Opening the TWAIN Source

Before the application performs any scanning operation, the user is offered a list of available scanning devices from which to choose, in the event that there is more than one. OpenSource Method() displays the TWAIN Select Source dialog box with a list of available scanning devices.

You have to call this function before calling any other functions.

You can create your own dialog box for Data Source Selection by using the GetDSInfo Method to obtain the list of TWAIN Data Sources available on the computer. When the user chooses a Data Source, your application opens the selected Data Source using OpenSource Method.