dev-cpp-users

[Dev-C++] IDC_NUMBER, windows programming

[Jorge A. <jab...@ma...>]

Does anybody know why this piece of code does not work? It gives me an "invalid pointer operation".

//this is part of main.h file

#define IDD_ABOUT          100
#define IDC_MAIN_TEXT      1001
#define IDI_ICON           1
#define IDD_DIALOG         600
#define IDC_NUMBER         610
........

//this is part of the resource file

600 DIALOG DISCARDABLE 0, 0, 300, 150
STYLE WS_VISIBLE | WS_SYSMENU | WS_POPUP | WS_CAPTION | DS_MODALFRAME   
CAPTION "Dialog Box Example"
FONT 8,"Helv"
BEGIN
    ICON            1,5,11,17,20,20
    DEFPUSHBUTTON   "&OK",IDOK,220,18,50,14
    PUSHBUTTON      "&Cancel",IDCANCEL,220,35,50,14
    GROUPBOX  "Random Numbers Generator Version 1.0",102,7,60,200,60
    CTEXT     "dialog box example", 103,40,75,130,40
    LTEXT     "Low Limit",103,7,10,50,8
    LTEXT      "High Limit",103,7,20,50,8
    EDITTEXT        IDC_NUMBER,150,7,21,14,ES_NUMBER
.....
Instead if I eliminate the "#define IDC_NUMBER 1100" line of the main.h file and make "EDITTEXT        610,150,7,21,14,ES_NUMBER" IT WORKS!!

Thanks. 

JEA

RE: [Dev-C++] IDC_NUMBER, windows programming

[Abhijit S. <mu...@gm...>]

> Does anybody know why this piece of code does not work? It gives
> me an "invalid pointer operation".

Have you actually #include'd main.h from resource.h? If not, try including
it. If it gives errors, move all the resource-related defines into a
separate file (usually with an extention .rh) and included it in both the
main header and resource file. It would be a good idea to make the rh file
re-entrant using this technique:

-- start file `foo.rh' --

#ifndef _FOO_RH
#define _FOO_RH

#define IDC_NUMBER 610

#endif // _FOO_RH

-- stop file `foo.h' --

If you understand how a pre-processor works, this should make sense. The
_FOO_RH is only convention (generated from the filename). You can name it
anyway you like, as long as it doesn't conflict with any other macros.

HTH.

--
Abhijit Shylanath
Homepage: http://mudeth.tripod.com/