Using LexActivator with Delphi
First of all, login to your Cryptlex account and download the LexActivator library for Windows or macOS:
The above download package contains the library which you will be using to add licensing to your app.
Adding licensing to your app
After you've added a product for your app in the dashboard, go to the product page of the product you will be adding licensing to. You will need to do two things:
- Note the product id for the product.
- Download the Product.dat for the product.
Product.dat contains product data that is used by LexActivator. The product id is the identifier of your product that is to be used in the code.
Adding the library to your app
LexActivator example project for Delphi (7 or newer) contains the LexActivator.pas unit file. In addition to that, it includes LexActivator.DelphiFeatures.pas unit file used internally.
You need to add these files to your app in order to use LexActivator API in your app. Both units must be added, but only the LexActivator unit must be added to the uses list. Depending on the OS you are targeting you need to copy the respective LexActivator.dll, libLexActivator.so, or libLexActivator.dylib to your project.
LexActivator has a dependency on
VS2015 runtime on Windows. On the target machines where you will deploy your app, you can install the VS2015 runtime, if not present, using the link: https://www.microsoft.com/en-in/download/details.aspx?id=48145Setting product.dat file and product Id
The first thing you need to do is either embed the Product.dat file in your app using
LexActivator.SetProductData function or set the absolute path of the file using LexActivator.SetProductFile function.The next thing you need to do is to set the product id of your application in your code using
LexActivator.SetProductId function. It sets the id of the product you will be adding licensing to.1
SetProductData('PASTE_CONTENT_OF_PRODUCT.DAT_FILE');
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SetProductId('PASTE_PRODUCT_ID', lfUser);
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If your app requires admin (root) privileges to run (e.g. services, daemons etc.), instead of passing
lfUser flag, you need to pass lfSystem flag.In case your app doesn't have write access to the disk, you can use
lfInMemory flag instead, which causes all the data to be stored in the memory. But this would require you to activate the license every time you restart the app.License activation
To activate the license in your app using the license key, you will use
LexActivator.ActivateLicense LexActivator API function. It invokes the /v3/activations Cryptlex Web API endpoint, verifies the encrypted and digitally signed response to validate the license.1
var
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Step: string;
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Status: TLAKeyStatus;
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begin
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try
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Step := 'SetLicenseKey'; SetLicenseKey('PASTE_LICENSE_KEY');
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Step := 'ActivateLicense'; Status := ActivateLicense;
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case Status of
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lkOK: ShowMessage('Activation successful!');
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lkExpired: ShowMessage('Activation successful, but license validity has expired!');
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else
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ShowMessage('Error activating the product: ' + LAKeyStatusToString(Status));
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end;
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except
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on E: Exception do
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begin
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ShowMessage('Exception from ' + Step + ': ' + E.ClassName + ': ' + E.Message);
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end;
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end;
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end;
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The above code should be executed at the time of license activation, ideally on a button click.
Verifying license activation
Each time, your app starts, you need to verify whether your license is already activated or not. This verification should occur locally by verifying the cryptographic digital signature of activation. Ideally, it should also asynchronously contact Cryptlex servers to validate and sync the license activation periodically. For this, you need to use
LexActivator.IsLicenseGenuine LexActivator API function.1
var
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Step: string;
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Status: TLAKeyStatus;
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begin
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try
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Step := 'SetProductData'; SetProductData('PASTE_CONTENT_OF_PRODUCT.DAT_FILE');
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Step := 'SetProductId'; SetProductId('PASTE_PRODUCT_ID', lfUser);
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Step := 'IsLicenseGenuine'; Status := IsLicenseGenuine;
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case Status of
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lkOK: ShowMessage('License is genuinely activated!');
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lkExpired: ShowMessage('License is genuinely activated, but has validity has expired!');
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lkGracePeriodOver: ShowMessage('License is genuinely activated, but grace period is over!');
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else
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ShowMessage('Error code: ' + LAKeyStatusToString(Status));
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end;
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except
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on E: Exception do
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begin
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ShowMessage('Exception from ' + Step + ': ' + E.ClassName + ': ' + E.Message);
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end;
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end;
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end;
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The above code should be executed every time user starts the app. After verifying locally, it schedules a periodic server check in a separate thread.
LexActivator.SetLicenseCallback can be used to set notification callback.Need more help
In case you need more help with adding LexActivator to your app, we'll be glad to help you make the integration. You can either post your questions on our support forum or can contact us through email.
Last modified 1yr ago