NVIDIA FX5500 User Guide - Page 82

XNVCTRLQueryAttribute(), False

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CHAPTER 5 API Control ); This function is the same as XNVCTRLSetAttribute(), and returns True if the operation succeeds, otherwise False. XNVCTRLQueryAttribute() Bool XNVCTRLQueryAttribute ( Display *dpy, int screen, unsigned int display_mask, unsigned int attribute, int *value ); This function returns True if the attribute exists, otherwise False. If XNVCTRLQueryAttribute returns True, value will contain the value of the specified attribute. Not all attributes require the display_mask parameter. See "NV_CTRL_GVO Attributes" on page 67 for details. Possible errors: • BadValue - The screen doesnʹt exist. • BadMatch - The NVIDIA driver is not present on that screen. XNVCTRLQueryStringAttribute() Bool XNVCTRLQueryStringAttribute ( Display *dpy, int screen, unsigned int display_mask, unsigned int attribute, char **ptr ); This function returns True if the attribute exists, otherwise False. If XNVCTRLQueryStringAttribute returns True, *ptr will point to an allocated string containing the string attribute requested. It is the callerʹs responsibility to free the string when done. Possible errors: NVIDIA Corporation 78 Quadro FX 4500/5500 SDI User's Guide- Version 2.0

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NVIDIA Corporation
78
Quadro FX 4500/5500 SDI User’s Guide
– Version 2.0
C
HAPTER
5
API Control
);
This function is the same as XNVCTRLSetAttribute(), and returns
True
if the operation
succeeds, otherwise
False
.
XNVCTRLQueryAttribute()
Bool XNVCTRLQueryAttribute (
Display *dpy,
int screen,
unsigned int display_mask,
unsigned int attribute,
int *value
);
This function returns
True
if the attribute exists, otherwise
False
.
If XNVCTRLQueryAttribute returns True, value will contain the value of the specified
attribute. Not all attributes require the display_mask parameter. See
“NV_CTRL_GVO
Attributes” on page 67
for details.
Possible errors:
•
BadValue - The screen doesn
ʹ
t exist.
•
BadMatch - The NVIDIA driver is not present on that screen.
XNVCTRLQueryStringAttribute()
Bool XNVCTRLQueryStringAttribute (
Display *dpy,
int screen,
unsigned int display_mask,
unsigned int attribute,
char **ptr
);
This function returns
True
if the attribute exists, otherwise
False
.
If XNVCTRLQueryStringAttribute returns True, *ptr will point to an allocated string
containing the string attribute requested.
It is
the caller
ʹ
s responsibility to free the string
when done.
Possible errors: