USB programming newbie - help

Hi,
I am new to USB programming and need advice on which path to follow, writing a USB - enabled application. What API's if any are available for user-space USB programming? e.g. I want to incorporate code in an app I am writing to control a USB PAN-TILT servo for a web cam.
My thanks in advance.

neok wrote:
Hi,
I am new to USB programming and need advice on which path to follow, writing a USB - enabled application. What API's if any are available for user-space USB programming? e.g. I want to incorporate code in an app I am writing to control a USB PAN-TILT servo for a web cam.
My thanks in advance.
OK thanks for the tips, looks like libusb is the way to go. The device is a Phidget servo controller but for various reasons I prefer to avoid libphidget21 even though it did work for me.

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On one level, like the others, I am interested in beginning programming for my own personal interest and hobby. I want to be able to poke around building stuff for my Mac as I see the need. The second driver however, is a professional one; I work as a management consultant within an IT company.
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How to created Freely Programmed F4 help in Select Options

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Thanks and Best Regards

Hi Haung,
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Regards,
Rama

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How to add Freely programmed input help in FPM Search UIBB?

Hi Experts!
We have a requirement to create search UIBB in which the input field should have a freely programmed input help.
I see that WD_VALUE_HELP parameter can be set to the component name and it displays the freely programmed help as well in the application.
However, I am still digging to implement the search help open and close events of the component.
I have used the Freely programed value help standard demo object " FREE_VALUE_HELP " which shows the value in the help popup however, the selected value is not returned in the input field.
I am also unable to find any Interface as provided for implementing OVS in search UIBB as well...
Please help.

Hi Aliaksandr,
Thanks for your response.
I have checked this WDA application demo_value_help .... but it is a normal WDA application.
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I found that we can provide the component name used as freely programmed search help in the attribute WD_VALUE_HELP of Interface IF_FPM_GUIBB_SEARCH.
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Problem in Select Option Freely programmed F4 Help

Hi All,
I had a Component 'A' where i used select option. I used Freely programmed search help for the select option field.
If i click F4 in the select option field it will call one component in which i have one more select option in component B.
In component B select option field if i manually entering value and search and click apply values button the values are comming in the select option field in component A.
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Help required on Freely Programmed Input help

Dear all,
I have developed a component, say comp1, in which i have implemented the interface IWD_VALUE_HELP.
In the respective view(MAIN) of Comp1 i have a dropdown which contains a list of company codes fetched from T001 table.
Apart from these two, I have also embedded the Main view into the window WD_VALUE_HELP.
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After this, I have created the application for my component Comp2. When i run the application and when i press F4 on the input field i am able to get the window from Comp1 component, and a dropdown with values.
Now the question is, How can i pass the value selected in that window of Comp1 into the input field of Comp2? we do the same in OVS, when ever a value is selected from the Hitlist, it will be cascaded into the input field, just like that i want to do here.
Please suggest me how to do this, and also please tell when to go for Freely programmed Input help and its advantages.
Thank you,
Shashi.

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That is easy to do because the framework passes all the information you need into the freely programmed input help via the value_help_listener object.
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set single attribute
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exporting
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Freely Programmed Search Help

Hi there,
I have a WebDynpro application with two fields. The first field has Dictionary search Help on it.
The second field has a Freely Programmed input help. The problem I am faced with is that the freely programmed search relies on the value of the first field to determine it's own values - i.e The first field is a contract, and the second field is an item on the contract. So if the contract changes, so should the list of items provided in the Help.
Now the way that this works is that the user selects a contract, then selects an item, then completes the fields in a PDF document.
They press the button Save and Clear which saves the data, clears all the fields, and is then ready for the next lot of data.
Although I can clear out all the fields, I don't know how to trigger the refresh of the Freely Programmed help. The first time it is used it gets the right data, and after that it always shows the same data, - I just don't know how to trigger a refresh. Basically I want it to refresh every time it is used!!
Many thanks
Jack

Hello Jack,
hmm... it should refresh itself, because you determine what goes in and out. Probably, you need to clean up some nodes in your freely programmed search help component as well i.e. upon leaving.
Best regards,
Thomas

Freely Programmed Value Help

Hi,
I am just getting an error in Freely Programmed Value Help and i have created two Component and i am just getting an error in first component as WD_COMP_CONTROLLER->VALUE_HELP_LISTENER->CLOSE_WINDOW( ). is Unknown. I hope you Understand my Question. Please find me a Solution.
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Sadiq.

Hi Bhaskar,
Thanks for your reply as you told that i have Initialized in Attributes as VALUE_HELP_LISTENER, but i can't resolve it.
Regards,
Sadiq.

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