4 replies to this topic

[blubblub]

Hello,
I'm trying to load an xml file residing on the SD Card. The original file is 82kb in size and will not load. But if I reduce the file's size to 1kb it works. The error "CLR_E_OUT_OF_MEMORY" occurs when attempting to load the 82kb file. Does a limitation exist that I'm not aware of? Thanks in advance!!! My code below:

using (StreamReader r = new StreamReader("\\SD\\test.xml"))
                {
                    if (r.BaseStream.Length > 0)
                    {
                        do
                        {
                            
                            string line = r.ReadToEnd();
                            Debug.Print(line);
                            r.Close();


                        } while (!r.EndOfStream);
                    }
       
                }

[Chris Walker]

Hi blubblub, In the world of microcontroller programming, you'll generally want to break things down into chunks. Your Netduino Plus has about 28KB of available RAM--so reading an 82KB file in one chunk will not fit... If you create a buffer of, say, 1024 bytes and read the file in chunks does that work for you? Welcome to the Netduino community, Chris

[Omar (OZ)]

Hello,
I'm trying to load an xml file residing on the SD Card. The original file is 82kb in size and will not load. But if I reduce the file's size to 1kb it works. The error "CLR_E_OUT_OF_MEMORY" occurs when attempting to load the 82kb file. Does a limitation exist that I'm not aware of? Thanks in advance!!! My code below:

using (StreamReader r = new StreamReader("\\SD\\test.xml"))
                {
                    if (r.BaseStream.Length > 0)
                    {
                        do
                        {
                            
                            string line = r.ReadToEnd();
                            Debug.Print(line);
                            r.Close();


                        } while (!r.EndOfStream);
                    }
       
                }

The problem is that your file is too big for the netduino to store on 'line'. try this:

using (StreamReader r = new StreamReader("\\SD\\test.xml"))
                {
                    if (r.BaseStream.Length > 0)
                    {
                        do
                        {
                            Debug.Print(r.ReadLine());
                        } while (!r.EndOfStream);
                        r.Close();

                    }
       
                }

Each line should be small enough that the netduino can store it in RAM. Let me know if that works out.

EDIT:
You win again Chris ... What Chris said is a good idea too, in case the lines are longer than expected.

By the way, coolest name ever! 'blubblub' nice

[phantomtypist]

Consider storing your data in JSON format instead of XML to save space.

[blubblub]

Oz, I tried "the quick fix" but received an IndexOutOfRangeException. In the end what Chris said about chunking the data works for this project. After the code below creates string chunks I'll trim the ends and make them xml. I should be able to grab the attributes I'm looking for from each element. The JSON idea makes sense but I'm working on xml files purposed for something else. I'm open to suggestions. I want to learn! That was a great first lesson. Thanks again!

FileStream fs = new FileStream("\\SD\\test.xml", FileMode.Open, FileAccess.Read);

            int nBits = 512;
            byte[] ByteArray = new byte[nBits];
            int nBytesRead = fs.Read(ByteArray, 0, nBits);
            string strLine = "";
            char[] CharArray = Encoding.UTF8.GetChars(ByteArray);
            foreach (char i in CharArray)
            {
                strLine = strLine + i;
            }

            Debug.Print(strLine);