Qt客户端模拟web端通过表单方式上传图片-QHttpMultiPart

末蓝、 2023-07-13 04:18 21阅读 0赞

# 背景 #

在一个项目中，对接一个阿里云分享图片接口，此前已有安卓客户端通过web页面上传自己的本地图片到服务端（使用的okhttp），C++使用Qt相关库也是可以完成的。

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完整测试上传代码如下：

#include <QtCore/QCoreApplication>
    #include <QFileInfo>
    #include <QHttpMultiPart>
    #include <QNetworkAccessManager>
    #include <QNetworkReply>
    
    void uploadImages(const QStringList& vsFilePathList)
    {
    	if (vsFilePathList.empty())
    	{
    		return;
    	}
    
    	QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
    	for (const auto& filePathIter : vsFilePathList)
    	{
    		QHttpPart imagePart;
    		QFileInfo filInfo(filePathIter);
    		QFile file(filePathIter); 
    		if (!file.open(QIODevice::ReadOnly))
    		{
    			continue;
    		}
    
    		imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant(QString("form-data; name=\"params\"; filename=\"%1\"").arg(filInfo.fileName())));
    		imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/png"));
    
    		const auto& data = file.readAll();
    		imagePart.setBody(data);
    		imagePart.setHeader(QNetworkRequest::ContentLengthHeader, QVariant(data.size()));//注意要设定数据的大小，不然可能会少个字段
    		multiPart->append(imagePart);
    	}
    
    	QUrl url("http://test.com:80/test/postImages");
    	QNetworkRequest request(url);
    	QNetworkAccessManager manager;
    	QNetworkReply *reply = manager.post(request, multiPart);
    	multiPart->setParent(reply); // 析构reply的时候析构multiPart
    
    	QString strResp; // 服务端响应数据
    	QObject::connect(reply, &QNetworkReply::finished, [&reply, &strResp]
    	{
    		if (reply->error() == QNetworkReply::NoError)
    		{
    			strResp = reply->readAll();
    			qDebug() << "upload file finished";
    		}
    		else
    		{
    			strResp = reply->errorString();
    			qDebug() << "error string:" << reply->errorString();
    		}
    	});
    
    	QEventLoop eventLoop;//防止界面卡顿
    	QObject::connect(&manager, &QNetworkAccessManager::finished, [&]
    	{
    		eventLoop.quit();
    	});
    	eventLoop.exec();
    
    	reply->deleteLater();
    	return;
    }
    
    
    int main(int argc, char *argv[])
    {
    	QCoreApplication a(argc, argv);
    
    	uploadImages(QStringList());
    	return a.exec();
    }