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Datamatrix二维码库和测试程序,运行于linux,仔细研究可以很容易转化成VC程序,有这就没必要化钱买个控件了,本人libdmtx-0.3版本转化过,的确可行,现在把找到该版本的libdmtx

This test program uses OpenGL (Mesa) to simulate camera input,
and writes decoded Data Matrix streams to STDOUT.

Right-click on the window to cycle through the test images.  To
add your own images for testing, just overwrite any image in the
libdmtx/test/test_images directory with another 256x256 PNG file.
If you want to add brand new images then you will have to update
the gFilename[] and gFileCount variables at the top of gltest.c
to include them.