listing files in dialog box

This is a discussion on listing files in dialog box within the Windows Programming forums, part of the Platform Specific Boards category; I'm using DlgDirListComboBox(), to try and get files listed in my dialogs combo box. this is the code for it, ...

  1. #1
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    Join Date
    Aug 2003
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    23

    listing files in dialog box

    I'm using DlgDirListComboBox(), to try and get files listed in my dialogs combo box.

    this is the code for it,

    Code:
    BOOL CALLBACK DlgProc(HWND dhwnd, UINT Message, WPARAM wParam, LPARAM lParam)
    {
    
        switch(Message)
        {
    
    	case WM_INITDIALOG:
    
                   char *filelist;
                   filelist = (char*)GlobalAlloc(GPTR,5);
                   filelist = "*.bmp";
    
    	DlgDirListComboBox((HWND)IDD_DIALOG1,//dialog's HWND?
    			filelist,//just bmp's from current dir
    			IDC_COMBO1,//combo box
    			0,
    			DDL_READWRITE);
    
                   return FALSE;
    
    
                   case WM_COMMAND:
                   switch(LOWORD(wParam))
                   {
                    case IDC_BUTTON1:
                    EndDialog(dhwnd, IDC_BUTTON1);//test button
                    break;
    
                    case IDCANCEL:
                    EndDialog(dhwnd, IDCANCEL);
                    break;
                    }
                    break;
    
            default:
                return FALSE;
        }
        return FALSE;
    
    
    }//end of dialog routine
    
    
    
    //dialogue ini, from main window proc
    
            case WM_LBUTTONDOWN:
    			{
                    int ret = DialogBox(GetModuleHandle(NULL), 
    	MAKEINTRESOURC(IDD_DIALOG1),dhwnd,
                    DlgProc);
    			}
    
    		return 0;
    the problem is the files aren't showing, also when I used dhwnd instaed of (HWND)IDD_DIALOG1, for the dialogs handle, a mwmory error message came up
    Thanks, hope some one can help.
    Last edited by Stevo; 06-02-2004 at 07:37 AM. Reason: fix code tags

  2. #2
    Yes, my avatar is stolen anonytmouse's Avatar
    Join Date
    Dec 2002
    Posts
    2,544
    Code:
    char *filelist;
    filelist = (char*)GlobalAlloc(GPTR,5);
    filelist = "*.bmp";
    This is your problem. To copy a string into an array, you must use strcpy or lstrcpy. When you do:
    Code:
    filelist = "*.bmp";
    you set filelist to point to a read-only string and lose its previous contents, in this case the pointer to the memory you allocated on the previous line. DlgDirListComboBox() requires a read-write string so you get the memory error you describe.

    Here is a better version:
    Code:
    // Note that this syntax creates a read-write string.
    // On the other hand char * filelist = "*.bmp"; creates a read-only string.
    char filelist[] = "*.bmp";
    DlgDirListComboBox(dhwnd, filelist, IDC_COMBO1, 0, DDL_READWRITE);
    P.S The end code tag is [/CODE] and the start code tag is [CODE]

  3. #3
    Registered User
    Join Date
    Aug 2003
    Posts
    23
    Thanks, that works now.
    I saw GlobalAlloc() in a tutorial recently, I thought it was a windows way of doing strings or something.

    Thanks again

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