public static void SetCommandText(IntPtr pCmdTextInt, string text)
{
if (text != null)
{
OLECMDTEXT olecmdtext = (OLECMDTEXT)Marshal.PtrToStructure(pCmdTextInt, typeof(OLECMDTEXT));
if ((olecmdtext.cmdtextf & (uint)OLECMDTEXTF.OLECMDTEXTF_NAME) == 0)
{
return;
}
char[] source = text.ToCharArray();
IntPtr bufferOffset = Marshal.OffsetOf(typeof(OLECMDTEXT), "rgwz");
IntPtr lengthOffset = Marshal.OffsetOf(typeof(OLECMDTEXT), "cwActual");
int length = Math.Min(((int)olecmdtext.cwBuf) - 1, source.Length);
// copy the new text
long bufferAddress = (long)pCmdTextInt + (long)bufferOffset;
Marshal.Copy(source, 0, (IntPtr)bufferAddress, length);
// null terminator
Marshal.WriteInt16(pCmdTextInt, (int)bufferOffset + (length * 2), 0);
// length including null terminator
Marshal.WriteInt32(pCmdTextInt, (int)lengthOffset, length + 1);
}
}
public static IntPtr OffsetOf <T>(string fieldName)
{
#if NET45
return(SystemMarshal.OffsetOf(typeof(T), fieldName));
#else
return(SystemMarshal.OffsetOf <T>(fieldName));
#endif
}
private static string GetCommandText(IntPtr structPtr)
{
if (structPtr == IntPtr.Zero)
{
return(string.Empty);
}
OLECMDTEXT olecmdtext = (OLECMDTEXT)Marshal.PtrToStructure(structPtr, typeof(OLECMDTEXT));
if (olecmdtext.cwActual == 0)
{
return(string.Empty);
}
IntPtr offset = Marshal.OffsetOf(typeof(OLECMDTEXT), "rgwz");
IntPtr ptr = (IntPtr)((long)structPtr + (long)offset);
return(Marshal.PtrToStringUni(ptr, (int)olecmdtext.cwActual - 1));
}
public static IntPtr OffsetOf <T>(string fieldName)
{
return(SystemMarshal.OffsetOf <T>(fieldName));
}