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Dialog box halting program

This is a discussion on Dialog box halting program within the Windows Programming forums, part of the Platform Specific Boards category; Hi everyone, I have some code which downloads an image from the internet when a button IDC_DOWNLOAD is pressed in ...

  1. #1
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    Dialog box halting program

    Hi everyone,

    I have some code which downloads an image from the internet when a button IDC_DOWNLOAD is pressed in a Win32 program:

    Code:
    case IDC_DOWNLOAD:
    	DialogBox(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_LOADING), hwnd, ToolDlgProc);
    	URLDownloadToFile( NULL, "http://website.com/image.jpg", "image.bmp", 0, NULL );
            ShellExecute(NULL, "open", "image.bmp", NULL, NULL, SW_SHOWNORMAL);					
    break;
    It works fine and downloads and displays the image when I get rid of the DialogBox line, but for some reason when I put the DialogBox part in, it just opens the dialog box and doesn't download the image. Is there a way to load a dialog box and also continue to download and display the image?

    Thanks.

  2. #2
    and the Hat of Guessing tabstop's Avatar
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    From MSDN:
    DialogBox does not return control until the specified callback function terminates the modal dialog box by calling the EndDialog function.
    If that's not what you want, then don't use DialogBox.

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    Thanks - what are the alternatives?

  4. #4
    and the Hat of Guessing tabstop's Avatar
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    Opening up any other type of window? (e.g. with CreateWindow)
    george7378 likes this.

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    Quote Originally Posted by george7378 View Post
    Thanks - what are the alternatives?
    Look up CreateDialog() ...
    george7378 likes this.

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    Thanks for the tips. I had a look at CreateDialog(), and I put it into the code. It compiles OK, but when I press the button, the dialog box doesn't appear (the image downloads and opens OK, but the box doesn't work). Is there anything else I need to add in apart from changing 'DialogBox' for 'CreateDialog'?

    Thanks.

  7. #7
    C++まいる!Cをこわせ!
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    Not having looked at MSDN, perhaps ShowWindow?
    george7378 likes this.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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    Quote Originally Posted by Elysia View Post
    Not having looked at MSDN, perhaps ShowWindow?
    Yep, that sorted it. Thanks for all your help guys!

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    Quote Originally Posted by george7378 View Post
    Thanks for the tips. I had a look at CreateDialog(), and I put it into the code. It compiles OK, but when I press the button, the dialog box doesn't appear (the image downloads and opens OK, but the box doesn't work). Is there anything else I need to add in apart from changing 'DialogBox' for 'CreateDialog'?

    Thanks.
    Sigh... read the requirements... CreateDialog Function (Windows)

    See the lpTemplate parameter in there... That is for a dialog box template stored in your program's resources.

    Read this... theForger's Win32 API Tutorial for a tutorial on the proper construction of Windows GUI mode programs.

  10. #10
    C++まいる!Cをこわせ!
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    You might want to use a GUI library for your GUI programming. Which ones exist depend on which language you're using.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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