LDialogFile::DoModalSave crashes app

Jeremy,
Does this also happen if you compile our demos or only in your own code? Also, can you try to test your application after you download the latest SDK patches?
To get the latest patches, please send your toolkit serial number to support@leadtools.com and mention this post.

Hi Adnan,

Thanks for replying. I have not tried your demos recently, but I don't think I had any problems when I tried them before, so I am guessing that it's just in our code. I have a small application that one of our new team members put together as a training exercise, and the SaveFileDlg works just fine!! I have ported this code more-or-less as-is to our applications and it appears to have solved the problem in one case, but in the second case identical code is still causing a crash when I try to change the file type for saving. If I run a release build of this from VS2005 the crash is consitently occurring in the last case statment in the mfc CFileDialog::OnNotify() function.

We updated our SDK towards the end of last year I think, but could you inform me as to what version of the libraries you are currently on, and I can check what we are using at this end.

regards

Jeremy

Ok, some more information for you.

We limit the number of available save file formats using the code supplied in the help files:

        // Limit the filter to bitmap, gif, cmp and jpg
        FILESAVEFORMAT fsf[5];
        fsf[0].nFormat = DLG_FF_SAVE_JPEG;
        fsf[0].uStructSize = sizeof(FILESAVEFORMAT);
        fsf[1].nFormat = DLG_FF_SAVE_PNG;
        fsf[1].uStructSize = sizeof(FILESAVEFORMAT);
        fsf[2].nFormat = DLG_FF_SAVE_TIFF;
        fsf[2].uStructSize = sizeof(FILESAVEFORMAT);
        fsf[3].nFormat = DLG_FF_SAVE_BMP;
        fsf[3].uStructSize = sizeof(FILESAVEFORMAT);
        fsf[4].nFormat = DLG_FF_SAVE_PCX;
        fsf[4].uStructSize = sizeof(FILESAVEFORMAT);
        DlgParams.uFileFormatsCount = 5;

If I have the code like this, the SaveFileDlg will display correctly, but will crash the app if I try to select BMP or PCX formats. If I remove these formats like this:

        // Limit the filter to bitmap, gif, cmp and jpg
        FILESAVEFORMAT fsf[3];
        fsf[0].nFormat = DLG_FF_SAVE_JPEG;
        fsf[0].uStructSize = sizeof(FILESAVEFORMAT);
        fsf[1].nFormat = DLG_FF_SAVE_PNG;
        fsf[1].uStructSize = sizeof(FILESAVEFORMAT);
        fsf[2].nFormat = DLG_FF_SAVE_TIFF;
        fsf[2].uStructSize = sizeof(FILESAVEFORMAT);
        //fsf[3].nFormat = DLG_FF_SAVE_BMP;
        //fsf[3].uStructSize = sizeof(FILESAVEFORMAT);
        //fsf[4].nFormat = DLG_FF_SAVE_PCX;
        //fsf[4].uStructSize = sizeof(FILESAVEFORMAT);
        DlgParams.uFileFormatsCount = 3;

The application will crash as soon as it tries to display the dialog. Of course, none of this happens in debug builds and the applications run perfectly!!

Jeremy

Progress....if I don't limit the file formats at all, both of the applications work just fine. Am I setting up the DlgParams incorrectly or something?

For each format, you should also define this:
fsf[N].nBppCount = 1; //or more
fsf[N].pFileSaveFormatBpp = <array of FILESAVEFORMATBPP structures>;

If you do that does the crash stop?

So, are you saying that for each format I want to show up in the dialog, I MUST define a Sub-formats array, as defined on your help page?

(http://www.leadtools.com/help/leadtools/v14/CommonDlgApi/Dllaux/CustomizingFileFormatLists.htm)

It's the end of the working day here, so I'll have to try this out tomorrow. Thanks for your help so far, I'll let you know how I get on.

Jeremy

Jeremy,

Yes, even
if there is only one value for bits per pixel, such as 24, you should define an array of FILESAVEFORMATBPP structures (one element or more) and pass it.

If you
have 6 file formats in the dialog, you need to define 6 arrays. Each array will contain one or more elements (each element is a structure).

So, something like this?

        // Set up the file format subformat arrays
        FILESAVEFORMATBPP jpgFSFBPP[1];
        jpgFSFBPP[0].nFormatBpp = DLG_FF_SAVE_SUB_JPEG24_YUV_444;
        jpgFSFBPP[0].uStructSize = sizeof(FILESAVEFORMATBPP);

        // Limit the filter to bitmap, gif, cmp and jpg
        FILESAVEFORMAT fsf[5];
        fsf[0].nFormat = DLG_FF_SAVE_JPEG;
        fsf[0].uStructSize = sizeof(FILESAVEFORMAT);
        fsf[0].nBppCount = 1;
        fsf[0].pFileSaveFormatBpp = jpgFSFBPP;
       ...................

What about formats like PNG which have no subformats?

thanks

Jeremy

No, I'm still doing something wrong...is there an example somewhere for setting up these FILESAVEFORMATBPP structs? This really isn't particularly well documented!!

 The nFormatBpp member should be set to a value such as 24 or 8 (bits per pixel).
The
subtype, such as DLG_FF_SAVE_SUB_JPEG24_YUV_444, goes into the uSubFormats member.
About formats that don't have subtypes, pass 0 in the uSubFormats member.

Adnan,

That's great!! Looks like it's working now....I'll be back if it isn't ;-)

Thanks for all your help.

Jeremy