我正在與一個使用 Qt 的 C 專案團隊合作。作為我們專案的一部分，我們必須能夠檢索法國任何給定地址的坐標。法國政府提供了一個 API 來為我們處理。
對 API 的呼叫如下所示：
curl -X POST -F data=@path/to/file.csv https://api-adresse.data.gouv.fr/search/csv/
這是我寫的代碼：
int main (int argc, char* argv[]){
QCoreApplication app(argc, argv);
QNetworkAccessManager man;
QUrl url("https://api-adresse.data.gouv.fr/search/csv/");
QNetworkRequest req(url);
QFile inputFile("<path_to_search.csv>");
inputFile.open(QIODevice::ReadOnly);
QByteArray data = inputFile.readAll();
QNetworkReply* reply = man.post(req, "data=" data);
QObject::connect(reply, &QNetworkReply::finished, [&](){
QByteArray read = reply->readAll();
std::cout << "Reading Data:" << std::endl;
std::cout << read.toStdString() << std::endl;
reply->close();
reply->deleteLater();
app.quit();
});
return app.exec();
}
服務器回復
{"code":400,"message":"A CSV file must be provided in data field"}
很明顯，我錯誤地轉發了表格。我應該如何進行？
uj5u.com熱心網友回復：
要通過表單發送資訊，我不知道查詢部分，但您想使用 QHttpMultiPart，就像我在這篇舊帖子中展示的那樣。適用于您的情況，解決方案是：
#include <QCoreApplication>
#include <QFile>
#include <QHttpMultiPart>
#include <QNetworkAccessManager>
#include <QNetworkReply>
QHttpMultiPart *buildMultpart(const QVariantMap & data, const QMap<QString, QString> filenames){
QHttpMultiPart *multipart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
QVariantMap::const_iterator i_data = data.constBegin();
while (i_data != data.constEnd()) {
QHttpPart postpart;
postpart.setHeader(QNetworkRequest::ContentDispositionHeader, QString("form-data; name=\"%1\"").arg(i_data.key()));
postpart.setBody(i_data.value().toByteArray());
multipart->append(postpart);
i_data;
}
QMap<QString, QString>::const_iterator i_filenames = filenames.constBegin();
while (i_filenames != filenames.constEnd()) {
QFile *file = new QFile(i_filenames.value());
if(!file->open(QIODevice::ReadOnly)){
delete file;
continue;
}
QHttpPart postpart;
postpart.setHeader(QNetworkRequest::ContentDispositionHeader,
QString("form-data; name=\"%1\"; filename=\"%2\"")
.arg(i_filenames.key(), file->fileName()));
postpart.setBodyDevice(file);
multipart->append(postpart);
file->setParent(multipart);
i_filenames;
}
return multipart;
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QNetworkAccessManager manager;
QNetworkRequest request;
QUrl url("https://api-adresse.data.gouv.fr/search/csv/");
request.setUrl(url);
QMap<QString, QString> filenames;
filenames["data"] = "/path/of/file.csv";
QHttpMultiPart *multipart = buildMultpart({}, filenames);
QNetworkReply *reply = manager.post(request, multipart);
multipart->setParent(reply);
QObject::connect(reply, &QNetworkReply::finished, [reply](){
if(reply->error() == QNetworkReply::NoError){
qDebug().noquote() << reply->readAll();
}
else{
qDebug() << reply->error() << reply->errorString();
}
reply->deleteLater();
QCoreApplication::quit();
});
return a.exec();
}
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