qt|Qt_共享内存（QSharedMemory）未完成 ui|开发语言|qt

共享段初始化ID

Dialog::Dialog(QWidget *parent) : QDialog(parent) , sharedMemory("QSharedMemoryExample") { ui.setupUi(this); connect(ui.loadFromFileButton, &QPushButton::clicked, this, &Dialog::loadFromFile); connect(ui.loadFromSharedMemoryButton, &QPushButton::clicked, this, &Dialog::loadFromMemory); setWindowTitle(tr("SharedMemory Example")); }

加载内容并将内容上传到共享段中

void Dialog::loadFromFile() { if (sharedMemory.isAttached()) detach(); ui.label->setText(tr("Select an image file")); QString fileName = QFileDialog::getOpenFileName(0, QString(), QString(), tr("Images (*.png *.xpm *.jpg)")); QImage image; if (!image.load(fileName)) { ui.label->setText(tr("Selected file is not an image, please select another.")); return; } ui.label->setPixmap(QPixmap::fromImage(image)); //! [1] //! [2]// load into shared memory QBuffer buffer; buffer.open(QBuffer::ReadWrite); QDataStream out(&buffer); out << image; int size = buffer.size(); if (!sharedMemory.create(size)) { ui.label->setText(tr("Unable to create shared memory segment.")); return; } sharedMemory.lock(); char *to = (char*)sharedMemory.data(); const char *from = buffer.data().data(); memcpy(to, from, qMin(sharedMemory.size(), size)); sharedMemory.unlock(); }

【qt|Qt_共享内存（QSharedMemory）未完成】从共享段中获取内容

void Dialog::loadFromMemory() { if (!sharedMemory.attach()) { ui.label->setText(tr("Unable to attach to shared memory segment.\n" \ "Load an image first.")); return; }QBuffer buffer; QDataStream in(&buffer); QImage image; sharedMemory.lock(); buffer.setData((char*)sharedMemory.constData(), sharedMemory.size()); buffer.open(QBuffer::ReadOnly); in >> image; sharedMemory.unlock(); sharedMemory.detach(); ui.label->setPixmap(QPixmap::fromImage(image)); }