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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: cYZwWMzp  
  !T<z'zZU  
  一、实现方法 'dmp4VT3  
"}S9`-Wd|  
  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: [54@irH  
IW5*9)N?  
#pragma data_seg("shareddata") `V]egdO  
HHOOK hHook =NULL; //钩子句柄 u&1j>`~qJ  
UINT nHookCount =0; //挂接的程序数目 =nJOaXR0  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 g2+l@$W  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .'l.7t  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Zk~nB}Xw  
static int KeyCount =0; 1bV2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 T [T6  
#pragma data_seg() w^ixMn~nLF  
*Te4U5F  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 6Y;Y}E  
S 23S.]r  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: :'5G_4y)h  
=giM@MV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :SpG&\+  
cKey,UCHAR cMask) 0MwG}|RC  
{ *4(/t$)pEl  
 BOOL bAdded=FALSE; 03X<x|  
 for(int index=0;index<MAX_KEY;index++){ "\VW. S  
  if(hCallWnd[index]==0){ GOv9 2$e  
   hCallWnd[index]=hWnd; 9F2w.(m  
   HotKey[index]=cKey; c*y$bf<  
   HotKeyMask[index]=cMask; v+xgxQGYH  
   bAdded=TRUE; K!IF?iell  
   KeyCount++; hKk\Y{wv'  
   break; *23m-  
  } 1_Dn?G^H  
 } uS! 35{.>  
 return bAdded; 1$='`@8I  
} '_q: vjX  
//删除热键 _Vdb?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~[ d=s  
{ y)?W-5zL  
 BOOL bRemoved=FALSE; N&0uXrw  
 for(int index=0;index<MAX_KEY;index++){ O ,Pl7x%tK  
  if(hCallWnd[index]==hWnd){ p?dGZ2` [I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <.PPs:{8#  
    hCallWnd[index]=NULL; MZUF! B  
    HotKey[index]=0; dD/29b(  
    HotKeyMask[index]=0; s,UN'~e1  
    bRemoved=TRUE; l|@/?GaH  
    KeyCount--; GibggOj2Q,  
    break; m [g< K  
   } |QAeQWP+1  
  } ,z?<7F1q=  
 } 2a._?(k_y  
 return bRemoved; jMz1s%C  
} 4i+PiD:H  
% +kT  
W2r6jm!  
  DLL中的钩子函数如下: QrNL7{  
L|]w3}ZT@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) w8m8r`h  
{ @e.OU(Bf  
 BOOL bProcessed=FALSE; YLA557~  
 if(HC_ACTION==nCode) IyG = 7  
 { yNhscAMNn  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9A/Kn]s(jj  
   switch(wParam) 8!o{W=m^4  
   {  +E q~X=x  
    case VK_MENU: %!ER@&1f&  
     MaskBits&=~ALTBIT; 0j a  
     break; WuP([8  
    case VK_CONTROL: X/`#5<x  
     MaskBits&=~CTRLBIT; :/yr(V{  
     break; a'_MhJzs  
    case VK_SHIFT: \p>]G[g  
     MaskBits&=~SHIFTBIT; [#hl}q(P#  
     break; 4pfix1F g  
    default: //judge the key and send message rj2r#{[  
     break;  Vq .!(x  
   } Kc JP^  
   for(int index=0;index<MAX_KEY;index++){ c:?#zX  
    if(hCallWnd[index]==NULL) %vf2||a$BS  
     continue; Wvut)T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'K;4102\  
    { |l6<GWG+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); gCk y(4  
     bProcessed=TRUE; =E{{/%u{{S  
    } 9%3 r-U=  
   } s% L" c  
  } RAg|V:/M  
  else if((lParam&0xc000ffff)==1){ //有键按下 n3l"L|W^(<  
   switch(wParam) s{"`=dKT  
   { >?G|Yz*kEJ  
    case VK_MENU: [5RFQ!  
     MaskBits|=ALTBIT; we:5gK &  
     break; 4PO%qO  
    case VK_CONTROL: yv!''F:9F  
     MaskBits|=CTRLBIT; TzevC$m;z  
     break; L!8 -:)0b  
    case VK_SHIFT: DmXDg7y7s  
     MaskBits|=SHIFTBIT; CD8JYiJ  
     break; aiR|.opIb  
    default: //judge the key and send message Kbz7  
     break; 8CnI%_Su  
   } -KIVnV=&m  
   for(int index=0;index<MAX_KEY;index++){ 9U}MXY0  
    if(hCallWnd[index]==NULL) Mk'n~.mb  
     continue; /,rF$5G,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #5ohmp,u  
    { VJ6>3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8H 3!; ]  
     bProcessed=TRUE; q5I4'6NF  
    } 282+1X  
   } +QXYU8bYZ  
  } /8$1[[[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 r.a9W? (E  
   for(int index=0;index<MAX_KEY;index++){ I7G\X#,iz  
    if(hCallWnd[index]==NULL) j;AzkReb  
     continue; <D;H} ef  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Z0F>"Z _qn  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TN |{P  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 l|ZzG4]+l  
   } NqQ(X'W7  
  } ](9{}DHV  
 } n6%jhv9H  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W kDn  
} Ghgv RR$  
St7D.|  
  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: 1)/T.q<D"  
ktw!T{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tZNad  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :`>+f.)  
Z z; <P  
  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: {Jw<<<G  
W &0@&U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) XJxs4a1[t  
{ G%p!os\>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) :WfB!4%!  
 { B 1d%#  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 !(ux.T0  
  SaveBmp(); >D p6@%  
  return FALSE; X^ ^?}>t[  
 } ^zWO[$n}tP  
 …… //其它处理及默认处理 }%>$}4 ,  
} QnP?;  
' ! UF&  
q| =q:4_L  
  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。 |Z7bd^  
t~<-4N$(  
  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。 Y^jnlS)h  
1[gjb((  
  二、编程步骤 P{i8  
l>5]Wd{/  
  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"; h-_0 A]  
[q>i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; y8~)/)l&  
6rN5Xf cS  
  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; }'.Sn{OWf  
S~a:1 _Wl  
  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; WH*=81)zp  
X_sG6Q@  
  5、 添加代码,编译运行程序。 Wse*gO  
DT(Zv2  
三、程序代码 KEVy%AP=*h  
rd 35)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL F{H0 %  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f\F_?s)_y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ?9r,Y;,H  
#if _MSC_VER > 1000 G}dOx}kT  
#pragma once #PLB$$  
#endif // _MSC_VER > 1000 a4a[pX,5  
#ifndef __AFXWIN_H__ m/F(h-?  
#error include 'stdafx.h' before including this file for PCH Zz)oMw  
#endif \I,Dje/:w  
#include "resource.h" // main symbols NX{-D}1X=  
class CHookApp : public CWinApp }Mb'tGW  
{ _F|_C5A  
 public: x+:,b~Skk  
  CHookApp(); 2wuW5H8w{  
  // Overrides zUUxxS_?  
  // ClassWizard generated virtual function overrides _~S^#ut+  
  //{{AFX_VIRTUAL(CHookApp) zju,#%  
 public: "MS`d+rf\  
  virtual BOOL InitInstance(); l6DIsR  
  virtual int ExitInstance(); *~<]|H5~  
  //}}AFX_VIRTUAL 7@y!R   
  //{{AFX_MSG(CHookApp) FiU;>t<)  
  // NOTE - the ClassWizard will add and remove member functions here. wyzBkRg.  
  // DO NOT EDIT what you see in these blocks of generated code ! iJKm27 ">  
  //}}AFX_MSG zm3MOH^a  
  DECLARE_MESSAGE_MAP() ~lalc ^  
}; < ,cIc]eX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); cA*X$j6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q(PT'z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >A(?Pn{|a  
BOOL InitHotkey(); i e)1h  
BOOL UnInit(); i!}nGJGg  
#endif u*-<5& X  
;!Z7-OZX  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. o` 1V  
#include "stdafx.h" s)DNLx  
#include "hook.h" m6Cd^'J9^  
#include <windowsx.h> /'=^^%&:B  
#ifdef _DEBUG 89- 8v^ Pq  
#define new DEBUG_NEW J!fc)h  
#undef THIS_FILE =#")G1A  
static char THIS_FILE[] = __FILE__; 'S D|ObBY  
#endif Y <i}"eI*  
#define MAX_KEY 100 -MW(={#   
#define CTRLBIT 0x04 [qD<U%Hi  
#define ALTBIT 0x02 FQ~ead36C  
#define SHIFTBIT 0x01 E29gnYxu8  
#pragma data_seg("shareddata") nTy,Jml  
HHOOK hHook =NULL; Qbt>}?-  
UINT nHookCount =0; t5v)6|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey GH+FZ (F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;s B:s9M  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )%@WoBRj  
static int KeyCount =0; A8Z?[,Mq!  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift kR~4O$riG  
#pragma data_seg() mF:s-+  
HINSTANCE hins; ABe^]HlH  
void VerifyWindow(); lGHu@(n<  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {ugKv?e ;  
//{{AFX_MSG_MAP(CHookApp) *9{Wn7pck/  
// NOTE - the ClassWizard will add and remove mapping macros here. ihY^~  
// DO NOT EDIT what you see in these blocks of generated code! ecI 2]aKi  
//}}AFX_MSG_MAP {2*l :'  
END_MESSAGE_MAP() +ET  
hsVJ&-#  
CHookApp::CHookApp() Sq8Q *  
{ QDT{Xg* I  
 // TODO: add construction code here, T2_#[bk*d  
 // Place all significant initialization in InitInstance Ihq@|s8  
} a;owG/\p  
V?z{UZkR  
CHookApp theApp; vyOC2c8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `1}?{ud  
{ `iayh  
 BOOL bProcessed=FALSE; wOkJ:k   
 if(HC_ACTION==nCode) lLFBop  
 { {UC<I.5X  
  if((lParam&0xc0000000)==0xc0000000){// Key up RT A=|q  
   switch(wParam) 'CAukk|  
   { i|{nj\6w^  
    case VK_MENU:  p6l@O3  
     MaskBits&=~ALTBIT; TvG:T{jwy  
     break; 3b[+m}UWQ  
    case VK_CONTROL: D!$ =oK  
     MaskBits&=~CTRLBIT; Vyq<T(5  
     break; >A( C9_\  
    case VK_SHIFT: C2|2XL'l(C  
     MaskBits&=~SHIFTBIT; ;Y&?ixx  
     break; XaS_3d  
    default: //judge the key and send message 3$yL+%i  
     break; @`8 B} C  
   } 18tQWI$  
   for(int index=0;index<MAX_KEY;index++){ z'D{:q  
    if(hCallWnd[index]==NULL) Qbpl$L  
     continue; Fsj&/: q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vA-p} ]%  
    { Fj('l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jz7ltoP  
     bProcessed=TRUE; lR2;g:&H  
    } W3/Stt$D  
   } 7b%Cl   
  } K2 K6  
  else if((lParam&0xc000ffff)==1){ //Key down Y@S6m@.$  
   switch(wParam) Vg~ kpgB  
   { }w^ T9OC  
    case VK_MENU: Z=[a 8CU  
     MaskBits|=ALTBIT; )j|y.[  
     break; Z3~*R7G8>  
    case VK_CONTROL: D2 cIVx3:(  
     MaskBits|=CTRLBIT; T*~)9o  
     break; O36r ,/X  
    case VK_SHIFT: 29657k8  
     MaskBits|=SHIFTBIT; 4 Wd5Goe:  
     break; ]3u'Qv}o  
    default: //judge the key and send message ,(W98}nB  
     break; CuO*>g^K[  
   } UKQ&TV}0  
   for(int index=0;index<MAX_KEY;index++) CvWEXY_P2  
   { ?q}wl\"8  
    if(hCallWnd[index]==NULL) JJ=is}S|  
     continue; "{"2h>o#D}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vK7,O%!S  
    { ^J~4~!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); nGgc~E$j  
     bProcessed=TRUE; A1}+j-D7!y  
    } Hf!4(\yN  
   } ER0#$yFpM  
  } Cwf$`?|W  
  if(!bProcessed){ Rj;e82%%N  
   for(int index=0;index<MAX_KEY;index++){ 6="&K_Q7  
    if(hCallWnd[index]==NULL) .p~;U|h"  
     continue; gO!h<1!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) je3n'^m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <7] Y\{+  
   } <@!kR$Rd  
  } `0sk2fn  
 } nJH%pBc  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Jxw:Jk ~  
} :I(gz~u6  
arL&^]JnZ,  
BOOL InitHotkey() G6VHl:e7z  
{ 8%f! X51  
 if(hHook!=NULL){ U(LR('-h  
  nHookCount++; 0)a?W,+O  
  return TRUE; !Y(qpC:$  
 } ;]x5;b9`  
 else JlGD.!`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 7]zZh a4X  
  if(hHook!=NULL) 5mVu]T`  
   nHookCount++; (gB=!1/|G  
  return (hHook!=NULL); bx e97]  
} lD#1"$Coz  
BOOL UnInit() i3j jPN!  
{ .3&OFM  
 if(nHookCount>1){ T-i]O*u  
  nHookCount--; tSa%ZkS  
  return TRUE; K# < Wt5  
 } x99 Oq!  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^V]DY!@k3_  
 if(unhooked==TRUE){ k T>}(G||  
  nHookCount=0; 7Q}@L1A9F,  
  hHook=NULL; F|{?GV%hF  
 } %k)I =|  
 return unhooked; "0)G|pZI  
} pT$AdvI]  
&uW.V+3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3h4"Rv=,  
{ )!-'SH  
 BOOL bAdded=FALSE; e91d~  
 for(int index=0;index<MAX_KEY;index++){ &B7KWvAy  
  if(hCallWnd[index]==0){ mLA$ F4/K  
   hCallWnd[index]=hWnd; YKd?)$J  
   HotKey[index]=cKey; P32'`!/:  
   HotKeyMask[index]=cMask; Y @&nW  
   bAdded=TRUE; wVtBeZa  
   KeyCount++; $Ws2g*i  
   break; Y2&6xTh  
  } B*N8:u  
 } lf# six  
 return bAdded; ]+9:i!s  
} )!72^rl  
dsuW4 ^ l  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jzMGRN/67  
{ HbVm O]#$D  
 BOOL bRemoved=FALSE; OXV@LYP@  
 for(int index=0;index<MAX_KEY;index++){ ;0q6 bp(<H  
  if(hCallWnd[index]==hWnd){ rdg1<Z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -~ Q3T9+  
    hCallWnd[index]=NULL; t}l<#X5  
    HotKey[index]=0; uB5o Ghu-  
    HotKeyMask[index]=0; O0YGjS|d  
    bRemoved=TRUE; 4q8%!\A+  
    KeyCount--; $dw;Kj'\  
    break; CFxs`C^  
   } >i E  
  } \vQ (  
 } n//a;m  
 return bRemoved; r:-WfDz.  
} Z3{Qtysuv3  
5UyK1e))  
void VerifyWindow() r'?&VS-Cj  
{ t$iU|^'uV  
 for(int i=0;i<MAX_KEY;i++){ D40VJ3TUc  
  if(hCallWnd!=NULL){ MWf%Lh;R  
   if(!IsWindow(hCallWnd)){ b1!%xdy_T  
    hCallWnd=NULL; R!CUR~F  
    HotKey=0; v*v&f!Ym&s  
    HotKeyMask=0; Kn|dnq|G  
    KeyCount--; )dcGV$4t[  
   } *A`^ C  
  } 0AenDm@9  
 } XWV~6"  
} rE~O}2a#H  
t[~i})yS  
BOOL CHookApp::InitInstance() / KM+PeO  
{ !<ucwWY,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5S bSz!s`$  
 hins=AfxGetInstanceHandle(); c2"OpI  
 InitHotkey(); YN[D^;}  
 return CWinApp::InitInstance(); ' ?t{-z,  
} 0@;E8^pa  
IRB;Q(Z   
int CHookApp::ExitInstance() `0N/ /Q  
{ \g/E4U .+  
 VerifyWindow(); P6rL;_~e  
 UnInit(); S)?B  I  
 return CWinApp::ExitInstance(); m`aUz}Y>c  
} Ye\%o[X  
%## bg<  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;d:7\  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %l,EA#89 s  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ isqW?$s  
#if _MSC_VER > 1000 d1N&J`R\1  
#pragma once 1>1!oml1E  
#endif // _MSC_VER > 1000 $2 0*&4y^  
o? =u#=  
class CCaptureDlg : public CDialog SZEr  
{ u#QQCgrs  
 // Construction 'WoX-y  
 public: Sob+l'U$  
  BOOL bTray; hQO~9mQ+!  
  BOOL bRegistered; >n/QKFvV5  
  BOOL RegisterHotkey(); +H_Z!T.@  
  UCHAR cKey; nS#;<p$\  
  UCHAR cMask; X8<ygci+.5  
  void DeleteIcon(); GS@ wG  
  void AddIcon(); +8"H%#~  
  UINT nCount; h#>67gJV  
  void SaveBmp(); JaEyVe  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &Jz%L^  
  // Dialog Data Q_S fFsY  
  //{{AFX_DATA(CCaptureDlg) 3? "GH1e  
  enum { IDD = IDD_CAPTURE_DIALOG }; oc.x1<Nd  
  CComboBox m_Key; (RF6K6~  
  BOOL m_bControl; z^]nP 87  
  BOOL m_bAlt; qabM@+m[  
  BOOL m_bShift; eZHi6v)i  
  CString m_Path; =Ur/v'm  
  CString m_Number; fO+;%B  
  //}}AFX_DATA va)\uXW.N  
  // ClassWizard generated virtual function overrides &o(? }W  
  //{{AFX_VIRTUAL(CCaptureDlg) XOoND  
 public: v,s]:9f`\>  
  virtual BOOL PreTranslateMessage(MSG* pMsg); &fWZ%C7|jC  
 protected: 71eD~fNdx  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support azSS:=A  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `YJ`?p  
  //}}AFX_VIRTUAL g6S8@b))|  
  // Implementation \AG ,dMS  
 protected: ' x|B'  
  HICON m_hIcon; ~$5[#\5%G  
  // Generated message map functions #t\Oq9}^  
  //{{AFX_MSG(CCaptureDlg) #"jWPe,d  
  virtual BOOL OnInitDialog(); zR:S.e<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3j2}n o8O  
  afx_msg void OnPaint(); H$ v4N8D8I  
  afx_msg HCURSOR OnQueryDragIcon(); SU1, +7"  
  virtual void OnCancel(); 7@ZL(G  
  afx_msg void OnAbout(); /3fo=7G6  
  afx_msg void OnBrowse(); *E>YLkg]  
  afx_msg void OnChange(); [Gu]p&  
 //}}AFX_MSG =i.[|g"  
 DECLARE_MESSAGE_MAP() GlaWBF#  
}; \J6T:jeS,  
#endif X~x]VKr/  
t C&Xm}:  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _ ge3R3  
#include "stdafx.h" SYyH_0N  
#include "Capture.h" rv^j&X+EH  
#include "CaptureDlg.h" *fx<>aK  
#include <windowsx.h> nBQG.3  
#pragma comment(lib,"hook.lib") VFyt9:a  
#ifdef _DEBUG }=++Lr4*  
#define new DEBUG_NEW m{' q(w}  
#undef THIS_FILE }b44^iL$9y  
static char THIS_FILE[] = __FILE__; tNtP+v-{  
#endif X|b~,X%N  
#define IDM_SHELL WM_USER+1 FT=w`NE,+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); StE4n0V  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UJQ!~g.y]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ks! G \<I  
class CAboutDlg : public CDialog tTY(I1  
{ 7oUYRqd  
 public: 4&?%"2  
  CAboutDlg(); BPW:W }  
  // Dialog Data g{&ux k);  
  //{{AFX_DATA(CAboutDlg) OUD<+i,  
  enum { IDD = IDD_ABOUTBOX }; U*zjEY:A  
  //}}AFX_DATA (FBKP#x)^  
  // ClassWizard generated virtual function overrides 1=s%.0  
  //{{AFX_VIRTUAL(CAboutDlg) ]+oPwp;il  
 protected: p%n}a%%I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support HYtkSsXLN  
  //}}AFX_VIRTUAL 9nB:=`T9  
  // Implementation t4nAy)I)P  
 protected: %_5B"on  
  //{{AFX_MSG(CAboutDlg) %H:!/'45  
  //}}AFX_MSG  N3E=t#n  
  DECLARE_MESSAGE_MAP() o zv><e#  
}; Lq yY??\@  
_m@QeO'yh  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) K'y;j~`-  
{ jn]{|QZ  
 //{{AFX_DATA_INIT(CAboutDlg) z}Xn>-N-  
 //}}AFX_DATA_INIT ?g!py[CrE  
} norWNm(n  
W"$'$ h  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) G|.>p<q   
{ <pz;G}  
 CDialog::DoDataExchange(pDX); $U<xrN>O  
 //{{AFX_DATA_MAP(CAboutDlg) ,Xao{o(  
 //}}AFX_DATA_MAP CfAX,f"ZP  
} m(?M]CH(A  
A|jaWZM-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) /mvuSNk  
 //{{AFX_MSG_MAP(CAboutDlg) ZNzye1JSm  
 // No message handlers @ %kCe>r  
 //}}AFX_MSG_MAP IGVNX2  
END_MESSAGE_MAP() %U'YOE6  
b{9q   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) m39 `f,M  
: CDialog(CCaptureDlg::IDD, pParent) >Efv?8$E\  
{ 5`0tG;  
 //{{AFX_DATA_INIT(CCaptureDlg) ]^"*Fdn  
  m_bControl = FALSE; i9_ZK/*  
  m_bAlt = FALSE; :o=[Zp~B4d  
  m_bShift = FALSE; C";F's)  
  m_Path = _T("c:\\"); MAhcwmZNy  
  m_Number = _T("0 picture captured."); >lRX+?  
  nCount=0; T0v;8E e  
  bRegistered=FALSE; u3Ua>A-  
  bTray=FALSE;  &+u$96  
 //}}AFX_DATA_INIT x# 0(CcKK  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 GV* B$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?> }bg  
} 2\W[ ItxL0  
]V?\Qv/.=  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ](:aDHa  
{ q*,];j/>k  
 CDialog::DoDataExchange(pDX); YcT!`B   
 //{{AFX_DATA_MAP(CCaptureDlg) &ciU`//`  
  DDX_Control(pDX, IDC_KEY, m_Key); ]k5l]JB  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $#1i@dI  
  DDX_Check(pDX, IDC_ALT, m_bAlt); <S%M*j  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -Y{P"!p0  
  DDX_Text(pDX, IDC_PATH, m_Path); nUD)G<v  
  DDX_Text(pDX, IDC_NUMBER, m_Number); d0eMDIm3R\  
 //}}AFX_DATA_MAP | x/,  
} $Ic: c  
l}># p'$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Y;4nIWe JL  
//{{AFX_MSG_MAP(CCaptureDlg) O:WFh;c  
 ON_WM_SYSCOMMAND() fHdPav f,S  
 ON_WM_PAINT() )EcE{!H6+  
 ON_WM_QUERYDRAGICON() Ag^Cb'3X  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) z`]'~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) JiCDY)bu  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Q >] v?4  
//}}AFX_MSG_MAP F`r=M%yh  
END_MESSAGE_MAP() yuWoz*:t  
 5k{a(I  
BOOL CCaptureDlg::OnInitDialog() ANZD7v6a  
{ d\+smED  
 CDialog::OnInitDialog(); (g*2OS  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Vnlns2pQl  
 ASSERT(IDM_ABOUTBOX < 0xF000); UF3WpA  
 CMenu* pSysMenu = GetSystemMenu(FALSE); aPWlV= oG  
 if (pSysMenu != NULL) _py%L+&{  
 { lZ'-?xo  
  CString strAboutMenu; +eg$Z]Lht  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8lh{ R  
  if (!strAboutMenu.IsEmpty()) -=I*{dzly  
  { B>Mr /'  
   pSysMenu->AppendMenu(MF_SEPARATOR); p eQD]v  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Tj$D:xKf)  
  } =rFgOdj  
 } 3FR'N%+  
 SetIcon(m_hIcon, TRUE); // Set big icon <sE0426 {  
 SetIcon(m_hIcon, FALSE); // Set small icon @.6l^"L  
 m_Key.SetCurSel(0); c%n[v3]  
 RegisterHotkey(); <H::{  
 CMenu* pMenu=GetSystemMenu(FALSE); ;Z\jX[H  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); % V/J6  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ]W-l1  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); P33x/#VVE  
 return TRUE; // return TRUE unless you set the focus to a control p(fYpD  
} R-+k>_96|  
/:iO:g1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) QK)"-y}"g  
{ ZaBGkDX5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3iMh)YH5b  
 { sg RY`U.C  
  CAboutDlg dlgAbout; ZnVi.s ~1V  
  dlgAbout.DoModal(); I4.^I/c(  
 } 5B)Z@-x2  
 else I@76ABu^  
 { zc%#7"FM  
  CDialog::OnSysCommand(nID, lParam); &W)Lzpx8c  
 } 96x0'IsaG  
} t>:2F,0K9  
c4E=qgP  
void CCaptureDlg::OnPaint() cD{I*t$  
{ Y5M>&}N  
 if (IsIconic()) }%Dsy2:y  
 { BuII|j  
  CPaintDC dc(this); // device context for painting Nz %{T  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~ x- R78'  
  // Center icon in client rectangle ;& ny< gQ  
  int cxIcon = GetSystemMetrics(SM_CXICON); M[LjN  
  int cyIcon = GetSystemMetrics(SM_CYICON); z'GYU=  
  CRect rect; B/hL  
  GetClientRect(&rect); N,6(|,m  
  int x = (rect.Width() - cxIcon + 1) / 2; $\h\, N$y  
  int y = (rect.Height() - cyIcon + 1) / 2; zcnp?%  
  // Draw the icon ^W+q!pYM9+  
  dc.DrawIcon(x, y, m_hIcon); t=J WD2  
 } fS+Ga1CsH  
 else =QXLr+ y@  
 { bq{":[a  
  CDialog::OnPaint(); U2l7@uDr;  
 } "$#X[ .  
} ]c%yib  
})f4`$qf  
HCURSOR CCaptureDlg::OnQueryDragIcon() B/u0^!  
{ JFf*v6:,  
 return (HCURSOR) m_hIcon; @5jJoy(mX@  
} Exd$v"s Y  
6fV%[.RR  
void CCaptureDlg::OnCancel() 9un* 1%  
{ kW=g:m  
 if(bTray) Yz4)Q1  
  DeleteIcon(); MM8@0t'E  
  CDialog::OnCancel(); R%B"Gtl)  
} L>VZ-j  
0EiURVX  
void CCaptureDlg::OnAbout() oU[Ba8qh  
{ y8=p;7DY  
 CAboutDlg dlg; GZXBzZ}  
 dlg.DoModal(); O&h3=?O&B  
} =g| e- XC  
t-7^deG'/n  
void CCaptureDlg::OnBrowse() +s?0yH-%p  
{ e%. Xya#\  
 CString str; Hg$t,\j  
 BROWSEINFO bi; #'m&<g,  
 char name[MAX_PATH]; m:U.ao6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); v%N/mL+5L  
 bi.hwndOwner=GetSafeHwnd(); aD)XxXwozm  
 bi.pszDisplayName=name; k/[*Wz$W  
 bi.lpszTitle="Select folder"; CGmObN8~'F  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; M\\t)=q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); c 4Q{  
 if(idl==NULL) mRVE@ pc2X  
  return; #m yiZL %  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &s m7R i  
 str.ReleaseBuffer(); HRP4"#9R  
 m_Path=str; ]r++YIg!j  
 if(str.GetAt(str.GetLength()-1)!='\\') 4JF)w;X}  
  m_Path+="\\"; mHcxK@qw  
 UpdateData(FALSE); e`gOc*  
} |Yq0zc!  
C/AqAW1  
void CCaptureDlg::SaveBmp() uLFnuK  
{ rz/^_dV  
 CDC dc; A0Z<1|6r*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &+F|v(|r  
 CBitmap bm; . !gkJ  
 int Width=GetSystemMetrics(SM_CXSCREEN); LS1r}cl  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5cLq6[uO  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  Z|zyO-  
 CDC tdc; t [gz#'  
 tdc.CreateCompatibleDC(&dc); " p]bsJG  
 CBitmap*pOld=tdc.SelectObject(&bm); 7)iB6RB K  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &.XYI3Ab1  
 tdc.SelectObject(pOld); o&M2POI~q  
 BITMAP btm; 4?Mb>\n%<^  
 bm.GetBitmap(&btm); w D|p'N  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; pbg[\UJyd  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :9`'R0=i^  
 BITMAPINFOHEADER bih; llG^+*Y8t  
 bih.biBitCount=btm.bmBitsPixel; .-Y3oWV  
 bih.biClrImportant=0; S<), ,(  
 bih.biClrUsed=0; FtBYPSGz  
 bih.biCompression=0; "{a-I=s\C  
 bih.biHeight=btm.bmHeight; 7kDX_,i  
 bih.biPlanes=1; Ph[P$: 9  
 bih.biSize=sizeof(BITMAPINFOHEADER); :0K[fBa  
 bih.biSizeImage=size; m|mY_t  
 bih.biWidth=btm.bmWidth; V/%tFd1  
 bih.biXPelsPerMeter=0; YbS$D  
 bih.biYPelsPerMeter=0; HzADz%~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \;w$"@9  
 static int filecount=0; ^H]q[XFR  
 CString name; )C>4? )  
 name.Format("pict%04d.bmp",filecount++); ^(,qkq'u D  
 name=m_Path+name; `<R;^qCt  
 BITMAPFILEHEADER bfh; p4} ,xQzB  
 bfh.bfReserved1=bfh.bfReserved2=0; eK]g FXk  
 bfh.bfType=((WORD)('M'<< 8)|'B'); M#v#3:&5  
 bfh.bfSize=54+size; gcLwQ-  
 bfh.bfOffBits=54; ;O8Uc&:P  
 CFile bf; m e\S:  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ G)qNu}  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); w[g(8 #*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); yO@KjCv"  
  bf.WriteHuge(lpData,size); m~KGB"  
  bf.Close(); ym*,X@Qg^  
  nCount++; (#zSVtZ  
 } Rx';P/F0C  
 GlobalFreePtr(lpData); b-sbRR  
 if(nCount==1) n<Vq@=9AE  
  m_Number.Format("%d picture captured.",nCount); WxNPAJ6YH  
 else 6k?,'&z|~  
  m_Number.Format("%d pictures captured.",nCount); z}XmRc_Ko  
  UpdateData(FALSE); D$k<<dvv  
} >:5^4/fo*  
Vs>/q:I  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) UsT+o  
{ ?sF<L/P0 F  
 if(pMsg -> message == WM_KEYDOWN) !@ERAPuk  
 { ;Dl< GW3<  
  if(pMsg -> wParam == VK_ESCAPE) "T>74bj_|Q  
   return TRUE; K@Z K@++  
  if(pMsg -> wParam == VK_RETURN) V*an0@  
   return TRUE; SSi-Z  
 } ~(%TQY5  
 return CDialog::PreTranslateMessage(pMsg); 'G3;!xk$  
} :\ %.x3T'  
^4jIT1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f? sW^ d;  
{ 4[@`j{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j 8lWra\y  
  SaveBmp(); -b1VY4m-  
  return FALSE; o_un=ygU  
} ,`<w#  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ lWYZAF>?Ym  
 CMenu pop; 3hzI6otKS  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qEd!g,Sx  
 CMenu*pMenu=pop.GetSubMenu(0); AEjkqG4qv  
 pMenu->SetDefaultItem(ID_EXITICON); ts2;?`~  
 CPoint pt; &r0b~RwUv  
 GetCursorPos(&pt); VUfV=&D-*g  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); eBZ^YY<*g  
 if(id==ID_EXITICON) hdFIriE3  
  DeleteIcon(); L2v j)(  
 else if(id==ID_EXIT) d,"?tip/SX  
  OnCancel(); \Qp #utC0s  
 return FALSE; x)'4u6;d  
} etY/K0  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {? -@`FR-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ] i;xeo,  
 AddIcon(); WdXi  
 return res; C %l!"s^  
} KH4 5A'o  
PA5_  
void CCaptureDlg::AddIcon() O0?.$f9 s  
{ NL})_.Og  
 NOTIFYICONDATA data; ~b}@*fq  
 data.cbSize=sizeof(NOTIFYICONDATA); wKe$(>d"L  
 CString tip; &_Py{Cv@Dw  
 tip.LoadString(IDS_ICONTIP); e}qG_*  
 data.hIcon=GetIcon(0); [UJC/GtjS  
 data.hWnd=GetSafeHwnd(); fV[(s7vW  
 strcpy(data.szTip,tip); @=KuoIV  
 data.uCallbackMessage=IDM_SHELL; +8+@Az[e0  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2FHWOy /N@  
 data.uID=98; v634{:'e  
 Shell_NotifyIcon(NIM_ADD,&data); B1]5%B  
 ShowWindow(SW_HIDE); [<~1.L^I  
 bTray=TRUE; W}6(;tI  
} _sU|<1  
l V[d`%(  
void CCaptureDlg::DeleteIcon() {3RY4HVT?  
{ sS$"6  
 NOTIFYICONDATA data; AF5$U8jf  
 data.cbSize=sizeof(NOTIFYICONDATA); !f~ =p  
 data.hWnd=GetSafeHwnd(); ]fH U/%  
 data.uID=98; )wU.|9o]M  
 Shell_NotifyIcon(NIM_DELETE,&data); JX_hLy@`  
 ShowWindow(SW_SHOW); e/@tU'$  
 SetForegroundWindow(); p"9a`/  
 ShowWindow(SW_SHOWNORMAL); Vmj7`w&  
 bTray=FALSE; ;lqtw]4v  
} Y)@mL~){  
`I$'Lp#5  
void CCaptureDlg::OnChange() )+]8T6~ N  
{ q$vATT  
 RegisterHotkey(); S4RvWTtQV  
} m&)5QX  
L(tA~Z"k  
BOOL CCaptureDlg::RegisterHotkey() _= RA-qZ"  
{ _is<.&f6  
 UpdateData(); 74*1|S <  
 UCHAR mask=0; }]w/`TF  
 UCHAR key=0; e|:#Y^  
 if(m_bControl) N>z<v\`  
  mask|=4; b2;+a(  
 if(m_bAlt) k/+-Tq;  
  mask|=2; Z5aU7  
 if(m_bShift) A^+G w\  
  mask|=1; fFD:E} >5  
  key=Key_Table[m_Key.GetCurSel()]; ?haN ;n6'  
 if(bRegistered){ QG\lXY,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); k%w5V>]1  
  bRegistered=FALSE; G #.(% ,  
 } 4&r+K`C0  
 cMask=mask; 0T,Qn{  
 cKey=key; sW)C6 #  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); dI!x Ai  
 return bRegistered; @=o1q=5@8  
} Q9X7- \n  
bSmF"H0cP  
  四、小结 FY%v \`@1*  
/{pVYY  
  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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