QT中将BMP的像素值写到txt文件中

以下是在QT中将BMP的像素值写入到txt文件中的示例代码：

#include <QCoreApplication>
#include <QFile>
#include <QDataStream>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QFile file("image.txt");
    if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
        return 0;

    QDataStream out(&file);
    out.setByteOrder(QDataStream::LittleEndian); // BMP文件使用小端字节序

    // 读取BMP文件头
    qint16 bfType;
    qint32 bfSize;
    qint16 bfReserved1;
    qint16 bfReserved2;
    qint32 bfOffBits;
    out >> bfType >> bfSize >> bfReserved1 >> bfReserved2 >> bfOffBits;

    // 读取BMP像素数据
    qint32 biSize;
    qint32 biWidth;
    qint32 biHeight;
    qint16 biPlanes;
    qint16 biBitCount;
    qint32 biCompression;
    qint32 biSizeImage;
    qint32 biXPelsPerMeter;
    qint32 biYPelsPerMeter;
    qint32 biClrUsed;
    qint32 biClrImportant;
    out >> biSize >> biWidth >> biHeight >> biPlanes
        >> biBitCount >> biCompression >> biSizeImage
        >> biXPelsPerMeter >> biYPelsPerMeter >> biClrUsed >> biClrImportant;

    // 根据像素深度读取BMP像素数据
    int pixelBytes = biBitCount / 8;
    char* pixelData = new char[biSizeImage];
    out.readRawData(pixelData, biSizeImage);

    // 将像素值写入txt文件中
    for (int y = 0; y < biHeight; y++) {
        for (int x = 0; x < biWidth; x++) {
            int index = y * biWidth + x;
            int b = *(pixelData + index * pixelBytes);
            int g = *(pixelData + index * pixelBytes + 1);
            int r = *(pixelData + index * pixelBytes + 2);
            QString pixel = QString("%1 %2 %3\n").arg(r).arg(g).arg(b);
            file.write(pixel.toUtf8());
        }
    }

    file.close();
    delete[] pixelData;

    return a.exec();
}

这段代码假设BMP文件使用小端字节序，并且像素深度为24位。如果你需要处理其他类型的BMP文件，你需要进行适当的修改。