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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: MZ+"Arzb  
  *qR tk  
  一、实现方法 b>waxQxjS  
2xjS;lpw  
  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,&W5zBKe  
G N{.R7  
#pragma data_seg("shareddata") *.K}`89T  
HHOOK hHook =NULL; //钩子句柄 ~E`l4'g?  
UINT nHookCount =0; //挂接的程序数目 zU}0AVlIL:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 I015)vFc  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9PGSr4V 1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _PRm4 :  
static int KeyCount =0; I 4EocM=  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 z3$PrK%  
#pragma data_seg() EoY570PN  
[PU.lRq  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。  M,6AD]  
QX8N p{g-  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: .rMGI "  
y%T'e(5Ed  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 9> (8r+  
cKey,UCHAR cMask) M2m@N-+R   
{ ",K6zALJ  
 BOOL bAdded=FALSE; w)}[)}T!  
 for(int index=0;index<MAX_KEY;index++){ %iX +"  
  if(hCallWnd[index]==0){ /Db~-$K  
   hCallWnd[index]=hWnd; 3XA^{&}  
   HotKey[index]=cKey; Q"(i  
   HotKeyMask[index]=cMask; yX)2 hj:s  
   bAdded=TRUE; x2nNkd0h  
   KeyCount++; 1ITa6vjS  
   break; AFY;;_Xks  
  } IYrO;GQ  
 } v0HFW%YJ^J  
 return bAdded; N8!B2uPQ  
} >=B8PK+<  
//删除热键 k!! o!rBS  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3_D$6/i  
{ 0/*z]2  
 BOOL bRemoved=FALSE; y6Rg@L&U  
 for(int index=0;index<MAX_KEY;index++){ muY4:F.C(  
  if(hCallWnd[index]==hWnd){ mH8"k+k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =?/J.[)<*  
    hCallWnd[index]=NULL; \?}ZXKuJj  
    HotKey[index]=0; ABx0IdOcI  
    HotKeyMask[index]=0; {Ji[d.cY  
    bRemoved=TRUE; fdPg{3x*k  
    KeyCount--; UyvFR@  
    break; <7)@Jds\  
   } /FQumqbnt  
  } gsZCWT  
 } 2B*9]AHny  
 return bRemoved; J NsK   
} 8S)k]$wf%  
[jY_e`S  
Iw48+krm>  
  DLL中的钩子函数如下: gB&'MA!  
iJ#sg+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2.CI^.5&  
{ Gm_Cq2PD(  
 BOOL bProcessed=FALSE; 4s3n|6v  
 if(HC_ACTION==nCode) *}LYMrP  
 { #LcF;1o%o2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 2!l)% F`  
   switch(wParam) /#.6IV(  
   {  =0O`VSb  
    case VK_MENU: (B[0BjU  
     MaskBits&=~ALTBIT; {@({po  
     break; ]ul]L R%.  
    case VK_CONTROL: eH75: `  
     MaskBits&=~CTRLBIT; VFRUiz/C  
     break; !K3 #4   
    case VK_SHIFT: +A/n <VH  
     MaskBits&=~SHIFTBIT; b}axw+  
     break; (?$}Vp  
    default: //judge the key and send message #IgY'L  
     break; )5p0fw  
   } w+[r$+z!k  
   for(int index=0;index<MAX_KEY;index++){ I>fEwMk~  
    if(hCallWnd[index]==NULL) M$|^?U>cm  
     continue; 02bv0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o-49o5:1  
    { ?7(`2=J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); m~%IHWO'  
     bProcessed=TRUE; {Pdy KgM  
    } )6Hc Pso6  
   } iN=-N=  
  } bluhiiATd  
  else if((lParam&0xc000ffff)==1){ //有键按下 }Vk#w%EJ  
   switch(wParam) cO_En`F  
   { U%"v7G-  
    case VK_MENU: sJMT _yt;  
     MaskBits|=ALTBIT; +Z /Pj_.o  
     break; Pij*?qmeQ  
    case VK_CONTROL: qm] k (/w  
     MaskBits|=CTRLBIT; tP7l ;EX4  
     break; IJ[#$I+Z%  
    case VK_SHIFT: ^!?W!k!:V  
     MaskBits|=SHIFTBIT; F"~uu9u  
     break; ?!cUAa>iH  
    default: //judge the key and send message qVE6ROSh  
     break; P**h\+M>{  
   } I6zKvP8pb  
   for(int index=0;index<MAX_KEY;index++){ F0])g  
    if(hCallWnd[index]==NULL) wwk=*X-8  
     continue; \za 0?b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]qvrpI!E!  
    { QGn3xM66  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 'IKV%$k  
     bProcessed=TRUE; w}X<]u  
    } IL*C/y  
   } "Lw[ $  
  } ~X)Aw 3}F  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 #]cO] I  
   for(int index=0;index<MAX_KEY;index++){ M qFuZg  
    if(hCallWnd[index]==NULL) w+z~Mz}Vz  
     continue; r3{Cuz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E.zY(#S  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Hq ]f$Q6:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 .\".}4qQ  
   } 1T!(M"'Ij  
  } tp7cc;0  
 } vYcea  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); NirG99kyo  
} r[ni{ &  
JPR o<jt=  
  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: !.Eua3:V*  
4'P otv@/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |@!4BA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !EB<e5}8wK  
F4`ud;1H  
  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: 4|ML#aRz  
$oDc  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?:H4Xd7  
{ e5W 8YNA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) W+k SL{0  
 { 6F !B;D-Q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 : M=0o<  
  SaveBmp(); U["'>&B  
  return FALSE; (kCzz-_\  
 } I!Z=3 $,  
 …… //其它处理及默认处理 qT5q3A(8  
} 8eGq.+5G  
avxr|uk  
9kZ[Z ,=>  
  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。 EhB0w;c  
Kg4\:A7Sa.  
  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。 bys5IOP{]o  
`#Z=cq^_  
  二、编程步骤 9EHhVi  
g3B%}!|  
  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"; z0!k  
b\^X1eo  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; = hL;Q@inb  
~XU%_Hz  
  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; 5e1;m6  
f=:ycd!  
  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; ,yf2kU  
!p #m?|Km  
  5、 添加代码,编译运行程序。 N5_`  
wo>7^ZA  
三、程序代码 B6UTooj  
`X)y5*##wq  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @@uKOFA?  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) -j& A;G  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^hZZ5(</8P  
#if _MSC_VER > 1000 w eX%S&#?  
#pragma once _?~EWT   
#endif // _MSC_VER > 1000 ,! b9  
#ifndef __AFXWIN_H__ #w]UP#^io  
#error include 'stdafx.h' before including this file for PCH y Ny,$1  
#endif kZ5;Fe\*  
#include "resource.h" // main symbols S,0h &A9  
class CHookApp : public CWinApp uE E;~`G  
{ c`,'[Q5(O  
 public: 7C / ^ Gw  
  CHookApp(); yrvV<}  
  // Overrides %/;*Ewwb  
  // ClassWizard generated virtual function overrides +6~ut^YiM.  
  //{{AFX_VIRTUAL(CHookApp) <Fo~|Nh|  
 public: 7up~8e$_  
  virtual BOOL InitInstance(); T:/mk`>  
  virtual int ExitInstance(); {gT4Oq__  
  //}}AFX_VIRTUAL BcXPgM!Xqz  
  //{{AFX_MSG(CHookApp) pgUp1goAU  
  // NOTE - the ClassWizard will add and remove member functions here. yjE $o?A  
  // DO NOT EDIT what you see in these blocks of generated code ! emT/5'y  
  //}}AFX_MSG >dK# tsp  
  DECLARE_MESSAGE_MAP() nz2`YyR  
}; ?*AhGza/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); xTnFJ$RK2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K]SsEsd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >p*7)  
BOOL InitHotkey(); 5FMe&  
BOOL UnInit(); V |cPAT%  
#endif :;Xh`br  
zu_bno!  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _9f7@@b  
#include "stdafx.h" yOTC>?p%  
#include "hook.h" TGDrTyI?y  
#include <windowsx.h> Yj"{aFK#u@  
#ifdef _DEBUG 0?,<7}"<X  
#define new DEBUG_NEW S\M+*:7  
#undef THIS_FILE KOhK#t>H@0  
static char THIS_FILE[] = __FILE__; #W9{3JGUY  
#endif L_`D  
#define MAX_KEY 100 .+) AeGh  
#define CTRLBIT 0x04 3D}Pa  
#define ALTBIT 0x02 MX 7 Y1  
#define SHIFTBIT 0x01 w<LV5w+  
#pragma data_seg("shareddata") X<sM4dwxE  
HHOOK hHook =NULL; :8t;_f  
UINT nHookCount =0; LK|1[y^h  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7TtDI=f  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT B4/\=MXb  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey NG5k9pJ  
static int KeyCount =0; W"!{f  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift hsAk7KC  
#pragma data_seg() sa?s[  
HINSTANCE hins; f4;V7DJ  
void VerifyWindow(); Z~AgZM R  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) laRn![[  
//{{AFX_MSG_MAP(CHookApp) #EA` |  
// NOTE - the ClassWizard will add and remove mapping macros here. a9_KoOa.H  
// DO NOT EDIT what you see in these blocks of generated code! 1lYQR`Uh  
//}}AFX_MSG_MAP L[voouaqm  
END_MESSAGE_MAP() \MDhm,H<  
K%.t%)A_3  
CHookApp::CHookApp() MK.TBv  
{ SuA  @S  
 // TODO: add construction code here, cO8yu`4!e  
 // Place all significant initialization in InitInstance B7.<A#y2  
} 7Hg;SK6t0  
: #OaE,  
CHookApp theApp; 9 K>~9Za  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,7Dm p7  
{ Q k2*=BVh  
 BOOL bProcessed=FALSE; nx Jx8d"  
 if(HC_ACTION==nCode) f5z*AeI  
 { 2)Q%lEm`SP  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;TKsAU  
   switch(wParam) 2WS Wfh  
   { Tmk'rOg5  
    case VK_MENU: 9^CuSj  
     MaskBits&=~ALTBIT; 5mX"0a_Q  
     break; T"DG$R,Aj  
    case VK_CONTROL: $\#wsI(  
     MaskBits&=~CTRLBIT; =5O&4G`}  
     break; :z`L)  
    case VK_SHIFT: W0S\g#  
     MaskBits&=~SHIFTBIT; XnKf<|j6k  
     break; [:/mjO K  
    default: //judge the key and send message ky{@*fg.  
     break; =d$m@rc0r  
   } iU|X/>k?  
   for(int index=0;index<MAX_KEY;index++){ x<5;#  
    if(hCallWnd[index]==NULL) 4D[(X=FSU  
     continue; !jR 1!i   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p'kB1)~|  
    { Jq:Wt+a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qFp]jbU  
     bProcessed=TRUE;  GPrq(  
    } E~S~Ld%  
   } 2;7n0LOs}  
  } =)f.Yf|A*  
  else if((lParam&0xc000ffff)==1){ //Key down l'1_Fb  
   switch(wParam) *-3*51 jW  
   { G[+{[W  
    case VK_MENU: WeIi{<u8R  
     MaskBits|=ALTBIT; H on,-<  
     break; UW Px|]RC  
    case VK_CONTROL: Ow {NI-^K  
     MaskBits|=CTRLBIT; S" PJ@E}^E  
     break; q3D,hG_  
    case VK_SHIFT: xf;Tk   
     MaskBits|=SHIFTBIT; C;YtMY:  
     break; qgxGq(6K  
    default: //judge the key and send message :n OCs  
     break; g6h=Q3@  
   } ;y;UgwAM  
   for(int index=0;index<MAX_KEY;index++) M1eM^m8U  
   { :m0 pm@  
    if(hCallWnd[index]==NULL) L;U?s2&Y  
     continue; $*j)ey>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t; @T~%  
    { Dc3bG@K*G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @Ll^ze&HI  
     bProcessed=TRUE; \98|.EG  
    } {A\y 4D@  
   } UAds$ 9  
  } hM[I}$M&O  
  if(!bProcessed){ 1`9'.w+r  
   for(int index=0;index<MAX_KEY;index++){ }0 Fu  
    if(hCallWnd[index]==NULL) d&X <&)a7  
     continue; A<-3u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A/OGF>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #Wt1Ph_;  
   } ~"cqFdnO  
  } ,[u.5vC  
 } lGEfI&1%!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 17lc5#^L  
} Aj+0R?9tG  
: n\D  
BOOL InitHotkey() #VuiY  
{ m,SWG[~  
 if(hHook!=NULL){ (wp?tMN5#  
  nHookCount++; bKQ-PM&I/t  
  return TRUE; mW#p&{  
 } `<?((l%;R  
 else FD.L{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4Z/ ]7Ie  
  if(hHook!=NULL) |Gt]V`4  
   nHookCount++; 30QQnMH3  
  return (hHook!=NULL); xKXD`-|W  
} t.] e8=dE  
BOOL UnInit() dLw,dg  
{ rk `]]  
 if(nHookCount>1){ 51puR8AG>  
  nHookCount--; *KPNWY9!W  
  return TRUE; lsOZ%p%fV  
 } gP=@u.  
 BOOL unhooked = UnhookWindowsHookEx(hHook); G:;(,  
 if(unhooked==TRUE){ FD^s5>"Y+  
  nHookCount=0; mg *kB:p  
  hHook=NULL; #.<(/D+  
 } AeEF/*  
 return unhooked; bAL!l\&2  
} A"T*uv|  
T]?QCf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p"q4R2_/jh  
{ tH9BC5+r}  
 BOOL bAdded=FALSE; `BY&&Bv#?  
 for(int index=0;index<MAX_KEY;index++){ &uxwz@RC0  
  if(hCallWnd[index]==0){ Mh5 =]O+  
   hCallWnd[index]=hWnd; xJ)vfo  
   HotKey[index]=cKey; R1\$}ep^  
   HotKeyMask[index]=cMask; -;t]e6[  
   bAdded=TRUE; {pEbi)CF,}  
   KeyCount++; U=ie| 3  
   break; v,mn=Q&9  
  } vLh,dzuo  
 } D4ud|$s1  
 return bAdded; !\_li+  
} 1 =9 Kwd  
G 4 C 7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !J+< M~o}  
{ 1ogh8%  
 BOOL bRemoved=FALSE; Z#|IMmT;*=  
 for(int index=0;index<MAX_KEY;index++){ M2y"M,k4  
  if(hCallWnd[index]==hWnd){ =#{i;CC%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ n*i1QC  
    hCallWnd[index]=NULL; ' Y.s}Duj  
    HotKey[index]=0; @W*Zrc1NF  
    HotKeyMask[index]=0; c>e~$b8  
    bRemoved=TRUE; qEB]Tj e[  
    KeyCount--; O$ ;:5zT  
    break; +vCW${U  
   } [&p^h  
  } %-~T;_.  
 } ){XG%nC  
 return bRemoved; JheF}/Bx  
} "K-2y ^Dl  
w7X], auRC  
void VerifyWindow() oj~0zJI  
{ Y7 `i~K;  
 for(int i=0;i<MAX_KEY;i++){ 9oJ=:E~CP  
  if(hCallWnd!=NULL){ U/bQ(,3}  
   if(!IsWindow(hCallWnd)){ _sp/RU,J-3  
    hCallWnd=NULL; *27*&&=)H  
    HotKey=0; m' suAj0  
    HotKeyMask=0; 6GtXM3qtS  
    KeyCount--; qlfYX8edZ  
   } olO&7jh7|  
  } 0YVkq?1x9  
 } x'wT%/hp  
} 3ws}E6\D  
J2adA9R/,  
BOOL CHookApp::InitInstance() kQMALS@R  
{ N5:muh \  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); l/w<R  
 hins=AfxGetInstanceHandle(); kKR Z79"7s  
 InitHotkey(); _<1uO=km6  
 return CWinApp::InitInstance(); @AU<'?k  
} #v`J]I)$  
~#jD/  
int CHookApp::ExitInstance() 9K5[a^q|My  
{ @(H  
 VerifyWindow(); =~~Y@eX  
 UnInit(); G\:^9!nwY~  
 return CWinApp::ExitInstance(); 1V37% D  
} V_"K  
?H_'L4Wv  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file A 9HJWKO  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7I_lTu(  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 79 ZBVe(}  
#if _MSC_VER > 1000 -O-qEQd  
#pragma once xl~%hwBd  
#endif // _MSC_VER > 1000 S<V__Sv  
PME ?{%&  
class CCaptureDlg : public CDialog 0cm+:  
{ \#; -C<[b  
 // Construction  uM9[  
 public: '9MtIcNb  
  BOOL bTray; ,pz^8NJAI  
  BOOL bRegistered; <H)I06];  
  BOOL RegisterHotkey(); x\Det$3Kx  
  UCHAR cKey; dT9!gNvQ  
  UCHAR cMask; S@a#,,\[  
  void DeleteIcon(); 9ZEF%&58Y  
  void AddIcon(); //}[(9b'\  
  UINT nCount; /U#{6zeM[,  
  void SaveBmp(); JS<4%@  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor R~],5_|  
  // Dialog Data 3./4] _p  
  //{{AFX_DATA(CCaptureDlg) RrDNEwAr  
  enum { IDD = IDD_CAPTURE_DIALOG }; OyG$ ]C  
  CComboBox m_Key; 007SA6xq  
  BOOL m_bControl; HV??B :  
  BOOL m_bAlt; `%x6;Ha  
  BOOL m_bShift; :+SpZ>  
  CString m_Path; 8U07]=Bt<  
  CString m_Number; %:eep G|  
  //}}AFX_DATA |*im$[g=-  
  // ClassWizard generated virtual function overrides e'c~;Z\A  
  //{{AFX_VIRTUAL(CCaptureDlg) ^rc!X]C9  
 public: !v2D 18(  
  virtual BOOL PreTranslateMessage(MSG* pMsg); q.OkZI0n   
 protected: Et=N`k _gO  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support FSqS]6b3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); . ` OdnLGy  
  //}}AFX_VIRTUAL 0vs9# <&V  
  // Implementation q=5#t~?  
 protected: +FWkhmTv  
  HICON m_hIcon; Gv!* Qk4  
  // Generated message map functions ~$N%UQn?b#  
  //{{AFX_MSG(CCaptureDlg) ~5HI9A4^  
  virtual BOOL OnInitDialog(); }7Si2S  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1X4v:rI  
  afx_msg void OnPaint(); #qk A*WP  
  afx_msg HCURSOR OnQueryDragIcon(); #`C ;@#xr  
  virtual void OnCancel();  @t  
  afx_msg void OnAbout(); DdTTWp/  
  afx_msg void OnBrowse(); qF{u+Ms  
  afx_msg void OnChange(); 8}0W_CU,  
 //}}AFX_MSG ! Q`GA<ikv  
 DECLARE_MESSAGE_MAP() J>P{8Aw  
}; n:GK0wu.s  
#endif I-NzGx2u  
>Rw[x  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f!~gfnn  
#include "stdafx.h" =>Vo|LBoe  
#include "Capture.h" )POuH*j  
#include "CaptureDlg.h" r[zxb0YA  
#include <windowsx.h> &WIiw$@  
#pragma comment(lib,"hook.lib") GQTMQXn(  
#ifdef _DEBUG .,pGW8Js  
#define new DEBUG_NEW > ln%3 =  
#undef THIS_FILE 9d4PH  
static char THIS_FILE[] = __FILE__; dlC)&Ai  
#endif zLlu% Oc  
#define IDM_SHELL WM_USER+1 M?4)U"_VE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Vc3tKuMsiX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  b]s*z<|%  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .N99=%[}h  
class CAboutDlg : public CDialog L{|V13?  
{ [ds:LQq)/  
 public: <h2WM (n  
  CAboutDlg();  = uZ[  
  // Dialog Data nJ#uz:(w,  
  //{{AFX_DATA(CAboutDlg) <LDVO'I0 !  
  enum { IDD = IDD_ABOUTBOX }; gRuNC=sR  
  //}}AFX_DATA A e&t#,)  
  // ClassWizard generated virtual function overrides [0D( PV(n  
  //{{AFX_VIRTUAL(CAboutDlg) 5Cd>p<  
 protected: $ +h~VC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8H3|i7.1h  
  //}}AFX_VIRTUAL AHP_B&s,Qe  
  // Implementation 2l#Ogn`k  
 protected: MJJy mi'b  
  //{{AFX_MSG(CAboutDlg) SUXRWFl  
  //}}AFX_MSG T^8t<S@`  
  DECLARE_MESSAGE_MAP() iK6L\'k  
}; d_*'5Eia6  
F kp;G  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) lvIKL!;H  
{ TdI5{?sW  
 //{{AFX_DATA_INIT(CAboutDlg) mxhO: .l  
 //}}AFX_DATA_INIT sn&y;Vc[$  
} `'[u%UE  
2H_|Attoi  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >[=q9k  
{ ,V!s w5_5m  
 CDialog::DoDataExchange(pDX); cA1"Nek  
 //{{AFX_DATA_MAP(CAboutDlg) yc2c{<Ya5  
 //}}AFX_DATA_MAP 7</&=lly  
} t5#IiPp  
o`HZS|>K*  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) OS6 l*S('  
 //{{AFX_MSG_MAP(CAboutDlg) gk\IivPb  
 // No message handlers 3hr&p{/  
 //}}AFX_MSG_MAP {%xwoMVc+  
END_MESSAGE_MAP() _e$15qW+  
A^_BK(EY  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Mf%0Cx `  
: CDialog(CCaptureDlg::IDD, pParent) U[=VW0  
{ _h!OGLec  
 //{{AFX_DATA_INIT(CCaptureDlg) /c~z(wv  
  m_bControl = FALSE; 7wsn8_n9  
  m_bAlt = FALSE; u~\u8X3  
  m_bShift = FALSE; ^#2w::Ds}!  
  m_Path = _T("c:\\"); ppjd.  
  m_Number = _T("0 picture captured."); jpZ, $  
  nCount=0; ;sCf2TD,_  
  bRegistered=FALSE; \5 IB/ *  
  bTray=FALSE; Yjv}@i"  
 //}}AFX_DATA_INIT ./LD  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V& <vRIsN  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^$SI5WK&)  
} * VH!<k[n  
f n )m$\2  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) .v%H%z~Rl#  
{ Z:W6@j-~  
 CDialog::DoDataExchange(pDX); *{8K b>D  
 //{{AFX_DATA_MAP(CCaptureDlg) Eym<DPu$n  
  DDX_Control(pDX, IDC_KEY, m_Key); hm>JBc:n-  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); `uy)][j-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); t\E#8  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); %geiJ z  
  DDX_Text(pDX, IDC_PATH, m_Path); T>s~bIzL*e  
  DDX_Text(pDX, IDC_NUMBER, m_Number); :l8n)O3  
 //}}AFX_DATA_MAP yTwv2l;U  
} r7/y'Y]O  
@dQIl#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) I.TdYSB  
//{{AFX_MSG_MAP(CCaptureDlg) Y;d$x}dh  
 ON_WM_SYSCOMMAND() e.jrX;;$!&  
 ON_WM_PAINT() X[:Hp`_$  
 ON_WM_QUERYDRAGICON() .w\AyXp  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) +0\BI<aG  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]7n+|@3x  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ?9nuL}m!a  
//}}AFX_MSG_MAP $ 5ZBNGr  
END_MESSAGE_MAP() 6U6,Wu  
YU.aZdA&V3  
BOOL CCaptureDlg::OnInitDialog() s~$ZTzV  
{ f/RzE  
 CDialog::OnInitDialog(); 5mUHk]W  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); f4)fa yAVp  
 ASSERT(IDM_ABOUTBOX < 0xF000); `P<}MeJ\l  
 CMenu* pSysMenu = GetSystemMenu(FALSE); sL|*0,#K  
 if (pSysMenu != NULL) 7N,E%$QL  
 { B)g7MG  
  CString strAboutMenu; =.O8G=;DOA  
  strAboutMenu.LoadString(IDS_ABOUTBOX); yjlX@YXnw  
  if (!strAboutMenu.IsEmpty()) \\XvVi:B  
  { ra=U,  
   pSysMenu->AppendMenu(MF_SEPARATOR); |uI d:^ {  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); wUj[c7Y%  
  } z[X>>P3<n  
 } $L_-U~^  
 SetIcon(m_hIcon, TRUE); // Set big icon 1@sy:{ d`  
 SetIcon(m_hIcon, FALSE); // Set small icon T%Xl(.Ft  
 m_Key.SetCurSel(0); _0ki19rs  
 RegisterHotkey(); Z .VIb|  
 CMenu* pMenu=GetSystemMenu(FALSE); p/L|;c  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?U.+SQ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); G#-t&gO3  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hu0z):>y  
 return TRUE; // return TRUE unless you set the focus to a control E|Mu1I]e  
} os0fwv  
HpY-7QTPJ~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3:Q5dr+1_  
{ :["iBrFp  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lJ;7sgQ#  
 { ste0:.*qb  
  CAboutDlg dlgAbout; Jt5\  
  dlgAbout.DoModal(); <VI.A" Qk~  
 } p A7&  
 else b{JcV  
 {  |`[0U  
  CDialog::OnSysCommand(nID, lParam); ,Bax0p  
 } tIfA]pE  
} 8&<C.n KP  
I WKq_Zjkz  
void CCaptureDlg::OnPaint() F,+nj?i!  
{ vFm8T58 7  
 if (IsIconic()) yXP+$oox9  
 { <]<P<  
  CPaintDC dc(this); // device context for painting ^k6 A,Ak  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); nR'!Ui  
  // Center icon in client rectangle )(yD"]co  
  int cxIcon = GetSystemMetrics(SM_CXICON); ci*rem  
  int cyIcon = GetSystemMetrics(SM_CYICON); y(/"DUx  
  CRect rect; ;Gixu9u'  
  GetClientRect(&rect); ?D ?_D,"C  
  int x = (rect.Width() - cxIcon + 1) / 2; c-1,((p  
  int y = (rect.Height() - cyIcon + 1) / 2; OQ>8Q`  
  // Draw the icon Z$ q{!aY  
  dc.DrawIcon(x, y, m_hIcon); `&y Qtj# '  
 } 3NU{7,F  
 else z6 T3vw  
 { >tc#Ofgzd  
  CDialog::OnPaint(); f_v@.vnn.  
 } T40&a(hXQ  
} EQ< qN<uW  
Z./$}tVUG  
HCURSOR CCaptureDlg::OnQueryDragIcon() %;S T7  
{ FyleK+D?  
 return (HCURSOR) m_hIcon; MiHa'90{K  
} %L(;}sJ.  
SR)jJ=R3  
void CCaptureDlg::OnCancel() mQ(6ahD U  
{ ,F}\njL  
 if(bTray) tDw(k[aK@  
  DeleteIcon(); z OwKh>]  
  CDialog::OnCancel(); UF37|+"E  
} b7-M'-Km0_  
 ;;>hWAS  
void CCaptureDlg::OnAbout() [0vgA#6I  
{ *Rm"3S  
 CAboutDlg dlg; N8*6sK.  
 dlg.DoModal(); ,',  S  
} )B"k;dLm  
 W^dk:  
void CCaptureDlg::OnBrowse() })#VO-J  
{ -DAkVFsN  
 CString str; xib?XzxGo  
 BROWSEINFO bi; !@>_5p>q*  
 char name[MAX_PATH]; Vx'82CIC  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :\hcl&W:  
 bi.hwndOwner=GetSafeHwnd(); j'L/eps?S  
 bi.pszDisplayName=name; 3an9Rb V  
 bi.lpszTitle="Select folder"; YA+jLy6ZL  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 9ZXkuP9vm  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); \vg(@)$q   
 if(idl==NULL)  ;IV  
  return; H(|n,c  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); v9*ugu[K9  
 str.ReleaseBuffer(); o,qq*}=  
 m_Path=str; *Wbs{>&No  
 if(str.GetAt(str.GetLength()-1)!='\\') [d"]AF[#  
  m_Path+="\\"; 2Xw=kwu  
 UpdateData(FALSE); RBOb/.$  
} pg<m0g@W*;  
D;?cf+6$  
void CCaptureDlg::SaveBmp() 0FN;^hP5|  
{ tL#~U2K  
 CDC dc; _\"2Mdk`]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); _PPZ!r(  
 CBitmap bm; da[=d*I.  
 int Width=GetSystemMetrics(SM_CXSCREEN); qStZW^lFeY  
 int Height=GetSystemMetrics(SM_CYSCREEN); :zA/~/Wo  
 bm.CreateCompatibleBitmap(&dc,Width,Height); rgo#mTQ_  
 CDC tdc; yP<ngi^s=  
 tdc.CreateCompatibleDC(&dc);  ujin+;1  
 CBitmap*pOld=tdc.SelectObject(&bm); /$[9-G?  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [|qV*3 |?  
 tdc.SelectObject(pOld); ;- 0 d2Z  
 BITMAP btm; p]jkfsCjN  
 bm.GetBitmap(&btm); SI)QX\is8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 1>yh`Bp\=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); bwR$9 10b  
 BITMAPINFOHEADER bih; jm ORKX+)  
 bih.biBitCount=btm.bmBitsPixel; Aj{c s  
 bih.biClrImportant=0; CJa`[;i0y  
 bih.biClrUsed=0; '@0Z#A  
 bih.biCompression=0; <6.aSOS  
 bih.biHeight=btm.bmHeight; V><,.p8  
 bih.biPlanes=1; @GVONluyU`  
 bih.biSize=sizeof(BITMAPINFOHEADER); Wg5<@=x!G  
 bih.biSizeImage=size; {<}9r6k;f  
 bih.biWidth=btm.bmWidth; #Vy8<Vy&w  
 bih.biXPelsPerMeter=0; !+FrU'^  
 bih.biYPelsPerMeter=0; Q6 oM$qiM  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0-P,zkK_v  
 static int filecount=0;  g)Tr#  
 CString name; <(Rbu2_  
 name.Format("pict%04d.bmp",filecount++); J#'8]p3E  
 name=m_Path+name; }AW"2<@  
 BITMAPFILEHEADER bfh;  Y+d+  
 bfh.bfReserved1=bfh.bfReserved2=0; OA7YWk<K  
 bfh.bfType=((WORD)('M'<< 8)|'B'); *SK`&V  
 bfh.bfSize=54+size; $,.XPK5Q u  
 bfh.bfOffBits=54; ]Y3NmL  
 CFile bf; 11^.oa+`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ H*H~~yQ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); MD):g @  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @?2ES@G+Ji  
  bf.WriteHuge(lpData,size); 9 _oAs"w  
  bf.Close(); A+=K<e  
  nCount++; @fQvAok  
 } P#!^9)3  
 GlobalFreePtr(lpData); A.9ZFFz  
 if(nCount==1) c4f3Dr'xw  
  m_Number.Format("%d picture captured.",nCount); ;x|7"lE  
 else h`n) b  
  m_Number.Format("%d pictures captured.",nCount); JT p+&NS  
  UpdateData(FALSE); ,+4*\yI3l  
} x%'5 rnm|  
a.z)m} +  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |1pD n7  
{ BROn2aSx%  
 if(pMsg -> message == WM_KEYDOWN) rRvZG&k  
 { `Sx1?@8(  
  if(pMsg -> wParam == VK_ESCAPE) =OeLF  
   return TRUE;  ID]E3K  
  if(pMsg -> wParam == VK_RETURN) vbh 5  
   return TRUE; L9$`zc  
 } [xdi.6 %  
 return CDialog::PreTranslateMessage(pMsg); |}o6N5)  
} cx ~XG  
~@\sN+VS  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |SfCuV#g/<  
{ 7_Op(C4,nC  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ .3'U(U  
  SaveBmp(); oLS/  
  return FALSE; [gDl<6a#4  
} t-i\gq^  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ gX|We}H  
 CMenu pop; N mA6L+  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |{ @BH  
 CMenu*pMenu=pop.GetSubMenu(0); P:>]a$Is  
 pMenu->SetDefaultItem(ID_EXITICON); 5S*aZ1t18  
 CPoint pt; 5m yQBKE  
 GetCursorPos(&pt); MW2{w<-]7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `F$lO2#k  
 if(id==ID_EXITICON) BR-4L2[  
  DeleteIcon(); udOdXz6K?  
 else if(id==ID_EXIT) - i#Kpf  
  OnCancel(); ny"z<N&}/  
 return FALSE; S}P rgw/  
} mb>8=hMg  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); f+lPQIB  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) iN9G`qF3!Q  
 AddIcon(); gtnu/ Q  
 return res; (DkfLadB  
} hkB|rhJgm  
`^HK-t4q  
void CCaptureDlg::AddIcon() ]1 jhy2j  
{ \4KV9wm  
 NOTIFYICONDATA data; aH_0EBRc  
 data.cbSize=sizeof(NOTIFYICONDATA); +i~kqiy.  
 CString tip; T0{X,  
 tip.LoadString(IDS_ICONTIP); aH dQi,=z  
 data.hIcon=GetIcon(0); h0?w V5H  
 data.hWnd=GetSafeHwnd(); j}O7fLRu  
 strcpy(data.szTip,tip); Gl%N}8Cim  
 data.uCallbackMessage=IDM_SHELL; twox.@"U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f@ILC=c<  
 data.uID=98; ,u=+%6b)A  
 Shell_NotifyIcon(NIM_ADD,&data); zHKx,]9b  
 ShowWindow(SW_HIDE); UyAy?i8K  
 bTray=TRUE; }tO>&$ Z6f  
} )x<BeD  
`B~zB=}  
void CCaptureDlg::DeleteIcon() Ig<# {V  
{ ?=im  ~  
 NOTIFYICONDATA data; .^6yCs5~`  
 data.cbSize=sizeof(NOTIFYICONDATA); $)eS Gslz  
 data.hWnd=GetSafeHwnd(); @*roW{?!  
 data.uID=98; U4[GA4DZ   
 Shell_NotifyIcon(NIM_DELETE,&data); 2wJa:=$  
 ShowWindow(SW_SHOW); 7GvMKtuSK  
 SetForegroundWindow(); k;Fxr%  
 ShowWindow(SW_SHOWNORMAL); *L~?.9R  
 bTray=FALSE; V`8\)FFG  
} c#f@v45  
x!6<7s  
void CCaptureDlg::OnChange() vY7 @1_"  
{ X}wo$t  
 RegisterHotkey(); 4y.qtiIP>$  
} p=m:^9/  
!4T!@"#  
BOOL CCaptureDlg::RegisterHotkey() m8V}E& 6  
{ Q_Wg4n5  
 UpdateData(); s!S_Bt):3  
 UCHAR mask=0; DYoGtks(  
 UCHAR key=0; dQz#&&s-  
 if(m_bControl) [FZq'E"87  
  mask|=4; LJ K0WWch  
 if(m_bAlt) ,M~> t7+  
  mask|=2; _'4S1  
 if(m_bShift) }kF?9w  
  mask|=1; s\< @v7A  
  key=Key_Table[m_Key.GetCurSel()]; FKPR;H8>  
 if(bRegistered){ *I[tIO\  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :H:Se  
  bRegistered=FALSE; aU@1j;se@  
 } E $P?%<o  
 cMask=mask; ]V)*WP#a  
 cKey=key; #q>\6} )  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); eL<jA9cJ9  
 return bRegistered; ]57yorc`  
} 0gG r/78   
S503b*pM  
  四、小结 w:/3%-  
kZ PL$ \/A  
  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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