WriteFile help (Win32).

[Sindolist]

This is my first real use of the win32 api for file i/o and I can't seem to get it to work.

The goal is to save an xml file with some config settings when the program exits, but I can't seem to get the stupid file to write anything and I have a feeling I am handling the buffers or the string manipulation wrong.

I'm trying to use the win32 api and not iostream, ect ..

Here's the write file section:

HANDLE hConfig = NULL;
DWORD dwWrittenBuffer = 0;
TCHAR *szWriteBuffer = NULL;


hConfig = CreateFile(
   _T("config.xml"), 
   GENERIC_WRITE, 
   FILE_SHARE_WRITE,
   NULL,
   CREATE_ALWAYS,
   0,
   0);

if(hConfig != INVALID_HANDLE_VALUE)
{

   lstrcat(szWriteBuffer, _T("<config>"));
   // do rest of stuff when this works
   lstrcat(szWriteBuffer, _T("</config>"));
   WriteFile(hConfig, szWriteBuffer, lstrlen(szWriteBuffer) + 1, &dwWrittenBuffer, 0);
   CloseHandle(hConfig);

}

Unfortunately my config file comes out empty, so I'm stumped how I'm supposed to handle this, I don't wanna just do a buttload of WriteFiles line for line, I'd rather write it all at once using lstrcat on a single buffer, like I said I'm probably doing the buffer all wrong so any help would be appreciated.

[jdinger]

In the 2nd to last param you're passing 0. If you look up the values of the possible values, 0 isn't valid.

Try using FILE_ATTRIBUTE_NORMAL there.

hConfig = CreateFile(
   _T("config.xml"), 
   GENERIC_WRITE, 
   FILE_SHARE_WRITE,
   NULL,
   CREATE_ALWAYS,
   0,
   0);