/// <summary>
/// saves the icon to a stream
/// </summary>
/// <param name="str">The string.</param>
/// <exception cref="System.ArgumentNullException">str</exception>
/// <exception cref="System.Exception">icon is empty</exception>
public unsafe void Save(Stream str)
{
if (str == null)
{
throw new ArgumentNullException("str");
}
if (_images.Count < 1)
{
throw new Exception("icon is empty");
}
//write file header
ICONDIR fileheader = new ICONDIR((short)(_images.Count));
fileheader.Write(str);
//write direntries
int fileoffset = sizeof(ICONDIR) +
_images.Count * sizeof(ICONDIRENTRY);
foreach (IconImage img in _images)
{
ICONDIRENTRY entry = img.GetEntry();
entry.FileOffset = fileoffset;
fileoffset += entry.SizeInBytes;
entry.Write(str);
}
//write images
foreach (IconImage img in _images)
{
img.Write(str);
}
}
/// <summary>
/// Loads the specified string.
/// </summary>
/// <param name="str">The string.</param>
/// <exception cref="System.Exception">
/// this is not an icon file
/// or
/// no iconimages contained
/// </exception>
private void Load(Stream str)
{
//read the file header and check
ICONDIR fileheader = new ICONDIR(str);
if (fileheader.idType != 1)
{
throw new Exception("this is not an icon file");
}
if (fileheader.idCount < 1)
{
throw new Exception("no iconimages contained");
}
//read direntries
ICONDIRENTRY[] entries = new ICONDIRENTRY[fileheader.idCount];
for (int i = 0; i < fileheader.idCount; i++)
{
entries[i] = new ICONDIRENTRY(str);
}
//read images
for (int i = 0; i < fileheader.idCount; i++)
{
_images.Add(IconImage.FromStream(str));
}
}