QColorDialog::getColor函数获取RGB值并转换为Hex

Question

谢谢回答，我更新了我的代码，但不是全部，我删除了一些仅前/后颜色设置的函数我尝试获取QColorDialog::getColorRGB值并将其转换为十六进制以下是建议和更新后的代码：

"mainwindow.cpp"
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QColorDialog>
#include <QColor>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
m_ui(new Ui::MainWindow),
m_serial(new QSerialPort(this))
{
m_ui->setupUi(
m_ui->ClearScreen_Button->setEnabled(false);
m_ui->SendFrontColor_Button->setEnabled(false);
m_ui->SendBackColor_Button->setEnabled(false);
m_ui->SetFrontColor_Button->setEnabled(false);
m_ui->SetBackColor_Button->setEnabled(false);
//
fc.clear();
fc.append(0xAA);
fc.append(0x02);
fc.append(0x03);
fc.append(0xFF);
fc.append(0xFF);
fc.append(0xFF);
fc.append(0xC3);
bc.clear();
bc.append(0xAA);
bc.append(0x03);
bc.append(0x03);
bc.append(static_cast<char>(0x00));
bc.append(static_cast<char>(0x00));
bc.append(static_cast<char>(0x00));
bc.append(0xC3);
}

MainWindow::~MainWindow()
{
delete m_ui;
}
void MainWindow::openSerialPort()
{
if (m_serial->open(QIODevice::ReadWrite))
{
//QByteArray b;
//b.clear();
//b.append(0xAA);
//b.append(0x20);
//b.append(0x01);
//b.append(static_cast<char>(0x00));
//b.append(0xC3);
//m_serial->write(b);
}//end if
}
void MainWindow::closeSerialPort()
{
if (m_serial->isOpen())
m_serial->close();
}

void MainWindow::on_ClearScreen_Button_clicked()
{
fc.clear();
fc.append(0xAA);
fc.append(0x02);
fc.append(0x03);
fc.append(0xFF);
fc.append(0xFF);
fc.append(0xFF);
fc.append(0xC3);
bc.clear();
bc.append(0xAA);
bc.append(0x03);
bc.append(0x03);
bc.append(static_cast<char>(0x00));
bc.append(static_cast<char>(0x00));
bc.append(static_cast<char>(0x00));
bc.append(0xC3);
//
QByteArray b;
b.clear();
b.append(0xAA);
b.append(0x02);
b.append(static_cast<char>(0x00));
b.append(0xC3);
m_serial->write(b);
}
void MainWindow::on_SendFrontColor_Button_clicked()
{
m_serial->write(fc);
}
void MainWindow::on_SendBackColor_Button_clicked()
{
m_serial->write(bc);
}
void MainWindow::on_SetFrontColor_Button_clicked()
{
FrontColor=QColorDialog::getColor(Qt::white,this,"Choose Front Color",QColorDialog::DontUseNativeDialog);
if(FrontColor.isValid())
{
fc.clear();
fc.append(0xAA);
fc.append(0x02);
fc.append(0x03);
fc.append(0xFF);
fc.append(0xFF);
fc.append(0xFF);
fc.append(0xC3);
QRgb rgb = FrontColor.rgb();
fc[5] = qRed(rgb);
fc[4] = qGreen(rgb);
fc[3] = qBlue(rgb);
}//end if
}
void MainWindow::on_SetBackColor_Button_clicked()
{
BackColor=QColorDialog::getColor(Qt::white,this,"Choose Back Color",QColorDialog::DontUseNativeDialog);
if(BackColor.isValid())
{
bc.clear();
bc.append(0xAA);
bc.append(0x03);
bc.append(0x03);
bc.append(static_cast<char>(0x00));
bc.append(static_cast<char>(0x00));
bc.append(static_cast<char>(0x00));
bc.append(0xC3);
QRgb rgb = BackColor.rgb();
bc[5] = qRed(rgb);
bc[4] = qGreen(rgb);
bc[3] = qBlue(rgb);
}//end if
}

Answer 1

您混淆了十六进制值和可视字符。

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
m_ui(new Ui::MainWindow),
m_serial(new QSerialPort(this))
{
m_ui->setupUi(this);
QPalette frontpalette = m_ui->label_FrontColor->palette();
frontpalette.setColor(m_ui->label_FrontColor->backgroundRole(), Qt::white);
m_ui->label_FrontColor->setAutoFillBackground(true);
m_ui->label_FrontColor->setPalette(frontpalette);
//    fc=("AA 02 03 FF FF FF C3");
fc.clear();
fc.append(static_cast<char>(0xAA));
fc.append(static_cast<char>(0x02));
fc.append(static_cast<char>(0x03));
fc.append(static_cast<char>(0xFF));
fc.append(static_cast<char>(0xFF));
fc.append(static_cast<char>(0xFF));
fc.append(static_cast<char>(0xC3));
}
MainWindow::~MainWindow()
{
delete m_ui;
}
void MainWindow::on_SetFrontColor_Button_clicked()
{
FrontColor=QColorDialog::getColor(Qt::white,this,"Choose Front Color",QColorDialog::DontUseNativeDialog);
if(FrontColor.isValid())
{
QPalette palette = m_ui->label_FrontColor->palette();
palette.setColor(m_ui->label_FrontColor->backgroundRole(), FrontColor);
m_ui->label_FrontColor->setAutoFillBackground(true);
m_ui->label_FrontColor->setPalette(palette);
QRgb rgb = FrontColor.rgb();
fc[3] = static_cast<char>(qRed(rgb));
fc[4] = static_cast<char>(qGreen(rgb));
fc[5] = static_cast<char>(qBlue(rgb));
}//end if
}
void MainWindow::on_SendFrontColor_Button_clicked()
{
m_serial->write(fc);
}