P /通过错位名称调用函数

Question

我试图在windows ce 6.0环境中调用.net cf 3.5中的非托管c ++ dll中的函数.

结构定义为:

typedef struct TagOperatorInfo
{
    DWORD dwMode;       
    DWORD dwFormat;     //Operator name format
    DWORD dwAct;        //Network type(Available in 3G module£ºGSM or 3G),
    TCHAR szOper[32];   
}OperatorInfo,*LPOperatorInfo;

和函数调用是:

BOOL GetCurOperatorInfo(LPOperatorInfo pinfo);

我在.net中定义了TagOperatorInfo,如下所示:

[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential, CharSet = System.Runtime.InteropServices.CharSet.Auto)]
    public struct TagOperatorInfo
    {

        /// DWORD->unsigned int
        public uint dwMode;

        /// DWORD->unsigned int
        public uint dwFormat;

        /// DWORD->unsigned int
        public uint dwAct;

        /// TCHAR[32]
        [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst = 32)]
        public string szOper;
    }

在看到一些文章和msdn文档后,我将本机函数称为:

[System.Runtime.InteropServices.DllImportAttribute(gsmaAdapterDLLName, EntryPoint = "#30", CallingConvention = CallingConvention.Winapi)]
    [return: System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]
    internal static extern bool GetCurOperatorInfo([MarshalAs(UnmanagedType.LPStruct)] ref NativeHelper.TagOperatorInfo operatorInfo);

注意:我使用序号定义的入口点调用该函数,因为c ++错位的名称.

我遇到的问题是我总是得到notSupportedException抛出.我不明白因为ref参数应该给它指向struct的指针.

我调用它的.net函数是:

/// <summary>
    /// Gets the current operator information.
    /// </summary>
    /// <param name="operatorInfo">The operator info.</param>
    /// <returns></returns>
    public static bool GetOperatorInformation(out NativeHelper.TagOperatorInfo operatorInfo)
    {
        operatorInfo = new NativeHelper.TagOperatorInfo();

        if (NativeImports.GetCurOperatorInfo(ref operatorInfo) == true)
        {
            return true;
        }
        else
        {
            return false;
        }

    }

我错过了这个工作.

UPDATE

新的.Net Compact Framework方法调用

[System.Runtime.InteropServices.DllImportAttribute(gsmaAdapterDLLName, EntryPoint = "?GetCurOperatorInfo@CGSMAdapter@@YAHPAUTagOperatorInfo@@@Z", CallingConvention = CallingConvention.Winapi)]
    [return: System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]
    internal static extern bool GetCurOperatorInfo([MarshalAs(UnmanagedType.LPStruct)]ref NativeHelper.TagOperatorInfo operatorInfo);

Answer 1

您只能调用已导出为C样式函数的函数.据我所知,你无法通过P/Invoke直接调用C++函数,例如:

如何设置C++函数以便p/invoke可以使用它？

更新

实际上,看起来你可以在通过P/Invoke调用函数时使用受损的名称.这是我过去永远无法工作的东西,所以我站得更正了.使用名称而不是序数也应该更有弹性:

参考:未找到入口点例外

所以类似于:

[DllImport(gsmaAdapterDLLName,
    EntryPoint="?GetCurOperatorInfo@CGSMAdapter@@YAHPAUTagOperatorInfo@@@Z", 
    ExactSpelling = true,
    CallingConvention = CallingConvention.Cdecl)]
public static extern bool GetCurOperatorInfo(out TagOperatorInfo info);

对于.Net CF:

DllImport(gsmaAdapterDLLName,
    EntryPoint="?GetCurOperatorInfo@CGSMAdapter@@YAHPAUTagOperatorInfo@@@Z", 
    CallingConvention = CallingConvention.WinApi)]
public static extern bool GetCurOperatorInfo(out TagOperatorInfo info);