fopen函数“const char *mode”参数选项。

结果：

标准库c写入结构体到文件：

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

struct Test
{
        int a;
        char c;
};

int main()
{
        FILE *fp;

        struct Test data[2] = {{100,'a'},{101,'b'}};
        struct Test data2[2];

        fp = fopen("./file1","w+");

        int n_write = fwrite(&data,sizeof(struct Test)*2,1,fp);
        fseek(fp,0,SEEK_SET);

        int n_read = fread(&data2,sizeof(struct Test)*2,1,fp);

        printf("fread %d,%c\n",data2[0].a,data2[0].c);
        printf("fread %d,%c\n",data2[1].a,data2[1].c);

        fclose(fp);

        return 0;
}

fputc()函数运用 

#include <stdio.h>
#include <string.h>

main()
{
        FILE *fp;
        int i;
        char *str = "win!!!";
        int len = strlen(str);

        fp = fopen("./test.txt","w+");
        for(i=0;i<len;i++){
//      int fputc(int c, FILE *stream);
                fputc(*str,fp);
                str++;
        }
        fclose(fp);

        return 0;
}

结果：