GpiQueryDefArcParams
This function returns the default values of the arc parameters, as set by the GpiSetDefArcParams function.
Syntax
GpiQueryDefArcParams(hps, parcpArcParams)
Parameters
- hps (HPS) - input
- Presentation-space handle.
- parcpArcParams (PARCPARAMS) - output
- Default arc parameters.
Return Value
- rc (BOOL) - returns
- Success indicator.
- TRUE - Successful completion
- FALSE - Error occurred.
Errors
Possible returns from WinGetLastError:
- PMERR_INV_HPS (0x207F)
- An invalid presentation-space handle was specified.
- PMERR_PS_BUSY (0x20F4)
- An attempt was made to access the presentation space from more than one thread simultaneously.
Example Code
This example uses GpiQueryDefArcParams to return the default values of the arc parameters, as set by the GpiSetDefArcParams call, and assign a variable to the P coefficient if the query succeeds.
#define INCL_GPIDEFAULTS /* Default functions */ #include <os2.h> BOOL fSuccess; /* success indicator */ HPS hps; /* Presentation-space handle */ ARCPARAMS parcpArcParams; /* Arc parameters */ LONG lPcoefficient; /* p coefficient of arc definition */ fSuccess = GpiQueryDefArcParams(hps, &parcpArcParams); /* if successful, assign value of P coefficient */ if (fSuccess == TRUE) lPcoefficient = parcpArcParams.lP;