[英]How to call a function in struct from C++ dll by C#
我的C#項目必須引用一個C ++ dll,
struct中的SetConfig()是我的目標,頭部看起來像
extern "C"
{
int HSAPI GetSDKVersion();
IHsFutuComm* HSAPI NewFuCommObj(void* lpReserved = NULL);
struct IHsFutuComm:public IHSKnown
{
virtual int HSAPI SetConfig(const char* szSection,const char* szName,const char* szVal) = 0;
...
}
}
和C#看起來像
class Program
{
[DllImport("kernel32.dll")]
private static extern IntPtr LoadLibrary(string dllToLoad);
[DllImport("kernel32.dll")]
public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
public delegate Int32 GetSDKVersion();
public delegate IntPtr NewFuCommObj(IntPtr lpReserved);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
public struct IHsFutuComm
{
[MarshalAs(UnmanagedType.FunctionPtr)]
public SetConfig pSetConfig;
}
[UnmanagedFunctionPointer(CallingConvention.StdCall)]
public delegate Int32 SetConfig(string szSection, string szName, string szVal);
static void Main(string[] args)
{
var pDll = LoadLibrary("HsFutuSDK.dll");
var pGetSDKVersion = GetProcAddress(pDll, "GetSDKVersion");
var dGetSDKVersion = (GetSDKVersion)Marshal.GetDelegateForFunctionPointer(pGetSDKVersion, typeof(GetSDKVersion));
var sdkVersion = dGetSDKVersion();
if (sdkVersion == 0x10000019)
{
var pNewFuCommObj = GetProcAddress(pDll, "NewFuCommObj");
var dNewFuCommObj = Marshal.GetDelegateForFunctionPointer(pNewFuCommObj, typeof(NewFuCommObj)) as NewFuCommObj;
var pIHsFutuComm = dNewFuCommObj(IntPtr.Zero);
var IHsFutuComm1 = (IHsFutuComm)Marshal.PtrToStructure(pIHsFutuComm, typeof(IHsFutuComm));
//error here
var re = IHsFutuComm1.pSetConfig("futu", "server", "127.0.0.1:2800");
}
}
}
最后一行的錯誤是“試圖讀取或寫入受保護的內存。這通常表明其他內存已損壞。”
如何通過C#調用SetConfig()?
在此SetConfig中,是結構的(純)虛擬成員函數,因此調用約定應為thiscall ,並且函數指針不像C#代碼中那樣保留在結構中,而是位於vtable中。
C ++代碼中的結構聲明可能更像C#中的接口,而不是C#中的結構。
抱歉,我無法提供完整的答案,但我希望這會為您指明正確的方向。
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