I have had a hard time getting and answer to this and i would really , really appreciate some help on this.
i have been on this for over 2 weeks without headway.
i want to use c# to add a line of stock data to amibroker but i just cant find a CLEAR response on how to instantiate it in C#.
In VB , I would do it something like;
Dim AmiBroker = CreateObject("Broker.Application")
sSymbol = ArrayRow(0).ToUpper
Stock = AmiBroker.Stocks.Add(sSymbol)
iDate = ArrayRow(1).ToLower
quote = Stock.Quotations.Add(iDate)
quote.Open = CSng(ArrayRow(2))
quote.High = CSng(ArrayRow(3))
quote.Low = CSng(ArrayRow(4))
quote.Close = CSng(ArrayRow(5))
quote.Volume = CLng(ArrayRow(6))
The problem is that CreateObject will not work in C# in this instance.
I found the code below somewhere online but i cant seem to understand how to achieve the above.
Type objClassType;
objClassType = Type.GetTypeFromProgID("Broker.Application");
// Instantiate AmiBroker
objApp = Activator.CreateInstance(objClassType);
objStocks = objApp.GetType().InvokeMember("Stocks", BindingFlags.GetProperty,null, objApp, null);
Can anyone help me here?
Thanks
The VB code uses something called late binding against a "COM IDispatch" compatible component. Late binding is not supported by C# (up to C# version 3). The C# compiler only compiles code it knows how bind to (called early bind).
To do what you want to do, it would be easier to generate a proxy dll via Visual Studio - select add reference on a project, then select the tab COM, and then search for that ami broker component in the list. This will generate a proxy dll which you can program against using similar code as the one you have showed for VB.
In C# 3.0, you'll discover that you sometimes have to use Type.Missing and that you have to do some additional explicit casting, even though you'd think that it doesn't seem logical.
C# 4.0 has something called dynamic, which allows you to write much cleaner code when accessing COM components.
See my answer here for the code:
https://stackoverflow.com/a/20101274/1581495
I actually use this method now. I save text files from MetaTrader then import them realtime into AmiBroker. Doing it this way is essentially like importing quotes using the ASCII import, so you'll need to make sure that you prepare your import format file. For me, a line of sample data looks like this:
EURAUD,20170607,00:00:00.4885,1.50174,1.50231,1 //Symbol, Date, Time (HH:MM:SS.tttt), Bid, Ask, Volume
I use the default.format file, which looks like this:
$FORMAT TICKER,DATE_YMD,TIME,CLOSE,AUX1,VOLUME
$SEPARATOR ,
$AUTOADD 0
$BREAKONERR 0
$SKIPLINES 0
Find the guide and some examples here on importing and formats:
https://www.amibroker.com/guide/d_ascii.html
EDIT: this might also help with importing
http://www.amibroker.com/kb/2016/01/23/how-to-create-custom-import-definition-for-ascii-importer/
Related
I'm familiar with how to group a range in Excel VSTO/COM interop:
ws.EnableOutlining = true;
ws.Outline.SummaryRow = XlSummaryRow.xlSummaryAbove;
var rng = GetRangeSomeHow();
rng.EntireRow.Group();
rng.EntireRow.OutlineLevel = someLevel;
What is the most efficient way to do this in Excel-DNA? I would imagine there must be a C-API way to do it, encapsulated cleverly in Excel-DNA somehow, but for the life of me, I can't figure it out via online documentation (incl. Google).
There's a lot of posts using code similar to my sample above, but these are pretty expensive calls, especially since I need to do this ~5000 times overall (I have a really big data set).
EDIT:
So there seems to be this method call:
XlCall.Excel(XlCall.xlfGroup...)
The only problem is, I have no idea what the parameters are. It seems an ExcelReference should be passed in, but how is the .EntireRow resolved? Will the C API just handle it for me - in which case I just need to pass a new ExcelReference(1,100,1,1) and be done with it... or is there more to this?
Thanks in advance to anyone who can answer my question!
I don't think the C API GROUP function is te one you're looking for. The documentation says:
GROUP
Creates a single object from several selected objects and returns the
object identifier of the group (for example, "Group 5"). Use GROUP to
combine a number of objects so that you can move or resize them
together.
If no object is selected, only one object is selected, or a group is
already selected, GROUP returns the #VALUE! error value and interrupts
the macro.
I'd suggest you use the COM object model for this kind of thing, even in an Excel-DNA add-in. The C API has not really been updated over the years for the general sheet manipulation like this case, so you're likely to run into some features that don't work right or are incomplete relative to the COM object model.
From your Excel-DNA add-in, just make sure your get hold of the right Application root object with a call to ExcelDnaUtil.Application.
For improved performance of this kind of sheet editing, you pretty much have to use the same tricks as from VBA or VSTO - disable screen updating and calculations etc.
I've been asked to re-add an extra check to our pre-commit hook to ensure svn:keywords are set on certain paths in our repos (e.g. scripts that need the Revision and URL values injecting). We had a clunky pre-commit hook written in C# using SharpSvn doing this originally, but we've migrated our SVN server to Linux, so I rewrote the hook in Python. It has most of the functionality, but I missed out the keyword checking.
In C#, the code used is like so:
SvnPropertyCollection propCollection;
svnLookClient.GetPropertyList(svnHookArgs.LookOrigin, item.Path, out propCollection);
....
if (item.Path.Contains("some path") && !propCollection.Contains("svn:keywords"))
{ /*Fail the commit here*/ }
I've found out the hard way that the transaction properties do not contain svn:keywords, even when I make a commit where all I have done is set them; calling svn.fs.svn_fs_txn_proplist on the transaction gives me the following properties:
svn:log
svn:txn-client-compat-version
svn:txn-user-agent
svn:author
svn:date
My Python code looks like this:
def check_keywords_are_set(transaction, repos_name):
commit_has_source_files = False
source_extensions = ('.sql', '.hlr') #Only care about source files
transaction_root = svn.fs.svn_fs_txn_root(transaction)
changed_paths = svn.fs.paths_changed(transaction_root)
for path, change in changed_paths.iteritems():
if repos_name == 'repo1' or (repos_name == 'repo2' and ('some path' in path): #These are the paths I want to enforce keywords being set on
if path.endswith(source_extensions):
commit_has_source_files = True
if not commit_has_source_files:
return True
#debugging code here:
transaction_props = svn.fs.svn_fs_txn_proplist(transaction)
sys.stdout.write('Transaction prop list:\n{0}\n'.format(transaction_props))
#end debugging
keywords = svn.fs.svn_fs_txn_prop(transaction, 'svn:keywords')
#keywords is always None
Looking back at the C# code, I can see references to svnlook, so I guess I'll have to use this. However, I'm getting confused between 'revision properties' and all other 'properties'. I'm also not sure how to write this so that if a developer is adding the missing keywords to files within a folder that should have them, or we're creating a new folder where this will later be enforced, it won't throw a false negative. The documentation for doing this in Python is quite poor and generally requires reading the C API source, which unfortunately I cannot get my head around (I am not a C developer), let alone translate into Python. Any assistance would be greatly appreciated.
I'm using Unity with C#. Creating a resource management game.
I need an Index system. ie. Food Happiness index, Food Variety idex.
Each index would have different formulas.
I don't want to hardcode each indexes.
I'm looking for parsing solutions that would allow me to store the formulas as string in JSON. And evaluate these formulas during runtime.
foodhapiness = (resourceDic["food"].Production/esourceDic["food"].Consumption) * foodVariety;
foodVariety = resourceDic["fish"].count/resourceDic["meat"].count;
Also, I'm thinking of letting user add their own indexes as well. - Create text file(json) with formulas and the game should load the text file and evaluate. Like a mod.
I tried using several Expression Evaluator solutions which would have been the solution but they appear to not be working with Unity.
FLEE : Error at compile. FileNotFoundException: Could not load file or assembly 'Microsoft.VisualBasic, Version=8.0.0.0, Culture=neutral,
C# Expression Evaluator : Won't compile. This one Unity says something like can't load library bundle.
In Javascript, there's an Eval() function. But someone pointed out that it's risky since this allow user to run any function also I need C# solution.
It feels like I'm coming at this in the wrong way. Anyone have a better solution for something like this ?
Used NLua. It works.
https://github.com/Mervill/Unity3D-NLua
-execute Lua script stored in a string to accessing C# Properties
Don't know about the performance though.
Leave this here if anyone google and ... keywords happen to match topic name which is unlikely.. anyway.
I'm starting with C# again after 3 years (have average experience with object orientated languages; here I'm mainly missing function names). I'm not too sure it's possible in c#, so if you can recommend another language I will try to look there.
My Question(s):
On program start (or button) I want to extract a part of a Website and save it (temporary of file don't matter). That way I wont need to buffer/load (loadtime) anything again and can access the content if I go offline afterward.
I want to extract some numbers out of the content and do simple math with them.
Would be great to know if its possible and how. I'm happy if you can tell me the main functions I should look into. Some basic code would be great too if its not too much to ask.
If you want to have access to the information even if your program closes/restarts then you will need to export the source code to a file as follows:
using (WebClient wb = new WebClient())
{
string source = wb.DownloadString("http://example.com");
File.WriteAllText("c:\\exampleFile.txt", source);
}
Otherwise you can remove the File.WriteAllText("c:\\exampleFile.txt", source); and simply parse the parts you want from the source and do your calculations.
Keep in mind this will download the source code of the url as 'it is' that means you will need to do some parsing of the text in order to get the information you want out of it.
May be you are looking for this:
var contents = new System.Net.WebClient().DownloadString(url);
I'm porting an Excel add-in from visual VB to Delphi 2006. Most of it is working but I am stuck on these two VB lines:
oXL.Selection.QueryTable
oXL.Selection <> ""
where oXL is defined as Excel.Application.
In Delphi ExcelApplication.Selection requires an index but in VB it doesn't. I couldn't find anything similar in C# either. I have tried ExcelApplication.ActiveCell which works as long as there is an existing query, otherwise Excel crashes.
Does anyone know what this translates into for Delphi, or C#?
Also if oXL.Selection is an interface, how can you perform oXL.Selection <> ""?
Thank you.
When automating Excel from Delphi using interfaces, a lot of methods take a LCID. You can use LOCALE_USER_DEFAULT for that.
var
oxlSelection: ExcelRange;
ExcelApplication.ActiveCell.QueryTable;
if Supports(fExcelApplication.Selection[LOCALE_USER_DEFAULT], ExcelRange, oxlSelection)
and (VarToStr(oxlSelection.Text) <> '') then
begin
//do something
end;
No worries, I had forgotten that you can just cast the application IDispatch interface to an OleVariant and then call the method.
But what I've done instead is just the following
try
ExcelApplication.ActiveCell.QueryTable.Refresh(False);
except
end;
This seems to be the only way to make it work without crashing excel.
I've run across this problem a lot of times, the solution is very simple.
Always use 0 for the localeID and everything will work as excepted.
This will make Excel fill in its default locale.
ExcelApplication.ActiveCell.QueryTable;
if OleVariant(ExcelApplication.Selection[0]).Value <> '' then .....
You can use variants and then you don't suffer this requirement, but in that case:
your code will run slower (all that variant magic takes time)
you will not have context help on your ExcelApplication methods and properties.
Note that selection, like cells returns a IDispatch, that you have to cast to a Olevariant, in order to work with it.
The same annoying thing happens in VBA, except there the cast is implicit.