MT4 Files Functions Replacement.

codersguru · #1 (**permalink**) 11-20-2005, 02:18 AM

Hi folks,

A lot of people asked me and metaquotes forum about file handling functions.
I think MT4 have a lot of bugs in those functions.
1- They don't work in backtesting
2- They don't write outside "MetaTrader 4\experts\files" path.

Today I opened my Visual C++ and wrote a file handling dll for MT4, I hope you enjoy it, and its source code, and tell me your

.

Setup:
1- Extract the "mtguru1.dll" to "MetaTrader 4\experts\libraries" path.
2- Extract "FilesDemo.mq4" to "MetaTrader 4\experts\indicators" path and compile it.
3- Extract "gFiles.mqh" to "MetaTrader 4\experts\include".
4- Load FilesDemo from your Indicators - don't forget to enbable "Allow DLL Import"
5- Enjoy.

codersguru · #2 (**permalink**) 11-21-2005, 01:22 PM

Hi folks,

Any feedback please

?

fivewhy · #3 (**permalink**) 11-21-2005, 02:39 PM

Well, I haven't tested it. But if it works..that is AWESOME!!
I checked out the demo .mq4 file, and it is so simple and elegant. Good work.

The only issue I have is what to do about new lines.
How do I use gFile to write a new line?

codersguru · #4 (**permalink**) 11-21-2005, 03:09 PM

Quote:

Originally Posted by fivewhy

Well, I haven't tested it. But if it works..that is AWESOME!!
I checked out the demo .mq4 file, and it is so simple and elegant. Good work.

The only issue I have is what to do about new lines.
How do I use gFile to write a new line?

fivewhy,

Thank you very much for your comment.

I think the new line printing issue needs some work from me, Thanks for the notice.

Beluck · #5 (**permalink**) 11-21-2005, 09:48 PM

well done

, but file functions (as well as many other) may be used directly from windows API dlls.

example of file copy function import:

#import "Kernel32.dll"
bool CopyFileA (string source_file, string destination_file, bool if_exist);

with DLLs you can do a lot of things, like SQL database access and so on.

fivewhy · #6 (**permalink**) 11-21-2005, 09:58 PM

where can I find a list of all functions available in kernel32.dll (and other windows .dll's)?

Edit: Found it. See attched.

codersguru · #7 (**permalink**) 11-21-2005, 11:27 PM

Quote:

Originally Posted by Beluck

well done

, but file functions (as well as many other) may be used directly from windows API dlls.

example of file copy function import:

#import "Kernel32.dll"
bool CopyFileA (string source_file, string destination_file, bool if_exist);

with DLLs you can do a lot of things, like SQL database access and so on.

Beluck,
That's right

, but could you give me .mql demo shows me how to use the kernel32 functions CreateFile, OpenFile,WriteFile and ReadFile in MQL4

Code:

HANDLE CreateFile(
  LPCTSTR lpFileName,
  DWORD dwDesiredAccess,
  DWORD dwShareMode,
  LPSECURITY_ATTRIBUTES lpSecurityAttributes,
  DWORD dwCreationDisposition,
  DWORD dwFlagsAndAttributes,
  HANDLE hTemplateFile
);

HFILE OpenFile(
  LPCSTR lpFileName,
  LPOFSTRUCT lpReOpenBuff,
  UINT uStyle
);

BOOL WriteFile(
  HANDLE hFile,
  LPCVOID lpBuffer,
  DWORD nNumberOfBytesToWrite,
  LPDWORD lpNumberOfBytesWritten,
  LPOVERLAPPED lpOverlapped
);

BOOL ReadFile(
  HANDLE hFile,
  LPVOID lpBuffer,
  DWORD nNumberOfBytesToRead,
  LPDWORD lpNumberOfBytesRead,
  LPOVERLAPPED lpOverlapped
);

sx ted · #8 (**permalink**) 11-25-2005, 11:21 AM

alerts.mqh not part of mtguru1.zip, could not run FilesDemo? Thanking you in advance.

codersguru · #9 (**permalink**) 11-25-2005, 02:25 PM

Quote:

Originally Posted by sx ted

alerts.mqh not part of mtguru1.zip, could not run FilesDemo? Thanking you in advance.

sx ted,

I'm sorry, I meant "gFiles.mqh"

To run FilesDemo:

1- Extract the "mtguru1.dll" to "MetaTrader 4\experts\libraries" path.
2- Extract "FilesDemo.mq4" to "MetaTrader 4\experts\indicators" path and compile it.
3- Extract "gFiles.mqh" to "MetaTrader 4\experts\include".
4- Load FilesDemo from your Indicators - don't forget to enbable "Allow DLL Import"

sx ted · #10 (**permalink**) 11-25-2005, 04:07 PM

CodersGuru, thank u super, have u got equivalent of FileTell()