MFC BASIC Programming VS2015 Latest 03

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One, number (floating point or integer) to text:
A) If you convert to a narrow character string, the sprintf function is very useful, and the floating-point number is fine.
b) If you convert to a wide character string, Cstring::format can be implemented in MFC;
c) wsprintf is the Windows API and does not support floating-point format output;
D) If you convert to a wide character string, you can use sprintf to convert to a narrow character string in WIN32;
Then call MultiByteToWideChar's API function to convert to a wide character string.
e) _stprintf is Microsoft's new API in recent years to directly convert floating-point or integer-to-wide character strings.

Second, Unicode and multi-character strings are converted to each other:
A) MultiByteToWideChar: is the conversion of Unicode to a multi-character string;
b) WideCharToMultiByte: is to convert a multi-character set to a Unicode string;
c) _bstr_t (Comutil.h) class can deposit and withdraw two kinds of strings at any time;

Third, the composition of MFC:
A) must have a derived class of CWinApp;
b) An object Theapp must be defined globally with a derived class;
c) The InitInstance virtual function must be overridden in a derived class;
d) The MFC program uses the InitInstance virtual function in the CWinApp derived class as the main function;

Four, MFC dialog box Program message processing (message mapping mechanism)
A) Create a CDialog or CDialogEx derived class associated with it for a dialog box template;
b) When you need to start a dialog box, define an object with a derived class, and invoke the DoModal member function with the object;
C) MFC If you want to process a message, just open the Class Wizard and select the dialog box class in the dropdown;
d) In the message list you can select the message you need, double-click to establish a message map function;
e) The message map function is: A message (and a window) corresponding to the address of a function

V. MFC base Variable Type:
A) CPoint (Point derived class): Record and replace x, y coordinates; for example: CPoint pt (32,52);
b) CSize (Size derived class): Record and replace cx,cy aspect; for example: CSize pt (32,52);
c) CRect (Rect derived class): Record and replace left,right,top,bottom aspect; for example: CSize pt (32,52);
D) CString: Class for recording and changing strings
e) Some data collection classes: For example: CList CArray cmap and so on;

MFC BASIC Programming VS2015 Latest 03