As seen in the following recipe, the |= operator is used. I’ve never seen it before, and it’s not documented. What does it mean?
As seen in the following recipe , the |= operator is used. I’ve never
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As seen in the following recipe, the |= operator is used. I’ve never seen it before, and it’s not documented. What does it mean?
In the particular recipe you’re asking about:
dwFlagsis a bitmask, that is, it stores a number of flags in a single integer value by turning on the appropriate bits in the integer. In this case,STARTF_USESHOWWINDOWhas a value of1, which means that this flag is set if the least significant bit in thedwFlagsinteger is1, and is not set if the LSB is0.What the
|=operator does in this case is to take the left operand and change it so the1bits in the left operand are set in it, and the rest of the bits are left alone.For example, if it has some flags set such that it’s binary representation before was, say,
00101000, it will be set to00101001, addingsubprocess.STARTF_USESHOWWINDOWto the flags that are set without affecting the other flags that were set before the operation.