Question

I wanted to convert string into array of bytes. How can i do that ?

Actually i wanted to read from the file and convert all that data into array of bytes .

If converted how can i obtain the size of that array ?

After obtaining array of bytes i wanted to get the pointer of type LPVOID and make it point to that array of bytes , to use the function BOOL WritePrinter(
__in HANDLE hPrinter,
__in LPVOID pBuf,
__in DWORD cbBuf,
__out LPDWORD pcWritten
);

The second argument demands pointer towards array of bytes . But i don’t know any method that does this.

Answer 1

You can convert a string to a char* using

char* bytes = str.c_str();

The length can be obtained through

int len = str.length();

The pointer can simply be casted to LPVOID

LPVOID ptr = (LPVOID) bytes;