/// <summary>
/// Returns the version string and language string in the format that the installer
/// expects to find them in the database. If you just want version information, set
/// lpLangBuf and pcchLangBuf to zero. If you just want language information, set
/// lpVersionBuf and pcchVersionBuf to zero.
/// </summary>
/// <param name="filePath">Specifies the path to the file.</param>
/// <param name="version">Returns the file version. Set to 0 for language information only.</param>
/// <param name="language">Returns the file language. Set to 0 for version information only.</param>
internal static void GetFileVersion(string filePath, out string version, out string language)
{
int versionLength = 20;
int languageLength = 20;
StringBuilder versionBuffer = new StringBuilder(versionLength);
StringBuilder languageBuffer = new StringBuilder(languageLength);
int error = MsiInterop.MsiGetFileVersion(filePath, versionBuffer, ref versionLength, languageBuffer, ref languageLength);
if (234 == error)
{
versionBuffer.EnsureCapacity(++versionLength);
languageBuffer.EnsureCapacity(++languageLength);
error = MsiInterop.MsiGetFileVersion(filePath, versionBuffer, ref versionLength, languageBuffer, ref languageLength);
}
else if (1006 == error)
{
// file has no version or language, so no error
error = 0;
}
if (0 != error)
{
throw new MsiException(error);
}
version = versionBuffer.ToString();
language = languageBuffer.ToString();
}
