I want to use "EnableMenuItem" to disable(grey) the CLOSE button on the top right corner of pkzip window. I tried "EnableMenuItem(lhMenu,6,MF_GRAYED And MF_BYPOSITION)", and nothing was disabled. In the command above, lhMenu is the menu handle,6 is position of CLOSE. Thanks for your help.
the usage of your api correct but instead of "and" in between MF_GRAYED and MF_BYPOSITION you should use "or".
You should use like this
EnableMenuItem(lhMenu,6,MF_GRAYED or MF_BYPOSITION)"
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