使用Swift从NSTextfield到（常量无符号字符*）

如何在C程序中正确地从Swift中的NSTextField接收（const unsigned char*）

案例1：

let string1 = atextfield!.stringValue // -> "Test"
print(string1) // -> "Test"

调试中的string1/\u core/\u baseAddress=nil//

let string2 = string1.utf8CString.withUnsafeBytes
{
    ptr -> UnsafePointer<UInt8> in
    return ptr.load(as: UnsafePointer<UInt8>.self)
}

let string2 :UnsafePointer<UInt8> = string1.utf8CString.withUnsafeBufferPointer {
($0.baseAddress!.withMemoryRebound(to: UnsafePointer<UInt8>.self, capacity: string1.lengthOfBytes(using: .utf8)) {$0})}.pointee

testCPgm(string2)

string1/_core/_baseAddress=（_rawValue=0x…“Test”）//正在调试中

let string2 = string1.utf8CString.withUnsafeBytes
{
    ptr -> UnsafePointer<UInt8> in
    return ptr.load(as: UnsafePointer<UInt8>.self)
}

let string2 :UnsafePointer<UInt8> = string1.utf8CString.withUnsafeBufferPointer {
($0.baseAddress!.withMemoryRebound(to: UnsafePointer<UInt8>.self, capacity: string1.lengthOfBytes(using: .utf8)) {$0})}.pointee

testCPgm(string2)

致命错误：UnsafeRawBufferPointer.load超出范围

案例3：

let string1 = "Test"
print(string1) // -> "Test"

let string1 = atextfield!.stringValue // Value = "Test"
print(string1) // -> "Test"

let string1 = "Test"
print(string1) // -> "Test"

调试中的string1/\u core/\u baseAddress=nil//

let string2 = string1.utf8CString.withUnsafeBytes
{
    ptr -> UnsafePointer<UInt8> in
    return ptr.load(as: UnsafePointer<UInt8>.self)
}

let string2 :UnsafePointer<UInt8> = string1.utf8CString.withUnsafeBufferPointer {
($0.baseAddress!.withMemoryRebound(to: UnsafePointer<UInt8>.self, capacity: string1.lengthOfBytes(using: .utf8)) {$0})}.pointee

testCPgm(string2)

案例4：

let string1 = "Test"
print(string1) // -> "Test"

let string1 = atextfield!.stringValue // Value = "Test"
print(string1) // -> "Test"

let string1 = "Test"
print(string1) // -> "Test"

string1/_core/_baseAddress=（_rawValue=0x…“Test”）//正在调试中

let string2 = string1.utf8CString.withUnsafeBytes
{
    ptr -> UnsafePointer<UInt8> in
    return ptr.load(as: UnsafePointer<UInt8>.self)
}

let string2 :UnsafePointer<UInt8> = string1.utf8CString.withUnsafeBufferPointer {
($0.baseAddress!.withMemoryRebound(to: UnsafePointer<UInt8>.self, capacity: string1.lengthOfBytes(using: .utf8)) {$0})}.pointee

testCPgm(string2)

testCPgm中的testcfield=“”

void testCPgm(const unsigned char *testcfield)
{

}

案例5-->有效

let string1 = "Test"

or

let string1 = atextfield!.stringValue
print(string1) // -> "Test"

testCPgm(string1) // Yes directly from String to (const unsigned char *)

testCPgm中的testcfield=“Test”

void testCPgm(const unsigned char *testcfield)
{

}

---

谢谢你的回答

这是我没有结束就找到的

从字符串（string1）到（常量无符号字符*）（string2）

我不知道是否有更优雅的方法

我没有找到数据的等价项（没有闭包）（不是NSData（use.bytes））