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8.6

Rotate and Resize a Picture on any Windows OS

Asked by mdougan in Visual Basic Programming, Windows 2000 Operating System, Windows XP Operating System

Tags: VB 6, Picture Resize and Rotation, rotate, picture, resize, windows, any

I have a program written in VB6. I'm adding a form where the user will manipulate the picture in a picture box control. Sometimes, the program draws a picture in the picture box, sometimes the user will elect to load a BMP, JPG or GIF into the picturebox.

When the image is drawn or loaded into the picture box, it is automatically sized to fit the widest dimension (width or height).

Then, the user can manipulate a slider that rotates the picture in the picture box by any increment of degrees.

I'd hacked together a clsBitmap I'd found online, with some other code to do the rotation and I'd gotten this function working under Windows 2000, but found that it did not work under Windows XP. I also see that I've used one Windows API that is not available under Windows 95. I believe that Microsoft changed the signature of some basic Windows API functions, and/or redefined types such as BITMAPBASEINFO which is used by several of the API calls.

I'd like to be able to use this function on any OS, without having to jump through hoops checking what version of the OS is being used, and using different API declarations accordingly. I would consider this option, though, as a last resort.

My needs are pretty simple in nature (though maybe not in implementation)... I need to be able to take a standard Picture object, reference it's height and width in pixels, resize it and rotate it, under any version of Windows.

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Rotate and Resize a Picture on any Windows OS

Asked by mdougan in Visual Basic Programming, Windows 2000 Operating System, Windows XP Operating System

Tags: VB 6, Picture Resize and Rotation, rotate, picture, resize, windows, any

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