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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: ?TuI:dC  
  d]M[C[TOX  
  一、实现方法  ]R Mb,hJ  
%N~;{!![p  
  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: "oE*9J?e  
K ~>jApZ%  
#pragma data_seg("shareddata") ~5t?C<wo  
HHOOK hHook =NULL; //钩子句柄 xtJAMo>g  
UINT nHookCount =0; //挂接的程序数目 7>x;B  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 A'DVJ9%xB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 bc}dYK3$q  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @ u1Q-:  
static int KeyCount =0; J#7(]!;F  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -fux2?8M  
#pragma data_seg() dokuyiN\  
cjg=nTsBA  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 dp^N_9$cdO  
v"k 4ATWP  
  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: AA7#c7  
yzc pG6 ,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1!s28C5u  
cKey,UCHAR cMask) &`PbO  
{ j+1KNH  
 BOOL bAdded=FALSE; YkbO&~.  
 for(int index=0;index<MAX_KEY;index++){ L<@&nx   
  if(hCallWnd[index]==0){ $'$>UFR  
   hCallWnd[index]=hWnd; R|t;p!T  
   HotKey[index]=cKey; Bz]J=g7  
   HotKeyMask[index]=cMask; $GF&x>]]  
   bAdded=TRUE; @Qo,p  
   KeyCount++; A1<k1[5fJ  
   break; MYTS3(  
  } #'NY}6cb$  
 } KF$%q((  
 return bAdded; Cj$H[K}>  
} d[U1.SNL  
//删除热键 tQ0=p| T]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]hUKuef  
{ y#r\b6  
 BOOL bRemoved=FALSE; 6{^*JC5nj  
 for(int index=0;index<MAX_KEY;index++){ 3o7xN=N  
  if(hCallWnd[index]==hWnd){ B&nw#saz.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ AijUs*n 2  
    hCallWnd[index]=NULL; :bw6k  
    HotKey[index]=0; 3"B+xbe=  
    HotKeyMask[index]=0; 4sd-zl$Of  
    bRemoved=TRUE; U$$3'n  
    KeyCount--; O<a3DyUa;  
    break; U]j&cFbn5_  
   } R1 qMg+  
  } AJWLEc4XK  
 } Vw?P.4  
 return bRemoved; 36i_D6  
} ]n1D1  
y<uE-4  
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  DLL中的钩子函数如下: J=L`]XE  
GG>Y/;^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ./)j5M  
{ J/gQQ. s  
 BOOL bProcessed=FALSE; 1Q_ ``.M  
 if(HC_ACTION==nCode) &U0WkW   
 {  /Ef4EX0  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ZE ^u.>5  
   switch(wParam) dAwS<5!  
   {  eu=|t&FKk  
    case VK_MENU: q"p#H8  
     MaskBits&=~ALTBIT; g$gVm:=  
     break; V*kznm  
    case VK_CONTROL: j%Gbg J  
     MaskBits&=~CTRLBIT; {"\q(R0  
     break; 2q|_Dma  
    case VK_SHIFT: _"v~"k 90^  
     MaskBits&=~SHIFTBIT; 4Qhx[Hv>(  
     break; aZC*7AK   
    default: //judge the key and send message T/5nu?v  
     break; *<CxFy;|  
   } Obg@YIwn  
   for(int index=0;index<MAX_KEY;index++){ }*OD M6  
    if(hCallWnd[index]==NULL) Z c<]^QR  
     continue; eAU"fu6d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "j +v,js  
    { Q+/R JM?3@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =G[ H,;W  
     bProcessed=TRUE; 1 S^'C2/b  
    } ,^M]yr*~  
   } NB3/A"}"02  
  } `lvh\[3^  
  else if((lParam&0xc000ffff)==1){ //有键按下 s V&`0N  
   switch(wParam) &(WE]ziuO  
   { ~"RQ!&U  
    case VK_MENU: qY# m*R  
     MaskBits|=ALTBIT; R$ v i!0  
     break; _=)!xnYf  
    case VK_CONTROL: ;,FT&|3o  
     MaskBits|=CTRLBIT; 7:ckq(89  
     break; v7g [Lk  
    case VK_SHIFT: I_K[!4~Kn  
     MaskBits|=SHIFTBIT; fyGCfM  
     break; t0+t9w/fTP  
    default: //judge the key and send message @],Z 2  
     break; `2sdZ/fO  
   } .k p $oAL  
   for(int index=0;index<MAX_KEY;index++){ '>"`)-  
    if(hCallWnd[index]==NULL) kaV%0Of]  
     continue; AK %=DVkM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R+k=Ea&x  
    { x ru(Le}E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d!w1t=2H  
     bProcessed=TRUE; 0%#t[us Y  
    } ?i/73H+;D3  
   } 5wy;8a  
  } fHW-Je7mG  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ![qRoYpbg8  
   for(int index=0;index<MAX_KEY;index++){ fdg[{T4:  
    if(hCallWnd[index]==NULL) XlE$.  
     continue; nz}]C04:-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J: L-15  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); l85O-g}M  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 mMn2(  
   } bbM4A! N  
  } gt#MeU  
 } Cq TH!'N  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); D[+|^,^>  
} |>M-+@g j  
UU*0dSWr  
  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: tbL1g{Dz,  
ks)fQFSbu  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LqMe'z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7 _X&5ni  
5ENov!$H  
  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+BrTGp  
C+}CU}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9)1P+c--  
{ Bb$S^F(Xq  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Y}85J:q]  
 { W^-hMT]uD  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 hQ\#Fhu7  
  SaveBmp();  ]v/t8`  
  return FALSE; 39'X$!  
 } 7)g;Wd+H  
 …… //其它处理及默认处理 "4J?JR  
} wOD/Z8  
oiIt3<BX  
-i| /JH  
  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。 g-4gI\  
+#&el//  
  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。 O@G<B8U,K  
1uKD&k%q  
  二、编程步骤 >\N$>"~a  
wY."Lw> 6  
  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"; Ubn   
@G^j8Nl+J}  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :YkDn~@  
Y j ,9V],  
  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; &Z;Eu'ia  
5%vP~vy_}  
  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; sE(X:[Am  
yQ72v'  
  5、 添加代码,编译运行程序。 D'U\]'.  
+H5 jRw  
三、程序代码 \JF57t}Zk  
nS?S6G5h  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL m-Mhf;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) PX+"" #  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ p\4h$."  
#if _MSC_VER > 1000 Br_3qJNVP  
#pragma once 2b{@]Fp  
#endif // _MSC_VER > 1000 bQ${8ZO  
#ifndef __AFXWIN_H__ Udb0&Y1^  
#error include 'stdafx.h' before including this file for PCH gDUoc*+h  
#endif J tn&o"C  
#include "resource.h" // main symbols o(S^1j5  
class CHookApp : public CWinApp ee__3>H"/  
{ rd f85%%7  
 public: s.k`];wo  
  CHookApp(); _rWTw+ L  
  // Overrides x`j_d:C~G  
  // ClassWizard generated virtual function overrides AmUe0CQ:k'  
  //{{AFX_VIRTUAL(CHookApp) K6 PC&+x  
 public: 8trm`?>  
  virtual BOOL InitInstance(); bCe[nmE2  
  virtual int ExitInstance(); \oD=X}UQw(  
  //}}AFX_VIRTUAL x3:ZB  
  //{{AFX_MSG(CHookApp) z{<q0.^EFh  
  // NOTE - the ClassWizard will add and remove member functions here. Lx4H/[$6D  
  // DO NOT EDIT what you see in these blocks of generated code ! :$)aMEq  
  //}}AFX_MSG o =jX  
  DECLARE_MESSAGE_MAP() 2=/-d$  
}; zmrX %!CW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); M[&.kH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HzFt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ul]m>W  
BOOL InitHotkey(); $)WH^Ir~  
BOOL UnInit(); 1{Sx V  
#endif d@`-!"  
qrORP3D@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. <3J=;.\6  
#include "stdafx.h" d- _93  
#include "hook.h" kG~ivB}x  
#include <windowsx.h> rK0|9^i{  
#ifdef _DEBUG J}93u(T5  
#define new DEBUG_NEW Jf8'N ot  
#undef THIS_FILE &El[  
static char THIS_FILE[] = __FILE__; u8$~N$L  
#endif PhI{3B/  
#define MAX_KEY 100 .*clY  
#define CTRLBIT 0x04 42H#n]Y  
#define ALTBIT 0x02 N-_| %C-.  
#define SHIFTBIT 0x01 pB{ f-M:D  
#pragma data_seg("shareddata") b_"V%<I  
HHOOK hHook =NULL; hyr5D9d  
UINT nHookCount =0; bx'B;rZr  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey LXOF{FG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT +eVpMD( l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 3mnLV*aRt  
static int KeyCount =0; J>&dWKM3  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ~>wq;T:=  
#pragma data_seg() +O%a:d%  
HINSTANCE hins; 'j =PbA  
void VerifyWindow(); 4'u|L&ow  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 0v,`P4_k  
//{{AFX_MSG_MAP(CHookApp) YH:W]  
// NOTE - the ClassWizard will add and remove mapping macros here. r>D[5B  
// DO NOT EDIT what you see in these blocks of generated code! !{|yAt9kP  
//}}AFX_MSG_MAP x,@O:e  
END_MESSAGE_MAP() %.r5E2'  
DrYoC7   
CHookApp::CHookApp() kk>0XPk  
{ ".7 KEnx  
 // TODO: add construction code here, sC'A_-'  
 // Place all significant initialization in InitInstance ,YuWz$aF{  
} +HVG5l  
wNlV_  
CHookApp theApp; 'e8d["N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @a{v>)  
{ E].a|4sh  
 BOOL bProcessed=FALSE; IcNIuv  
 if(HC_ACTION==nCode) l.LFlwt  
 { !&:.Uh  
  if((lParam&0xc0000000)==0xc0000000){// Key up A'P}mrY  
   switch(wParam) R,k[Kh  
   { ~S<F  
    case VK_MENU: e?'k[ES^  
     MaskBits&=~ALTBIT; . LVOaxT  
     break; -2m Ogv  
    case VK_CONTROL: F$pd]F!#  
     MaskBits&=~CTRLBIT; & m ";D  
     break; -O,O<tOm  
    case VK_SHIFT: P#'DGW&W0  
     MaskBits&=~SHIFTBIT; \6PIw-)  
     break; g\mrRZ/?  
    default: //judge the key and send message SGT-B.  
     break; "}Sid+)<  
   } f0s<Y  
   for(int index=0;index<MAX_KEY;index++){ gB'Ah-@,P  
    if(hCallWnd[index]==NULL) OA5md9P;d  
     continue; T;vPR,]rz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QRc=-Wu_(  
    { ' c\TMb.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p9bxhnn|  
     bProcessed=TRUE; "7u"d4h-:(  
    } jMN@x]6w  
   } n"VE!`B  
  } !wufoK  
  else if((lParam&0xc000ffff)==1){ //Key down ~$`YzK^*X  
   switch(wParam) t7`Pw33#kY  
   {  /o3FK  
    case VK_MENU: T<~[vjA  
     MaskBits|=ALTBIT; 5~TA(cb5  
     break; "I 1M$^8n  
    case VK_CONTROL: _1bd)L&dF  
     MaskBits|=CTRLBIT; a5g{.:NfO  
     break; C=f(NpyD6  
    case VK_SHIFT: ,lGwW8$R  
     MaskBits|=SHIFTBIT; pt;Sk?-1  
     break; 0BZOr-i  
    default: //judge the key and send message ~.=!5Ry  
     break; 4BL,/(W] x  
   } 9w<_XXQ  
   for(int index=0;index<MAX_KEY;index++) +as\>"Cj+2  
   { ~8 a>D<b  
    if(hCallWnd[index]==NULL) PX{~!j%n  
     continue; RJm8K,3#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /hy!8c7  
    { dD2e"OIX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); dK`O,[}  
     bProcessed=TRUE; ?26[%%  
    } 3cQmxp2*  
   } EJ|ZZYke!  
  } !ZcA Ltq  
  if(!bProcessed){ Ji?UG@  
   for(int index=0;index<MAX_KEY;index++){ 4o8HEq!  
    if(hCallWnd[index]==NULL) M L_J<|,J  
     continue; ;SP3nU))  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZQ8Aak  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Y2$`o4*3  
   } 5rSth.&  
  } aWK7 -n  
 } \crmNH)3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \O4=mJ  
} s,q!(\{Pv  
R^C;D 2  
BOOL InitHotkey() 8+b3u05  
{ r_CN/a  
 if(hHook!=NULL){ v~=ol8J B  
  nHookCount++; 87*[o  
  return TRUE; `Wt~6D e  
 } Z ' 96d  
 else Q%h o[KU  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); /{} ]Hu  
  if(hHook!=NULL) I!#^F 1p1  
   nHookCount++; [vT,zM  
  return (hHook!=NULL); Wm/k(R`O<  
} =!Cvu.~},  
BOOL UnInit() ]8z6gDp  
{ 'vClZGQ1  
 if(nHookCount>1){ mTbPz Z4  
  nHookCount--; LKG|S<s  
  return TRUE; YZJP7nN  
 } RH0a\RC!G  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +N!{(R:"v}  
 if(unhooked==TRUE){ yXmp]9$  
  nHookCount=0; %'< qhGJ  
  hHook=NULL; PQay sdb  
 } +u.L6GcB  
 return unhooked; f%l#g]]  
} : s3Vl  
9e6{(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0w&1wee(  
{ >U.uRq  
 BOOL bAdded=FALSE; 8#AXK{  
 for(int index=0;index<MAX_KEY;index++){ PUo&>  
  if(hCallWnd[index]==0){ . 2Q/D?a  
   hCallWnd[index]=hWnd; 7K4%`O  
   HotKey[index]=cKey; hY'%SV p  
   HotKeyMask[index]=cMask; _P+|tW1  
   bAdded=TRUE; a}{! %5  
   KeyCount++; 9(]j e4Cn  
   break; P;[mw(  
  } 4h(Hy&1C  
 } hQeZI+  
 return bAdded; ?uv%E*TU  
} 2%H( a)  
#$QY[rf=6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ttRH[[E(  
{ zW.sXV,  
 BOOL bRemoved=FALSE; CAO{$<M5m  
 for(int index=0;index<MAX_KEY;index++){ MQu6Tm H  
  if(hCallWnd[index]==hWnd){ vnpX-c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,B!Qv3bn  
    hCallWnd[index]=NULL; Ss}0.5Bq  
    HotKey[index]=0; ^5F/=TtE G  
    HotKeyMask[index]=0; i>}z$'X  
    bRemoved=TRUE; e2F7G>q:5  
    KeyCount--; sP!qv"u  
    break; mer{Jy s  
   } Rl8-a8j$f.  
  } W,+91rup  
 } Q0q$ZK6C  
 return bRemoved; 0:p#%Nvg  
} n!nv.-n  
} U.B$4Q  
void VerifyWindow() L1BpY-=  
{ 'z:p8"h}  
 for(int i=0;i<MAX_KEY;i++){ b.+\qaR  
  if(hCallWnd!=NULL){ .(ir2g  
   if(!IsWindow(hCallWnd)){ mYvm_t9  
    hCallWnd=NULL; <hdCO< 0(  
    HotKey=0; `$HO`d@0*R  
    HotKeyMask=0; <NO~TBHF  
    KeyCount--; /;1FZ<zU  
   } /0(KKZ)  
  } RB!E>]   
 } nm.d.A/]Z  
} %{"STbO#>  
}vIm C [  
BOOL CHookApp::InitInstance() .}wir,  
{ !NtY4O/  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Y'9deX+  
 hins=AfxGetInstanceHandle(); \8ZNXCP  
 InitHotkey(); g(^l>niF:  
 return CWinApp::InitInstance(); =\.|'  
} w8Yff[o  
|Sq>uC)  
int CHookApp::ExitInstance() $G[##j2  
{ b :00w["  
 VerifyWindow(); JZ [&:  
 UnInit(); L`v,:#Y   
 return CWinApp::ExitInstance(); 98"NUT  
} QkbN2mFv%  
4j5 "{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @ Ia ~9yOY  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 2_C.-;!  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ +Gko[<  
#if _MSC_VER > 1000 4(]k=c1<  
#pragma once @U5o;X!qU  
#endif // _MSC_VER > 1000 &[uGfm+@  
=v-D}eJQ=  
class CCaptureDlg : public CDialog q6dq@   
{ S6 *dp68  
 // Construction .67W\p  
 public: >8so'7(  
  BOOL bTray; YuZnuI@m9  
  BOOL bRegistered; ]M/w];:  
  BOOL RegisterHotkey(); ]Az >W*Y  
  UCHAR cKey; QG.FW;/L,  
  UCHAR cMask; HO>uS>+  
  void DeleteIcon(); !*;)]j  
  void AddIcon(); AF !_! qc;  
  UINT nCount; 5h&8!!$[  
  void SaveBmp(); ;A_QI>>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor z; +x`i.  
  // Dialog Data smggr{-  
  //{{AFX_DATA(CCaptureDlg) &x3y.}1  
  enum { IDD = IDD_CAPTURE_DIALOG }; x8[8z^BV?e  
  CComboBox m_Key; pH%K4bV)8  
  BOOL m_bControl; |NqQKot1  
  BOOL m_bAlt; lz>hP  
  BOOL m_bShift; "F&uk~ b$  
  CString m_Path; 827N?pU$)  
  CString m_Number; |8"HTBb\CW  
  //}}AFX_DATA ofJ@\xS  
  // ClassWizard generated virtual function overrides J7H1<\=cJb  
  //{{AFX_VIRTUAL(CCaptureDlg) 4{V=X3,x  
 public:  6O}r4*  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9ccEF6o0=  
 protected: VCIG+Gz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DIY WFVh  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); YG_3@`-<  
  //}}AFX_VIRTUAL 4s~o   
  // Implementation 01J.XfCd6  
 protected: H:`r!5&Qb5  
  HICON m_hIcon; V>hy5hDpH  
  // Generated message map functions BmZd,}{  
  //{{AFX_MSG(CCaptureDlg) <M=K!k  
  virtual BOOL OnInitDialog(); $d'Gh2IGA  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); rv+"=g  
  afx_msg void OnPaint(); Z`D#L[z$  
  afx_msg HCURSOR OnQueryDragIcon(); PQ j_j#0  
  virtual void OnCancel(); \K=Jd#9c  
  afx_msg void OnAbout(); *k/_p ^  
  afx_msg void OnBrowse(); jm!G@k6TA  
  afx_msg void OnChange(); W;1Hyk  
 //}}AFX_MSG vCJjZ%eO%D  
 DECLARE_MESSAGE_MAP() :mij%nQ>$  
}; j$,`EBf`:<  
#endif &wJ"9pQ~6E  
plca`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file p&7>G-.  
#include "stdafx.h" xk,E A U  
#include "Capture.h" MxYCMe4S[  
#include "CaptureDlg.h" qz 'a.]{=  
#include <windowsx.h> JSM{|HJxh  
#pragma comment(lib,"hook.lib") ^vzNs>eJ  
#ifdef _DEBUG W!{uEH{%l  
#define new DEBUG_NEW &{>~ |^  
#undef THIS_FILE /)|*Vzu  
static char THIS_FILE[] = __FILE__; GB0] |z5  
#endif [mhY_Hmz]  
#define IDM_SHELL WM_USER+1 oD.f/hi0|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Fw|5A"9'a'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); iS"rMgq  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; x ` $4  
class CAboutDlg : public CDialog [p(Y|~  
{ :)+cI?\#  
 public: Tsa&R:SE  
  CAboutDlg(); '+$2<Ys  
  // Dialog Data h5~tsd}OU  
  //{{AFX_DATA(CAboutDlg) W>Zce="_gN  
  enum { IDD = IDD_ABOUTBOX }; ?wmr~j  
  //}}AFX_DATA ]p~XTZgW  
  // ClassWizard generated virtual function overrides _vad>-=D*U  
  //{{AFX_VIRTUAL(CAboutDlg) P/27+5(|  
 protected: !=a8^CV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Es?~Dd  
  //}}AFX_VIRTUAL $]O\Ryf6  
  // Implementation @r#>-p  
 protected: &.d~ M1Mz  
  //{{AFX_MSG(CAboutDlg) aFLm,  
  //}}AFX_MSG JV@>dK8  
  DECLARE_MESSAGE_MAP() ce@(Ct  
}; -IPc;`<  
2rA`y8g(L  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 9khD7v   
{ hNQ,U{`;^  
 //{{AFX_DATA_INIT(CAboutDlg) ='~C$%  
 //}}AFX_DATA_INIT P",53R+"  
} EPyFM_k  
rK];2[U  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) u+hzCCwtR  
{ T\OLysc  
 CDialog::DoDataExchange(pDX); k+&|*!j  
 //{{AFX_DATA_MAP(CAboutDlg) %hY+%^k.  
 //}}AFX_DATA_MAP }lhJt|qc  
} /q8n_NR  
\OOj]gAe  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) eI- ~ +.  
 //{{AFX_MSG_MAP(CAboutDlg) $L?stgU  
 // No message handlers &DgIykqN  
 //}}AFX_MSG_MAP 't wMvm  
END_MESSAGE_MAP() WO]dWO6Mm  
m~# O ~)  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) zp d4uto5  
: CDialog(CCaptureDlg::IDD, pParent) A\WgtM  
{ gCd9"n-e  
 //{{AFX_DATA_INIT(CCaptureDlg) "}EydG"=  
  m_bControl = FALSE; *8Gx_$t&  
  m_bAlt = FALSE; d"$ \fL  
  m_bShift = FALSE; R:11w#m7w  
  m_Path = _T("c:\\"); HdVGkv/  
  m_Number = _T("0 picture captured."); * ,,D%L  
  nCount=0; I9_tD@s"(  
  bRegistered=FALSE; )PZ'{S  
  bTray=FALSE;  F`f#gpQ  
 //}}AFX_DATA_INIT &FGz53fd4  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7)~/`w)P  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); HdLVXaD/  
} Kx ';mgG#$  
|FH/Q-7[  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) an.)2*u  
{ je.mX/Lpj  
 CDialog::DoDataExchange(pDX); JIDE]f  
 //{{AFX_DATA_MAP(CCaptureDlg) +.{_n(kU  
  DDX_Control(pDX, IDC_KEY, m_Key); C%l~qf1n  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Rom|Bqo;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); }*;Hhbox  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); b bX2D/  
  DDX_Text(pDX, IDC_PATH, m_Path); B2VUH..am  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 6M F%$K3  
 //}}AFX_DATA_MAP tFXG4+$D  
} Ot5 $~o  
jPhOk>m  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9J*m!-hOY  
//{{AFX_MSG_MAP(CCaptureDlg) P$\( Bd\76  
 ON_WM_SYSCOMMAND() W%) foJ  
 ON_WM_PAINT() om|M=/^  
 ON_WM_QUERYDRAGICON() yjc:+Y{5'  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !\^c9Pg|v  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #|)GarDG  
 ON_BN_CLICKED(ID_CHANGE, OnChange) anHP5gD  
//}}AFX_MSG_MAP KD=T04v  
END_MESSAGE_MAP() tvZpm@1  
az\ ;D\\  
BOOL CCaptureDlg::OnInitDialog() V\^?V|  
{ 19h8p>Sx0  
 CDialog::OnInitDialog(); F(:+[$)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [[ H XOPaV  
 ASSERT(IDM_ABOUTBOX < 0xF000); )9==6p  
 CMenu* pSysMenu = GetSystemMenu(FALSE); DtR-NzjB  
 if (pSysMenu != NULL) pJ1GB  
 { uG~%/7Qt{  
  CString strAboutMenu; 'Q?nU^:F#  
  strAboutMenu.LoadString(IDS_ABOUTBOX); IKH#[jW'IB  
  if (!strAboutMenu.IsEmpty()) |v:8^C7  
  { d'J))-*#UO  
   pSysMenu->AppendMenu(MF_SEPARATOR); qVx0VR1:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8g^OXZ   
  } _"Y;E  
 } (WX,&`a<$  
 SetIcon(m_hIcon, TRUE); // Set big icon dyD =R  
 SetIcon(m_hIcon, FALSE); // Set small icon %#Fd0L  
 m_Key.SetCurSel(0); Y<I/y  
 RegisterHotkey(); t :sKvJ  
 CMenu* pMenu=GetSystemMenu(FALSE); hBO I:4u[  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &K|<7Efx  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); oe# :EfT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8 }nA8J  
 return TRUE; // return TRUE unless you set the focus to a control b> Iq k  
} fo^M`a!va0  
_ z#zF[%  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;VNwx(1l`  
{ W_ngB[  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 7{2knm^  
 { +3!um  
  CAboutDlg dlgAbout; `dx+Qp  
  dlgAbout.DoModal(); JO1KkIV  
 } :TxfkicN\  
 else U_y)p Cd  
 { :;#Kg_bz  
  CDialog::OnSysCommand(nID, lParam); L00,{g6wqb  
 } $*{PUj  
} 8!'#B^  
;a*i*{\Rm  
void CCaptureDlg::OnPaint() T1LtO O  
{ Q9]7.^l  
 if (IsIconic()) <G/O!02  
 { QB7E:g&7  
  CPaintDC dc(this); // device context for painting   9Ld3  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?x%HQ2`  
  // Center icon in client rectangle It!PP1$   
  int cxIcon = GetSystemMetrics(SM_CXICON); >x eKO 2o  
  int cyIcon = GetSystemMetrics(SM_CYICON); p3qlVE  
  CRect rect; 4hr;k0sD  
  GetClientRect(&rect); #swzZyM$  
  int x = (rect.Width() - cxIcon + 1) / 2; 3#j%F  
  int y = (rect.Height() - cyIcon + 1) / 2; .TSj8,  
  // Draw the icon n'U*8ID  
  dc.DrawIcon(x, y, m_hIcon); "9>~O`l,  
 } IF(W[J  
 else y}R{A6X)  
 {  +,gI|  
  CDialog::OnPaint(); b(&2/|hd  
 } s 'u6Ep/V  
} ^8a,gA8.  
(&=-o(  
HCURSOR CCaptureDlg::OnQueryDragIcon() SL? ! RQ  
{ [>=D9I@~  
 return (HCURSOR) m_hIcon; K, WNM S  
} 4w}\2&=  
cAogz/<S  
void CCaptureDlg::OnCancel() !-m (1  
{  S`)KC-  
 if(bTray) MMN2X xS  
  DeleteIcon(); bW7tJ  
  CDialog::OnCancel(); {+0]diD  
} ICN>8|O`&  
?54=TA|5`F  
void CCaptureDlg::OnAbout() s*>s;S?{|  
{ *!ZU" q}i  
 CAboutDlg dlg; T2AyQ~5~  
 dlg.DoModal(); P>+{}c}3I  
} y+)][Wa0  
3?|Fn8dQR.  
void CCaptureDlg::OnBrowse() T2P0(rEz  
{ ?Lbw o<E  
 CString str; bN`oQ.Z 4  
 BROWSEINFO bi; Zrr3='^s  
 char name[MAX_PATH]; mqrP0/sN  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Q.*qU,4);  
 bi.hwndOwner=GetSafeHwnd(); MRwls@z=  
 bi.pszDisplayName=name; <x,u!}5J  
 bi.lpszTitle="Select folder"; F42r]k  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @F]6[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Qx1ZxJz #  
 if(idl==NULL) cpF\^[D  
  return; '>^+_|2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));  ?}e8g  
 str.ReleaseBuffer(); [=z1~dXKb  
 m_Path=str; 9OuK}Ssf  
 if(str.GetAt(str.GetLength()-1)!='\\') KJo [!|.  
  m_Path+="\\"; AU)"L_ i}  
 UpdateData(FALSE); R] tHd=kf  
} N)K};yMf  
E ~<SEA  
void CCaptureDlg::SaveBmp()  oJ ~ZzW  
{ Kn SXygT  
 CDC dc; QXY-?0RO#  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); };o6|e:2E  
 CBitmap bm; *]nha1!S  
 int Width=GetSystemMetrics(SM_CXSCREEN); 7L|w~l7R~  
 int Height=GetSystemMetrics(SM_CYSCREEN); TG8QT\0G  
 bm.CreateCompatibleBitmap(&dc,Width,Height); UTGR{>=>  
 CDC tdc; IHZ WNT2  
 tdc.CreateCompatibleDC(&dc); 7Vr .&`l  
 CBitmap*pOld=tdc.SelectObject(&bm); G(~d1%(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); M=HW2xn  
 tdc.SelectObject(pOld); yv =LT~  
 BITMAP btm; DmEmv/N=  
 bm.GetBitmap(&btm); &W:Wv,3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; s-Q-1lKV,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); tSV}BM,  
 BITMAPINFOHEADER bih; 7h?PVobe  
 bih.biBitCount=btm.bmBitsPixel; TviC1 {2  
 bih.biClrImportant=0; @C62%fU{5  
 bih.biClrUsed=0; ywXerz7dUk  
 bih.biCompression=0; f50qA;7k  
 bih.biHeight=btm.bmHeight; =unMgX]$  
 bih.biPlanes=1; M7-piRnd4  
 bih.biSize=sizeof(BITMAPINFOHEADER); <"{Lv)4  
 bih.biSizeImage=size; aR6?+`6<  
 bih.biWidth=btm.bmWidth; O@{ JB  
 bih.biXPelsPerMeter=0; :0$(umW@I"  
 bih.biYPelsPerMeter=0; yw^t6E  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _v{,vLH  
 static int filecount=0; 6^F"np{w  
 CString name; RXh0hD  
 name.Format("pict%04d.bmp",filecount++); kbJ/7  
 name=m_Path+name; mq`N&ABO!K  
 BITMAPFILEHEADER bfh; @a#qq`b;  
 bfh.bfReserved1=bfh.bfReserved2=0; VQ5T$,&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); v|t_kNX;v*  
 bfh.bfSize=54+size; g e)g?IP4  
 bfh.bfOffBits=54; /Mb?dVwA  
 CFile bf; =B4U~|k  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {(]B{n  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); &&4av*\I  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zYO+;;*@  
  bf.WriteHuge(lpData,size); E]WammX c  
  bf.Close(); B;XFPQ#b  
  nCount++; x.qn$?3V]  
 } jv>l6)  
 GlobalFreePtr(lpData); }@=m[Zx#  
 if(nCount==1) X&nkc/erx  
  m_Number.Format("%d picture captured.",nCount); kD dY i7g>  
 else A ^ $9[_  
  m_Number.Format("%d pictures captured.",nCount); b2u_1P\  
  UpdateData(FALSE); +6@".<  
} 9_V'P]@  
h.>6>5$n  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Iz,a Hrq  
{ &1YAPxX  
 if(pMsg -> message == WM_KEYDOWN) km,}7^?F0r  
 { >e :&kp  
  if(pMsg -> wParam == VK_ESCAPE) v/=O:SM}  
   return TRUE; {c`kC]9  
  if(pMsg -> wParam == VK_RETURN) 6 DqV1'  
   return TRUE; VFz (U)._  
 } 2#~5[PtP^  
 return CDialog::PreTranslateMessage(pMsg); z #c)Q  
} 3ddH@Y|  
TzmoyY  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) " NnUu 8x  
{ H8.U#%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ u:tLO3VfJ  
  SaveBmp(); b<};"H0a  
  return FALSE; w]X~I/6g  
} D@*<p h=  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ W4Rs9NA}  
 CMenu pop; ; S7 %  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Uq `B#JI  
 CMenu*pMenu=pop.GetSubMenu(0); Bm2"} =  
 pMenu->SetDefaultItem(ID_EXITICON); = zW}vm }  
 CPoint pt; Zm,<2BP>  
 GetCursorPos(&pt); 0][PL%3Z  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); a<7Ui;^@  
 if(id==ID_EXITICON) Zy _A3m{  
  DeleteIcon(); ]f#ZU{A'mt  
 else if(id==ID_EXIT) -8;U1^#  
  OnCancel(); "f/lm 2<  
 return FALSE; fiqeXE?E  
} S {gB~W  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ax0RtqtR&  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :pj#t$:!  
 AddIcon(); $50A!h  
 return res; e}Cp;c]=  
} "- @{ )  
ysm)B?+k  
void CCaptureDlg::AddIcon() }/q]:3M|  
{ ~c~N _b  
 NOTIFYICONDATA data; *>,8+S33r{  
 data.cbSize=sizeof(NOTIFYICONDATA); .)~IoIW=  
 CString tip; d|CSWcU  
 tip.LoadString(IDS_ICONTIP); H4p N+  
 data.hIcon=GetIcon(0); !]=  
 data.hWnd=GetSafeHwnd(); F B-?{78~  
 strcpy(data.szTip,tip); jPU:&1(_ n  
 data.uCallbackMessage=IDM_SHELL; $ ,Y\  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; u^T)4~(  
 data.uID=98; &QFg=  
 Shell_NotifyIcon(NIM_ADD,&data); bzD <6Z  
 ShowWindow(SW_HIDE); hi4#8W  
 bTray=TRUE; DjUif "v  
} d6,SZ*AE  
.E}fk,hLB  
void CCaptureDlg::DeleteIcon() *-"DZ  
{ W m\HZ9PN  
 NOTIFYICONDATA data; unu%\f>^4  
 data.cbSize=sizeof(NOTIFYICONDATA); $}RBK'cr}  
 data.hWnd=GetSafeHwnd(); m[7@l  
 data.uID=98; > 5-z"f  
 Shell_NotifyIcon(NIM_DELETE,&data); G6wBZ?)k  
 ShowWindow(SW_SHOW); !j[Oy r|  
 SetForegroundWindow(); h}r64<Y2{  
 ShowWindow(SW_SHOWNORMAL); ?4v&TB@  
 bTray=FALSE; Jk=E"I6  
} :E'uV" j%  
N GP}Z4  
void CCaptureDlg::OnChange() 9nF;$ HB  
{ DU(QQ53  
 RegisterHotkey(); }tue`">h  
} OhMnG@@  
at"-X?`d  
BOOL CCaptureDlg::RegisterHotkey() e]F4w(*=  
{ A (z lX_  
 UpdateData(); t@(S=i7}-  
 UCHAR mask=0; .`qw8e}y#'  
 UCHAR key=0; x&>zD0\ :\  
 if(m_bControl) Q${0(#Nu  
  mask|=4; =yo?]ZS  
 if(m_bAlt) \`3YE~7J/  
  mask|=2; "cSH[/  
 if(m_bShift) V ':?rEN|  
  mask|=1; zzOc # /  
  key=Key_Table[m_Key.GetCurSel()]; yg34b}m{  
 if(bRegistered){ B^Y AKbY  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6t@kft>Nv  
  bRegistered=FALSE; A'Q=Do E  
 } w5zr Ek#  
 cMask=mask; pIcvsd  
 cKey=key; HUUN*yikj  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); p2T<nP<Pt  
 return bRegistered; 5n,?&+*L  
} USBU?WDt  
t* eZe`|  
  四、小结 rC )pCC  
2MS-e}mi  
  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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