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The ExtEscapefunction allows applications to communicate directly with display device drivers. This function has the same definition in Windows CE as on Win32-based platforms.
int ExtEscape( HDC hdc, int nEscape, int cbInput, LPCSTR lpszInData, int cbOutput, LPSTR lpszOutData);
Parameters
- hdc
- A handle to a device context.
- nEscape
- The escape code.
- cbInput
- The number of bytes of input data.
- lpszInData
- A pointer to the input data.
- cbOutput
- The number of bytes of output data.
- lpszOutData
- A pointer to the output data.
Remarks
This function passes its arguments to a display driver's DrvEscapefunction, allowing applications to request actions by a display driver that have no corresponding expression in terms of GDI calls. Windows CE currently defines the following unique escape codes for use with ExtEscape:
Escape Code Meaning GETVFRAMEPHYSICAL Returns the physical address of the video frame buffer. GETVFRAMELEN Returns the length of the video frame buffer. DBGDRIVERSTAT Returns driver statistics. SETPOWERMANAGEMENT Sets the power management mode, for drivers or display hardware that support suspend/auto-shutoff modes. GETPOWERMANAGEMENT Returns the current power management mode. In general, only OEMs should make use of these escape codes. IHVs do not typically need them. Support for these codes in the sample video drivers varies; the sample drivers do not all implement these codes, and some drivers only implement some of these codes.
Requirements
Runs on Versions Defined in Include Link to Windows CE OS 2.10 and later
Last updated on Tuesday, July 13, 2004