我正在阅读这样的 tarfile:

fh = fopen(filename, "r");

if (fh == NULL) {
    printf("Unable to open %s.\n", filename);
    printf("Exiting.\n");
    return 1;
}

fseek(fh, 0L, SEEK_END);
filesize = ftell(fh);
fseek(fh, 0L, SEEK_SET);

filecontents = (char*)malloc(filesize + 1);     // +1 for null terminator

byteCount = fread(filecontents, filesize, 1, fh);
filecontents[filesize] = 0;

fclose(fh);

if (byteCount != filesize) {
    printf("Error reading %s.\n", filename);
    printf("Expected filesize: %ld bytes.\n", filesize);
    printf("Bytes read: %d bytes.\n", byteCount);
}

然后我继续解码 tarfile 的内容并提取其中存储的文件。一切正常,文件提取得很好,但 fread() 返回 1 而不是 filesize 。我得到的输出是:
Error reading readme.tar.
Expected filesize: 10240 bytes.
Bytes read: 1 bytes.

根据 CPP Reference on fread ,返回值应该是读取的字节数。

最佳答案

试试这个:

//byteCount = fread(filecontents, filesize, 1, fh);
byteCount = fread(filecontents, 1, filesize, fh);

关于c - fread 返回值 1 字节,即使文件被完全读取,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/15440671/

10-10 18:47