写入 txt 文件的数据以某种奇怪的语言出现 [C]

您正在将这些值写入文件：

int fposition;
int fIdKey;
char ftitle[50];
char fgenre[50];
int fyear;

But you are displaying the whole file as characters. That kind of works for ftitle and fgenre because they really are characters...though since you don't populate all 50 characters there are some ugly uninitialized characters shown as well. That is easy to fix: just fill the unused characters (as well as the null terminator) with some known character (such as space) before writing to the file, or do not write the unused characters at all. You can use strlen() to find the length of each string and memset() to set the unused characters to a well-known character which is printable.

Next, saving an int and reading it as text is problematic. You need to decide on a single format. Either you write as integers like now, and you read as integers (which means you need a special program to read the file), or you commit to writing only text to the file.

Easiest might be to only write text to the file. You can use fprintf() for that, instead of fwrite(). You can use fprintf() for the character arrays as well, it will automatically write only the "used" part of each string up to the null terminator, skipping all the "garbage" characters.