C++ :: Typecasting Char Array To Int (Not Converting)

I am looking for the correct syntax to typecast a character array as an int. So I would be able to do something like this:

char ch[4];
//...Read characters from file into ch or something, etc...
int i = ( int ) &ch;

or

char ch[4];
//...Read characters from file into ch or something, etc...
int i;
strncpy ( ( char* ) &i, ch, 4 )

I want all the 4 characters ( or bytes ) of ch to be classed as an int. So we are taking the 4 bytes of the character array and placing them in 4 bytes of the integer? How would i go about this?