Question

我试图把Stdin写成文件但不知为何,我读了零字节

来源:

#include <stdio.h>
#include <stdlib.h>

#define BUF_SIZE 1024

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

    if (feof(stdin))
        printf("stdin reached eof
");

    void *content = malloc(BUF_SIZE);

    FILE *fp = fopen("/tmp/mimail", "w");

    if (fp == 0)
        printf("...something went wrong opening file...
");

    printf("About to write
");
    int read;
    while ((read = fread(content, BUF_SIZE, 1, stdin))) {
        printf("Read %d bytes", read);
        fwrite(content, read, 1, fp);
        printf("Writing %d
", read);
    }
    if (ferror(stdin))
        printf("There was an error reading from stdin");

    printf("Done writing
");

    fclose(fp);

    return 0;
}

我正在运行 cct test.c\\ \ \ \ / test 并且输出只是

About to write
Done writing

似乎读了零字节虽然我有很多东西

Answer 1

您已经将两个整数参数颠倒到 fread () 。您再次告诉它要填充缓冲一次, 或者失败。相反, 您想要告诉它读取单个字符, 最多1024次。反转两个整数参数, 它会按设计工作。

友情链接