ESP32CAM+QT实现简易监控

核心代码：

void MainWindow::httpResponse()
{
    // 打印接收内容
    QByteArray buffer = m_httpClient->readAll();
    const QString startKey = "Content-Type: image/jpeg\r\nContent-Length: ";
    const QString endKey = "\r\n--123456789000000000000987654321\r\n";
    const QString splitKey = "\r\n\r\n";
    int startPos = buffer.indexOf(startKey);
    int endPos = buffer.indexOf(endKey);
    if (startPos >= 0 && endPos >= 0) {
        if (startPos < endPos) {
            QByteArray lastFrame = buffer.mid(0, startPos);
            frameBuffer.append(lastFrame);
            // 显示
            this->showPixmap(frameBuffer);
            frameBuffer.clear();
            int splitPos = buffer.indexOf(splitKey, startPos) + splitKey.size();
            QByteArray currentFrame = buffer.mid(splitPos, endPos - splitPos);
            frameBuffer.append(currentFrame);
            // 显示
            this->showPixmap(frameBuffer);
            frameBuffer.clear();
            QByteArray nextFrame = buffer.mid(endPos + endKey.size());
            frameBuffer.append(nextFrame);
        } else {
            QByteArray lastFrame = buffer.mid(0, endPos);
            frameBuffer.append(lastFrame);
            // 显示
            this->showPixmap(frameBuffer);
            frameBuffer.clear();
            int splitPos = buffer.indexOf(splitKey, startPos) + splitKey.size();
            QByteArray nextFrame = buffer.mid(splitPos);
            frameBuffer.append(nextFrame);
        }
        return;
    }
    if (startPos >= 0) {
        QByteArray lastFrame = buffer.mid(0, startPos);
        frameBuffer.append(lastFrame);
        // 显示
        this->showPixmap(frameBuffer);
        frameBuffer.clear();
        int splitPos = buffer.indexOf(splitKey, startPos);
        QByteArray nextFrame = buffer.mid(splitPos + splitKey.size());
        frameBuffer.append(nextFrame);
        return;
    }
    if (endPos >= 0) {
        QByteArray lastFrame = buffer.mid(0, endPos);
        frameBuffer.append(lastFrame);
        // 显示
        this->showPixmap(frameBuffer);
        frameBuffer.clear();
        QByteArray nextFrame = buffer.mid(endPos + endKey.size());
        frameBuffer.append(nextFrame);
        return;
    }
    frameBuffer.append(buffer);
}