File input - with vars

Hello....I have a quick question:

How do you open a file for input, using a var.
eg. I store "test.map" in the var MapFile.
then I use:

ifstream File1;
File1.open (MapFile);

Why doesn't this work?

Is test.map in your local directory? What variable type is MapFile ?

Yes the test.map is in the same dir as the project file, and the MapFile is a string...

When I use

ifstream File1;
File1.open ("test.map");

instead of

ifstream File1;
File1.open (MapFile);

it works fine...

Also the file is opened in a seperate function:
from the main() i call

LoadMap("test.map");

wich uses the function:

void LoadMap(string MapFile)
{
ifstream File1;
File1.open (MapFile);
...
}

It is a string, as defined in cstring.h?

With this data type, iut will NOT automatically convert to a const char * which is what you need. To get that, you'd need to use

File1.open(MapFile.c_str());