BlackBox Component Builder Forums

I wanted to get the value of the environment variable HOMEPATH. I've found that WinApi.GetEnvironmentVariableW provides that. But in order to make it easier, I've written a wrapper function: PROCEDURE EnvVarValue* (IN pName: ARRAY OF CHAR): POINTER TO ARRAY OF CHAR; (* Returns the value of the envir...

I've been looking at exemplary modules CommObxStreamsServer and CommObxStreamsClient , executing them via theirs docu files: (Q) CommObxStreamsServer.Start (Q) CommObxStreamsClient.SendTextSelection But they didn't work. I've only been able to make them work, by changing the constant localAdr , addi...

I don't know much, but I've heard about subsystem Gr (Data Acquisition and Monitoring Toolbox). It seems to fit your needs. You can download it from http://www.zinnamturm.eu/downloadsDH.htm#Gr See also http://www.pas.rochester.edu/~skulski/Downloads.html http://www.pas.rochester.edu/~skulski/Present...

I am not sure why I need Services.Action and procedure ProcessMessages , but this example manages to show 5 lines, one at a time: TYPE (* Copied from ObxActions *) Action = POINTER TO RECORD (Services.Action) j: INTEGER END; VAR PLp: Plotters.Plotter; PROCEDURE ProcessMessages; (* Chris Burrows *) V...

Thanks, I changed pts[0] to pts . Regarding your question, I've noticed: The call to PLp.Update() inside the loop, doesn't seem to do the drawing of a line; instead the whole graphic seems to be updated completely only when the program finished. If you want to draw 2 lines, I think you'll need 2 var...

I've tried to install subsystem Lib from http://www.zinnamturm.eu, but I've got an error compiling module LibPlot3D: MODULE LibPlot3D; IMPORT Api := WinApi ... ... PROCEDURE (g : SurfGraphic) Restore2 (f : Views.Frame); VAR ... dc, k, res: INTEGER; pts: ARRAY 10 OF Api.POINT; BEGIN ... res := Api.Po...

Sql developer manual: SqlDB.Table ... Note that the field table.rows cannot be computed by all database drivers, some may return MAX(INTEGER) instead. To loop over all rows of a result table, it is therefore better to avoid using table.rows in the loop termination condition. Instead, looping can be ...

The reason of malfunctioning is in module SQLiteDriver.
Table.ReadVarString is returning the pointer to the array of char where the text data read from database is stored.
Instead, a new array should be allocated, filled in with data, and returned.

This problem happens to me with module SQLiteDriver. I don't know if it also occurs with module SqlOdbc. The problem is that when reading a table using this schema: VAR tab*: SqlDB.Table; r: INTEGER; row: SqlDB.Row; .. .. read from database into tab .. r := 0; tab.Read(r, row); WHILE tab.res # SqlDB...

I have discovered that instead of I can use