How to Use DEMO Code Snippets

DEMO code snippets are usually a single C++/C# source code with a main function body, demonstrating how some LPW functions are called. The code snippets files are located under demo/snippets folder.

To compile and run the DEMO code snippets, you should firstly create a Visual Studio project, then add or copy the code snippets file to the project. You may also modify some in the code like the image path to a true accessible path. Then, you may compile and run the project as usual. The algorithms' results are displayed via LDisplay control in the code snippets.

NOTE: The platform of DEMOs should be exactly the same as the LPW dlls you installed and registered.
NOTE: Please make sure the LPW dlls are registered and licensed before running the DEMOs.

Create a New Visual Studio Project

Step 1 - New a Console App Project

C++

Open Visual Studio, click File -> New -> Project in the menu, create the new Console App project as the following.

C#

Open Visual Studio, click File -> New -> Project, create the Console App(.NET Framework) project as the following.

Step 2 - Add the code snippets to the project

C++

Remove the auto-generated .cpp file in the new project, right click the project and select Add -> Existing Item, browse to the code snippets file and add it to the project.

Alternatively, you may copy and paste the content of the code snippets to the auto-generated .cpp file in the new project.

Add include folder to the project's C++ include confuguration.

C#

Remove the auto-generated .cs file in the new project, right click the project and select Add -> Existing Item, browse to the code snippets file and add it to the project.

Alternatively, you may copy and paste the content of the code snippets to the auto-generated .cs file in the new project.

Add the LPW libraries to the project's reference, according to the includes in the code snippets.

1. RMC your C# project, click "Add Reference".
2. Under COM -> Type Libraries panel, search and find LPVCoreLib (must-have) and other LPVXXXLibs according to your application, then click OK to add reference (and Interop) to them in your project.

Step 3 - Modify the File Paths

Modify the file paths in the code to be accessible, for example:

C++

    // load some images, add them to list
    ILImagePtr img = LImage::Create();
    // change the path, for example, D:/lpv_install_dir/demo/image/sourceImg.png
    LPVErrorCode err = img->Load(imgDir + L"sourceImg.png");
    if (err != LPVNoError)
        return -1; // load image failed

C#

    // load some images, add them to list
    LImage img = new LImage();
    // change the path, for example, D:/lpv_install_dir/demo/image/sourceImg.png
    LPVErrorCode err = img.Load("images/sourceImg.png");
    if (err != LPVErrorCode.LPVNoError)
        return; // load image failed