Pointer problem...

[Structural Integrity]

I'm trying to pass a void pointer with a function so I can use sprintf to put it in a string. Problem is that I cannot get the value behind the pointer:

void Game3D::setParam(char* filename, char* preset, void* value, char type)
{
	char ln[100];
	char newline[100];

	sprintf(ln,"%s %%%c",preset,type);	//result: NEWLINE = <preset> %<type>
	sprintf(newline,ln,*value);			//result: NEWLINE = NEWLINE, with %<type> replaced

	MSGBOX(newline);

The second sprintf causes the problem, where I try to get the value behind the value pointer. This syntax gives an "illegal indirection" error. If I leave the '*' out I get the address of the pointer.

Anyone know how I can make this work? The value behind the pointer can be a bool, float or int.

[Pitchfork]

I think, u have to cast value depending on type:

like:
if(type == "f") sprintf(newline,ln,*((double*)value));
else if(type == ...

[pablissimo]

Originally posted by Structural Integrity
I'm trying to pass a void pointer with a function so I can use sprintf to put it in a string. Problem is that I cannot get the value behind the pointer:

void Game3D::setParam(char* filename, char* preset, void* value, char type)
{
	char ln[100];
	char newline[100];

	sprintf(ln,"%s %%%c",preset,type);	//result: NEWLINE = <preset> %<type>
	sprintf(newline,ln,*value);			//result: NEWLINE = NEWLINE, with %<type> replaced

	MSGBOX(newline);

The second sprintf causes the problem, where I try to get the value behind the value pointer. This syntax gives an "illegal indirection" error. If I leave the '*' out I get the address of the pointer.

Anyone know how I can make this work? The value behind the pointer can be a bool, float or int.

Can you not just create 3 overloaded functions changing void* value to bool*, float*, int* and then hope it picks up the right one?

[Structural Integrity]

I don't think overloading would be wise... my Game3D file is cluttered enough as it is.
Instead, I made a switch for the int and float and two different sprintf's and used the casting idea of Pitchfork.
The only problem I have now is a boolean. I used to pass them as an unsigned int and hoped that they are converted properly in the read variant of this function, but it appears this doesn't work in this case. It make a 0xffff of the bool, regardless of the value. Any ideas for this? Is there a conversion string ("%b" or so) for a boolean? My book doesn't list it.

[pablissimo]

Another switch and a temp var storing an int value of 0 or 1? Then %d that...

[Pitchfork]

bool is defined via:
typedef int BOOL;
so at a quick look you should simply treat them as int

[queball]

sprintf("%s", *(BOOL *)value ? "верно" : "Не верно")?

[Cyp]

Originally posted by queball
sprintf("%s", *(BOOL *)value ? "верно" : "Не верно")?

I've actually been wondering why MSVC doesn't seem to compile unicode .cpp files.

Think it's silly not being able to use variable names such as θ and Δx.