C# 字体操作

using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.IO;
[DllImport("kernel32.dll", SetLastError = true)]
static extern int WriteProfileString(string lpszSection, string lpszKeyName, string lpszString);

[DllImport("user32.dll")]
public static extern int SendMessage(int hWnd, // handle to destination window 
uint Msg, // message 
int wParam, // first message parameter 
int lParam // second message parameter 
);

[DllImport("gdi32")]
public static extern int AddFontResource(string lpFileName);
          
private void installFont()
{

    string WinFontDir = System.Environment.GetEnvironmentVariable("WINDIR")+"\\fonts";
    string FontFileName = "DS-Digital Bold Italic.TTF";
    string FontName = "DS-Digital Bold Italic";
    int Ret;
    int Res;
    string FontPath;
    //const int WM_FONTCHANGE = 0x001D;
    //const int HWND_BROADCAST = 0xffff;
    FontPath = WinFontDir + "\\" + FontFileName;
    if (!File.Exists(FontPath))
    {
        File.Copy(System.Windows.Forms.Application.StartupPath + "\\DS-Digital Bold Italic.TTF", FontPath);
        Ret = AddFontResource(FontPath);

        //Res = SendMessage(HWND_BROADCAST, WM_FONTCHANGE, 0, 0);
        //WIN7下编译这句会出错，不知道是不是系统的问题，这里应该是发送一个系统消息关系不大不影响字体安装，所以我注释掉了
        Ret = WriteProfileString("fonts", FontName + "(TrueType)", FontFileName);
    }
}