[NW RFC SDK] Manually creating metadata description for RFC_SYSTEM_INFO

Hi,

I am trying to manually create the metadata description for the bapi RFC_SYSTEM_INFO (don't ask why). I have a C++ program that creates the parameters needed for the RfcCreateFunctionDesc api call, it then creates and invokes the function all of these return RFC_OK. The problem is that when I try and get the structure RfcGetStructure I get an RFC_INVALID_PARAMETER error. I have included the test code below does anyone have any ideas what I am doing wrong? I have checked the lengths and offsets on the windows system I am running this on.

Thanks in advance,

Simon

void test {

  RFC_ERROR_INFO errorInfo;

  // First create the structure for RFC_SYSTEM_INFO

  RFC_TYPE_DESC_HANDLE typeDesc = ::RfcCreateTypeDesc(cU("RFCSI_EXPORT"), &errorInfo);

  addFieldType(typeDesc, L"RFCPROTO", RFCTYPE_CHAR, 3, 6, 0, 0);

  addFieldType(typeDesc, L"RFCCHARTYP", RFCTYPE_CHAR, 4, 8, 3, 6);

  addFieldType(typeDesc, L"RFCINTTYP", RFCTYPE_CHAR, 3, 6, 7, 14);

  addFieldType(typeDesc, L"RFCFLOTYP", RFCTYPE_CHAR, 3, 6, 10, 20);

  addFieldType(typeDesc, L"RFCDEST", RFCTYPE_CHAR, 32, 64, 13, 26);

  addFieldType(typeDesc, L"RFCHOST", RFCTYPE_CHAR, 8, 16, 45, 90);

  addFieldType(typeDesc, L"RFCSYSID", RFCTYPE_CHAR, 8, 16, 53, 106);

  addFieldType(typeDesc, L"RFCHOST", RFCTYPE_CHAR, 8, 16, 45, 90);

  addFieldType(typeDesc, L"RFCDATABS", RFCTYPE_CHAR, 8, 16, 61, 122);

  addFieldType(typeDesc, L"RFCSAPRL", RFCTYPE_CHAR, 4, 8, 111, 222);

  addFieldType(typeDesc, L"RFCMACH", RFCTYPE_CHAR, 5, 10, 115, 230);

  addFieldType(typeDesc, L"RFCOPSYS", RFCTYPE_CHAR, 10, 20, 120, 240);

  addFieldType(typeDesc, L"RFCTZONE", RFCTYPE_CHAR, 6, 12, 130, 260);

  addFieldType(typeDesc, L"RFCDAYST", RFCTYPE_CHAR, 1, 2, 136, 274);

  addFieldType(typeDesc, L"RFCIPADDR", RFCTYPE_CHAR, 15, 30, 137, 274);

  addFieldType(typeDesc, L"RFCHOST2", RFCTYPE_CHAR, 32, 64, 156, 312);

  addFieldType(typeDesc, L"RFCSI_RESV", RFCTYPE_CHAR, 12, 24, 188, 376);

  addFieldType(typeDesc, L"RFCIPV6ADDR", RFCTYPE_CHAR, 45, 90, 200, 400);

  ::RfcSetTypeLength(typeDesc, 245, 490, &errorInfo);

  ::RfcCreateStructure(typeDesc, &errorInfo);

  // Create the export parameter RFSCI_EXPORT

  RFC_PARAMETER_DESC pDesc;

  wcsncpy(pDesc.name, cU("RFSCI_EXPORT"), 30);

  pDesc.type = RFCTYPE_STRUCTURE;

  pDesc.direction = RFC_EXPORT;

  pDesc.ucLength = 490;

  pDesc.nucLength = 245;

  pDesc.typeDescHandle = typeDesc;

  RFC_FUNCTION_DESC_HANDLE hMyFunc =  ::RfcCreateFunctionDesc(cU("RFC_SYSTEM_INFO"), &errorInfo);

  ::RfcAddParameter(hMyFunc, &pDesc, &errorInfo);

  RFC_FUNCTION_HANDLE hSystemInfo = ::RfcCreateFunction(hMyFunc, &errorInfo);

  ::RfcInvoke(hConnect, hSystemInfo, &errorInfo);

  RFC_STRUCTURE_HANDLE hStructure = NULL;

  ::RfcGetStructure(hSystemInfo, cU("RFCSI_EXPORT"), &hStructure, &errorInfo); // RFC_INVALID_PARAMETER

}

void addFieldType(RFC_TYPE_DESC_HANDLE typeDesc, std::wstring fieldName, RFCTYPE RFCtype,

  unsigned lengthNUC, unsigned lengthUC, unsigned offsetNUC, unsigned offsetUC) {

  RFC_ERROR_INFO errorInfo;

  RFC_FIELD_DESC pFieldDesc;

  wcsncpy(pFieldDesc.name, fieldName.c_str(), 30);

  pFieldDesc.type = RFCtype;

  pFieldDesc.nucLength = lengthNUC;

  pFieldDesc.ucLength = lengthUC;

  pFieldDesc.ucOffset = offsetUC;

  pFieldDesc.nucOffset = offsetNUC;

  pFieldDesc.decimals = 0;

  pFieldDesc.typeDescHandle = 0;

  pFieldDesc.extendedDescription = NULL;

  ::RfcAddTypeField(typeDesc, &pFieldDesc, &errorInfo);

}