2 Visual Components Manuals

Introduction to Visual Components 2.3
}
}
{
}
Contrast 1,VC_HANDLE); = VA_GetContrast(
VA_Srelease(1,VC_HANDLE);
3.3.8.11 Reading Display Information − VA_GetDisplayInfo
This function can be used to query information such as: max. X pixel, max. Y pixel, and the number of bits per
pixel.
Note:
This function can only be used on IPCs and is not supported on SG3 targets.
3.3.8.11.1 Parameter
I/O Parameter Type Meaning
IN enable BOOL This function is only executed if enable is TRUE.
IN VCHandle UDINT The handle returned by VA_Setup.
IN InfoType UDINT
Index of the value to be queried
1 − Number of pixels in the X direction
2 − Number of pixels in the Y direction
3 − Number of bits per pixel
IN Value UDINT Return value of the queried info type
3.3.8.11.2 Example for Automation Basic
(* cyclic program *)
if ready 1 then
VC_HANDLE = VA_Setup(1 "vga") ,
VC_HANDLE if 0 then
ready = 1
endif
endif
if ready = 1 then
VA_Saccess(1,VC_HANDLE)= if
0 then
endif
VA_GetDisplayInfo (1,VC_HANDLE,InfoType,
UDINT(adr(Value)))
VA_Srelease(1,VC_HANDLE)
endif
3.3.8.11.3 Example for C Programming
#include
#include
#include
UINT _GLOBAL ready;
UDINT _GLOBAL InfoType;
UDINT _GLOBAL Value
unsigned long VC_HANDLE;
_CYCLIC void Cyclic(void)
{
if (!ready)
{
VC_HANDLE = VA_Setup(1 "vga"); ,
if (VC_HANDLE)
ready = 1;
}
if (ready)
{
if (!VA_Saccess(1,VC_HANDLE))
{
VA_GetDisplayInfo(1,VC_HANDLE,InfoType,&Value
);
3.3.8.11 Reading Display Information − VA_GetDisplayInfo 147