void IPv4AddressToString(IPv4Address address, std::u16string& buffer)
{
const char* const InvalidIPv4AddressStr = "Invalid IPv4 address!";
const auto& addressBytes = address.Bytes;
const in_addr addr = { static_cast<uchar>(addressBytes[0]), static_cast<uchar>(addressBytes[1]),
static_cast<uchar>(addressBytes[2]), static_cast<uchar>(addressBytes[3]) };
const auto& ntFunctions = GetNtFunctions();
//If the length of the buffer pointed to by the AddressString parameter is not large enough
//to receive the string representation of the IPv4 address and port, RtlIpv4AddressToStringEx
//returns ERROR_INVALID_PARAMETER and sets the AddressStringLength parameter to the buffer length required.
ulong bufferLength = {};
auto errCode = ntFunctions.RtlIpv4AddressToStringEx(&addr, 0, nullptr, &bufferLength);
//如果 bufferLength 在调用后依旧为 0 说明 address 有问题。
Try<std::invalid_argument>(bufferLength == 0, InvalidIPv4AddressStr);
buffer.resize(static_cast<std::size_t>(bufferLength));
errCode = ntFunctions.RtlIpv4AddressToStringEx(&addr, 0, reinterpret_cast<wchar_t*>(&buffer[0]), &bufferLength);
//如果有错误，前面必然已经抛出异常，故这里必然是 Success。
assert(errCode == NtFunctions::NtSuccess);
assert(bufferLength > 0);
//在写入的 buffer 中包含 '\0'，会导致判等出现奇怪的结果，故舍弃掉结尾的空字符。
buffer.pop_back();
}
void LineEdit::IntValidator::assign(std::u16string &string,
const std::u16string &arg) const {
if(arg.size()==0){
if(string.size()==0){
string.resize(1);
string[0] = '0';
}
return;
}
bool good=true;
if(arg[0]=='-'){
if(arg.size()!=1){
if(arg[1]=='0' && arg.size()!=2)
good=false;
for(size_t i=1; good && i<arg.size(); ++i ){
const char16_t c = arg[i];
good &= ('0'<=c && c<='9');
}
} else {
good = false;
}
} else {
if(arg[0]=='0' && arg.size()!=1)
good=false;
for(size_t i=0; good && i<arg.size(); ++i ){
const char16_t c = arg[i];
good &= ('0'<=c && c<='9');
}
}
if(good){
string = arg;
} else {
if(string.size()==0){
string.resize(1);
string[0] = '0';
}
}
}
void IPv6AddressToString(IPv6Address address, std::uint32_t scopeId, std::u16string& buffer)
{
const char* const InvalidIPv6AddressStr = "Invalid IPv6 address!";
::in6_addr v6Addr;
auto& desAddrBytes = v6Addr.s6_addr;
auto& srcAddrBytes = address.Bytes;
for (std::size_t i = 0; i < kIPv4AddressBytes; ++i)
desAddrBytes[i] = static_cast<uchar>(srcAddrBytes[i]);
const auto& ntFunctions = GetNtFunctions();
ulong bufferLength = {};
auto errCode = ntFunctions.RtlIpv6AddressToStringEx(&v6Addr, static_cast<ulong>(scopeId), 0, nullptr, &bufferLength);
Try<std::invalid_argument>(bufferLength != 0, InvalidIPv6AddressStr);
buffer.resize(static_cast<std::size_t>(bufferLength));
errCode = ntFunctions.RtlIpv6AddressToStringEx(&v6Addr, static_cast<ulong>(scopeId), 0, reinterpret_cast<wchar_t*>(&buffer[0]), &bufferLength);
assert(errCode == NtFunctions::NtSuccess);
buffer.pop_back();
}