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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: ;dXQB>Za  
  8m? 9?OV5  
  一、实现方法 eK_Q>;k5A  
|e+8Xz1>  
  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: S`,(10Y  
~ Iin|  
#pragma data_seg("shareddata") J;Y=o B  
HHOOK hHook =NULL; //钩子句柄 H(qDQqJHYy  
UINT nHookCount =0; //挂接的程序数目 W<Ms0  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7:fC,2+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 0bY}<x(;  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5xJyW`SWz  
static int KeyCount =0; ` VL`8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 /S}0u}jID?  
#pragma data_seg() wps`2`z  
1.7tXjRd+  
  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。 T KpX]H`  
^,@!L-<~(b  
  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: SM>V o+  
 _N`:NOM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR j3j<01rq  
cKey,UCHAR cMask) #=)(t${7'  
{ 4] c.mDo[T  
 BOOL bAdded=FALSE; =-#>NlB$w  
 for(int index=0;index<MAX_KEY;index++){ JZ#O"rF  
  if(hCallWnd[index]==0){ o *5<Cxg  
   hCallWnd[index]=hWnd; _D%aT6,G+(  
   HotKey[index]=cKey; KA)9&6  
   HotKeyMask[index]=cMask; =nQ"ye  
   bAdded=TRUE; }6#lE,\lM  
   KeyCount++; 5<o8prt B  
   break; bn`1JI@S4  
  } >Mml+4<5  
 } F,2)Udim  
 return bAdded; C'bW3la  
} YGp8./ma<I  
//删除热键 {J`Zl1_q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wwnl_9a  
{ [kf$8 2  
 BOOL bRemoved=FALSE; F@e9Dz|  
 for(int index=0;index<MAX_KEY;index++){ ~T;FOB%w  
  if(hCallWnd[index]==hWnd){ sSVgDQ~q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yya"*]*S  
    hCallWnd[index]=NULL; <uGc=Du  
    HotKey[index]=0; asT*Z"/Q!  
    HotKeyMask[index]=0; _M n7zt1^  
    bRemoved=TRUE; 9}e`_z  
    KeyCount--; w7Do#Cv  
    break; =rBNEd  
   } ByR%2_6&  
  } 20[_eu)  
 } Nh7D&#z  
 return bRemoved; 8v&4eU'S  
} \B _g=K  
JA!O,4  
6?-vj2,  
  DLL中的钩子函数如下: $~M#msK9  
c"X`OB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^l\U6$3  
{ &WW|! 6  
 BOOL bProcessed=FALSE; '1?b?nVo  
 if(HC_ACTION==nCode) cx?XJ)  
 { '~?\NeO=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 32[lsU>1  
   switch(wParam) zyNg?_SM  
   {  N*.JQvbnr  
    case VK_MENU: c}9.Or`?  
     MaskBits&=~ALTBIT; YGVj$\  
     break; NP%Y\%;l6  
    case VK_CONTROL: 3nVdws  
     MaskBits&=~CTRLBIT; 96fzSZS,  
     break; r|rOIAo  
    case VK_SHIFT: qaK9E@l  
     MaskBits&=~SHIFTBIT; BU|=`Kb|))  
     break; C[h"w'A2  
    default: //judge the key and send message (<f`}, QxD  
     break; Y`@:L'j  
   } Wi3:;`>G<p  
   for(int index=0;index<MAX_KEY;index++){ Gi})*U]P|  
    if(hCallWnd[index]==NULL) %X(iAoxbj  
     continue; 8,0p14I5;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (8C ,"Dc[0  
    { c8qsp n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p|Po##E}g^  
     bProcessed=TRUE; =5bef8O  
    } FX QUj&9  
   } _~f&wkc  
  } %u"3&kOV  
  else if((lParam&0xc000ffff)==1){ //有键按下 3D3/\E#'o  
   switch(wParam) w i,}sEoM  
   { yyZV/ x~  
    case VK_MENU: -3 .Sr|t  
     MaskBits|=ALTBIT; -eH5s3:A  
     break; \W5fcxf  
    case VK_CONTROL: OZ2gIK  
     MaskBits|=CTRLBIT; n_[;2XQQ  
     break; }?zy*yL  
    case VK_SHIFT: 0Da9,&D  
     MaskBits|=SHIFTBIT; HIUB:  
     break; 4(5NHsvp  
    default: //judge the key and send message *n $=2v^A  
     break; 2"`R_q  
   } \XaKq8uE  
   for(int index=0;index<MAX_KEY;index++){ qKX3Npw  
    if(hCallWnd[index]==NULL) &)?ECj0`  
     continue; -ea":}/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EHByo[  
    { HyKvDJ 3_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "F nH>g-  
     bProcessed=TRUE; }G,PUjg_^3  
    } sJ{S(wpi"  
   } <d".v  
  } fi*@m,-  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 nCF1i2*6|"  
   for(int index=0;index<MAX_KEY;index++){ 37Z@a!#  
    if(hCallWnd[index]==NULL) zS]8ma  
     continue; "8{#R*p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9sQ7wlK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); DEj6 ky  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 L1'R6W~%dN  
   } M`6rI  
  } ~I'1\1  
 } < {1'cx  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9F[k;Uw  
} JDi\?m d.  
_.b^4^[  
  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: u-yVc*<,  
R(jp  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b^WTX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hfUN~89;  
/DxaKZ ;b  
  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: Uy  $1X  
MM_c{gFF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fO6i  
{ Pc"g  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) - \ {.]KL  
 { s];jroW@u  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 cj=6_k  
  SaveBmp(); |$AoI  
  return FALSE; 6Z2a5zO8  
 } ]iP  +Y  
 …… //其它处理及默认处理 v#yeiE4  
} "Dr8}g:X  
S6~&g|T,  
OsQB` D  
  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[M`LZpJo  
 R d|#-7  
  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。 KmUH([#  
6|h~pH  
  二、编程步骤 46 p%y  
2`2S94'  
  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"; ;3~+M:{2  
m-%.LDqM  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; IrIF 853g  
fa~4+jx>S  
  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; U]!~C 1cmw  
,E YB E  
  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; v[P $c$Xi  
Pra,r9h,  
  5、 添加代码,编译运行程序。 3<c_`BWu  
)#|I(Gz ^  
三、程序代码 NR </Jm*  
=t,}I\_^c  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL C"X; ,F<  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Cp[{| U-?G  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ JerueF;J  
#if _MSC_VER > 1000 ((Jiv=%  
#pragma once ) ?L  
#endif // _MSC_VER > 1000 H Pvs~`>V  
#ifndef __AFXWIN_H__ ;gE]*Y.Z.p  
#error include 'stdafx.h' before including this file for PCH ak_&\'P  
#endif x^0MEsR  
#include "resource.h" // main symbols rV *`0hA1  
class CHookApp : public CWinApp 9^D5Sl$g  
{ Wzm!:U2R*  
 public: o \r6 iO  
  CHookApp(); ^)\z  
  // Overrides S.i CkX  
  // ClassWizard generated virtual function overrides %yr(i 6L  
  //{{AFX_VIRTUAL(CHookApp) 3b9SyU2  
 public: h3.6<vM  
  virtual BOOL InitInstance(); 57nSyd] PR  
  virtual int ExitInstance(); Y*}xD;c k  
  //}}AFX_VIRTUAL tN-U,6c]  
  //{{AFX_MSG(CHookApp) VB(S]N)F^  
  // NOTE - the ClassWizard will add and remove member functions here. BH@b]bEJ  
  // DO NOT EDIT what you see in these blocks of generated code ! Hu4\4x$?  
  //}}AFX_MSG oQsls9t  
  DECLARE_MESSAGE_MAP() 'h]sq {  
}; !:zWhu,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); i'6>_,\(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p`oSI}ZwB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r]6X  
BOOL InitHotkey(); ;";#{B:  
BOOL UnInit(); Ug2^cgL  
#endif ?G|*=-8  
qFV }Y0w  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `XmT)C  
#include "stdafx.h" T/9`VB%N  
#include "hook.h" &O&;v|!9  
#include <windowsx.h> G]NnGL<xk  
#ifdef _DEBUG sTmY'5ry  
#define new DEBUG_NEW /E%r@Rui3$  
#undef THIS_FILE 948lL&  
static char THIS_FILE[] = __FILE__; .66_g@1  
#endif O|ODJOQNol  
#define MAX_KEY 100 E;*JD x  
#define CTRLBIT 0x04 7QnQ=gu  
#define ALTBIT 0x02  *|OP>N  
#define SHIFTBIT 0x01 /kK%}L_D  
#pragma data_seg("shareddata") 3 $~6+i  
HHOOK hHook =NULL; C VyYV &U,  
UINT nHookCount =0; q8Z,XfF^S  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ..Dr?#Cr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3M@!?=| U  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey v&#=1Zb  
static int KeyCount =0; 1G6 %?Iph  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Ok/U"N-  
#pragma data_seg() M@ TXzn!&o  
HINSTANCE hins; et-<ib<lY  
void VerifyWindow(); $>Mqo  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \NgBF  
//{{AFX_MSG_MAP(CHookApp) &IZthJqV  
// NOTE - the ClassWizard will add and remove mapping macros here. GM{J3O=  
// DO NOT EDIT what you see in these blocks of generated code! FxK2 1  
//}}AFX_MSG_MAP D on8xk  
END_MESSAGE_MAP() >sfH[b  
zfexaf!  
CHookApp::CHookApp() @xBw'  
{ M~o\K'  
 // TODO: add construction code here, =xf7lN'  
 // Place all significant initialization in InitInstance i!tF{'*%#  
} JiXkW%  
*  11|P  
CHookApp theApp; xklXV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) P.j0Xlof  
{ `3QAXDWE  
 BOOL bProcessed=FALSE; Y +[Z,   
 if(HC_ACTION==nCode) L)mb.U$`c|  
 { #JLxM/5^1~  
  if((lParam&0xc0000000)==0xc0000000){// Key up A/xo'G  
   switch(wParam) F:vHbs `y  
   { {&qB!axj  
    case VK_MENU: l7p*: :(9  
     MaskBits&=~ALTBIT; !(&N{NH9  
     break; '9w.~@7  
    case VK_CONTROL: kr=&x)Wy!  
     MaskBits&=~CTRLBIT; gPA), NrN  
     break; rNl` w.  
    case VK_SHIFT: :SUU)jLq  
     MaskBits&=~SHIFTBIT; p1mY@  
     break; ~AX@o-WU  
    default: //judge the key and send message >axf_k  
     break; Qgel^"t]i  
   } X-mhz3Q&a  
   for(int index=0;index<MAX_KEY;index++){ 3WTNWz#h  
    if(hCallWnd[index]==NULL) {,Py%.vvR  
     continue; MU-T>S4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j)vfI>  
    { 6Z,j^: B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5|pPzEA>  
     bProcessed=TRUE; a-9Y &#U  
    } <"SOH; w  
   } u*:;O\6l  
  } L6jD4ec8  
  else if((lParam&0xc000ffff)==1){ //Key down n$}) }kj  
   switch(wParam) tu%!j}3s  
   { $ M8ZF(W  
    case VK_MENU: 8rXQK|A  
     MaskBits|=ALTBIT; @h91: hb  
     break; 4XCy>;4u  
    case VK_CONTROL: yH:gFEJ:x  
     MaskBits|=CTRLBIT; QsN%a>t  
     break; ov@N13 ,$  
    case VK_SHIFT: Sj`GP p  
     MaskBits|=SHIFTBIT; ;n"Nv }<C  
     break; $7~T+fmF  
    default: //judge the key and send message ! ,*4d $  
     break; 2/coa+Qkv]  
   } (n>gC  
   for(int index=0;index<MAX_KEY;index++) F6vN{ FI  
   { C@$!'^ 61  
    if(hCallWnd[index]==NULL) z;F6:aBa  
     continue; 8=!BtMd"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lJR  
    { T`?{Is['(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); a7_&;  
     bProcessed=TRUE; ZtFOIb*  
    } <Y9 L3O`[  
   } L+rMBa  
  } Z WVN(U  
  if(!bProcessed){ (8$; 4q[!  
   for(int index=0;index<MAX_KEY;index++){ a#_=c>h;  
    if(hCallWnd[index]==NULL) 4)zHkN+  
     continue; HLa3lUo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~%8T_R/3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2^*a$ OJ  
   } &.ENcEic  
  } {okx*]PIc  
 } qVpV ZH!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F"?OLV1B&  
} @S%ogZz*m  
ZjEc\{ s  
BOOL InitHotkey() uq~Z  
{ Vp5i i]B4  
 if(hHook!=NULL){ tt=JvI9>  
  nHookCount++; j-% vLL/  
  return TRUE; n& j@7R  
 } O8\dMb  
 else =jWcD{;1I}  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 63EwV p/|  
  if(hHook!=NULL) - %5O:n  
   nHookCount++; 9 K.B  
  return (hHook!=NULL); !T<4em8  
} U<aT%^_  
BOOL UnInit() Rx}*I00  
{ B]""%&! O  
 if(nHookCount>1){ )fRZ}7k:  
  nHookCount--; aT[qJbp1  
  return TRUE; -!~ T$}/F  
 } 2^\67@9  
 BOOL unhooked = UnhookWindowsHookEx(hHook); t04_~e  
 if(unhooked==TRUE){ 6~t;&)6J  
  nHookCount=0; M$O*@])  
  hHook=NULL; R'#1|eWCa  
 } cU+% zk  
 return unhooked; iFypKpHg~  
} \bc ob8u  
PU"C('AP  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bGO[P<<  
{ 6BnP"R.  
 BOOL bAdded=FALSE; [#}0)  
 for(int index=0;index<MAX_KEY;index++){ G1vg2'A  
  if(hCallWnd[index]==0){ FM80F_G^z  
   hCallWnd[index]=hWnd; [X"F}ph  
   HotKey[index]=cKey; feI%QnK)U  
   HotKeyMask[index]=cMask; TH%J=1d  
   bAdded=TRUE; fs:%L  
   KeyCount++; \9Z1'W  
   break; pr;z>|FgA>  
  } &N`s@Ka  
 } a___SYl 'K  
 return bAdded; \fk%^1XY  
} 91Fx0(  
;E!(W=]*F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >l!#_a  
{ ++HHUM  
 BOOL bRemoved=FALSE; \Y4>_Mk  
 for(int index=0;index<MAX_KEY;index++){ yqY nd<K4  
  if(hCallWnd[index]==hWnd){ b `7vWyp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ wOlnDQs  
    hCallWnd[index]=NULL; EINjI:/D  
    HotKey[index]=0; GmONhh(k  
    HotKeyMask[index]=0; #DqVh!t"  
    bRemoved=TRUE; +J`HI1  
    KeyCount--; 0|D^_1W`R  
    break; tJ_6dH8Y  
   } <hS %I  
  } +bGj(T%+'  
 } G~ldU: ?  
 return bRemoved; @lYm2l^  
} h8ikM&fl  
Y%i=u:}fm  
void VerifyWindow() ;`{PA !>  
{ %/K'VE6pb  
 for(int i=0;i<MAX_KEY;i++){ fW'@+<b  
  if(hCallWnd!=NULL){ /|)VO?*D  
   if(!IsWindow(hCallWnd)){ Ji#"PE/Pt  
    hCallWnd=NULL; \h#,qTE  
    HotKey=0; XVlZ:kz  
    HotKeyMask=0; }:b6WN;c  
    KeyCount--; )}G?^rDH(  
   } v4pFts$J  
  } <#[_S$54  
 } 6c?;-5.  
} U:a-Wi+  
5*q!:$ W  
BOOL CHookApp::InitInstance() _>6xU t  
{ sp/l-a  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^"U-\cx  
 hins=AfxGetInstanceHandle(); `Wes!>Vh!  
 InitHotkey(); wU9H=w^  
 return CWinApp::InitInstance(); lJ'. 1Z&  
} Q?Y\WD  
+5zLQ>]z  
int CHookApp::ExitInstance() nO ^m  
{ R.Plfm06Ue  
 VerifyWindow(); <3 b|Sk:T  
 UnInit(); =&5^[:ksB  
 return CWinApp::ExitInstance(); |qn`z-  
} aZk/\&=6  
&pL.hM^  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file :75$e%'A  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gH0' Ok'  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7lC );  
#if _MSC_VER > 1000 )r9l T*z  
#pragma once \hm;p  
#endif // _MSC_VER > 1000 ']bpsn  
!zu YO3:  
class CCaptureDlg : public CDialog s!vvAD;\  
{ \NiW(!Z}  
 // Construction  ?^8CD.|  
 public: xb N)z  
  BOOL bTray; SRUg2)d  
  BOOL bRegistered; :jJ;&t^^  
  BOOL RegisterHotkey(); #[Z1W8e  
  UCHAR cKey; (P+TOu-y\  
  UCHAR cMask; sQ)D.9\~  
  void DeleteIcon(); j o7`DDb  
  void AddIcon(); ;2NJkn9t  
  UINT nCount; nB~hmE)  
  void SaveBmp(); ZQ%4]=w  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor #|ppW fZQ  
  // Dialog Data <l:c O$ m  
  //{{AFX_DATA(CCaptureDlg) (O&R-5m  
  enum { IDD = IDD_CAPTURE_DIALOG }; s>RtCw3,  
  CComboBox m_Key; ]uikE2nn  
  BOOL m_bControl; jHU5>Gt-}  
  BOOL m_bAlt; ja<!_^h=At  
  BOOL m_bShift; 5i<E AKL  
  CString m_Path; p#]D-?CM)  
  CString m_Number; E`"<t:RzF  
  //}}AFX_DATA 8)NQt$lWp  
  // ClassWizard generated virtual function overrides hS( )OY  
  //{{AFX_VIRTUAL(CCaptureDlg) H}nPaw]G  
 public: F+c4v A})  
  virtual BOOL PreTranslateMessage(MSG* pMsg); H*gX90{!2  
 protected:  3ih3O  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8zOoVO  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &B3[:nS2  
  //}}AFX_VIRTUAL ( <Abw{BTm  
  // Implementation <hJ%]]  
 protected: _ $ Wj1h  
  HICON m_hIcon; (i 3=XfZ!C  
  // Generated message map functions fcim4dfP  
  //{{AFX_MSG(CCaptureDlg) >dr34=(  
  virtual BOOL OnInitDialog(); r Ljb'\<*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0LjF$3GpZ  
  afx_msg void OnPaint(); g }%$VUSA  
  afx_msg HCURSOR OnQueryDragIcon(); nn1T5;  
  virtual void OnCancel(); bm</qF'T6  
  afx_msg void OnAbout(); VV$$t;R/  
  afx_msg void OnBrowse(); nx2iEXsa  
  afx_msg void OnChange(); vFz#A/1  
 //}}AFX_MSG /OX;3" +1  
 DECLARE_MESSAGE_MAP() vC# *w,  
}; PsV1btq]  
#endif y{ ?wxg9  
|5;:3K+  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file bXx2]E227  
#include "stdafx.h" Y`U[Y Hx  
#include "Capture.h" $*KM%M6  
#include "CaptureDlg.h" daX$=n  
#include <windowsx.h> bg =<)s  
#pragma comment(lib,"hook.lib") PQ#zF&gL9t  
#ifdef _DEBUG vi4lmkyh^  
#define new DEBUG_NEW zL%ruWNG  
#undef THIS_FILE MYmH?A  
static char THIS_FILE[] = __FILE__; LdPA`oI3j  
#endif 5Nt40)E}sN  
#define IDM_SHELL WM_USER+1 7V="/0a  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6AA "JX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?}n\&|+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 19g-#H!  
class CAboutDlg : public CDialog %VSjMZ  
{ q[wVC h  
 public: c9 &LK J6  
  CAboutDlg(); b: c$EPK  
  // Dialog Data _wY <8 F*  
  //{{AFX_DATA(CAboutDlg) >k)zd-  
  enum { IDD = IDD_ABOUTBOX }; fx"~WeVcO  
  //}}AFX_DATA kw M1f=!-  
  // ClassWizard generated virtual function overrides W/\M9  
  //{{AFX_VIRTUAL(CAboutDlg) Jn+k$'6 %#  
 protected: -J`VXG:M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  t=6[FK  
  //}}AFX_VIRTUAL KkCA*GS  
  // Implementation T2%{pcdV/  
 protected: fbjT"jSzw  
  //{{AFX_MSG(CAboutDlg)  av!'UZP  
  //}}AFX_MSG N!TC}#}l  
  DECLARE_MESSAGE_MAP() gQ0W>\xz  
}; O 8\wH  
_[kZ:#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $3BH82  
{ 1B5 ]1&M  
 //{{AFX_DATA_INIT(CAboutDlg) zG|#__=T  
 //}}AFX_DATA_INIT 0&W*U{0F\  
} e*Y>+*2y  
)M: pg%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) zDD1EycH  
{ F.DR Gi.i  
 CDialog::DoDataExchange(pDX); }[2|86,G;  
 //{{AFX_DATA_MAP(CAboutDlg) /&eF,4  
 //}}AFX_DATA_MAP v=Y) A?  
} ,5 A&  
(v2.8zrJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) U~}cib5W5  
 //{{AFX_MSG_MAP(CAboutDlg) #A@d;U%  
 // No message handlers PIthv [F  
 //}}AFX_MSG_MAP vr$zYdV>  
END_MESSAGE_MAP() M#5*gWfq9  
`Cv@16  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) p?#%G`dm  
: CDialog(CCaptureDlg::IDD, pParent)  z^YL$  
{ ,xzSFs>2  
 //{{AFX_DATA_INIT(CCaptureDlg) 8#_"WzDw  
  m_bControl = FALSE; A $GiO  
  m_bAlt = FALSE; -:jC.} Y  
  m_bShift = FALSE; 8K;wX%_,  
  m_Path = _T("c:\\"); )Z.M(P  
  m_Number = _T("0 picture captured."); g:&V9~FR  
  nCount=0; Cr;d !=  
  bRegistered=FALSE; 8A,="YIt  
  bTray=FALSE; x$WdW+glZ-  
 //}}AFX_DATA_INIT l`' lqnhv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /iwL$xQQ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -|/kg7IO\  
} NA<6s]Cs.  
% njcWVP;  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "{X_[  
{ d=$1Z. ]  
 CDialog::DoDataExchange(pDX); 'y<<ce*   
 //{{AFX_DATA_MAP(CCaptureDlg) 3v:c".O2O  
  DDX_Control(pDX, IDC_KEY, m_Key); J_tI]?jrU  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); l4LowV7  
  DDX_Check(pDX, IDC_ALT, m_bAlt); U*R  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uTq)Ets3  
  DDX_Text(pDX, IDC_PATH, m_Path); &l| :1  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ->0OqVQA  
 //}}AFX_DATA_MAP Ozo)}  
} n~e#Y<IP\1  
:{tj5P!S  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) g 218%i  
//{{AFX_MSG_MAP(CCaptureDlg) BGSqfr1F  
 ON_WM_SYSCOMMAND() 8ba*:sb  
 ON_WM_PAINT() (+=TKI<=  
 ON_WM_QUERYDRAGICON() MV,;l94?%=  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 8>(DQ"h  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ~p'DPg4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) y~jYGN  
//}}AFX_MSG_MAP e|~s'{3  
END_MESSAGE_MAP() J ;e/S6l  
gL-\@4\wc  
BOOL CCaptureDlg::OnInitDialog() d O'apey  
{ ; ^cc-bLvF  
 CDialog::OnInitDialog(); =w/S{yC  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %x5zs ]4^  
 ASSERT(IDM_ABOUTBOX < 0xF000); [ ]LiL;A&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ROfr  
 if (pSysMenu != NULL) ,2y " \_  
 { UB7H`)C}  
  CString strAboutMenu; j%Cr)' H?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Z?o?"|o  
  if (!strAboutMenu.IsEmpty()) c~=yD:$  
  { 0s%rd>3  
   pSysMenu->AppendMenu(MF_SEPARATOR); }F;Nh7?  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); G._E9  
  } 4\?GA`@  
 } C $r]]MSj  
 SetIcon(m_hIcon, TRUE); // Set big icon Om/mpU/U  
 SetIcon(m_hIcon, FALSE); // Set small icon cYaf QyU  
 m_Key.SetCurSel(0); 61}hB>TT:  
 RegisterHotkey(); (wtw1E5X  
 CMenu* pMenu=GetSystemMenu(FALSE); ^9zFAY.|  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); faJ>,^V#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); N!hS`<}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); G;CB%qXI  
 return TRUE; // return TRUE unless you set the focus to a control F]"Hs>  
} lbg^ 2|o~~  
V.8pxD5 s  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) mn;Wqb/  
{ &\_cU?0d  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ?7:?OX  
 { 8pQ:B/3=  
  CAboutDlg dlgAbout; _H (:$=$Q  
  dlgAbout.DoModal(); @jp}WwC/  
 } eK]$8l|LI  
 else IUJRP  
 { fsxZQ=-PW  
  CDialog::OnSysCommand(nID, lParam); bR*/d-v^  
 } jRv j:H9  
} nYv`{0S+m  
Oy `2ccQ#  
void CCaptureDlg::OnPaint() (fYrb# ]!y  
{ oF(<}0Z  
 if (IsIconic()) 1D pRm(  
 { t'F_1P^*/  
  CPaintDC dc(this); // device context for painting Wxxnc#;lv  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?[ts<Ltp  
  // Center icon in client rectangle 1~x=bphS  
  int cxIcon = GetSystemMetrics(SM_CXICON); JnT1-=t.  
  int cyIcon = GetSystemMetrics(SM_CYICON); 52L* :|b  
  CRect rect; (6WSQqp  
  GetClientRect(&rect); 5 1\N+  
  int x = (rect.Width() - cxIcon + 1) / 2; ]("5O V5  
  int y = (rect.Height() - cyIcon + 1) / 2; wv~?<DF  
  // Draw the icon yye( ^  
  dc.DrawIcon(x, y, m_hIcon); W,[b:[~v  
 } B9-Nb 4  
 else )^ky @V  
 { Js7D>GWP!  
  CDialog::OnPaint(); h{sY5d'D  
 } LE" t'R   
} Y.<&phv  
p^s k?E  
HCURSOR CCaptureDlg::OnQueryDragIcon() )L%i"=<Bdy  
{ \AT]$`8@_  
 return (HCURSOR) m_hIcon; fy(i<L Z  
} nOd'$q  
DsY$  
void CCaptureDlg::OnCancel() #n[1%8l,  
{ Yp_R+a^  
 if(bTray) 9b0M'x'W5  
  DeleteIcon(); M_4:~&N$  
  CDialog::OnCancel(); d/Z258  
} U;_b4S:  
,3zF_y(*Y  
void CCaptureDlg::OnAbout() A/xWe  
{ OEkx}.w  
 CAboutDlg dlg; "?lm`3W"  
 dlg.DoModal(); *FwHZZ~U  
} LQnkpy3A  
PKx ewd  
void CCaptureDlg::OnBrowse() 3gn) q>Xj$  
{ gyI(O>e  
 CString str; B3P#p^  
 BROWSEINFO bi; LE|*Je3a  
 char name[MAX_PATH]; a s{^~8B  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 1xJc[q  
 bi.hwndOwner=GetSafeHwnd(); \I"UW1)B  
 bi.pszDisplayName=name; O@ GEl  
 bi.lpszTitle="Select folder"; ]vPa A  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Au6*hv3:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4[S0~O{r  
 if(idl==NULL) WG{mg/\2(C  
  return; ]J t8]w  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 4<['%7U_[  
 str.ReleaseBuffer(); yvgn}F{}  
 m_Path=str; jQKlJi2xu  
 if(str.GetAt(str.GetLength()-1)!='\\') M# sDPT  
  m_Path+="\\"; o*_O1P  
 UpdateData(FALSE); CZ/bO#~  
} S[b)`Wi D  
9Q#eu~R  
void CCaptureDlg::SaveBmp() 6!,Am^uXM  
{ JYbE(&l%de  
 CDC dc; 0RLyAC|  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Rv)!p~V8  
 CBitmap bm; 3q>6gaTv  
 int Width=GetSystemMetrics(SM_CXSCREEN); "rjqDpH  
 int Height=GetSystemMetrics(SM_CYSCREEN); %r<c>sFJN  
 bm.CreateCompatibleBitmap(&dc,Width,Height); [Z5Lgg&  
 CDC tdc; hm%'k~  
 tdc.CreateCompatibleDC(&dc); 2>.2H  
 CBitmap*pOld=tdc.SelectObject(&bm); p<|I!n&9  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); a:o Z5PX=  
 tdc.SelectObject(pOld); Sv7_-#SW<(  
 BITMAP btm; QL>G-Rp  
 bm.GetBitmap(&btm); _)7dy2%{q  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;BEg"cm  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); m\h/D7zg  
 BITMAPINFOHEADER bih; xb!h?F&  
 bih.biBitCount=btm.bmBitsPixel; r|XNS>V ,$  
 bih.biClrImportant=0; <bwsK,C  
 bih.biClrUsed=0; ? [?{X~uq  
 bih.biCompression=0; yn0OPjH  
 bih.biHeight=btm.bmHeight; eB:OvOol*^  
 bih.biPlanes=1; wo>srZs  
 bih.biSize=sizeof(BITMAPINFOHEADER); EBY=ccGE{  
 bih.biSizeImage=size; !OJ@ =y`i  
 bih.biWidth=btm.bmWidth; ,t+5(qi  
 bih.biXPelsPerMeter=0; 3gW4\2|T  
 bih.biYPelsPerMeter=0; K)Nbl^6x  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); v5|X=B>&>  
 static int filecount=0; y@;4F n/  
 CString name; oh '\,zpL  
 name.Format("pict%04d.bmp",filecount++); 1Ftl1uf  
 name=m_Path+name; c3gy{:lb  
 BITMAPFILEHEADER bfh; M-!eL<  
 bfh.bfReserved1=bfh.bfReserved2=0; y(K?mtQ   
 bfh.bfType=((WORD)('M'<< 8)|'B'); !@ml^&hP  
 bfh.bfSize=54+size; a2dlz@)J  
 bfh.bfOffBits=54; SWjOJjn  
 CFile bf; OQ$77]XtvL  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Jlw oSe:S  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); wX6VapFboI  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); qAsZ,ik  
  bf.WriteHuge(lpData,size); v^aARIg  
  bf.Close(); l-yQ3/:  
  nCount++; Ns-cT'1-  
 } rsP3?.E  
 GlobalFreePtr(lpData); @L%9NqE`O  
 if(nCount==1) TxhTK5#f  
  m_Number.Format("%d picture captured.",nCount); BJ3st  
 else 29K09 0f  
  m_Number.Format("%d pictures captured.",nCount); D?rQQxb  
  UpdateData(FALSE); #&G^%1!  
} IKM=Q. 7j  
ui4H(A'}  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :\Z;FA@g(g  
{ .`!|^h%0  
 if(pMsg -> message == WM_KEYDOWN) C#X0Cn0ln  
 { A2z%zMlZc  
  if(pMsg -> wParam == VK_ESCAPE) b|T}mn  
   return TRUE; ;l_%;O5  
  if(pMsg -> wParam == VK_RETURN) Z8$@}|jN  
   return TRUE; "Hmo`EB0  
 } NDhHU#Q9  
 return CDialog::PreTranslateMessage(pMsg); WigC'  
} >JFAE5tj&2  
^f{+p*i}:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) tvptaw A.  
{ XljiK8q;%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ rUkiwqr~E  
  SaveBmp(); Y%$57,Bu n  
  return FALSE; WlVC0&  
} wO!k|7:Z  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ AigL:4[  
 CMenu pop; $|!VP'VI  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); fmH$ 1C<  
 CMenu*pMenu=pop.GetSubMenu(0); !!ZNemXct$  
 pMenu->SetDefaultItem(ID_EXITICON); KIdlndGs  
 CPoint pt; 6Flc4L8JU  
 GetCursorPos(&pt); h"KN)xi$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); hq/k}Y  
 if(id==ID_EXITICON) 6hSj)  
  DeleteIcon(); F;jl0)fBR=  
 else if(id==ID_EXIT) n{pS+u z  
  OnCancel(); ~130"WQ;  
 return FALSE; !3K6ew>Sf  
} O qDLb  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); x+(h#+F  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Z>Nr"7k  
 AddIcon(); $%VFk53I  
 return res; y";{k+  
} pi? q<p%  
OWCd$c_(  
void CCaptureDlg::AddIcon() %FGPsHH  
{ F ]\4<  
 NOTIFYICONDATA data; .eW}@1+[;  
 data.cbSize=sizeof(NOTIFYICONDATA); ecA[  
 CString tip; FsZF>vaV  
 tip.LoadString(IDS_ICONTIP); G*e/Ft.wf8  
 data.hIcon=GetIcon(0); `9eE139V='  
 data.hWnd=GetSafeHwnd(); \1f$]oS  
 strcpy(data.szTip,tip); .l5y !?  
 data.uCallbackMessage=IDM_SHELL;  %"j<`  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; aYe,5dK>  
 data.uID=98; pL>Q'{7s3  
 Shell_NotifyIcon(NIM_ADD,&data); ,;C92XY  
 ShowWindow(SW_HIDE); y}ez js  
 bTray=TRUE; E0}`+x  
} <FmrYwt  
=-{+y(<"r  
void CCaptureDlg::DeleteIcon() GAbX.9[V  
{ v')Fq[H  
 NOTIFYICONDATA data; t#oY|G3O}  
 data.cbSize=sizeof(NOTIFYICONDATA); $k*E^~qT  
 data.hWnd=GetSafeHwnd(); !l@IG C  
 data.uID=98; {) 4D1  
 Shell_NotifyIcon(NIM_DELETE,&data); :{%6< j  
 ShowWindow(SW_SHOW); O'U0Y8HN  
 SetForegroundWindow(); MuYr?1<q  
 ShowWindow(SW_SHOWNORMAL); #"%oz^~\  
 bTray=FALSE; `N}<lg(0#  
} e{Pgz0sO Q  
L.lmbxn  
void CCaptureDlg::OnChange() R3wK@D  
{ X!,P] G  
 RegisterHotkey(); 0U ?1Yh7 m  
} mkTf}[O  
(w?@qs!  
BOOL CCaptureDlg::RegisterHotkey() ^~|P[}  
{ _;$VH4(BI  
 UpdateData(); +60zJ 4  
 UCHAR mask=0; &fq-U5zH  
 UCHAR key=0; Skl1%`  
 if(m_bControl) '@RlKMnN  
  mask|=4; aB-*l %x  
 if(m_bAlt) :x]gTZ?  
  mask|=2; +bI&0`  
 if(m_bShift) ;%odN d  
  mask|=1; ^10*s,(uS?  
  key=Key_Table[m_Key.GetCurSel()]; pq+Gsu1^  
 if(bRegistered){ md_aD  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ry3;60E \)  
  bRegistered=FALSE; i 4lR$]@  
 } WZdA<<,:o  
 cMask=mask; 8(q4D K\5u  
 cKey=key; %FLz}QW*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); vLJ<_&6  
 return bRegistered; 4vPQuk!  
} 1R~WY'Ed  
7~9f rW<K  
  四、小结 Ak-7}i  
> mDubP  
  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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