VxWorks中实现文件读写的示例代码

该示例代码展示了如何在VxWorks中实现文件的读写操作，包括打开文件、读取文件、写入文件和关闭文件等操作。代码中使用了基于文件描述符的API接口。

#include <stdio.h>
#include <ioLib.h>
#include <fcntl.h>
#include <errnoLib.h>

#define BUFFER_SIZE 512

void fileReadWriteDemo(const char* filename){

    char buffer[BUFFER_SIZE];
    int fd; //文件描述符
    int bytesRead, bytesWrite; 

    //打开文件，使用O_CREAT和O_RDWR参数表示读写操作，若文件不存在则创建
    fd = open(filename, O_CREAT|O_RDWR, 0666); 
    if (fd == ERROR){
        printf("Failed to open file %s, error code: %d\n", filename, errnoGet());
        return;
    }

    //将缓冲区中的数据写入文件
    bytesWrite = write(fd, (char*)buffer, strlen(buffer));
    if (bytesWrite == ERROR){
        printf("Failed to write file %s, error code: %d\n", filename, errnoGet());
        return;
    }

    //重新定位文件指针，指向文件开始
    lseek(fd, 0, SEEK_SET);

    //从文件中读取数据，并将数据存入缓冲区
    bytesRead = read(fd, (char*)buffer, sizeof(buffer));
    if (bytesRead == ERROR){
        printf("Failed to read file %s, error code: %d\n", filename, errnoGet());
        return;
    }

    //关闭文件
    close(fd);

    printf("File %s has been successfully read and written!\n", filename);
}

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

    if(argc!=2){
        printf("Please input correct filename!\n");
        return -1;
    }

    fileReadWriteDemo(argv[1]);
    return 0;
}

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