//********************************************************
#define EFMI_POINTNAMELENGTH 48
//结构
typedef struct defefSTReadRtInfoRequest{
long time;
char pointName[EFMI_POINTNAMELENGTH+1];
char ednaServ[EFMI_POINTCOMMLENGTH+1];
}efSTReadRtInfoRequest;//****************************************************************//****************************************************************
typedef struct defefSTReadRtResponse{
double value;
long time;
unsigned short status;/////////////////////////////////////////
char pointName[EFMI_POINTNAMELENGTH+1];//点名,扩展ID
}efSTReadRtInfoResponse;函数:
BOOL effnEDClientCheckPointInfoByTimeEx(
efSTReadRtInfoRequest*pReqBuffer,
efSTReadRtInfoResponse * pResBuffer,
unsigned long Count
);获取实时数据。
//c#调用
[StructLayout(LayoutKind.Sequential)]
public struct defefSTReadRtInfoRequest
{
public long time;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 49)]
public char[] pointName;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 48)]
public char[] ednaServ;
}//****************************************************************//****************************************************************
[StructLayout(LayoutKind.Sequential)]
public struct defefSTReadRtResponse{
public double value;
public long time;
public UInt16 status;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 48)]
public char[] pointName;//
};//函数 [DllImport("efEDClient.dll", EntryPoint = "effnEDClientCheckPointInfoByTimeEx", CharSet = CharSet.Unicode)]
public static extern bool effnEDClientCheckPointInfoByTimeEx(ref defefSTReadRtInfoRequest requestBuffer,out defefSTReadRtResponse responseBuffer,[MarshalAs(UnmanagedType.Error)]UInt32 count);//调用defefSTReadRtInfoRequest req=new defefSTReadRtInfoRequest();
char[] arrP = new char[49];
char[] arrServ = new char[48]; arrP = "GDHYSSIS.U31_RTS.1EHC:C47.RO01".ToCharArray();
arrServ = "mlz.pushserv".ToCharArray();
req.pointName = arrP;
//MessageBox.Show(req.pointName.Length.ToString());
req.time = 3;
req.ednaServ = arrServ;
// req.
defefSTReadRtResponse resp;
effnEDClientCheckPointInfoByTimeEx(ref req, out resp, nCount);
//printf("%s,%f,%d,%d\n",resp[i].pointName,resp[i].value,resp[i].status,resp[i].time);
string p = new string(resp.pointName);
MessageBox.Show(p+"值:"+resp.value.ToString());//---------catch内容是:
未能封送类型,因为嵌入数组实例的长度与布局中声明的长度不匹配
#define EFMI_POINTNAMELENGTH 48
//结构
typedef struct defefSTReadRtInfoRequest{
long time;
char pointName[EFMI_POINTNAMELENGTH+1];
char ednaServ[EFMI_POINTCOMMLENGTH+1];
}efSTReadRtInfoRequest;//****************************************************************//****************************************************************
typedef struct defefSTReadRtResponse{
double value;
long time;
unsigned short status;/////////////////////////////////////////
char pointName[EFMI_POINTNAMELENGTH+1];//点名,扩展ID
}efSTReadRtInfoResponse;函数:
BOOL effnEDClientCheckPointInfoByTimeEx(
efSTReadRtInfoRequest*pReqBuffer,
efSTReadRtInfoResponse * pResBuffer,
unsigned long Count
);获取实时数据。
//c#调用
[StructLayout(LayoutKind.Sequential)]
public struct defefSTReadRtInfoRequest
{
public long time;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 49)]
public char[] pointName;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 48)]
public char[] ednaServ;
}//****************************************************************//****************************************************************
[StructLayout(LayoutKind.Sequential)]
public struct defefSTReadRtResponse{
public double value;
public long time;
public UInt16 status;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 48)]
public char[] pointName;//
};//函数 [DllImport("efEDClient.dll", EntryPoint = "effnEDClientCheckPointInfoByTimeEx", CharSet = CharSet.Unicode)]
public static extern bool effnEDClientCheckPointInfoByTimeEx(ref defefSTReadRtInfoRequest requestBuffer,out defefSTReadRtResponse responseBuffer,[MarshalAs(UnmanagedType.Error)]UInt32 count);//调用defefSTReadRtInfoRequest req=new defefSTReadRtInfoRequest();
char[] arrP = new char[49];
char[] arrServ = new char[48]; arrP = "GDHYSSIS.U31_RTS.1EHC:C47.RO01".ToCharArray();
arrServ = "mlz.pushserv".ToCharArray();
req.pointName = arrP;
//MessageBox.Show(req.pointName.Length.ToString());
req.time = 3;
req.ednaServ = arrServ;
// req.
defefSTReadRtResponse resp;
effnEDClientCheckPointInfoByTimeEx(ref req, out resp, nCount);
//printf("%s,%f,%d,%d\n",resp[i].pointName,resp[i].value,resp[i].status,resp[i].time);
string p = new string(resp.pointName);
MessageBox.Show(p+"值:"+resp.value.ToString());//---------catch内容是:
未能封送类型,因为嵌入数组实例的长度与布局中声明的长度不匹配
c# char == 16 bit
然后用System.Text.Encoding.Default.GetString(buff, 0, buff.Length);命令转换为C#格式的字符串即可
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 49)]
public char[] pointName;
后来我把上面的改成了。
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 49)]
public string pointName;
上面的错误就没有了。但是Out的值不正确。始终为0.实际上是有值的。