Transfer File Using QNetworkbb

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AI summary
To transfer a file using HTTP POST in Qt, utilize QNetworkAccessManager and QNetworkRequest. The provided code demonstrates creating a multipart/form-data request, reading a local file, and sending it to a specified upload URL. Ensure to replace the local file path and upload URL as needed. The response is handled by connecting to the finished signal of QNetworkReply, allowing for error checking and response processing.
Tags
FileTransfer
QtNetworking
HttpPost
Last edited time
Jan 20, 2024 01:42 AM
To transfer a file to a remote computer using the HTTP POST protocol in Qt, you can utilize the QNetworkAccessManager and QNetworkRequest classes. Here's a sample code that demonstrates how to achieve this:
In this code, you need to replace the localFilePath with the appropriate path of the file you want to transfer. Additionally, set the desired upload URL in the QNetworkRequest constructor.
The code uses QHttpMultiPart to create a multipart/form-data request for the file upload. It creates a QHttpPart to hold the file data and sets the appropriate headers. The local file data is read using a QFile and set as the body device for the QHttpPart. The file is then appended to the QHttpMultiPart.
A QNetworkAccessManager is used to handle the network requests. A QNetworkRequest is created, specifying the upload URL and the content type header for the multipart request.
The POST request is performed using networkManager.post(), passing the QNetworkRequest and QHttpMultiPart. The response is handled by connecting to the finished signal of the QNetworkReply. Inside the signal handler, the response data is read, and any errors are checked.
Make sure to include the required Qt modules (#include <QNetworkAccessManager>, #include <QNetworkReply>, #include <QNetworkRequest>, #include <QHttpMultiPart>, #include <QHttpPart>, #include <QFile>) and add the appropriate library dependencies in your project file.
Note: This example demonstrates a basic implementation for sending a file using HTTP POST in Qt. In a real-world scenario, you may need to handle error conditions, handle authentication, set additional request headers, and implement more sophisticated error handling and response processing.
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