Populating MultiByte Datatypes With Void Pointers To Unsigned Char's?

Im doing some binary datafile processing, and im reading the whole file in as a vector of unsigned bytes. If i were to populate a 4 byte object like an unsigned int one byte at a time how would i go about it?

Let me illustrate what im trying to do:

Code:

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std::vector<unsigned char> FileContents;
//Assume i populate FileContents here, and its correctly filled.
unsigned int test; //4 bytes, i want to set the first byte to FileContents[5] and the second to [6] etc

//obviously this is incorrect, im just fishing for the correct way to do it.
void * TheVoid;
TheVoid = &test;
TheVoid[0] = *FileContents[5];
TheVoid[1] = *FileContents[6];
...

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Does this make sense? Am i missing some critical thing that will make my life easier?

Thanks for your time.

.

Code:

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int i;
char * p = (char*)&i;
p[0] = fc[6];
p[1] = fc[7];
p[2] = fc[8];
p[3] = fc[9];

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of course a much easier way to do it would be:

Code:

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int i = *((int*)(&fc[6]));

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just keep in mind that the file needs to originate from a system with the same endian-ness as the program working with it, otherwise anything larger than a byte will be read incorrectly.

Thanks for the fast reply SEB, as always your a great help. Im trying to read in this ugly binary datafile and the refrence i have for it says field length is one size but it turns out to be another in a hex editor =( I loathe bad datatype refrences.

Thanks again,

DBM