internal static string GetImagePathName(Pointers ptrs)
{
//Read original data
var imageLen = Marshal.ReadInt16(ptrs.ImageOffset);
string currentImagePathName = Marshal.PtrToStringUni(ptrs.ImageBuffer, imageLen / 2);
return(currentImagePathName);
}
public static void WriteImagePathName(string imagePathName, Pointers ptrs)
{
//Write the string, char by char
foreach (var unicodeChar in imagePathName)
{
Marshal.WriteInt16(ptrs.ImageBuffer, unicodeChar);
ptrs.ImageBuffer = ptrs.ImageBuffer.Increment(2);
}
Marshal.WriteInt16(ptrs.ImageBuffer, 0);
//Write the new length
Marshal.WriteInt16(ptrs.ImageOffset, (short)(imagePathName.Length * 2));
}
internal static void ChangeImagePathName(string newFileName, Pointers ptrs)
{
string originalImagePathName = GetImagePathName(ptrs);
var newImagePathName = Path.Combine(Path.GetDirectoryName(originalImagePathName), newFileName);
if (newImagePathName.Length > originalImagePathName.Length)
{
throw new Exception("new ImagePathName cannot be longer than the original one");
}
WriteImagePathName(newImagePathName, ptrs);
}
internal static void ChangeImagePathName(string newFileName)
{
Pointers ptrs = GetPointers();
ChangeImagePathName(newFileName, ptrs);
}
