GetTempFileName 创建一个空文件

Question

i'm not sure if i'm the first one to notice this, but (lol, it's kinda funny...) when ever i make a call (i debugged the application to verify this) GetTempFileName (from the Windows.pas unit), it creates an empty (0 byte) file in my D:\\ (no idea why there) drive...

i have 2 logical drives... C:\\ (Primary) and D:\\ (Logical), now this ONLY happens if i call it when the first argument (arg0) is just a dot ('.'), which is weird to me that it creates it in D:\\ since parent directory is 2 dots ('..').

anyways, a dummy bypass for this is to just delete the newely created file... -_-, all i need is the file NAME, not the file system itself...

Edit1: My question is, why is this happening ? and is there a way to avoid the call from creating a new empty file ?

// Creates a name for a temporary file.
Function GetTempFileName(const ext: string): string;
var
  // This buffer should be MAX_PATH characters to accommodate the path plus the terminating null character.
  lpTempFileName: Array[0..MAX_PATH] of char;
begin
  // If uUnique is zero, GetTempFileName creates an empty file and closes it.
  // If uUnique is not zero, you must create the file yourself. Only a file name is created
  Windows.GetTempFileName('.', nil, 0, lpTempFileName);
  DeleteFile(lpTempFileName); // delete created file
  Result := ChangeFileExt(lpTempFileName, ext);
  Delete(Result, 1, 2); // ".\"
end;

Answer 1

Why does GetTempFileName function create new empty file ?

It's in the GetTempFileName function description (emphasized by me):

Creates a name for a temporary file. If a unique file name is generated, an empty file is created and the handle to it is released; otherwise, only a file name is generated.

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How to avoid creating the new file when using GetTempFileName function ?

Either you can't let the function generate a unique file name (which creates an empty file) or just delete that created empty file after the GetTempFileName function returns. From the reference (emphasized by me):

Temporary files whose names have been created by this function are not automatically deleted. To delete these files call DeleteFile .