When you create a new Qt Quick project from scratch, you have the following options:
This is called regeneration, and occurs by the Spirit of God (John 3:5-8). The regenerated person believes and is 'in Christ' at which point he has become a 'new creation' (2 Corinthians 5:17). He is a new entity, the same way that a newborn baby is a new person. The old man has gone away, and a new man has arrived.
Note: The SDK for a particular target platform might install additional templates for that platform. For example, the QNX templates are installed as part of the QNX SDK.
Qt Creator creates the necessary boilerplate files. Some of the files are specific to a particular target platform.
Creating Qt Quick Applications
For the Empty and Scroll applications, Qt Creator creates a QML file, main.qml, that you can modify in the Form Editor or the Text Editor.
For the Stack and Swipe applications, Qt Creator generates two UI files, Page1Form.ui.qml and Page2Form.ui.qml, that you can modify in the Form Editor and a QML file, main.qml, that you can modify in the Text Editor to add the application logic.
Creating Qt Quick Based Python Applications
The Qt for Python - Qt Quick Application - Empty wizard enables you to create a Python project that contains a main QML file. Specify the minimum PySide version to run the application.
The wizard adds the following imports to the source file to provide access to QGuiApplication and QQmlApplicationEngine:
The wizard also adds a main function, where it creates a QGuiApplication instance and passes system arguments to the QGuiApplication object:
The following lines in the main class create a QQmlApplicationEngine instance and load the generated QML file to the engine object:
Finally, the wizard adds code that checks whether the file was successfully loaded. If loading the file fails, the application exits with an error code. If loading succeeds, the wizard calls the
app.exec_() method to enter the Qt main loop and start executing the Qt code:
Open the .qml file in the Design mode to design a Qt Quick UI in Qt Quick Designer.
Creating Qt Quick UI Projects
Qt Quick UI Prototype projects are useful for testing or prototyping user interfaces, or for setting up a separate project just for QML editing, for example. You cannot use them for application development, because they do not contain:
For more information about how to turn Qt Quick UI Prototype projects into Qt Quick Application projects, see Converting UI Projects to Applications.
To create a Qt Quick UI Prototype project:
Qt Creator creates the following files:
To use JavaScript and image files in the application, copy them to the project folder.
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Using HttpClient, we can perform Multipart upload, i.e., we can upload larger objects insmaller parts. In this chapter, we demonstrate the multipart upload in HTTP client by uploading a simple text file.
In general, any multipart upload contains three parts.
For the multipart upload using HttpClient, we need to follow the below steps −
Following are the steps to upload a multipart entity using the HttpClient library.
Step 1 - Create an HttpClient object
The createDefault() method of the HttpClients class returns an object of the class CloseableHttpClient, which is the base implementation of the HttpClient interface. Using this method, create an HttpClient object −
Step 2 - Create a FileBody object
FileBody class represents the binary body part backed by a file. Instantiate this class by passing a File object and a ContentType object representing the type of the content.
Step 3 - Create a MultipartEntityBuilder
The MultipartEntityBuilder class is used to build the multi-part HttpEntity object. Create its object using the create() method (of the same class).
Step 4 - Set the mode
A MultipartEntityBuilder has three modes: STRICT, RFC6532, and BROWSER_COMPATIBLE. Set it to the desired mode using the setMode() method.
Step 5 - Add various the desired parts
Using the methods addTextBody(), addPart() and, addBinaryBody(), you can add simple text, files, streams, and other objects to a MultipartBuilder. Add the desired contents using these methods.
Step 6 - Building single entityHelp File Creation
You can build all these parts to a single entity using the build() method of the MultipartEntityBuilder class. Using this method, build all the parts into a single HttpEntity.
Step 7 - Create a RequestBuilder object
The class RequestBuilder is used to build request by adding parameters to it. If the request is of type PUT or POST, it adds the parameters to the request as URL encoded entity.
Create a RequestBuilder object (of type POST) using the post() method. And pass the Urito which you wanted to send the request it as a parameter.
Step 8 - Set the entity object to the RequestBuilder
Set the above created multipart entity to the RequestBuilder using the setEntity() method of the RequestBuilder class.
Step 9 - Build the HttpUriRequest
Build a HttpUriRequest request object using the build() method of the RequestBuilder class.
Step 10 - Execute the request
Using the execute() method, execute the request built in the previous step (bypassing the request as a parameter to this method).
Example
Following example demonstrates how to send a multipart request using the HttpClient library. In this example, we are trying to send a multipart request backed by a file.
OutputNew File Creation 5 990
On executing, the above program generates the following output −
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