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);    }}