Relationship between program and DPI in Windows dialog box

1. DPI: the number of pixels per inch. Inches are physical units and pixels are logical units.
2. Windows dialog boxProgramThere are two ways to change the interface size: (1) the value set in the definition dialog box in the RC file. The Unit is dlu, which is proportional to the font size set in the dialog box. (2) Call the setwindowpos function in the wm_initdialog message. The Unit is pixel.
3. Windows Font is measured in lbs, and 1 inch is equal to 72 lbs. When DPI changes, the font size changes accordingly. Therefore, the interface defined in method (1) does not have the problem of text truncation or text being too small. The interface defined in method (2) will have these problems, the font size must be changed dynamically.