传统的DNS配置文件（/etc/resolv.conf）中写入的地址是127.0.0.53，直接更改这个地址是没用的，重启还会恢复成127.0.0.53。

正确的做法是在网络配置文件里直接修改，路径是/etc/netplan/*.yaml。

New in version 3.15.

Select the MSVC runtime library for use by compilers targeting the MSVC ABI.

The allowed values are:

MultiThreaded


Compile with -MT or equivalent flag(s) to use a multi-threaded statically-linked runtime library.

MultiThreadedDLL


Compile with -MD or equivalent flag(s) to use a multi-threaded dynamically-linked runtime library.

MultiThreadedDebug


Compile with -MTd or equivalent flag(s) to use a multi-threaded statically-linked runtime library.

MultiThreadedDebugDLL


Compile with -MDd or equivalent flag(s) to use a multi-threaded dynamically-linked runtime library.

The value is ignored on non-MSVC compilers but an unsupported value will be rejected as an error when using a compiler targeting the MSVC ABI.

cmake_minimum_required(VERSION 3.15)
cmake_policy(SET CMP0091 NEW)
project(my_project)

add_executable(foo foo.c)
set_property(TARGET foo PROPERTY
             MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")

bool utf8_to_utf16(const char *fpath)
{
    bool ret = false;
    HANDLE fileHandle;
    DWORD fileSize;
    PCHAR fileBuffer = nullptr;
    char16_t* utf16Buffer = nullptr;
    DWORD numberOfBytesRead;
    DWORD numberOfBytesWritten;
    fileHandle = ::CreateFileA(fpath,GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
    if (fileHandle == INVALID_HANDLE_VALUE)
        return false;
    do
    {
        fileSize = ::GetFileSize(fileHandle,NULL);
        if (fileSize == 0)
            break;
        fileBuffer = new (std::nothrow) CHAR[fileSize];
        if (fileBuffer == nullptr)
            break;
        if (::ReadFile(fileHandle,fileBuffer,fileSize,&numberOfBytesRead,NULL) == FALSE)
            break;
        int result = ::MultiByteToWideChar(
          CP_UTF8,       // Source string is in UTF-8
          MB_PRECOMPOSED | MB_ERR_INVALID_CHARS,        // Conversion flags
          fileBuffer,   // Source UTF-8 string pointer
          fileSize,    // Length of source UTF-8 string, in chars
          NULL,     // Pointer to destination buffer
          0    // Size of destination buffer, in wchar_ts
        );
        if (result == 0)
            break;
        utf16Buffer = new (std::nothrow) char16_t[result];
        if (utf16Buffer == nullptr)
            break;
        result = ::MultiByteToWideChar(
          CP_UTF8,       // Source string is in UTF-8
          MB_PRECOMPOSED | MB_ERR_INVALID_CHARS,        // Conversion flags
          fileBuffer,   // Source UTF-8 string pointer
          fileSize,    // Length of source UTF-8 string, in chars
          (LPWSTR)utf16Buffer,     // Pointer to destination buffer
          result    // Size of destination buffer, in wchar_ts
        );
        if (result == 0)
            break;
        if (::SetFilePointer(fileHandle,0,NULL,FILE_BEGIN) == FALSE)
            break;
        if (::WriteFile(fileHandle,"\xFF\xFE",2,&numberOfBytesWritten,NULL) == FALSE || numberOfBytesWritten !=2 )
            break;
        if (::WriteFile(fileHandle,utf16Buffer,result * sizeof(char16_t),&numberOfBytesWritten,NULL) == FALSE || numberOfBytesWritten != result * sizeof(char16_t))
            break;
        if (::SetEndOfFile(fileHandle) == FALSE)
            break;
        ret = true;
    }while(0);
    if (utf16Buffer)
        delete utf16Buffer;
    if (fileBuffer)
        delete fileBuffer;
    ::CloseHandle(fileHandle);
    return ret;
}

当我们移动hyper-v虚拟机到新磁盘后，启动虚拟机是会出现下面的提示，意思就是虚拟机的磁盘文件没有权限，只需要用命令行给虚拟磁盘文件添加权限即可解决。

icacls "C:\testvm\testvm\Virtual Hard Disks\testvm.vhdx" /grant "NT VIRTUAL MACHINE\3C910E28-7885-4BF4-94A5-AC9EA3F62796":(F)

Windows

Windows自带的X550驱动是支持2.5G、5G自动协商的，但是较新的intel官方驱动是不支持的。这会导致使用较新的intel驱动时，X550网卡插在2.5G交换机上，会反复丢失连接（网卡在红叉和连线状态反复横跳）。在Windows平台上解决起来比较方便，直接在网卡设置里设定速度就可以了。

Linux

root@truenas[/]# cd /etc/network
root@truenas[/etc/network]# ls
if-down.d  if-post-down.d  if-pre-up.d  if-up.d  interfaces  interfaces.d
root@truenas[/etc/network]# cat interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source /etc/network/interfaces.d/*
auto enp5s0f0
iface enp5s0f0 inet dhcp
pre-up ethtool -s enp5s0f0 advertise 0x1800000001028 || true
auto enp5s0f1
iface enp5s0f1 inet dhcp
pre-up ethtool -s enp5s0f1 advertise 0x1800000001028 || true
root@truenas[/etc/network]# 

DWORD GetServicePid(PSTR ServiceName)
{
	SC_HANDLE ScmHandle;
	SC_HANDLE SvcHandle;
	SERVICE_STATUS_PROCESS ServiceStatusProcess;
	DWORD cbBytesNeeded;

	ScmHandle = OpenSCManagerA(NULL, NULL, SC_MANAGER_CONNECT);
	if (ScmHandle)
	{
		SvcHandle = OpenServiceA(ScmHandle, ServiceName, SERVICE_QUERY_STATUS);
		if (SvcHandle)
		{
			if (QueryServiceStatusEx(SvcHandle, SC_STATUS_PROCESS_INFO, (LPBYTE)&ServiceStatusProcess, sizeof(ServiceStatusProcess), &cbBytesNeeded))
			{
				CloseServiceHandle(SvcHandle);
				CloseServiceHandle(ScmHandle);
				return ServiceStatusProcess.dwProcessId;
			}
			CloseServiceHandle(SvcHandle);
		}
		CloseServiceHandle(ScmHandle);
	}
	return 0;
}

全部都是编译为静态库，具体分为动、静态链接C库的Debug版和一个静态链接C库的Release版。

b2 toolset=msvc-14.3 -–layout=versioned variant=debug link=static threading=multi runtime-link=shared
b2 toolset=msvc-14.3 -–layout=versioned variant=debug link=static threading=multi runtime-link=static
b2 toolset=msvc-14.3 -–layout=versioned variant=release link=static threading=multi runtime-link=static