WhyCan Forum(哇酷开发者社区)

#include <QCoreApplication>
#include <QDebug>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>

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

    qint32 fd;
    quint32 *mmaped = NULL;

    fd = open("/dev/fb0",O_RDWR);
    if(fd < 0 )
    {
        qDebug()<<"open fb0 fail";
        return 1;
    }
    /* 将文件映射至进程的地址空间 */
    mmaped = (quint32 *)mmap(NULL,480*272*4,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
    close(fd);
    if(mmaped == ((quint32 *)-1))
    {
        qDebug()<<"mmap fail";
        return 1;
    }
    for(quint32 i=0;i<480*272;i++)
    {
        mmaped[i] = 0x00ff0000;
    }

    msync(mmaped,480*272*4,MS_SYNC);

    return 0;
}