Writefile method error serial port -


i'm trying write serial port com 1: (to atmega8 mcu) using escapecommfunction create file method, write file

    dcb dcb = new dcb();      [dllimport("kernel32.dll")]     static extern bool setcommstate(intptr hfile, [in] ref dcb lpdcb);      [dllimport("kernel32.dll", setlasterror = true)]     public static extern bool closehandle(intptr handle);       [dllimport("kernel32.dll", setlasterror = true)]     private static extern bool escapecommfunction(intptr hfile, int dwfunc);      intptr porthandle;     int setrts = 3;     [dllimport("kernel32.dll", setlasterror = true, charset = charset.unicode)]     private static extern intptr createfile(string lpfilename, system.uint32 dwdesiredaccess, system.uint32 dwsharemode, intptr psecurityattributes, system.uint32 dwcreationdisposition, system.uint32 dwflagsandattributes, intptr htemplatefile);      [dllimport("kernel32.dll")]     static extern bool writefile(intptr hfile, byte[] lpbuffer, uint nnumberofbytestowrite, out uint lpnumberofbyteswritten, [in] ref nativeoverlapped lpoverlapped);      [structlayout(layoutkind.sequential, pack = 8)]     public struct nativeoverlapped     {         private intptr internallow;         private intptr internalhigh;         public long offset;         public intptr eventhandle;     }      nativeoverlapped overlap = new nativeoverlapped();

mainform load:

    private void mainform_load(object sender, eventargs e)     {         try         {             porthandle = createfile("com1", 0x80000000 | 0x40000000, 0x00000000, intptr.zero, 4, 0x40000000, intptr.zero);             dcb.baudrate = 9600;             dcb.parity = 0;             dcb.bytesize = 8;             dcb.stopbits = 1;             setcommstate(porthandle, ref dcb);             messagebox.show(escapecommfunction(porthandle, 3).tostring());         }         catch (exception ex)         {             messagebox.show(ex.message);         }     }

and i'm trying send data

    private void btnsend_click(object sender, eventargs e)     {         lpnumberofbyteswritten = 0;         byteslen = 0;         byte[] message = new byte[11];         //creating message         byteslen = (uint)message.length;         messagebox.show(writefile(porthandle, message, byteslen, out lpnumberofbyteswritten, ref overlap).tostring());     }

escapecommfunction come true, writefile come false. wrong?


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