Today on the analysis of the mp3 file structure, label size need to remove each byte highest, 28 to mix into the value, is the label size, can be in when conversion left 14 always prompt overflow, and left 21 to overflow, odd, supposedly numerical overflow, then numerical overflow to larger, can be left 21 and no more than four bytes highest boundary, is this why?

Dim x as long

X=(& amp; H34 And & amp; H7F) * & amp; H200000 sure

X=(& amp; H34 And & amp; H7F) * & amp; H4000 prompt overflow

X=(& amp; H34 And & amp; H7F) * & amp; H400 prompt overflow

X=(& amp; H34 And & amp; H7F) * & amp; H40 sure

X=(& amp; H34 And & amp; H7F) * & amp; H10000 sure

X=(& amp; H34 And & amp; H7F) * & amp; H20000 sure

X=(& amp; H34 And & amp; H7F) * & amp; H40000 sure

No try, who can tell me, left 21, and above all have no problem, how to shift to the left ten several overflow?