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IMAGETEAM™ 4X00 Series Software Development Kit (SDK) User’s Guide 2 - 69
Parameters
dwTimeout
Time in milliseconds that the engine scans until finding a decode. The timeout value must be greater than zero.
pchMessage
Upon successful return, this variable points to the decoded message. The caller should allocate enough memory for
this buffer to hold the largest possible decode message. See oemGetMaxMessageChars (page 2-12).
pchCodeID
Upon successful return, this variable points to the Hand Held Products Code ID for the decoded symbology. See
Symbology Identifiers (page 3-1).
pchAIMID
Upon successful return, this variable points to the AIM ID for the decoded symbology. See Symbology Identifiers (page
3-1).
pchSymModifier
Upon successful return, this variable points to the code modifier for the decoded symbology. See Symbology Identifiers
(page 3-1).
pnLength
Upon successful return, this variable points to the length of the bar code data that was captured. The length is
represented in terms of the number of BYTE characters in the BYTE *pchMessage.
fpCallBack
Pass in this pointer to a parameterless BOOL-returning function to allow for an external event that causes a return from
oemWaitForDecodeRaw. As long as the function pointed to by fpCallBack returns TRUE, oemWaitForDecodeRaw
continues to attempt to decode a symbol. If the function pointed to by fpCallBack returns FALSE, then
oemWaitForDecodeRaw returns with a Result_t of RESULT_ERR_NOTRIGGER. OemWaitForDecodeRaw also
returns if it gets a valid decode or the dwTimeout occurs. Setting the parameter to NULL prevents the API from calling
this callback function. In that case, oemWaitForDecodeRaw only returns after a valid decode of dwTimeout has passed
without a successful decode.
oemWaitMultipleDecode
This function is used to read multiple symbols using a single function call. When called, this function attempts to find and decode
unique symbols once and use the multi-read callback function to pass the decoded data back to the calling application. This
function continues to find and decode symbols until the time specified in the dwTimeout parameter has expired, or until one of
the callback functions returns false.
Result_t oemWaitMultipleDecode (
DWORD dwTimeout,
BOOL (*pMultiReadCallBack)(DecodeMsg_t *),
BOOL (*pKeepGoingCallBack)(void)
)
Return Values
RESULT_SUCCESS
RESULT_ERR_UNSUPPORTED
RESULT_ERR_PARAMETER
RESULT_ERR_NOTRIGGER