DataCard SR300 Manual do Utilizador descarregar pdf (Página 61)

SR200 & SR300 Printer SDK Guide

Page 57

How to Override Driver Settings

You can override settings in the printer driver using the Win32 ExtEscape()

function.

Tips for success

♦ You must call ExtEscape() function after StartDoc() and before StartPage()

when you change settings.

♦ The modified setting is in effect until the printer handle is removed by

DeleteDC().

Using ExtEscape() to Override a Setting

You can pass settings to the printer driver by using the ExtEscape() function of the

WIN32 API.

ExtEscape() Function

int ExtEscape (

HDC hdc

, // handle to the device context.

Int nEscape

, // Escape ID

int cbParameter

, // size of the parameter data

LPCSTR lpszParameter,

// pointer to the parameter data

int cbResult

, // size of the result area

LPSTR lpszResult

// pointer to the result area

);

Where:

♦ nEscape

Use 9100 for the escape ID.

♦ cbParameter

Set the length of the Parameter in bytes.

♦ lpszParameter

Pointer to the Parameter memory.

♦ cb

Result Set the length of Result memory in bytes.

♦ lpsz

Result Pointer to the Result memory.

Change a Setting

cbParameter

Name Command

Code

ID Size Data (New value)

Length in bytes

1 2 2 n

Value

‘S’(0x53) 1* 2* 1*

1* See cbParameter Values page 61 2* Data length in bytes.

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 75 76

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DataCard SR300 Manual do Utilizador Página 61

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