69
9.6.12
Using the API in Visual Basic 6.0
1.
Ensure that the DLL file is placed in the same folder as your application executable.
2.
Import the functions you need from the DLL into your source code with the Declare
statement:
Private
Declare
Function
CAN_Open
Lib
"CANDLL_STDCALL.dll"
(
ByVal
ComPort
As
String
,
ByVal
szBitrate
As
String
,
ByVal
acceptance_code
As
String
,
ByVal
acceptance_mask
As
String
,
ByRef
Flags
As
Long
,
ByVal
Mode
As
Long
)
As
Long
3.
Create a definition of the CAN_MSG structure for the CAN_Write and CAN_Read
functions, if needed.
Private
Type
CAN_MSG
Id
As
Long
Size
As
Byte
Data
(
0
To
7
)
As
Byte
Flags
As
Byte
Timestamp
As
Integer
End
Type
To use the CAN_MSG structure, you will need to create an instance of the structure
you just defined.
Private
myCANMSG
As
CAN_MSG
4.
In order to communicate with the channel with other functions after opening it
with CAN_Open, you need to create a variable to store the handle value.
Private
myHandle
As
Long
myHandle
=
CAN_Open
((
"COM3"
,
"50"
,
"00000000"
,
"00000000"
,
1
,
2
)
5.
This concludes the basic setup process of using the DLL in Visual Basic 6.0.
Imported functions can then be easily called form the DLL with the parameters
created above.
