Question

我设计了一个应用程序是C ++ / Qt，用于在我的Mac和Android设备之间传输文件。

要做到这一点，我创建了一个类QDialog，如下所示：

dialog.cpp

Dialog::Dialog(QWidget *parent)
    : QWidget(parent)
{
}

void Dialog::CreateProgressBar() {
    ProgressDialog = new QWidget(this);
    ProgressDialog->setWindowTitle("Progress");

    ProgressLayout = new QVBoxLayout(this);

    ProgressIndicator = new QProgressBar();
    ProgressIndicator->resize(200,25);
    ProgressIndicator->setValue(0);
    ProgressIndicator->setOrientation(Qt::Horizontal);
    //connect(this,SIGNAL(ProgressBar(const uint64_t, const uint64_t, void const * const)),ProgressIndicator,SLOT(setValue(int)));

    CancelButton = new QPushButton();
    CancelButton->setFixedSize(25,25);
    CancelButton->setText("Cancel");
    CancelButton->setFlat(true);
    CancelButton->setAutoFillBackground(true);
    CancelButton->setStyleSheet("QPushButton { background-color : white;}");
    connect(CancelButton, SIGNAL(clicked()), this, SLOT(onCancelButtonAction()));

    ProgressLayout->addWidget(ProgressIndicator);
    ProgressLayout->addWidget(CancelButton);

    ProgressDialog->setLayout(ProgressLayout);
    ProgressDialog->show();
}

void Dialog::setValue(const uint64_t value) {
    ProgressIndicator->setValue(value);
}

void Dialog::DestroyProgressBar() {
    ProgressDialog->close();
}

dialog.h

class Dialog : public QWidget
{
    Q_OBJECT
public:
    Dialog(QWidget *parent = 0);
    /* ProgressIndicator */
    //int ProgressBar(const uint64_t data_sent, const uint64_t data_total, void const * const data);
    void CreateProgressBar();
    void DestroyProgressBar();
    int createOverwriteDialogBox(char* filename);
    void setValue(const uint64_t value);
    void WaitBoxDialog();
    void DestroyWaitBoxDialog();

private:
    QWidget *ProgressDialog;
    QProgressBar *ProgressIndicator;
    QVBoxLayout *ProgressLayout;

    QPushButton *CancelButton;

要显示它，我目前有一个名为wrapper.cpp的源代码，它负责管理副本。

管理复制时，以及在核对API LIBMTP_Send_File_to_File之前，我开始进行方法实例化。

   Dialog *MyProgress = new Dialog();

MyProgress->CreateProgressBar();
genfile = LIBMTP_new_file_t();


   LIBMTP_Send_File_From_File(PulsDeviceMngr->device, strdup(AbsolutePath), genfile, NULL, NULL);//ProgressBar, MyProgress);

LIBMTP_destroy_file_t(genfile);


MyProgress->DestroyProgressBar();
//delete MyProgress;
}

我仍然不明白为什么我看不到对话框。

Answer 1

我认为你需要两个线程，一个用于处理，另一个用于保持GUI运行。像这样：

#include <QFutureWatcher>
#include <QMetaObject>
#include <QtConcurrent/QtConcurrentRun>

void sendFile()
{
    LIBMTP_Send_File_From_File(PulsDeviceMngr->device, strdup(AbsolutePath), genfile, NULL, NULL);
    QMetaObject::invokeMethod(MyProgress, "setValue", Q_ARG(int, 50));
    LIBMTP_destroy_file_t(genfile);
}

MyProgress->CreateProgressBar();
QFutureWatcher<void> futureWatcher;
connect(futureWatcher, SIGNAL(finished()), MyProgress, SLOT(DestroyProgressBar()));
futureWatcher.setFuture(QtConcurrent::run(sendFile));

当然，您需要制作setValue和DestroyProgressBar公共广告位。

无法显示QDialog / QProgressbar

1 个答案: