Machine Vision Camera SDK (C) Developer Guide
[IN] Device handle, which is returned by MV_CC_CreateHandle or
MV_CC_CreateHandleWithoutLog .
nAccessMode
[IN] Device access mode, it is exclusive mode by default, see the table below for details.
Macro Definition
Value
Description
MV_ACCESS_Exclusive
1
Exclusive permission, for other apps, the
CCP register is only allowed to be read
MV_ACCESS_ExclusiveWithSwitch
2
Preempt permission in mode 5, and then
open with exclusive permission
MV_ACCESS_Control
3
Control permission, for other apps, all
registers are allowed to be read
MV_ACCESS_ControlWithSwitch
4
Preempt permission in mode 5, and then
open with control permission
MV_ACCESS_ControlSwitchEnable
5
Open with control permission that can
be preempted
MV_ACCESS_
ControlSwitchEnableWithKey
6
Preempt permission in mode 5, and then
open with control permission that can
be preempted
MV_ACCESS_Monitor
7
Open device with reading mode, suitable
under control permission
nSwitchoverKey
[IN] Key for switching permissions, it is null by default, and it is valid when access mode
supports permission switching (2/4/6 mode).
Return Value
Return MV_OK(0) on success, and return Error Code on failure.
Remarks
● You can find the specific device and connect according to inputted device parameters.
● When calling this API, the parameters nAccessMode and nSwitchoverKey are optional, and the
device access mode is exclusive by default. Currently the device does not support the following
preemption modes: MV_ACCESS_ExclusiveWithSwitch, MV_ACCESS_ControlWithSwitch, and
MV_ACCESS_ControlSwitchEnableWithKey.
● For USB3Vision device, the parameters nAccessMode and nSwitchoverKey are invalid.
See Also
MV_CC_CloseDevice
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