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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: $&i8/pD  
  L(C0236r  
  一、实现方法 jHV) TBr  
L D%SLJ:  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 8?w#=@s  
t Q.%f:|  
#pragma data_seg("shareddata") Hr \vu`p$  
HHOOK hHook =NULL; //钩子句柄 >D_)z/v?"  
UINT nHookCount =0; //挂接的程序数目 |EY1$qItid  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Ql,WKoj*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x Vw1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey klTRuU(  
static int KeyCount =0; Jn9 {@??  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Oe;1f#` 5  
#pragma data_seg() V}FH5z |  
rmdg~  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 &3itBQF  
E#cu}zi  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 2Tv W 6  
*T.V5FB0S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  O@skd2  
cKey,UCHAR cMask) s~c cx"HH  
{ pi/&WMZ<  
 BOOL bAdded=FALSE; uX6rCokr  
 for(int index=0;index<MAX_KEY;index++){ Ty*+?#`  
  if(hCallWnd[index]==0){ H)Z$j&S{  
   hCallWnd[index]=hWnd; FMitIM*]   
   HotKey[index]=cKey; {J/+KK  
   HotKeyMask[index]=cMask; X9rao n  
   bAdded=TRUE; .s|5AC[  
   KeyCount++; l(}l([rdQ  
   break; SjcX|=S  
  } ZbH_h]1$D  
 } IU"8.(;o  
 return bAdded; \@zoM:[sN  
} ('.I)n  
//删除热键 g9IIC5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9QeBz`lm)  
{ #(Yd'qKo  
 BOOL bRemoved=FALSE; xX8 c>p  
 for(int index=0;index<MAX_KEY;index++){ 8L`wib2  
  if(hCallWnd[index]==hWnd){ WY26Iq@C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V h5\'Sn  
    hCallWnd[index]=NULL; 4%6@MQ[  
    HotKey[index]=0; 8A 'SMJi  
    HotKeyMask[index]=0; LwH+X:?i  
    bRemoved=TRUE; T7(d  
    KeyCount--; <irr .O  
    break; )[=C@U  
   } T ^/\Rr  
  } KSU hB  
 } }hXmK.['  
 return bRemoved; CU/Id`"tW  
} D"{%[;J  
{9~3y2:  
m,F4N$  
  DLL中的钩子函数如下: uTy00`1  
:1~4X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =n;LP#(h?  
{ [5GzY`/m  
 BOOL bProcessed=FALSE; m5W':vM  
 if(HC_ACTION==nCode) tNAmA  
 { vI(CX]o  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 +77j2W_0  
   switch(wParam) UAC"jy1D  
   {  Seq ^o=  
    case VK_MENU: mw83pU6  
     MaskBits&=~ALTBIT; xzf/W+.>.  
     break; ? O9|  
    case VK_CONTROL: CH6;jo]  
     MaskBits&=~CTRLBIT; #z c$cr  
     break; g c<Y?a-  
    case VK_SHIFT: >Hd!o"I  
     MaskBits&=~SHIFTBIT; `mquGk|)  
     break; ]oKHS$W9  
    default: //judge the key and send message ];u nR<H  
     break; k:&B b"  
   } Zb+n\sv4  
   for(int index=0;index<MAX_KEY;index++){ - P4X@s_;  
    if(hCallWnd[index]==NULL) {$C"yksr  
     continue; ^+Vf*YY 8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z%$M IC  
    { [] R8VC>Ah  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); e )]  
     bProcessed=TRUE; v\5`n@}4  
    } gbu)bqu2x  
   } Z_Y gV:jc  
  } d;).| .}P  
  else if((lParam&0xc000ffff)==1){ //有键按下 bFJ>+ {#  
   switch(wParam) l^__oam  
   { Q%0 N\  
    case VK_MENU: 9 ]|C$;kw@  
     MaskBits|=ALTBIT; 2hb>6Z;r]K  
     break; !@FzP@  
    case VK_CONTROL: ~{t<g;F  
     MaskBits|=CTRLBIT; k jx<;##R8  
     break; AzSmfEaU0  
    case VK_SHIFT: /7WdG)'  
     MaskBits|=SHIFTBIT; 1CS\1[E  
     break; Hr*xAx  
    default: //judge the key and send message t24.u+O  
     break; w[u>*I  
   } |zy` ]p9  
   for(int index=0;index<MAX_KEY;index++){ +O7GgySx  
    if(hCallWnd[index]==NULL) (b7',:_U7  
     continue; nlc$"(eA[H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `F_R J.g*p  
    { ;/!o0:m^I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I-W ,C &J>  
     bProcessed=TRUE; L^Fb;sJYI  
    } BoHNni  
   } L$@qEsO  
  } K!v\r"N  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )~ ^`[`  
   for(int index=0;index<MAX_KEY;index++){ {gB9EGY  
    if(hCallWnd[index]==NULL) 7 LiyA<  
     continue; )c<[@ ::i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ##s :Ww  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); EU'P U  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "!:)qVL^  
   } <Kk?BRxi  
  } |J~A )Bw?  
 } r<DPh5ReY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S)`@)sr  
} ]<u%jTQREd  
cEK#5   
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: FaKZ|~Y e  
RP9~n)h~b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !14l[k+\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %Lp#2?*  
f;bVzti+w  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: .+5;AtN  
dA0o{[o=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ob9=/ R?i  
{ Eg1|Kg\&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) vg5fMH9ZZ  
 { zG<>-?q~'  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Q$Q:Jm53  
  SaveBmp(); a#&\65D  
  return FALSE; N"zl7.E  
 } <WL] (-9I:  
 …… //其它处理及默认处理 GYV%RD#  
} J4?SC+\  
/Y [ b8f  
fBKN?]BdN  
  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。 fbkAu  
~31-)*tJ]  
  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。 -$`q:j  
iAXF;'|W  
  二、编程步骤 g>{t>B%v^K  
BfQ#5  
  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"; =27ZY Z  
b 2~5LZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; bUc ++M  
ZpZoOdjslV  
  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; J,k.*t:  
#_zj5B38E  
  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; 8x9;3{R   
r(g2&}o\  
  5、 添加代码,编译运行程序。 ^O**ZndB/  
Kp6%=JjO  
三、程序代码 ULxgvq  
L tK,_j  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +>:[irf  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) U \jFB*U  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /L` +  
#if _MSC_VER > 1000 v5.KCc}"  
#pragma once ;s5JYR  
#endif // _MSC_VER > 1000 _w7yfZLv+  
#ifndef __AFXWIN_H__ :*J!  
#error include 'stdafx.h' before including this file for PCH ?*cCn-|  
#endif TZarI-A  
#include "resource.h" // main symbols cq8JpSB(  
class CHookApp : public CWinApp MFqb_q+  
{ jr^btVOI#\  
 public: v5*JBW+c*  
  CHookApp(); J?f7!F:8  
  // Overrides KnUVR!H|  
  // ClassWizard generated virtual function overrides (1%A@ 4  
  //{{AFX_VIRTUAL(CHookApp) i \@a&tw  
 public: \sS0@gnDI  
  virtual BOOL InitInstance(); MkM`)g 5  
  virtual int ExitInstance(); `=2p6<#z  
  //}}AFX_VIRTUAL BKu< p<  
  //{{AFX_MSG(CHookApp) :%IB34e  
  // NOTE - the ClassWizard will add and remove member functions here. | zOwC9-6  
  // DO NOT EDIT what you see in these blocks of generated code ! RIFTF R  
  //}}AFX_MSG KR>o 2  
  DECLARE_MESSAGE_MAP() Oki{)Ssy  
}; LVJn2t^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); BxesoB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~zQxfl/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ghW  
BOOL InitHotkey(); 'v5q/l  
BOOL UnInit(); l_P90zm39!  
#endif lO HW9Z  
rf]x5%ij  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2FR 5RG oD  
#include "stdafx.h" 5`q#~fJ2  
#include "hook.h" RJdijj  
#include <windowsx.h> }w{E<C(M  
#ifdef _DEBUG d5n>2iO  
#define new DEBUG_NEW W4)bEWO+q  
#undef THIS_FILE )g`~,3G  
static char THIS_FILE[] = __FILE__; ix5<h }  
#endif d1 lxz?r  
#define MAX_KEY 100 >C`#4e?}  
#define CTRLBIT 0x04 i_av_I-  
#define ALTBIT 0x02 mBQpf/PG  
#define SHIFTBIT 0x01 \Npvm49  
#pragma data_seg("shareddata") 593!;2/@  
HHOOK hHook =NULL; @IOl0db  
UINT nHookCount =0; ?h,.1Tb  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %I@ vMs^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `)TgGny01  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9G4os!x)  
static int KeyCount =0; aTs9lr:  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \xmDkWzE  
#pragma data_seg() {"db1Gbfg  
HINSTANCE hins; NosOd*S  
void VerifyWindow(); lLI%J>b@  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Ti>}To}B5  
//{{AFX_MSG_MAP(CHookApp) }$s QmR R  
// NOTE - the ClassWizard will add and remove mapping macros here. t;_1/ mt  
// DO NOT EDIT what you see in these blocks of generated code! k;r[m ,$  
//}}AFX_MSG_MAP W3n[qVZIC  
END_MESSAGE_MAP() {,= hIXo>  
Mo4c8wp&SM  
CHookApp::CHookApp() =`l><  
{ Bf" ZmG9  
 // TODO: add construction code here, }sp?@C,Z  
 // Place all significant initialization in InitInstance |7!Bk$(vA  
} {*nE8+..A  
j?VHR$  
CHookApp theApp; UU ' 9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *p|->p6,u  
{ m/`L3@7Tt  
 BOOL bProcessed=FALSE; 8yM8O #S  
 if(HC_ACTION==nCode) #;UoZJ B  
 { rY)m"'puP  
  if((lParam&0xc0000000)==0xc0000000){// Key up zR?1iV.]  
   switch(wParam) TJuS)AZ C  
   { }xY|z"&  
    case VK_MENU: o%K1!'  
     MaskBits&=~ALTBIT; a&[>kO  
     break; R9UC0D:-x  
    case VK_CONTROL: epcvwM/A  
     MaskBits&=~CTRLBIT; #*3 vE& p  
     break; J~ wu*x  
    case VK_SHIFT: Ad4-aWH  
     MaskBits&=~SHIFTBIT; ;XXEvRk  
     break; X"%eRW&qu/  
    default: //judge the key and send message i'}"5O+  
     break; ,.&D{ $1W  
   } U[:Js@uH_  
   for(int index=0;index<MAX_KEY;index++){ >uE<-klv  
    if(hCallWnd[index]==NULL) T%**:@}+  
     continue; H-8_&E?6m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y/+y |.Xg  
    { +:u &]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,u14R]  
     bProcessed=TRUE; !0cb f&^:  
    } d%oHcn  
   } zF&_9VNk=c  
  } Po.izE!C  
  else if((lParam&0xc000ffff)==1){ //Key down OO;I^`Yn  
   switch(wParam) ,|w,  
   { bLUyZ3m!  
    case VK_MENU: _;-b ZH  
     MaskBits|=ALTBIT; ZV[-$  
     break; iF1zLI<A  
    case VK_CONTROL: UBx0Z0Y  
     MaskBits|=CTRLBIT; +Xmza8T9  
     break; M ED_#OS  
    case VK_SHIFT: $ccCI \  
     MaskBits|=SHIFTBIT; DMT2~mh  
     break; H#QPcp@  
    default: //judge the key and send message q&,uJo  
     break; '@#l/9  
   } UDb  
   for(int index=0;index<MAX_KEY;index++) U"K%ip:Wd  
   { W}k)5<C4v  
    if(hCallWnd[index]==NULL) Qa1G0qMEIF  
     continue; p0HcuB)Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ['I5(M@  
    { ;AT~?o`n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L(BL_  
     bProcessed=TRUE; r7v 1q  
    } {!"lHM%  
   } 7] 17?s]t,  
  } i\\,Z L  
  if(!bProcessed){ 9>d~g!u=  
   for(int index=0;index<MAX_KEY;index++){ 6)9X+U@  
    if(hCallWnd[index]==NULL) OWmI$_L  
     continue; 8uB6C0,6?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) UujKgL4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )eBCO~HS  
   } ra{HlB{  
  } QkY;O<Y_  
 } _({K6adb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \05 n$.  
} )H<F([Jri  
ffh3okyW0  
BOOL InitHotkey() g=kuM  
{ T28Q(\C:}  
 if(hHook!=NULL){  Qs\!Kk@  
  nHookCount++; 3d>xg%?  
  return TRUE; %<'PSri  
 } ]q@W(\I  
 else Y_M3-H=0  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); QCvst*  
  if(hHook!=NULL) ziD+% -  
   nHookCount++; |dk9/xdX  
  return (hHook!=NULL); bOdyrynh  
} [214b=  
BOOL UnInit() {b26DKkQS  
{ @m ?&7{y#?  
 if(nHookCount>1){ qeoj  
  nHookCount--; _iW-i  
  return TRUE; REKv&^FLN  
 } t+ O7dZt%r  
 BOOL unhooked = UnhookWindowsHookEx(hHook); T~-PT39E  
 if(unhooked==TRUE){ d i#:KW  
  nHookCount=0; sBWLgJz?C  
  hHook=NULL; X5Ff2@."y|  
 } mi$*,fz  
 return unhooked; 3']=w@~ O[  
} @`#"6y?  
*6 1G<I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7%Ii:5Bp  
{ s4Y7x.-  
 BOOL bAdded=FALSE; wU bLw  
 for(int index=0;index<MAX_KEY;index++){ +G<9|-  
  if(hCallWnd[index]==0){ Z\P&i#  
   hCallWnd[index]=hWnd; eXZH#K7S#  
   HotKey[index]=cKey; +UC-  
   HotKeyMask[index]=cMask; V/i7Zh#2:  
   bAdded=TRUE; $4*k=+wS  
   KeyCount++; i2+vUl|;Z  
   break; Mny mV;y"  
  } F B7.b  
 } 0'.7dzz  
 return bAdded; >\c"U1%E  
} Cz1o@ rt  
4mJ[Wr\y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) d 1bx5U  
{ G%RhNwm  
 BOOL bRemoved=FALSE; L;s,xV  
 for(int index=0;index<MAX_KEY;index++){ 8st~ O  
  if(hCallWnd[index]==hWnd){ b".e6zev  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t=$Hv  
    hCallWnd[index]=NULL; fA>FU/r  
    HotKey[index]=0; wX*F'r"z  
    HotKeyMask[index]=0; }c~o3t(7`b  
    bRemoved=TRUE; V[N4 {c  
    KeyCount--; woCFkO;'O  
    break; ' ;PHuMY#X  
   } z4 yV1  
  } C0@[4a$8f  
 } 4(FEfde=  
 return bRemoved; N N;'QiE  
} p+>vX X  
zU$S#4/C  
void VerifyWindow() 5*W<6ia  
{ 4q7hL  
 for(int i=0;i<MAX_KEY;i++){ HQO z  
  if(hCallWnd!=NULL){ X}s}E ;v9  
   if(!IsWindow(hCallWnd)){ 1SYBq,[])  
    hCallWnd=NULL; @ s2<y@  
    HotKey=0; 6#rj3^]  
    HotKeyMask=0; (ug^2WG Yq  
    KeyCount--; GE{u2<%@  
   } V!94I2%#x  
  } y! lEGA7  
 } wUbs9y<  
} $ }D9)&f;  
X^;LiwQv  
BOOL CHookApp::InitInstance() L~])?d  
{ ;^K4kK&f  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); BbqH02i  
 hins=AfxGetInstanceHandle(); jZ8#86/#{  
 InitHotkey(); ^Q'^9M2)  
 return CWinApp::InitInstance(); rcWr0q  
} J^R#  
jml 4YaGZ  
int CHookApp::ExitInstance() ~J Xqyw}  
{ ]"Qm25`Qz  
 VerifyWindow(); [N-t6Z*  
 UnInit(); 'kz[Gh*8  
 return CWinApp::ExitInstance(); .jfkOt?2  
} rz @;Zn  
E4nj*Lp~+  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ??!+2G#%!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7Q(5Nlfcz  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ /5y*ZIq]e  
#if _MSC_VER > 1000 &Jr~ )o   
#pragma once uNV\_'9>Y  
#endif // _MSC_VER > 1000 SbLx`]rI  
Y0||>LX  
class CCaptureDlg : public CDialog $1h,<$5H  
{ T@ [*V[  
 // Construction JDyP..Dt  
 public: nzdJ*C  
  BOOL bTray; 0pSqk/  
  BOOL bRegistered; k8}*b&+{vz  
  BOOL RegisterHotkey(); j5,vSh~q;'  
  UCHAR cKey; 86s.qPB0  
  UCHAR cMask; GJLlMi  
  void DeleteIcon(); $LLy#h?V]  
  void AddIcon(); ~ cKmf]  
  UINT nCount; 5 ,0fL  
  void SaveBmp(); (qDu|S3P  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^b{w\HZ  
  // Dialog Data >&|C E2'  
  //{{AFX_DATA(CCaptureDlg) Hq{i-z+  
  enum { IDD = IDD_CAPTURE_DIALOG }; oCBZ9PGkK  
  CComboBox m_Key; 8u,f<XHi"a  
  BOOL m_bControl; #)aUKFX  
  BOOL m_bAlt; ^MyuD?va  
  BOOL m_bShift; GgoPwl#{  
  CString m_Path; 3aL8 gE  
  CString m_Number; p*T`fOL  
  //}}AFX_DATA W?5u O  
  // ClassWizard generated virtual function overrides rpk )i:k\  
  //{{AFX_VIRTUAL(CCaptureDlg) #PzRhanX  
 public: ,qS-T'[v,(  
  virtual BOOL PreTranslateMessage(MSG* pMsg); H]LH~l  
 protected: HQ8oOn  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JsfX&dX0  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Pd99vq/  
  //}}AFX_VIRTUAL U*.Wx0QM  
  // Implementation 6dG:3n}  
 protected: v-;j44sB  
  HICON m_hIcon; e12.suv  
  // Generated message map functions wic& $p/%  
  //{{AFX_MSG(CCaptureDlg) ]-Z="YPY  
  virtual BOOL OnInitDialog(); a9CY,+ z5B  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); c~B[ <.Qj  
  afx_msg void OnPaint(); iRo/~(  
  afx_msg HCURSOR OnQueryDragIcon(); iWbrX1 I+  
  virtual void OnCancel(); l-Hp^|3Wq  
  afx_msg void OnAbout(); 'N?,UtG R  
  afx_msg void OnBrowse(); ^-, aB  
  afx_msg void OnChange(); N`FgjnQ`  
 //}}AFX_MSG 481SDG[b  
 DECLARE_MESSAGE_MAP() #{]X<et  
}; /8\gT(@  
#endif A4lh`n5%  
uqaP\  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >[]@Df,p  
#include "stdafx.h" ;naD`([  
#include "Capture.h" :wn9bCom?M  
#include "CaptureDlg.h" $F|3VQ~  
#include <windowsx.h> P8l x\DA  
#pragma comment(lib,"hook.lib") czMThm  
#ifdef _DEBUG lkNaSz[  
#define new DEBUG_NEW J?d&+mt  
#undef THIS_FILE 2f'3Vjp~G  
static char THIS_FILE[] = __FILE__; P4x Q:$2!  
#endif o1x IGP<  
#define IDM_SHELL WM_USER+1 ^l}Esz`-M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cO9aT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z5lE*z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =Ri'Pr x&  
class CAboutDlg : public CDialog a}~Xns  
{ D^+#RR'#,  
 public: ^oNk}:>  
  CAboutDlg(); DYS|"tSk  
  // Dialog Data mJBvhK9%  
  //{{AFX_DATA(CAboutDlg) *=OU~68)C  
  enum { IDD = IDD_ABOUTBOX }; 8!a6)Zeux  
  //}}AFX_DATA <ob+Ano$  
  // ClassWizard generated virtual function overrides 8cqH0{  
  //{{AFX_VIRTUAL(CAboutDlg) qJY'"_Q{  
 protected: MdzG2uZT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X2avo|6e  
  //}}AFX_VIRTUAL ~&>|u5C*@  
  // Implementation PP\nR @  
 protected: :JBvCyj4PE  
  //{{AFX_MSG(CAboutDlg) wYxnKm~f  
  //}}AFX_MSG 'Xl[ y  
  DECLARE_MESSAGE_MAP() >heFdKq1  
}; 9$-V/7@)  
9cJzL"yi  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?nWK s  
{ {fi:]|<1h  
 //{{AFX_DATA_INIT(CAboutDlg) vA(V.s`  
 //}}AFX_DATA_INIT ![ & go  
} qPJU}(9#B  
GEr]zMYG[A  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) dA;f`Bi;Q  
{ J|k~e,C  
 CDialog::DoDataExchange(pDX); Im9^mVe  
 //{{AFX_DATA_MAP(CAboutDlg) &. sfu$]  
 //}}AFX_DATA_MAP [I*BEJ;W'  
} nl9G1Sm(E  
X@$x(Zc  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?eUhHKS5  
 //{{AFX_MSG_MAP(CAboutDlg) :Oz! M&Ov  
 // No message handlers FKU$HQw*  
 //}}AFX_MSG_MAP -5 -X[`cF  
END_MESSAGE_MAP() >L6V!  
1b)^5U ;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) &5fM8 Opkd  
: CDialog(CCaptureDlg::IDD, pParent) >_ji`/ d{  
{ 16q"A$  
 //{{AFX_DATA_INIT(CCaptureDlg) e<_p\LiOS  
  m_bControl = FALSE; :G#>):  
  m_bAlt = FALSE; /aa'ryl_%  
  m_bShift = FALSE; p9*#{~   
  m_Path = _T("c:\\"); !(=bH"P  
  m_Number = _T("0 picture captured."); 0) }bJ,5/  
  nCount=0; s_} 1J,Y  
  bRegistered=FALSE; ]ee%=+'  
  bTray=FALSE; a =LjFpv/]  
 //}}AFX_DATA_INIT xviz{M9g  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 i*`;/x'+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Xz`?b4i  
} +R}(t{b#  
rf.w}B;V;  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) SooSOOAx[  
{ :( A5 ,$  
 CDialog::DoDataExchange(pDX); {5}UP@h  
 //{{AFX_DATA_MAP(CCaptureDlg) `.PZx%=  
  DDX_Control(pDX, IDC_KEY, m_Key); 9N^&~O|1  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); K9Dxb  
  DDX_Check(pDX, IDC_ALT, m_bAlt); a%Ky;ys  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); KL]@y!QU  
  DDX_Text(pDX, IDC_PATH, m_Path); Bor_Kib  
  DDX_Text(pDX, IDC_NUMBER, m_Number); "7_6iB&@<  
 //}}AFX_DATA_MAP {Z<4  
} J[fjl 6p  
"i$Av m  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) oy90|.]G  
//{{AFX_MSG_MAP(CCaptureDlg) mVGQyX  
 ON_WM_SYSCOMMAND() pNFL;k+p}  
 ON_WM_PAINT() F-%wOn /  
 ON_WM_QUERYDRAGICON() z38&7+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) o$I% 1  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^S*~<0NQ'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) :Mr_/t2(  
//}}AFX_MSG_MAP &mj98  
END_MESSAGE_MAP() 9W$FX  
wJA`e)>  
BOOL CCaptureDlg::OnInitDialog() TqK`X#Zq  
{ ks=j v:  
 CDialog::OnInitDialog(); B5"(NJ;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xMI4*4y(  
 ASSERT(IDM_ABOUTBOX < 0xF000); @K`2y'#b  
 CMenu* pSysMenu = GetSystemMenu(FALSE); C Sx V^  
 if (pSysMenu != NULL) o ohgZ&k2]  
 { H)S&sx#q]  
  CString strAboutMenu; Y9fktg.  
  strAboutMenu.LoadString(IDS_ABOUTBOX); r(./00a  
  if (!strAboutMenu.IsEmpty()) 7a.$tT  
  { g+h)s!$sB  
   pSysMenu->AppendMenu(MF_SEPARATOR); !P7&{I,e  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); e W&;r&26  
  } -d? 9Acd  
 } w[@>k@=  
 SetIcon(m_hIcon, TRUE); // Set big icon [xiZkV([  
 SetIcon(m_hIcon, FALSE); // Set small icon 24Lo .  
 m_Key.SetCurSel(0); \"BoTi'2!  
 RegisterHotkey(); y\&GPr  
 CMenu* pMenu=GetSystemMenu(FALSE); G v(bD6Rz  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); mB &nN+MV  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); jO\29(_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); @D_=M tF<  
 return TRUE; // return TRUE unless you set the focus to a control vKYdYa\  
} Onoi^MDy  
N|pjGgI  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,Oojh;P_  
{ W,~s0a!  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ],vUW#6$N  
 { N=hr%{} c  
  CAboutDlg dlgAbout; FT'_{e!M  
  dlgAbout.DoModal(); e6n1/TtqM  
 } J9J[.6k8  
 else ro{q':Z3  
 { ??tyz4$;  
  CDialog::OnSysCommand(nID, lParam); ~7aBli=  
 } csZIBi  
}  hM   
')_Gm{A#p  
void CCaptureDlg::OnPaint() m[S6pqz  
{ /5M@>A^?'  
 if (IsIconic()) '~i;g.n=}-  
 { ud xLHs  
  CPaintDC dc(this); // device context for painting W70J2  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zh7#[#>t  
  // Center icon in client rectangle {6Tw+/`P  
  int cxIcon = GetSystemMetrics(SM_CXICON); }}Ah-QU  
  int cyIcon = GetSystemMetrics(SM_CYICON); nnLE dJ}n  
  CRect rect; ~@=:I  
  GetClientRect(&rect); [OJ@{{U%  
  int x = (rect.Width() - cxIcon + 1) / 2; g0t$1cUR  
  int y = (rect.Height() - cyIcon + 1) / 2; is&A_C7yg  
  // Draw the icon z7V74hRPX  
  dc.DrawIcon(x, y, m_hIcon); QW :-q(s  
 } cF{5[?wS  
 else aH<BqD[#  
 { 6b+\2-eq  
  CDialog::OnPaint(); cQEK>aAd  
 } b}'XDw   
} kOR5'rh  
:@KU_U)\  
HCURSOR CCaptureDlg::OnQueryDragIcon() J \U}U'qP  
{ |__\Vn  
 return (HCURSOR) m_hIcon; e|Iylv[3  
} yv| |:wZC  
VyK]:n<5Q  
void CCaptureDlg::OnCancel() qH'T~# S  
{ _U)BOE0o  
 if(bTray) g+BW~e)  
  DeleteIcon(); ]0P-?O:  
  CDialog::OnCancel(); vwQY_J8  
} u )+;(Vd  
@f442@_4  
void CCaptureDlg::OnAbout() g/ONr,l`-  
{ m=i8o `  
 CAboutDlg dlg; aW hhq@  
 dlg.DoModal(); !7ct=L  
} N@J "~9T  
2ILMf?}  
void CCaptureDlg::OnBrowse() H@0i}!U64  
{ B$A`-  
 CString str; O o9 ePw7  
 BROWSEINFO bi; qPsf`nI7  
 char name[MAX_PATH]; 7z!|sPW](b  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); E/x``,k  
 bi.hwndOwner=GetSafeHwnd(); )70-q yA  
 bi.pszDisplayName=name; uP bvN[~t  
 bi.lpszTitle="Select folder"; tqyR~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  B[jCe5!w  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); *BzqAi0  
 if(idl==NULL) 9:zW$Gt&  
  return; 3]DUUXg$  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +O P8U]~  
 str.ReleaseBuffer(); Dd8*1,  
 m_Path=str; } MBxfZ4I  
 if(str.GetAt(str.GetLength()-1)!='\\') ; V)pXLE  
  m_Path+="\\"; 7Pspx'u  
 UpdateData(FALSE); !-1UJqO  
} gj{2" tE  
7+wy`xi  
void CCaptureDlg::SaveBmp() C5mq@$6  
{ {xb8H  
 CDC dc; qP? V{N  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); \k\ {S2SU  
 CBitmap bm; F|\^O[#R  
 int Width=GetSystemMetrics(SM_CXSCREEN); nxH+XHv  
 int Height=GetSystemMetrics(SM_CYSCREEN); KSsv~!3Yf  
 bm.CreateCompatibleBitmap(&dc,Width,Height); -_&"Q4FR;+  
 CDC tdc; |r2 U4 ^  
 tdc.CreateCompatibleDC(&dc);  ,r\  
 CBitmap*pOld=tdc.SelectObject(&bm); AA[(rw  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); J8Bz|.@Q  
 tdc.SelectObject(pOld); Ax &Z=  
 BITMAP btm; i> Wsc?  
 bm.GetBitmap(&btm); x { Z_rD  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; B3 fKb#T  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); fLM5L_S}Y  
 BITMAPINFOHEADER bih; +[386  
 bih.biBitCount=btm.bmBitsPixel; Ni]V)wGE;  
 bih.biClrImportant=0; tQz=_;jy  
 bih.biClrUsed=0; NN(ZH73  
 bih.biCompression=0; m$b5Vqq  
 bih.biHeight=btm.bmHeight; XV)<Oavs  
 bih.biPlanes=1; ;MH((M/AN  
 bih.biSize=sizeof(BITMAPINFOHEADER); }6zo1"  
 bih.biSizeImage=size; wuRB[KLe  
 bih.biWidth=btm.bmWidth; !EO*xxQ  
 bih.biXPelsPerMeter=0; 39 D!e&  
 bih.biYPelsPerMeter=0; PuyJ:#a  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 37C'knW  
 static int filecount=0; 5]_m\zn=  
 CString name; z4 GcS/3K  
 name.Format("pict%04d.bmp",filecount++); kg0X2^#b  
 name=m_Path+name; [ 6+iR  
 BITMAPFILEHEADER bfh; xi5G?r  
 bfh.bfReserved1=bfh.bfReserved2=0; C(N' +VV_  
 bfh.bfType=((WORD)('M'<< 8)|'B'); er<yB#/;-  
 bfh.bfSize=54+size; ^y" #2Ov  
 bfh.bfOffBits=54; i_/A,5TF  
 CFile bf; 3y#0Lb-y  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ eBUexxBY  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); M8_f{|!&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }STTDq4  
  bf.WriteHuge(lpData,size); $7J9Yzp?L  
  bf.Close(); uJxT)m!/  
  nCount++; 0v7#vZ  
 } zG IxmJ.  
 GlobalFreePtr(lpData); Z5x&P_.x[  
 if(nCount==1) V\1pn7~V  
  m_Number.Format("%d picture captured.",nCount); @aQ};~  
 else }%^N9AA8  
  m_Number.Format("%d pictures captured.",nCount); V47z;oMXct  
  UpdateData(FALSE); &TgS$c5k  
} 7'IcgTWDZy  
g&E3Wc  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) asEk 3  
{ /RG>n  
 if(pMsg -> message == WM_KEYDOWN) =6.4  
 { (5rfeSA^  
  if(pMsg -> wParam == VK_ESCAPE) \&!qw[;O  
   return TRUE; -uk}Fou  
  if(pMsg -> wParam == VK_RETURN) $O'IbA  
   return TRUE; zf4\V F  
 } #gq!L  
 return CDialog::PreTranslateMessage(pMsg); 5%r:hO @S  
} $@Bd}35 J  
\&8 61A;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0jJ:WPR  
{ l('@~-Zy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W1;QPdz:  
  SaveBmp(); qr@ <'wp/  
  return FALSE; #ET y#jKL  
} V|3^H^\5P  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `=Z3X(Kc  
 CMenu pop; 7Gwo:s L  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;T\+TZtI  
 CMenu*pMenu=pop.GetSubMenu(0); Q\W?qB_  
 pMenu->SetDefaultItem(ID_EXITICON); ''Y'ZsQ;  
 CPoint pt; (=-6'23q)  
 GetCursorPos(&pt); iJU=98q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); yM2}J s C  
 if(id==ID_EXITICON) # 4&t09  
  DeleteIcon(); \1ncr4  
 else if(id==ID_EXIT) gyz_$T@x  
  OnCancel(); dW5@Z-9  
 return FALSE; 0-Ga2Go9  
} -=W Qed}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); @|PUet_pb  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) E[ttamU  
 AddIcon(); O=5q<7PM.  
 return res; *x-@}WY$U  
} a=4 `C*)  
B,fVNpqo  
void CCaptureDlg::AddIcon() 3y%,f|ju  
{ Kw7uUJR  
 NOTIFYICONDATA data; #LR.1zZ  
 data.cbSize=sizeof(NOTIFYICONDATA); w9w=2 *  
 CString tip; xj[v$HP  
 tip.LoadString(IDS_ICONTIP); P84= .* >  
 data.hIcon=GetIcon(0); U4N H9-U'  
 data.hWnd=GetSafeHwnd(); wEF"'T  
 strcpy(data.szTip,tip); Ye|(5f  
 data.uCallbackMessage=IDM_SHELL; "Q`Le{  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f>iDq C4  
 data.uID=98; f hjlt#  
 Shell_NotifyIcon(NIM_ADD,&data); MCAWn H  
 ShowWindow(SW_HIDE); PjP6^"  
 bTray=TRUE; w\RYxu?  
} H0f]Swh0a  
)UtK9;@"  
void CCaptureDlg::DeleteIcon() 5\Rg%Ezl  
{ 7_R[ =t  
 NOTIFYICONDATA data; R"y xpw  
 data.cbSize=sizeof(NOTIFYICONDATA); P(.XB`  
 data.hWnd=GetSafeHwnd(); Zb7%$1)L~  
 data.uID=98; +NJIi@  
 Shell_NotifyIcon(NIM_DELETE,&data); =$y;0]7Lwi  
 ShowWindow(SW_SHOW); G{!(2D4!  
 SetForegroundWindow(); +K s3  
 ShowWindow(SW_SHOWNORMAL); YwS/O N  
 bTray=FALSE; n?>|2>  
} AyNpY_B0c  
3+\Zom4  
void CCaptureDlg::OnChange() rd;E /:`5  
{ <KJ|U0/jGd  
 RegisterHotkey(); -zUBK  
} Y>T<Qn^D  
3 Q~0b+k  
BOOL CCaptureDlg::RegisterHotkey() rp4{lHw>C/  
{ B@@tKn_CQ  
 UpdateData(); voFg6zoV_  
 UCHAR mask=0; bk1.H@8  
 UCHAR key=0;  9I:3  
 if(m_bControl) k(M"k!M  
  mask|=4; njaKU?6%d2  
 if(m_bAlt) MJ$.ST  
  mask|=2; +^jm_+  
 if(m_bShift) .mNw^>:cq  
  mask|=1; `Hq*l"8  
  key=Key_Table[m_Key.GetCurSel()]; <(_Tanx9Q  
 if(bRegistered){ cE>m/^SKr  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); v0TbQ  
  bRegistered=FALSE; ,:#h;4!VRF  
 } 4 aE{}jp1  
 cMask=mask; F vTswM>  
 cKey=key; z7z9lDS  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); As5-@l`@  
 return bRegistered; vL;>A]oM2  
} t%O)Ti  
ZNl1e'  
  四、小结 AyW=.  
*VH Wvj  
  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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