Use the low-level interface function only in cases such as a racing wheel scenario when the user may simultaneously turn the wheel (X-Axis), press Accelerator pedal (Rx Axis), press the Brakes pedal (Ry Axis) and press a few buttons. The vjoy high-level interface functions are quite efficient and unless a large number of controls are expected to change simultaneously it is recommended to use it. Using the latter approach will result in a simpler code and is less sensitive to future changes in the API. The former approach is more efficient than the latter one. Efficiency vs Better code Feeding the vjoy device can be made using a low-level interface function (UpdateVJD) that updates an entire device at once or using a set of high level interface functions each updating a single vjoy device control such as a button or an axis. If your target application (Simulator, game etc.) does not support FFB or if your hardware does not support FFB don't implement it. FFB Support This feature complicates the feeder. In most cases these capabilities are not needed because the user is not expected to make changes while using vjoy. It can react to removal of a vjoy device and to introducing of a device. Device Removal/Insertion The feeder may be designed to detect a change in the vjoy device status. In this case, you the feeder will just have to verify that the device exists, and you can eliminate the vjoy device detection and selection logic. However, in many cases, you can safely assume that the vjoy device you intend to feed is device number One. Try to write a simple as possible a feeder: Device A feeder can feed as many as 16 vjoy device and to select the device to be fed. 1 How to write a vjoy Feeder (C/) Updated: 1 (v2.1.6) Feeder Overview API Feeding the vjoy device Force Feedback support Software Reference Interface Functions Interface Structures Interface Constants Function pointersĢ Feeder Overview A vjoy feeder enables you to feed one or more vjoy devices with position data and optionally to receive Force Feedback (FFB) data from the vjoy device.
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