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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: =;/4j'1}9  
  PL#8~e;'  
  一、实现方法 y4HOKJxI  
D %`64R  
  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: D/w4u;E@  
? 5qo>W<7  
#pragma data_seg("shareddata") RrkS!E[C  
HHOOK hHook =NULL; //钩子句柄  l+.E'   
UINT nHookCount =0; //挂接的程序数目 D@i,dPz5Zl  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 [UVxtMJ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 QM1-w^  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |yi3y `f  
static int KeyCount =0; Ok+zUA[Wu  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 '|b {  
#pragma data_seg() FBM 73D@`  
T{={uzQeJJ  
  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":D{+wC |  
^IxT.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: B8^tIq  
3:i4DBp,i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR UlHRA[SCv  
cKey,UCHAR cMask) zv]-(<B  
{ iAX\F`  
 BOOL bAdded=FALSE; j w)Lofn  
 for(int index=0;index<MAX_KEY;index++){ ~a[]4\ m;  
  if(hCallWnd[index]==0){ E/ <[G?  
   hCallWnd[index]=hWnd; 8=!M0i  
   HotKey[index]=cKey; ?=]`X=g 6  
   HotKeyMask[index]=cMask; Tw{H+B"uVz  
   bAdded=TRUE; ,#1ke  
   KeyCount++; WYQJ +z5  
   break; FX"%  
  } bh&,*Y6=  
 } @^y/V@lDm  
 return bAdded; *hAeA+:  
} z[DUktZl  
//删除热键 U RDb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,@=qaU  
{ O~g _rcG  
 BOOL bRemoved=FALSE; Wiqy".YY  
 for(int index=0;index<MAX_KEY;index++){ dhN[\Z%  
  if(hCallWnd[index]==hWnd){ Ru Q\H0pr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p;:tzH\l  
    hCallWnd[index]=NULL; <0T4MR7  
    HotKey[index]=0; (}fbs/8\p  
    HotKeyMask[index]=0; aC>r5b#:  
    bRemoved=TRUE; TRrO-  
    KeyCount--; .9Bimhc6K  
    break; e0HG"z4  
   } PKR0y%Ar  
  } "_ b Sy  
 } v#.FK:u}  
 return bRemoved; *$x/(!UE  
} >\K<q>*  
/d5_-AB(v  
a\\B88iRRZ  
  DLL中的钩子函数如下: 4@|K^nT`  
^ 3LM%B  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $=$I^hV  
{ Z9ciS";L  
 BOOL bProcessed=FALSE; v@;:aN  
 if(HC_ACTION==nCode) j-ugsV`2=*  
 { C8cB Lsa[J  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 7Nc@7_=  
   switch(wParam) x{u_kepv[k  
   {  ?L#C'Lz2+  
    case VK_MENU: t'4hWNR'  
     MaskBits&=~ALTBIT; ?6B)Ek,'X?  
     break; %}P^B^O  
    case VK_CONTROL: MQ2gzKw>  
     MaskBits&=~CTRLBIT; N10'./c K  
     break; y-}lz#N  
    case VK_SHIFT: 2GcQh]ohc  
     MaskBits&=~SHIFTBIT; ]Ole#Lz}Q  
     break; /`0*!sN*5  
    default: //judge the key and send message AqvRzi(Y  
     break; bK; -Xcm  
   } 673v  
   for(int index=0;index<MAX_KEY;index++){ _%!C;`3Y  
    if(hCallWnd[index]==NULL) F8Y D:   
     continue; uJMF\G=nb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $Ha?:jSc  
    { e%N\Pshgv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z?[;Japg  
     bProcessed=TRUE; H|T:_*5  
    } &qFdP'E;$  
   } kjN9(&D  
  } nG$*[7<0u  
  else if((lParam&0xc000ffff)==1){ //有键按下 *(L4rK\2  
   switch(wParam) 9x&,`95O  
   { z7MJxjH  
    case VK_MENU: <(?ahO5  
     MaskBits|=ALTBIT; jt tlzCDn  
     break; <8!mmOK1  
    case VK_CONTROL: e>1^i;f  
     MaskBits|=CTRLBIT; q#I/N$F  
     break; C;wN>HE  
    case VK_SHIFT:  b#P ,  
     MaskBits|=SHIFTBIT; `?rPs8+R  
     break; @fT*fv   
    default: //judge the key and send message p{!aRB%  
     break; Vlce^\s;  
   } (iGk]Rtzt  
   for(int index=0;index<MAX_KEY;index++){ v*QobI  
    if(hCallWnd[index]==NULL) z]Z>+|  
     continue; 5wRDH1z@{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >9F,=63A  
    { DyG3|5s1R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8;p6~&).C~  
     bProcessed=TRUE; uwQ{y>SG  
    } !li Q;R&  
   } O~9 %!LAu  
  } 6YrkS;_HS  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .Q?cNSWU  
   for(int index=0;index<MAX_KEY;index++){ 5)V J  
    if(hCallWnd[index]==NULL) <X j:c2@  
     continue; WDY,?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) x+nrdW+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Hm`9M.5b  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 oj$D3  
   } /`D]m?  
  } u q:>g  
 } ~({aj|Y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]0xbvJ8oK  
} [xk1}D  
@8|-  C  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 9Z6] ];8E  
U{h5uezD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c%Yvj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g$?B!!qT  
s41<e"  
  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: wX#=l?,K  
8~EDmg[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /%$'N$@f  
{ Cq u/(=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) vC$[Zm  
 { x<P$$G/  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 s8{3~Hv  
  SaveBmp(); +G? 4Wc1  
  return FALSE; h;^h[q1'  
 } 7w|W\J^7r  
 …… //其它处理及默认处理 Bb]pUb  
} ):+n!P  
d vkA-9  
@?3u|m |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。 (# eB %  
so8isDC'9  
  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。 \UGs_5OT  
aIRCz=N  
  二、编程步骤 * ?rw'  
Xl2Fgg}#  
  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"; y{s?]hLk  
1*[h$Z&H?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; t\CVL?e`  
5(%+8<2  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; NV9D;g$Y  
m!|u{<,R  
  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; 6t *pV [  
-/B}XN W  
  5、 添加代码,编译运行程序。 CP|N2rb  
"\vEi &C  
三、程序代码 $[VKM|Zjw  
I(s\ Q[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Od^y&$|_%`  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) SBAq,F'  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ E6NkuBQ((  
#if _MSC_VER > 1000 >VE,/?71@  
#pragma once L<J';#BD  
#endif // _MSC_VER > 1000 ^uMy|d  
#ifndef __AFXWIN_H__ 9 vmH$  
#error include 'stdafx.h' before including this file for PCH xFHc+m' m~  
#endif ;f^.7|  
#include "resource.h" // main symbols I/Hwf  
class CHookApp : public CWinApp O!hg@[\B+  
{ p` B48TW  
 public: 'vhgR2/  
  CHookApp(); Ua,Lg.z  
  // Overrides k5$_Q#  
  // ClassWizard generated virtual function overrides J1 a/U@"  
  //{{AFX_VIRTUAL(CHookApp) lHV bn7  
 public: vy,ER<  
  virtual BOOL InitInstance(); FaPX[{_E  
  virtual int ExitInstance(); Jq l#z/z  
  //}}AFX_VIRTUAL =~?2i)-mC  
  //{{AFX_MSG(CHookApp) ?M;2H {KG:  
  // NOTE - the ClassWizard will add and remove member functions here. ^p|MkB?uM  
  // DO NOT EDIT what you see in these blocks of generated code ! FdKp@&O+1  
  //}}AFX_MSG @%O"P9;s  
  DECLARE_MESSAGE_MAP() `]FA} wC  
}; Vu*yEF}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); &AU%3b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ` *&*jdq&i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PnFU{N  
BOOL InitHotkey(); xA`Q4"[I  
BOOL UnInit(); (NFq/w%  
#endif pez[qs  
6U @3 xU`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. zKx?cEpE  
#include "stdafx.h" kmi[u8iXD_  
#include "hook.h" ?#<Fxme  
#include <windowsx.h> y"]?TEd  
#ifdef _DEBUG I+!w9o2nZ  
#define new DEBUG_NEW '8 1M%KO  
#undef THIS_FILE ']ya_v~e  
static char THIS_FILE[] = __FILE__; Zi|MWaA.f  
#endif =xSFKu*  
#define MAX_KEY 100 ^Gq4Yr  
#define CTRLBIT 0x04 R^1sbmwk  
#define ALTBIT 0x02 y{uRh>l  
#define SHIFTBIT 0x01 Z WL/AC  
#pragma data_seg("shareddata") -=&r}/&  
HHOOK hHook =NULL; 2wlrei  
UINT nHookCount =0; !Z YMks4  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey - A x$Y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT SJ6lI66OX  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey WLP A51R  
static int KeyCount =0; Q i&!IG  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift HN7(-ml=B  
#pragma data_seg() 6m_Y%&   
HINSTANCE hins; pT>[w1Kk^  
void VerifyWindow(); J|W~\(W6i  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?#-"YO7  
//{{AFX_MSG_MAP(CHookApp) 3=o3VGZP  
// NOTE - the ClassWizard will add and remove mapping macros here. Y 1rU  
// DO NOT EDIT what you see in these blocks of generated code! B0?E$8a  
//}}AFX_MSG_MAP |+~CdA  
END_MESSAGE_MAP() Pg{Dy>&2`I  
MSUkCWt!  
CHookApp::CHookApp() (Q o  
{ [D[s^<RJs  
 // TODO: add construction code here, h1z[ElEeoP  
 // Place all significant initialization in InitInstance nC$f0r"z  
} xlp^XT6#  
]!d #2(  
CHookApp theApp; MOP/q4j[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 'VS!<  
{ W#P)v{K  
 BOOL bProcessed=FALSE; IiHl"2+/  
 if(HC_ACTION==nCode) beRpA;  
 { B[Fx2r`0  
  if((lParam&0xc0000000)==0xc0000000){// Key up R^iF^IB  
   switch(wParam) M9.jJf  
   { ^o,P>u!9  
    case VK_MENU: V k5}d[[l  
     MaskBits&=~ALTBIT; "diF$Lj  
     break; `J|bGf#  
    case VK_CONTROL: |#D3~au   
     MaskBits&=~CTRLBIT; WogJ~N,d53  
     break; VE+Q Y9(  
    case VK_SHIFT: X~*1  
     MaskBits&=~SHIFTBIT; u> XCE|D*  
     break;  \U(qv(T  
    default: //judge the key and send message F-R4S^eV  
     break; ZN~:^,PO/  
   } D.kLx@Z  
   for(int index=0;index<MAX_KEY;index++){ 3 q^3znt  
    if(hCallWnd[index]==NULL) c/DB"_}!a  
     continue; T6=,A }t-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6{B$_Usg  
    { OIGu`%~js  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \hai  
     bProcessed=TRUE; 8~YhT]R=  
    } ^q-]."W]t~  
   } q(p]6Ha|  
  } =Bcwd7+  
  else if((lParam&0xc000ffff)==1){ //Key down {u{n b3/jl  
   switch(wParam) Y #E/"x%+  
   { 5%,J@&5G s  
    case VK_MENU: >'iXwe-  
     MaskBits|=ALTBIT; 1//d68*"  
     break; F.i*'x0u  
    case VK_CONTROL: ~2@+#1[g8z  
     MaskBits|=CTRLBIT; LX[<Wh_X(  
     break; @;_xFL;{g  
    case VK_SHIFT: .K]n<+zW  
     MaskBits|=SHIFTBIT; "_WOt Jr  
     break; : KhAf2A  
    default: //judge the key and send message 9_)*b  
     break; ~~!iDF\  
   } lQj3# !1}  
   for(int index=0;index<MAX_KEY;index++) R*VRxQ,h6+  
   { J,Du:|3o  
    if(hCallWnd[index]==NULL) 62TWqQ!9d  
     continue; kG@~;*;l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9dn~nnd'n  
    { /FJ )gQYA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Aj((tMJNOw  
     bProcessed=TRUE; b-ZC~#?|b  
    } ^&F8NEb=2>  
   } h)fJ2]JW8W  
  } 0}}b\!]9  
  if(!bProcessed){ mlW0ptp  
   for(int index=0;index<MAX_KEY;index++){ 0Mpc#:a%1  
    if(hCallWnd[index]==NULL) ))- B`vi  
     continue; :l ~Wt7R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) eLWD?-v%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _; /onM   
   } LI1OocY.]  
  } }c|)i,bL  
 } 2XI%z4\)!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *WdnP.'Y  
} qIIc>By(\"  
FC[8kq>Hk  
BOOL InitHotkey() `1k0wT(  
{ , 7-@eZ  
 if(hHook!=NULL){ MWTzJGRT  
  nHookCount++; = i9|lU"Va  
  return TRUE; BQ! v\1'C  
 } P7np -I*  
 else x8 :  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); @c,Qj$\1  
  if(hHook!=NULL) fGS5{dti  
   nHookCount++; &v9*D`7L  
  return (hHook!=NULL); 5q4sxY9T  
} t M?3oO  
BOOL UnInit() :j feY  
{ _]zm02|  
 if(nHookCount>1){ ;%wQnhg  
  nHookCount--; *%'nlAX6%  
  return TRUE; _=l8e-6r  
 } 3"afrA  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 12r]"?@|s  
 if(unhooked==TRUE){ |:)UNb?R"O  
  nHookCount=0; C]H'z  
  hHook=NULL; sg0HYb%_E  
 } 1@" L  
 return unhooked; 7HfA{.|m  
} L *",4!  
bit@Kv1<C  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) o&WKk5$  
{ s.ywp{EF  
 BOOL bAdded=FALSE; [HO=ii]Wb  
 for(int index=0;index<MAX_KEY;index++){ .YOC|\  
  if(hCallWnd[index]==0){ fP 4  
   hCallWnd[index]=hWnd; <E/"v  
   HotKey[index]=cKey; wP:ab  
   HotKeyMask[index]=cMask; ,F^Rz.  
   bAdded=TRUE; 'KL!)}B$h  
   KeyCount++; <;)qyP  
   break; )/uu~9SFd  
  } v:.`~h/b  
 } MYI*0o;  
 return bAdded; j !m42  
} >Vp #   
~t0\Q; @($  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) RC{|:@]8  
{ Qmbl_#  
 BOOL bRemoved=FALSE; |Iq#Q3w  
 for(int index=0;index<MAX_KEY;index++){ &.D#OnRh9  
  if(hCallWnd[index]==hWnd){ %#gHa  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ XNZW J  
    hCallWnd[index]=NULL; s,~)5nL  
    HotKey[index]=0; >2kjd  
    HotKeyMask[index]=0; Owt|vceT  
    bRemoved=TRUE; zNg8Oq&  
    KeyCount--; v>ygr8+C,  
    break; [&_c.ti  
   } (c3%rM m]  
  } >U4hsr05  
 } w&U>w@H^  
 return bRemoved; 4<c #3]  
} #@qd.,]2  
~m0l_:SF  
void VerifyWindow() pXL@&]U+  
{ b Ag>;e(  
 for(int i=0;i<MAX_KEY;i++){ j=>:{`*c  
  if(hCallWnd!=NULL){ 22`N(_  
   if(!IsWindow(hCallWnd)){ .|d2s  
    hCallWnd=NULL; 7|vB\[s  
    HotKey=0; ;`CNe$y   
    HotKeyMask=0; T1Gy_ G/  
    KeyCount--; ;_]Z3  
   } e3YdHp  
  } 4|yZA*Q^  
 } @20~R/vh  
} &i/QFO7y}  
cwK+{*ZH/  
BOOL CHookApp::InitInstance() ;`p!/9il  
{ %+A z X  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); %BV 2 q  
 hins=AfxGetInstanceHandle(); <Oyxzs  
 InitHotkey(); :f9O3QA  
 return CWinApp::InitInstance(); c+_F}2)  
} '5:P,1tW U  
B%~D`[~?  
int CHookApp::ExitInstance() vbn'CY]QU  
{ Gd= l{~  
 VerifyWindow(); (txr%Z0E  
 UnInit(); 9gS.G2  
 return CWinApp::ExitInstance(); B^{87YR  
} +0)zB;~7  
F~qiNV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file (";{@a %  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) d7O\p(M1  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !Eof7LUE  
#if _MSC_VER > 1000 <kY ||  
#pragma once ]t'bd <O  
#endif // _MSC_VER > 1000 Y$L>tFA  
@1p ,  
class CCaptureDlg : public CDialog ,vN0Jpf}\8  
{ \q |n0>  
 // Construction Wd0$t    
 public: #!h +K"wX  
  BOOL bTray; Y64B"J=P 9  
  BOOL bRegistered; x?|C-v  
  BOOL RegisterHotkey(); c[a1 Md&  
  UCHAR cKey; qUW>qi,  
  UCHAR cMask; uI'g]18Hi  
  void DeleteIcon(); Dq~PxcnI  
  void AddIcon(); dE[_]2];P  
  UINT nCount; m{ya%F  
  void SaveBmp(); ^Z 9v_qB  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor A \6Q*VhK  
  // Dialog Data $1(FN+ M b  
  //{{AFX_DATA(CCaptureDlg) wd=xs7Dz<p  
  enum { IDD = IDD_CAPTURE_DIALOG }; Q<e`0cu|p  
  CComboBox m_Key; /nX+*L}d/  
  BOOL m_bControl; |>Xw"]b;  
  BOOL m_bAlt; TYs#v/)I  
  BOOL m_bShift; .x^`y2'U  
  CString m_Path; %5zztReI  
  CString m_Number; 9gz"r  
  //}}AFX_DATA qtv>`:neB  
  // ClassWizard generated virtual function overrides FyZiiH4|  
  //{{AFX_VIRTUAL(CCaptureDlg) zF F=v7[j  
 public: l imzDQ^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1f.xZgO/2  
 protected: o4Bl!7U  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Vu6p l  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,Cj8{s&;  
  //}}AFX_VIRTUAL fC$~3v  
  // Implementation }PR^Dj.  
 protected: K%p*:P  
  HICON m_hIcon; M~G1ZB  
  // Generated message map functions SwDUg}M~  
  //{{AFX_MSG(CCaptureDlg) {mlJE>~%  
  virtual BOOL OnInitDialog(); i>M*ubWE4@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); :EUV#5V.  
  afx_msg void OnPaint(); .%@=,+nqz  
  afx_msg HCURSOR OnQueryDragIcon(); oc2aE:>X  
  virtual void OnCancel(); x%;Q /7&$  
  afx_msg void OnAbout(); UJ0Dy ` f  
  afx_msg void OnBrowse(); Qbc62qFu!  
  afx_msg void OnChange(); L-ZJ[#D  
 //}}AFX_MSG EmDA\9~@R  
 DECLARE_MESSAGE_MAP() mQ9%[U,  
}; \E'Nk$V3  
#endif D4"](RXH  
h=3156M  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `R}D@  
#include "stdafx.h" 3xW;qNj:!l  
#include "Capture.h" ;'Pi(TA)  
#include "CaptureDlg.h" =](c7HEQf  
#include <windowsx.h> kUJ\AK  
#pragma comment(lib,"hook.lib") GQ-o wH]  
#ifdef _DEBUG #0-!P+c[  
#define new DEBUG_NEW JuGQS24  
#undef THIS_FILE *5i~N}  
static char THIS_FILE[] = __FILE__; $E^#DjhRQ3  
#endif 4LU'E%vlC  
#define IDM_SHELL WM_USER+1 ZOFBT(oV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Lp \%-s#5s  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RRD\V3C84  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^"w.v' sL  
class CAboutDlg : public CDialog ;z9(  
{ NVnKgGlHgd  
 public: /HNZwbh]uJ  
  CAboutDlg(); "9[K  
  // Dialog Data >4d2IO1\  
  //{{AFX_DATA(CAboutDlg) MwxfTH"wi  
  enum { IDD = IDD_ABOUTBOX }; z]k=sk  
  //}}AFX_DATA Ne]/ sQ0  
  // ClassWizard generated virtual function overrides ; y#6Nx,:  
  //{{AFX_VIRTUAL(CAboutDlg) 6TE R Q  
 protected: ?l_>rSly5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mu1oD;lQ  
  //}}AFX_VIRTUAL pGi "*oZD  
  // Implementation ou44vKzS  
 protected: Z_qs_/y  
  //{{AFX_MSG(CAboutDlg) b; SFnZa8  
  //}}AFX_MSG S.+)">buH  
  DECLARE_MESSAGE_MAP() V*l0| ,9  
}; 4/{Io &|  
~'WvIA (  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) iSxxy1R  
{ 'JEZ;9}  
 //{{AFX_DATA_INIT(CAboutDlg) 4\q7.X+^  
 //}}AFX_DATA_INIT AW LKve_  
} %r5&CUE5?  
Y2Mti- \  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) s)HbBt-  
{ p[e|N;W8A  
 CDialog::DoDataExchange(pDX); +w/Ax[K  
 //{{AFX_DATA_MAP(CAboutDlg) Ep}KIBBO  
 //}}AFX_DATA_MAP O.=~/!(  
} {6<7M  
)o[ O%b  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) yI9l*'  
 //{{AFX_MSG_MAP(CAboutDlg) 6|#^4D)  
 // No message handlers f8! PeQ?  
 //}}AFX_MSG_MAP l;L&ijTQD  
END_MESSAGE_MAP() oll~|J^sg  
)_T[thf]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Sv-}w$  
: CDialog(CCaptureDlg::IDD, pParent) w\Q3h`.  
{ !^ 6x64r  
 //{{AFX_DATA_INIT(CCaptureDlg) L{~L6:6An  
  m_bControl = FALSE; tc@U_>{  
  m_bAlt = FALSE; 5(MWgC1  
  m_bShift = FALSE; >TsJ0E?3x  
  m_Path = _T("c:\\"); %^"Tz,f  
  m_Number = _T("0 picture captured."); IxCEE5+`%  
  nCount=0; .i/]1X*;r^  
  bRegistered=FALSE; (0W%Y Z!&  
  bTray=FALSE; ,"PwNv  
 //}}AFX_DATA_INIT iQ-;0<=G  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Bh*~I_Ta>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z`"UT#^SI  
} ,ewg3mYHC&  
bF' ~&<c  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) UhY )rezh  
{ d\, 4Wet;#  
 CDialog::DoDataExchange(pDX); UL[4sv6\9  
 //{{AFX_DATA_MAP(CCaptureDlg) ~`hI|i<]  
  DDX_Control(pDX, IDC_KEY, m_Key); xP'IyABx  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); =rgWO n8  
  DDX_Check(pDX, IDC_ALT, m_bAlt); #'<I!G  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); h^>kjMM  
  DDX_Text(pDX, IDC_PATH, m_Path); -p ) l63  
  DDX_Text(pDX, IDC_NUMBER, m_Number); O6OP{sb  
 //}}AFX_DATA_MAP 9Pd~  
} a-Cp"pKlVY  
PZpwi?N  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ~>D;2 S(a  
//{{AFX_MSG_MAP(CCaptureDlg) OP2!lEs  
 ON_WM_SYSCOMMAND() da!N0\.1T  
 ON_WM_PAINT() ru(Xeojv#  
 ON_WM_QUERYDRAGICON() 8Mg4y1)RU  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) /Fh"Gl^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) qPE(Lt1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) VR_+/,~  
//}}AFX_MSG_MAP 7^KQQ([  
END_MESSAGE_MAP() D5T\X-+]O  
; Z61|@Y  
BOOL CCaptureDlg::OnInitDialog() ]-%ZN+  
{ ~A8lvuw3  
 CDialog::OnInitDialog(); vG\]xM'u  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); w}NgFrL  
 ASSERT(IDM_ABOUTBOX < 0xF000); A i9*w?C  
 CMenu* pSysMenu = GetSystemMenu(FALSE); K;6K!6J:[  
 if (pSysMenu != NULL) #Opfc8pm'  
 { FPMhHHM  
  CString strAboutMenu; 4,s: G.g  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 'cw0FpQ;  
  if (!strAboutMenu.IsEmpty()) ~c?yHpZx%  
  { 4PD"[a="  
   pSysMenu->AppendMenu(MF_SEPARATOR); UXQ{J5Ox+  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); j\dkv_L  
  } ":7cZ1VN2  
 } 8<!qT1  
 SetIcon(m_hIcon, TRUE); // Set big icon bq[Q  
 SetIcon(m_hIcon, FALSE); // Set small icon /gy;~eB01  
 m_Key.SetCurSel(0); o;];ng  
 RegisterHotkey(); r.i.w0B(  
 CMenu* pMenu=GetSystemMenu(FALSE); 4C01=,6ye  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -ZQ3^'f:0J  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @aCg1Rm  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m1F<L  
 return TRUE; // return TRUE unless you set the focus to a control \U !<-  
} 4N$s vA  
.[2MPjg  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) f[.hN  
{ W]2;5 `MM  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) s7xRry  
 { ~g|e?$j  
  CAboutDlg dlgAbout; h%=b"x  
  dlgAbout.DoModal(); xA!o"VZPq7  
 } $Q{1^  
 else 0M8JE9 Kx  
 { K:y q^T7  
  CDialog::OnSysCommand(nID, lParam); j&T/.]dX&  
 } Vg \-^$  
} a _  
i+&= "Z@  
void CCaptureDlg::OnPaint() ~d5"<`<^o  
{ M8cLh!!  
 if (IsIconic()) _"0n.JQg  
 { y\0^c5}  
  CPaintDC dc(this); // device context for painting t_]UseP$RF  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |!!E5osXq  
  // Center icon in client rectangle /mD KQ<  
  int cxIcon = GetSystemMetrics(SM_CXICON); (sqS(xIY  
  int cyIcon = GetSystemMetrics(SM_CYICON); ljt1:@SN(  
  CRect rect; 3:Z(tM&-O  
  GetClientRect(&rect); cC}s5`  
  int x = (rect.Width() - cxIcon + 1) / 2; @bqCs^U35  
  int y = (rect.Height() - cyIcon + 1) / 2; ?sS'T7r v  
  // Draw the icon -S,dG|  
  dc.DrawIcon(x, y, m_hIcon); YSa:"A  
 } hq,;H40%/  
 else [tD*\\IA  
 { iBo-ANnK9  
  CDialog::OnPaint(); 5\4>H6  
 } o~4n8  
} !zJ.rYZ=g`  
~-:CN(U  
HCURSOR CCaptureDlg::OnQueryDragIcon() rM=Hd/ki5  
{ {eZ j[*P  
 return (HCURSOR) m_hIcon; #[KwR\b{:+  
} :X4\4B*~  
<}mT[;:"  
void CCaptureDlg::OnCancel()  gA[M  
{ ZcWl{e4  
 if(bTray) Y}?@Pm drz  
  DeleteIcon(); E,6E-9  
  CDialog::OnCancel(); rk. UW  
} \FKIEg+(2  
= oh6;Ojt  
void CCaptureDlg::OnAbout() XdS<51 C  
{ $1dI  
 CAboutDlg dlg; |Q I3H]T7  
 dlg.DoModal(); ]cA~%$c89s  
} I9Sh~vTm=u  
h{JVq72R  
void CCaptureDlg::OnBrowse() ^|K*lI/  
{ S}< <jI-z  
 CString str; #TSM#Uqe  
 BROWSEINFO bi; a<o0B{7{BM  
 char name[MAX_PATH]; y]CJOC)/K  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); zp9 ?Ia  
 bi.hwndOwner=GetSafeHwnd(); =f|>7m.p  
 bi.pszDisplayName=name; _$cBI_eA7  
 bi.lpszTitle="Select folder"; HkV/+ {;S~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~%}g"|o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); n=>Gu9`  
 if(idl==NULL) xeH# )QJt  
  return; l|fd,  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); A+}4 N%kh  
 str.ReleaseBuffer(); *FE<'+%  
 m_Path=str; [ho'Pc3A<  
 if(str.GetAt(str.GetLength()-1)!='\\') XM 7zA^-  
  m_Path+="\\";  WcJ{}V9  
 UpdateData(FALSE); tV,zz;* Oe  
} /<2_K4(-{4  
Hb$q}1+y  
void CCaptureDlg::SaveBmp() mzw*6e2T  
{ h/k`+  
 CDC dc; DVS7N_cx2o  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ri^yal<'  
 CBitmap bm; n$?oZ *;  
 int Width=GetSystemMetrics(SM_CXSCREEN); }rQ*!2Y?  
 int Height=GetSystemMetrics(SM_CYSCREEN); G`P+J  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0x & ^{P~  
 CDC tdc; 'oEmbk8Hg  
 tdc.CreateCompatibleDC(&dc); ie ,{C  
 CBitmap*pOld=tdc.SelectObject(&bm); 950b9Vn&  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `^}9= Q'r  
 tdc.SelectObject(pOld); tp]|/cx4  
 BITMAP btm; =@z"k'Vl`  
 bm.GetBitmap(&btm); eo80L  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ( BGipX4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Xo5L:(?K  
 BITMAPINFOHEADER bih; i,HAXPi  
 bih.biBitCount=btm.bmBitsPixel; ,@;<u'1\G  
 bih.biClrImportant=0; gf=*m"5  
 bih.biClrUsed=0; Pn#Lymxh_a  
 bih.biCompression=0; pZjFpd|  
 bih.biHeight=btm.bmHeight; [~o3S$C&7  
 bih.biPlanes=1; -+=8&Wa  
 bih.biSize=sizeof(BITMAPINFOHEADER); Ygl!fC 4b  
 bih.biSizeImage=size; {HU48v"W  
 bih.biWidth=btm.bmWidth; Cnr48ukq  
 bih.biXPelsPerMeter=0; TGLXvP& \  
 bih.biYPelsPerMeter=0; re!CF8 q  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); QHh#O+by#  
 static int filecount=0; DIRCP=5  
 CString name; <f6Oj`{f4  
 name.Format("pict%04d.bmp",filecount++); O`=Uq0Vv  
 name=m_Path+name; FdqUv% (Em  
 BITMAPFILEHEADER bfh; k?#6j1pn  
 bfh.bfReserved1=bfh.bfReserved2=0; 40E[cGz$*  
 bfh.bfType=((WORD)('M'<< 8)|'B'); neBkwXF!  
 bfh.bfSize=54+size; <*+ MBF  
 bfh.bfOffBits=54; ivq4/Y] -X  
 CFile bf; pDLo`F}A  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @RP|?Xc{?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); J\*d4I<(Rt  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7ou^wt+%  
  bf.WriteHuge(lpData,size); iI1t P  
  bf.Close(); Ame%:K!t  
  nCount++; ^:j$p,0e*S  
 } %([c4el>\F  
 GlobalFreePtr(lpData); |(<L!6  
 if(nCount==1) 'zb7:[[7%  
  m_Number.Format("%d picture captured.",nCount); ;'p'8lts  
 else 7`}z7nk  
  m_Number.Format("%d pictures captured.",nCount); 2$91+N*w9  
  UpdateData(FALSE); 1rEP)66N  
} Xwi&uyvU&  
TG9)x|!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Fk(5y)  
{ Kf4z*5Veqr  
 if(pMsg -> message == WM_KEYDOWN) !iw 'tHhR  
 { ^~Sn{esA  
  if(pMsg -> wParam == VK_ESCAPE) f+V':qz  
   return TRUE; "->:6Oe2   
  if(pMsg -> wParam == VK_RETURN) B (falmXJ  
   return TRUE; ~-+Zu<  
 } LDsYr]  
 return CDialog::PreTranslateMessage(pMsg); FScQS.qF  
} ?>Aff`dHY  
D6u>[Z[T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .vO.g/o  
{ Nz;;X\GI  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ c0 |p34  
  SaveBmp(); tp<VOUa  
  return FALSE; [P/gM3*'  
} &; \v_5N6  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ v,&2 !Zv  
 CMenu pop; sFQ|lU"n  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); b5Pn|5AVj  
 CMenu*pMenu=pop.GetSubMenu(0); Q6K)EwN  
 pMenu->SetDefaultItem(ID_EXITICON); U\ued=H  
 CPoint pt; F 4/Uu"J:  
 GetCursorPos(&pt); 8;8}Oq  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); d3GK.8y_z  
 if(id==ID_EXITICON) meR2"JN'  
  DeleteIcon(); M lFvDy  
 else if(id==ID_EXIT) jGn^<T\  
  OnCancel(); Qx;A; n!lw  
 return FALSE; 7o. 'F  
} 3U)8P6Fz  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "tM/`:Qp  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) !U_L7  
 AddIcon(); l i-YkaP  
 return res; O 0#Jl8  
} 9f,:j  
gEP E9ew  
void CCaptureDlg::AddIcon() %S.U`(.  
{ vXbT E$  
 NOTIFYICONDATA data; aTsfl  
 data.cbSize=sizeof(NOTIFYICONDATA); Ao T7sy7  
 CString tip; L])w-  
 tip.LoadString(IDS_ICONTIP); jhv1 D' >6  
 data.hIcon=GetIcon(0); EcIQ20Z_-  
 data.hWnd=GetSafeHwnd(); \]xYV}(FO  
 strcpy(data.szTip,tip); h>:RCpC  
 data.uCallbackMessage=IDM_SHELL; "zbE  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; {M/c!  
 data.uID=98; E,7~kd~y`  
 Shell_NotifyIcon(NIM_ADD,&data); l{9h8]^  
 ShowWindow(SW_HIDE); )_cv}.xe  
 bTray=TRUE; tHbPd.^  
} 9eiBj  
l,wN@Nk  
void CCaptureDlg::DeleteIcon() N_D+d4@  
{ L?x?+HPY.  
 NOTIFYICONDATA data; Z@!W? Ed  
 data.cbSize=sizeof(NOTIFYICONDATA); I&8m5F?$`  
 data.hWnd=GetSafeHwnd(); I})t  
 data.uID=98; C4]%pi  
 Shell_NotifyIcon(NIM_DELETE,&data); 2< Bv=B  
 ShowWindow(SW_SHOW); @88i/ Z_  
 SetForegroundWindow(); vv/,Rgv  
 ShowWindow(SW_SHOWNORMAL); ^z^e*<{WEl  
 bTray=FALSE; I!gj;a?R  
} 9 w1ONw8v  
PU5mz.&0'  
void CCaptureDlg::OnChange() A@(h!Cq  
{ T+RI8.#o  
 RegisterHotkey(); tr8Cx~<  
} + f!,K  
F|TMpH/  
BOOL CCaptureDlg::RegisterHotkey() k&iDJt  
{ MdZgS#`  
 UpdateData(); dM{~Ubb  
 UCHAR mask=0; DA`sm  
 UCHAR key=0; x9l0UD*+g  
 if(m_bControl) mo[<4U ks  
  mask|=4; 2F @)nh  
 if(m_bAlt) xc.D!Iav  
  mask|=2; 9ox|.68q  
 if(m_bShift) :xS&Y\ry  
  mask|=1; siYRRr  
  key=Key_Table[m_Key.GetCurSel()]; + <9 eN  
 if(bRegistered){ <[:7#Yo g  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2 pa3}6P+  
  bRegistered=FALSE; d`uO7jlm  
 } v9m;vWp  
 cMask=mask; +\GZ(!~  
 cKey=key; lk1Gs{(qhH  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); wI@I(r~ g  
 return bRegistered; ]^jdO##M  
} ,Bw)n,  
W#I:j: p  
  四、小结 ,M.!z@  
qlITQKGG  
  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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