c++ - Win32 Compiler errors -

i managed code net pc machine communication via rs-232. i'm using win32 console application in vs2010. wanted run , see outcome. have errors unable rectify.

heres's code:

    // hthh.cpp : defines entry point console application.     //      #include "stdafx.h"     #include "windows.h"      handle hserial;      int _tmain(int argc, _tchar* argv[])     {         hserial = createfile("com4",                   generic_read | generic_write,                  0,                  0,                  open_existing,                 file_attribute_normal,                 0);         if (hserial == invalid_handle_value)         {     if(getlasterror()==error_file_not_found)     {         }          }          dcb dcbserialparams = {0};          dcbserial.dcblength=sizeof(dcbserialparams);          if (!getcommstate(hserial, &dcbserialparams))         {         }             dcbserialparams.baudrate=cbr_9600;             dcbserialparams.bytesize=8;             dcbserialparams.stopbits=onestopbit;             dcbserialparams.parity=noparity;          if(!setcommstate(hserial, &dcbserialparam)) { }     commtimeouts timeouts={0};      timeouts.readintervaltimeout=50;     timeouts.readtotaltimeoutconstant=50;     timeouts.readtotaltimeoutmultiplier=10;     timeouts.writetotaltimeoutconstant=50;     timeouts.writetotaltimeoutmultiplier=10;      if(!setcommtimeouts(hserial, &timeouts))     {     }          char szbuff[n+1] = {0};         dword dwbytesread = 0;          if(!readfile(hserial, szbuff, n, &dwbytesread, null))         {       closehandle(hserial);      return 0;    } 

the errors follows:--

1>c:\users\singanathan\documents\visual studio 2010\projects\hthh\hthh\hthh.cpp(17): error c2664: 'createfilew' : cannot convert parameter 1 'const char [5]' 'lpcwstr'

1> types pointed unrelated; conversion requires reinterpret_cast, c-style cast or function-style cast

1>c:\users\singanathan\documents\visual studio 2010\projects\hthh\hthh\hthh.cpp(28): error c2065: 'dcbserial' : undeclared identifier

1>c:\users\singanathan\documents\visual studio 2010\projects\hthh\hthh\hthh.cpp(28): error c2228: left of '.dcblength' must have class/struct/union

1> type ''unknown-type''

1>c:\users\singanathan\documents\visual studio 2010\projects\hthh\hthh\hthh.cpp(38): error c2065: 'dcbserialparam' : undeclared identifier

1>c:\users\singanathan\documents\visual studio 2010\projects\hthh\hthh\hthh.cpp(53): error c2065: 'n' : undeclared identifier

1>c:\users\singanathan\documents\visual studio 2010\projects\hthh\hthh\hthh.cpp(56): error c2065: 'n' : undeclared identifier

1>c:\users\singanathan\documents\visual studio 2010\projects\hthh\hthh\hthh.cpp(64): fatal error c1075: end of file found before left brace '{' @ 'c:\users\singanathan\documents\visual studio 2010\projects\hthh\hthh\hthh.cpp(10)' matched ========== build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

sorry, lenghty. appreciate advise.

thanks

you compiling targeting unicode , createfile maps createfilew expects wide character arrays, wchar_t*. "com4" char literal. change l"com4".

the compiler told dcbserial undeclared. it's right. , same dcbserialparam. variable declared named dcbserialparams.

and did not declare n @ all.