How to properly create and write to file?

[Zapeth]

Hi I am currently trying to create a file and write some content into it :P

However I believe that either the something with the path is wrong or I am doing the creation of the file wrong (maybe some attributes wrong?), anyway here's the source:

CreateFile(path, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL) //path is something like ".\\folder\\[e-mail]\\file.txt"
char* buffer = "some long content";
		
FILE* newFile = fopen(path, "w+");
fwrite(buffer, size, 1, newFile);
fclose(newFile);

he successfully creates the empty file with the Windows API Function, however he then crashes at fwrite with

"Debug Assertion Failed!
...
File: ...\src\frwrite.c
Line: 77

Expression: (stream != NULL)

...Press Retry to debug... 

someone know what could be the problem?

[modoran]

The fopen call returns NULL in your case.
Why are you mix winapi functions with CRT functions ? Use WriteFile instead.

[Zapeth]

Well in order to use WriteFile I need a handle which I can only get by using FILE* newFile = fopen(path, "w+"); or did I misunderstand something here?

Also I used it before instead of fwrite() and fclose() but it also didnt work (and I dont know how to read the error that GetLastError() returns).


edit: I simply made a DWORD where I saved the return value in so I could read it out. what I got was 6 so I assume the corresponding error code is 0x6 which would be ERROR_INVALID_HANDLE, just as I supected.

maybe you could explain why fopen returns NULL? thanks

edit: I managed to kind of solve the problem (by rewriting some code and using different functions).