得到系统设置,如调色板的颜色数(100分)

紧急!紧急! 谁知道如何获得系统的配置的参数,如当前显示设置中的调色板,
是256色,或是16位色,如何调用 ??????(而且最好当系统参数改变时,
就能得到此消息)

看看getdevicecaps的帮助就知道了

The WM_DISPLAYCHANGE message is sent to all windows when the display resolution has changed.
WM_DISPLAYCHANGE
cBitsPerPixel = wParam;
cxScreen = LOWORD(lParam);
cyScreen = HIWORD(lParam);

Parameters
cBitsPerPixel
Specifies the new image depth of the display in bits per pixel.
cxScreen
Specifies the new horizontal resolution of the screen.
cyScreen
Specifies the new vertical resolution of the screen.

ChangeDisplaySettings 更改设置,
LONG ChangeDisplaySettings(
LPDEVMODE lpDevMode,
DWORD dwflags
);

Parameters
lpDevMode
Pointer to a DEVMODE structure that describes the graphics mode to switch to. The dmSize member must be initialized to the size, in bytes, of the DEVMODE structure. The following fields in the DEVMODE structure are used:
Member Meaning
dmBitsPerPel Bits per pixel
dmPelsWidth Pixel width
dmPelsHeight Pixel height
dmDisplayFlags Mode flags
dmDisplayFrequency Mode frequency

In addition to setting a value in one or more of the preceding DEVMODE members, you must also set the appropriate flags in the dmFields member. The flags indicate which members of the DEVMODE structure are used for the display settings change. If the appropriate bit is not set in dmFields, the display setting will not be changed. Set one or more of the following flags:
Flag Meaning
DM_BITSPERPEL Use the dmBitsPerPel value.
DM_PELSWIDTH Use the dmPelsWidth value.
DM_PELSHEIGHT Use the dmPelsHeight value.
DM_DISPLAYFLAGS Use the dmDisplayFlags value.
DM_DISPLAYFREQENCY Use the dmDisplayFrequency value.

If lpDevMode is NULL, all the values currently in the registry will be used for the display setting. Passing NULL for the lpDevMode parameter is the easiest way to return to the default mode after a dynamic mode change.
dwflags
Indicates how the graphics mode should be changed. May be one of the following:
Flag Meaning
0 The graphics mode for the current screen will be changed dynamically.
CDS_UPDATEREGISTRY The graphics mode for the current screen will be changed dynamically and the graphics mode will be updated in the registry. The mode information is stored in the USER profile.
CDS_TEST The system tests if the requested graphics mode could be set.

If CDS_UPDATEREGISTRY is specified and it is possible to change the graphics mode dynamically, the information is stored in the registry and DISP_CHANGE_SUCCESSFUL is returned. If it is not possible to change the graphics mode dynamically, the information is stored in the registry and DISP_CHANGE_RESTART is returned.
Windows NT: If the information could not be stored in the registry, the graphics mode is not changed and DISP_CHANGE_NOTUPDATED is returned.
Specifying CDS_TEST allows an application to determine which graphics modes are actually valid, without causing the system to change to that graphics mode.

Return Values
Returns one of the following values:
Value Meaning
DISP_CHANGE_SUCCESSFUL The settings change was successful.
DISP_CHANGE_RESTART The computer must be restarted in order for the graphics mode to work.
DISP_CHANGE_BADFLAGS An invalid set of flags was passed in.
DISP_CHANGE_FAILED The display driver failed the specified graphics mode.
DISP_CHANGE_BADMODE The graphics mode is not supported.
DISP_CHANGE_NOTUPDATED Windows NT only: Unable to write settings to the registry.

另外: EnumDisplaySettings 返回可以使用的显示设置
BOOL EnumDisplaySettings(
LPCTSTR lpszDeviceName, // specifies the display device
DWORD iModeNum, // specifies the graphics mode
LPDEVMODE lpDevMode // points to structure to receive settings
);

Parameters
lpszDeviceName
Pointer to a null-terminated string that specifies the display device whose graphics mode the function will obtain information about.
This parameter can be NULL. A NULL value specifies the current display device on the computer that the calling thread is running on.
If lpszDeviceName is not NULL, the string must be of the form //./DisplayX, where X can have the values 1, 2, or 3.
Windows 95: lpszDeviceName must be NULL.
iModeNum
Index value that specifies the graphics mode for which information is to be obtained.
Graphics mode indexes start at zero. To obtain information for all of a display device's graphics modes, make a series of calls to EnumDisplaySettings, as follows: Set iModeNum to zero for the first call, and increment iModeNum by one for each subsequent call. Continue calling the function until the return value is FALSE.
When you call EnumDisplaySettings with iModeNum set to zero, the operating system initializes and caches information about the display device. When you call EnumDisplaySettings with iModeNum set to a non-zero value, the function returns the information that was cached the last time the function was called with iModeNum set to zero.
lpDevMode
Pointer to a DEVMODE structure into which the function stores information about the specified graphics mode.
The EnumDisplaySettings function sets values for the following five DEVMODE members:
dmBitsPerPel
dmPelsWidth
dmPelsHeight
dmDisplayFlags
dmDisplayFrequency

to cytwon:
问题的标题是:如何获得设置.
not 更改设置.

teargirl: 你们都获得完了, 我只好更改了

接受，万分感谢！！

多人接受答案了。