private static Format InternalGetFormat(string strName, int id)
{
lock (internalSyncObject)
{
EnsurePredefined();
for (int i = 0; i < formatCount; i++)
{
if (formatList[i].Id == id)
{
return(formatList[i]);
}
}
StringBuilder lpString = new StringBuilder(0x80);
if (SafeNativeMethods.GetClipboardFormatName(id, lpString, lpString.Capacity) == 0)
{
lpString.Length = 0;
if (strName == null)
{
lpString.Append("Format").Append(id);
}
else
{
lpString.Append(strName);
}
}
EnsureFormatSpace(1);
formatList[formatCount] = new Format(lpString.ToString(), id);
return(formatList[formatCount++]);
}
}
/// <devdoc>
/// Gets a <see cref='System.Windows.Forms.DataFormats.Format'/> with the Windows
/// Clipboard numeric ID and name for the specified ID.
/// </devdoc>
public static Format GetFormat(int id)
{
// Win32 uses an unsigned 16 bit type as a format ID, thus stripping off the leading bits.
// Registered format IDs are in the range 0xC000 through 0xFFFF, thus it's important
// to represent format as an unsigned type.
ushort clampedId = (ushort)(id & 0xFFFF);
lock (s_internalSyncObject)
{
EnsurePredefined();
for (int n = 0; n < s_formatCount; n++)
{
if (s_formatList[n].Id == clampedId)
{
return(s_formatList[n]);
}
}
// The max length of the name of clipboard formats is equal to the max length
// of a Win32 Atom of 255 chars. An additional null terminator character is added,
// giving a required capacity of 256 chars.
var nameBuilder = new StringBuilder(256);
// This can happen if windows adds a standard format that we don't know about,
// so we should play it safe.
if (SafeNativeMethods.GetClipboardFormatName(clampedId, nameBuilder, nameBuilder.Capacity) == 0)
{
nameBuilder.Length = 0;
nameBuilder.Append("Format").Append(clampedId);
}
EnsureFormatSpace(1);
s_formatList[s_formatCount] = new Format(nameBuilder.ToString(), clampedId);
return(s_formatList[s_formatCount++]);
}
}
/// <include file='doc\DataFormats.uex' path='docs/doc[@for="DataFormats.InternalGetFormat"]/*' />
/// <devdoc>
/// Allows a the new format name to be specified if the requested format is not
/// in the list
/// </devdoc>
/// <internalonly/>
private static Format InternalGetFormat(string strName, ushort id)
{
lock (internalSyncObject) {
EnsurePredefined();
for (int n = 0; n < formatCount; n++)
{
if (formatList[n].Id == id)
{
return(formatList[n]);
}
}
StringBuilder s = new StringBuilder(128);
// This can happen if windows adds a standard format that we don't know about,
// so we should play it safe.
//
if (0 == SafeNativeMethods.GetClipboardFormatName(id, s, s.Capacity))
{
s.Length = 0;
if (strName == null)
{
s.Append("Format").Append(id);
}
else
{
s.Append(strName);
}
}
EnsureFormatSpace(1);
formatList[formatCount] = new Format(s.ToString(), id);
return(formatList[formatCount++]);
}
}