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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: W _b $E =  
  ao{>.b  
  一、实现方法 _DC/`_'  
OJ UM Y<5  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: K@n.$g  
D0i84I`Z%  
#pragma data_seg("shareddata") bS/`G0!  
HHOOK hHook =NULL; //钩子句柄 g8XGZW!  
UINT nHookCount =0; //挂接的程序数目 =(v!pEF  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 SX^fh.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^&&dO*0{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey g) v"nNS  
static int KeyCount =0; n{BC m %  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ejo4mQ]a  
#pragma data_seg() ErESk"2t  
EFql g9bK  
  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。 ?xQ lX%&`6  
77i |a]Kd  
  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: no?)GQ  
&;)~bS(   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR r %0  
cKey,UCHAR cMask) U_}$QW0'  
{ !u6~#.7  
 BOOL bAdded=FALSE; ?RpT_u  
 for(int index=0;index<MAX_KEY;index++){ bwVv#Z\r  
  if(hCallWnd[index]==0){ a #@Q.wL  
   hCallWnd[index]=hWnd; YGWb!|Z$  
   HotKey[index]=cKey; +1d\ZZA|6&  
   HotKeyMask[index]=cMask; #-'}r}1ZT  
   bAdded=TRUE; |B`-chK  
   KeyCount++; C2<y(GU[Bh  
   break; =V5.c+  
  } .yTk/x ?  
 } h!K B%4V  
 return bAdded; IJ4"X#Q/  
} sTG+c E  
//删除热键 2zFdKs,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Qmn5umd=?\  
{ WP]<\_r2  
 BOOL bRemoved=FALSE; l7s=b4}c  
 for(int index=0;index<MAX_KEY;index++){ k 5"3*  
  if(hCallWnd[index]==hWnd){ Ka_UVKwMro  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ T@yH. 4D  
    hCallWnd[index]=NULL; ;g*X.d  
    HotKey[index]=0; VdeK~#k  
    HotKeyMask[index]=0; $#RD3#=?u  
    bRemoved=TRUE; ~Y'e1w$`  
    KeyCount--; m6;Xo}^w  
    break; ~|uCZ.;o  
   } w|L~+   
  } !'{j"tv  
 } ?G?=,tV  
 return bRemoved; 2M&4]d  
} K6Gc)jp:b  
,6M-xSDs  
A^K,[8VX  
  DLL中的钩子函数如下: M%B[>pONb7  
d:pp,N~2o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) h.?[1hT4R  
{ "L8V!M_e  
 BOOL bProcessed=FALSE; \B}W(^\wg;  
 if(HC_ACTION==nCode) c<D Yk f  
 { Ra{B8)Q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 k oHY AF  
   switch(wParam) @\"*Z&]8z0  
   {   g u|;C  
    case VK_MENU: _O!D*=I  
     MaskBits&=~ALTBIT; "^XN"SUw  
     break; Q}=RG//0*  
    case VK_CONTROL: b8]oI"&G  
     MaskBits&=~CTRLBIT; Ro<!n>H  
     break; eGTK^p  
    case VK_SHIFT: |iwTzlt*#  
     MaskBits&=~SHIFTBIT; g$ 2M|Q  
     break; /vPb  
    default: //judge the key and send message Iyc')\W&  
     break; mefmoZ  
   } `PW=_f={  
   for(int index=0;index<MAX_KEY;index++){ he+[  
    if(hCallWnd[index]==NULL) #>- rKv.A  
     continue; 6VE >$`m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <oXsn.'\  
    { i3%~Gc63  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); W^Rb~b^?  
     bProcessed=TRUE; J.nVEqLZ  
    } H]-W$V   
   } /7lkbL  
  } QE#$bCw  
  else if((lParam&0xc000ffff)==1){ //有键按下 =TP>Y"  
   switch(wParam) [e}]K:  
   { 4O`h%`M  
    case VK_MENU: UpIf t=@P  
     MaskBits|=ALTBIT; u}:O[DG  
     break; XBY"7}  
    case VK_CONTROL: h7y*2:l6  
     MaskBits|=CTRLBIT; YSwD#jO0  
     break; =#^dG ''*"  
    case VK_SHIFT: 0sUc6_>e  
     MaskBits|=SHIFTBIT; 0iL8i#y*  
     break; FRg6-G/S  
    default: //judge the key and send message )F$Stg3e  
     break; 41zeN++  
   } .lFSFJ??  
   for(int index=0;index<MAX_KEY;index++){ IRU2/Ycg  
    if(hCallWnd[index]==NULL) R/wSGP`W  
     continue; s{,e^T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !<LS4s;  
    { <=-\so(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); z<fEJN  
     bProcessed=TRUE; ^KaMi_--  
    } 8;'n.SC{  
   } UA9LI<Y  
  } K$]QzPXS  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 zh.c_>jS  
   for(int index=0;index<MAX_KEY;index++){ lET)<V(Y  
    if(hCallWnd[index]==NULL) P X0#X=$  
     continue; }dHiW:J>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) u#,]>;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4bBxZY  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 9F+bWo_m  
   } >ahj|pm  
  } j41:]6  
 } i\ Vpp8<B  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); NN:TT\!v  
} ;MMFF{  
</=PN1=A  
  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: c[y8"M5  
1v4kN -  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wtUG2 (  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OL'=a|g|c  
L%0lX$2&\  
  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: OKqpc;y:D  
0?7uqS#L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) LF~#4)B  
{ sZH7 EK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~"mZ0 E  
 { II8nz[s  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 9y4rw]4zI  
  SaveBmp(); (=/F=,w   
  return FALSE; v wyDY%B"n  
 } :=Q|gRTL*  
 …… //其它处理及默认处理 +)@>60y  
} Pc7: hu  
nAg(lNOWN  
zoJ;5a.3B  
  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。 $"8k|^Z3  
w!}1oy  
  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。 6a?y $+pr  
(*RybKoaA  
  二、编程步骤 *X\c $ =*  
W.|6$hRl)  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; LasH[:QQQ  
r$F]e]Ic\  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; p.9v<I%0  
y]l"u=$Tr{  
  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; <J)A_Kx[57  
2mUu3fZ  
  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; _}&]`,s>  
hNle;&*F  
  5、 添加代码,编译运行程序。 JB+pFBeY  
9NP l]iA)  
三、程序代码 Tv$7aVi!  
'oz = {;  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %D r?.e  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #:|Y(,c  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ cDiz!n*.q  
#if _MSC_VER > 1000 +29\'w,  
#pragma once {h"\JI!  
#endif // _MSC_VER > 1000 )DmiN^:  
#ifndef __AFXWIN_H__ B@]7eVo  
#error include 'stdafx.h' before including this file for PCH `I8^QcP  
#endif ymZ/(:3_  
#include "resource.h" // main symbols { +2cRr.  
class CHookApp : public CWinApp o"FiM5L^.  
{ Xa@wN/"F  
 public: (UF!Zb]{  
  CHookApp(); Gme$FWa  
  // Overrides F}]_/cY7B  
  // ClassWizard generated virtual function overrides Q: O>kCDV  
  //{{AFX_VIRTUAL(CHookApp) RfBb{?PP)  
 public: |y% ].y)  
  virtual BOOL InitInstance(); ~TH5>``;gF  
  virtual int ExitInstance(); M0SH-0T;Z  
  //}}AFX_VIRTUAL dz|*n'd  
  //{{AFX_MSG(CHookApp) 0Qp'}_  
  // NOTE - the ClassWizard will add and remove member functions here. pRvs;klf  
  // DO NOT EDIT what you see in these blocks of generated code ! } 4]<P  
  //}}AFX_MSG io{H$  x(  
  DECLARE_MESSAGE_MAP() X`n0b<  
}; cN7z(I0[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); f_!`~`04  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uX +<`3O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !>< %\K  
BOOL InitHotkey(); 3Jm'q,TC  
BOOL UnInit(); mRH]'d lD7  
#endif %^=!s  
"O[76}I+.q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Ue#yDTjc  
#include "stdafx.h" q#&#*6 )B  
#include "hook.h" ,/6:bc:W  
#include <windowsx.h> : W^\ mH  
#ifdef _DEBUG bH/pa#G(  
#define new DEBUG_NEW `4.sy +2  
#undef THIS_FILE Ig3(|{R  
static char THIS_FILE[] = __FILE__; g]<Z]R`  
#endif ` G=L07  
#define MAX_KEY 100 )H9*NB8%  
#define CTRLBIT 0x04 (oitCIV  
#define ALTBIT 0x02 bmVgTm&  
#define SHIFTBIT 0x01 W)!{U(X  
#pragma data_seg("shareddata") 2nU NI U  
HHOOK hHook =NULL; iW@Vw{|i I  
UINT nHookCount =0; Hu9R.[u  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey lF8 dRIav  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT o,Zng4NY  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey O*03PF^  
static int KeyCount =0; ]cqZ!4?_  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @k+G Cf  
#pragma data_seg() ~}IvY?! ;  
HINSTANCE hins; SxZ^ "\H  
void VerifyWindow(); ]KK ZbEO  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) G 0QXf  
//{{AFX_MSG_MAP(CHookApp) %HF$  
// NOTE - the ClassWizard will add and remove mapping macros here. NhoS7 y(  
// DO NOT EDIT what you see in these blocks of generated code! fuD1U}c  
//}}AFX_MSG_MAP 3y=<w|4F  
END_MESSAGE_MAP() y8hg8J|  
Z!-<rajl  
CHookApp::CHookApp() gZ"{{#:}  
{ >3`ctbe  
 // TODO: add construction code here, r\n h.}s  
 // Place all significant initialization in InitInstance VuMDV6^Z  
} N9=r#![>,  
2v9s@k/k)6  
CHookApp theApp; PyT}}UKj:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "56?/ jF  
{ 2]NAs9aZ  
 BOOL bProcessed=FALSE; gLaO#cQ%  
 if(HC_ACTION==nCode) \8*,&ak%  
 { ,AbKxT f2  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0"^oTmQN  
   switch(wParam) 9U<)_E<y  
   { ah/6;,T  
    case VK_MENU: Hx2j=Q_dw  
     MaskBits&=~ALTBIT; n E,gQHw  
     break; 6Sb'Otw.  
    case VK_CONTROL: Ef`5fgp? S  
     MaskBits&=~CTRLBIT; ]EM)_:tRf  
     break; +:"6`um|  
    case VK_SHIFT: *lerPY3 q  
     MaskBits&=~SHIFTBIT; ^[seK)S=  
     break; r$r&4d Y  
    default: //judge the key and send message k~jKJb-_  
     break; L_gsG|xX  
   } aC,vh1")F  
   for(int index=0;index<MAX_KEY;index++){ < k+fKl  
    if(hCallWnd[index]==NULL) e.}3OK  
     continue; *mQDS.'AB@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RC8)f8n  
    { ^KZAYB9C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^?6 W<  
     bProcessed=TRUE; {rb-DB-/5M  
    } q3x;_y^  
   } Q}Ze-JIL$  
  } Ie2w0Cs28  
  else if((lParam&0xc000ffff)==1){ //Key down => uVp  
   switch(wParam) ~t${=o430  
   { }r~v,KDb  
    case VK_MENU: }+dM1O  
     MaskBits|=ALTBIT; 5S\][;u  
     break; wI@zPVY_i  
    case VK_CONTROL: w(V? N'[  
     MaskBits|=CTRLBIT; Ql q#Zdru  
     break; W. J:.|kt  
    case VK_SHIFT: ?79SPp)oo  
     MaskBits|=SHIFTBIT; !qTpQ5Dm  
     break; n~,]KdU]  
    default: //judge the key and send message 8sR  
     break; UU.mdSL  
   } 0r0\b*r  
   for(int index=0;index<MAX_KEY;index++) <t[Z9s$n  
   { W>?f^C!+m  
    if(hCallWnd[index]==NULL) F8uRT&m B0  
     continue; [>$\s=` h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aT?p>  
    { y/X:=d6"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -t%{"y  
     bProcessed=TRUE; Iuu<2#gb8"  
    } 4T==A#Z  
   } uG=t?C6  
  } ^ J#?hHz  
  if(!bProcessed){ ;/?Z<[B  
   for(int index=0;index<MAX_KEY;index++){ >}<29Ii  
    if(hCallWnd[index]==NULL) |t&G&)~:  
     continue; yfM>8"h@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V6@*\+:3)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); DMAf^.,S  
   } 6z9R1&~%  
  } nc3ltT,R  
 } -uv 9(r\P  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Sl. KLc@@  
} Vq3]7l  
60hNCVq%  
BOOL InitHotkey() P\q<d  
{ ?qf:_G  
 if(hHook!=NULL){ =E [4H  
  nHookCount++; :(bdI]  
  return TRUE; 3{Na ZIk  
 } 2 ?Pt Z  
 else Q$xa  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); _l24Ba$F6  
  if(hHook!=NULL) }g>dn  
   nHookCount++; c y=I0  
  return (hHook!=NULL); 7oZ@<QP'  
} Mvy6"Q:  
BOOL UnInit() LN@E\wRw{r  
{ aW0u8Dz  
 if(nHookCount>1){ -Q<z1vz  
  nHookCount--; t(J![wB}  
  return TRUE; OwG6i|q  
 } +={  
 BOOL unhooked = UnhookWindowsHookEx(hHook); aUypt(dv  
 if(unhooked==TRUE){ .mvB99P{<  
  nHookCount=0; :`+|'*b(A  
  hHook=NULL; Smq r q  
 } 9GMH*=3[=  
 return unhooked; hH <6E  
} 94~"U5oQ:  
p!HPp Ef+#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iEiu%T>  
{ W<\kf4Y  
 BOOL bAdded=FALSE; zyaW3th  
 for(int index=0;index<MAX_KEY;index++){ c=b+g+*xd  
  if(hCallWnd[index]==0){ Y brx%  
   hCallWnd[index]=hWnd; :dc"b?Ch  
   HotKey[index]=cKey; GXT]K>LA  
   HotKeyMask[index]=cMask; |. J,8~x  
   bAdded=TRUE; |7svA<<[  
   KeyCount++; BCBEX&0hk{  
   break; X|X4L(i  
  } +dqk 6RE  
 } p//T7r s  
 return bAdded; a$C2}  
} Ho|o,XvLv  
hMNJ'i}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Wyy^gJl  
{ k0H?9Z4k5  
 BOOL bRemoved=FALSE; NFB *1_m  
 for(int index=0;index<MAX_KEY;index++){ ;M}itM  
  if(hCallWnd[index]==hWnd){ H"#)&a7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1pd 9s8CA  
    hCallWnd[index]=NULL; ooTc/QEYi  
    HotKey[index]=0; #,@bxsB  
    HotKeyMask[index]=0; tl DY k  
    bRemoved=TRUE; 3.Ji5~  
    KeyCount--; Oq*n9V  
    break; rlR !&  
   } xLA~1ZSVJw  
  } nYOY"'z  
 } WHp97S'd  
 return bRemoved; TNh=4xQ}  
} ^ Xm/  
X.s*>'  
void VerifyWindow() yt. f!"  
{ 9GO}&7   
 for(int i=0;i<MAX_KEY;i++){ '#O;mBPNi  
  if(hCallWnd!=NULL){ 3Bejp+xX  
   if(!IsWindow(hCallWnd)){ A/!<kp{S  
    hCallWnd=NULL;  ci`zR9Ks  
    HotKey=0; ~ct2`M$TL(  
    HotKeyMask=0; 0z<H(|  
    KeyCount--; Rb)|66&3&  
   } i*X{^A73"  
  } Y^ QKp"  
 } As0 B\  
} d'ZS;l   
Tak t_N  
BOOL CHookApp::InitInstance() A'Gl Cp  
{ G;/Q>V  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); YnSbw3U.I  
 hins=AfxGetInstanceHandle(); 5QAdcEcN@O  
 InitHotkey(); 0Y7$d`  
 return CWinApp::InitInstance(); B1E$v(P3M  
} '0Lov]L  
nt=x]wEC  
int CHookApp::ExitInstance() Vr 8:nP:  
{ a>U6Ag<  
 VerifyWindow(); ,"B?_d6  
 UnInit(); (4~X}:  
 return CWinApp::ExitInstance(); Mal<iNN  
} qB:AkMd&  
tmp6hB  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file bMsECA&  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8q0I:SJy  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ y=w`w>%  
#if _MSC_VER > 1000 (z/jMMms  
#pragma once j?xk&  
#endif // _MSC_VER > 1000 D z@1rc<B  
\SOeTn+  
class CCaptureDlg : public CDialog S`=n&'  
{ hd5$yU5JQ  
 // Construction IhE9snJ[  
 public: (VyA6a8  
  BOOL bTray; T '.[F  
  BOOL bRegistered; rIVvO  
  BOOL RegisterHotkey(); )Ob]T{GY  
  UCHAR cKey; X'f)7RbT  
  UCHAR cMask; \b$<J.3  
  void DeleteIcon(); :s"2Da3B  
  void AddIcon(); wZ jlHe  
  UINT nCount; fp{G|.SA  
  void SaveBmp(); 8.yCA  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor c_#*mA"+  
  // Dialog Data Rv<L#!; t  
  //{{AFX_DATA(CCaptureDlg) ^2E hlK^)  
  enum { IDD = IDD_CAPTURE_DIALOG }; }%$OU =T  
  CComboBox m_Key; ?KB@Zm+#~  
  BOOL m_bControl; A d/($v5+  
  BOOL m_bAlt; xI?0N<'.*q  
  BOOL m_bShift; eRs&iK2y  
  CString m_Path; _8^0!,j  
  CString m_Number; qp>N^)>  
  //}}AFX_DATA 4d`+CD C  
  // ClassWizard generated virtual function overrides  D,Lp|V  
  //{{AFX_VIRTUAL(CCaptureDlg) n?:2.S.8  
 public: ]v\^&7pW  
  virtual BOOL PreTranslateMessage(MSG* pMsg); - IU4#s  
 protected: mw4JQ\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?ok)>P  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); eLV.qLBUs  
  //}}AFX_VIRTUAL #dxvz^2V.3  
  // Implementation s]Gd-j  
 protected: .*Vkua  
  HICON m_hIcon; B`{mdjMy  
  // Generated message map functions DtI$9`~  
  //{{AFX_MSG(CCaptureDlg) > aG=T{  
  virtual BOOL OnInitDialog(); +AoP{ x$Ia  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); U; U08/y  
  afx_msg void OnPaint(); g*y/j]  
  afx_msg HCURSOR OnQueryDragIcon(); O9^T3~x[V  
  virtual void OnCancel(); "Zcu[2,  
  afx_msg void OnAbout(); >3PMnI  
  afx_msg void OnBrowse(); ^"x<)@X  
  afx_msg void OnChange(); $7NCb7%/L  
 //}}AFX_MSG *~2cG;B"e  
 DECLARE_MESSAGE_MAP() ;7Okyj6EP  
}; uw33:G  
#endif t'g^W  
mb1Vu  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file % 5z gd>  
#include "stdafx.h" DnFjEP^  
#include "Capture.h" mI"D(bx\  
#include "CaptureDlg.h" ` 1+%}}!$u  
#include <windowsx.h> SkHYXe"]  
#pragma comment(lib,"hook.lib") {x {H$f  
#ifdef _DEBUG #{*LvI&  
#define new DEBUG_NEW =7 w>wW-  
#undef THIS_FILE Fp%Ln(/m  
static char THIS_FILE[] = __FILE__; gn)R^  
#endif !D:Jbt@R<n  
#define IDM_SHELL WM_USER+1 S!h Xf|*0[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0%<+J;'o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !E0!-UpY  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ag 8`O&+  
class CAboutDlg : public CDialog aSL6zye ,  
{ $UvPo0{  
 public: `/4:I  
  CAboutDlg(); uel{`T[S  
  // Dialog Data YQd:M%$  
  //{{AFX_DATA(CAboutDlg) wL3,g2-L  
  enum { IDD = IDD_ABOUTBOX }; $a(`ve|  
  //}}AFX_DATA 1~\M!SQ)  
  // ClassWizard generated virtual function overrides >c~RI7uu  
  //{{AFX_VIRTUAL(CAboutDlg) m`}{V5;  
 protected: xu\eXx6H  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z9DcnAs  
  //}}AFX_VIRTUAL x2W#ROfg  
  // Implementation $1Z6\G O  
 protected: ;:]\KJm}?  
  //{{AFX_MSG(CAboutDlg) cyQBqG  
  //}}AFX_MSG =a$Oecg?  
  DECLARE_MESSAGE_MAP() }k7'"`#?"  
}; ->gZ)?Fqy  
vzXag*0  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) YGk9b+`  
{ %8r/oS  
 //{{AFX_DATA_INIT(CAboutDlg) hXB|g[zT  
 //}}AFX_DATA_INIT .L EY=j!-s  
} 8-M e.2K  
jfp z`zE  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) qP1FJ89H  
{ wK!~tYxP  
 CDialog::DoDataExchange(pDX); h|)vv4-d|  
 //{{AFX_DATA_MAP(CAboutDlg) lV6dm=k  
 //}}AFX_DATA_MAP 2SG$LIV 9Y  
} J7+w4q~cB`  
BKIjNV3  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Riry_   
 //{{AFX_MSG_MAP(CAboutDlg) O!&,5Dy  
 // No message handlers vmX"+sHz$]  
 //}}AFX_MSG_MAP L0NA*C   
END_MESSAGE_MAP() fU+Pn@'  
,6,]#R :J  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) m3.sVI0I  
: CDialog(CCaptureDlg::IDD, pParent) Q(Gl{#b  
{ t ls60h  
 //{{AFX_DATA_INIT(CCaptureDlg) 1m@^E:w  
  m_bControl = FALSE; 9 OT,TpA  
  m_bAlt = FALSE; N#ioJ^}n:  
  m_bShift = FALSE; eQDX:b  
  m_Path = _T("c:\\"); 3EK9,:<Cf  
  m_Number = _T("0 picture captured."); u2iXJmM*  
  nCount=0; s'\$t  
  bRegistered=FALSE; W?Ww2Lo%Y  
  bTray=FALSE; >:1P/U  
 //}}AFX_DATA_INIT RU#F8O  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 1/Zh^foG  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); se9>.}zZN  
} j !H^-d}q  
sa&) #Z:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) bC6oqF'#  
{ 9`B$V##-L  
 CDialog::DoDataExchange(pDX); T+IF}4e d  
 //{{AFX_DATA_MAP(CCaptureDlg) /)L 0`:I#  
  DDX_Control(pDX, IDC_KEY, m_Key); rcN 9.1  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _NZ@4+aW  
  DDX_Check(pDX, IDC_ALT, m_bAlt); `{Tk@A_yd  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); p/ GVTf  
  DDX_Text(pDX, IDC_PATH, m_Path); bPbb\|u0d  
  DDX_Text(pDX, IDC_NUMBER, m_Number); '{b1!nC;  
 //}}AFX_DATA_MAP s60 TxB  
} L{fFC%|l2L  
q_[G1&MC  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O XP\R  
//{{AFX_MSG_MAP(CCaptureDlg) g(4bBa9y  
 ON_WM_SYSCOMMAND() gVR@&bi7  
 ON_WM_PAINT() v|';!p|  
 ON_WM_QUERYDRAGICON() #UP~iHbt\  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Ea $aUORm  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) WT\<.Py  
 ON_BN_CLICKED(ID_CHANGE, OnChange) YN/ }9.  
//}}AFX_MSG_MAP [g|Y7.j8  
END_MESSAGE_MAP() Rl~T$ Ey  
60>.ul2  
BOOL CCaptureDlg::OnInitDialog() {y)s.b~JB  
{ EcL-V>U# M  
 CDialog::OnInitDialog(); ]d}0l6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9pKGr@&   
 ASSERT(IDM_ABOUTBOX < 0xF000); 5Wx~ZQZ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); aHzHvl  
 if (pSysMenu != NULL) b;cMl'  
 { E%N2k|%8d_  
  CString strAboutMenu; zZ-\a[F  
  strAboutMenu.LoadString(IDS_ABOUTBOX); o4y']JSN  
  if (!strAboutMenu.IsEmpty()) ~FU@wV^   
  { d^E [|w ;  
   pSysMenu->AppendMenu(MF_SEPARATOR); /0MDISQy9  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *# {z3{+  
  } z(y*hazK  
 } Di.3113t  
 SetIcon(m_hIcon, TRUE); // Set big icon Xd `vDgD  
 SetIcon(m_hIcon, FALSE); // Set small icon $A_]:qI2  
 m_Key.SetCurSel(0); <If35Z)~  
 RegisterHotkey(); nw:-J1kWR  
 CMenu* pMenu=GetSystemMenu(FALSE); <.K4JlbT  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9LJZ-/Wq  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); YX*x&5]lq  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8+Llx  
 return TRUE; // return TRUE unless you set the focus to a control c3%@Wj:fo  
} `{v?6:G:Q  
BqK(DH^9N  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !~i' -4]  
{ i]{1^pKq  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3>M&D20Z  
 { !U%T&?E l  
  CAboutDlg dlgAbout; :iWS\G^ U  
  dlgAbout.DoModal(); fh8j2S9J  
 } s"KJiQKGM  
 else ),:c+~@@kT  
 { Gbpw5n;e  
  CDialog::OnSysCommand(nID, lParam); rZXrT}Xh{W  
 } 2S[-$9  
} 5Qwh(C^H  
AM"jX"F9/  
void CCaptureDlg::OnPaint() Io`P,l:  
{ qy1F* kY  
 if (IsIconic()) &<TzG B*  
 { O Wp%v_y]  
  CPaintDC dc(this); // device context for painting 4bVO9aUG{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <6TT)t<h  
  // Center icon in client rectangle 2-*V=El  
  int cxIcon = GetSystemMetrics(SM_CXICON); q/9H..6  
  int cyIcon = GetSystemMetrics(SM_CYICON); ^ <`(lyph  
  CRect rect; Jb_1LZ) ]  
  GetClientRect(&rect); `O?T.p)   
  int x = (rect.Width() - cxIcon + 1) / 2; Uh eC  
  int y = (rect.Height() - cyIcon + 1) / 2; oTjyN\?H  
  // Draw the icon Z6C=T;w  
  dc.DrawIcon(x, y, m_hIcon); uQ$^;Pr  
 } {@Yb%{+  
 else B_`y|sn  
 { IA zZ1#/3  
  CDialog::OnPaint(); +gd2|`#  
 } NH<gU_s8{9  
} qVqRf.-\  
u|#>32kV  
HCURSOR CCaptureDlg::OnQueryDragIcon() 4LcX<B U9  
{ RprKm'b8x`  
 return (HCURSOR) m_hIcon; /'2O.d0}.  
} ) /vhclkb  
8F(h*e_?  
void CCaptureDlg::OnCancel() ocbB&  
{ uP3_FX: e  
 if(bTray) ^)!F9h+  
  DeleteIcon(); w>fdQ!RdP  
  CDialog::OnCancel(); /PBaIoJE  
} eK_*2=;XRW  
Qp,DL@mp>8  
void CCaptureDlg::OnAbout() =;a!u  
{ 7tM9u5FF  
 CAboutDlg dlg; [S]S^ej*8  
 dlg.DoModal(); sxKf&p;  
} b+-f.!j  
 MTER(L  
void CCaptureDlg::OnBrowse() @oF$LMD  
{ hf/2vt m  
 CString str; HW4 .zw  
 BROWSEINFO bi; WO4=Mte?  
 char name[MAX_PATH]; =\#%j|9N9  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); %D$,;{ew  
 bi.hwndOwner=GetSafeHwnd(); `i) 2nNJ"  
 bi.pszDisplayName=name; c3*t_!@oC  
 bi.lpszTitle="Select folder"; ,r^M?>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; EFuvp8^y  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); >h2%[j=  
 if(idl==NULL) uJHu>M}~  
  return; v[@c*wo  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 87)zCq  
 str.ReleaseBuffer(); /){KOCBl;  
 m_Path=str; ,oxcq?7#4  
 if(str.GetAt(str.GetLength()-1)!='\\') "vCM}F  
  m_Path+="\\"; s5.AW8X=?*  
 UpdateData(FALSE); 5erc D  
} !MDNE*_  
(BxJryXm  
void CCaptureDlg::SaveBmp() +MbIB&fRCB  
{ 'bGX-C  
 CDC dc; [XRCLi}  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); l+V,DCE  
 CBitmap bm; QVF]Ci_=  
 int Width=GetSystemMetrics(SM_CXSCREEN); "Td`AuP@,  
 int Height=GetSystemMetrics(SM_CYSCREEN); 4nH*Ui!T  
 bm.CreateCompatibleBitmap(&dc,Width,Height); `-`qdda  
 CDC tdc; R+q"_90_  
 tdc.CreateCompatibleDC(&dc); V}d 9f 2  
 CBitmap*pOld=tdc.SelectObject(&bm); I KtB;  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); s]T""-He  
 tdc.SelectObject(pOld); hUQ,z7-  
 BITMAP btm; CycUeT  
 bm.GetBitmap(&btm); I1X /Lj=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; \T]EZ'+O  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); f\+f o  
 BITMAPINFOHEADER bih; Iz6y{E  
 bih.biBitCount=btm.bmBitsPixel; WwF~d+>|C  
 bih.biClrImportant=0; )15Z#`x  
 bih.biClrUsed=0; ONNpiK-  
 bih.biCompression=0; ,:~0F^z  
 bih.biHeight=btm.bmHeight; 6) oLus  
 bih.biPlanes=1; ; Sd\VR  
 bih.biSize=sizeof(BITMAPINFOHEADER); A7! g  
 bih.biSizeImage=size; 72sD0)?A  
 bih.biWidth=btm.bmWidth; 6C>_a*w  
 bih.biXPelsPerMeter=0; }pk#!N  
 bih.biYPelsPerMeter=0; n9pN6,o+  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1Gt/Tq$_b  
 static int filecount=0; <PPNhf8  
 CString name; I/VxZ8T  
 name.Format("pict%04d.bmp",filecount++); D'Z|}(d&  
 name=m_Path+name; l no vykR  
 BITMAPFILEHEADER bfh; ;U1UFqZ`  
 bfh.bfReserved1=bfh.bfReserved2=0; 6{[pou&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Am8x74?  
 bfh.bfSize=54+size; [s9O0i" Y  
 bfh.bfOffBits=54; @prG%vb"  
 CFile bf; 9_\'LJ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6.5T/D*TT  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {X2`&<i6  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); _|72r} j  
  bf.WriteHuge(lpData,size); 2f U$J>Y  
  bf.Close(); !zPG? q]3  
  nCount++; {T"0DSV   
 } h2ZkCML  
 GlobalFreePtr(lpData); KZ!3j_pKy  
 if(nCount==1) nd;fy$<J\  
  m_Number.Format("%d picture captured.",nCount); d!KsNkk  
 else 1Z[/KJ  
  m_Number.Format("%d pictures captured.",nCount); +(xeT+J  
  UpdateData(FALSE); vA$o~?a]/  
} 7'wS\/e4a  
rC:?l(8ng3  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) S$f6a'  
{ Q0Nyqhvi  
 if(pMsg -> message == WM_KEYDOWN) )uv=S;+  
 { _3]][a,  
  if(pMsg -> wParam == VK_ESCAPE) {_(\` >  
   return TRUE; as=m`DqOh  
  if(pMsg -> wParam == VK_RETURN) ?[*0+h`en  
   return TRUE; &t5{J53  
 } !-m&U4Ku6o  
 return CDialog::PreTranslateMessage(pMsg); 7&KT0a*  
} '(f/~"9B  
x^"E S%*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ladsw  
{ Xtwun  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ axHK_1N{  
  SaveBmp(); ]$U xCu  
  return FALSE; 0y<wvLv2C  
} 7W6cM%_B  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ R*|LI  
 CMenu pop; V\V)<BARe  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \4"S7.% |  
 CMenu*pMenu=pop.GetSubMenu(0); `@i5i((  
 pMenu->SetDefaultItem(ID_EXITICON); [1Ydo`  
 CPoint pt; A2}Rl%+X]6  
 GetCursorPos(&pt); MNH1D! }  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Y(\T- bI  
 if(id==ID_EXITICON) jjJ2>3avY  
  DeleteIcon(); 0Ok,oW {  
 else if(id==ID_EXIT) Qb8KPpd  
  OnCancel(); +0),xu  
 return FALSE; ;['[?wk  
} 0&ByEN9 9  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); I@Xn3oN  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) O]f/r,4@  
 AddIcon(); \rykBxs  
 return res; mMMQ|ea  
} E;21?`x5  
#,{+3Y&5-+  
void CCaptureDlg::AddIcon() ^m_yf|D$  
{ Hi_ G  
 NOTIFYICONDATA data; bCZ g cN  
 data.cbSize=sizeof(NOTIFYICONDATA); $A3<G-4O  
 CString tip; i{D=l7j|w  
 tip.LoadString(IDS_ICONTIP); do uc('@  
 data.hIcon=GetIcon(0); XC7%vDIt  
 data.hWnd=GetSafeHwnd(); B2Xn?i3 l  
 strcpy(data.szTip,tip); *m%]zj0bo  
 data.uCallbackMessage=IDM_SHELL; $+}+zZX5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  FgL,k  
 data.uID=98; +n}$pM|NKU  
 Shell_NotifyIcon(NIM_ADD,&data); nW "q  
 ShowWindow(SW_HIDE); y*{Zbz#{  
 bTray=TRUE; Rl|4S[  
} Y!6/[<r$~k  
s4_/&h  
void CCaptureDlg::DeleteIcon() ?PTk1sB  
{ 3]-_q"Co4f  
 NOTIFYICONDATA data; `nUO l  
 data.cbSize=sizeof(NOTIFYICONDATA); rbT)=-(  
 data.hWnd=GetSafeHwnd(); p;?*}xa  
 data.uID=98; PpLU  
 Shell_NotifyIcon(NIM_DELETE,&data); [sW.CK= 3  
 ShowWindow(SW_SHOW); Og;-B0,A  
 SetForegroundWindow(); Sx    
 ShowWindow(SW_SHOWNORMAL); #d{=\$=  
 bTray=FALSE; G8W#<1LE  
} RtG}h[k/X  
^I KO2Ft  
void CCaptureDlg::OnChange() `IYuz:  
{  p0.|<  
 RegisterHotkey(); KYJjwXT28W  
} ~) ?  
fjnTe  
BOOL CCaptureDlg::RegisterHotkey()  `[zQf  
{ GRy-+#,b"  
 UpdateData(); =66Nw(E.  
 UCHAR mask=0; {{C`mgC  
 UCHAR key=0; ::n;VY2&  
 if(m_bControl) P,ua<B}L  
  mask|=4; bslrqUk_`=  
 if(m_bAlt) ^$%Z! uz  
  mask|=2; )Qm[[pnj  
 if(m_bShift) g<*BLF  
  mask|=1; )XQ`M?**M  
  key=Key_Table[m_Key.GetCurSel()]; ? muzU.h"z  
 if(bRegistered){ 5unG#szq  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); g~UUP4<$"  
  bRegistered=FALSE; 4h6k`ie!$  
 } 5 ,0d  
 cMask=mask; `RMI(zI3g.  
 cKey=key; I2(zxq&2M\  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3Rm#-T s  
 return bRegistered; d2X[(3  
} V8=Y@T,  
C8a*Q"  
  四、小结 D 71;&G]0  
( *G\g=D  
  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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