Programming Forums > Application Development > C++

Lesliect6 · Aug 24th, 2007, 5:56 PM

Hello,

I have been trying to figure this out myself, but without success. I have recently started wxWidgets programming, and I was trying to find a way to write a string to an existing file. The name of the file is a string which I extract from a textBox. Now, in wxWidgets, the string type contained in a textBox is a wxString, so I cannot use it with the standard ofstream. There is a wxFile class, but the Write() method produces a weird error. Here is the code and the error message :

(Toggle Plain Text)

wxFile *file_to_write_to = new wxFile(WxEdit1->GetLineText(1));
if (!file_to_write_to->IsOpened()) // if error while opening file
    ErrorDialog->ShowModal();
else // if file could be opened
{
    file_to_write_to->Seek(pos); // go to a given position in the file
    wxString x="string to write";
    file_to_write_to->Write(x);
    delete file_to_write_to;
}

The program compiles correctly, but when I try to execute this code, I get :

(Toggle Plain Text)

can't write to file descriptor 3 (error 5: access refused)

Now I am pretty sure I have access to everything on my computer, I am in Administrator mode, the file I am opening is just an example file created using Notepad, "example.txt", there are no writing restrictions, no read-only, everything is fine. I get this error with every other file too. I narrowed down the problem and what I can be sure of is that the file IS opened successfully. The problem occurs after the "delete file_to_write_to;", even if I change it to "file_to_write_to->Close();". However, nothing is written to the file.

If there is an easier way to write to a file, please let me know, or help me out with this code, which appears to me to be logical.

Thank you,

Leslie

Aug 24th, 2007, 5:56 PM	#1
Lesliect6 Programmer Join Date: Aug 2005 Posts: 68 Rep Power: 4	wxFile problem Hello, I have been trying to figure this out myself, but without success. I have recently started wxWidgets programming, and I was trying to find a way to write a string to an existing file. The name of the file is a string which I extract from a textBox. Now, in wxWidgets, the string type contained in a textBox is a wxString, so I cannot use it with the standard ofstream. There is a wxFile class, but the Write() method produces a weird error. Here is the code and the error message : (Toggle Plain Text) wxFile file_to_write_to = new wxFile(WxEdit1->GetLineText(1)); if (!file_to_write_to->IsOpened()) // if error while opening file ErrorDialog->ShowModal(); else // if file could be opened { file_to_write_to->Seek(pos); // go to a given position in the file wxString x="string to write"; file_to_write_to->Write(x); delete file_to_write_to; } wxFile file_to_write_to = new wxFile(WxEdit1->GetLineText(1)); if (!file_to_write_to->IsOpened()) // if error while opening file ErrorDialog->ShowModal(); else // if file could be opened { file_to_write_to->Seek(pos); // go to a given position in the file wxString x="string to write"; file_to_write_to->Write(x); delete file_to_write_to; } The program compiles correctly, but when I try to execute this code, I get : (Toggle Plain Text) can't write to file descriptor 3 (error 5: access refused) can't write to file descriptor 3 (error 5: access refused) Now I am pretty sure I have access to everything on my computer, I am in Administrator mode, the file I am opening is just an example file created using Notepad, "example.txt", there are no writing restrictions, no read-only, everything is fine. I get this error with every other file too. I narrowed down the problem and what I can be sure of is that the file IS opened successfully. The problem occurs after the "delete file_to_write_to;", even if I change it to "file_to_write_to->Close();". However, nothing is written to the file. If there is an easier way to write to a file, please let me know, or help me out with this code, which appears to me to be logical. Thank you, Leslie

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Programming Forums > Application Development > C++

wxFile problem