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: C#
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 [...]
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.
Making sure a number is between 0 and 255
Tuesday, July 10th, 2007
Recently while reworking the code for the Ascgen dotNET I needed to make sure that a variable is between 0 and 255 before converting it to a byte, and I needed it to be as fast as possible since it can get called several million times a second.