Windows apps verses Console apps

This is a discussion on Windows apps verses Console apps within the Windows Programming forums, part of the Platform Specific Boards category; With console apps I can use cin and cout, but then in windows apps (using bloodshed dev c++ 's windows ...

  1. #1
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    Windows apps verses Console apps

    With console apps I can use cin and cout, but then in windows apps (using bloodshed dev c++ 's windows template) If I try and use cin or cout I get nothing. I assume this has something to do with redirecting the standard input and output streams. So I have a few questions about this,

    1) For the windows app where is the standard input and output stream redirected as default?

    2) How can I redirect the standard inout and output streams to a console if one does not exist in a windows app?

  2. #2
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    cin and cout go to the console. A windows application doesn't HAVE a console by default.

    You could create a console, but if you want the output to appear IN YOUR window, that's not what you want to do - you'll essentially have to do it "some other way".

    If you want to use cin/cout for debug purposes, then you can use AllocConsole:
    http://msdn2.microsoft.com/en-us/library/ms681944.aspx

    AllocConsole will do everything you need for cin/cout to work - just make sure you call AllocConsole first and enjoy.

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    Well I inserted a call to AllocConsole and it made a console window show up, but I cannot write to it or get input from it. It the documentation it says it initializes standard input and standard output. I am a little lost as to why this is not working then.

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    That's strange - perhaps the cin/cout aren't set up correctly (or failed to initiailize to their respective file handles as they weren't valid at that point, perhaps).

    I'll have a look to see if I can figure out what needs to be done.

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  5. #5
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    Seems like it's a bit more to it: I think this page describes what you need to do
    http://www.codeproject.com/cpp/EditBin.asp

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  6. #6
    Registered User Codeplug's Avatar
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    You can use AllocConsole(), you just have to do a little work to "hook up" your CRT's implementation to that console. I believe mingw in DevC++ still uses the Microsoft CRT - in which case here's some information on "hook up" code for the MS CRT:

    http://www.halcyon.com/~ast/dload/guicon.htm

    But it's also easy to just change your subsystem at compile time (or by using editbin).

    gg

  7. #7
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    Codeplug, That's roughly what the link I posted does, just not all the
    Code:
    std{in,out,err} FILE's
    .

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    Mats
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  8. #8
    Registered User Codeplug's Avatar
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    The point of the editbin article is that you can't change the subsystem of an MFC application. If you're not using MFC, there's nothing stopping you from writing windows GUI code within a console application (using DevC++'s console app template for instance). The downside is that you'll always have a console window that pops up when you start your application.

    If you would like to create a console window at runtime, then you'll need to "hook up" the allocated console as described. The advantage here is that you can create the console when/if you want it.

    More information on creating a console at runtime:
    http://www.codeproject.com/useritems/ConsoleAdapter.asp

    gg

  9. #9
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    AllocConsole is just the start.

    try taking a look at the left menu when you're looking at the AllocConsole entry at msdn.

    you can use ReadConsole and WriteConsole to read and write with a console. hell, you can even use ReadFile and WriteFile to read and write with a console. you can use GetStdHandle and SetStdHandle to redirect I/O to handles of your choice (pipes, files, even sockets, you're dealing with void *).

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