C / C++ / MFC

Trupti Mehta wrote:

// Assignment operator
DeptDetails& operator=(const DeptDetails &d) {
deptNo = d.GetDeptNo();
deptName = d.GetDeptName();
vat = d.GetVat();

return *this;
}

DeptDetails& DeptDetails::operator=(const DeptDetails &d)

void DbOperations::WriteDepartments(CMapStringToPtr dptMap)
{
	HANDLE hFile = CreateFile(DEPT_FILE,
	     GENERIC_WRITE, FILE_SHARE_WRITE,
         NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

	if (hFile == INVALID_HANDLE_VALUE)
		AfxMessageBox(_T("Error OPeniong File"));
	else {
		CFile myfile((int)hFile);
		CString key;
		DeptDetails* dd;

		CArchive ar(&myfile, CArchive::store);

		for (POSITION pos = dptMap.GetStartPosition(); pos != NULL;) {
			dptMap.GetNextAssoc(pos, key, (DeptDetails&)dd ); //.GetNextAssoc(pos, key, (DeptDetails*&)dd);
			dd->Serialize(ar);		
		}
		
		key.Empty();
		dd->~DeptDetails();
		myfile.Close();
	}

	return;
}

error C2664: 'GetNextAssoc' : cannot convert parameter 3 from 'class DeptDetails *' to 'void *& '
        A reference that is not to 'const' cannot be bound to a non-lvalue
Error executing clarm.exe.

Trupti Mehta wrote:

dptMap.GetNextAssoc(pos, key, (DeptDetails& [Wink] dd ); //.GetNextAssoc(pos, key, (DeptDetails*& [Wink] dd);

DeptDetails* dd;
...
dptMap.GetNextAssoc(pos, key, ((CObject*&)dd);

Trupti Mehta wrote:

How to resolve this error yet? Do i have to write another operator= for DeptDetails*. Can you let me know the code so I don't make mistake again.

Trupti Mehta wrote:

One more query I have:
I wanted to store deptNo (int) as key & DeptDetails as value in a Map. I looked at CMap but couldn't find any method to iterate the map contents, hence selected CMapStringToPtr seemed to be best suited to store deptNo in the form of CString. Is this decision correct or should I approach some other class of CMap.

class DeptDetails : public CObject
{
	DECLARE_SERIAL(DeptDetails);

public:
	DeptDetails(void);
	DeptDetails(int dno, CString name, float vat);
	DeptDetails(const DeptDetails &d);	// Copy Constructor
	// = Assignment operator
	DeptDetails& operator=(const DeptDetails &d);

IMPLEMENT_SERIAL(DeptDetails, CObject, 1);

DeptDetails::DeptDetails(void)
: deptNo(0)
, deptName(_T(""))
, vat(0)
{
}

DeptDetails::DeptDetails(int dno, CString name, float vat) {
	deptNo = dno;
	deptName = name;
	this->vat = vat;
}

// Copy Constructor
DeptDetails::DeptDetails(const DeptDetails &d) {
	deptNo = d.deptNo;
	deptName = d.deptName;
	vat = d.vat;
}

// Assignment operator
DeptDetails& DeptDetails::operator=(const DeptDetails &d) {
	deptNo = d.deptNo;
	deptName = d.deptName;
	vat = d.vat;
	
	return *this;
}

class DbOperations  
{
public:
	CMap<int, int, DeptDetails, DeptDetails> deptMap; // = new CMapStringToOb;
	void WriteOperators(CMap<int, int, OperatorDetails, OperatorDetails> opdtMap);

void DbOperations::WriteDepartments(CMap<int, int, DeptDetails, DeptDetails> dptMap)
{
	HANDLE hFile = CreateFile(DEPT_FILE,
	     GENERIC_WRITE, FILE_SHARE_WRITE,
         NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

	if (hFile == INVALID_HANDLE_VALUE)
		AfxMessageBox(_T("Error OPeniong File"));
	else {
		CFile myfile((int)hFile);
		int key;
		DeptDetails dd;

		CArchive ar(&myfile, CArchive::store);

		for (POSITION pos = dptMap.GetStartPosition(); pos != NULL;) {
			dptMap.GetNextAssoc(pos, key, dd ); 
			ar.WriteObject(&dd);
		//	dd.Serialize(ar);		
		}
		
		dd.~DeptDetails();
		ar.Close();
		myfile.Close();
	}

	return;
}

CMap<int, int, DeptDetails, DeptDetails> DbOperations::ReadDepartments()
{
	if(deptMap.IsEmpty() == false)
		deptMap.RemoveAll();

	HANDLE hFile = CreateFile(DEPT_FILE,
	     GENERIC_READ, FILE_SHARE_READ,
         NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

	if (hFile == INVALID_HANDLE_VALUE)
		AfxMessageBox(_T("Error OPeniong File"));
	else {
		CFile myfile((int)hFile);
		int key;
		DeptDetails* dd;

		int i;
		myfile.SeekToBegin();
		CArchive ar(&myfile, CArchive::load);

		dd = (DeptDetails*) ar.ReadObject( RUNTIME_CLASS(DeptDetails) );

			
//			  while ( (ar.Read(&dd, sizeof(dd))) != 0) {
//			dd->Serialize(ar);
//			i = dd->GetDeptNo();
//			deptMap.SetAt(i, dd);

			delete dd;
//		}
		
		dd->~DeptDetails();
		myfile.Close();
	}
	
	return deptMap;
}

Trupti Mehta wrote:

// deptMap.SetAt(i, dd);

deptMap.SetAt(i, *dd);

Trupti Mehta wrote:

Have I implemented the CArchive correctly in Write & Read Departments. Please check out that.

Trupti Mehta wrote:

I have come back in VC++ after long time, so many things are new and many out of the mind also. Hope to get this woring correctly at the earliest.

Trupti Mehta wrote:

But the file is writing correctly so I hope reading will also perform correctly only.

Trupti Mehta wrote:

Hope will get help from you in that topic too.

vijay7173 wrote:

When I use Dependency Walker, I see that the exe makes a reference to DWMAPI.dll.

piul wrote:

I know it is a stupid question, but I couldn't find any function that deletes a directory and all its contents.

psychedelic_fur wrote:

Now when I use this header file and try accessing the variable as
APP_CONTANTS:: then the auto complete feature of Visual Studio always shows only the first defined variable.