如何使用特殊字符从schema.ini构建DataTable模式

Question

I'm trying to convert a schema.ini file (created by a csv export) to a typed data table in c#. I'm having troubles with getting the table names from the file. The schema.ini looks like this:

[MyTableÄ.csv]
ColNameHeader=True
CharacterSet=1201
Format=CSVDelimited
CurrencyThousandSymbol=,
DecimalSymbol=.
Col1="Id" Integer
Col2="Subscriber Equipment" Char ...

however when I use the following snippet to read the section names I get MyTableÄ.csv instead of MyTableÄ.csv .

public string[] SectionNames()
        {
        uint MAX_BUFFER = 32767;
        IntPtr pReturnedString = Marshal.AllocCoTaskMem((int)MAX_BUFFER);
        uint bytesReturned = GetPrivateProfileSectionNames(pReturnedString, MAX_BUFFER, path);
        if (bytesReturned == 0)
        {
            Marshal.FreeCoTaskMem(pReturnedString);
            return null;
        }
        string local = Marshal.PtrToStringAnsi(pReturnedString, (int) bytesReturned);
        Marshal.FreeCoTaskMem(pReturnedString);
        //use of Substring below removes terminating null for split
        return local.Substring(0, local.Length - 1).Split('\0');
    }

I've tried the charactersets: 20127, ANSI, 65001, Unicode, and 1201 to no avail. Ideas? Workarounds?

Answer 1

1) Save your file with Unicode.

2) Import GetPrivateProfileSectionNames in an alternative way to meet your requirement.

[DllImport("kernel32.dll", EntryPoint="GetPrivateProfileSectionNamesW", CharSet=CharSet.Unicode)]
static extern uint GetPrivateProfileSectionNames(IntPtr lpszReturnBuffer, uint nSize, string lpFileName);

3) Change the call of PtrToStringAnsi to PtrToStringUni .

These steps achieve what you want, the entire code is

[DllImport("kernel32.dll", EntryPoint="GetPrivateProfileSectionNamesW", CharSet=CharSet.Unicode)]
static extern uint GetPrivateProfileSectionNames(IntPtr lpszReturnBuffer, uint nSize, string lpFileName);

public string[] SectionNames() {
    uint MAX_BUFFER=32767;
    IntPtr pReturnedString=Marshal.AllocCoTaskMem((int)MAX_BUFFER);
    uint bytesReturned=GetPrivateProfileSectionNames(pReturnedString, MAX_BUFFER, path);
    if(bytesReturned==0) {
        Marshal.FreeCoTaskMem(pReturnedString);
        return null;
    }
    string local=Marshal.PtrToStringUni(pReturnedString, (int)bytesReturned);
    Marshal.FreeCoTaskMem(pReturnedString);
    //use of Substring below removes terminating null for split
    return local.Substring(0, local.Length-1).Split('\0');
}

BTW, your code appears [ here ] on MSDN forum.