Programming MSFlexGrid in MFC (VC++)

//This function is called to update the grid whenever a user leaves a cell

//after making some changes to any cell of the grid.

void CEditGrid::OnUpdateGrid()

{

//Check to see if edit is visible

BOOL bVisible = ::GetWindowLong(m_edit.GetSafeHwnd(), GWL_STYLE) & WS_VISIBLE;

if (bVisible)

{

CString cStr;

m_edit.GetWindowText(cStr);

SetText(cStr);

m_edit.SetWindowText("");

m_edit.ShowWindow(SW_HIDE);

GetTextGrid(); //This function is called from here to get the //multiple digit inputs from the grid

}

}

Next we need to set up the part of the program that saves the entered data. In the handler for the OK button of the dialog box, provide the following code:

void CDLGFLEXGRID::OnOK()

{

CString inpx[50];

CString inpy[50];

FILE *fp;

// TODO: Add extra validation here

int k = m_grid.count;

int f = m_grid.i;

int g = m_grid.j;

int a , b;

a = 0;

b = 0;

fp = fopen("dat.txt", "w");

for(int q = 0; q < f; q++)

{

inpx[a] = m_grid.inputx[q][0];

fprintf(fp, " a=%d %dn",a,atoi(inpx[a]) );

a++;

}

for(int m = 0;m < g; m++)

{

inpy[b] = m_grid.inputy[m][1];

fprintf(fp, " b=%d %dn",b,atoi(inpy[b]));

b++;

}

fclose(fp);

CDialog::OnOK();

}

The first step is to declare the arrays to hold values of the two columns. Here the arrays are named inpx and inpy. Then the total count of the cells, the count of two columns, is retrieved.

The next step is to open the file to write out the input values. To do so, the example makes use of conventional File I/O API. Then the arrays (inpx and inpy) are populated with the values of the two columns. The arrays are populated by iterating over the values of the instance level arrays containing the values entered by the user. Finally, each value is converted to an integer and saved in the file.

That completes the small application that makes use of FlexGrid. However, this leaves a question regarding the serialization of the values in MFC. The answer is there is an API to do so. That will be discussed in the future. Till then...