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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: zB6u-4^wT  
  o;4e)tK  
  一、实现方法 B5,QJ W*  
k)usUP'  
  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: koEX4q  
UcLNMn|  
#pragma data_seg("shareddata") VMZ]n%XRXW  
HHOOK hHook =NULL; //钩子句柄 ]ZKt1@4AY  
UINT nHookCount =0; //挂接的程序数目 o47 f  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ^Z>B/aJq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 xPDA475Cw3  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey F\=Rm  
static int KeyCount =0;  Ep\  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 k/_8!^:'  
#pragma data_seg() FL#g9U>  
Uy59zB2|=  
  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。 ocl47)  
>PJtG]D  
  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: {#1j"  
2'<=H76  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR H/Ec^Lc+_  
cKey,UCHAR cMask) Awa|rIM  
{ |v$%V#Bo  
 BOOL bAdded=FALSE; \YlF>{LVe  
 for(int index=0;index<MAX_KEY;index++){ -M:hlwha  
  if(hCallWnd[index]==0){ q]N?@l]  
   hCallWnd[index]=hWnd; }>;ht5/i/  
   HotKey[index]=cKey; ewAH'H]o  
   HotKeyMask[index]=cMask; ~S^X"8(U  
   bAdded=TRUE; `o_fUOe8a  
   KeyCount++; juCG?}di;  
   break; XnE %$NJ  
  } 9jMC |oE  
 }  H\=LE  
 return bAdded; LGo2^Xx  
} cNuHXaWp  
//删除热键 k~1j/VHv  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oT|P1t.  
{ j(%gMVu  
 BOOL bRemoved=FALSE; 'z-;*!A}j  
 for(int index=0;index<MAX_KEY;index++){ L`jB)wF /J  
  if(hCallWnd[index]==hWnd){ aI={,\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $K?T=a;z  
    hCallWnd[index]=NULL; S~k 0@  
    HotKey[index]=0; %9QMzz5  
    HotKeyMask[index]=0; # 5y9L  
    bRemoved=TRUE; {}g %"mi#  
    KeyCount--; Z(Eke  
    break; jB%"AvIX  
   } $AA~]'O>6:  
  } my\o P(e\  
 } :T7?  
 return bRemoved; H ~[LJ5x  
} `!nJS|  
9U|<q  
m%oGzx+  
  DLL中的钩子函数如下: 2#AeN6\@  
7`b lGzP_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }iua] 4 |  
{ 9u ?)vR[@e  
 BOOL bProcessed=FALSE; }z%OnP  
 if(HC_ACTION==nCode) selP=Q!  
 { rb:<N%*t  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 1KTabj/C  
   switch(wParam) |jahpji6  
   {  !Tn0M;  
    case VK_MENU: qnq%mwDeD  
     MaskBits&=~ALTBIT; mW~i c  
     break; <$jKy3@  
    case VK_CONTROL: w0Fwd  
     MaskBits&=~CTRLBIT; Yzj%{fkh  
     break; ,8c dXt   
    case VK_SHIFT: =5y`(0 I`U  
     MaskBits&=~SHIFTBIT; B*?ZE4`  
     break; Hva2j<h  
    default: //judge the key and send message &l. x:eD  
     break; 5-8]N>/b!  
   } `*e4m  
   for(int index=0;index<MAX_KEY;index++){ L!;^ #g  
    if(hCallWnd[index]==NULL) 6P;o 6s  
     continue; -6rf( ER  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xClRO,-  
    {  r=fE8[,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1@A7h$1P  
     bProcessed=TRUE; 9?uqQ  
    } :O9P(X*  
   } Mn]}s:v  
  } G*i.a*9<)  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?SC3Vzr  
   switch(wParam) uu}a:qrY  
   { 1P_Fe[8  
    case VK_MENU:  5ZnSA9?  
     MaskBits|=ALTBIT; Y 3o^Euou  
     break; +w "XNl  
    case VK_CONTROL: =m`l%V[  
     MaskBits|=CTRLBIT; EfKM*;A  
     break; [O=W>l  
    case VK_SHIFT: 1^aykrnQ>  
     MaskBits|=SHIFTBIT; ;"1/#CY773  
     break; &&X$d!V  
    default: //judge the key and send message  bt;lq!g  
     break; fd4;mc1T  
   } @&?a]>L  
   for(int index=0;index<MAX_KEY;index++){ W|;nJs:e  
    if(hCallWnd[index]==NULL) C@%iQ]=  
     continue; a*Rz<08  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B-!guf rnY  
    { l <:`~\#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "E.\6sC  
     bProcessed=TRUE; xM&EL>m>L  
    } 1'NhjL  
   } o g_Ri$x8  
  } RNGO~:k?r  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 P,(9cyS{  
   for(int index=0;index<MAX_KEY;index++){ ~\2;i]|  
    if(hCallWnd[index]==NULL) ucw`;<d8  
     continue; 7g-Dfg.w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4Mk8Cpz  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Y|mW.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 1{^CfamF  
   } [!W5}=^H  
  } y'^F,WTM  
 } Q-[3j  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); a;%I\w;2  
} 5)w4)K-%  
SGt5~T xj  
  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: O47PkP8  
jQ6Xr&}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >wA+[81[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vruD U#  
5`"iq "5Cf  
  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: Qe_+r(3)k  
2zhn`m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^[#=L4  
{ L/~D<V  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) mIvnz{_d  
 { mxgqS=`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 jDkm:X}:  
  SaveBmp(); -!l^]MU  
  return FALSE; L ${m/@9  
 } :WVSJ,. !  
 …… //其它处理及默认处理 OZ=Cp$  
} f_rp<R>Uu  
Wj&nUp{  
$|k%@Q>  
  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。 l_6eI  
xpAok]  
  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。 ^CUSlnB\(  
)#a7'Ba  
  二、编程步骤 }B`Ku5 M  
*,17x`1e  
  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"; t ^m~  
>Co)2d]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; " CM ucK  
c+8V|'4  
  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; _C20 +PMO  
syR N4  
  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; iA9 E^  
nWk e#{[  
  5、 添加代码,编译运行程序。 5Dd:r{{ Q  
)9B:Y;>)  
三、程序代码 P].eAAXnP  
i3P9sdTD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "Kq>#I'%W  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) H'Nq#K  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ `Ug tvo  
#if _MSC_VER > 1000 h/HH Kn  
#pragma once uaaf9SL?  
#endif // _MSC_VER > 1000 <[ZI.+_Wt  
#ifndef __AFXWIN_H__ xz8G}Ku  
#error include 'stdafx.h' before including this file for PCH w.z<60%},0  
#endif JGis"e  
#include "resource.h" // main symbols 5rloK"  
class CHookApp : public CWinApp tb,9a!?  
{ P#MK  
 public: >'b=YlUL  
  CHookApp(); \x(^]/@  
  // Overrides lI6W$V\,  
  // ClassWizard generated virtual function overrides hO3 {  
  //{{AFX_VIRTUAL(CHookApp) rEM#D]k  
 public: {n&Uf{  
  virtual BOOL InitInstance(); [1SMg$@<  
  virtual int ExitInstance(); FY4T(4#  
  //}}AFX_VIRTUAL h&`y$Jj  
  //{{AFX_MSG(CHookApp) RYy,wVh}  
  // NOTE - the ClassWizard will add and remove member functions here. hF>u)%J/S  
  // DO NOT EDIT what you see in these blocks of generated code ! ,EI:gLH  
  //}}AFX_MSG Vm,,u F  
  DECLARE_MESSAGE_MAP() "(f`U.  
}; "}zt`3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); A[)C:q,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %j5ywr:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  to>  
BOOL InitHotkey(); -ihiG_f  
BOOL UnInit(); .T8K-<R  
#endif N=~~EtX  
J+ts  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. TH:W#Ot  
#include "stdafx.h" 59lj7  
#include "hook.h" sJU`u'w  
#include <windowsx.h> vy9dAl  
#ifdef _DEBUG ]iVLHVqz  
#define new DEBUG_NEW /iG7MC\`  
#undef THIS_FILE p!DP`Ouc3\  
static char THIS_FILE[] = __FILE__; =wrP:wYF  
#endif RB$ z]/=  
#define MAX_KEY 100 [Y8S[YY  
#define CTRLBIT 0x04 cbYK5fj"T  
#define ALTBIT 0x02 (s&&>M]r_  
#define SHIFTBIT 0x01 ? JXa~.dA  
#pragma data_seg("shareddata") UQPU"F7.  
HHOOK hHook =NULL; 5jZiJw(  
UINT nHookCount =0; dYF=c   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1m)M;^_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [>Fm [5x  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey _ck[&Q  
static int KeyCount =0; xaW{I7FfG  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift i=rH7k  
#pragma data_seg() .<YcSG  
HINSTANCE hins; 8@eOTzm  
void VerifyWindow(); v"!4JZ%K  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) *eb-rhCVn  
//{{AFX_MSG_MAP(CHookApp) >cgpajx*  
// NOTE - the ClassWizard will add and remove mapping macros here. tJU-<{8  
// DO NOT EDIT what you see in these blocks of generated code! .zkP~xQ~  
//}}AFX_MSG_MAP Md&WJ };L  
END_MESSAGE_MAP() U(,.D}PG  
:_HF j.JW  
CHookApp::CHookApp() 7lA:)a_!]  
{ `hUHel;6  
 // TODO: add construction code here, @ D[`Oj)  
 // Place all significant initialization in InitInstance /X#z*GX  
} \TbVS8e^  
DQ80B)<O  
CHookApp theApp; S v`qB'e2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) MbA\pG'T  
{ 4 b,N8  
 BOOL bProcessed=FALSE; 2?DRLF]  
 if(HC_ACTION==nCode) {x@|VuL=  
 { xDjV `E]  
  if((lParam&0xc0000000)==0xc0000000){// Key up T?wzwGp-[  
   switch(wParam) |"Z{I3Umg  
   { <+tD z(  
    case VK_MENU: q.V-LXM  
     MaskBits&=~ALTBIT; $/Ov2z  
     break; VW<0Lt3  
    case VK_CONTROL: (.23rVvnT@  
     MaskBits&=~CTRLBIT; j.|U=)E  
     break; ,D=fFpn  
    case VK_SHIFT: caq} &A]C  
     MaskBits&=~SHIFTBIT; tef^ShF]  
     break; QG3&p<  
    default: //judge the key and send message !mnUdR|>(  
     break; D1T@R)j  
   } #b)e4vwCq  
   for(int index=0;index<MAX_KEY;index++){ 3yO=S0`  
    if(hCallWnd[index]==NULL) KoBW}x9Jp  
     continue; DuF"*R~et  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {hdPhL  
    { ~Xv=9@,h  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `dW]4>`O  
     bProcessed=TRUE; w0J|u'H  
    } \".^K5Pm  
   } Zv!{{XO2;  
  } ,r^"#C0J}  
  else if((lParam&0xc000ffff)==1){ //Key down 57I}RMT"  
   switch(wParam) 8P: spD0  
   { F- rQ3  
    case VK_MENU: Ak BMwV  
     MaskBits|=ALTBIT; P'$ `'J]j  
     break; @g-Tk  
    case VK_CONTROL: MMQ;mw=^]  
     MaskBits|=CTRLBIT; v~)LO2y   
     break; n/Dp"4H%q  
    case VK_SHIFT: /-M@[p&  
     MaskBits|=SHIFTBIT; ,kM)7!]N  
     break; /X*oS&-M  
    default: //judge the key and send message #x@eDnb_  
     break; 5iX! lAFJ  
   } ~)]} 91p  
   for(int index=0;index<MAX_KEY;index++) 1vevEa$  
   { ULqoCd%bK  
    if(hCallWnd[index]==NULL) =xN= #  
     continue; -:Rp'SJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EL{vFP  
    { nt :N!suP3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T)iW`vZg8  
     bProcessed=TRUE; S4o$t -9l  
    } tkKJh !Q7  
   } {6Au3gt/  
  } rofNZ;nu  
  if(!bProcessed){ q_fam,9  
   for(int index=0;index<MAX_KEY;index++){ }JgYCsF/f  
    if(hCallWnd[index]==NULL) 8|g<X1H{M  
     continue; 8y2+&#$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) dK9Zg,DZL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  kLP0{A  
   } UQ?%|y*Kc  
  } Xrqx\X  
 } A[N{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0 p uY"[c  
} HIvZQQW|  
j}JZ  
BOOL InitHotkey() F7}-!  
{ _e<o7Y@_  
 if(hHook!=NULL){ T6BFX0$  
  nHookCount++; A#y@`} ]!'  
  return TRUE; r,(Mu  
 } Y3U9:VB  
 else +cu^%CXT  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); k!L@GQ  
  if(hHook!=NULL) zTm]AG|0  
   nHookCount++; } p:%[  
  return (hHook!=NULL); %&<LNEiUN  
} (P|pRVO  
BOOL UnInit() !nf-}z e{  
{ t+Bf#:  
 if(nHookCount>1){ 8?FueAM'  
  nHookCount--; GZ#aj|  
  return TRUE; ]$iqa"{  
 } 3lxc4@Zmd  
 BOOL unhooked = UnhookWindowsHookEx(hHook); L"+$Wc[|  
 if(unhooked==TRUE){ 2f:^S/.A  
  nHookCount=0; evuZY X@  
  hHook=NULL; 6;b9swmh  
 } ssQ BSbx  
 return unhooked; A<MtKb  
} `)$_YZq|SR  
VR? ^HA9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 19e8  
{ #s5N[uK^m  
 BOOL bAdded=FALSE; rRFAD{5)  
 for(int index=0;index<MAX_KEY;index++){ olux6RP[B  
  if(hCallWnd[index]==0){ }?8uH/+ZA  
   hCallWnd[index]=hWnd; Fj p.T;  
   HotKey[index]=cKey; JCniN";r[  
   HotKeyMask[index]=cMask; 9WG{p[  
   bAdded=TRUE; vIGw6BJI  
   KeyCount++; pW\'Z Rj  
   break; )X+mV  
  } [5d2D,)  
 }  a*dQ _  
 return bAdded; oMH.u^b]fT  
} |AZW9  
mh/n.*E7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4Ft1@  
{  Ukz;0q  
 BOOL bRemoved=FALSE; V4w=/e _  
 for(int index=0;index<MAX_KEY;index++){ Rd*[%)  
  if(hCallWnd[index]==hWnd){ $14:(<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vG41Ck1  
    hCallWnd[index]=NULL; ~+F;q vq  
    HotKey[index]=0; ?9+@+q  
    HotKeyMask[index]=0; rJyCw+N0  
    bRemoved=TRUE; >h~IfZU1  
    KeyCount--; (]2H7X:b  
    break; PXKJ^fa  
   } <cN~jv-w$  
  } m:QG}{<.h  
 } Pt,ebL~  
 return bRemoved; CB\{!  
} z`@^5_  
7E$&2U^Js  
void VerifyWindow() iP@6hG`:  
{ iPG0o %  
 for(int i=0;i<MAX_KEY;i++){ *~XA'Vw!  
  if(hCallWnd!=NULL){ YvL?j  
   if(!IsWindow(hCallWnd)){ Y$>-%KcKeI  
    hCallWnd=NULL; bzpFbfb  
    HotKey=0; m!n/U-^  
    HotKeyMask=0; I<oL}f  
    KeyCount--; >`RRP}u=u  
   } Ut@RGg+f8  
  } >H][.@LyR  
 } QbFHfA2Ij  
} q<vf,D@{ !  
I&yVx8aH}  
BOOL CHookApp::InitInstance() Wzq>JNn y  
{ c~}l8M %  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); vsB*rP=  
 hins=AfxGetInstanceHandle(); ;i uQ?MR3  
 InitHotkey(); . RVVWqW  
 return CWinApp::InitInstance(); 1Nn@L2b 2  
} Yf_6PGNzX  
;r\(p|e  
int CHookApp::ExitInstance() Z4TL6 ]^R  
{ w42OF7f  
 VerifyWindow(); ff? t[GS  
 UnInit(); Rg&- 0b  
 return CWinApp::ExitInstance(); )}v 3q6?_  
} R9vT[{!i  
$"JpFT  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {Bvj"mL]j  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) F?+3%>/A @  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {BBw$m,o  
#if _MSC_VER > 1000 >c8GW >\N  
#pragma once [4Ll0GSp  
#endif // _MSC_VER > 1000 ]w).8=I  
+]xFoH  
class CCaptureDlg : public CDialog Y&bM CI6U  
{ #EO1`9f48x  
 // Construction R"Liz3Vl%  
 public: yGBQ0o7E  
  BOOL bTray; +YY8h>hj  
  BOOL bRegistered; MZv]s  
  BOOL RegisterHotkey(); BbOu/i|  
  UCHAR cKey; kfb/n)b'  
  UCHAR cMask; w?vVVA  
  void DeleteIcon(); Xt/Ksw"wn  
  void AddIcon(); *O$CaAr\s  
  UINT nCount; O>y'Nqz  
  void SaveBmp(); "@3@/I  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor u^W2UE\  
  // Dialog Data $o?@ 0  
  //{{AFX_DATA(CCaptureDlg) 8OhDjWVJ  
  enum { IDD = IDD_CAPTURE_DIALOG }; W`rNBfG>  
  CComboBox m_Key; PaB!,<A  
  BOOL m_bControl; yqOuX>m1c  
  BOOL m_bAlt; EOKzzX7 S  
  BOOL m_bShift; h[tix:  
  CString m_Path; )ukpJ z""  
  CString m_Number; i8X`HbmN  
  //}}AFX_DATA Gi6T["  
  // ClassWizard generated virtual function overrides SjEAuRDvUz  
  //{{AFX_VIRTUAL(CCaptureDlg) vEe NW  
 public: .0HZNWRtb  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 4\5uY  
 protected: uYG^Pc^v  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t=euE{c  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *!e(A ]&  
  //}}AFX_VIRTUAL Fig&&b a  
  // Implementation qF)< H  
 protected: .y5,x\Pq(  
  HICON m_hIcon; {NM+Oj,~'  
  // Generated message map functions " K*  
  //{{AFX_MSG(CCaptureDlg) /(C~~XP)  
  virtual BOOL OnInitDialog(); "O>n@Q|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); m#H3:-h,  
  afx_msg void OnPaint(); cTZ.}eLh  
  afx_msg HCURSOR OnQueryDragIcon(); E N^Uki`  
  virtual void OnCancel(); I8   
  afx_msg void OnAbout(); {Z;t ^:s#  
  afx_msg void OnBrowse(); ^D67y%  
  afx_msg void OnChange(); 2 -!L _W(  
 //}}AFX_MSG }A$WO {2  
 DECLARE_MESSAGE_MAP() }1 vT)  
}; {4 >mc'dv  
#endif f2)XP$:  
7YWNd^FI V  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;)0w:Zn/[  
#include "stdafx.h" G`=r^$.3WB  
#include "Capture.h" o6kNx>tc)  
#include "CaptureDlg.h" AF\T\mtvRm  
#include <windowsx.h> N^?9ZO   
#pragma comment(lib,"hook.lib") woH)0v  
#ifdef _DEBUG BG2)v.CU  
#define new DEBUG_NEW ER&UBUu"  
#undef THIS_FILE o;F" {RZ  
static char THIS_FILE[] = __FILE__; em@EDMvI  
#endif XdEPbD-  
#define IDM_SHELL WM_USER+1 DR9: _  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G1T^a>tj4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -7>)i  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [(LV  
class CAboutDlg : public CDialog `rY2up#%  
{ I XA>`D  
 public: "7%:sty  
  CAboutDlg(); DLE8+NV8   
  // Dialog Data C2e.2)y  
  //{{AFX_DATA(CAboutDlg) ][PzgzG  
  enum { IDD = IDD_ABOUTBOX }; nCg66-3A  
  //}}AFX_DATA ig"uXs  
  // ClassWizard generated virtual function overrides %6j)=IOts  
  //{{AFX_VIRTUAL(CAboutDlg) 0 5\dl  
 protected: 9e!NOl\_;.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support { Ng oYl  
  //}}AFX_VIRTUAL @pV5}N[]  
  // Implementation "LhUxnll  
 protected: Zzua17  
  //{{AFX_MSG(CAboutDlg) ?gGt2O1J  
  //}}AFX_MSG rk2xKm^w  
  DECLARE_MESSAGE_MAP() z|R,&~:  
}; sf} Dh  
x90*yaw>h  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) _hf4A8ak  
{ +y+"Fyl  
 //{{AFX_DATA_INIT(CAboutDlg) `XTh1Z\  
 //}}AFX_DATA_INIT C z#Z<:  
} w-B^ [<  
~0"p*?^  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~iBgw&Y  
{ *TW=/+j  
 CDialog::DoDataExchange(pDX); G>qZxy`c  
 //{{AFX_DATA_MAP(CAboutDlg) q=HHNjj8  
 //}}AFX_DATA_MAP Qq-"Cg@-/  
} wJb#g0  
/h2b;"  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) T<yP* b2E  
 //{{AFX_MSG_MAP(CAboutDlg) gE/Tj$  
 // No message handlers +KGZ HO!  
 //}}AFX_MSG_MAP 1B>Vt*=  
END_MESSAGE_MAP() =tTqN+4  
+eX)48  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) u),Qa=Wp  
: CDialog(CCaptureDlg::IDD, pParent) %b.UPS@I  
{ ivgpS5 M`Y  
 //{{AFX_DATA_INIT(CCaptureDlg) o;"OSp  
  m_bControl = FALSE; 31+;]W=  
  m_bAlt = FALSE; ({0)@+V8  
  m_bShift = FALSE; c47")2/yO  
  m_Path = _T("c:\\"); Nb2Qp K  
  m_Number = _T("0 picture captured."); &}mw'_ I  
  nCount=0; < |O^>s;  
  bRegistered=FALSE; ~\nBjM2  
  bTray=FALSE; pb60R|k  
 //}}AFX_DATA_INIT 3Rg}+[b  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5(2|tJw-H;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =bh*[ , -  
} a>4uiFiv  
? ]sM8Bd}  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) SQsSa1  
{ \hO2p6  
 CDialog::DoDataExchange(pDX); qJ!Z~-hS  
 //{{AFX_DATA_MAP(CCaptureDlg) 4W4kwU6D  
  DDX_Control(pDX, IDC_KEY, m_Key); "o!{51!'  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Y/TlE?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Y-piL8Xc  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2s*#u<I  
  DDX_Text(pDX, IDC_PATH, m_Path); >M%\T}5  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Q0?\]2eet9  
 //}}AFX_DATA_MAP +^aFs S  
} O40+M)e]  
JN/UUfj  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wo2@hav  
//{{AFX_MSG_MAP(CCaptureDlg) ymY1o$qWB}  
 ON_WM_SYSCOMMAND() 80}+MWdo  
 ON_WM_PAINT() P47V:E%  
 ON_WM_QUERYDRAGICON() 6[ qA`x#  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -!RtH |P  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  GJi~y  
 ON_BN_CLICKED(ID_CHANGE, OnChange) EO|:FcW  
//}}AFX_MSG_MAP 5F+APz7  
END_MESSAGE_MAP() 9A,Z|q/z5  
qM4c]YIaSl  
BOOL CCaptureDlg::OnInitDialog() _Jz8{` "  
{ RT/o$$  
 CDialog::OnInitDialog(); 4rK{-jvh>m  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); A*h{Lsx;  
 ASSERT(IDM_ABOUTBOX < 0xF000); h<<>3A  
 CMenu* pSysMenu = GetSystemMenu(FALSE); u*S=[dq  
 if (pSysMenu != NULL) sRVIH A ,  
 { <%}QDO8\i  
  CString strAboutMenu; x}/,yaWZ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); tbo>%kn  
  if (!strAboutMenu.IsEmpty()) |LG4=j.l  
  { V~DMtB7  
   pSysMenu->AppendMenu(MF_SEPARATOR); [sV"ws  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); @tohNO>  
  } M6 9 w-  
 } "eWk#/  
 SetIcon(m_hIcon, TRUE); // Set big icon xp'_%n~K@  
 SetIcon(m_hIcon, FALSE); // Set small icon E9\vA*a  
 m_Key.SetCurSel(0); 'mCe=Y  
 RegisterHotkey(); sKz`aqI  
 CMenu* pMenu=GetSystemMenu(FALSE); 2I3h M D0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 'AGto'Yy;  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); WtQ8X|\`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); >F jR9B  
 return TRUE; // return TRUE unless you set the focus to a control j hYToMq  
} y4Z &@,_{  
!IU.a90V  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (@X~VACT  
{ # ,uya2!)  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |yyO q  
 { @WH@^u  
  CAboutDlg dlgAbout; ^2d!*W|  
  dlgAbout.DoModal(); f:*vr['d  
 } lN,/3\B  
 else UX-&/eScN  
 { ]3ONFa  
  CDialog::OnSysCommand(nID, lParam); &uP~rEJl+  
 } ELrsx{p:  
} { pu85'DV  
NW~z&8L  
void CCaptureDlg::OnPaint() E r/bO  
{ 4v p  
 if (IsIconic()) mOo`ZcTU  
 { IcP)FB 4  
  CPaintDC dc(this); // device context for painting d@w~[b  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zX5!vaEv  
  // Center icon in client rectangle j R=s#Xz  
  int cxIcon = GetSystemMetrics(SM_CXICON); b[z]CP  
  int cyIcon = GetSystemMetrics(SM_CYICON); w6`9fX6{h  
  CRect rect; Vz14j_  
  GetClientRect(&rect); T5urZq*R  
  int x = (rect.Width() - cxIcon + 1) / 2; gVeEdo`$<  
  int y = (rect.Height() - cyIcon + 1) / 2; %h1N3\y9i(  
  // Draw the icon ~HQ9i%exg  
  dc.DrawIcon(x, y, m_hIcon); /TS=7J#  
 } d0'J C*  
 else Z*G(5SqUh"  
 { '=][J_  
  CDialog::OnPaint(); j4=(H:c~E  
 } Lb LiB*D#s  
} p=/m  
Kn+S,1r  
HCURSOR CCaptureDlg::OnQueryDragIcon() H>r!i 4l  
{ tx?dIy;  
 return (HCURSOR) m_hIcon; v}WR+)uFQ  
} }b1cLchl  
T843":  
void CCaptureDlg::OnCancel() *<1r3!  
{ q2HYiH^L  
 if(bTray) 9@Cv5L?p\  
  DeleteIcon(); 3D?s L!W  
  CDialog::OnCancel(); S/;bU :  
} s3Cc;#  
o\vBOp?hj  
void CCaptureDlg::OnAbout() \.M*lqI  
{ p~LrPWHSTP  
 CAboutDlg dlg; % `Z! 4L  
 dlg.DoModal(); -G6U$  
} YBh'EL}P  
.k,YlFvj  
void CCaptureDlg::OnBrowse() w3jO6*_ M  
{ A 7[:5$  
 CString str; ftH:r_"O#  
 BROWSEINFO bi; FLEo*9u>b  
 char name[MAX_PATH]; @JdZ5Q  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); NHlk|Y#6b  
 bi.hwndOwner=GetSafeHwnd(); -*.-9B~u  
 bi.pszDisplayName=name; },|M9 I0  
 bi.lpszTitle="Select folder"; G@j0rnn>B  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; $AHQmyg<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); \TU3rk&X  
 if(idl==NULL) RejQ5'Neh  
  return; 37}D9:#5C  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); V')0 Mr  
 str.ReleaseBuffer(); EYA,hc  
 m_Path=str; 47J5oPT2'  
 if(str.GetAt(str.GetLength()-1)!='\\') qP<Lr)nUH  
  m_Path+="\\"; B#9{-t3Vf  
 UpdateData(FALSE); R##~*>#  
} NO :a;  
6Cp]NbNrq  
void CCaptureDlg::SaveBmp() tJN<PCG6"  
{ F:aILx  
 CDC dc; ?,/U^rf^4  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .ji_nZ4.+  
 CBitmap bm; }NB}"%2  
 int Width=GetSystemMetrics(SM_CXSCREEN); ({o'd=nO  
 int Height=GetSystemMetrics(SM_CYSCREEN); 4bgqg0z>  
 bm.CreateCompatibleBitmap(&dc,Width,Height); -IV]U*4  
 CDC tdc; }\C-} Q  
 tdc.CreateCompatibleDC(&dc); = 9 T$Gr  
 CBitmap*pOld=tdc.SelectObject(&bm); q:g2Zc'Y~W  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *z7dl5xJ  
 tdc.SelectObject(pOld); Dwzg/F(  
 BITMAP btm; c%qv9   
 bm.GetBitmap(&btm);  Tgl}  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; #Skv(IL  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); sq'Pyz[[  
 BITMAPINFOHEADER bih; `/_G$_  
 bih.biBitCount=btm.bmBitsPixel; 9YBv|A  
 bih.biClrImportant=0; +zs4a96[  
 bih.biClrUsed=0; H$6`{lx,  
 bih.biCompression=0; 3)RsLI9  
 bih.biHeight=btm.bmHeight; 3'X.}>o   
 bih.biPlanes=1; SCTA=l.  
 bih.biSize=sizeof(BITMAPINFOHEADER); LcE+GC  
 bih.biSizeImage=size; &zo|Lfe  
 bih.biWidth=btm.bmWidth; t2"FXTAq  
 bih.biXPelsPerMeter=0; M.>l#4s,'  
 bih.biYPelsPerMeter=0; \7*`}&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); *2GEnAZb7n  
 static int filecount=0; BXyo  
 CString name; }RP @!=  
 name.Format("pict%04d.bmp",filecount++); =yy5D$\  
 name=m_Path+name; & j+oJasI  
 BITMAPFILEHEADER bfh; %D[0nt|X  
 bfh.bfReserved1=bfh.bfReserved2=0; vEn4L0D  
 bfh.bfType=((WORD)('M'<< 8)|'B'); hh[jN 7K  
 bfh.bfSize=54+size; ERN>don2  
 bfh.bfOffBits=54; /g4f`$a  
 CFile bf; &ZQJ>#~j^  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ b?'yAXk  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); cA:*V|YV `  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); S1?-I_t+]  
  bf.WriteHuge(lpData,size); \oZ5JoO  
  bf.Close(); *H|M;G  
  nCount++; (V HL{rj  
 } %?Ev|:i`@  
 GlobalFreePtr(lpData); W='> :H  
 if(nCount==1) @n": w2^B  
  m_Number.Format("%d picture captured.",nCount); \0gM o&  
 else 9U%N@Dq`Z  
  m_Number.Format("%d pictures captured.",nCount); :*2ud(  
  UpdateData(FALSE); L{`JRu  
} GbaEgA'fa  
N~xLu8,  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /n8B,-Z5s5  
{ Kc^;vT>3  
 if(pMsg -> message == WM_KEYDOWN) z'EajBB\f  
 { D N*t~Z3[  
  if(pMsg -> wParam == VK_ESCAPE) _zwUE  
   return TRUE; ` 5C~  
  if(pMsg -> wParam == VK_RETURN) qC?:*CXH  
   return TRUE; $ <#KA3o\  
 } 2]ape !(  
 return CDialog::PreTranslateMessage(pMsg); >:|q&|x-  
} >lIk9|  
}B.H|*uO  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d:U9pC$  
{ JC3m.)/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ x HhN  
  SaveBmp(); _Iv6pNd/  
  return FALSE; 6 M*O{f  
} )6J9J+%bi  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <N9[?g)  
 CMenu pop; b^$|Nz;  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); McQe1  
 CMenu*pMenu=pop.GetSubMenu(0); w2'f/  
 pMenu->SetDefaultItem(ID_EXITICON); jYhB +|  
 CPoint pt; s=QAO!aw  
 GetCursorPos(&pt); dp*u9z~NA  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c. 2).Jt,  
 if(id==ID_EXITICON) Ch3jxgQY  
  DeleteIcon(); 7 !JQB  
 else if(id==ID_EXIT) D'Y-6W3  
  OnCancel(); BjzPz  
 return FALSE; k>g _Z`%<  
} k-{<=>uM  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [+DW >Et  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) AQ[GO6$,%H  
 AddIcon(); X'qU*Eo  
 return res; tyqT  
} uvG]1m#  
f V'ZsJ N  
void CCaptureDlg::AddIcon() ]h %Wiw  
{ [S>2ASj  
 NOTIFYICONDATA data; f__cn^1  
 data.cbSize=sizeof(NOTIFYICONDATA); *5^Q7``  
 CString tip; aN8|J?JH  
 tip.LoadString(IDS_ICONTIP); S_IUV)  
 data.hIcon=GetIcon(0); l.NEkAYPmH  
 data.hWnd=GetSafeHwnd(); ?3.b{Cq{-  
 strcpy(data.szTip,tip); j4uvS!  
 data.uCallbackMessage=IDM_SHELL; y3o25}"  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ?I~()]k5  
 data.uID=98; "$N+"3I  
 Shell_NotifyIcon(NIM_ADD,&data); 5Ezw ~hn  
 ShowWindow(SW_HIDE); n' q4  
 bTray=TRUE; esMX-.8Cx  
} 7B\Vs-d  
`u teg=  
void CCaptureDlg::DeleteIcon() yooX$  
{ e(GP^oK  
 NOTIFYICONDATA data; :i. {  
 data.cbSize=sizeof(NOTIFYICONDATA); J2xw) +  
 data.hWnd=GetSafeHwnd(); E4~<V=2l  
 data.uID=98; +>{Y.`a;Jo  
 Shell_NotifyIcon(NIM_DELETE,&data); )E-inHD /  
 ShowWindow(SW_SHOW); vPTM  
 SetForegroundWindow(); }n3/vlW9  
 ShowWindow(SW_SHOWNORMAL); G?;e-OhV  
 bTray=FALSE; |n,<1QY  
} rp!oO>F  
4O)1uF;  
void CCaptureDlg::OnChange() V`XNDNJ:  
{ HoRg^Ai?\  
 RegisterHotkey(); Hn%xDJ'  
} 7G}2,ueI  
DkvF5c&  
BOOL CCaptureDlg::RegisterHotkey() , P70J b  
{ <FcG oGK  
 UpdateData(); =,_ +0M9  
 UCHAR mask=0; QSszn`e  
 UCHAR key=0; !`,Sfqij  
 if(m_bControl) 4'a=pnE$  
  mask|=4; 2ZG5<"DQ"  
 if(m_bAlt) 5 ft`zf  
  mask|=2; uj R_"r|l  
 if(m_bShift) V9{]OV%  
  mask|=1; 6/r)y+H  
  key=Key_Table[m_Key.GetCurSel()]; 1p/3!1  
 if(bRegistered){ -ZRO@&tMD  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,y 2$cO_>  
  bRegistered=FALSE; VcSVu  
 } Rn9m]x  
 cMask=mask; ,!Z *5  
 cKey=key; {f2S/$q  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); T"E6y"D  
 return bRegistered; $o0 iLFIX/  
} zMm#Rhn  
17oa69G  
  四、小结 &eCa0s?mI  
:U3kW8;UMP  
  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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