ContrastControl (Windows Embedded CE 6.0)
1/6/2010
This function is used to modify the display contrast. This function must be implemented by the driver developer when it is needed.
Syntax
BOOL ContrastControl(
ULONG cmd,
ULONG * pValue
);
Parameters
cmd
Specifies the command to perform that is related to display contrast. This can be one of the following:- CONTRAST_CMD_GET - indicates to retrieve the contrast value.
- CONTRAST_CMD_SET - indicates to set the contrast value.
- CONTRAST_CMD_INCREASE - indicates to increment the contrast value.
- CONTRAST_CMD_DECREASE - indicates to decrement the contrast value.
- CONTRAST_CMD_DEFAULT - indicates to set contrast to the default value provided by the OEM in OEM_INFO.
- pValue
A buffer that varies based on the value passed in to cmd. If cmd is CONTRAST_CMD_GET, CONTRAST_CMD_INCREASE, or CONTRAST_CMD_DECREASE, then on return pValue contains the new contrast value. If cmd is CONTRAST_CMD_SET, then it is an [in] parameter that specifies the new contrast value to set.
Return Value
TRUE indicates success. Otherwise, FALSE is returned, and GetLastError can be used to obtain error information.
Remarks
GPE-based display drivers must implement this method in order to support user-controllable display contrast.
Requirements
| Header | gpe.h |
| Library | Gpe_lib.lib |
| Windows Embedded CE | Windows CE .NET 4.2 and later |