Data Structure
The dBarcode DLL uses a single data structure for transferring data into the library routines, BARCODE, which is defined in DLSBAR34.H along with a long pointer to the structure LPBAR.
typedef struct
tagBARCODE
{
int
code;
char
name[16];
int
show_text;
int
auto_parity;
int
orientation;
int
show_checkdigit;
int
nominal_size;
int
line_reduction;
int
border_thickness;
COLORREF fore_color;
COLORREF back_color;
int
error;
char
string[84];
int
req_number;
int
parity;
int
alphabetic;
int
length;
int
height;
int
subscript;
int
flags;
int
textgap;
char
string2[84];
int
bearer_size;
int
spare;
int
xunit;
int
bearerthick;
int
margin_size;
int
barratio;
int
charspacing;
int
justification;
}
BARCODE;
typedef BARCODE far *LPBAR;
A BARCODE structure must exist before any barcode-creating library routines are called, so your program requires a declaration such as
BARCODE bc;
to appear in the program before any calls are made to the library routines.
Some members of the Barcode structure must be filled before any calls are made to the library routines. Other members of the structure are used for returning information to the calling application and so do not require filling prior to library calls.
Visual Basic callers use a slightly different structure definition, in which either strings of byte arrays may be defined. When byte arrays are used the length allowed for data is reduced by 4 bytes to allow for the array header, ie.
Private Type BARCODE
code As
Long
name1(12) As Byte
show_text As Long
auto_parity As
Long
orient As Long
show_checkdigit As Long
nominal_size As
Long
line_reduction As Long
border_thickness As Long
fore_color As
Long
back_color As Long
ierror
As Long
string1(80) As Byte
req_number As Long
parity As
Long
alphabetic As Long
length As Long
Height As
Long
subscript As Long
flags As Long
textgap As
Long
string2(80) As Byte
bearer_size As Long
spare As
Long
xunit As Long
bxx As
Long
margin_size As Long
barratio As
Long
charspacing As Long
justification As Long
End Type
More:
Group 1 Library calls