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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: !8OgaMngzF  
  G- eSHv  
  一、实现方法 *I9O+/,  
Ri;_ 8v[H|  
  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: M3Oqto<8"  
*=(vIm[KL  
#pragma data_seg("shareddata") ,yH\nqEz  
HHOOK hHook =NULL; //钩子句柄 'T(@5%Db  
UINT nHookCount =0; //挂接的程序数目 !Z<=PdI1Ys  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 i6)HC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 yoG*c%3V?  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  4}F~h  
static int KeyCount =0; yZkS   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 S pk8u4  
#pragma data_seg() xq<X:\O  
cV:Ak~PKl  
  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。 |&U{ z?  
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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: ~}RfepM  
^]MLEr!S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ~DP_1V?  
cKey,UCHAR cMask) ZY=a[K  
{ fs0EbVDF  
 BOOL bAdded=FALSE; vX|5*T`(  
 for(int index=0;index<MAX_KEY;index++){ \gR%PN  
  if(hCallWnd[index]==0){ v"-K-AQjB  
   hCallWnd[index]=hWnd; <h%I-e6  
   HotKey[index]=cKey; 0t7vg#v|  
   HotKeyMask[index]=cMask; p} {H%L  
   bAdded=TRUE; f"SK3hI$p  
   KeyCount++; 9PdD=9HH  
   break; ziC%Q8  
  } .zv BV_I  
 } 8p_6RvG  
 return bAdded; 9J$-E4G.M  
} + f,Kt9Cy  
//删除热键 kxmc2RH>nB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n+S&[Y  
{ `#"xgOSP>  
 BOOL bRemoved=FALSE; ZdgzPs"  
 for(int index=0;index<MAX_KEY;index++){ xSq{pxX  
  if(hCallWnd[index]==hWnd){ Z):Nd9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ '^M.;Giz  
    hCallWnd[index]=NULL; g cb6*@u!  
    HotKey[index]=0; tE,& G-jU  
    HotKeyMask[index]=0; EYA=fU  
    bRemoved=TRUE; '}$$0S.DC  
    KeyCount--; yt<h!k$ _P  
    break; +`tk LvM  
   } Q)im2o@z  
  } p0h E`!  
 } bE?X?[K  
 return bRemoved; &O#,"u/q`  
} |#yH,f  
.F G%QFF~  
<QD[hO^/  
  DLL中的钩子函数如下: JJK-+a6cX  
Z@} qL1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bvS6xU- J  
{ ?AK`M #M  
 BOOL bProcessed=FALSE; J4u>77I  
 if(HC_ACTION==nCode) [0vqm:P  
 { O L 9(~p  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 " =6kH,  
   switch(wParam) nJ h)iQu  
   {  Whe-()pG{  
    case VK_MENU: 9g]%}+D  
     MaskBits&=~ALTBIT; <Xw\:5 F<7  
     break;  QJ!2Vw4K  
    case VK_CONTROL: FLX n%/  
     MaskBits&=~CTRLBIT; &x7iEbRs  
     break; F^81?F i.  
    case VK_SHIFT: OrwVRqW-z  
     MaskBits&=~SHIFTBIT; nc6PSj X  
     break; 8OiCldw:HN  
    default: //judge the key and send message Jv}&8D  
     break; 51Vqbtj^  
   } "6 ~5RCZ  
   for(int index=0;index<MAX_KEY;index++){ -iKoQkHt  
    if(hCallWnd[index]==NULL) _ s*p$/V\  
     continue; .><-XJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S=\cF,Zs  
    { D -d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x#gZC 1$Y  
     bProcessed=TRUE; fUr%@&~l^  
    } <@P. 'rE  
   } LosRjvQ:  
  } n'0r (  
  else if((lParam&0xc000ffff)==1){ //有键按下 '6; {DX  
   switch(wParam)  TD%&9$F  
   { %uCsCl  
    case VK_MENU: |Z)}-'QUJ  
     MaskBits|=ALTBIT; ] E:NmBN<  
     break; @dx 8{oQ  
    case VK_CONTROL: U$Z<lx2P  
     MaskBits|=CTRLBIT; 7Mk>`4D'c  
     break; #ID fJ2  
    case VK_SHIFT: ) J.xQ}g  
     MaskBits|=SHIFTBIT; | 1zfXG,R  
     break; FPH2dN  
    default: //judge the key and send message p]ujip  
     break; {xeJO:M3/  
   } Q-rG~O9-  
   for(int index=0;index<MAX_KEY;index++){ zw+RDo  
    if(hCallWnd[index]==NULL) M\-[C!h,  
     continue; =fJU+N+<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &,yF{9$G  
    { C+g}+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~(8fUob  
     bProcessed=TRUE; tDRo)z  
    } d%.|MAE  
   } E- [Eg  
  } A*~G[KC3(  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 n_Qua|R  
   for(int index=0;index<MAX_KEY;index++){ X</Sl>[8  
    if(hCallWnd[index]==NULL) ul#y'iY]  
     continue; y0`; br\X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;0Q" [[J  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,n[<[tkCR  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 x;<0Gg~jB  
   } NyT%S?@y<  
  } @HPr;m!  
 } heL`"Y2'y>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); IT{c:jo1{`  
} FzcXSKHV %  
0|.jIix;  
  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: I;-Y2*  
oyr b.lu/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QkC*om'/!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v0VQ4>  
@&Z^WN,x  
  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: tH4 q*\U  
_ xTpW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qZ'2M.;  
{ /# ]eVD  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) wN58uV '  
 { ox%j_P9@:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 AH:uG#  
  SaveBmp(); e4 ,SR(O>  
  return FALSE; yQMwt|C4  
 } Zp^O1&\SK?  
 …… //其它处理及默认处理 )obgEJ7Y`l  
} H`'a|Y  
fLqjBG]<  
T.3{}230<  
  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。 tsL ; wT_  
8["%e#%`$  
  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。 ^8_yJ=~V  
n1{[CCee@  
  二、编程步骤 ch :rAx  
&3Yj2 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"; 7P<f(@0h$E  
/'aqQ K<  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 2.I|8d[  
|T@SlNi]  
  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; |=*)a2  
M:GpyE%  
  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; gT0yI ;g]  
NXFi*  
  5、 添加代码,编译运行程序。 D\b$$z]q  
51b%uz  
三、程序代码 Y|><Ls6Q  
:ujpLIjvVG  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL :CW^$Zvq  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ""jW'%wR  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \c CH/  
#if _MSC_VER > 1000 (;;ji!i  
#pragma once ;b*qunJ3L  
#endif // _MSC_VER > 1000 ]t~.?)Ad+2  
#ifndef __AFXWIN_H__ tiE|%jOzt  
#error include 'stdafx.h' before including this file for PCH [U/h'A.j  
#endif iuGwc086  
#include "resource.h" // main symbols x<M::")5!V  
class CHookApp : public CWinApp Fz';H  
{ aqN{@|  
 public: \OtreYi  
  CHookApp(); bf0,3~G,P  
  // Overrides o+&Om~W  
  // ClassWizard generated virtual function overrides T>'O[=UWh  
  //{{AFX_VIRTUAL(CHookApp) ,wes*  
 public: #55:qc>m  
  virtual BOOL InitInstance(); 4qp|g'uXT  
  virtual int ExitInstance(); Rlk3AWl2u  
  //}}AFX_VIRTUAL n 5R9<A^  
  //{{AFX_MSG(CHookApp) oG1zPspL  
  // NOTE - the ClassWizard will add and remove member functions here. WM?-BIlT=  
  // DO NOT EDIT what you see in these blocks of generated code ! ioD8-  
  //}}AFX_MSG 9Z!n!o7D  
  DECLARE_MESSAGE_MAP() ;W|NG3_y  
}; XDJE]2^52?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Lm~<BBp.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0S$k;q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (&Rk#iU 2  
BOOL InitHotkey(); NGSts\D'}  
BOOL UnInit(); d/ ^IL*O  
#endif \/YRhQ  
q+\<%$:u  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2I [zV7 @t  
#include "stdafx.h" ` = O  
#include "hook.h" wQUl!s7M;  
#include <windowsx.h> &&9 |;0 <  
#ifdef _DEBUG NOQ^HEi  
#define new DEBUG_NEW ,M.}Qak^  
#undef THIS_FILE o& FOp'  
static char THIS_FILE[] = __FILE__; rL1yq|]I  
#endif 4F|79U #  
#define MAX_KEY 100 (T#$0RFq  
#define CTRLBIT 0x04 qisvGHo  
#define ALTBIT 0x02 (l^7EpNs  
#define SHIFTBIT 0x01 MGm*({%  
#pragma data_seg("shareddata") )1 T2u  
HHOOK hHook =NULL; ]}! @'+=  
UINT nHookCount =0; iVn4eLK^v  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey JkJ @bh Eu  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `^SRg_rH=`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey |T""v_q  
static int KeyCount =0; 'JMW.;Lh?X  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift *^|\#UIk  
#pragma data_seg() ?d-w#<AiV  
HINSTANCE hins; BA: x*(%~  
void VerifyWindow(); 'c7nh{F  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) x^[,0?y2  
//{{AFX_MSG_MAP(CHookApp) 6]b"n'G  
// NOTE - the ClassWizard will add and remove mapping macros here. aNEah  
// DO NOT EDIT what you see in these blocks of generated code! oL@-<;zKO  
//}}AFX_MSG_MAP 71R,R,  
END_MESSAGE_MAP() I;t@wbY,  
%m |I=P  
CHookApp::CHookApp() "iK= 8  
{ z9ADF(J?0'  
 // TODO: add construction code here, X>[i<ei  
 // Place all significant initialization in InitInstance >NBc-DX^  
} 88osWo6rG  
Dm}eX:'{  
CHookApp theApp; )*]A$\Oc[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .U0Gm_c0  
{ OKMdyyO<l  
 BOOL bProcessed=FALSE; M9W zsWM  
 if(HC_ACTION==nCode) G(a5@9F  
 { 2nkA%^tR  
  if((lParam&0xc0000000)==0xc0000000){// Key up k)n b<JW|r  
   switch(wParam) eT".psRiC  
   { NbU`_^oC  
    case VK_MENU: zkRAul32|  
     MaskBits&=~ALTBIT; 5j`xSG  
     break; 9S|sTf  
    case VK_CONTROL: $K^l=X  
     MaskBits&=~CTRLBIT; 1<BKTMBq?{  
     break; .kBkYK8*t  
    case VK_SHIFT: * hs&^G  
     MaskBits&=~SHIFTBIT; [LnPV2@e  
     break; uslu-|b!%  
    default: //judge the key and send message f#!+l1GV  
     break; U.<j2K um  
   } H[~ D]RG}'  
   for(int index=0;index<MAX_KEY;index++){ d-~V.  
    if(hCallWnd[index]==NULL) S1|u@d'  
     continue; 2o?j{K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U80=f2  
    { ,j*9)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1VgGF^cYR  
     bProcessed=TRUE; W Ej{2+  
    } J 4gtm"2)  
   } xQFY/Z  
  } {^dq7!  
  else if((lParam&0xc000ffff)==1){ //Key down U4!KO;Jc  
   switch(wParam) x fb .Z(  
   { >.Gmu  
    case VK_MENU: uBRlvNJ  
     MaskBits|=ALTBIT; _c>ww<*3  
     break; +LRKS  
    case VK_CONTROL: b e8T<F  
     MaskBits|=CTRLBIT; 0/su`  
     break; dC({B3#e{  
    case VK_SHIFT: qf x*a88  
     MaskBits|=SHIFTBIT; sG u.G  
     break; PGP#$JC  
    default: //judge the key and send message O6G\0o  
     break; KHAc!4lA  
   } K ";Et  
   for(int index=0;index<MAX_KEY;index++) ;g!rc#z2g  
   { Q-oDmjU  
    if(hCallWnd[index]==NULL) aoey 5hts  
     continue; Gm B&TD m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,&UKsrs_  
    { UOZ+ &DL,L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); EQ$k^Y8 "  
     bProcessed=TRUE; R 0RxcB tG  
    } ]<^2B?}  
   } zQyI4RHG[  
  } hBX*02p   
  if(!bProcessed){ PMytk`<`zw  
   for(int index=0;index<MAX_KEY;index++){ ^K<3_D>1>  
    if(hCallWnd[index]==NULL) "/zgh  
     continue; &+#5gii1i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Yg8* )u0  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qLCNANWnd  
   } 9A"s7iJ)  
  } 'SXHq>#gA  
 } "TA0--6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); LaQ7A,]  
} h+W$\T)  
nFQuoU]ux  
BOOL InitHotkey() JVIFpN"`  
{ L?h?LZnq  
 if(hHook!=NULL){ s0iG |vw  
  nHookCount++; fxd+0R;f  
  return TRUE; '[WL8,.Q  
 } 9f! M1  
 else vxmX5.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); -0^]:  
  if(hHook!=NULL) =de'Yy:\-  
   nHookCount++; 8ao-]QoMZ  
  return (hHook!=NULL); XkA] 9,@  
} %R >n5m  
BOOL UnInit() 1Vu#:6%  
{ e`n ZiM>  
 if(nHookCount>1){ 5GM-*Ak@  
  nHookCount--; wyy 1M+  
  return TRUE; !h.hJt  
 } HV~Fe!J_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 9O 'j+?(`@  
 if(unhooked==TRUE){  8oJl ]  
  nHookCount=0; [#Qf#T%5h  
  hHook=NULL; uN)c!='I  
 } o-rX4=T  
 return unhooked; bG]0|  
} Wq4<9D  
?y? 9;;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &3t973=  
{ H7Q$k4\l  
 BOOL bAdded=FALSE; /9pxEidVAS  
 for(int index=0;index<MAX_KEY;index++){ 1b%Oi.;  
  if(hCallWnd[index]==0){ (I~   
   hCallWnd[index]=hWnd; n[Q(q[ULV  
   HotKey[index]=cKey; J1G}l5N  
   HotKeyMask[index]=cMask; 5mZ2CDV  
   bAdded=TRUE; |`o|;A]  
   KeyCount++; GTR*3,rw  
   break; (p5q MP]L  
  } b&P)J|Fe  
 }  JQQ[jl;  
 return bAdded; , '0#q  
} I;w!  
B $g\;$G  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -FJ3;fP&  
{ 8m{e,o2.  
 BOOL bRemoved=FALSE; GURiW42  
 for(int index=0;index<MAX_KEY;index++){ ~]-n%J $q  
  if(hCallWnd[index]==hWnd){ M G$+Blw>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ U 3< 3T  
    hCallWnd[index]=NULL; RB %+|@c  
    HotKey[index]=0; t1w]L  
    HotKeyMask[index]=0; WK6,K92  
    bRemoved=TRUE; -zFJ)!/?  
    KeyCount--; 6Hnez@d  
    break; Dz0D ^(;V  
   } !`e`4y*N  
  } 5!?5S$>  
 } e6taQz@}  
 return bRemoved; "B{3q`(  
} Onq^|r's&  
`PbY(6CF  
void VerifyWindow() DO(};R%=  
{ 8_}t,BC  
 for(int i=0;i<MAX_KEY;i++){ A;L ]=J  
  if(hCallWnd!=NULL){ N~,Ipf  
   if(!IsWindow(hCallWnd)){ O]tR~a  
    hCallWnd=NULL; )jOa!E"  
    HotKey=0; 66& uK|  
    HotKeyMask=0; gL_1~"3KGC  
    KeyCount--; uP* kvi:e  
   } RxqNgun@  
  } )c4tGT<  
 } YD[HBF)~j  
} :xr^E]  
7GO9z<m)  
BOOL CHookApp::InitInstance() _|u}^MLO  
{ AJ}FHym_ZQ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~pZ0B#K J  
 hins=AfxGetInstanceHandle(); Yk|6?e{+)  
 InitHotkey(); +g g_C'"  
 return CWinApp::InitInstance(); !CU-5bpu  
} D U\ytD`u  
c0zcR)=mL  
int CHookApp::ExitInstance() (c[u_~ ;  
{ TX=894{nGh  
 VerifyWindow(); _p6 r5Y  
 UnInit(); 5.\p]>|G1  
 return CWinApp::ExitInstance(); mS'Ad<  
} >8"(go+02  
ms0V1`  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +#eol~j9N  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3JGrJ!x  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ h}a}HabA  
#if _MSC_VER > 1000 m FTuqujO  
#pragma once "<=4]Z  
#endif // _MSC_VER > 1000 59zWB,y(P  
a=}1`Q  
class CCaptureDlg : public CDialog uLzE'Z mV  
{ JP Zp*5c6A  
 // Construction TnN yth wZ  
 public: ]R""L<K%HF  
  BOOL bTray; P*!`AWn  
  BOOL bRegistered; JH\:9B+:L  
  BOOL RegisterHotkey(); Hl}lxK,]  
  UCHAR cKey;  :f[ w  
  UCHAR cMask; eE'P)^KV  
  void DeleteIcon(); _O}m0c   
  void AddIcon(); 2"G9?)d9  
  UINT nCount; { YQS fk  
  void SaveBmp(); c[ZrQJ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor [e` | <  
  // Dialog Data D \i]gfu8W  
  //{{AFX_DATA(CCaptureDlg) <q=Zg7zB  
  enum { IDD = IDD_CAPTURE_DIALOG }; `/[5/%  
  CComboBox m_Key; d0)]^4HT|y  
  BOOL m_bControl; ?+.mP]d_  
  BOOL m_bAlt; #A5X ,-4G  
  BOOL m_bShift; UE^o}Eyg  
  CString m_Path; =Q<VU/  
  CString m_Number; aM $2lR])J  
  //}}AFX_DATA d3q%[[@  
  // ClassWizard generated virtual function overrides xmnBG4,f  
  //{{AFX_VIRTUAL(CCaptureDlg) <<01@Q <  
 public: Zy+ERaF|]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); EK4%4<"  
 protected: {3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o6A$)m5V  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); hM]Z T5;<  
  //}}AFX_VIRTUAL H/{@eaV  
  // Implementation y^ skE{  
 protected: /C8}5)  
  HICON m_hIcon; zd5=W"Y;]  
  // Generated message map functions {A==av  
  //{{AFX_MSG(CCaptureDlg) fJr EDj4(  
  virtual BOOL OnInitDialog(); Cdz?+hb  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0 8)f  
  afx_msg void OnPaint(); \H .Cmm^I  
  afx_msg HCURSOR OnQueryDragIcon(); [@9S-$Xa  
  virtual void OnCancel(); `:=1*7)?  
  afx_msg void OnAbout(); 8p 4[:M@  
  afx_msg void OnBrowse(); 1*p6UR&  
  afx_msg void OnChange(); = z mxki  
 //}}AFX_MSG >fYcr#i0[  
 DECLARE_MESSAGE_MAP() (H uvo9  
}; ]<<,{IQ  
#endif v'?Smd1v /  
KD A8x W  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file M ]047W  
#include "stdafx.h" 79;uHR&S  
#include "Capture.h" fYPu%MN7  
#include "CaptureDlg.h" kS_#8 I  
#include <windowsx.h> 8$~oiK%fw  
#pragma comment(lib,"hook.lib") @ovaOX  
#ifdef _DEBUG  7V5c`:"  
#define new DEBUG_NEW eHvUgDt  
#undef THIS_FILE 9xbT?$^  
static char THIS_FILE[] = __FILE__; xy:Mb =r  
#endif FQ 0&{ulb  
#define IDM_SHELL WM_USER+1 QD0x^v8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 02Vfg42  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a2.6 S./  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; LC]0c)v#  
class CAboutDlg : public CDialog /4(HVua  
{ =!L}/Dl  
 public: }kt%dDU  
  CAboutDlg(); P@@MQ[u?!.  
  // Dialog Data *jhgCm  
  //{{AFX_DATA(CAboutDlg) 'nPI zK<v  
  enum { IDD = IDD_ABOUTBOX }; =-Hhm($n  
  //}}AFX_DATA ~E 6sY  
  // ClassWizard generated virtual function overrides eikZ~!@  
  //{{AFX_VIRTUAL(CAboutDlg) eW 4[2Q  
 protected: Z&>Cdgt*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?u#s?$Y?  
  //}}AFX_VIRTUAL K9ia|2f  
  // Implementation m Z +dr[  
 protected: EHq; eF  
  //{{AFX_MSG(CAboutDlg) HXT"&c|  
  //}}AFX_MSG -6J <{1V  
  DECLARE_MESSAGE_MAP() MUbKlX  
}; zlP{1z;nV  
_LZ(HTX~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) gd * b0(  
{ lZRO"[<  
 //{{AFX_DATA_INIT(CAboutDlg) *@bz<{!  
 //}}AFX_DATA_INIT d8;kM`U  
} i tNuY<"  
Fk49~z   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) cEa8l~GC<  
{ .'o=J`|  
 CDialog::DoDataExchange(pDX); Eb~vNdPo  
 //{{AFX_DATA_MAP(CAboutDlg) Ag2~q  
 //}}AFX_DATA_MAP }&+,y<>   
} _*UI}JtlS  
:q3w;B~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3:Nc`tM_  
 //{{AFX_MSG_MAP(CAboutDlg) 3PvxU|*F  
 // No message handlers U;iCH  
 //}}AFX_MSG_MAP I`oJOLV  
END_MESSAGE_MAP() d1_kw A2y  
(b~l.@xh  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \},H\kK+^  
: CDialog(CCaptureDlg::IDD, pParent) -3yK>\y=|  
{ 0p[k7W u  
 //{{AFX_DATA_INIT(CCaptureDlg) ,sSo\%  
  m_bControl = FALSE; w tGS"L  
  m_bAlt = FALSE; g%= K rO  
  m_bShift = FALSE; fsPsP`|  
  m_Path = _T("c:\\"); ?,7!kTRH  
  m_Number = _T("0 picture captured."); _O}U4aGMTC  
  nCount=0; w_>\Yd[  
  bRegistered=FALSE; r'nPP6`  
  bTray=FALSE; pf'DbY!  
 //}}AFX_DATA_INIT -zYa@PW  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :Ni#XZ{F-/  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); cQ<|Of  
} 9 Vq   
;UXV!8SM  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) h8O\sKn  
{ u(3 uZ:  
 CDialog::DoDataExchange(pDX); XK\nOHLS  
 //{{AFX_DATA_MAP(CCaptureDlg) 4tUoK[p  
  DDX_Control(pDX, IDC_KEY, m_Key); ::{\O\w  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); z59;Qk  
  DDX_Check(pDX, IDC_ALT, m_bAlt); JtY$AP$  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); o|d:rp!^  
  DDX_Text(pDX, IDC_PATH, m_Path); 9mk@\Gqqm  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 93D}0kp  
 //}}AFX_DATA_MAP evZP*N~G  
} p#w8$Qjp  
u9Adu`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) B&B4 P  
//{{AFX_MSG_MAP(CCaptureDlg) %6@)fRw  
 ON_WM_SYSCOMMAND() zjA#8;h~w  
 ON_WM_PAINT() e8f 7*S8  
 ON_WM_QUERYDRAGICON() p=UW ^95  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Wn6m$=  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]r!|@AWrQ\  
 ON_BN_CLICKED(ID_CHANGE, OnChange) bBML +0a  
//}}AFX_MSG_MAP E> pr})^w  
END_MESSAGE_MAP() Z] r9lC  
+JG05h%'  
BOOL CCaptureDlg::OnInitDialog() h #gI1(uL  
{ +C;;4s)  
 CDialog::OnInitDialog(); [4C_iaE  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2k=|p@V n~  
 ASSERT(IDM_ABOUTBOX < 0xF000); Has}oe[  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^L.I9a#]  
 if (pSysMenu != NULL) 2HVqJib4Yn  
 { 03)irq%l;  
  CString strAboutMenu; rD$5]%Y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); kuBtPZ  
  if (!strAboutMenu.IsEmpty()) 2{WZ?H93a  
  { vv)w@A:Vn)  
   pSysMenu->AppendMenu(MF_SEPARATOR); y|B HSc3  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); uPcx6X3]  
  } :9L}jz  
 } #t1? *4.p  
 SetIcon(m_hIcon, TRUE); // Set big icon jTqJ(M}L  
 SetIcon(m_hIcon, FALSE); // Set small icon indbg d  
 m_Key.SetCurSel(0); @I1*b>X~<  
 RegisterHotkey(); b(mZ/2,B  
 CMenu* pMenu=GetSystemMenu(FALSE); e`][zx  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ff0V6j)ji  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ([a;id  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); U~sC%Ri-@U  
 return TRUE; // return TRUE unless you set the focus to a control 2\.23  
} $ #/8l58  
Fv,c8f  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) E$8-8[  
{ 4e\wC  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) fA?Wf[`x  
 { 4MDVR/Z7  
  CAboutDlg dlgAbout; 'HfI~wN  
  dlgAbout.DoModal(); [7x;H  
 } xS/=9l/G  
 else X`&Us  
 { V6ECL6n  
  CDialog::OnSysCommand(nID, lParam); q2|z \  
 } JcP<@bb>B  
} RF6]_-  
OAo03KW  
void CCaptureDlg::OnPaint()  n}b/9  
{ \Qv:7;?  
 if (IsIconic()) Vm@VhCsp  
 { MW^FY4V1m  
  CPaintDC dc(this); // device context for painting QHje}  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $B>L_~cS  
  // Center icon in client rectangle E{-pkqx  
  int cxIcon = GetSystemMetrics(SM_CXICON); Bk.`G)t  
  int cyIcon = GetSystemMetrics(SM_CYICON); l0yflFGr  
  CRect rect; y#Nrq9r:  
  GetClientRect(&rect); S]T71W<i  
  int x = (rect.Width() - cxIcon + 1) / 2; p}GTOJT}  
  int y = (rect.Height() - cyIcon + 1) / 2; d_:tiHw$  
  // Draw the icon 4E!Pxjl3a  
  dc.DrawIcon(x, y, m_hIcon); gBI?dw  
 } N0D5N(kH%  
 else xPT$d,~"  
 { FB+nN5D/  
  CDialog::OnPaint(); nf _(_O=  
 } v(sS$2J|}  
} Cu$`-b^y  
70*yx?TV  
HCURSOR CCaptureDlg::OnQueryDragIcon() &SZAe/3+  
{ "lA$;\&  
 return (HCURSOR) m_hIcon; YP"%z6N@v  
} #/`MYh=!W  
)('{q}JxV  
void CCaptureDlg::OnCancel() Nt<Ac&6 s  
{ @$QtY(a  
 if(bTray) hI<$lEB  
  DeleteIcon(); c&RiUU7  
  CDialog::OnCancel(); R 'mlKe x  
} W^:g_  
6xh -m  
void CCaptureDlg::OnAbout() bDw\;bnG  
{ v"sU87+  
 CAboutDlg dlg; +C`vO5\0  
 dlg.DoModal(); {iLr$ 89  
} RKs_k`N0  
.$G^c   
void CCaptureDlg::OnBrowse() =`(\]t"I  
{ aQ 6T2bQ  
 CString str; L(`q3>iC4.  
 BROWSEINFO bi; ~fgS"F^7n  
 char name[MAX_PATH]; ,tBc%&.f  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ac4dIW{$3  
 bi.hwndOwner=GetSafeHwnd(); 3@;24X  
 bi.pszDisplayName=name; [.G~5%974  
 bi.lpszTitle="Select folder"; Q6X}R,KA1  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -Xgup,}?  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6l>016 x  
 if(idl==NULL) h7]>b'H  
  return; 5FNf)F   
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); p_3VFKq>0  
 str.ReleaseBuffer(); %%O_:@9x,  
 m_Path=str; c$hoqi |tD  
 if(str.GetAt(str.GetLength()-1)!='\\') y3V47J2o  
  m_Path+="\\"; t&bE/i_T  
 UpdateData(FALSE); .|kp`-F51  
} BxxqzN+  
8=sMmpB 7u  
void CCaptureDlg::SaveBmp() g'eJN  
{ 4~:D7",Jn  
 CDC dc; s.}:!fBk  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); TU8K\;l]  
 CBitmap bm; `p^xdj}  
 int Width=GetSystemMetrics(SM_CXSCREEN); `jFvG\aC  
 int Height=GetSystemMetrics(SM_CYSCREEN); a<D]Gz^h  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ;}4e+`fF|  
 CDC tdc; 1\,wV,  
 tdc.CreateCompatibleDC(&dc); g5&,l  
 CBitmap*pOld=tdc.SelectObject(&bm); dI8y}EbE~  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); f9E.X\"  
 tdc.SelectObject(pOld); U &W}c^#  
 BITMAP btm; Cd'SPaR  
 bm.GetBitmap(&btm); >\!>CuU  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; }xzbg  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~hA;ji|I  
 BITMAPINFOHEADER bih; f['pHR%l2$  
 bih.biBitCount=btm.bmBitsPixel; +@oo8io  
 bih.biClrImportant=0; x(88Y7o.t  
 bih.biClrUsed=0; 2! bE|  
 bih.biCompression=0; &_c5C  
 bih.biHeight=btm.bmHeight; {7q +3f <  
 bih.biPlanes=1; )N&v. w  
 bih.biSize=sizeof(BITMAPINFOHEADER); 3PZwz^oRh9  
 bih.biSizeImage=size; /`VtW$9-  
 bih.biWidth=btm.bmWidth; .mS'c#~5Y  
 bih.biXPelsPerMeter=0; N` rOlEk  
 bih.biYPelsPerMeter=0; 8|#p D4e  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !;C *Wsp}  
 static int filecount=0; 2KmPZ&r  
 CString name; R_DZJV O  
 name.Format("pict%04d.bmp",filecount++); d5B96;3  
 name=m_Path+name; ODqWXw#  
 BITMAPFILEHEADER bfh; 6JL:p{RLi  
 bfh.bfReserved1=bfh.bfReserved2=0; v:] AS:  
 bfh.bfType=((WORD)('M'<< 8)|'B'); K_~SJbl  
 bfh.bfSize=54+size; "Q@ZS2;A  
 bfh.bfOffBits=54; wms8z  
 CFile bf; 'xp&)g L  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Q|}Pc>ae  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); >;@hA*<  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); (PCv4:`g  
  bf.WriteHuge(lpData,size); 5zBsulRt  
  bf.Close(); ~cx/>Hu  
  nCount++;  ,  
 } XmoS$ /#"  
 GlobalFreePtr(lpData); #G ZGk?  
 if(nCount==1) ]LhNP}c  
  m_Number.Format("%d picture captured.",nCount); A,qWg0A]nt  
 else FVcoo V  
  m_Number.Format("%d pictures captured.",nCount); 3$`qy|=zO  
  UpdateData(FALSE); Ea*Jl<  
} V qW(S1w  
GzUgzj|BN~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3l@={Ts  
{ 0zAj.iG  
 if(pMsg -> message == WM_KEYDOWN) L);kwx7{LW  
 { /TgG^|  
  if(pMsg -> wParam == VK_ESCAPE) >m{)shBX  
   return TRUE;  HRKe 7#e  
  if(pMsg -> wParam == VK_RETURN) 3E361?ubM  
   return TRUE; Z*|qbu)  
 } v2Bks 2  
 return CDialog::PreTranslateMessage(pMsg); r'q9N  
} ,2%>e"%  
)rs);Pl  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) DjjG?(1  
{ s],+]<qX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ k w!1]N  
  SaveBmp(); 0:(@Y  
  return FALSE; ukSi9| 1-,  
} 8W"~>7/>D  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ eS jXaZh  
 CMenu pop; *lIK?"mo  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `_'I 9,.a  
 CMenu*pMenu=pop.GetSubMenu(0); vF K&.J  
 pMenu->SetDefaultItem(ID_EXITICON); %G$KahxV>  
 CPoint pt; jibrSz  
 GetCursorPos(&pt); ^8nK x<&5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ,wlh0;,  
 if(id==ID_EXITICON) r=+r5k"`  
  DeleteIcon(); H{P"$zj`l  
 else if(id==ID_EXIT) M+ gYKPP  
  OnCancel(); 'qhA4W9  
 return FALSE; }cE,&n  
} /tf}8d  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); *r+i=i8{  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) zKWcDbj  
 AddIcon(); |T9p#) ec2  
 return res; (6G5UwSt  
} RCq_FY  
KutR l$,  
void CCaptureDlg::AddIcon() ;Q2p~-0Q  
{  wYS,|=y  
 NOTIFYICONDATA data; SA|f1R2uS  
 data.cbSize=sizeof(NOTIFYICONDATA); -<i&`*zG  
 CString tip; fV_(P_C  
 tip.LoadString(IDS_ICONTIP); , c/\'k\K)  
 data.hIcon=GetIcon(0); _Ucj)Ud k  
 data.hWnd=GetSafeHwnd(); !_cT_ WHty  
 strcpy(data.szTip,tip); mIZ#uW  
 data.uCallbackMessage=IDM_SHELL; S3Tww]q  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; AtA}OY]D /  
 data.uID=98; lV^sVN Z]  
 Shell_NotifyIcon(NIM_ADD,&data); xgtdmv%  
 ShowWindow(SW_HIDE); 8_ns^6XK5p  
 bTray=TRUE; @M"h_Z1#  
} 'wX'}3_/g  
h2u> CXD  
void CCaptureDlg::DeleteIcon() rj*4ZA?  
{ !\8j[QS!  
 NOTIFYICONDATA data; 8+uwzBNZ:  
 data.cbSize=sizeof(NOTIFYICONDATA); l\*}  
 data.hWnd=GetSafeHwnd(); 1HBch]J  
 data.uID=98; '@Y@H,  
 Shell_NotifyIcon(NIM_DELETE,&data); 5_nkN`x  
 ShowWindow(SW_SHOW); b'^ -$  
 SetForegroundWindow(); UPPDs"  
 ShowWindow(SW_SHOWNORMAL); y2^r.6"O  
 bTray=FALSE; Sj}@5 X6 C  
} l0b Y  
R{+ Rvk  
void CCaptureDlg::OnChange() 3Cwqy#X#8  
{ VWmZ|9Ri  
 RegisterHotkey(); o;\0xuM@  
} 2HMlh.R(C  
rBkf@  
BOOL CCaptureDlg::RegisterHotkey() yU*j{>%RsK  
{ HlY4%M5q/  
 UpdateData(); pP)0 l  
 UCHAR mask=0; /H,!7!6>?  
 UCHAR key=0; j+J)S1  
 if(m_bControl) Sz"J-3b^  
  mask|=4; JB'q_dS}  
 if(m_bAlt) r%$-F2.p  
  mask|=2; >)U 7$<&b  
 if(m_bShift) v/Z}|dT"  
  mask|=1; NwuME/C7#  
  key=Key_Table[m_Key.GetCurSel()]; $d!Sl a  
 if(bRegistered){ HH2*12e  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); >wM%|j'  
  bRegistered=FALSE; SA{A E9y  
 } ZsUxO%jP  
 cMask=mask; :j vx-jQ  
 cKey=key; ?ae:9ZcH  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); GOa](oD}  
 return bRegistered; ~c :e0}  
} F)Yn1&a#H  
W==HV0n  
  四、小结 bUp%87<*X  
L;5j hVy  
  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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