A program started its history as written in C for MS-DOS. It calculate something, then as a main output, writes the information on line printer on LTP1: port. Sometimes 10 lines in a minute, sometimes 1 line in hours... (1) DOS version of program just wrote the ASCII characters to LPT1: port and     it worked normally. (2) we had to upgrade it to Win 3.1 platform, which discouraged the direct access     to the printer, but the SDK gave PASSTHROUGH option to bypass the print manager     like:         HDC          hdcPr;         struct lineout_s {                 int n;                 char line[LINLEN+1];         } lineout;         lll.n = 1; // one line         strcpy(lll.line, a string );         hdcPr =CreateDC (lpPrDrv, lpPrDev, LPT1: , (LPSTR) NULL);         Escape (hdcPr, PASSTHROUGH, NULL, (LPCSTR)&lineout, NULL); (3) Win32 SDK stopped supporting PASSTHROUGH option, then there was a way to     write directly to the port like:         HANDLE      file;         BOOL        bWrite;         DWORD       written;         OVERLAPPED  o;         char    string[LINELEN+1];         file = CreateFile( LPT1: , GENERIC_WRITE, 0, NULL, OPEN_EXISTING,                                           FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,NULL);         ...         bWrite = WriteFile(file, string, strlen(sting), &written, &o);    and it worked with Windows 95 and windows 98. Now, with Windows NT and with Windows 2000 doesn't do anything with this WriteFile() function. Now the client is upgrading to Windows 2000, we need to find the method to print one line on the line printer, without going through print manager (which would try to print a page at once.) Did anyone have the same or similar problem? Did you already find the solution? Any suggestion appreciated. Thanks in advance. muchan   < This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Well... it worked. Simple test was     FILE  *fp;     fp = fopen( LPT1: , w );     if (fp != NULL)         fprintf(fp, testn );     }     fclose(fp); It printed the line!   unbelievable.... Elementary, my dear Watson ;^) Luc