Design a simple pricing program with MFC

1, the purpose of the experiment

Learn how to create an application using the MFC Application Wizard.

Learn how to create a new dialog box resource.

Learn how to generate dialog boxes.

2. Experimental content

Using the application to create a default dialog box application, in the dialog box can go to the next dialog box, in the New dialog box to complete the calculation of the total price function. As follows:

3, the Experiment Step 1, the new project

Open vs2017, new MFC project

Select based on the dialog box, and then the others are the default settings, click Finish.

2. modifying resources, adding controls

In the resource file, click Mfcdlg.rc

Then expand the Dialog folder and click Dialog to open the dialog box operator interface

To manipulate the dialog interface, you can add controls through the toolbox.

After the control has been truncated modified:

Select the button control, right-click the property, and in the caption of the property, make the following changes, you can see the key display turned into a calculation.

3. Insert a new dialog box template

Insert a new dialog box template below

Set the new dialog box properties as follows,

4. Create a dialog box class

Select the calculation dialog box, right-click, select Add Class

Click OK to generate a Cmydlg.h file

5. Add the control handler for the Open dialog box

Check the Idd_mfcdlg_dialog dialog box and double-click the Calculate button to open the MfcDLG.cpp file

Add handler diamagnetic as follows:

void Cmfcdlgdlg::onbnclickedbutton1 () {    //  TODO: Add control Notification Handler code    CMyDlg dlg;   defines the object of the Cmdlg class Dlg    dlg. DoModal (); // Show dialog Box }

6. Adding controls in the Idd_compute_dialog dialog box

Add three edit box controls at a time, three static text controls, and a button control, as shown below

After adding the finished layout is as follows:

Modify the properties of the Statictext control and the button's property caption to display the following

7. Add member variables for Edit control controls

Select Edit Control, right-click, select Add Variable

Because the input is the price number, so the category selection value, variable type choose float, access is set to public, the name corresponds to M_price\m_number\m_total

When all settings are complete, open Cmydlg.h and you can see that the member variables are already included under the class.

And the member variables are already included in the Cmydlg.cpp.

This is all we do to add member variables, and if you find that you have errors in the process of adding member variables, you can delete the above. h and. cpp in the Red box section, reset, of course, you can also directly through the source code modification.

8. Add Control handler function

In this case, the processing function is relatively simple, double-clicking the calculation button into the control event function, and then adding the code as follows:

void Cmydlg::onbnclickedbutton1 () {    //  TODO: Add control Notification Handler code    UpdateData (True );     = M_price * m_number;    UpdateData (false);}

9. Add Control handler function

Choose Build-to-build solution, then click Debug-and start execution to get the following block diagram

Click Calculate to open the Calculate dialog box

Enter the price, quantity, click Calculate to get the total price.

Design a simple pricing program with MFC