I am developing a billing system using PowerBuilder 12.5 Classic and I need to set 0 for a textbox; like in vb.net txtchange.Text = 0
i have two drop down list boxes
ddlb_price (defines the price value of an item)
ddlb_cash (the cash amount given by the customer)
sle_change (the change that the cashier is to give the customer)
the system should set the value for sle_change when the cashier inputs the cash.
1. this gives me syntax error;
if cash=price then
sle_fare.settext=0
end if
2. this gives 'incompatible types in assinment
if cash=price then
sle_fare.text=0
end if
The single line edit (sle) control is designed to hold text. You're trying to assign it a numeric value. You will have to change the number into a string if you want the sle to display it:
sle_fare.text = "0"
or
sle_fare.text = string(variableHere)
Once again, I'm going to step back, ignore the actual questions, and look at how a DataWindow would help as an alternative.
You seem to want a control with a data type behind it. The DataWindow has those types of controls. Don't forget that a DataWindow doesn't have to have a SELECT statement behind it; it can have a stored procedure, web service, or nothing at all (external DataWindow) behind the data set. Once you have a control with a numeric data type behind it, you get (for free) some basic editing controls, such as not allowing alpha characters in the field and making sure the entered value is really a number (e.g. "0-.2.1" would fail).
A step beyond that is looking at one of your coming requirements: calculating change. On a DataWindow, you can create a compute with an expression that will automagically calculate your change for you, once price and cash are entered.
I certainly don't want to say you can't do things the way you're proceeding, but there are many issues that a DataWindow would remove over some other approach. The strength of PowerBuilder is in the DataWindow.
Good luck,
Terry
Related
I am verifying a very small model. But I receive the memory exhaust message. I changed the model several times but having same problem.
I thought that problem would be due to using a user defined function or using the select option to get the random number. Then I changed the model and didn't call the function nor used the Selection option but still....
I am wondering either it's UPPAAL's issue or in my model. There is no error other than memory exhaust. Once the value of "r1" and "r2" are changed after that ctl property doesn't work.
CTL works for all values of r1 and r2 before the increment.
The model increments several variables (r1, r2 and cntr): if there is no upper bound for them (and it seems there is not, but I cannot see all the functions), then the state space is going to be huge (all values multiplied times the number of locations, times clock zones) and thus exhaust all the memory.
Either make those variables bounded (do not allow increments passed some value), or declare them as meta (don't do it if you do not understand the consequences).
Apologies, in trying to be concise and clear my previous description of my question turned into a special case of the general case I'm trying to solve.
New Description
I'm trying to Compare the last emitted value of an Aggregation Function (Let's say Sum()) with a each element that I aggregate over in the current window.
Worth noting, that the ideal (I think) solution would include
The T2(from t-1) element used at time = t is the one that was created during the previous window.
I've been playing with several ideas/experiments but I'm struggling to find a way to accomplish this in a way is elegant and "empathetic" to Beam's compute model (which I'm still trying to fully Grock after many an article/blog/doc and book :)
Side inputs seem unwieldy because It looks like I have to shift the emitted 5M#T-1 Aggregation's timestamp into the 5M#T's window in order to align it with the current 5M window
In attempting this with side inputs (as I understand them), I ended up with some nasty code that was quite "circularly referential", but not in an elegant recursive way :)
Any help in the right direction would be much appreciated.
Edit:
Modified diagram and improved description to more clearly show:
the intent of using emitted T2(from t-1) to calculate T2 at t
that the desired T2(from t-1) used to calculate T2 is the one with the correct key
Instead of modifying the timestamp of records that are materialized so that they appear in the current window, you should supply a window mapping fn which just maps the current window on to the past one.
You'll want to create a custom WindowFn which implements the window mapping behavior that you want paying special attention to overriding the getDefaultWindowMappingFn function.
Your pipeline would be like:
PCollection<T> mySource = /* data */
PCollectionView<SumT> view = mySource
.apply(Window.into(myCustomWindowFnWithNewWindowMappingFn))
.apply(Combine.globally(myCombiner).asSingletonView());
mySource.apply(ParDo.of(/* DoFn that consumes side input */).withSideInputs(view));
Pay special attention to the default value the combiner will produce since this will be the default value when the view has had no data emitted to it.
Also, the easiest way to write your own custom window function is to copy an existing one.
I want to offer the user the choice of imperial or metric measurement of weight in my app to increase audience suitability. I have designed the following below to allow me to determine which setting the user wishes to use.
However, im unsure how I would go about applying the metric selection to the whole rest of the app? Would it be a case of setting the app reach into each object the user has created in coredata and all text labels relating to a weight measurement and alter their weight property by multiplication or division each time the user changes weight system?
Appreciate any insight into how I may achieve this as I didnt want to go too far in the wrong direction!
func convertAppMetric() {
if self.userSelectedWeightSystem == "Metric" {
print("THE USER SET THE APP TO METRIC, CONVERTING FIGURES...")
//some code
} else if self.userSelectedWeightSystem == "Imperial" {
print("THE USER SET THE APP TO IMPERIAL, CONVERTING FIGURES...")
//some other code
}
}
This is going to be one of those answers that SO hates, but you want to go read up on NSMeasurement.
NSMeasurement holds both a value and a Unit, the later of which is the original measurement type. You store all your data in the format that was originally provided - if the user puts in pounds, store a NSMeasurement with 182 pounds. If they put in kg, make one with 90 kg. You can even put in your own Units, like stone.
From then on, always present the data using an NSMeasurementFormatter. You can pass in the output type, which in your case is the global setting you mentioned in your question. This means that no matter what unit they provided, it always comes out properly converted to the one you want, and changing it instantly changes it everywhere.
Its easy to make your own converters for weird units. I made one for decimal inches and feet/inches, so 13.5 inches turns into 1' 1.5".
Is there a way to display response options that have 0 responses in SPSS frequency output? The default is for SPSS to omit in the frequency table output any response option that is not selected by at least a single respondent. I looked for a syntax-driven option to no avail. Thank you in advance for any assistance!
It doesn't show because there is no one single case in the data is with that attribute. So, by forcing a row of zero you'll need to realize we're asking SPSS to do something incorrect.
Having said that, you can introduce a fake case with the missing category. E.g. if you have Orange, Apple, and Pear, but no one answered they like Pear, the add one fake case that says Pear.
Now, make a new weight variable that consists of only 1. But for the Pear case, make it very very small like 0.00001. Then, go to Data > Weight Cases > Weight cases by and put that new weight variable over. Click OK to apply. Now what happens is that SPSS will treat the "1" with a weight of 1 and the fake case with a weight that is 1/10000 of a normal case. If you rerun the frequency you should see the one with zero count shows up.
If you have purchased the Custom Table module you can also do that directly as well, as far as I can tell from their technical document. That module costs 637 to 3630 depending on license type, so probably only worth a try if your institute has it.
So, I'm a noob with SPSS, I (shame on me) have a cracked version of SPSS 22 and if I understood your question correctly, this is my solution:
double click the Frequency table in Output
right click table, select Table Properties
go to General and then uncheck the Hide empty rows and columns option
Hope this helps someone!
If your SPSS version has no Custom Tables installed and you haven't collected money for that module yet then use the following (run this syntax):
*Note: please use variable names up to 8 characters long.
set mxloops 1000. /*in case your list of values is longer than 40
matrix.
get vars /vari= V1 V2 /names= names /miss= omit. /*V1 V2 here is your categorical variable(s)
comp vals= {1,2,3,4,5,99}. /*let this be the list of possible values shared by the variables
comp freq= make(ncol(vals),ncol(vars),0).
loop i= 1 to ncol(vals).
comp freq(i,:)= csum(vars=vals(i)).
end loop.
comp names= {'vals',names}.
print {t(vals),freq} /cnames= names /title 'Frequency'. /*here you are - the frequencies
print {t(vals),freq/nrow(vars)*100} /cnames= names /format f8.2 /title 'Percent'. /*and percents
end matrix.
*If variables have missing values, they are deleted listwise. To include missings, use
get vars /vari= V1 V2 /names= names /miss= -999. /*or other value
*To exclude missings individually from each variable, analyze by separate variables.
We have an application that prints 2 invoice copies - 1 on white (for the cust) and 1 on blue (for us).
We print a LOT of these so we are getting a printer with 3 big trays. One tray (tray 5) holds 4000 sheets and the other two (trays 3 and 4) are a tandem set holding 1600 and 2000 sheets. The application automatically generates the invoice and sends one document to the tray with the white paper and one to the tray with the blue paper.
The user has no input in this process.
Now, my problem is this - if I specifically send the blue copy to tray 3 and there is no paper in tray 3, the job will go on hold until someone loads it up even though tray 4 has 2000 more sheets ready to go. On the other hand, if I tell the printer to print on Blue 8 1/2x11" paper, it is smart enough to know that that type of paper is in both trays and to pull from either one until they are both empty. So, I want to change our application to select a paper type/size and color instead of a specific tray.
The program is written in Delphi and I have been looking at the DEVMODE structure returned by TPrinter.GetPrinter. The DEVMODE structure has a memory size in dmDriverExtra that indicates how much extra data the print driver is adding to the structure for its own storage.
Does anyone know of anyway to access this data and make changes to it? If you have examples in other languages, I can probably adapt it to Delphi so anything will help.
There are actually two different items in the questions:
How to set the pater size and type:
PaperSize would be stored in dmPaperSize (value DMPAPER_LETTER)
PaperType is a bit more difficult. I'd guess that it's in dmMediaType (use DeviceCapabilities to retrieve available media types and their names)
How to access / edit "DriverExtra" data:
In short: don't!
A bit longer: dmDriverExtra is described as "Contains the number of bytes of private driver-data that follow this structure". So this data is private to the driver (which means that you need very good documentation for the driver to actually know the format and content of this data. It's not guaranteed that different versions of the driver use the same format).
So the only thing you can do is to use a print dialog, retrieve the DevMode structure and store it for further use (however as I said: If the driver changes, this data may become invalid...)