public static unsafe IntPtr StringToCoTaskMemAnsi(string s)
{
if (s == null)
{
return(IntPtr.Zero);
}
long lnb = (s.Length + 1) * (long)SystemMaxDBCSCharSize;
int nb = (int)lnb;
// Overflow checking
if (nb != lnb)
{
throw new ArgumentOutOfRangeException(nameof(s));
}
IntPtr hglobal = Win32Native.CoTaskMemAlloc(new UIntPtr((uint)nb));
if (hglobal == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
s.ConvertToAnsi((byte *)hglobal, nb, false, false);
return(hglobal);
}
public static unsafe IntPtr StringToCoTaskMemUni(string s)
{
if (s == null)
{
return(IntPtr.Zero);
}
int nb = (s.Length + 1) * 2;
// Overflow checking
if (nb < s.Length)
{
throw new ArgumentOutOfRangeException(nameof(s));
}
IntPtr hglobal = Win32Native.CoTaskMemAlloc(new UIntPtr((uint)nb));
if (hglobal == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
fixed(char *firstChar = s)
{
string.wstrcpy((char *)hglobal, firstChar, s.Length + 1);
}
return(hglobal);
}
public static unsafe IntPtr StringToCoTaskMemUTF8(string s)
{
if (s == null)
{
return(IntPtr.Zero);
}
int nb = Encoding.UTF8.GetMaxByteCount(s.Length);
IntPtr pMem = Win32Native.CoTaskMemAlloc(new UIntPtr((uint)nb + 1));
if (pMem == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
fixed(char *firstChar = s)
{
byte *pbMem = (byte *)pMem;
int nbWritten = Encoding.UTF8.GetBytes(firstChar, s.Length, pbMem, nb);
pbMem[nbWritten] = 0;
}
return(pMem);
}
public static IntPtr AllocCoTaskMem(int cb)
{
IntPtr pNewMem = Win32Native.CoTaskMemAlloc(new UIntPtr((uint)cb));
if (pNewMem == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
return(pNewMem);
}