1.概要
想用数据绘制一个画面，看有相机到播放的本质是啥。
要点
// 创建一个QImage对象，指定图像的宽度、高度和格式
QImage image(width, height, QImage::Format_Grayscale8);
// 将像素数据复制到QImage对象中
memcpy(image.bits(), pixelData, width * height * sizeof(unsigned char));
// 将 QImage 转换为 QPixmap
QPixmap pixmap = QPixmap::fromImage(image);
// 设置 QLabel 的 pixmap
ui->label->setPixmap(pixmap.scaled(200, 200, Qt::KeepAspectRatio, Qt::SmoothTransformation));
2.代码
#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);
}Widget::~Widget()
{delete ui;
}void Widget::on_pushButton_clicked()
{unsigned char pixelData[128*50]; // 示例数据for(int i=0;i<(128*50);i++){if(i%128<50||i%128>100){pixelData[i] = 0x00;}else{pixelData[i] = 0xff;}}int width = 128; // 图像的宽度int height = 50; // 图像的高度// 创建一个QImage对象，指定图像的宽度、高度和格式QImage image(width, height, QImage::Format_Grayscale8);// 将像素数据复制到QImage对象中memcpy(image.bits(), pixelData, width * height * sizeof(unsigned char));// 假设你已经有了一个 QImage 对象，这里我们创建一个示例 QImage//QImage image(100, 100, QImage::Format_ARGB32);//image.fill(Qt::blue); // 填充为蓝色，仅作为示例// 将 QImage 转换为 QPixmapQPixmap pixmap = QPixmap::fromImage(image);// 设置 QLabel 的 pixmapui->label->setPixmap(pixmap.scaled(200, 200, Qt::KeepAspectRatio, Qt::SmoothTransformation));
}#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();private slots:void on_pushButton_clicked();private:Ui::Widget *ui;
};
#endif // WIDGET_H
#include "widget.h"#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;w.show();return a.exec();
}
QT += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++17# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \widget.cppHEADERS += \widget.hFORMS += \widget.ui# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
3.运行效果
