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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Category Archives: Programming
Image.Clone does not unlock the file
Thursday, February 5th, 2009
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 in memory using Image copy = new Image(source).
Automatically Fill a ComboBox with an Enum
Monday, January 26th, 2009
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 = Enum.GetValues(typeof(MyEnumerator));
This fills the combobox with the values. To convert the current combobox value back into the enumerator’s value:
MyEnumerator [...]
Things I can’t code without in Visual Studio
Sunday, January 11th, 2009
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 was called.
Microsoft StyleCop: http://code.msdn.microsoft.com/sourceanalysis
This is the source analysis tool from and used by Microsoft programmers, [...]
The DirectSound Capture Buffer
Friday, January 9th, 2009
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.
An Explanation of Output Buffers in DirectSound
Tuesday, January 6th, 2009
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 so on.1
Each byte is a part of a sample, and a sample represents the average [...]
Getting the next n birthdays from a table in SQL
Sunday, October 26th, 2008
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`) = MONTH(NOW()) && DAY(`dob`) < DAY(NOW())),
MONTH(`dob`) + 12, MONTH(`dob`)) AS `adjusted_month`
FROM `person`
ORDER BY `adjusted_month`, DAY(`dob`), `name`
An alias called adjusted_month is used.
If the month of birth is earlier then [...]
Number of Selected Items in a Multiple Select Box with jQuery
Saturday, October 25th, 2008
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
TextRenderer is slow, DrawString is wrong
Thursday, August 30th, 2007
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 is also monumentally slow at rendering text.
Dragging and dropping onto a RichTextBox
Tuesday, July 24th, 2007
One of many flaws with the RichTextBox control is its lack of support for drag/drop operations. Luckily it’s simple to add. In fact, it’s so simple you’ll wonder why they didn’t just support it out of the box.