C#中與C++中的 LPWSTR(wchar_t *) 對應的類型

1.設置 CharSet = CharSet.Unicode

 [DllImport("test.dll", EntryPoint = "sum()", CharSet = CharSet.Unicode)]

public static extern int sum(wchar_t* param);

1>test.dll是載入的dll

2>sum()是dll中的函數

3>param是函數中的參數。

2.把wchar_t* 轉為stringbuilder/string

 [DllImport("test.dll", EntryPoint = "sum()", CharSet = CharSet.Unicode)]

public static extern int sum(StringBuilder param);

調用時候：

sum("hello world !")

總結：設置charset 就可以用stringbuilder代替wchar_t*

 看到的另一種方法：

[DllImport("Netapi32.dll", EntryPoint = "NetUserChangePassword", CharSet = CharSet.Unicode)]
public static extern int NetUserChangePassword(
[MarshalAs(UnmanagedType.LPWStr)] string domainname,
[MarshalAs(UnmanagedType.LPWStr)] string username,
[MarshalAs(UnmanagedType.LPWStr)] string oldpassword,
[MarshalAs(UnmanagedType.LPWStr)] string newpassword);