It doesn't like my WriteFile();

Why doesn't my compiler like this?

Code:

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WriteFile("doucument1.txt","Data",0,NULL,OVERLAPPED);

---

This is the error that comes up:

Quote:

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expected primary-expression before ')' token

---

Thanks in advance, August

Probably because OVERLAPPED is the name of the structure. If you didn't open the file with FILE_FLAG_OVERLAPPED, change the last parameter to NULL.

Edit: Source, msdn

Why doesn't my compiler like this?

Code:

---

WriteFile("doucument1.txt","Data",0,NULL,OVERLAPPED);

---

This is the error that comes up:

Quote:

---

expected primary-expression before ')' token

---

Why does it do this, I looked it up here:
http://msdn.microsoft.com/library/en...asp?frame=true
And I did it the way they said.

Thanks.

Even after trying this:

Code:

---

WriteFile("doucument1.txt","Data",0,NULL,NULL);

---

It comes up with this:

Quote:

---

invalid conversion from `const void*' to `void*'
initializing argument 1 of `BOOL WriteFile(void*, const void*, DWORD, DWORD*, _OVERLAPPED*)'

---

My bad. Your first argument should be a handle returned by CreateFile (take a look at msdn for info on that function)

The basic steps in using winapi file io are:

1. Obtain a file handle with CreateFile.
2. Use that file handle to perform write operations (WriteFile) or read operations (ReadFile).
3. Free the file handle when you're done with CloseHandle.

There is an example on this msdn page which should hopefully set you straight on this.

Edit: Thanks mods for merging invidious cross-post into single thread; much appreciated. :)

When I use those the compiler doesn't catch an error or a warning, but when the program is executed a "Program Error" MessageBox comes up. Why is it doing that? I am using Dev-C++.

We're not mind readers...Where's your code? :rolleyes:

here is an example of using WriteFile

Code:

---

HANDLE hFile=CreateFile("file.txt", GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
DWORD dwBytes;
if (hFile!=INVALID_HANDLE_VALUE)
{
  WriteFile(hFile, "Data", 4, &dwBytes, NULL);
  CloseHandle(hFile);
}
else
  MessageBox(NULL, "Error opening file", NULL, MB_ICONERROR);

---

Hey! That works! Thanks, I think I understand it now, I was doing it wrong before. Just one question, would you know how to make breaks? "\n" doesn't work. Thanks.

You might have to use "\r\n" if I recall correctly...

Wow. It worked. Thanks.