OPENFILENAME open dialog - c++

Question

i want to get a full file path by open file dialog in win32.
i do it by this function:
string openfilename(char *filter = "Mission Files (*.mmf)\0*.mmf", HWND owner = NULL) {
OPENFILENAME ofn ;
char fileName[MAX_PATH] = "";
ZeroMemory(&ofn, sizeof(ofn));
ofn.lStructSize = sizeof(OPENFILENAME);
ofn.hwndOwner = owner;
ofn.lpstrFilter = filter;
ofn.lpstrFile = fileName;
ofn.nMaxFile = MAX_PATH;
ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY;
ofn.lpstrDefExt = "";
ofn.lpstrInitialDir ="Missions\\";
string fileNameStr;
if ( GetOpenFileName(&ofn) )
fileNameStr = fileName;
return fileNameStr;
}
it's work fine and return path . but i can't write into the that file i get path of it with openfilename.
note :
i call this code to write to the file (serialization):
string Mission_Name =openfilename();
ofstream ofs ;
ofs = ofstream ((char*)Mission_Name.c_str(), ios::binary );
ofs.write((char *)&Current_Doc, sizeof(Current_Doc));
ofs.close();

Answer 1

Try this for write:
string s = openfilename();
HANDLE hFile = CreateFile(s.c_str(), // name of the write
GENERIC_WRITE, // open for writing
0, // do not share
NULL, // default security
CREATE_ALWAYS, // Creates a new file, always
FILE_ATTRIBUTE_NORMAL, // normal file
NULL); // no attr. template
DWORD writes;
bool writeok = WriteFile(hFile, &Current_Doc, sizeof(Current_Doc), &writes, NULL);
CloseHandle(hFile);
... and read:
HANDLE hFile = CreateFile(s.c_str(), // name of the write
GENERIC_READ, // open for reading
0, // do not share
NULL, // default security
OPEN_EXISTING, // Creates a new file, always
FILE_ATTRIBUTE_NORMAL, // normal file
NULL); // no attr. template
DWORD readed;
bool readok = ReadFile(hFile, &Current_Doc, sizeof(Current_Doc), &readed, NULL);
CloseHandle(hFile);
Help links:
http://msdn.microsoft.com/en-us/library/windows/desktop/bb540534%28v=vs.85%29.aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/aa363858%28v=vs.85%29.aspx

Answer 2

Try closing it and reopen then for writing.