/// <summary>Handles the critical feature button click event.</summary>
/// <param name="sender">The sender object.</param>
/// <param name="e">Event arguments</param>
private void criticalFeatureButton_Click(object sender, EventArgs e)
{
if (SampleLicense.IsClockBackdatedAtRuntime(m_LastLicenseValidationTime))
{
//It looks like our system clock was back-dated while the application was running.
m_LastLicenseValidationResult = false;
m_License.LastError = new LicenseError(LicenseError.ERROR_SYSTEM_TIME_INVALID);
}
else if (m_LastLicenseValidationResult && m_License.TypeOfLicense != LicenseTypes.FullNonExpiring)
{
//If the license is time-limited, and prior validation has passed, check to make sure the license is not expired (since time has passed since the last validation).
LicenseEffectiveDateValidation dateValidation = new LicenseEffectiveDateValidation(m_License);
if (!dateValidation.Validate())
{
m_LastLicenseValidationResult = false;
m_LastLicenseValidationTime = DateTime.UtcNow;
m_License.LastError = dateValidation.LastError;
}
}
if (!m_LastLicenseValidationResult)
{
//Double check the license validation result. This prevents a hacker from sending a window message
//to enable the button regardless of the validation result.
UpdateLicenseStatus();
sampleLicensingGui.ShowDialog(LicensingGuiDialog.LicenseManagement, this, FormStartPosition.CenterParent);
return;
}
MessageBox.Show("This is a critical feature!");
}
/// <summary>Shows the <see cref="LicensingGui"/> object's license management form.</summary>
private void ManageLicense()
{
if (LicenseConfiguration.EncryptionKey.LastError.ErrorNumber != LicenseError.ERROR_NONE &&
LicenseConfiguration.EncryptionKey.LastError.ErrorNumber != LicenseError.ERROR_PLUS_EVALUATION_WARNING)
{
m_License.LastError = LicenseConfiguration.EncryptionKey.LastError;
}
else if (SampleLicense.IsClockBackdatedAtRuntime(m_LastLicenseValidationTime))
{
//It looks like our system clock was back-dated while the application was running.
m_LastLicenseValidationResult = false;
m_License.LastError = new LicenseError(LicenseError.ERROR_SYSTEM_TIME_INVALID);
}
else if (m_License.LastError.ErrorNumber != LicenseError.ERROR_COULD_NOT_LOAD_LICENSE)
{
//If the license was loaded, validate it.
m_LastLicenseValidationResult = m_License.Validate();
m_LastLicenseValidationTime = DateTime.UtcNow;
}
//Update the license status on the form.
UpdateLicenseStatus();
//Show the license management dialog.
sampleLicensingGui.ShowDialog(LicensingGuiDialog.LicenseManagement, this, FormStartPosition.CenterParent);
}
/// <summary>Shows the <see cref="LicensingGui"/> object's license management form.</summary>
private void ManageLicense()
{
if (LicenseConfiguration.EncryptionKey.LastError.ErrorNumber != LicenseError.ERROR_NONE &&
LicenseConfiguration.EncryptionKey.LastError.ErrorNumber != LicenseError.ERROR_PLUS_EVALUATION_WARNING)
{
m_License.LastError = LicenseConfiguration.EncryptionKey.LastError;
}
else if (SampleLicense.IsClockBackdatedAtRuntime(m_LastLicenseValidationTime))
{
m_LastLicenseValidationResult = false;
m_License.LastError = new LicenseError(LicenseError.ERROR_SYSTEM_TIME_INVALID);
}
else if (m_License.LastError.ErrorNumber != LicenseError.ERROR_COULD_NOT_LOAD_LICENSE)
{
m_LastLicenseValidationResult = m_License.Validate();
m_LastLicenseValidationTime = DateTime.UtcNow;
statusLabel.Text = "Status: " + m_License.LastError.ErrorString;
}
this.criticalFeatureButton.Enabled = UpdateLicenseStatus();
sampleLicensingGui.ShowDialog(LicensingGuiDialog.LicenseManagement, this, FormStartPosition.CenterParent);
//Update the status
this.criticalFeatureButton.Enabled = UpdateLicenseStatus();
}