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
#define INCL_GPIDEFAULTS /* Or use INCL_GPI, INCL_PM, */ #include <os2.h> HPS hps; /* Presentation-space handle. */ PARCPARAMS parcpArcParams; /* Default arc parameters. */ BOOL rc; /* Success indicator. */ rc = GpiQueryDefArcParams(hps, parcpArcParams);
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;