public static void StringToCoTaskMemAuto()
{
String s = null;
// passing null string should return 0
Assert.Equal(0, (long)Marshal.StringToCoTaskMemAuto(s));
s = "Hello World";
IntPtr ptr = Marshal.StringToCoTaskMemAuto(s);
// make sure the native memory is correctly laid out
for (int i = 0; i < s.Length; i++)
{
char c = (char)Marshal.ReadInt16(IntPtr.Add(ptr, i << 1));
Assert.Equal(s[i], c);
}
// make sure if we convert back to string we get the same value
String s2 = Marshal.PtrToStringAuto(ptr);
Assert.Equal(s, s2);
// free the native memory
Marshal.FreeCoTaskMem(ptr);
}
public static void PtrToStringAutoWithLength()
{
Assert.Throws <ArgumentNullException>(() => Marshal.PtrToStringAuto(IntPtr.Zero, 0));
String s = "Hello World";
int len = 5;
IntPtr ptr = Marshal.StringToCoTaskMemAuto(s);
String s2 = Marshal.PtrToStringAuto(ptr, len);
Assert.Equal(s.Substring(0, len), s2);
Marshal.FreeCoTaskMem(ptr);
}
public static void StringToCoTaskMemAuto_PtrToStringAuto_ReturnsExpected()
{
string s = "Hello World";
int len = 5;
IntPtr ptr = Marshal.StringToCoTaskMemAuto(s);
try
{
string actual = Marshal.PtrToStringAuto(ptr, len);
Assert.Equal(s.Substring(0, len), actual);
}
finally
{
Marshal.FreeCoTaskMem(ptr);
}
}