问C++ getline()函数未按预期工作

EN

int boardDim(ifstream & inputFile, unsigned int x, unsigned int y) {
    inputFile.open("test.txt");
    if (!(inputFile.is_open())) {
        throw fileNotOpen;
    }
    else {
        stringstream output;
        string output1;
        if (getline(inputFile, output1)) {
            output << output1;
            if (output >> x) {
                if (output >> y) {
                    return success;
                }
                return secBoardVarErr;
            }
            return firstBoardVarErr;
        }
        return lineErr;
    }
    cout << x << endl;
    cout << y << endl;
}