Author Archives: Jonathan

Setting the order of properties in an ExpandableObjectConverter

Posted on June 19, 2010 by Jonathan

When inheriting from an ExpandableObjectConverter to display custom properties in a PropertyGrid, you will often want to set the order of the properties instead of having them in alphabetical order. To do this you just need to override the GetProperties … Continue reading →

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C# Snippet for Accessing Bitmap Data with Unsafe Code

Posted on March 30, 2009 by Jonathan

Since GetPixel is slow and I keep having to access bitmap data with unsafe code, I thought it would be a nice thing to make into a snippet.

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Image.Clone does not unlock the file

Posted on February 5, 2009 by Jonathan

Turns out, copying an image using Clone really does make an exact copy. You can’t just open an image, clone it, then safely close it as you might expect, because it also copies the file lock. Instead, copy the image … Continue reading →

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Automatically Fill a ComboBox with an Enum

Posted on January 26, 2009 by Jonathan

This is a really nice little feature. If we have an enumerator, say: public enum MyEnumerator { Oranges, Apples, Hedgehogs, Laptops, Budgies, Other } Having a form with a ComboBox called comboBox1, put this in the constructor/form load etc: this.comboBox1.DataSource … Continue reading →

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Things I can’t code without in Visual Studio

Posted on January 11, 2009 by Jonathan

Here’s a quick list of essential plug-ins and tools for Visual Studio. All of them are free, and this is mainly so the next time I reinstall windows I won’t spend ages trying to remember what that thing I use … Continue reading →

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The DirectSound Capture Buffer

Posted on January 9, 2009 by Jonathan

A CaptureBuffer is a buffer of a specified length that reads audio from a Capture object which represents the capture (or input) device, into a one-dimensional array of bytes with a specified WaveFormat.

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An Explanation of Output Buffers in DirectSound

Posted on January 6, 2009 by Jonathan

A DirectSound Buffer is a one-dimensional array of bytes which represent sound waves in a digital form. The data is laid out in a specified Microsoft.DirectX.DirectSound.WaveFormat which specifies the format type, number of channels, number of samples per second and … Continue reading →

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Getting the next n birthdays from a table in SQL

Posted on October 26, 2008 by Jonathan

If we have a table with a basic structure like this: ———- person ———- person_id name dob … ———- Let’s run a query with the results sorted by order of upcoming birthdays: SELECT *, IF(MONTH(`dob`) < MONTH(NOW()) || (MONTH(`dob`) = … Continue reading →

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Number of Selected Items in a Multiple Select Box with jQuery

Posted on October 25, 2008 by Jonathan

With the html: <select name=”my_list” multiple=”multiple”> <option value=”one”>1</option> <option value=”two”>2</option> <option value=”three”>3</option> <option value=”four”>4</option> <option value=”five”>5</option> </select> One way to find the number of options selected: $(“select[name='my_list']>option:selected”).length

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TextRenderer is slow, DrawString is wrong

Posted on August 30, 2007 by Jonathan

After struggling with WinAPI code and hacks in .NET 1.0 I was really looking forward to the TextRenderer class when I first heard about it. But as it turns out, not only is TextRenderer horrible at measuring character size it … Continue reading →

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