将字符串数组从 ANSI C 编组到 C# 中的字符串 []

Question

我正在寻找将字符串数组从 ANSI C 编组到 C# 中的字符串 [] 的解决方案。

在 ANSI C 中看起来像：

const char *cities[] = {"Moscow", "New York", "London"};

在 C# 中，我有一个 System.IntPtr IntPtrCities，我想将其转换为字符串列表：

string[] citiesList

我还需要将此解决方案反转...从 C# 中的 string[] citiesList 到 System.IntPtr IntPtrCities 到 ANSI C char ** cities.

我试过 Marshal.PtrToStringAnsi 但它只适用于一个字符串，而且我不知道 ANSI C 层的字符串列表大小。

Answer 1

You cannot marshal an array directly from native to managed code without knowing the size of the array.

谢谢。这就是重要信息！

在找到这个：https://limbioliong.wordpress.com/2011/08/14/returning-an-array-of-strings-from-c-to-c-part-1/

// This method transforms an array of unmanaged character pointers (pointed to by pUnmanagedStringArray)
// into an array of managed strings.
//
// This method also destroys each unmanaged character pointers and will also destroy the array itself.
static void MarshalUnmananagedStrArray2ManagedStrArray(IntPtr pUnmanagedStringArray, int StringCount, out string[] ManagedStringArray)
{
    IntPtr[] pIntPtrArray = new IntPtr[StringCount];
    ManagedStringArray = new string[StringCount];

    Marshal.Copy(pUnmanagedStringArray, pIntPtrArray, 0, StringCount);

    for (int i = 0; i < StringCount; i++)
    {
        ManagedStringArray[i] = Marshal.PtrToStringAnsi(pIntPtrArray[i]);
        Marshal.FreeCoTaskMem(pIntPtrArray[i]);
    }

    Marshal.FreeCoTaskMem(pUnmanagedStringArray);
}

将字符串数组从 ANSI C 编组到 C# 中的字符串 []

Marshalling string array from ANSI C to string[] in C#

c

c#

marshalling