/// <summary>
/// Gets information about a specific patch installation.
/// </summary>
/// <param name="propertyName">The property being retrieved; see remarks for valid properties.</param>
/// <returns>The property value, or an empty string if the property is not set for the patch.</returns>
/// <exception cref="ArgumentOutOfRangeException">An unknown patch or property was requested</exception>
/// <exception cref="InstallerException">The installer configuration data is corrupt</exception>
/// <remarks><p>
/// Win32 MSI APIs:
/// <a href="http://msdn.microsoft.com/library/en-us/msi/setup/msigetpatchinfo.asp">MsiGetPatchInfo</a>,
/// <a href="http://msdn.microsoft.com/library/en-us/msi/setup/msigetpatchinfoex.asp">MsiGetPatchInfoEx</a>
/// </p></remarks>
public override string this[string propertyName]
{
get
{
StringBuilder buf = new StringBuilder("");
uint bufSize = 0;
uint ret;
if (this.Context == UserContexts.UserManaged ||
this.Context == UserContexts.UserUnmanaged ||
this.Context == UserContexts.Machine)
{
ret = NativeMethods.MsiGetPatchInfoEx(
this.PatchCode,
this.ProductCode,
this.UserSid,
this.Context,
propertyName,
buf,
ref bufSize);
if (ret == (uint)NativeMethods.Error.MORE_DATA)
{
buf.Capacity = (int)++bufSize;
ret = NativeMethods.MsiGetPatchInfoEx(
this.PatchCode,
this.ProductCode,
this.UserSid,
this.Context,
propertyName,
buf,
ref bufSize);
}
}
else
{
ret = NativeMethods.MsiGetPatchInfo(
this.PatchCode,
propertyName,
buf,
ref bufSize);
if (ret == (uint)NativeMethods.Error.MORE_DATA)
{
buf.Capacity = (int)++bufSize;
ret = NativeMethods.MsiGetPatchInfo(
this.PatchCode,
propertyName,
buf,
ref bufSize);
}
}
if (ret != 0)
{
return(null);
}
return(buf.ToString());
}
}
