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ansuhua
ansuhua
Last Activity: Feb 13 '08, 01:41 AM
Joined: Sep 18 '07
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  • ansuhua
    started a topic MySql file structure?
    in MySQL

    MySql file structure?

    Hi,

    I want to build a file structure to store information in binary format. Can mysql file structure be used for reference?

    How is the mysql file structure?
    What is .MYD format?

    Thanks
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    • ansuhua
      started a topic how to read and write big file using c#?
      in .NET

      how to read and write big file using c#?

      Hi,

      In windows api,there is a method to read and write big file using memory maping,such as:

      CreateFile(...)
      CreateFileMappi ng(...)
      MapViewOfFile(. ..)

      But i didn't find the methods similar to above in c#.

      Does c# has poor performance on big file.

      thanks
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      • ansuhua
        started a topic How to read "long" value from Excel using C#
        in .NET

        How to read "long" value from Excel using C#

        Hi,

        I want to read a long string(34242519 8510303710) from Excel,but what i get
        is "#####", why?

        code :

        string m_czxm = ((Excel.Range)A ctiveSheet.Cell s.get_Item(2, 2)).Text.ToStri ng().Trim();

        Thanks.
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        • ansuhua
          started a topic To create a binary file library
          in .NET

          To create a binary file library

          Hi,

          I need a big binary file to hold data, as DataBase does.
          Now I have several type libraries,in each library,there are some different parameter. For example,there are 3 school in a city,the first school has 10
          classes,calss 1 has 50 students and class 2 has 45 students ,etc. I need to
          save the information of all students,

          How to design the file structure, all data are in the same file.
          ...
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          • ansuhua
            replied to how to delete a chunk of bytes in a binary file
            in .NET
            Hi,

            How to insert an EOF to terninate the file?

            After I deleted the data at a position, I removed the rest data to this position and then I call SetLength to set new file size.
            Is there any other good methods?

            thanks....
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              Leave a comment:

            • ansuhua
              started a topic how to delete a chunk of bytes in a binary file
              in .NET

              how to delete a chunk of bytes in a binary file

              Hi,

              How can I delete a chunk of bytes in my binary files to decrease the size.
              I read an write bytes from or to file in Stream.
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              • ansuhua
                replied to insert bytes to a file
                in .NET
                Good idea,Thank you very much!...
                See more | Go to post

                  Leave a comment:

                • ansuhua
                  replied to insert bytes to a file
                  in .NET
                  thanks ,do you mean that i should move the rest of the file to another file and then move back?
                  My file is big,Maybe 200M~2000M.I think it will be slow to move so many data....
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                    Leave a comment:

                  • ansuhua
                    started a topic insert bytes to a file
                    in .NET

                    insert bytes to a file

                    I need save huge data in a file in byte format.Sometime s i have to insert some bytes in a special position.I use FileStream,but i can only append byte at the end of the file or rewrite data in the file.So how can i insert bytes into the file without destroy other data?

                    thanks
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