Struggling with Opaque Pointers in SQLITE swift

Question

Hi I am new to swift and attempting to add a database for my a level coding project. I cannot seem to get opaque pointers to work without errors. I have used tutorials and always get the same errors. The errors that I get:

Expected member name or constructor call after type name on line 3

Cannot convert value of type 'UnsafeMutablePointer<OpaquePointer?.Type>' to expected argument type 'UnsafeMutablePointer<OpaquePointer?>' On line 9

Cannot convert return expression of type 'OpaquePointer?.Type' to return type 'OpaquePointer?' On line 12

    var dbURL = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
    
    func createDatabase() -> OpaquePointer?{
        var db = OpaquePointer?
        let url = NSURL(fileURLWithPath: dbURL)
        
        if let pathComponent = url.appendingPathComponent("Database.sqlite"){
            let filePath = pathComponent.path
            if sqlite3_open(filePath, &db) == SQLITE_OK{
                print("successfully opened database")
                
                return db
            }
          
        }
        
    }

You could help us by explaining which line is #3 and so on but I already see that your function is missing a return at the end, you need add `return nil` — Joakim Danielson, Feb 03 '22 at 18:00
Sorry it's my first post, line 3 is the 3rd line of the code I sent you. — Josh Horne, Feb 03 '22 at 18:02

udi · Accepted Answer · 2022-02-03T18:20:49.370

0

Change var db = OpaquePointer? to var db : OpaquePointer?

Add return nil to the end of the function.

edited Feb 03 '22 at 18:20

answered Feb 03 '22 at 18:02

udi

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score 0 · Answer 2 · answered Feb 03 '22 at 18:07

0

You need to use a colon instead of a equal sign on line 3.

answered Feb 03 '22 at 18:07

Hamish Wormald

1

Struggling with Opaque Pointers in SQLITE swift

2 Answers2