Protect a Qt C++ Cross Platform Application
Requirements: QLM Enterprise v15+
Following is a step-by-step procedure to protect a Qt C++ Cross-Platform app. Note that the steps below assume you have a QLM License Server already set up.
1. Launch the QLM Management Console
2. Create a product from the âDefine Productâ tab or use the Demo 1.0 product if you are evaluating QLM.
3. Go to the "Protect your application tab":
Page 1: Select the product to protect and the License Server then click Next
Page 2: Select "Other Languages"
Page 2: Select "Qt C++ Cross Platform"
Page 3: Leave the default settings
Page 4: Select the folder where your want to generate the Qt C++ source code and click Save
Page 5: Click Finish
4. Add the generated files to your project.
5. If you are building on Windows using ming, you may need to execute the ming tool windeployqt.exe as follows: windeployqt.exe <name of your executable>
6. Install OpenSSL
7. Copy the required binaries to your bin folder. On Windows, you will need:
libcrypto-1_1-x64.dll
libgcc_s_seh-1.dll
libssl-1_1-x64
libstdc++-6.dll
libwinpthread-1.dll
Qt6Core.dll
Qt6Gui.dll
Qt6Network.dll
Qt6Widgets.dll
Qt6Xml.dll
7. Review the provided Qt sample to determine how to validate a license at startup. The sample is located in: %Public%\Public Documents\Quick License Manager\Samples\qlmenterprise\Qt
The parameters that may need to be updated in the sample are in mainwindow.cpp:
licenseFile: location where the license file will be created
URL: URL to the QLM License Server
productID: Your product's Product ID as per the Define Products/Product Information tab
majorVersion: Your product's Major Version as per the Define Products/Product Information tab
minorVersion: Your product's Minor Version as per the Define Products/Product Information tab
publicKey: Your product's RSA Public Key as per the Define Products / Encryption Keys tab
In your application, at startup, you must:
Create an instance of the QlmLicense class:
Load the license file if it exists:
To activate a license, create a function called ValidateLicenseOnServer and call it:
To generate a license key for testing purposes:
Go to the Manage Keys tab.
Click "Create Activation Key"
Select the Product (Demo 1.0 for trials) and click Ok.
Copy and Paste the generated Activation Key in the License Wizard launched when your application starts up and follow the steps in the wizard.
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