Basic knowledge of MFC

Ccombox ::

Set a pointer to idc_combo1 and fill the drop-down box with addstring:

Ccombobox * pcomb = NULL;
Pcomb = (ccombobox *) This-> getdlgitem (idc_combo1 );
Pcomb-> addstring ("COM1 ");
Pcomb-> addstring ("com2 ");
Pcomb-> addstring ("com3 ");

Obtain the index in the drop-down box and assign its value to a variable:

 

Index = pcomb-> getcursel ();
Pcomb-> getlbtext (index, value );

Set the value of the text box:

 

Cstring strtemp;
Getdlgitemtext (idc_combo, strtemp );
Strtemp + = "";
Setdlgitemtext (idc_combo, strtemp );

Status Bar ):

In the status bar, add a window (id_statusbar_str) with the value of "test". First, find the struct of indicators in mainfrm, and then

Add "id_statusbar_str" to the struct as follows:

 

Static uint indicators [] =
...{
Id_separator, // status line indicator
Id_indicator_caps,
Id_indicator_num,
Id_indicator_scrl, id_statusbar_str,
};

Of course, you can also add the status bar form (id_statusbar_str) to "resource symbols" in "View" A menu. The following code can be used:

Dynamically change the value of the status bar window (id_statusbar_str) in the program:

 

Cclientdc DC (this );
Size size = Dc, gettextextent ("test successfully pulled! ");
Int Index = m_wndstatusbar.commandtoindex (id_status );
M_wndstatusbar.setpanelinfo (index, id_status_str, sbps_popout, size. CX );
M_wndstatusbar.setpaneltext (index, _ T ("test pulled successfully! ", True );

Image processing:

DC & GDI

DC means the device environment. The full name of GDI is graphics device interface, which is the graphical device interface.

DC is used to complete the drawing, and GDI is used to complete the drawing. Therefore, DC should be initialized before the Drawing Object is initialized.

 

Base Class	Cobject
DC type	CDC
Derived class	Cpaintdc	Cclientdc	Cwindowsdc	Cmetafiledc

Differences between cwindowsdc and cpaintdc and cclientdc:

1. The cwindows class can plot in the customer and non-customer areas, while cpaintdc and cclientdc can only plot in the customer area, so cwindows

To be used in the mainfrm class, use in the veiwl class cannot be used in non-customer areas;

2. The cwindows class creates coordinates throughout the screen, while the cpointdc and cclientdc create coordinates in the customer zone.

Drawing equipment (GDI ):

Base Class	Cgdiobject
Derived class	Cpen	Cbrush	Cfont	Cbitmap	Crgn	Cpalette

Steps for using the drawing class:

1. Define a GDI object (such as cpen and cbrush), and then call the corresponding functions (such as createpen and creatsolidbrush) to create this GDI

Object.

2. Select the constructed GDI object from the member function selectobjiect () of the device environment class to the current environment, and

Save the image;

3. After the drawing is complete, restore the original GDI object in the current device environment, that is, use the selectobjict member function of the device environment class

Reselect.

The following is an example of a cpen plot:

Cpen pen;

Pen. creatpen (OS _solid, 1, RGB (255, 0, 0 ));

Cpen * poldpen = PDC-> selectobjiect (& pen );

......

PDC-> selectobjiect (poldpen );

Change the font size of the Edit Control:

Cclientdc DC (this );
Cedit * pedit = (cedit *) getdlgitem (idc_edit1 );
Cfont * font = new cfont;
Font-> createpointfont (400, _ T (" 文 "), & DC );
If (pedit)
...{
Pedit-> setfont (font, true );
}
Else
Afxmessagebox ("failed ");

 

Obtain the Application Path:

 

Lptstr lppath = new char [max_path];
Getcurrentdirectory (max_path, lppath );
Strpath = lppath;
Strpath + = "//";
Strpath + = "test. ini ";