd[index]=NULL; Tq6@ 1j6p  
    HotKey[index]=0; HV3D$~gF  
    HotKeyMask[index]=0; wZ8LY;  
    bRemoved=TRUE;  `Q^Vm3h  
    KeyCount--; k/xNqN(  
    break; :)e/(I]  
   } Yh%  
  } @iz6)2z  
 } Io;26F""  
 return bRemoved; 9/\=6v C|  
} iL IKrU+`  
U&tR1v'  
void VerifyWindow() /Hc0~D4|x  
{ T/7[hj  
 for(int i=0;i<MAX_KEY;i++){ 7`X9s~B  
  if(hCallWnd!=NULL){ B415{  
   if(!IsWindow(hCallWnd)){ H% c{ }F  
    hCallWnd=NULL; DB1Y`l  
    HotKey=0; LD5E  
    HotKeyMask=0; m+'X8}GC#O  
    KeyCount--; an?g'8! r:  
   } 7w"YCRKh  
  } {' |yb  
 } T|nN.  
} pQxi0/dp  
X/wqfP  
BOOL CHookApp::InitInstance() }Sb&ux  
{ |}roR{gc|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); jdDcmR  
 hins=AfxGetInstanceHandle(); M8lR#2n|  
 InitHotkey(); LYiz:cQh  
 return CWinApp::InitInstance(); zPoIs @  
} z3}4 +~~  
xZ"kJ'C4}  
int CHookApp::ExitInstance() [[u&=.Au  
{ 8<ri"m,  
 VerifyWindow(); Ib4 8`  
 UnInit(); $VJ=A<  
 return CWinApp::ExitInstance(); >^Z!  
} ph1veD<ZZ  
? Kn~fs8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file k}Vu!+cz  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) hMs}r,*  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \+w -{"u$  
#if _MSC_VER > 1000 V/!8q`lYNJ  
#pragma once ]pA}h. R#-  
#endif // _MSC_VER > 1000 <<![3&p#  
?G-a:'1!6  
class CCaptureDlg : public CDialog {z%%(,I  
{ kR-5RaW  
 // Construction , v6[#NU_Z  
 public: 'W j Q  
  BOOL bTray; .es= w=  
  BOOL bRegistered; }F R yG%  
  BOOL RegisterHotkey(); Icf@uQ6  
  UCHAR cKey; _zO,VL  
  UCHAR cMask; t UW'E  
  void DeleteIcon(); }%rz"kB  
  void AddIcon(); P8s'e_t  
  UINT nCount; h^0!I TL^  
  void SaveBmp(); {4{ACp  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor SIRZ_lt$r  
  // Dialog Data >!YI7)  
  //{{AFX_DATA(CCaptureDlg) #6JCm!s  
  enum { IDD = IDD_CAPTURE_DIALOG }; N1!|nS3w  
  CComboBox m_Key; A]vQ1*pnk  
  BOOL m_bControl; V9m1n=r  
  BOOL m_bAlt; IV:Knh+ ?  
  BOOL m_bShift; ji2if.t@  
  CString m_Path; G>{;@u  
  CString m_Number; Rf\>bI<.  
  //}}AFX_DATA 9W7H",wR  
  // ClassWizard generated virtual function overrides B)"WG7W E  
  //{{AFX_VIRTUAL(CCaptureDlg) S*CRVs  
 public: Kc\0-3 Z  
  virtual BOOL PreTranslateMessage(MSG* pMsg); G\IH b |  
 protected: W"WvkW>-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )5X7|*LP  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?z60b=f8  
  //}}AFX_VIRTUAL _"F(w"|  
  // Implementation *-Y|qS%  
 protected: BZx#@356N  
  HICON m_hIcon; A\.M/)Qo  
  // Generated message map functions v1zJr6ra9  
  //{{AFX_MSG(CCaptureDlg) (85F1"Jp  
  virtual BOOL OnInitDialog(); <OW` )0UX  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); n4CzReG  
  afx_msg void OnPaint(); ZWVcCa 3  
  afx_msg HCURSOR OnQueryDragIcon(); /gHRJ$2|Sx  
  virtual void OnCancel(); TZZ qV8  
  afx_msg void OnAbout(); eGLLh_V"  
  afx_msg void OnBrowse(); c-avX  
  afx_msg void OnChange(); ")(1z@  
 //}}AFX_MSG ^QV;[ha,o  
 DECLARE_MESSAGE_MAP() `pN]Ykt  
}; W~Mj6c~S"  
#endif &ze'V , :  
jvm "7)h  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $- #M~eZv  
#include "stdafx.h" "$:nz}  
#include "Capture.h" W?R$+~G  
#include "CaptureDlg.h" F1|4([-<]  
#include <windowsx.h> P[ KJuc  
#pragma comment(lib,"hook.lib") 8N8B${X  
#ifdef _DEBUG  Jb {m  
#define new DEBUG_NEW r0j:ll d  
#undef THIS_FILE *RM#F !A  
static char THIS_FILE[] = __FILE__; "v~w#\pz7  
#endif E<&VK*{zcO  
#define IDM_SHELL WM_USER+1 @eT!v{o  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x%x:gkq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hlkf|H  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; E9226  
class CAboutDlg : public CDialog .Fh5:W N  
{ 8X*6i-j5E  
 public: sOLo[5y'  
  CAboutDlg(); F/RV{} 17E  
  // Dialog Data }(TZ}* d  
  //{{AFX_DATA(CAboutDlg) o &LNtl;  
  enum { IDD = IDD_ABOUTBOX }; -F|(Y1OE  
  //}}AFX_DATA s bW`  
  // ClassWizard generated virtual function overrides rxCu V  
  //{{AFX_VIRTUAL(CAboutDlg) ^X0<ZI  
 protected: lcIX l&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 59T:{d;~  
  //}}AFX_VIRTUAL S]{K^Q),  
  // Implementation 18ci-W#p  
 protected: ybf`7KEP2A  
  //{{AFX_MSG(CAboutDlg) |n67!1  
  //}}AFX_MSG AytHnp\H  
  DECLARE_MESSAGE_MAP() 6eK18*j%H  
}; Fv5@-&y$W  
Dw6Q2Gnv  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |yN7#O-D  
{ le|e 4f*+  
 //{{AFX_DATA_INIT(CAboutDlg) d%4!d_I<  
 //}}AFX_DATA_INIT U4zyhj  
} tq>QZEg  
eyl+D sK  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ga~rllm;i  
{ 0V`0="rQ  
 CDialog::DoDataExchange(pDX); qz(0iZ]Y  
 //{{AFX_DATA_MAP(CAboutDlg) Ge[N5N>  
 //}}AFX_DATA_MAP S4`uNB#Ht  
} q^goi 1  
PGu6hV{  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) =}U`q3k  
 //{{AFX_MSG_MAP(CAboutDlg) M.!U;U<?  
 // No message handlers kY4riZnm  
 //}}AFX_MSG_MAP kV6T#RVob  
END_MESSAGE_MAP() ~++y4NB8Q  
H-0A&oG  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Cq/*/jBM  
: CDialog(CCaptureDlg::IDD, pParent) 0rA&_K[#-<  
{ s'fHh G6  
 //{{AFX_DATA_INIT(CCaptureDlg) Al' sY^B  
  m_bControl = FALSE; 0sk*A0HX-  
  m_bAlt = FALSE; SukRJvi  
  m_bShift = FALSE; RNp3lXf O  
  m_Path = _T("c:\\"); -5d8j<,  
  m_Number = _T("0 picture captured."); d^WVWk K  
  nCount=0; zn>*^h0B  
  bRegistered=FALSE; nP4jOq*H  
  bTray=FALSE; pz@_%IUS  
 //}}AFX_DATA_INIT  g5X+iV  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 O\B_=KWDO  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;wgm 'jr  
} "DfvoQP  
`gD'q5.z;3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _~=X/I R  
{ ix$?/GlL  
 CDialog::DoDataExchange(pDX); # TC x8]F  
 //{{AFX_DATA_MAP(CCaptureDlg) do7 [Nj  
  DDX_Control(pDX, IDC_KEY, m_Key); &D>e>]E|P  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |z Gwt Z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); )DfmO  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); N 0&h5  
  DDX_Text(pDX, IDC_PATH, m_Path); Yep(,J~'  
  DDX_Text(pDX, IDC_NUMBER, m_Number); lySeq^y?Q  
 //}}AFX_DATA_MAP 2\lUaC#E  
} X]tjT   
_)zSjFX9  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) HpuHJ#l  
//{{AFX_MSG_MAP(CCaptureDlg) *>9#a0cp  
 ON_WM_SYSCOMMAND() X9#Od9cNaC  
 ON_WM_PAINT() 5A Vo#}&\  
 ON_WM_QUERYDRAGICON() ^zO%O653  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) VLA9&.*@  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *pyi;  
 ON_BN_CLICKED(ID_CHANGE, OnChange) g  O,X  
//}}AFX_MSG_MAP DU4NPys]y  
END_MESSAGE_MAP() ,57g_z]V  
D#1'#di*t  
BOOL CCaptureDlg::OnInitDialog() <<@$0RW  
{ ePa1 @dI  
 CDialog::OnInitDialog(); \ :1MM  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~z^VMr  
 ASSERT(IDM_ABOUTBOX < 0xF000); |Ah26<&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); tB'F`HM:mq  
 if (pSysMenu != NULL) ~aNK)<Fznd  
 { [l:3F<M  
  CString strAboutMenu; wH3FCfvm  
  strAboutMenu.LoadString(IDS_ABOUTBOX); IFH%R>={  
  if (!strAboutMenu.IsEmpty()) |k{?\(h;  
  { q4|TwRx~  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0:@:cz=#*  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .&T JSIx$  
  } n Uz 2~z  
 } q!$?G]-%  
 SetIcon(m_hIcon, TRUE); // Set big icon lnEc5J@c>i  
 SetIcon(m_hIcon, FALSE); // Set small icon c&e?_@} |  
 m_Key.SetCurSel(0); Ef;_im  
 RegisterHotkey(); ~ 61O  
 CMenu* pMenu=GetSystemMenu(FALSE); ,[D,G  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^g$k4  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =oV8 !d%]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); iL)q':xz  
 return TRUE; // return TRUE unless you set the focus to a control z0t6}E<VIR  
} nG1 mx/w  
UsNr$MO {  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) d>M&jSCL  
{ ;m,lS_[c  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @c,}\"(  
 { J@=1zL  
  CAboutDlg dlgAbout; KCGs*kp>  
  dlgAbout.DoModal(); /iQ}DbtRb  
 } &G@(f=  
 else 'sn%+oN  
 { BBm.;=8@ ^  
  CDialog::OnSysCommand(nID, lParam); <fCgU&  
 } t7H2z}06=h  
} cmmH)6c>  
@f{yx\u/  
void CCaptureDlg::OnPaint() KN'l/9.  
{ Vrf2%$g  
 if (IsIconic()) eOt T*  
 { no?TEXp*  
  CPaintDC dc(this); // device context for painting MGCwT@P  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )@RTU~#  
  // Center icon in client rectangle -IMm#  
  int cxIcon = GetSystemMetrics(SM_CXICON); ?<YtlqL  
  int cyIcon = GetSystemMetrics(SM_CYICON); i44UqEb  
  CRect rect; 7v}4 Pl,$4  
  GetClientRect(&rect); J/pW*G-U|  
  int x = (rect.Width() - cxIcon + 1) / 2; 43W>4fsc  
  int y = (rect.Height() - cyIcon + 1) / 2; SXSH9;j  
  // Draw the icon ?C(Z\"IX  
  dc.DrawIcon(x, y, m_hIcon); Ro*$7j0!Hf  
 } 4tz8^z[Kw  
 else Uq 2Uv  
 { Is` S  
  CDialog::OnPaint(); 5@" bx=  
 } 6d&BN7B  
} VZ &>zF  
LDN'o1$qo  
HCURSOR CCaptureDlg::OnQueryDragIcon() hV;Tm7I2  
{ )NGBA."t  
 return (HCURSOR) m_hIcon; /ZlW9|  
} pM9Hav@iWU  
mDC{c ?  
void CCaptureDlg::OnCancel() w1F7gd  
{ :W<ag a;J  
 if(bTray) $g$~TuA w  
  DeleteIcon(); [CGvM {  
  CDialog::OnCancel(); BA' ($D>  
} ,-ZAI b*  
Xw!eB?A  
void CCaptureDlg::OnAbout() 8RbtI4  
{ g><u (3  
 CAboutDlg dlg; j0L9Q|s  
 dlg.DoModal(); *YZ' Uy?  
} 41>Bm*if  
1b+ B  
void CCaptureDlg::OnBrowse() HNxJ`x~Z~  
{ "ZE JL.Wy  
 CString str; 0I* ^VGZ  
 BROWSEINFO bi; Z`v6DfK}  
 char name[MAX_PATH]; O66\s q  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); u`$,S& Er  
 bi.hwndOwner=GetSafeHwnd(); %?J\P@  
 bi.pszDisplayName=name; 2/RK pl &  
 bi.lpszTitle="Select folder"; e<dFvMO  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; G'q7@d {'  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]^Z7w`=%5  
 if(idl==NULL) Pk T&zSQA  
  return; W%hdS<b  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); RX4O1Z0  
 str.ReleaseBuffer(); )/PvaL  
 m_Path=str; ^ ]SS\=7  
 if(str.GetAt(str.GetLength()-1)!='\\') D"j =|4S#  
  m_Path+="\\";  %1<No/  
 UpdateData(FALSE); #M&rmKv)g  
} @g(N!n~  
us\@n"  
void CCaptureDlg::SaveBmp() n=MdbY/k(  
{ I >k3X~cG  
 CDC dc; 8s-RNA>7^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Gy.<gyK9  
 CBitmap bm; S;M'qwN  
 int Width=GetSystemMetrics(SM_CXSCREEN); N*$<Kjw  
 int Height=GetSystemMetrics(SM_CYSCREEN); x~!B.4gT2  
 bm.CreateCompatibleBitmap(&dc,Width,Height); H@bra~k-  
 CDC tdc; Bs =V-0  
 tdc.CreateCompatibleDC(&dc); m=Y9sB  
 CBitmap*pOld=tdc.SelectObject(&bm); c!T^JZBb  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); h`Vb#5 ik  
 tdc.SelectObject(pOld); 73P=<3  
 BITMAP btm; IhwJYPLF  
 bm.GetBitmap(&btm); 9~I\WjB "  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {J%Na&D  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); P5* :r3>  
 BITMAPINFOHEADER bih; ZZ A!Y9ia2  
 bih.biBitCount=btm.bmBitsPixel;  4%LG9hS  
 bih.biClrImportant=0; L7_(KCh  
 bih.biClrUsed=0; ZD/>L/  
 bih.biCompression=0; 9xP{#Qa  
 bih.biHeight=btm.bmHeight; K20n355uE  
 bih.biPlanes=1; TDBWYppM  
 bih.biSize=sizeof(BITMAPINFOHEADER); BWFl8 !_X  
 bih.biSizeImage=size; /p~"?9b[ i  
 bih.biWidth=btm.bmWidth; D{Y~ kV|  
 bih.biXPelsPerMeter=0; w5gN8ZF3  
 bih.biYPelsPerMeter=0; 6%H8Q v  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,w; ~R4x  
 static int filecount=0; VQU[5C  
 CString name; 9"52b 9U  
 name.Format("pict%04d.bmp",filecount++); LO[1xE9  
 name=m_Path+name; eW"i'\`0  
 BITMAPFILEHEADER bfh; {/uBZ(   
 bfh.bfReserved1=bfh.bfReserved2=0; W:O<9ZbQ_  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ~:b bV6YO  
 bfh.bfSize=54+size; D QP#h5O  
 bfh.bfOffBits=54; 2!\y0*}K  
 CFile bf; ~QFD ^SoK  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ C$){H"#  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); hhlQ!WV2  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); /|t vGC.#  
  bf.WriteHuge(lpData,size); 0bQaXxt|p  
  bf.Close(); Vo+d3  
  nCount++; nMx0+N1  
 } 0 lXV+lj  
 GlobalFreePtr(lpData); \=Af AO@  
 if(nCount==1) zT#36+_?  
  m_Number.Format("%d picture captured.",nCount); V9-pY/v 9  
 else E:V&:9aQ@  
  m_Number.Format("%d pictures captured.",nCount); !H{)L@f  
  UpdateData(FALSE); Iwi>yx8  
} <*0MD6 $5  
gGw6c" FRQ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) H$KE*Wwq  
{ 8A"[n>931  
 if(pMsg -> message == WM_KEYDOWN) DBAJkBs  
 { VH4P|w[YF  
  if(pMsg -> wParam == VK_ESCAPE) %}%D8-d}G  
   return TRUE; /O|!Sg{  
  if(pMsg -> wParam == VK_RETURN) r(yJE1Wz  
   return TRUE; (M4~N)7<P5  
 } >C+0LF`U  
 return CDialog::PreTranslateMessage(pMsg); 3:<+9X  
} Ky|Hi3?  
Jme}{!3m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %56pP"w  
{ Odxq]HlbO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %\_I% yF  
  SaveBmp(); cE 8vSQ%  
  return FALSE; L$zT`1Hy  
} W=5+k0Q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ JmrQDO_(  
 CMenu pop; &UP@Sr0D7  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); '[-gK n  
 CMenu*pMenu=pop.GetSubMenu(0); AJ2Xq*fk  
 pMenu->SetDefaultItem(ID_EXITICON); B h@R9O<  
 CPoint pt; ?4Lb*{R  
 GetCursorPos(&pt); [@kzC/Jq3  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0(Y$xg  
 if(id==ID_EXITICON) ~^lQ[x  
  DeleteIcon(); ?*u)T%S  
 else if(id==ID_EXIT) ($E(^p% O  
  OnCancel(); FRF3V>  
 return FALSE; )~_!u}+:(  
} WEqHL,Uh]  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Xx:0Nt]  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) q?[{fcNh$  
 AddIcon(); d%1S6eYa'  
 return res; G(JvAe]r  
} Q}^ n  
u9:;ft{}N  
void CCaptureDlg::AddIcon() 'Vy$d<@s[  
{ reM%GU  
 NOTIFYICONDATA data; JnhHV(H  
 data.cbSize=sizeof(NOTIFYICONDATA); o%h\55S  
 CString tip; B5#a 4G.  
 tip.LoadString(IDS_ICONTIP); UL; d H  
 data.hIcon=GetIcon(0); KZ ?<&x  
 data.hWnd=GetSafeHwnd(); 6Kh: m-E9  
 strcpy(data.szTip,tip); 0MMY{@n  
 data.uCallbackMessage=IDM_SHELL; zF;}b3oIo  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 86/CA[Y-  
 data.uID=98; L}nj#z4g  
 Shell_NotifyIcon(NIM_ADD,&data); <%JdQ82?  
 ShowWindow(SW_HIDE); v 8{oXzyy  
 bTray=TRUE; PdMx6 Ab  
} Mb\~WUWI  
&w2.b:HF  
void CCaptureDlg::DeleteIcon() $MKx\qx}  
{ 1(w0* `  
 NOTIFYICONDATA data; ]WN{8   
 data.cbSize=sizeof(NOTIFYICONDATA); (loUO;S=  
 data.hWnd=GetSafeHwnd(); fL83:<RK  
 data.uID=98; u~LisZ&tP  
 Shell_NotifyIcon(NIM_DELETE,&data); 4dMwJ"V  
 ShowWindow(SW_SHOW); < t>N(e  
 SetForegroundWindow(); ^>GL<1 1  
 ShowWindow(SW_SHOWNORMAL); <^R\N#  
 bTray=FALSE; ;Bc f~[ErM  
} (z2)<_bXJ  
rMe` HM@  
void CCaptureDlg::OnChange() (S5'iks x  
{ !aa^kcEjnL  
 RegisterHotkey(); q*DR~Ov  
} |1g2\5Re  
uFSgjWJ#~  
BOOL CCaptureDlg::RegisterHotkey() akm)X0!-}  
{ &lBfW$PZjk  
 UpdateData(); |xQj2?_z*  
 UCHAR mask=0; {aGQ[MH\9  
 UCHAR key=0; 1uB}Oe 2~  
 if(m_bControl) Zdh4CNEeFP  
  mask|=4; 'QeqWn  
 if(m_bAlt) 5y=X?hF~)  
  mask|=2; iA^w2K  
 if(m_bShift) A6lf-8ncx  
  mask|=1; GaRL]w  
  key=Key_Table[m_Key.GetCurSel()]; l#:=zu  
 if(bRegistered){ F__DPEAc_  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); WHbvb3'  
  bRegistered=FALSE; ?aSL'GI  
 } Lrq+0dI 65  
 cMask=mask; wH|\;M{0V1  
 cKey=key; H.Jcp|k[;  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); y>~=o9J_u  
 return bRegistered; SjlkKulMF  
} e6s L N  
Mk@_uPm  
  四、小结 CG=#rc]vz  
eqeVz`  
  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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