public bool GetString(FormatId id, NativeStringType native, out string result)
{
if (GetDataPresent(id))
{
result = GetString(id, native);
return(true);
}
result = null;
return(false);
}
public string GetString(FormatId id, NativeStringType type)
{
var f = DataObjectUtils.GetFormatEtc(id);
STGMEDIUM s = default;
try
{
DataObject.GetData(ref f, out s);
return(s.GetString(type));
}
finally
{
s.Dispose();
}
}
public void SetString(string str, NativeStringType native = NativeStringType.Unicode)
{
switch (native)
{
case NativeStringType.Unicode:
SetData(FormatId.CF_UNICODETEXT, str);
break;
case NativeStringType.Ansi:
SetData(FormatId.CF_TEXT, str);
break;
default:
break;
}
}
public NativeStringParamAttribute(NativeStringType type)
{
this.type = type;
}
private unsafe HRESULT SaveStringToHandle(ref IntPtr handle, string s, NativeStringType type)
{
if (handle == IntPtr.Zero)
{
return(HRESULT.E_INVALIDARG);
}
switch (type)
{
case NativeStringType.Unicode:
{
int nb = (s.Length + 1) * 2;
// Overflow checking
if (nb < s.Length)
{
throw new ArgumentOutOfRangeException(nameof(s));
}
var hg = Kernel32.GlobalReAlloc(handle, nb,
Kernel32.GMEM.GMEM_MOVEABLE | Kernel32.GMEM.GMEM_ZEROINIT);
handle = hg.DangerousGetHandle();
if (hg.IsNull)
{
return(HRESULT.E_OUTOFMEMORY);
}
var lc = Kernel32.GlobalLock(hg);
fixed(char *firstChar = s)
{
Buffer.MemoryCopy(firstChar, lc.ToPointer(), nb, nb);
}
Kernel32.GlobalUnlock(hg);
break;
}
case NativeStringType.Ansi:
{
// Ansi. See also StringToHGlobalAnsi
long lnb = (s.Length + 1) * (long)Marshal.SystemMaxDBCSCharSize;
int nb = (int)lnb;
if (nb != lnb)
{
throw new ArgumentOutOfRangeException(nameof(s));
}
var hg = Kernel32.GlobalReAlloc(handle, nb,
Kernel32.GMEM.GMEM_MOVEABLE | Kernel32.GMEM.GMEM_ZEROINIT);
handle = hg.DangerousGetHandle();
if (hg.IsNull)
{
return(HRESULT.E_OUTOFMEMORY);
}
var lc = Kernel32.GlobalLock(hg);
StringToAnsiString(s, (byte *)lc.ToPointer(), nb);
Kernel32.GlobalUnlock(hg);
break;
}
case NativeStringType.Utf8:
{
var enc = new UTF8Encoding();
int nb = enc.GetByteCount(s) + 1;
var hg = Kernel32.GlobalReAlloc(handle, nb,
Kernel32.GMEM.GMEM_MOVEABLE | Kernel32.GMEM.GMEM_ZEROINIT);
handle = hg.DangerousGetHandle();
if (hg.IsNull)
{
return(HRESULT.E_OUTOFMEMORY);
}
var lc = Kernel32.GlobalLock(hg);
fixed(char *firstChar = s)
{
enc.GetBytes(firstChar, s.Length, (byte *)lc.ToPointer(), nb);
}
Kernel32.GlobalUnlock(hg);
break;
}
}
return(HRESULT.S_OK);
}
