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Why does my Today Plugin sometimes disappear on Windows Mobile 2003 Second Edition devices?

April 26, 2017Devices disappear edition mobile plugin today Windows

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Why does my Today Plugin sometimes disappear on Windows Mobile 2003 Second Edition devices?

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The code for the sample Today Screen plugin that ships with the Pocket PC 2003 SDK does not behave as it should do. The code calls DefWindowProc after handling WM_PAINT, which it should not do. It should simply return zero after doing its painting. This bug can result in incorrect painting; specifically, you will get a WMERASEBACKGROUND without a subsequent WMPAINT, which will cause your plugin to disappear. If your Today Screen plugin was built based on the sample code you should correct this behavior to fix your problem.