- 1 year ago
fstream gives me wrong file size
If you're experiencing issues with fstream
giving you wrong file sizes, it's likely due to incorrect usage or limitations of the fstream
library. Here are a few things to consider:
Open Mode: Ensure that you're opening the file in the correct mode when using
fstream
. If you want to read the file and get its size, you should open it in binary mode (std::ios::binary
).cppstd::fstream file("filename.txt", std::ios::in | std::ios::binary);
Check File Open: Verify that the file is opened successfully before attempting to read its size. You can use the
is_open()
function to check if the file is open.cppstd::fstream file("filename.txt", std::ios::in | std::ios::binary);
if (!file.is_open()) {
// Handle file open error
}
Seek to End: To get the file size, you need to seek to the end of the file using the
seekg()
function with an offset of 0 relative to the end of the file.cppfile.seekg(0, std::ios::end);
Get Position: After seeking to the end of the file, you can get the current position using the
tellg()
function, which gives you the size of the file.cppstd::streampos fileSize = file.tellg();
Close File: Don't forget to close the file after you've finished working with it.
cppfile.close();
By following these steps, you should be able to correctly determine the size of a file using fstream
. If you're still experiencing issues, please provide a code snippet or more specific details so that we can help you further.