将CUnsignedChar指针转换为CChar指针

Question

我有一个客观的C函数，它给了我一个

UnsafePointer<UInt8>/UnsafePointer<CUnsignedChar>. 

但是我需要这些数据作为

UnsafePointer<Int8>

遗憾的是，我要求的功能

UnsafePointer<UInt8>.

Answer 1

在你的情况下，＆＃34;不安全的位投射＆＃34;将是最简单的解决方案：

let ptr: UnsafePointer<UInt8> = ...
let i8ptr = unsafeBitCast(ptr, to: UnsafePointer<Int8>.self)

另一种选择是＆＃34;记忆重新绑定＆＃34;：

ptr.withMemoryRebound(to: Int8.self, capacity: <count>) { i8ptr in
    // ...
}