DecodeBufferRect Method

Decodes barcode from a device-independent bitmap (DIB) in buffer by only searching a certain part of the image defined by the parameters top, left, width, height.

Syntax

int DecodeBufferRect(
    unsigned char* pDIBBuffer,
    int iDIBSize,
    int iRectLeft,
    int iRectTop,
    int iRectWidth,
    int iRectHeight
);

Parameters

pDIBBuffer: A buffer data pointer to a DIB.
iDIBSize: An integer that defines the size of buffer data.
iRectLeft: An integer value that defines the left margin coordinate of scanning zone.
iRectTop: An integer value that defines the top margin coordinate of scanning zone.
iRectWidth: An integer that defines the width of scanning zone.
iRectHeight: An integer that defines the height scanning zone.

Return Value

Zero if the function completed successfully; otherwise nonzero.

Remarks

The DecodeBufferRect member method reads an image from DIB buffer by specifying an area, and extract the barcode data.

Example

CBarcodeReader reader;

int iErrorCode = reader.InitLicense("88FFAA09C42D5DE******");

ReaderOptions options;
options.iMaxBarcodeNumPerPage = 1;
options.llBarcodeFormats = (OneD | QR_CODE | PDF417 | DATAMATRIX);

reader.SetReaderOptions(options);
iErrorCode = reader.DecodeBufferRect(pDIBBuffer, iDIBSize, 0, 0, 100, 100);
if(iErrorCode != DBR_OK)
	return;

pBarcodeResultArray pResults = NULL;
reader.GetBarcodes(&pResults);
int iCount = pResults->iBarcodeCount;
for(int i = 0; i < iCount; ++i)
{
	printf("%d: %s\n", i, pResults->ppBarcodes[i]->pBarcodeData);
}

DecodeBufferRect Method

Syntax

Parameters

Return Value

Remarks

Example

See Also