如何在Swift中从ConstUnsafePointer创建CStirng

Question

我知道CString可以使用UnsafePointer初始化，但是如何使用ConstUnsafePointer创建它

代码错误：ConstUnsafePointer无法转换为UnsafePointer

     var result:ConstUnsafePointer = sqlite3_column_text(stmt, num)
     let cstr:CString = CString(result)

或如何将其转换为UnsafePointer

Answer 1

您只需要查看UnsafePointer：

var result: ConstUnsafePointer<UInt8> = sqlite3_column_text(stmt, num)
let cstr: CString = CString(UnsafePointer<UInt8>(result))

Answer 2

请用变量替换LENGTH。

var result: ConstUnsafePointer = sqlite3_column_text(stmt, num)
var resultToString: NSString = NSString(bytes: result, length: LENGTH, encoding: NSUTF8StringEncoding)
var cstring: CString = resultToString.UTF8String