wxFileInputStream

[mevkurray]

Hi all.

Majorly bamboozled by the wxwidgets file streams. does wxFileInputStream have a GetLine() function, similar to the normal c++ file stream class???

had a wander thru the wx docs, and just ended up more confused.

heres what i want to do btw.
(note, functions are seperate but operate on same file)

here is an example of a possible line for the file being read:

12345`99`KM00099/09`Hello World`Im a line`1token1`2token2`comments

Function 1

open file, containing fields seperated by "`" symbols.
for each line in file:
extract the first field (a set of int's,).
convert this to integer var.
compares this to a variable containg the number of the last line.
keeps the larger of the two

returns the largest number in the first field

Function 2:

Exactly the same as above, but with second field rather than 1st.

Before function 3 is done, the user and program use the above to create a line similar to:
12346`100`KM00100/09`Hello World2`Im a line too`12ndlinetoken1`2blahblahtoken2`comments new entry

Function 3:

takes a line similar to above, as a wxstring, and appends it to the end of the file.

hope this all makes sence

thanks all muchly in advance.

Kev

[mevkurray]

got the brackets wrong. see next post

[mevkurray]

By the way, forgot to mention that i know i cant output (do function 3) with wxFileInputStream. i need to use wxFileOutputStream.

i got it to output something, but when i open the file, it seems corrupted. however in the preview in the icon of the file (running ubuntu) i can read the correct numbers (the icon displays "12346`... " only, so i dont know if the rest of the file is correct)

Heres the code that does that:

wxsNewEntryLine<<intLastLineID;
wxsNewEntryLine +=_("`");
wxsNewEntryLine+= cbxSpeciesBotanical->GetValue();
wxsNewEntryLine +=_("`");
wxDateTime wxdDate= dteDate->GetValue();
wxString wxsDate = wxdDate.FormatDate();
wxsNewEntryLine += wxsDate;
wxsNewEntryLine +=_("`");
wxsNewEntryLine+=tbxLocation->GetLineText(0);
wxsNewEntryLine +=_("`");
wxsNewEntryLine+=tbxLongitude->GetLineText(0);
wxsNewEntryLine +=_("`");
wxsNewEntryLine+= tbxLatitude->GetLineText(0);
wxsNewEntryLine +=_("`");

int ccc = tbxComments->GetNumberOfLines();
for (int aaa=0;aaa<ccc;aaa++)
{

wxsNewEntryLine+= tbxComments->GetLineText(aaa);
wxsNewEntryLine +=_("&");
}


strFile = CONFIG_HOMEDIR;

strFile+= ".data/CollectionData2.txt";

wxString wxsFileName(strFile.c_str(),wxConvUTF8);


wxFile wxofsFile(wxsFileName,wxFile::write_append);
wxofsFile.SeekO(0,wxFromEnd);
wxofsFile.Write(wxsNewEntryLine,wxsNewEntryLine.Len());
wxofsFile.Sync();
wxofsFile.Close();

sorry if i didnt get the code brackets right. i tried =]

thanks

[mevkurray]

Well:

i stumbled across wxTextFile, so that answers my last querry. however, when using the addline function, it deletes everything but the lines i add. is there a way to stop its doing this, or is there a work-around (maybe read file to wxstring array and then add each element of array?? tried below). im well and truely stuck AGAIN *grrr*

so, heres the code that makes a new entry in my text file. note ive tried to use the string array as above, without result. =[

wxString wxsNewEntryLine;
    wxString wxsFileName;
    int intNewEntryLineID=-1;
    char *chrLine;
    char *chrToken;
    int intThisLineID = -1;
    int intLastLineID = -1;
    int intLargestID =0;


    wxsFileName = CONFIG_HOMEDIR;
    wxsFileName += CONFIG_COLLECTIONDATA;

///////////////// TEMPORY FIX!!!!!. WORKING ON A FUNCTION TO GENERATE THE LARGEST PREVIOUS NUMERIC ID. AT THIS STAGE IT MAKES NO DIFERENCE WHAT THE ID IS.
    intLargestID++;



    wxsNewEntryLine<<intLargestID;
    wxsNewEntryLine +=_("`");
    wxsNewEntryLine += cbxSpeciesBotanical->GetValue();
    wxsNewEntryLine +=_("`");
        wxDateTime wxdDate = dteDate->GetValue();
        wxString wxsDate = wxdDate.FormatDate();
    wxsNewEntryLine += wxsDate;
    wxsNewEntryLine +=_("`");
    wxsNewEntryLine +=tbxLocation->GetLineText(0);
    wxsNewEntryLine +=_("`");
    wxsNewEntryLine +=tbxLongitude->GetLineText(0);
    wxsNewEntryLine +=_("`");
    wxsNewEntryLine += tbxLatitude->GetLineText(0);
    wxsNewEntryLine +=_("`");

        int ccc = tbxComments->GetNumberOfLines();
        for (int aaa=0;aaa<ccc;aaa++)
        {

        wxsNewEntryLine+= tbxComments->GetLineText(aaa);
        wxsNewEntryLine +=_("&");
        }
        //wxsNewEntryLine +=_("`");


    wxsFileName= CONFIG_HOMEDIR;
    wxsFileName+= _(".data/CollectionData3.txt");

    wxTextFile wxtfleOutFile(_("/home/kevin/Documents/SeedBank/.data/CollectionData3.txt"));
    int intNumLines = -1;
    intNumLines = wxtfleOutFile.GetLineCount();
    const int cintNumLines = intNumLines;
    wxString awxsFileContents[cintNumLines];
    for(int ddd = 1;ddd<cintNumLines;ddd++)
    {
        awxsFileContents[ddd] = wxtfleOutFile.GetLine(ddd);
    }

    wxtfleOutFile.Write();
    wxtfleOutFile.Close();


    //wxtfleOutFile.Open(_("/home/kevin/Documents/SeedBank/.data/CollectionData3.txt"));

    for (int eee=1;eee<intNumLines;eee++)
    {
        wxtfleOutFile.AddLine(awxsFileContents[eee]);
    }

    wxtfleOutFile.AddLine(wxEmptyString);
    wxtfleOutFile.AddLine(wxsNewEntryLine);
    wxtfleOutFile.Write();



    wxMessageBox(_("Closing."));

thanks all for your time and paitence. =]

[mevkurray]

Hi all. someone did solve this thread, and for some reason the post hasnt shown up. so i will repost the code here:

wxTextFile wxtfleOutFile(); // DO NOT INCLUDE FILE PATH IN CONSTUCTOR, UNLESS YOU WANT THE FILE OVERWRITTEN

wxtfleOutFile.Open(_("your/file.txt"));
//USE PATH HERE INSTEAD

wxtfleOutFile.AddLine(wxsNewEntryLine);


wxtfleOutFile.Write();