Programming Windows Programming Guide-> Chapter 5 example program 1

/*_##################################### #######################################
_##
### Programming Windows Programming Design Guide-> Chapter 5 example program 1
_ ## Author: xwlee
_ ## Time: 2007.06.17
### Chang'an University
_ ## Development condition: win2003 SERVER + vc6.0
_##
_ ## Program 5-1 devcaps
_ ## Devcaps. c file
### When the program displays a video display device environment as a parameter,
### Some information that can be obtained from the getdevicecaps Function
_##
_##
_##
_##
_##
_##
_ ## Devcaps. c -- device capabilities display program No. 1
_ ## (C) Charles Petzold, 1998
_##
_####################################### ###################################*/

# Include <windows. h>

# Define numlines (INT) (sizeof devcaps/sizeof devcaps [0])

Struct

{

Int iindex;

Tchar * szlabel;

Tchar * szdesc;

}

Devcaps [] =
{
// The actual screen width in millimeters
Horzsize, text ("horzsize"), text ("width in millimeters :"),

// The actual screen height in millimeters
Vertsize, text ("vertsize"), text ("height in millimeters :"),

Horzres, text ("horzres"), text ("width in pixels :"),

Vertres, text ("vertres"), text ("height in raster lines :"),

Bitspixel, text ("bitspixel"), text ("color bits per pixel :"),

Planes, text ("planes"), text ("Number of color planes :"),

Numbrushes, text ("numbrushes"), text ("Number of device Brushes :"),

Numpens, text ("numpens"), text ("Number of device pens :"),

Nummarkers, text ("nummarkers"), text ("Number of device markers :"),

Numfonts, text ("numfonts"), text ("Number of device fonts :"),

Numcolors, text ("numcolors"), text ("Number of device colors :"),

Pdevicesize, text ("pdevicesize"), text ("size of device structure :"),

// Finally, the other three values from getdevicecaps are related to the video size. Aspectx, aspecty, and aspectxy
// The value is the relative width, height, and diagonal line of each pixel, rounded to an integer. For square pixels,
// The aspectx and aspecty values are the same. In any case, the aspectxy value should be equal to the sum of the squares of aspectx and aspecty
// Square root, just like a right triangle.
Aspectx, text ("aspectx"), text ("relative width of pixel :"),
Aspecty, text ("aspecty"), text ("relative height of pixel :"),
Aspectxy, text ("aspectxy"), text ("relative diagonal of pixel :"),

Logpixelsx, text ("logpixelsx"), text ("Horizontal dots per inch :"),

Logpixelsy, text ("logpixelsy"), text ("vertical dots per inch :"),

Sizepalette, text ("sizepalette"), text ("Number of palette entries :"),

Numreserved, text ("numreserved"), text ("Reserved palette entries :"),

Colorres, text ("colorres"), text ("actual color resolution :")

};

 

Lresult callback wndproc (hwnd, uint, wparam, lparam );

Int winapi winmain (hinstance, hinstance hprevinstance,
Pstr szcmdline, int icmdshow)
{
Static tchar szappname [] = text ("devcaps1 ");
Hwnd;
MSG;
Wndclass;

Wndclass. Style = cs_hredraw | cs_vredraw | cs_owndc;
Wndclass. lpfnwndproc = wndproc;
Wndclass. cbclsextra = 0;
Wndclass. cbwndextra = 0;
Wndclass. hinstance = hinstance;
Wndclass. hicon = loadicon (null, idi_application );
Wndclass. hcursor = loadcursor (null, idc_arrow );
Wndclass. hbrbackground = (hbrush) getstockobject (white_brush );
Wndclass. lpszmenuname = NULL;
Wndclass. lpszclassname = szappname;

If (! Registerclass (& wndclass ))
{
MessageBox (null, text ("this program requires Windows NT! "),
Szappname, mb_iconerror );
Return 0;
}

Hwnd = createwindow (szappname, text ("device capabilities "),
Ws_overlappedwindow,
Cw_usedefault, cw_usedefault,
Cw_usedefault, cw_usedefault,
Null, null, hinstance, null );

Showwindow (hwnd, icmdshow );
Updatewindow (hwnd );

While (getmessage (& MSG, null, 0, 0 ))
{
Translatemessage (& MSG );
Dispatchmessage (& MSG );
}

Return msg. wparam;
}

 
Lresult callback wndproc (hwnd, uint message, wparam, lparam)
{
Static int cxchar, cxcaps, cychar;
Tchar szbuffer [10];
HDC;
Int I;
Paintstruct pS;
Textmetric TM;

Switch (Message)
{
Case wm_create:
HDC = getdc (hwnd );

Gettextmetrics (HDC, & TM );
Cxchar = TM. tmavecharwidth;
Cxcaps = (TM. tmpitchandfamily & 1? 3: 2) * cxchar/2;
Cychar = TM. tmheight + TM. tmexternalleading;

Releasedc (hwnd, HDC );
Return 0;

Case wm_paint:
HDC = beginpaint (hwnd, & PS );
For (I = 0; I <numlines; I ++)
{
Textout (HDC, 0, cychar * I,
Devcaps [I]. szlabel,
Lstrlen (devcaps [I]. szlabel ));

Textout (HDC, 14 * cxcaps, cychar * I,
Devcaps [I]. szdesc,
Lstrlen (devcaps [I]. szdesc ));

Settextalign (HDC, ta_right | ta_top );
Textout (HDC, 14 * cxcaps + 35 * cxchar, cychar * I, szbuffer,
Wsprintf (szbuffer, text ("% 5d "),
Getdevicecaps (HDC, devcaps [I]. iindex )));

Settextalign (HDC, ta_left | ta_top );
}

Endpaint (hwnd, & PS );
Return 0;

Case wm_destroy:
Postquitmessage (0 );
Return 0;
}

Return defwindowproc (hwnd, message, wparam, lparam );
}