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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: lgiKNZgB?  
  kbb!2`F!%  
  一、实现方法 UZs '[pm)  
&j:prc[W  
  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: Cydo~/  
VC/n}7p  
#pragma data_seg("shareddata") ]*| hd/j  
HHOOK hHook =NULL; //钩子句柄 HcIJ&".~  
UINT nHookCount =0; //挂接的程序数目 QEqYqAGzu|  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4_-&PZ,d  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Np~qtR  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m|Z[8Tup  
static int KeyCount =0; ?K.!^G  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 el^<M,7!  
#pragma data_seg() Z\?!& &  
,5sv;  
  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。 6|Rj YX  
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  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: KA`)dMWL  
4 >D5t)254  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR H/G;hk  
cKey,UCHAR cMask) wz'in  
{ NXE1v~9V  
 BOOL bAdded=FALSE; 8wS9%+  
 for(int index=0;index<MAX_KEY;index++){ 6>EoU-YX}l  
  if(hCallWnd[index]==0){ OL&VisJ{75  
   hCallWnd[index]=hWnd; j!"NEh78H  
   HotKey[index]=cKey; lo >:S1  
   HotKeyMask[index]=cMask; wi:d!,P`e  
   bAdded=TRUE; %bnjK#o"Q  
   KeyCount++; 69C ss'  
   break; JDMsco+j5  
  } K*MI8')  
 } ]<O -  
 return bAdded; t2%gS" [  
} jmnrpXaAx  
//删除热键 w?p8)Q6m  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z~7}  
{ <gr2k8m6$  
 BOOL bRemoved=FALSE; inx0W3d"T  
 for(int index=0;index<MAX_KEY;index++){ iw EHEi%  
  if(hCallWnd[index]==hWnd){ M$LzV}k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yz=6 V%  
    hCallWnd[index]=NULL; '#8;bU  
    HotKey[index]=0; $2*&\/;-E!  
    HotKeyMask[index]=0; " []J[!}x  
    bRemoved=TRUE; C)s*1@af  
    KeyCount--; KTu&R6|  
    break; fm,:8%  
   } y/A<eHLy  
  } X`n*M]  
 } p$%g$K  
 return bRemoved; E;x~[MA  
} p/uOCQ|1l  
S{ !m})1?  
Z$a4@W9o  
  DLL中的钩子函数如下: 3H47 vm(`  
QJ-?6 7_i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ('px X+  
{ 5B=Wnau  
 BOOL bProcessed=FALSE; F1o"H/:n  
 if(HC_ACTION==nCode) y0XI?Wr  
 { 5Bc)QKh`l|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 RJI*ZNb A  
   switch(wParam) 0<S(zva7([  
   {  zoBjrAyD  
    case VK_MENU: X{riI^(  
     MaskBits&=~ALTBIT; @$'1  
     break; dQL! >6a  
    case VK_CONTROL: $$G^#t1=XZ  
     MaskBits&=~CTRLBIT; >taZw '  
     break; %z0@4G q  
    case VK_SHIFT: W(tXq  
     MaskBits&=~SHIFTBIT; $ /(H%f&  
     break; SB[,}h<u1  
    default: //judge the key and send message MXhRnVz"W  
     break; S.OGLLprp  
   } \ o&i63u  
   for(int index=0;index<MAX_KEY;index++){ v)2@;Q  
    if(hCallWnd[index]==NULL) 2={ g'k(  
     continue; !f\6=Z?>3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w65 $ R  
    { #B)`dA0a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); thDE 1h  
     bProcessed=TRUE; ~1h-LbFI2  
    } t(MlZ>H  
   } } q ? iJ?P  
  } )V}u1C-N  
  else if((lParam&0xc000ffff)==1){ //有键按下 \ca4X{x  
   switch(wParam) ,O(XNA(C  
   { 6C/D&+4  
    case VK_MENU: e"|9%AW@<  
     MaskBits|=ALTBIT; {_/6,22j(V  
     break; +o/;bm*U<K  
    case VK_CONTROL: 6CU8BDN  
     MaskBits|=CTRLBIT; /HDX[R   
     break; T "G!H  
    case VK_SHIFT: ZcO!cR&*'J  
     MaskBits|=SHIFTBIT; *<#&ne 8  
     break; 73.o{V  
    default: //judge the key and send message D0k7)\puQ  
     break; :WCUHQ+  
   }  (lPNMS|V  
   for(int index=0;index<MAX_KEY;index++){ @3S2Xb{ra1  
    if(hCallWnd[index]==NULL) i]$7w! r&  
     continue; ]-fZeyY$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uX0wg  
    { <qRw! 'S^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {fN_itn  
     bProcessed=TRUE; T)Nis~  
    } rjR  
   } IW BVfN->}  
  } j^!J: Bj  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 4 |5ekwk  
   for(int index=0;index<MAX_KEY;index++){ nC&rQQFF  
    if(hCallWnd[index]==NULL) UU ,)z  
     continue; =0]Mc$Ih  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1[Mr2@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Z.mV fy%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 c3pt?C  
   } J/=A f [  
  } P`%ppkzV6  
 } h?1pGz)[C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =}"hC`3e  
} &S-& 'ZAY  
E8dp  
  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: 7Rh:+bT  
`k\1vum  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [qI*]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &+^ # `nq  
f:Ja  
  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: s+w<!`-  
=Ffq =<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [:=[QlvV  
{ #&:nkzd  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) E0h p%:  
 { W|Tew-H{h_  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ,6bMf z  
  SaveBmp(); ["IJ h  
  return FALSE; mT>p:G  
 } :58'U|  
 …… //其它处理及默认处理 S p )}  
} lG+ltCc$9  
yy74>K  
4Qo1f5 >N  
  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。 M0e|G.S&_  
I7_D $a=  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 9C 05  
2"'8x?.V  
  二、编程步骤 Z4-dF;7  
#G=QL(f>/  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ~b[4'm@  
-8jqC6mQ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; (R<4"QbE  
Kzu9Qm-+z^  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; W>bW1h  
=k7\g /  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; |Z^g\l.j{  
z}tp0~C  
  5、 添加代码,编译运行程序。 hr6e1Er  
>#U <#  
三、程序代码 cu?(P ;mQi  
0P40K  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )9*3^v  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) I*S`I|{J  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Z"|P(]A  
#if _MSC_VER > 1000 _xg VuJ   
#pragma once sLi//P?:t  
#endif // _MSC_VER > 1000 G=5t5[KC  
#ifndef __AFXWIN_H__ ?EQ^n3U$  
#error include 'stdafx.h' before including this file for PCH e=z_+gVm  
#endif akW3\(W}  
#include "resource.h" // main symbols qZsddll  
class CHookApp : public CWinApp UZ\*]mxT  
{ k)K-mD``U  
 public: 5 t`ap  
  CHookApp(); V<V\0n!0  
  // Overrides r82o[+$u0K  
  // ClassWizard generated virtual function overrides IPR tm!  
  //{{AFX_VIRTUAL(CHookApp) }`N2ZxC0AQ  
 public: kTZx-7~  
  virtual BOOL InitInstance(); 4<Sa,~4  
  virtual int ExitInstance(); TBKd|D'H  
  //}}AFX_VIRTUAL mHEf-6|C`  
  //{{AFX_MSG(CHookApp) %^5@z1d,  
  // NOTE - the ClassWizard will add and remove member functions here. j"IM,=  
  // DO NOT EDIT what you see in these blocks of generated code ! qm}>J^hnB#  
  //}}AFX_MSG iE^a%|?}  
  DECLARE_MESSAGE_MAP() _/ }6  
}; t0J5v;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6=,#9C9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2>}\XKF).  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^~6]0$yJ  
BOOL InitHotkey(); #jLaIXms  
BOOL UnInit(); WTD49_px  
#endif OOBcJC  
~kYqGH  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. (HaKF7Jsi  
#include "stdafx.h" _rMT{q3  
#include "hook.h" %]<RRH.w  
#include <windowsx.h> xEiX<lguyN  
#ifdef _DEBUG ;sChxQ=.^  
#define new DEBUG_NEW |#&V:GZp  
#undef THIS_FILE mUt,Z^ l`  
static char THIS_FILE[] = __FILE__; A }-&C  
#endif O5^J!(.O\Z  
#define MAX_KEY 100 !FB \h<6  
#define CTRLBIT 0x04 #$t}T@t>  
#define ALTBIT 0x02 ~n/Aq*  
#define SHIFTBIT 0x01 *D'22TO[[!  
#pragma data_seg("shareddata") R[zpD%CI  
HHOOK hHook =NULL; ew>XrT=Zm  
UINT nHookCount =0; =mO vs  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey fe\mL mK9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT dcDyK!zz"  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey M,j U}yD3  
static int KeyCount =0; []\+k31D  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift qrb[-|ie&  
#pragma data_seg() TJ2=m 9Z  
HINSTANCE hins; Lm iOhx  
void VerifyWindow(); $jjfC  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _'#n6^Us<  
//{{AFX_MSG_MAP(CHookApp) Q7HRzA^-  
// NOTE - the ClassWizard will add and remove mapping macros here. Z_LFIz*c  
// DO NOT EDIT what you see in these blocks of generated code! R}-(cc%5  
//}}AFX_MSG_MAP %41m~Wh2  
END_MESSAGE_MAP() >"??!|XG^  
>Rl"  
CHookApp::CHookApp() &xU[E!2H%  
{ `XJG(Oas\  
 // TODO: add construction code here, LGq'WU31:)  
 // Place all significant initialization in InitInstance TEP,Dq  
} T]^62(So  
)cW#Rwu_A4  
CHookApp theApp; \S"isz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {dhXIs  
{ Yz'K]M_Dq  
 BOOL bProcessed=FALSE; kI,yU}<Fq  
 if(HC_ACTION==nCode) ])[[ V!1  
 { ;nI] !g:  
  if((lParam&0xc0000000)==0xc0000000){// Key up /}((l%UE.  
   switch(wParam) ^a/gBC82x  
   { ]RZ|u*l=x  
    case VK_MENU: +=>,Pto<  
     MaskBits&=~ALTBIT; sSr&:BOsi  
     break; Z|&MKG24  
    case VK_CONTROL: VRVO-Sk  
     MaskBits&=~CTRLBIT; Rm2yPuOU}A  
     break; A9[ F  
    case VK_SHIFT: NyaQI<5D  
     MaskBits&=~SHIFTBIT; 4`lLf  
     break; /?wtF4  
    default: //judge the key and send message EZgq ?l~5O  
     break; 48J@C vU  
   } O+nEXS\rQ  
   for(int index=0;index<MAX_KEY;index++){ HNb/-e ,"  
    if(hCallWnd[index]==NULL) UZWioxsKr+  
     continue; ^NLmgw Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Je';9(ZK  
    { -5)H<dAQZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P@,nA41,j  
     bProcessed=TRUE; :,J}z~I,lB  
    } SQqD:{#g"  
   } l2l(_$@3  
  } 6(G?MW.  
  else if((lParam&0xc000ffff)==1){ //Key down _cc#Qlw 7  
   switch(wParam) DwrO JIy  
   { ^my].Qpt  
    case VK_MENU: rFC" Jx  
     MaskBits|=ALTBIT; U7I qST  
     break; 3:8{"md@2  
    case VK_CONTROL: QF&W`c  
     MaskBits|=CTRLBIT; I_xX Dr  
     break; /Wy.>YC|  
    case VK_SHIFT: Sp}tD<V  
     MaskBits|=SHIFTBIT; RTv qls  
     break; RLSc+kDH_  
    default: //judge the key and send message Clh!gpB c  
     break; 2Sh  
   } Er{#ziN+  
   for(int index=0;index<MAX_KEY;index++) +reor@h  
   { 3"G>>nC&  
    if(hCallWnd[index]==NULL) 6e _dJ=_  
     continue; {; .T7dL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (4\d]*u5-c  
    { 7f~Sf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1.gG^$Jd  
     bProcessed=TRUE; Tp0bS  
    } SF5@Vg  
   } lhtZaU~V  
  } kdn'6>\  
  if(!bProcessed){ ZKXo-~=>  
   for(int index=0;index<MAX_KEY;index++){ D`xHD#j h  
    if(hCallWnd[index]==NULL) >-O/U5<!  
     continue; :OW ;?{ ~j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) x3u4v~ "-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g7&9"  
   } La@ +>  
  } .58qL-iC  
 } Wy ZL9K{?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |gsE2vV  
} )x]3Zq  
qY >{cjo  
BOOL InitHotkey() ua OKv.%  
{ Vur bW=~g  
 if(hHook!=NULL){ @]![o %  
  nHookCount++; r%e KFS  
  return TRUE; 1]}#)-  
 } JkGnKm9G  
 else ) /v6l  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); rvyr xw%[  
  if(hHook!=NULL) ]IL;`>Gp  
   nHookCount++; ~`D|IWMDq  
  return (hHook!=NULL); vA X|hwn;  
} 3mSXWl^?  
BOOL UnInit() E7Ulnvd  
{ 7Su#Je]  
 if(nHookCount>1){ t!2(7=P30(  
  nHookCount--; >+mD$:L  
  return TRUE; Qjnd6uv{I  
 } T<I=%P)  
 BOOL unhooked = UnhookWindowsHookEx(hHook); zz^F k&  
 if(unhooked==TRUE){ 1&/FG(*/  
  nHookCount=0; 6&!&\  
  hHook=NULL; Uh'#izm[l  
 } (o J9k[(  
 return unhooked; fS:1^A2,  
} KE1ao9H8wR  
!J =sk4T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5qf BEPJ  
{ g!i45-n3gt  
 BOOL bAdded=FALSE; 0oh]61g C  
 for(int index=0;index<MAX_KEY;index++){ (Z}>1WRju  
  if(hCallWnd[index]==0){ UYA_jpIP  
   hCallWnd[index]=hWnd; |8bq>01~  
   HotKey[index]=cKey; Q`#4W3-,  
   HotKeyMask[index]=cMask; n$aA)"A #  
   bAdded=TRUE; *0_yT$  
   KeyCount++; DOz\n|8S  
   break; {ls+d x/  
  } W[[bV  
 } ZvGgmLN  
 return bAdded; KvQ,;A  
} 5[{*{^F4  
!WkIi^T  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E`j-6:  
{ \7z^!m  
 BOOL bRemoved=FALSE; 9e U[*S  
 for(int index=0;index<MAX_KEY;index++){ K\^ 0_F K  
  if(hCallWnd[index]==hWnd){ jEz+1Nl)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ iU+nqY'  
    hCallWnd[index]=NULL; dJ:MjQG`W  
    HotKey[index]=0; \#'TNmS  
    HotKeyMask[index]=0; \tyg(srw0  
    bRemoved=TRUE; =N);v\ Q$!  
    KeyCount--; W2;N<[wa<u  
    break; zciCcrJ  
   } <As9>5|%  
  } qpJ{2Q  
 } ( #Z`  
 return bRemoved; QHBtWQgS  
} OndhLLz  
k#}g,0@  
void VerifyWindow() QIB>rQCceo  
{ mgZf3?,)  
 for(int i=0;i<MAX_KEY;i++){ O;[9_[  
  if(hCallWnd!=NULL){ 5~XN>>hp  
   if(!IsWindow(hCallWnd)){ Fk=}iB#(  
    hCallWnd=NULL; he+#Q 6  
    HotKey=0; iP3Z  
    HotKeyMask=0; Dbx~n#nG  
    KeyCount--; w(nHD*nm  
   } s|bM%!$1  
  } V+wH?H=  
 } bVr*h2 p  
} \nrP$  
pN[0YmY#  
BOOL CHookApp::InitInstance() ?lCd{14Mkh  
{ |4Ck;gg!j  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); sTHq&(hLUG  
 hins=AfxGetInstanceHandle(); Fs/?  
 InitHotkey(); o[6y+<'o  
 return CWinApp::InitInstance(); ts9pM~_~  
} PHM:W%g:  
7q9gngT1LA  
int CHookApp::ExitInstance() $<)Yyi>6E  
{ ^%oUmwP<$  
 VerifyWindow(); 6\d X  
 UnInit(); I12KT~z<r  
 return CWinApp::ExitInstance(); \6j^k Y=  
} _.18z+  
z xZtz  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file j,%EW+j$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) !#D=w$@r:  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =)<3pGO  
#if _MSC_VER > 1000 P]<= ! F  
#pragma once 9|:^k.  
#endif // _MSC_VER > 1000 q{4|Kpx@  
mU{4g`Iw  
class CCaptureDlg : public CDialog !DjT<dxf  
{ W5DbFSgB  
 // Construction ( 76{2  
 public: aSnp/g  
  BOOL bTray; /-*hjX$n  
  BOOL bRegistered; ^3I'y UsY  
  BOOL RegisterHotkey(); ,=w!vO5s  
  UCHAR cKey; : 1)}Epo,  
  UCHAR cMask; \gKdD S  
  void DeleteIcon(); 99ASIC!  
  void AddIcon(); KXBL eR&^  
  UINT nCount; w{7 ji}  
  void SaveBmp(); w(/#isC  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor y-C=_v_X  
  // Dialog Data bzj9U>eY  
  //{{AFX_DATA(CCaptureDlg) TgC8EcLr  
  enum { IDD = IDD_CAPTURE_DIALOG };  j`H5S  
  CComboBox m_Key; (p6$Vgdt  
  BOOL m_bControl; 1=o|[7  
  BOOL m_bAlt; F"I{_yleq'  
  BOOL m_bShift; 9c pjO  
  CString m_Path; Ebk9[=  
  CString m_Number; `3wzOMgJ  
  //}}AFX_DATA HV0!G-h  
  // ClassWizard generated virtual function overrides }253Q!f  
  //{{AFX_VIRTUAL(CCaptureDlg) XHN*'@ 77;  
 public: Wb)>APL  
  virtual BOOL PreTranslateMessage(MSG* pMsg); yLFZo"r  
 protected: t 0 omJP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;7/ ;4Z  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); J~jxmh  
  //}}AFX_VIRTUAL ` @PHV  
  // Implementation 5Yxs_t4  
 protected: uDe%M  
  HICON m_hIcon; JyiP3whW  
  // Generated message map functions |M;tAG$,"y  
  //{{AFX_MSG(CCaptureDlg) bh Nqj  
  virtual BOOL OnInitDialog(); s8O.yL  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); mK Ta.  
  afx_msg void OnPaint(); l^~E+F~  
  afx_msg HCURSOR OnQueryDragIcon(); 0aWy!d  
  virtual void OnCancel(); 5u:{lcC.X  
  afx_msg void OnAbout(); (7zdbJX  
  afx_msg void OnBrowse(); 2bnF#-(  
  afx_msg void OnChange(); {?+dVLa^;  
 //}}AFX_MSG NP+*L|-;  
 DECLARE_MESSAGE_MAP() B8G9V6KS-  
}; 7>@g)%",  
#endif Uo<iZ3J  
U??T>  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Id(wY$C&>  
#include "stdafx.h" TXH9BlDn  
#include "Capture.h" U%PII>s'#  
#include "CaptureDlg.h" QIb4ghm,  
#include <windowsx.h> bP+b~!3  
#pragma comment(lib,"hook.lib") 1woBw>g  
#ifdef _DEBUG [(81-j1v  
#define new DEBUG_NEW n){F FM  
#undef THIS_FILE _yH=w'8.  
static char THIS_FILE[] = __FILE__; ,suC`)R  
#endif WVMkLMg8d  
#define IDM_SHELL WM_USER+1 Q($.s=&l;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Vi:<W0:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aP`[O]8j  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3W#f Fy  
class CAboutDlg : public CDialog "Vw;y+F}  
{ =X24C'!Mpe  
 public: Vmb `%k20'  
  CAboutDlg(); s9\HjK*+  
  // Dialog Data ]A.tauSW  
  //{{AFX_DATA(CAboutDlg) xlHC?d0}  
  enum { IDD = IDD_ABOUTBOX }; %fzZpd]v=,  
  //}}AFX_DATA 15)y]N={^  
  // ClassWizard generated virtual function overrides wMx# dP4W8  
  //{{AFX_VIRTUAL(CAboutDlg) P_y8[Y]?  
 protected: rL9u7) x  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z{p)rscX  
  //}}AFX_VIRTUAL ,bU 8S\8  
  // Implementation x[m&ILr  
 protected: ),%(A~\  
  //{{AFX_MSG(CAboutDlg) 0D Q\akh  
  //}}AFX_MSG xn BL{ []  
  DECLARE_MESSAGE_MAP() K:_5#!*^98  
}; VKtZyhK"h  
= VFPZ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) KhFw%Z0s<  
{ BJ$\Mb##3@  
 //{{AFX_DATA_INIT(CAboutDlg) 65g"$:0  
 //}}AFX_DATA_INIT &X`zk  
} a%igc^GS2  
fk)5TPc^  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) L&nqlH@+~  
{ )B1gX>J\8  
 CDialog::DoDataExchange(pDX); NKX62 ZC  
 //{{AFX_DATA_MAP(CAboutDlg) \YN(rD-  
 //}}AFX_DATA_MAP 4eh~/o&h  
} 83[gV@LW0m  
67]kT%0  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) r}%2;!T  
 //{{AFX_MSG_MAP(CAboutDlg) k&M9Hn2  
 // No message handlers -l2aAK1M  
 //}}AFX_MSG_MAP G-#]|)  
END_MESSAGE_MAP() eCfy'US;@3  
EH2a  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) <GRplkf`  
: CDialog(CCaptureDlg::IDD, pParent) ~bsL W:.'  
{ -]$=.0 l  
 //{{AFX_DATA_INIT(CCaptureDlg) 6%Ws>H4@|  
  m_bControl = FALSE; E,EpzB$_dj  
  m_bAlt = FALSE; }]K^b1Fs5  
  m_bShift = FALSE; LF?MO1!M  
  m_Path = _T("c:\\"); VQe@H8>3  
  m_Number = _T("0 picture captured."); -s5>GwZt  
  nCount=0; T:?01?m  
  bRegistered=FALSE; |w)S &+  
  bTray=FALSE; 898=9`7e  
 //}}AFX_DATA_INIT k'b'Ay(<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 E!SxO~  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 23_\UTM}1  
} 9&VfbrBM  
2nsW)bd  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7!r)[2l  
{ z pV+W-j]  
 CDialog::DoDataExchange(pDX); HgfeSH  
 //{{AFX_DATA_MAP(CCaptureDlg) Fmo^ ?~b  
  DDX_Control(pDX, IDC_KEY, m_Key); zhW.0:9 CR  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3`3`iN!8\@  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *\4u:1Cu  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ]Ac&h aAP  
  DDX_Text(pDX, IDC_PATH, m_Path); x=jS=3$8  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2 ,bLEhu  
 //}}AFX_DATA_MAP ?jy6%Y#,i  
} +w(>UBy-  
=(%+S<}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) #\LsM ~,  
//{{AFX_MSG_MAP(CCaptureDlg) ^+b ??K  
 ON_WM_SYSCOMMAND() $EUlh^  
 ON_WM_PAINT() SIr^\iiOB  
 ON_WM_QUERYDRAGICON() klON6<w  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) w]Byl3}Gt  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u?-X07_  
 ON_BN_CLICKED(ID_CHANGE, OnChange) q\q8xF~[p  
//}}AFX_MSG_MAP >|!s7.H/J/  
END_MESSAGE_MAP() v5Qp[O_  
yL.Z{wd  
BOOL CCaptureDlg::OnInitDialog() %V2A}78  
{ ~o?(O1QY  
 CDialog::OnInitDialog(); @Fs2J_v  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); WY3D.z-</  
 ASSERT(IDM_ABOUTBOX < 0xF000); %M KZ':m  
 CMenu* pSysMenu = GetSystemMenu(FALSE); fRT4,;  
 if (pSysMenu != NULL) :i8B'|DN5  
 { 8n`O{8:fi  
  CString strAboutMenu; nJ{vO{N  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 2zQ62t}  
  if (!strAboutMenu.IsEmpty()) hJsYKd8g  
  { "S ~(|G  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,Q>Rt V  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); QW[ gDc  
  } X6`F<H`  
 } \u@*FTS  
 SetIcon(m_hIcon, TRUE); // Set big icon m(6SiV=D9  
 SetIcon(m_hIcon, FALSE); // Set small icon 8kA2.pIk  
 m_Key.SetCurSel(0); hI Q 2s  
 RegisterHotkey(); x;; =+)Gg  
 CMenu* pMenu=GetSystemMenu(FALSE); G+dQ" cI9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); %D9,Femt  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); g(`m#&P>G  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); tITx+i  
 return TRUE; // return TRUE unless you set the focus to a control c@&-c[k^W  
} M!9gOAQP  
/ehmy(zL  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~T{^7"q\  
{ w'/ Mn+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ds*N1[ *  
 { zv^km5by  
  CAboutDlg dlgAbout; Ob+Rnfx37  
  dlgAbout.DoModal(); =u5a'bp0;;  
 } L>&o_bzp  
 else M_+"RKp  
 { ;!ICLkc$  
  CDialog::OnSysCommand(nID, lParam); j`'9;7h M6  
 } !6R;fD#^s  
} nI63Ns  
r\+0J`  
void CCaptureDlg::OnPaint() jc4#k+sb  
{ )nK-39,G  
 if (IsIconic()) DxFmsjX[L  
 { (SEE(G35  
  CPaintDC dc(this); // device context for painting j>{Dbl:#2  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )tq&l>0h  
  // Center icon in client rectangle V+A9.KoI  
  int cxIcon = GetSystemMetrics(SM_CXICON); x'4q`xDa  
  int cyIcon = GetSystemMetrics(SM_CYICON); *v' d1.Z  
  CRect rect; . paA0j  
  GetClientRect(&rect); O7M8!3Eqm  
  int x = (rect.Width() - cxIcon + 1) / 2; *[P"2b#  
  int y = (rect.Height() - cyIcon + 1) / 2; *t)Y@=k3>  
  // Draw the icon pdz_qj!Z  
  dc.DrawIcon(x, y, m_hIcon); b-d{)-G{(  
 } X\ -IAv  
 else 4dEfXrMf  
 { wb#ZRmx}  
  CDialog::OnPaint(); %`M IGi#  
 } %M=Ob k  
} K~C6dy  
qM$4c7'4P6  
HCURSOR CCaptureDlg::OnQueryDragIcon() prWK U  
{ SH009@l_8  
 return (HCURSOR) m_hIcon; z154lY}K  
} #cnh ~O  
ag_RKlM3  
void CCaptureDlg::OnCancel() !R 2;]d*  
{ /S9(rI<'  
 if(bTray) W RBCNra  
  DeleteIcon(); 'P:u/Sq?m  
  CDialog::OnCancel(); R2e":`0I  
} cbton<r~  
@L9C_a  
void CCaptureDlg::OnAbout() ep$C nBwE  
{ c*k%r2'  
 CAboutDlg dlg; "CX@a"  
 dlg.DoModal(); ~l^Q~W-+  
} 9GV1@'<Y]  
-lb,0   
void CCaptureDlg::OnBrowse() ,Vc>'4E-  
{ d :a*;F  
 CString str; =hP7 Hea(N  
 BROWSEINFO bi; PXx:JZsju  
 char name[MAX_PATH]; WLy%| {/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); x @a3STKT  
 bi.hwndOwner=GetSafeHwnd(); x}tg/` .=z  
 bi.pszDisplayName=name; P,eP>55'K  
 bi.lpszTitle="Select folder"; mnG\qsKNLK  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; y37c&XYq  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); lB(E:{6OZ  
 if(idl==NULL) }x9D;%)/  
  return; UG!528;7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); AW R   
 str.ReleaseBuffer(); pnpx`u;  
 m_Path=str; _=\J:r|Y:  
 if(str.GetAt(str.GetLength()-1)!='\\') TpSv7kT]  
  m_Path+="\\"; \se /2l  
 UpdateData(FALSE); >x3$Ld  
} P&=H<^yd  
4%GwCEnS  
void CCaptureDlg::SaveBmp() k vQ] }`a  
{ QyEGK  
 CDC dc; JG:li} N  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); y"L7.B  
 CBitmap bm; Jqp;8DV}  
 int Width=GetSystemMetrics(SM_CXSCREEN); XH`W(  
 int Height=GetSystemMetrics(SM_CYSCREEN); B*3<(eI  
 bm.CreateCompatibleBitmap(&dc,Width,Height); E5+-N  
 CDC tdc; LFskNF0X  
 tdc.CreateCompatibleDC(&dc); Dga;GYx  
 CBitmap*pOld=tdc.SelectObject(&bm); g.wDg  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); GL^84[f-T  
 tdc.SelectObject(pOld); 0zHMtC1 ,  
 BITMAP btm; n90DS/Yx  
 bm.GetBitmap(&btm); wR%F>[ 6.{  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; tYk!Y/O}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); NRI @M5  
 BITMAPINFOHEADER bih; 1Uaj}= @M  
 bih.biBitCount=btm.bmBitsPixel; 579<[[6~d2  
 bih.biClrImportant=0; f =MP1q[  
 bih.biClrUsed=0;  v[+ ]  
 bih.biCompression=0; 4c'F.0^  
 bih.biHeight=btm.bmHeight; hR+\,P#G[  
 bih.biPlanes=1; UID0|+%Y  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7@NV|Idtd  
 bih.biSizeImage=size; |\<L7|hb9  
 bih.biWidth=btm.bmWidth; ]/6i#fTw  
 bih.biXPelsPerMeter=0; (Zz8 ldO  
 bih.biYPelsPerMeter=0; 6BdK)s  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &`%J1[dy  
 static int filecount=0; oB$c-!&  
 CString name; *w`_(X f  
 name.Format("pict%04d.bmp",filecount++); ]k# iA9I  
 name=m_Path+name; rT"3^,,  
 BITMAPFILEHEADER bfh; EGysA{o"X  
 bfh.bfReserved1=bfh.bfReserved2=0; QF4)@ r{2x  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ^iqy|zNtn  
 bfh.bfSize=54+size; { u %xc"0y  
 bfh.bfOffBits=54; Mpx98xcO  
 CFile bf; Mc9JFzp  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ `Fx+HIng,  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <]f{X<ef  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 2Bz\Tsp  
  bf.WriteHuge(lpData,size); 7ND4Booul  
  bf.Close(); ~$jRn(2  
  nCount++; _lBHZJ+  
 } g%_ 3  
 GlobalFreePtr(lpData); }B ?_>0  
 if(nCount==1) y!VL`xV  
  m_Number.Format("%d picture captured.",nCount); \gFV6 H?`  
 else HV=P! v6  
  m_Number.Format("%d pictures captured.",nCount); @+7CfvM  
  UpdateData(FALSE); pCC3r t(  
} GMlJM  
8bdx$,$k  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9T_fq56Oh6  
{ <8ih >s(C  
 if(pMsg -> message == WM_KEYDOWN) T,9pd;k  
 { DEW;0ic  
  if(pMsg -> wParam == VK_ESCAPE) GmH`ipi  
   return TRUE; UCo`l~K)qg  
  if(pMsg -> wParam == VK_RETURN) $/crb8-C  
   return TRUE; Z.b?Jzj  
 } ny}_^3  
 return CDialog::PreTranslateMessage(pMsg); }t*:EgfI  
} [ D"5@  
}ag;yf;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~t<uX "K  
{ a Z8f>t1Q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ k'NP+N<M  
  SaveBmp(); ~U4Cf >  
  return FALSE; D `av9I  
} %6la@i  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <m,bP c :R  
 CMenu pop; xYY^tZIV  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8p#V4liE  
 CMenu*pMenu=pop.GetSubMenu(0); L]q%;u]8!  
 pMenu->SetDefaultItem(ID_EXITICON); b!qlucA eE  
 CPoint pt; kP1cwmZ7F  
 GetCursorPos(&pt); <tW/9}@p9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Y?- "HK:  
 if(id==ID_EXITICON) aTkMg  
  DeleteIcon(); ,<$rSvMfg  
 else if(id==ID_EXIT) -EE}HUP)  
  OnCancel(); N|%X/UjZ2.  
 return FALSE; :1;"{=Yx}  
} Rm}G4Pq  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "5v^6R9e  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) H`,t"I  
 AddIcon(); T%A"E,#  
 return res; >`<qa!9  
} n(.L=VuXn  
)6%a9&~H  
void CCaptureDlg::AddIcon() mnx`e>0  
{ o*3\xg  
 NOTIFYICONDATA data; \}AJ)v*<  
 data.cbSize=sizeof(NOTIFYICONDATA); $RYOj{1  
 CString tip; %~M#3Ywa  
 tip.LoadString(IDS_ICONTIP); & x$ps  
 data.hIcon=GetIcon(0); (wvU;u  
 data.hWnd=GetSafeHwnd(); `NNP}O2  
 strcpy(data.szTip,tip); 1Beh&pl^  
 data.uCallbackMessage=IDM_SHELL; 6n;? :./  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; CdMV(  
 data.uID=98; |E;+j\   
 Shell_NotifyIcon(NIM_ADD,&data); cYBjsN(!A|  
 ShowWindow(SW_HIDE); Lt i2KY}/%  
 bTray=TRUE; `~\8fN  
} v5&W)F  
E,fbIyX  
void CCaptureDlg::DeleteIcon() i(*fv(z  
{ +:W?:\  
 NOTIFYICONDATA data; .HRd6O;  
 data.cbSize=sizeof(NOTIFYICONDATA); Htfq?\ FD  
 data.hWnd=GetSafeHwnd(); 5=Y(.}6  
 data.uID=98; /B|"<`-H  
 Shell_NotifyIcon(NIM_DELETE,&data); &*oljGt8  
 ShowWindow(SW_SHOW); ":qS9vW  
 SetForegroundWindow(); 9< S  
 ShowWindow(SW_SHOWNORMAL); jUDE)~h  
 bTray=FALSE; c~}FYO$  
} D[6wMep^n  
Qz"//=hC|H  
void CCaptureDlg::OnChange() m>?|*a,  
{ l<'}`  
 RegisterHotkey(); F~~9/#  
} PnL?zae  
_ q AT%.  
BOOL CCaptureDlg::RegisterHotkey() O&}R  
{ HGi%b5:<=M  
 UpdateData(); cVYu(ssC4  
 UCHAR mask=0; jo<Gf 5  
 UCHAR key=0; eLbh1L  
 if(m_bControl) vl?fCO  
  mask|=4; .?b2Bd!MC  
 if(m_bAlt)  $3](6  
  mask|=2; 0;'kv |  
 if(m_bShift) | ]`gps  
  mask|=1; ^=Rqa \;  
  key=Key_Table[m_Key.GetCurSel()]; c_xtwdkL9  
 if(bRegistered){ juuBLv  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); E)|_7x<u  
  bRegistered=FALSE; h d1H  
 } mg)lr&-b  
 cMask=mask; yEt:g0Z \  
 cKey=key; D3yG@lIP3  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ZjLzS]\a  
 return bRegistered; ^GdU$%aa  
} MP,l*wVd  
/=4P< &J  
  四、小结 p2|c8n==  
+=%13cA*U  
  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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