fopen在linux中失败，但在Windows中工作 [英] fopen fails in linux but works in windows

问题描述

当我运行下面的代码时，它在Linux中失败，但Windows没有问题.文件名类似于"src/folder/file"

when i run the code below it fails in linux but no problem with windows. filename is something like "src/folder/file"

char* loadProgSource(const char* filename, size_t* finalLength)
{
    char* returnStr;
    FILE* file = fopen(filename, "rb");
    if(file == NULL) return NULL;

    fseek(file, 0, SEEK_END);
    *finalLength = ftell(file);
    fseek(file, 0, SEEK_SET);

    returnStr = (char*) malloc(*finalLength+1);

    if(fread(returnStr, sizeof(char), *finalLength, file) != *finalLength) {
        fclose(file);
        free(returnStr);
        return NULL;
    }
    returnStr[*finalLength] = '\0';

    return returnStr;
}

推荐答案

不仅用于调试，还可以在系统命令失败的情况下使用 perror().

Not only for debugging use perror() in case a system command failed.

您可以这样修改代码:

...

if (file == NULL) 
{
    perror("fopen");
    return NULL;
}

...

returnStr = malloc(*finalLength+1); /* note that casting 'malloc()' is not necessary and also not recommended uin C */
if (!returnStr)
{
  perror("malloc");
  return NULL;
}

...

if (fread(returnStr, sizeof(char), *finalLength, file) != *finalLength) 
{
  perror("fread");
  ...

作为练习，在对 fseek()， ftell()和 fclose()的调用中添加错误检查.

Adding error checking on the calls to fseek(), ftell() and fclose() is left as an exercise.

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