pixel to inch or mm

[lzpmail]

hi, in qt embeded, have an function change pixel to inch or mm. before i check qt assisent, i find a QScreen class, it have some information about screen, but i don't know how to use it, anyone have an exam. thanks.

[ChrisW67]

Use the QPainter to get the QPaintDevice and then use the various metrics it provides. These may not be entirely reliable though.

[JoZCaVaLLo]

First take a look at this thread
http://www.qtcentre.org/threads/1559...een-pixel-size

then if you can't get it

int PixelWidthDimension = myWidget->logicalDpiX();  //width dots per inch
int PixelHeightDimesion = myWidget->logicalDpiY();  //width dots per inch
 
double inch = (double)myWidthInPixel / (double)PixelWidthDimension;

int PixelWidthDimension = myWidget->logicalDpiX();  //width dots per inch
int PixelHeightDimesion = myWidget->logicalDpiY();  //width dots per inch

double inch = (double)myWidthInPixel / (double)PixelWidthDimension;

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[lzpmail]

thank you, i have finish my program, thanks your help.