CODEWITHSUNDEEP
c#asp.netfilestream
Saleh Rezaei
Saleh Rezaei

Reputation: 159

FileStream returns Length = 0

I'm trying to read a local file and upload it on ftp server. when i read a image file, everything is ok, but when i read a doc or docx file, FileStream returns length = 0. Here is my code: i checked with some other files, it appears that it only works fine with images and it returns 0 for any other file

if (!ftpClient.FileExists(fileName))
{
    try
    {
        ftpClient.ValidateCertificate += (control, e) => { e.Accept = true; };

        const int BUFFER_SIZE = 64 * 1024; // 64KB buffer
        byte[] buffer = new byte[BUFFER_SIZE];
        using (Stream readStream = new FileStream(tempFilePath, FileMode.Open, FileAccess.Read))
        using (Stream writeStream = ftpClient.OpenWrite(fileName))
        {
            while (readStream.Position < readStream.Length)
            {
                buffer.Initialize();
                int bytesRead = readStream.Read(buffer, 0, BUFFER_SIZE);
                writeStream.Write(buffer, 0, bytesRead);
            }
            readStream.Flush();
            readStream.Close();
            writeStream.Flush();
            writeStream.Close();
            DeleteTempFile(tempFilePath);
            return true;
        }
    }
    catch (Exception ex)
    {
        return false;
    }
}

I couldn't find whats wrong with it. could you please help me?

Upvotes: 4

Views: 4759

Answers (2)

Saleh Rezaei
Saleh Rezaei

Reputation: 159

it was just a silly mistake, i have two fileupload and i've saved the other fileupload, so it creates a zero length file. as it appears the code works fine. thanks everyone.

Upvotes: 0

spender
spender

Reputation: 120470

While this doesn't answer your specific question, you don't actually need to know the length of your stream. Just keep reading until you hit a zero length read. A zero byte read is guaranteed to indicate the the end of any stream.

Return Value

Type: System.Int32

The total number of bytes read into the buffer. This can be less than the number of bytes requested if that many bytes are not currently available, or zero (0) if the end of the stream has been reached.

while (true)
{
    int bytesRead = readStream.Read(buffer, 0, BUFFER_SIZE);
    if(bytesRead==0)
    {
        break;
    }
    writeStream.Write(buffer, 0, bytesRead);
}

alternatively:

readStream.CopyTo(writeStream);

is probably the most concise method of stating your goal...

Upvotes: 1

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