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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: ~8t}*oV   
  NP`s[  
  一、实现方法 q7&yb.<KD.  
I#t9aR+&  
  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: H ?j-=Zka  
9>3Ltnn0  
#pragma data_seg("shareddata") U;{,lS2l  
HHOOK hHook =NULL; //钩子句柄 MQ(/l_=zQ  
UINT nHookCount =0; //挂接的程序数目 W8$=a  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 mN{ajf)@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 B" m:<@ "  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Kxc$wN<  
static int KeyCount =0; 8TZA T%4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ; axa ZV  
#pragma data_seg() xd fvme[  
X/-KkC  
  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。 ZBR^[OXO  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: tH,K\v`f  
~,!hE&LE~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR _8li4;F  
cKey,UCHAR cMask) Mc7<[a  
{ |M<.O~|D6}  
 BOOL bAdded=FALSE; *{dD'9Bg  
 for(int index=0;index<MAX_KEY;index++){ d50IAa^p6J  
  if(hCallWnd[index]==0){ M.:@<S  
   hCallWnd[index]=hWnd; x_y>j)  
   HotKey[index]=cKey; l8xd73D)8  
   HotKeyMask[index]=cMask; "1!.^<V*  
   bAdded=TRUE; Da8$Is;n  
   KeyCount++;  K-5"#  
   break; 9`C iE  
  } B:- KZuO  
 } |369@un6  
 return bAdded; ?PE1aB+{:  
} IEoR7:  
//删除热键 >9tkx/J  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >\7RIy3  
{ EkStb#  
 BOOL bRemoved=FALSE; 3]`qnSYBv  
 for(int index=0;index<MAX_KEY;index++){ "UoCT7X  
  if(hCallWnd[index]==hWnd){ )fd-IYi-3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Rhv".epz  
    hCallWnd[index]=NULL; 0Dm`Ek3A7x  
    HotKey[index]=0; ! jX+ox  
    HotKeyMask[index]=0; :*P___S=  
    bRemoved=TRUE; oyN+pFVB:$  
    KeyCount--; W|H4i;u  
    break; ay:\P.`5)  
   } {`K]sa7`  
  } [wy3Ld  
 } m>uI\OY{n  
 return bRemoved; Tc3ih~LvG  
} iTugvb  
<S8I"8{Mb  
*M5$ h*;v  
  DLL中的钩子函数如下: SEQO2`]e:  
bm tJU3Rm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) X[~f:E[1J  
{ *]:G7SW{  
 BOOL bProcessed=FALSE; N}+B:l]Qy  
 if(HC_ACTION==nCode) K*Nb_|~  
 { `z$uw  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 v;bM.OL  
   switch(wParam) RRI>bh]  
   {  EAC(^+15K  
    case VK_MENU: nF. ;LM  
     MaskBits&=~ALTBIT; yo?g"vbE  
     break; U| 41u4)D  
    case VK_CONTROL: 0K$WSGB?6j  
     MaskBits&=~CTRLBIT; UYcyk $da  
     break; 2yJ7]+Jd7Y  
    case VK_SHIFT: KtfkE\KP  
     MaskBits&=~SHIFTBIT; 3)C6OF>7  
     break; nz&b5Xb2  
    default: //judge the key and send message xyS2_Q  
     break; 8V=HyF#  
   } v E3{H  
   for(int index=0;index<MAX_KEY;index++){ f>s#Ngvc  
    if(hCallWnd[index]==NULL) KMpDlit  
     continue; np`g cj#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;Z!~A"~$>  
    {  '{j\0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); NWQPOq#  
     bProcessed=TRUE; p-T~x$"c|  
    } m0BG9~p|  
   } de=5=>P7  
  } ^^4K/XBve  
  else if((lParam&0xc000ffff)==1){ //有键按下 2\nBqCxR  
   switch(wParam) {hs2?#p  
   { |i} +t  
    case VK_MENU: 8g# c%eZ  
     MaskBits|=ALTBIT; mJGO)u&  
     break; V(lK`dY  
    case VK_CONTROL: GG@I!2,_  
     MaskBits|=CTRLBIT; gfdPx:7^  
     break; t3  uB  
    case VK_SHIFT: [Q7->Wo|S:  
     MaskBits|=SHIFTBIT; k lP{yxU'n  
     break; xI`Uk8-8  
    default: //judge the key and send message |iwM9oO%  
     break; -+ ]T77r  
   } jlRl2 #"  
   for(int index=0;index<MAX_KEY;index++){ @sB}q 6>  
    if(hCallWnd[index]==NULL) Qb6QXjN Q  
     continue; ?;:9 W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8(vC jL  
    { 7GBZA=J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q>}e IQ Y  
     bProcessed=TRUE; A=v lC?&Z  
    } j{Yt70Wv  
   } jpYw#]Q  
  } fH#F"^ A  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <?> I\  
   for(int index=0;index<MAX_KEY;index++){ c]s (u+i  
    if(hCallWnd[index]==NULL) dDv{9D,  
     continue; r%g <h T 8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E(aX4^]g  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =1{H Sf  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 7X9+Qj;  
   } o ;[C(OS  
  } YiIddQ  
 } ;1{iF2jZ:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %Lh-aP{[e  
} u|_LR5S!j  
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  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: RlI W&y  
e/]O<,*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dJdD"xj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D_l/Gxdpr  
LCo1{wi  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: QmWC2$b  
/32Ta  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) AI^AK0.L  
{ oTq%wi6 _  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) W\I$`gyC/  
 { 4)z3X\u|Z2  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 i#L6UKe:Q  
  SaveBmp(); _9Dn \=g  
  return FALSE; " jl1.Ah  
 } {&\J)oZ  
 …… //其它处理及默认处理 X;s 3y{ku  
} )^jQkfL  
~=`f]IL  
[ E$$nNs  
  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。 zVp[YOS&c  
FSW3'  
  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。 o-\ok|,)#j  
"?oo\op  
  二、编程步骤 8eOl@}bV  
(,- 5(fW  
  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"; g2[K<  
cOzg/~\1  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; *fxep08B  
q*HAIw[<y  
  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; lEO?kn.:z  
S2koXg(  
  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; vbr~<JT=  
 'P@=/  
  5、 添加代码,编译运行程序。 ucQezmie  
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三、程序代码 (A7T}znG  
M*g2VyZ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $x;tSJ)m~  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) i:l80 GK  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ httls>:xB|  
#if _MSC_VER > 1000 y-E1]4?})  
#pragma once S[-.tvI;Q  
#endif // _MSC_VER > 1000 7,pjej  
#ifndef __AFXWIN_H__ pu\b`3C(  
#error include 'stdafx.h' before including this file for PCH Q9` s_4  
#endif 2"T8^r|U  
#include "resource.h" // main symbols ?,WUJH?^  
class CHookApp : public CWinApp &FL%H;Kfx  
{ k)$iK2I  
 public: IL!BPFG w  
  CHookApp(); +<)tql*  
  // Overrides Tx y]"_  
  // ClassWizard generated virtual function overrides M.o?CX'  
  //{{AFX_VIRTUAL(CHookApp) i FC"!23f  
 public: UqD5 A~w  
  virtual BOOL InitInstance(); fdd~e52f  
  virtual int ExitInstance(); NY~ dM\  
  //}}AFX_VIRTUAL "F&Tnhh4  
  //{{AFX_MSG(CHookApp) LTg?5GwD\j  
  // NOTE - the ClassWizard will add and remove member functions here. |C~Sr#6)7  
  // DO NOT EDIT what you see in these blocks of generated code ! l)}<#Ri  
  //}}AFX_MSG /DLr(  
  DECLARE_MESSAGE_MAP() 4qqF v?O[r  
}; x2sN\tOh^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); V^j3y`K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eA`]K alH  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?2H{^\<(e  
BOOL InitHotkey(); 613/K`o  
BOOL UnInit(); {]+ jL1  
#endif TAXd,z N  
F?!FD>L{`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. l>A\ V)  
#include "stdafx.h" 5k K= S  
#include "hook.h" cYsR0#  
#include <windowsx.h> @[n2dmj  
#ifdef _DEBUG gBMta+<fE~  
#define new DEBUG_NEW G=vN;e_$_b  
#undef THIS_FILE g<M0|eX@~  
static char THIS_FILE[] = __FILE__; eT;AAGql  
#endif ?(]a*~rx  
#define MAX_KEY 100 l#b:^3  
#define CTRLBIT 0x04 Vz%"9`r  
#define ALTBIT 0x02 S*;#'j)4+  
#define SHIFTBIT 0x01 >r~0SMQr  
#pragma data_seg("shareddata") j6`6+W=S(  
HHOOK hHook =NULL; a a4$'8s  
UINT nHookCount =0; ! &Z*yH  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ,xYg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 2q12y Y f  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey @=CLeQG`  
static int KeyCount =0; $Xf~# uH  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift &q.)2o#Q.  
#pragma data_seg() O ,l\e 3;  
HINSTANCE hins; x]H3Y3  
void VerifyWindow(); ^GN5vT+:'  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) O2C6V>Q;  
//{{AFX_MSG_MAP(CHookApp) ]OUD5T  
// NOTE - the ClassWizard will add and remove mapping macros here. Xe)Pg)J1  
// DO NOT EDIT what you see in these blocks of generated code! r~I.F!{  
//}}AFX_MSG_MAP RvWFF^,.  
END_MESSAGE_MAP() n:F@gZd`  
VIetcs  
CHookApp::CHookApp() p#)e:/Qy  
{ ,Ak ^nX  
 // TODO: add construction code here, tzZ|S<e6=\  
 // Place all significant initialization in InitInstance 6!@0VI&P  
} Bhj:9%`  
&.hoC Po$  
CHookApp theApp; S 9WawI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2ed@HJu  
{ O!o <P5X^  
 BOOL bProcessed=FALSE; :#qUMiu$  
 if(HC_ACTION==nCode) dZF8 R  
 { \Ph]*%  
  if((lParam&0xc0000000)==0xc0000000){// Key up II&<  
   switch(wParam) E{<?l 7t  
   { "=FIFf  
    case VK_MENU: anLbl#UV  
     MaskBits&=~ALTBIT; FWIih5 3`  
     break; "X`Qe!zk4  
    case VK_CONTROL: wI*Y{J  
     MaskBits&=~CTRLBIT; hX&-/fF+f  
     break; #0(fOHPQ  
    case VK_SHIFT: CK=ARh#|  
     MaskBits&=~SHIFTBIT; Vfb<o"BQk  
     break; /GyEVCc  
    default: //judge the key and send message o94P I*.  
     break; Ohc^d"[7  
   } hRk,vB ]  
   for(int index=0;index<MAX_KEY;index++){ W.IH#`-9E  
    if(hCallWnd[index]==NULL) cFw3Iw"JJ  
     continue; B+|IZoR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %,XI]+d  
    { ^+EMZFjg(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); QJQJR/g  
     bProcessed=TRUE; D_Guc8*  
    } n7@j}Q(&?  
   } @$Yb#$/  
  } rj}(muM,R  
  else if((lParam&0xc000ffff)==1){ //Key down Mg+4huT  
   switch(wParam) - gB{:UYi3  
   { :fhB*SYK  
    case VK_MENU: c+H)ed>  
     MaskBits|=ALTBIT; _g65pxt =Z  
     break; &u("|O)w$  
    case VK_CONTROL: sLNNcj(Cy>  
     MaskBits|=CTRLBIT; H)\4=^  
     break; whw{dfE  
    case VK_SHIFT: v3~FR,Kl  
     MaskBits|=SHIFTBIT; \PzN XQ$  
     break; DDWp4`CS|  
    default: //judge the key and send message [Q|M/|mnR1  
     break; yYg   
   } 5 1"8Py  
   for(int index=0;index<MAX_KEY;index++) 0Lx3]"v  
   { ?H<~ac2e  
    if(hCallWnd[index]==NULL) \d:h$  
     continue; loLKm]yV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }Iip+URG  
    { ,2,W^HJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4AuH1m)<  
     bProcessed=TRUE; O hi D  
    } RU7!U mf  
   } i]dz}=j'  
  } x`#22"m  
  if(!bProcessed){ BK*z 4m  
   for(int index=0;index<MAX_KEY;index++){ moaodmt]x  
    if(hCallWnd[index]==NULL) 1EQvcw #  
     continue; ;KL9oV!<f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \<=IMa0  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &lUNy L  
   } RN vQ  
  } g [AA,@p+  
 } j!7Qw 8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1!d)PK>1$  
} VJ*\pM@no  
JS PW>W"  
BOOL InitHotkey() w1c w1xX*  
{ ",T` \8&@e  
 if(hHook!=NULL){ h^Qh9G0dn  
  nHookCount++; %Sul4: D#  
  return TRUE; Nkx0CG*  
 } ' Wtf>`  
 else _Yy:s2I8B  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [t$4Tdd  
  if(hHook!=NULL) v[smQO  
   nHookCount++; VE*j*U j  
  return (hHook!=NULL); xb]o dYGdW  
} V!W1fb7V  
BOOL UnInit() IKo;9|2U  
{ LfHzT<)|  
 if(nHookCount>1){ J$rJd9t  
  nHookCount--; y #69|G  
  return TRUE; <>n9'i1  
 } lJUy;yp_+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); \1]rlzXGUT  
 if(unhooked==TRUE){ W-ez[raY  
  nHookCount=0; _Ds@lVY  
  hHook=NULL; P,U$ %C!  
 } d- h"JZ9  
 return unhooked; t{6ap+%L  
} CIEJql?`  
X5 j=C]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ifvU"l  
{ P2t_T'R}  
 BOOL bAdded=FALSE; E0<)oQ0Xa>  
 for(int index=0;index<MAX_KEY;index++){ "ee'2O  
  if(hCallWnd[index]==0){ 5N1}Ns  
   hCallWnd[index]=hWnd; aLYLd/ KV  
   HotKey[index]=cKey; 'g~@"9'oe  
   HotKeyMask[index]=cMask;   Y<aO  
   bAdded=TRUE; R5gado  
   KeyCount++; dl_{iMhF&E  
   break; u0g*O]Y  
  } %Lyz_2q A  
 } /LF3O~Go  
 return bAdded; C 0>=x{,v  
} fx]eDA|$e  
nc&Jmo7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) HA1]M`&  
{ O) 1E$#~  
 BOOL bRemoved=FALSE; S+iP^*L,c  
 for(int index=0;index<MAX_KEY;index++){ Xo8DEr  
  if(hCallWnd[index]==hWnd){ <}]{~y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ C38%H  
    hCallWnd[index]=NULL; /K@$#x_{  
    HotKey[index]=0; ewym 1}o  
    HotKeyMask[index]=0; eG4>d^`c  
    bRemoved=TRUE; rFfy#e  
    KeyCount--; D'n L  
    break; &wb9_? ir-  
   } [Y$V\h=V  
  } 1AT'S;`  
 } rH.gF43O:  
 return bRemoved; c|Y!c!9F  
} _Z.cMYN  
{-h, ZdH^  
void VerifyWindow() fnWsm4  
{ LN\[Tmd &  
 for(int i=0;i<MAX_KEY;i++){ ;y OD  
  if(hCallWnd!=NULL){ M J\r 4n  
   if(!IsWindow(hCallWnd)){ +sRP<as  
    hCallWnd=NULL; Fg4@On[,i  
    HotKey=0; .it2NS  
    HotKeyMask=0; 'in@9XO  
    KeyCount--; kW +G1|  
   } ).Gd1pE  
  } :3 y_mf>  
 } $kl$D"*0  
} h R~v  
??(Kwtx{  
BOOL CHookApp::InitInstance() LipxAE?O  
{ # 66e@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >XnO&hW  
 hins=AfxGetInstanceHandle(); Um\0i;7 ~4  
 InitHotkey(); 8U=A{{0p  
 return CWinApp::InitInstance(); ;cLUnsB\  
} 6__K#r  
3S;N(A4  
int CHookApp::ExitInstance() cix36MR_  
{ akCIa'>t  
 VerifyWindow(); (u9Zk~)F  
 UnInit(); :XYy7xz<  
 return CWinApp::ExitInstance(); JGgxAd{L  
} B9^R8|V  
jA<T p}$!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file lhxdx    
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) s!de2z  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 8lb-}=  
#if _MSC_VER > 1000 <xqba4O  
#pragma once { 8p\Y  
#endif // _MSC_VER > 1000 >0T Za  
SX_4=^  
class CCaptureDlg : public CDialog H(&Z:{L  
{ e T-9  
 // Construction {(Fe7,.S3  
 public: t !~ S9c  
  BOOL bTray; + Kk@Q  
  BOOL bRegistered; u|OtKq  
  BOOL RegisterHotkey(); :1MM a6  
  UCHAR cKey; .`J:xL%Z  
  UCHAR cMask; GO~k '  
  void DeleteIcon(); gl "_:atW  
  void AddIcon(); " '[hr$h3  
  UINT nCount; }dKLMNqPA  
  void SaveBmp(); xqv[? ?  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .Q[yD<)Ubs  
  // Dialog Data F. T@)7  
  //{{AFX_DATA(CCaptureDlg) )5GQJiY  
  enum { IDD = IDD_CAPTURE_DIALOG }; 1.0J2nZpt  
  CComboBox m_Key; { i;6vRr  
  BOOL m_bControl; 7"K^H]6u30  
  BOOL m_bAlt; aS/`A  
  BOOL m_bShift; mp:m`sh*i  
  CString m_Path; L;yEz[#xaT  
  CString m_Number; /[?Jylj  
  //}}AFX_DATA  d1bhJK  
  // ClassWizard generated virtual function overrides w+=Q6]FxJ  
  //{{AFX_VIRTUAL(CCaptureDlg) [b;Uz|o  
 public: -l[jEJS}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); (}jL_E  
 protected: <+q$XL0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support enumK\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _-TOeP8#94  
  //}}AFX_VIRTUAL HsH <m j  
  // Implementation HH zEQV Lh  
 protected:  5~s{N  
  HICON m_hIcon; s.rT]  
  // Generated message map functions ;($1Z7j+  
  //{{AFX_MSG(CCaptureDlg) wT/6aJoX  
  virtual BOOL OnInitDialog(); ]/44Ygz/  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); iRs V#s  
  afx_msg void OnPaint(); Bc[6*Y,%T  
  afx_msg HCURSOR OnQueryDragIcon(); M2p<u-6 "  
  virtual void OnCancel(); [pR)@$"k'  
  afx_msg void OnAbout(); "teyi"U+  
  afx_msg void OnBrowse(); X+at%L=  
  afx_msg void OnChange(); '=#5(O%pp  
 //}}AFX_MSG Ux_<d?p  
 DECLARE_MESSAGE_MAP() xYwkFB$$*  
}; `xIh\q  
#endif tW(+xu36  
)eq}MaW+j  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `Cg^in\  
#include "stdafx.h" !tBeuemN%  
#include "Capture.h" r<|nwFJ  
#include "CaptureDlg.h" NjP ]My  
#include <windowsx.h> :o$@F-$k  
#pragma comment(lib,"hook.lib") t'aSF{%  
#ifdef _DEBUG "kr,x3 =  
#define new DEBUG_NEW w_3xKnMT\  
#undef THIS_FILE g ;LVECk  
static char THIS_FILE[] = __FILE__; )!a$#"'  
#endif ^aptLJF  
#define IDM_SHELL WM_USER+1 D'n7&Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b pp*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u~}%1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _:%U_U  
class CAboutDlg : public CDialog !0Nf9  
{ Mj'lASI  
 public: =GTD"*vwr  
  CAboutDlg(); _[JkJwPTx  
  // Dialog Data ; 8E;  
  //{{AFX_DATA(CAboutDlg) G_+Ph^  
  enum { IDD = IDD_ABOUTBOX }; :'Xr/| s  
  //}}AFX_DATA S.hC$0vrj  
  // ClassWizard generated virtual function overrides <I 1y  
  //{{AFX_VIRTUAL(CAboutDlg) 045\i[l=  
 protected: n;qz^HXEJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !-RwB@\  
  //}}AFX_VIRTUAL !7c'<[+Hm  
  // Implementation zAI|Jv @  
 protected: b^Z$hnh]S  
  //{{AFX_MSG(CAboutDlg) u G[!w!e  
  //}}AFX_MSG P&\X`ZUA  
  DECLARE_MESSAGE_MAP() *%?d\8d  
}; Cya5*U0=  
3 Ta>Ki  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) HEpM4xe$  
{ 8Z!*[c>K-?  
 //{{AFX_DATA_INIT(CAboutDlg) =)*JbwQ   
 //}}AFX_DATA_INIT .+vd6Uc5a  
} XNlhu^jh  
C fSl 54  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) T<M?PlED  
{ 9gR.RwR X  
 CDialog::DoDataExchange(pDX); !o<ICHHH  
 //{{AFX_DATA_MAP(CAboutDlg) u}m.}Mws  
 //}}AFX_DATA_MAP :MBS>owR  
} >b43%^yii  
y1u9 B;Fd  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?@3&dk~ni  
 //{{AFX_MSG_MAP(CAboutDlg) zp#:EZ  
 // No message handlers B.6`cM^  
 //}}AFX_MSG_MAP phS>T  
END_MESSAGE_MAP() ]v GgJ<  
@?d?e+B  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) LfllO  
: CDialog(CCaptureDlg::IDD, pParent) (Y)!"_|  
{ Y'JL(~|  
 //{{AFX_DATA_INIT(CCaptureDlg) |!xpYT:  
  m_bControl = FALSE; KGQC't  
  m_bAlt = FALSE; Xy!&^C` J`  
  m_bShift = FALSE; quRPg)  
  m_Path = _T("c:\\"); gDv$DB8-  
  m_Number = _T("0 picture captured."); - `4Ty*K  
  nCount=0; ENyAF%6  
  bRegistered=FALSE; _4!{IdR  
  bTray=FALSE; &SrGh$:X  
 //}}AFX_DATA_INIT UM`nq;>  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .HCaXFW  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); R=Ymo.zs6  
} 5v3RVaqZ  
O8[k_0@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6y9C@5p}B  
{ u?Z <n:  
 CDialog::DoDataExchange(pDX); `I{tZ$iD  
 //{{AFX_DATA_MAP(CCaptureDlg) Q)T+r~#2B  
  DDX_Control(pDX, IDC_KEY, m_Key); /yp/9r@T0  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ssT@<Tk^4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); n. I2$._(b  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?$16 A+  
  DDX_Text(pDX, IDC_PATH, m_Path); `[bJYZBc2  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (Z 8,e  
 //}}AFX_DATA_MAP lvx]jd\  
} c>rKgx  
{=6)SBjf  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5Edo%Hd6  
//{{AFX_MSG_MAP(CCaptureDlg) zU b8NOi  
 ON_WM_SYSCOMMAND() hMWo\qM  
 ON_WM_PAINT() ?DRR+n _  
 ON_WM_QUERYDRAGICON() W6M jQ%f  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) . v\PilF  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) S?2YJ l8B  
 ON_BN_CLICKED(ID_CHANGE, OnChange) I8Kb{[?q  
//}}AFX_MSG_MAP Bi XTC$Oi  
END_MESSAGE_MAP() M=6G:HHY  
sNf +lga0  
BOOL CCaptureDlg::OnInitDialog() N|$5/bV  
{ 9 R  
 CDialog::OnInitDialog(); 8(^ ,r#Gy  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); u6pIdt  
 ASSERT(IDM_ABOUTBOX < 0xF000); c(CJ{>F%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); jNIUsM 8e  
 if (pSysMenu != NULL) j6}$+!E  
 { ~M; gM]r;  
  CString strAboutMenu; s{B_N/^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Wxc^_iqA1  
  if (!strAboutMenu.IsEmpty()) h&P {p _Y  
  {  Zsgi{  
   pSysMenu->AppendMenu(MF_SEPARATOR); Gn[*?=Vy  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1EuK, :x  
  } EzUPah  
 } (s ;zRb!4L  
 SetIcon(m_hIcon, TRUE); // Set big icon 9':/Sab:7v  
 SetIcon(m_hIcon, FALSE); // Set small icon 2n(ItA  
 m_Key.SetCurSel(0); H<XlUCr_~+  
 RegisterHotkey(); E)Srj~$d  
 CMenu* pMenu=GetSystemMenu(FALSE); :cb[M5c  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -aT=f9u  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3r`<(%\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {>A 8g({i  
 return TRUE; // return TRUE unless you set the focus to a control k5C>_( A  
} TGtyJ3x\   
G_0)oC@Jl:  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `;e^2  
{ gLV^Z6eE  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "&}mAWT%If  
 { )6g&v'dq  
  CAboutDlg dlgAbout; "d2LyQy  
  dlgAbout.DoModal(); l)H9J]  
 } g/6nw a  
 else (<n>EF#  
 { =<TO"  
  CDialog::OnSysCommand(nID, lParam); Nv{eE<<6  
 } Xa)7`bp<  
} {)@ j77P  
T*8_FR<  
void CCaptureDlg::OnPaint()  J(^ >?d'  
{ \"t`W:  
 if (IsIconic()) D*qzNT@`LR  
 { v23TL  
  CPaintDC dc(this); // device context for painting 7pd$?=__I  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); sb 8dc  
  // Center icon in client rectangle jKYm/}d  
  int cxIcon = GetSystemMetrics(SM_CXICON); BjN{@ aEO  
  int cyIcon = GetSystemMetrics(SM_CYICON); 6Z$b?A3zM  
  CRect rect; V.U|OQouT  
  GetClientRect(&rect); rrYp'L  
  int x = (rect.Width() - cxIcon + 1) / 2; Ty.drM  
  int y = (rect.Height() - cyIcon + 1) / 2; }\U0[x#q  
  // Draw the icon 5qeT4| Ol  
  dc.DrawIcon(x, y, m_hIcon); ;*_I,|A:Xr  
 } }0vtc[!  
 else wqf&i^_  
 { tG_-;03<`4  
  CDialog::OnPaint(); FRc  |D  
 } y. T ct.  
} > e;]mU`,  
UUD\bWfn  
HCURSOR CCaptureDlg::OnQueryDragIcon() JTjzT2`A.  
{ ]gEu.Nth`  
 return (HCURSOR) m_hIcon; ipfm'aQ  
} T4l-sJ'|  
k-io$  
void CCaptureDlg::OnCancel() $,g 3*A  
{ BSjbnnW}"  
 if(bTray) 8Er[M  
  DeleteIcon(); 7G?Ia%u  
  CDialog::OnCancel(); F>TYVxQ  
} $+iu\MuX  
zz[g{[SN  
void CCaptureDlg::OnAbout() ?!R %o  
{ 38<~R  
 CAboutDlg dlg; >\RDQ%z  
 dlg.DoModal(); ]<Z&=0i#9  
} {jrZ?e-q  
IruyE(;HS  
void CCaptureDlg::OnBrowse() G3oxa/mO  
{ #*[,woNk  
 CString str; 2lX[hFa5  
 BROWSEINFO bi; vI4%d,  
 char name[MAX_PATH]; 'M47'{7T  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); sb8z_3   
 bi.hwndOwner=GetSafeHwnd(); F fZ{%E  
 bi.pszDisplayName=name; XryQ)x(  
 bi.lpszTitle="Select folder"; @"jmI&hYn  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; UUZ6N ZQI  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); e=0l<Rj  
 if(idl==NULL) :v|r=#OI  
  return; ](]*]a4ss  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;L#L Dk{Za  
 str.ReleaseBuffer(); uPM8GIvZX.  
 m_Path=str; W dei`u[  
 if(str.GetAt(str.GetLength()-1)!='\\') iH($rSE  
  m_Path+="\\"; K]*g, s+  
 UpdateData(FALSE); *Pa2bY3:  
} |^ 2rtI  
QJ[(Y@ O6a  
void CCaptureDlg::SaveBmp() C]aOgt/U  
{ h9,wiT  
 CDC dc; l2z`<2mp  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); /e;e\k_}'  
 CBitmap bm; BDarJY  
 int Width=GetSystemMetrics(SM_CXSCREEN); Q>cL?ie  
 int Height=GetSystemMetrics(SM_CYSCREEN); Xi1q]ps  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 50}.Xm@,BO  
 CDC tdc; bjU 2UcI"<  
 tdc.CreateCompatibleDC(&dc); !&1}w86  
 CBitmap*pOld=tdc.SelectObject(&bm); eA3`]XP.`b  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5d)'`hACe  
 tdc.SelectObject(pOld); ;5,`Jpca  
 BITMAP btm; >OF:"_fh  
 bm.GetBitmap(&btm); wghFGHgw  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; NN31?wt  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Dwm@E\^ihm  
 BITMAPINFOHEADER bih; /zChdjz  
 bih.biBitCount=btm.bmBitsPixel; Lf$Q %eM0  
 bih.biClrImportant=0; yffU% )  
 bih.biClrUsed=0; }rFsU\]:q  
 bih.biCompression=0; ~YR <SV\{  
 bih.biHeight=btm.bmHeight; ]1YYrgi7  
 bih.biPlanes=1; 03i?"MvNo  
 bih.biSize=sizeof(BITMAPINFOHEADER); [)C)p*!Y)  
 bih.biSizeImage=size; hX{g]KE>  
 bih.biWidth=btm.bmWidth; V{ 4i$'  
 bih.biXPelsPerMeter=0; +MOe{:/6  
 bih.biYPelsPerMeter=0; [Gh%nsH  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); B^Rw?: hN  
 static int filecount=0; $1Q3Y'Q9  
 CString name; F&nMI:h7  
 name.Format("pict%04d.bmp",filecount++); ~Q.8 U3"  
 name=m_Path+name; /j=DC9_  
 BITMAPFILEHEADER bfh; , }xpYq_/  
 bfh.bfReserved1=bfh.bfReserved2=0; f4 Sw,A  
 bfh.bfType=((WORD)('M'<< 8)|'B'); #`YxoY`  
 bfh.bfSize=54+size; z=- 8iks|  
 bfh.bfOffBits=54; [[.&,6  
 CFile bf; -KJ}.q>upq  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ` $QzTv   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3:02`;3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 6T} CPDRq  
  bf.WriteHuge(lpData,size); 9.MGH2^ L?  
  bf.Close(); Up1$xLSl  
  nCount++; c(_oK ?  
 } os "[Iji  
 GlobalFreePtr(lpData); ?%8})^Dd>4  
 if(nCount==1) Q(!}t"u  
  m_Number.Format("%d picture captured.",nCount); #J<`p  
 else |}]JWsuB  
  m_Number.Format("%d pictures captured.",nCount); g0; &/;"  
  UpdateData(FALSE); `E4!u=%  
} g:uaI  
cLN[o8 ZU  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]HZa:aPY  
{ '<{oYXZW3  
 if(pMsg -> message == WM_KEYDOWN) W?4&lC^G  
 { Jnu}{^~  
  if(pMsg -> wParam == VK_ESCAPE) rSc,\upz  
   return TRUE; a?xq*|?  
  if(pMsg -> wParam == VK_RETURN) bH)8UQR%  
   return TRUE; *x# &[>  
 } N('S2yfDR  
 return CDialog::PreTranslateMessage(pMsg); )N%1%bg^-  
} FS]+s>  
r['=a/.C  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F] dd>#  
{ ?Uy*6YS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ dl3LDB  
  SaveBmp(); /!&b'7y  
  return FALSE; c?V*X-   
} 5qeS|]^`  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;nAg4ll8Q  
 CMenu pop; X-;Qorb^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |=h)efo}  
 CMenu*pMenu=pop.GetSubMenu(0); hsQrd%{f  
 pMenu->SetDefaultItem(ID_EXITICON); ;'WzfJ!q  
 CPoint pt; 4E>/*F!  
 GetCursorPos(&pt); C^8)IN=$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); U d=gdsL  
 if(id==ID_EXITICON) 3 DO$^JJ.  
  DeleteIcon(); C.9eXa1wkT  
 else if(id==ID_EXIT) )T$f k  
  OnCancel(); bTo@gJk n  
 return FALSE; X~Rk ,d3  
} !=q:> }g  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); '#An+;x{  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ;&t1FH#=  
 AddIcon(); _]PfeCn:j  
 return res; L]L~TA<D9i  
} @e?[oojrM  
Oa_o"p<Lr  
void CCaptureDlg::AddIcon() -<}>YtB Q  
{ G+QNg .pH  
 NOTIFYICONDATA data;  <*6y`X  
 data.cbSize=sizeof(NOTIFYICONDATA); MTFVnoZMQ_  
 CString tip; ~XT a=  
 tip.LoadString(IDS_ICONTIP); p *W ZY=Q  
 data.hIcon=GetIcon(0); @qr3v>3X<  
 data.hWnd=GetSafeHwnd(); E't G5,/m  
 strcpy(data.szTip,tip); lo]B 5_en  
 data.uCallbackMessage=IDM_SHELL; ~"<VUJ=Ly:  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; p?`|CE@h7  
 data.uID=98; +<9q]V  
 Shell_NotifyIcon(NIM_ADD,&data); [Yahxw}  
 ShowWindow(SW_HIDE); (82\&dfy  
 bTray=TRUE; KiRt'  
} @)juP- o%  
SUnmp  
void CCaptureDlg::DeleteIcon() r1az=$  
{ Cak/#1  
 NOTIFYICONDATA data; "<n"A7e  
 data.cbSize=sizeof(NOTIFYICONDATA); /x8C70W^  
 data.hWnd=GetSafeHwnd(); :]z-Rz  
 data.uID=98; M]/wei"X  
 Shell_NotifyIcon(NIM_DELETE,&data); .V)2Tz  
 ShowWindow(SW_SHOW); G4J6  
 SetForegroundWindow(); OTtanJ?  
 ShowWindow(SW_SHOWNORMAL); YI\Cs=T/  
 bTray=FALSE; 1n5e^'z  
} p7=^m>Z6  
[, szx1  
void CCaptureDlg::OnChange() t[yD8h  
{ ;x0KaFk  
 RegisterHotkey(); ka9v2tE\  
} U=cWvr65  
)}9}"jrDlx  
BOOL CCaptureDlg::RegisterHotkey() 3=L1HZH  
{ U%PMV?L{  
 UpdateData(); mX_Uhpw?t  
 UCHAR mask=0; ~9/nx|%D  
 UCHAR key=0; t-|=weNy  
 if(m_bControl) g2b4 ia!L  
  mask|=4; f}9`iN=k  
 if(m_bAlt) qD>Y}Z !  
  mask|=2; A`U2HC   
 if(m_bShift) CbvL X="%  
  mask|=1; BaHg c 4zI  
  key=Key_Table[m_Key.GetCurSel()]; rM~IF+f0XD  
 if(bRegistered){ wqoN@d  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); y7G|P~td  
  bRegistered=FALSE; ]O(HZD%  
 } 9(evHR7  
 cMask=mask; VA r?teY  
 cKey=key; uKAHJ$%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); _G8y9!J  
 return bRegistered; WxP4{T* <  
} $6?KH7lA  
hB<z]sl  
  四、小结 C00*X[p  
kC#B7*[RM  
  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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