help with old prog

[bat]

Hello, I am trying to get an old C++ program to compile.... it uses bits of Motif so I'm doing it with MinGW/g++ in cygwin with X11 routines installed.... that seems to be working OK, but I can't compile it for the following error:

error: invalid conversion from ‘const void*’ to ‘void*’

Is that a golden oldie?? Anyhow, the offending bit of code is the last line of this....

void fuse_dialog(Widget w)
{
Widget dialog, rc;
XmString string;
Arg args[5];
int n = 0;
static ActionAreaItem action_items[] = {
{ "OK", fuse_ok_pushed, NULL },
{ "PICK AGAIN", pickagain_pushed ,NULL },
{ "QUIT", fuse_cancel_pushed, NULL },
{ "Help", help, "Help Button" },
};

Fraid I'm not a programmer and I don't have access to local expertise. I just want to get it running... (sorry if that doesn't sound responsible!!).

Any clues very much appreciated indeed.

Bests for now, bat.

[vlad from moscow]

Show the definition of ActionAreaItem.

[bat]

Cheers Vlad, I've searched the c++ and helper files and I think this is it, but not sure....

struct ActionAreaItem{
char *label;
void (*XtCallbackProc)(Widget w,XtPointer client_data,XtPointer call_data);
XtPointer data;
};

... this is a nightmare!

[vlad from moscow]

Well, what is the type of XtPointer?

I want to know what object has type void * and whta object has type const void *

You should show the whole error message. Usually such a message contains additional messages that point to object that can not be assigned.

[bat]

Awesome..... here's the rest of the error message (there are others like this but they all have the same pattern)

drawwindow.c++: In function ‘void fuse_dialog(_WidgetRec*)’:
drawwindow.c++:663:5: warning: deprecated conversion from string constant to ‘char*’
drawwindow.c++:663:5: warning: deprecated conversion from string constant to ‘char*’
drawwindow.c++:663:5: warning: deprecated conversion from string constant to ‘char*’
drawwindow.c++:663:5: warning: deprecated conversion from string constant to ‘char*’
drawwindow.c++:663:5: error: invalid conversion from ‘const void*’ to ‘void*’

As for XtPointer, there is no obvious definition in the files I have, but Google gives the following....

XtPointer is a void* used by X Windows.

[vlad from moscow]

The generating of warnings is clear because string lliterals have type const char [] and inside the structure they are assigned to char * instead of const char *. As for void * and const void * I do not see where this conversion is being done.

And I do not understand why you search Google when you have to have include files. Why do you not look through your include files?!