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  • "Invalid Column Name" error thrown by Access Reports?

    - by badpanda
    I am attempting to sum over a detail grouping on a specific field in Microsoft Access, and assign that sum to a field in the general grouping. When I try to run the report, I get an "Invalid Column Name" error with the detail field getting the error. Has anyone previously encountered this? If so, any ideas what might be causing it or how to solve it?

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  • C# xml Class to substitute ini files

    - by Eduardo
    Hi guys, I am learning Windows Forms in C#.NET 2008 and i want to build a class to work with SIMPLE xml files (config file like INI files), but i just need a simple class (open, getvalue, setvalue, creategroup, save and close functions), to substitute of ini files. I already did something and it is working but I am having trouble when I need to create different groups, something like this: <?xml version="1.0" encoding="utf-8"?> <CONFIG> <General> <Field1>192.168.0.2</Field1> </General> <Data> <Field1>Joseph</Field1> <Field2>Locked</Field2> </Data> </CONFIG> how can i specify that i want to read the field1 of [data] group? note that i have same field name in both groups (Field1)! I am using System.Linq, something like this: To open document: XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(FilePath); To save document: xmlDoc.Save(FilePath); To get value: public string getValue(string Field) { string result = ""; try { XmlNodeList xmlComum = xmlDoc.GetElementsByTagName(Field); if (xmlComum.Item(0) == null) result = ""; else result = xmlComum.Item(0).InnerText; } catch (Exception ex) { return ""; } return result; } To set value: public void setValue(string Group, string Field, string FieldValue) { try { XmlNodeList xmlComum = xmlDoc.GetElementsByTagName(Field); if (xmlComum.Item(0) == null) { xmlComum = xmlDoc.GetElementsByTagName(Group); if (xmlComum.Item(0) == null) { // create group createGroup(Group); xmlComum = xmlDoc.GetElementsByTagName(Group); } XmlElement xmlE = xmlDoc.CreateElement(Field); XmlText xmlT = xmlDoc.CreateTextNode(FieldValue); xmlE.AppendChild(xmlT); xmlComum.Item(0).AppendChild(xmlE); } else { // item already exists, just change its value xmlComum.Item(0).InnerText = Value; } xmlDoc.Save(FilePath); } catch (Exception ex) { } } The CreateGroup code: public void createGroup(string Group) { try { XmlElement xmlComum = xmlDoc.CreateElement(Group); xmlDoc.DocumentElement.AppendChild(xmlComum); xmlDoc.Save(FilePath); } catch (Exception ex) { } } Thank You!

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  • Exposing members or make them private in Python?

    - by deamon
    Is there a general convention about exposing members in Python classes? I know that this is a case of "it depends", but maybe there is a rule of thumb. Private member: class Node: def __init__(self): self.__childs = [] def add_childs(self, *args): self.__childs += args node = Node() node.add_childs("one", "two") Public member: class Node2: def __init__(self): self.childs = [] node2 = Node2() node2.childs += "one", "two"

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  • How to check WCF generated client is compatible with service at runtime

    - by Schneider
    I realise that WCF and services in general are meant to be loosely coupled. But I have a requirement that my client app can check whether an given WCF endpoint contains a service that matches its generated client code. In other words I need to check for a compatible service. Obviously I could have a method that returns a manually maintained version number, but I would prefer not to have to write my own meta data system if WCF can do something out of the box.

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  • C - How to implement Set data structure?

    - by psihodelia
    Is there any tricky way to implement a set data structure (a collection of unique values) in C? All elements in a set will be of the same type and there is a huge RAM memory. As I know, for integers it can be done really fast'N'easy using value-indexed arrays. But I'd like to have a very general Set data type. And it would be nice if a set could include itself.

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  • How to refactor this MySQL code?

    - by Jader Dias
    SELECT * ( SELECT * FROM `table1` WHERE `id` NOT IN ( SELECT `id` FROM `table2` WHERE `col4` = 5 ) group by `col2` having sum(`col3`) > 0 UNION SELECT * FROM `table1` WHERE `id` NOT IN ( SELECT `id` FROM `table2` WHERE `col4` = 5 ) group by `col2` having sum(`col3`) = 0 ) t1; For readability and performance reasons, I think this code could be refactored. But how?

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  • F# mutual recursion between modules

    - by rwallace
    For recursion in F#, existing documentation is clear about how to do it in the special case where it's just one function calling itself, or a group of physically adjacent functions calling each other. But in the general case where a group of functions in different modules need to call each other, how do you do it?

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  • File Operations in Android NDK

    - by EnderX
    I am using the Android NDK to make an application primarily in C for performance reasons, but it appears that file operations such as fopen do not work correctly in Android. Whenever I try to use these functions, the application crashes. How do I create/write to a file with the Android NDK?

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  • wsFederationHttpBinding over net.tcp

    - by CodeChef
    I have services that use net.tcp bindings (both streaming and buffered endpoints.) I'd like to add WIF federated security to those services, while continuing to use net.tcp bindings. I've tried to create custom bindings, but so far have been unsuccessful. Below is the general architecture that I'm attempting. I'm looking for the correct binding configuration to make this work. Client - WPF Application Relying party - WCF Service with net.tcp endpoints STS - WCF Service with http(s) endpoint

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  • OpenGL - GL_FRONT versus GL_FRONT_AND_BACK

    - by Drew Noakes
    I'm tinkering with an open source project that uses OpenGL for rendering in 3D. In the construction of the materials I see code like this: // set ambient material reflectance glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mAmbient); In other examples, this is used: glMaterialfv(GL_FRONT, GL_AMBIENT, mAmbient); So my question is, what is the difference here? Under what circumstances would it look different and, if my volume is enclosed with all normals pointing outwards, is there any performance difference?

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  • Updating an atom with a single value

    - by mikera
    I have a number of atoms in my code where a common requirement is to update them to a new value, regardless of the current value. I therefore find myself writing something like this: (swap! atom-name (fn [_] (identity new-value))) This works but seems pretty ugly and presumably incurs a performance penalty for constructing the anonymous closure. Is there a better way?

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  • Is there a common practice how to make freeing memory for Garbage Collector easier in .NET?

    - by MartyIX
    I've been thinking if there's a way how to speed up freeing memory in .NET. I'm creating a game in .NET (only managed code) where no significant graphics is needed but still I would like to write it properly in order to not to lose performance for nothing. For example is it useful to assign null value to objects that are not longer needed? I see this in a few samples over Internet. Thanks for answers!

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  • Does an XML schema or DTD exist for PerformancePoint's Xml Metadata?

    - by Athens
    I wrote several XQuery statements to shred existing KPI and Dashboard metadata but I would like to validate my queries by reviewing the corresponding Xml Schema or DTD if it exists. I searched online but could not find what i was looking for. The metadata is stored in Performance Point's back end Sql Server database in the dbo.FCObjects table's SerializedXml column.

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  • How to log sql statements in grails

    - by damian
    Hi I want to log in the console or in a file, all the queries that Grails do, to check performance. I had configured [this][1] without success. Any idea would help. [1]: http://www.grails.org/FAQ#Q: How can I turn on logging for hibernate in order to see SQL statements, input parameters and output results?

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  • Best options for image resizing

    - by Claudio Redi
    Hi, I have resize images exceeding a max size. Methods I tried so far are not good enough :-( System.Drawing.Image.GetThumbnailImage generates very poor quality images in general. Playing with options like this one I can generate better images in quality but heavier than the original one. Probably the second option (or something similar) is the best option and I would need to resize using the proper options. Any advice?

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