code listed here is Copyright 2009 Jim Michaels. some may have earlier copyright dates.

get 64-bit filesize from windows based on filename

//Copyright 2007,2009,2009 Jim Michaels
#include <windows.h>
LARGE_INTEGER li;
__int64 filesize64=0;
li.QuadPart=0;
HANDLE h=CreateFile(
  lpFileName, // pointer to name of the file
  GENERIC_READ, // access (read-write) mode
  FILE_SHARE_READ,  // share mode
  NULL, // pointer to security attributes
  OPEN_EXISTING, // how to create
  FILE_ATTRIBUTE_NORMAL,  // file attributes
  INVALID_HANDLE_VALUE // handle to file with attributes to copy
);
if (INVALID_HANDLE_VALUE != h) {
    DWORD d0, d1;
    d0=GetFileSize(
      h,  // handle of file to get size of
      &d1 // pointer to high-order word for file size
    );
    if (0xFFFFFFFF==d0) {
        DWORD er=GetLastError();
        if (NO_ERROR==er) {
            li.LowPart=d0;
            li.HighPart=(LONG)d1;
            filesize64=li.QuadPart;
        } else {
            //ERROR: problem getting filesize.
        }
    }
    CloseHandle(h);
} else {
    //ERROR: could not open file.
}
//at this point, filesize is in both filesize64 and li.QuadPart
//for sprintf, use "%I64d" 

for WinMain(), simulate/generate argc, argv from lpCmdLine parameter using an STL vector of strings.

//Copyright 2009 Jim Michaels
int argc;
//simulate command line
vector<string> argv;
int argvi=0; //argv index, used in place of argv++
string scmdline=lpCmdLine; //from WinMain() parameter
int argc;
int i1=0, i2=0;
while (i2 < scmdline.size()) {
    //find first non-space
    while ('\0'!=lpCmdLine[i1] && isspace(lpCmdLine[i1])) {
        i1++;
        i2++;
    }
    while ('\0'!=lpCmdLine[i2] && !isspace(lpCmdLine[i2])) {
        i2++;
    }
    if (i2!=0 && i1!=i2) {
        //we have an argument.  push it on the vector/array.
        if (lpCmdLine[i1]=='"' && lpCmdLine[i2-1]=='"') {
            argv.push_back(scmdline.substr(i1+1, i2-i1-2));
        } else {
            argv.push_back(scmdline.substr(i1, i2-i1));
        }
        i1=i2; //i1 catch up to i2 now
    }
}
argc=argv.size();