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_Diag_PreSend

Valid for: CANoe DE

Function Syntax

_Diag_Presend(BYTE data[], WORD& dataLenInOut, WORD headerLen)

Description

Is called before a frame is transmitted. Allows manipulating the frame.

Parameters

data: Transmitted data buffer of the frame.
dataLenInOut: Indicates the length of the frame when _Diag_PreSend is called. Determines the length of the frame before the frame is transmitted.
headerLen: Length of the header of a frame. Not supported yet.

Return Values

—

Example

_Diag_Presend(BYTE data[], WORD& dataLenInOut, WORD headerLen)
{
    if (!gDoPatchInPreSend) // Global variable
    {
        return;
    }

    gDoPatchInPreSend = 0; // deactivate patching

    // Changing the data and the length of the request
    data[2] = 0x99;
    data[3] = 0x99;
    dataLenInOut = 4;
}