I tried two methods:
1.
void CryptoHashes::makeFileHash(const QString &filePath)
{
FileSource f(filePath.toStdString().c_str(), true, new HashFilter(hash, new
HexEncoder(new StringSink(digest))));
}
2.
void CryptoHashes::makeFileHash(const QString &filePath)
{
std::filesystem::path _path {
std::filesystem::u8path(filePath.toStdString()) };
std::ifstream m_file(_path, std::ios::in);
FileSource f(m_file, true, new HashFilter(hash, new HexEncoder(new
StringSink(digest))));
}
the only exception is that when I tried method 2, it always calculated hash
of NULL, no matter which file I selected.
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