我正试图在windows ce 6.0环境中的.net cf 3.5中调用非托管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;
,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,我将原生函数称为:
[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 ++受到严重破坏的名称。
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。
调用它的我的.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;
}
}
我缺少这项工作。
更新
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);
答案 0 :(得分:7)
您只能调用已导出为C样式函数的函数。据我所知,你不能通过P / Invoke直接调用C ++函数,例如:
How to set up a C++ function so that it can be used by p/invoke?
<强>更新强>
实际上,在通过P / Invoke调用函数时,看起来确实可以使用错位名称。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具弹性:
参考:Entry Point Not Found Exception
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);