User's Manual Part 1

Printer SupportChapter —5
134 700 Series Color Mobile Computer User’s Manual
O’Neil Printer Driver
The DTR printer communications driver is a Stream Device Driver
named ONEIL.DLL.
All applications use WIN32 API functions to access drivers. Basic
operations are easily implemented by applications through the CreateFile(),
WriteFile(), DeviceIOControl() and CloseHandle() Win32 APIs.
The driver supports communications to 6804DM, 6804T, 6805A, 6806,
6808, 681T, and 781 printers over a selected serial port.
DTR Driver Installation and Removal
Your application must install the device driver by using the RegisterDe-
vice() function. The driver name is ONEIL.DLL. We recommend that
you use “DTR” for the Device Name parameter, “1” for the Device Driver
index parameter, and use any of the following strings for the last parame-
ter:
S NULL (==0) Defaults to COM1 @ 9600
S “COM1” only COM port specified defaults to 9600
S “COM1:9600” sets to COM port and specified bit rate
S “COM1:19200” sets to COM port and specified bit rate
Use the HANDLE returned by RegisterDevice() a s the parameter to
DeregisterDevice(). The correct usage of the RegisterDevice() function call
is demonstrated below. You may use DeregisterDevice() to uninstall the
driver.
Install()
{
HANDLE hDevice;
TCHAR port[6];
port[0] = TCHAR(‘C’);
port[1] = TCHAR(‘O’);
port[2] = TCHAR(‘M’);
port[3] = TCHAR(‘1’);
port[4] = TCHAR(‘:’);
port[5] = TCHAR(0);
hDevice = RegisterDevice ( (TEXT(”DTR”), 1, TEXT(”\\WINDOWS\\ONEIL.DLL”),
(DWORD)port);
}