c# - 非托管 DLL 的相对路径

Question

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Answer 1

如果您尝试调用位于非标准位置的非托管库，您需要将此位置添加到 Windows 用于查找 dll 文件的 dll 搜索路径。

如果您的用户可以告诉程序c/c++库文件在哪里，您可以在他们选择时手动加载它。

public class UnsafeNativeMethods {
    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern bool SetDllDirectory(string lpPathName);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern int GetDllDirectory(int bufsize, StringBuilder buf);

    [DllImport("kernel32", CharSet = CharSet.Unicode, SetLastError = true)]
    public static extern IntPtr LoadLibrary(string librayName);

    [DllImport("mylibrary")]
    public static extern void InitMyLibrary();
}

您可以像这样以某种形式的预加载例程调用上面的内容:

public void LoadDllFile( string dllfolder, string libname ) {
    var currentpath = new StringBuilder(255);
    UnsafeNativeMethods.GetDllDirectory( currentpath.Length, currentpath );

    // use new path
    UnsafeNativeMethods.SetDllDirectory( dllfolder );

    UnsafeNativeMethods.LoadLibrary( libname );

    // restore old path
    UnsafeNativeMethods.SetDllDirectory( currentpath );
}

你可以这样调用它:

LoadDllFile( "c:\whatever", "mylibrary.dll" );