2012-08-06 78 views
0

我使用自定义字体和定时器标签中的值发生变化的标签。我的应用程序开始最小化。当我显示应用程序时,有时会显示异常并且标签中的文字是红色的。使用自定义字体在标签中绘制文本时参数无效

这里我尝试调用异步方法用于标签文本变化

private void timer1_Tick(object sender, EventArgs e) 
    { 
     // create a delegate of MethodInvoker poiting to showTime function. 
     MethodInvoker simpleDelegate = new MethodInvoker(showTime); 
     // Calling showTime Async 
     simpleDelegate.BeginInvoke(null, null); 
    } 

字体加载

public Form1() 
    { 
     InitializeComponent(); 

     SystemEvents.SessionSwitch += new SessionSwitchEventHandler(SystemEvents_SessionSwitch); //event handler for windows lock 

     File.WriteAllBytes(appPath + "\\font.ttf", Resources.font); //copy font from resources 

     try 
     { 
      PrivateFontCollection pfc = new PrivateFontCollection(); 
      pfc.AddFontFile(appPath + @"/font.ttf"); 
      label1.Font = new Font(pfc.Families[0], 11, FontStyle.Bold); 
     } 
     catch 
     { 
      MessageBox.Show("Failed to load nice font." + "\r\n" + "Using standart font instead.", "Time app", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); 
     } 

    } 

这里是标签TET变化的方法

private void showTime() 
    { 
     label1.Text = time.ToString(); 
    } 

** * ** 异常文本 ** * ****

System.ArgumentException: Parameter is not valid. 
at System.Drawing.FontFamily.GetName(Int32 language) 
at System.Drawing.FontFamily.get_Name() 
at System.Windows.Forms.Internal.WindowsFont.FromFont(Font font, WindowsFontQuality fontQuality) 
at System.Windows.Forms.Internal.WindowsGraphicsCacheManager.GetWindowsFont(Font font, WindowsFontQuality fontQuality) 
at System.Windows.Forms.TextRenderer.MeasureText(String text, Font font, Size proposedSize, TextFormatFlags flags) 
at System.Windows.Forms.Layout.LayoutUtils.MeasureTextCache.GetUnconstrainedSize(String text, Font font, TextFormatFlags flags) 
at System.Windows.Forms.Layout.LayoutUtils.MeasureTextCache.TextRequiresWordBreak(String text, Font font, Size size, TextFormatFlags flags) 
at System.Windows.Forms.Label.CreateTextFormatFlags(Size constrainingSize) 
at System.Windows.Forms.Label.CreateTextFormatFlags() 
at System.Windows.Forms.Label.OnPaint(PaintEventArgs e) 
at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer) 
at System.Windows.Forms.Control.WmPaint(Message& m) 
at System.Windows.Forms.Control.WndProc(Message& m) 
at System.Windows.Forms.Label.WndProc(Message& m) 
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) 
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) 
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) 

问题:如何在使用自定义的字体林摆脱这种异常?

回答

0

下面是在这里的另一个问题中使用的示例。它显示你需要什么。 http://www.bobpowell.net/embedfonts.htm

+0

404:

移动实例的方法外,以防止从GC收集它。也许类似的信息可以在http://dotnet-coding-helpercs.blogspot.com/2009/06/how-to-embed-true-type-font-in-using-c.html? – erdomke 2013-05-23 19:02:46

0

的问题是,在pfc变量PrivateFontCollection实例超出范围,并且有时被吸入首次(这似乎获得的强引用实例之后)控制之前被收集。链接

class Form1 : Form 
{ 
    readonly PrivateFontCollection _pfc = new PrivateFontCollection(); 
    public Form1() 
    { 
     ... 

     _pfc.AddFontFile(appPath + @"/font.ttf"); 

     ... 
    } 
} 
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