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我编写了这个 void 函数来检查正在读取的输入文件是否有效，但有一件事我不知道如何实现。fseek 和 ftell 用于确定文件是否为空，但如果文件中包含空格或制表符，则将其视为不为空（尽管确实如此）。

输入文件将包含整数和/或字符串。那么有没有办法检查整个文件是否有任何整数或字符串或仅包含空格？

我想我可能不得不使用scanf_s或gets，以及isspace ...

FILE *inp;

/* Checks to see if file can be read */
errCode = fopen_s(&inp, file_location, "r");
if (errCode != 0) {
    printf(" ERROR. File %s was not located, ensure the following directory is valid: %s\n\n ", file_name, file_location);
    *file_Error = ERROR;
    return;
}

/*Move to end of file*/
fseek(inp, 0, SEEK_END);

/*Set filesize to size at end of file*/
fileSize = ftell(inp);

/*Print error and exit if filesize is zero i.e. contains 0 bytes (no data)*/
if (fileSize == 0) {
    fclose(inp);
    printf(" ERROR. File %s contains no data. (File size = %d bytes)\n\n ", file_name, fileSize);
    *file_Error = ERROR;
    return;
}

/*Print error and exit if filesize is zero for .dats containing only spaces or \t i.e. contains 0 bytes (no data)*/

/*Reset to beginning of file for reading*/
fseek(inp, 0, SEEK_SET);

/* Checks for error reading file occured */
if (errCode != 0) {
    printf(" Error opening file %s.\n\n ", file_name);
    *file_Error = ERROR;
    return;
}

/*if no error on file*/
else
{
    printf_s(" File %s Opened.\n\n", file_name);
    *file_Error = 0;
}
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