c++ - Windows api get client dc bitmap size -


i use following code size of bitmap bound windows mfc view window's client area dc:

void cview::ondraw(cdc* ) {     cdc *pdc = getdc();     bitmap bmpheader;     memset( &bmpheader, 0, sizeof(bitmap));     hgdiobj hbmp = getcurrentobject(pdc->m_hdc, obj_bitmap);     getobject(hbmp,sizeof(bitmap), &bmpheader);      int bmpwidth = bmpheader.bmwidth;     int bmpheight = bmpheader.bmheight;     ... }

according msdn getdc() gets client area dc:

retrieves pointer common, class, or private device context client area depending on class style specified cwnd

so suppose bmpwidth , bmpheight should same size client area rect. isn't. appears size of entire window including toolbar area , menu area. doing wrong here?

there no bitmap in there. use getclientrect find , height of client area. use cdc* provided, or else try cclientdc dc(this). in case drawing should this:

void cmyview::ondraw(cdc* dc) {     crect rc;     getclientrect(&rc);      dc->fillsolidrect(rc, rgb(0, 0, 255)); }

bitmap object not return information window. use window functions information windows.

most window functions have equivalent in mfc. example,

in winapi: getclientrect(hwnd hwnd, lprect rc);

in mfc: cwnd::getclientrect(lprect rc);


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