MAC: Mono Helloworld example

3
votes

I did a fresh install of Mono on my OSX Yosemite and tried the examples on http://www.mono-project.com/docs/getting-started/mono-basics/.

The Console Hello World example runs without problem but when I tried the WindowsForm Hello World, I got the following error :

System.EntryPointNotFoundException: GdipCreateFromContext_macosx at (wrapper managed-to-native) System.Drawing.GDIPlus:GdipCreateFromContext_macosx (intptr,int,int,intptr&)
  at System.Drawing.Graphics.FromHwnd (IntPtr hwnd) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.XplatUICarbon.PaintEventStart (System.Windows.Forms.Message& msg, IntPtr handle, Boolean client) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.XplatUI.PaintEventStart (System.Windows.Forms.Message& msg, IntPtr handle, Boolean client) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control.WmPaint (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ScrollableControl.  at System.Windows.Forms.ScrollableControl.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ContainerControl.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Form.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control+ControlNativeWindow.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg, IntPtr wParam, IntPtr lParam) [0x00000] in <filename unknown>:0 
Chads-MacBook-Pro:C# ChadLeong$ mono hello.exe
System.EntryPointNotFoundException: GdipCreateFromContext_macosx
  at (wrapper managed-to-native) System.Drawing.GDIPlus:GdipCreateFromContext_macosx (intptr,int,int,intptr&)
  at System.Drawing.Graphics.FromHwnd (IntPtr hwnd) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.XplatUICarbon.PaintEventStart (System.Windows.Forms.Message& msg, IntPtr handle, Boolean client) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.XplatUI.PaintEventStart (System.Windows.Forms.Message& msg, IntPtr handle, Boolean client) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control.WmPaint (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ScrollableControl.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ContainerControl.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Form.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control+ControlNativeWindow.WndProc (System.Windows.Forms.Message& m) [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg, IntPtr wParam, IntPtr lParam) [0x00000] in <filename unknown>:0

Anyone got a clue ? Thank you!!

1
c#macosmono
Sounds like you have no entry point, such as Main in C# console program. - ChiefTwoPencils
Hmmm, but I was merely following the instruction on the tutorial for "WindowsForm Hello World": mono-project.com/docs/getting-started/mono-basics. It should still compile right? - chad
The example in the page you just posted contains this method block: static public void Main () { Console.WriteLine ("Hello Mono World"); } Without that main method, it will not compile. - furkle
@furkle its the next example. "WindowsForm Hello World".. The code should look like this using System; using System.Windows.Forms; public class HelloWorld : Form { static public void Main () { Application.Run (new HelloWorld ()); } public HelloWorld () { Text = "Hello Mono World"; } } - chad
But you must see the Main you just typed. Anyway, if that's the way yours looks then there seems to be something else. Reading this is a start. - ChiefTwoPencils

1 Answers