Here is what I have, I am not getting back any values all are returned as
zero. But it seems to me that the call is not running at all. what am i
doing wrong or missing?
public class WinApi
{
[DllImport("kernel32.dll", SetLastError=true, CharSet=CharSet.Auto)]
public static extern bool GetDiskFreeSpaceEx(
[MarshalAs(UnmanagedType.LPTStr)] string lpDirectoryName,
[MarshalAs(UnmanagedType.U8)] long lpFreeBytesAvailable,
[MarshalAs(UnmanagedType.U8)] long lpTotalNumberOfBytes,
[MarshalAs(UnmanagedType.U8)] long lpTotalNumberOfFreeBytes);
}
protected void GetFreeSpace()
{
long lFreeBytes = 0;
long lTotBytes = 0;
long lTotFreeBytes = 0;
string sDir = "C:\\";
bool bOk = WinApi.GetDiskFreeSpaceEx(sDir, lFreeBytes, lTotBytes,
lTotFreeBytes);
if (bOk)
Console.Write(lFreeBytes.ToString());
} 3 1449
John,
Import the System.ComponentModel namespace and then do this:
if (bOk)
Console.Write(lFreeBytes.ToString());
else
throw new Win32Exception();
This will throw an exception with the information why the call failed
(if it did).
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- ni**************@exisconsulting.com
"John Cantley" <jc*******@hotmail.com> wrote in message
news:e0**************@TK2MSFTNGP12.phx.gbl... Here is what I have, I am not getting back any values all are returned as zero. But it seems to me that the call is not running at all. what am i doing wrong or missing?
public class WinApi { [DllImport("kernel32.dll", SetLastError=true, CharSet=CharSet.Auto)] public static extern bool GetDiskFreeSpaceEx( [MarshalAs(UnmanagedType.LPTStr)] string lpDirectoryName, [MarshalAs(UnmanagedType.U8)] long lpFreeBytesAvailable, [MarshalAs(UnmanagedType.U8)] long lpTotalNumberOfBytes, [MarshalAs(UnmanagedType.U8)] long lpTotalNumberOfFreeBytes); }
protected void GetFreeSpace() { long lFreeBytes = 0; long lTotBytes = 0; long lTotFreeBytes = 0; string sDir = "C:\\"; bool bOk = WinApi.GetDiskFreeSpaceEx(sDir, lFreeBytes, lTotBytes, lTotFreeBytes); if (bOk) Console.Write(lFreeBytes.ToString()); }
John,
You should pass a "pointer to a long" for the out arguments in both, the declaration and the call.
[MarshalAs(UnmanagedType.U8)] ref long lpFreeBytesAvailable,
....
bool bOk = WinApi.GetDiskFreeSpaceEx(sDir, ref lFreeBytes, ref lTotBytes,
ref lTotFreeBytes);
Willy.
"John Cantley" <jc*******@hotmail.com> wrote in message news:e0**************@TK2MSFTNGP12.phx.gbl... Here is what I have, I am not getting back any values all are returned as zero. But it seems to me that the call is not running at all. what am i doing wrong or missing?
public class WinApi { [DllImport("kernel32.dll", SetLastError=true, CharSet=CharSet.Auto)] public static extern bool GetDiskFreeSpaceEx( [MarshalAs(UnmanagedType.LPTStr)] string lpDirectoryName, [MarshalAs(UnmanagedType.U8)] long lpFreeBytesAvailable, [MarshalAs(UnmanagedType.U8)] long lpTotalNumberOfBytes, [MarshalAs(UnmanagedType.U8)] long lpTotalNumberOfFreeBytes); }
protected void GetFreeSpace() { long lFreeBytes = 0; long lTotBytes = 0; long lTotFreeBytes = 0; string sDir = "C:\\"; bool bOk = WinApi.GetDiskFreeSpaceEx(sDir, lFreeBytes, lTotBytes, lTotFreeBytes); if (bOk) Console.Write(lFreeBytes.ToString()); }
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