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Level 6

Message box with a return code

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I need to display a message box message box with a prompt for the user to press a "Yes" button or a "No" button.

Can someone show me how this is done in InstallShield? Also how do I get the value passed back when the message box is closed?

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(1) Solution

Try below

MessageBoxEx("Are you sure?","My message box header",MB_YESNO | MB_ICONEXCLAMATION );

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Level 7 Flexeran
Level 7 Flexeran

You can use InstallScript  AskYesNo method (returns value 1 when Yes button is clicked and 0 for No button).


You can also use InstallScript MessageBox method with appropriate styles supported by Windows MessageBox API for type field using logical OR operator (|).

For example, to show Yes and No buttons with warning icon, you could use corresponding constants defined in msdn documentation of MessageBox API( You can also check same link for return values.

MB_YESNO 0x00000004L

MessageBox("Test", 0x00000004 | 0x00000030);

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Thank you Varaprasad. I would have used the AskYesNo message box style, but there is not a parameter to set the title in the header?

I am now using MessageBoxEx to display the Yes No message box. It works great, but I can't figure out how to also place an Icon in the message box. Can you tell me how to do that? I notice that the AskYesNo message box has a question mark icon in it. I would like a warning icon in the MessageBoxEx if possible. Anyway that you know that I can do that?


Example: MessageBoxEx works great, how do I place an Icon in it?

if(MessageBoxEx("Are you sure?","My message box header",,MB_YESNO) = YES) then
// Do something


I tried AskYesNo, but can't set the header title:

if(AskYesNo("Are you sure?",YES) = YES) then
// Do Something

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Also I tried using SetDialogTitle before calling the message boxes, but it does not work, because I don't have the id of the message box? So that did not work.

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Try below

MessageBoxEx("Are you sure?","My message box header",MB_YESNO | MB_ICONEXCLAMATION );