E-Seek M500, Руководство пользователя

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M500 USER MANUAL AND PROGRAMMER SDK
Page 25
The C# API M500_BC structure contains a 2D data structure.
unsafe
public struct M500_BC
{
public BC_1D d1; // 1D (linear)
public BC_2D d2; // 2D (PDF417)
public int iMajor;
public int iMinor;
public int iOrient; // Orientation
public int iTry;
public fixed byte cModel[8];
}
If the PDF417 barcode is found the iOrient element will
The
iOrient element has four enumerated values of the card orinetation and zero for unknown.
0 = Unknown orientation
1 = Normal orientation (Front of card is on the right).
2 = Front on the right but upside down.
3 = Front is on the left.
4 = Front is on the left and upside down.
The main element of the 2D barcode structure is the length (zero if not decoded).
unsafe public struct BC_2D
{
public short nLen; // Length
…
}
After getting the barcode call back check the length to determine if the data is valid. For example, to
check if the PDF417 data was decoded check the length in “
nLen
”
.
m_BC.d2.nLen // Length of valid data in aryP417
The C# API
M500_
DATA structure has byte arrays to access the PDF417 and mag stripe data.
Check “ nLen
” to determine the number of valid bytes.
public struct M500_DATA
{
public byte [] aryP417 ; // Byte array to PDF417
public byte [] aryT1 ; // Byte array to magnetic track 1
public byte [] aryT2 ; // Byte array to magnetic track 2
public byte [] aryT3 ; // Byte array to magnetic track 3
}