如何使用DLLImport从C＃传递字符串到C ++（和从C ++到C＃）？

问题描述：

我一直试图发送字符串/从C＃到/从C ++很长一段时间，但没有设法让它工作...

I've been trying to send a string to/from C# to/from C++ for a long time but didn't manage to get it working yet ...

所以我的问题很简单：

有人知道从C＃到C ++和从C ++到C＃的一个字符串吗？

（一些示例代码会很有帮助） / p>

So my question is simple :
Does anyone know some way to send a string from C# to C++ and from C++ to C# ?
(Some sample code would be helpful)

答

将字符串从C＃传递到C ++应该是简单的。 PInvoke将为您管理转换。

Passing string from C# to C++ should be straight forward. PInvoke will manage the conversion for you.

从C ++到C＃的获取字符串可以使用StringBuilder完成。

Geting string from C++ to C# can be done using a StringBuilder. You need to get the length of the string in order to create a buffer of the correct size.

下面是一个众所周知的Win32 API的两个例子：

Here are two examples of a well known Win32 API:

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
 static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);
public static string GetText(IntPtr hWnd)
 {
     // Allocate correct string length first
     int length       = GetWindowTextLength(hWnd);
     StringBuilder sb = new StringBuilder(length + 1);
     GetWindowText(hWnd, sb, sb.Capacity);
     return sb.ToString();
 }


[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
 public static extern bool SetWindowText(IntPtr hwnd, String lpString);
SetWindowText(Process.GetCurrentProcess().MainWindowHandle, "Amazing!");

如何使用DLLImport从C＃传递字符串到C ++（和从C ++到C＃）？

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