openfile.cpp

to show the waveform of audio file and play it on computer Purpose: Familiar with WAV file format a

//多媒体作业：wav播放器
//0213202班 赵子铭
//filename  POPFILE.Cpp
//for the open dialogue

#include <windows.h>
#include <commdlg.h>
#include <stdlib.h>
#include <stdio.h>
#include "WavHead.h"

static OPENFILENAME ofn ;

void PopFileInitialize (HWND hwnd)
     {
     static char szFilter[] = "WAV Files (*.Wav)\0*.wav\0";

     ofn.lStructSize       = sizeof (OPENFILENAME) ;
     ofn.hwndOwner         = hwnd ;
     ofn.hInstance         = NULL ;
     ofn.lpstrFilter       = szFilter ;
     ofn.lpstrCustomFilter = NULL ;
     ofn.nMaxCustFilter    = 0 ;
     ofn.nFilterIndex      = 0 ;
     ofn.lpstrFile         = NULL ;          // Set in Open and Close functions
     ofn.nMaxFile          = _MAX_PATH ;
     ofn.lpstrFileTitle    = NULL ;          // Set in Open and Close functions
     ofn.nMaxFileTitle     = _MAX_FNAME + _MAX_EXT ;
     ofn.lpstrInitialDir   = NULL ;
     ofn.lpstrTitle        = NULL ;
     ofn.Flags             = 0 ;             // Set in Open and Close functions
     ofn.nFileOffset       = 0 ;
     ofn.nFileExtension    = 0 ;
     ofn.lpstrDefExt       = "txt" ;
     ofn.lCustData         = 0L ;
     ofn.lpfnHook          = NULL ;
     ofn.lpTemplateName    = NULL ;
     }

BOOL PopFileOpenDlg (HWND hwnd, PSTR pstrFileName, PSTR pstrTitleName)
     {
     ofn.hwndOwner         = hwnd ;
     ofn.lpstrFile         = pstrFileName ;
     ofn.lpstrFileTitle    = pstrTitleName ;
     ofn.Flags             = OFN_HIDEREADONLY | OFN_CREATEPROMPT ;

     return GetOpenFileName (&ofn) ;
     }



long PopFileLength (FILE *file)
     {
     int iCurrentPos, iFileLength ;

     iCurrentPos = ftell (file) ;

     fseek (file, 0, SEEK_END) ;

     iFileLength = ftell (file) ;

     fseek (file, iCurrentPos, SEEK_SET) ;

     return iFileLength ;
     }