c++ - Uploading Images, Videos and Zip becomes "Unable to Preview" / "Invalid" -


i can't see similar problem here why made topic.

i making qt c++ application using dropbox core rest api. have no problems authenticating, can upload problem types being invalid after uploaded image files, video files , zips, weird pdfs , mp3 doesn't invalid.

[code - qt c++ code uploading]

// ----- javascript  var params                      = new object(); params.url          = "https://api-content.dropbox.com/1/files_put/"+currentpath+"/"+basefilename+"?access_token=" + dropboxaccesstoken params.filename         = filename; params.basefilename     = basefilename; params.endpoint         = "dropboxupload"; uploader.uploaddropbox(params);  // ----- cpp  qvariantmap paramsmap   = params.tomap();  const qstring endpoint      = paramsmap.value("endpoint").tostring(); const qstring filename      = paramsmap.value("filename").tostring(); const qstring basefilename  = paramsmap.value("basefilename").tostring(); const qstring theurl        = paramsmap.value("url").tostring();  qhttpmultipart *multipart = new qhttpmultipart();  qhttppart filepart; qfile *file = new qfile(filename); file->open(qiodevice::readonly); filepart.setbodydevice(file); file->setparent(multipart); multipart->append(filepart);  qurl urlquery(theurl); qnetworkrequest request(urlquery);  qnetworkreply *reply = networkaccessmanager.post(request, multipart); reply->setproperty("endpoint", endpoint); multipart->setparent(reply); connect (reply, signal(finished()), this, slot(oncomplete()));

[image - highlighted files fine, rest invalid files when opened] enter image description here

[image - unable preview] enter image description here

[image - pdf file opened without problems] enter image description here

any suggestions please?

i have solved problem

qvariantmap paramsmap   = params.tomap();  const qstring endpoint      = paramsmap.value("endpoint").tostring(); const qstring filename      = paramsmap.value("filename").tostring(); const qstring basefilename  = paramsmap.value("basefilename").tostring(); const qstring theurl        = paramsmap.value("url").tostring();  qhttppart filepart; qfile *file = new qfile(filename); file->open(qiodevice::readonly);  qurl urlquery(theurl); qnetworkrequest request(urlquery);  qnetworkreply *reply = networkaccessmanager.put(request, file->readall()); reply->setproperty("endpoint", endpoint); connect (reply, signal(finished()), this, slot(oncomplete()));

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