Windows doesn’t have an API to get a file size based on file name. This small function does that.
It returns -1 if a file doesn’t exist.
It doesn’t handle files > 2 GB (max positive number for 32 bit signed value). It’s quite easy to extend it to 64-bits if you know what is the 64 bit integer type in your compiler (unfortunately there’s no standard).
A better design might be
BOOL GetFileSize(const TCHAR *fileName, unsigned long *fileSizeOut) i.e. returning false if file doesn’t exist and putting the file size into
long GetFileSize(const TCHAR *fileName)
BOOL fOk; WIN32_FILE_ATTRIBUTE_DATA fileInfo;
if (NULL == fileName) return -1;
fOk = GetFileAttributesEx(fileName, GetFileExInfoStandard, (void*)&fileInfo); if (!fOk) return -1; assert(0 == fileInfo.nFileSizeHigh); return (long)fileInfo.nFileSizeLow;