C / C++ / MFC

Re: Platform SDK installing !

4-Feb-03 4:03

1- Add include, src, lib directories to VC directories (Tools, Options, Directories)
2- VC searches header files and their implementations from that list. In other hand it searches first directory then seconde one and so on. When find desired file, using it for compiling. Because of this no conflicting will occured.
3- Find the latest PSDK from Microsoft.com

A. Riazi

ursus zeta4-Feb-03 12:26

ursus zeta

4-Feb-03 12:26

I recently installed the May 2002 SDK just to have a look around and compare headers, test the tools, etc. It's a monster for a novice (as I am), but the Help documentation alone make the lengthy install worth it. Like the two previous posters, it's simple to set the directory paths in Visual C++ to the SDK include and library folders. There is a help page in the documentation that instructs you, in simple understandable language.
I tried it on a couple of simple programs that I'd put together for Windows 98, and usually it compiles correctly (as there are no significant changes in the headers). Then I tried it on a more complex programs written for Windows 2000, and I got (predictably) numerous error messages or, when it compiled, message boxes with error messages when launched. The new functions or altered parameters for old functions will operate incorrectly with the older Windows 98 Systems calls, and you will get those annoying message boxes with mysterious IDs and obscure functions.
However, it's worth the time to familiarize yourself with the process, and when you upgrade to a newer Windows version, the virtual chaos will not cause you undue mental distress and anguish.

NT/Win2K/XP Maximum File Size

Glynn4-Feb-03 1:30

Glynn

4-Feb-03 1:30

Is it possible to create a file >2GB under NT/2K/XP
with normal Admin permisions.

I have tried:

CreateFile(...)
SetFilePointer(...)

but this fails with something like "permissions not correct"
please point me in the right direction

xxhimanshu4-Feb-03 2:06

xxhimanshu

4-Feb-03 2:06

i dont think this is possible becz they allow a max partition of 2 gb and so i think that it is not possible to make a file size greater than that..anyway keep searching mayb u find a way thru..
cheers

himanshu

Abbas_Riazi4-Feb-03 4:06

4-Feb-03 4:06

Did you use GENERAL_WRITE?
A. Riazi

Glynn5-Feb-03 1:16

Glynn

5-Feb-03 1:16

'fraid so, did everything the online help system told me

code is below:

ULARGE_INTEGER i64FreeBytesToCallerC;
ULARGE_INTEGER i64TotalBytesC;
ULARGE_INTEGER i64FreeBytesC;

ULARGE_INTEGER i64FreeBytesToCallerD;
ULARGE_INTEGER i64TotalBytesD;
ULARGE_INTEGER i64FreeBytesD;

BOOL bSuccess = GetDiskFreeSpaceEx("C:\\",
(PULARGE_INTEGER)&i64FreeBytesToCallerC,
(PULARGE_INTEGER)&i64TotalBytesC,
(PULARGE_INTEGER)&i64FreeBytesC);

bSuccess = GetDiskFreeSpaceEx("D:\\",
(PULARGE_INTEGER)&i64FreeBytesToCallerD,
(PULARGE_INTEGER)&i64TotalBytesD,
(PULARGE_INTEGER)&i64FreeBytesD);

HANDLE hFile = ::CreateFile("C:\\File",GENERIC_WRITE|GENERIC_READ,
GENERIC_ALL,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL
);

long dwHighPart = i64FreeBytesC.u.HighPart ;

DWORD result = ::SetFilePointer(hFile, i64FreeBytesC.u.LowPart, &dwHighPart, FILE_BEGIN);

OMG | :OMG:

Mike Nordell5-Feb-03 4:05

Mike Nordell

5-Feb-03 4:05

You must (at least) take into account that creating a new file will probably allocate at least one cluster, and as the file grows it would probably need several more runs/clusters just to describe the layout of the file on disk.

Try reducing the size of the file you want to create, one page at a time, and I'm sure you'll see that sooner or later the SetFilePointer call will succeed.

Oh, another thing, be prepared that the process can, or more likely will hang for the duration of time needed to actually write NULL's to the filesize you requested (and it can't be terminated, not even by trying to kill it by Task Manager, since it's "hanging" in kernel-mode), why your machine could become "less useful" for other work in the time needed to zero-fill this file.

++luck;

Update AppName in TaskBar

Mike Nordell5-Feb-03 0:34

Mike Nordell

5-Feb-03 0:34

Glynn wrote:
Is it possible to create a file >2GB under NT/2K/XP
with normal Admin permisions.

Absolutely. IIRC you can create files as large as 2^48 bytes (good luck finding any disks that large! Smile | :)

).

What you might experience is a problem with the filesystem? FATn have problems with large files (though I believe that error should only pop up around 4GB-1).

Maybe you just have a parameter problem for SetFilePointer?

Disk quota might be another thing that could limit you.

leander4-Feb-03 1:25

leander

4-Feb-03 1:25

I want to force the update of the title of my application which appears in the taskbar.
I explain :
In my application (MFC), I have a Big Algorithm which take time. In the main loop of this Algorithm, I update the application name to display the percent. (The name look like : "MyAppli - 15%"). The Title of my application is correctly update by windows, but the Title of my application in the taskbar was not update until the end of the algorithm.
If I put a breakpoint in my algorithm, visual update the title in the taskbar... So I image, my algorithm use to CPU, to let the taskbar update itself.

I have try to add this code in the main loop when I change the title :

UInt32		ui32GotMsg;
MSG		message;

SetWindowText( szPercent );
// translate messages
while (true)
{
	ui32GotMsg = ::PeekMessage( &message, NULL, 0U, 0U, PM_REMOVE | PM_NOYIELD );
	if (0 != ui32GotMsg)
	{
		// Translate and dispatch les messages
		::TranslateMessage( &message );
		::DispatchMessage( &message );
	}
	else
	{
		break;  // Stop dispatch and return to the MainLoop.
	}
}

But, the title in the taskbar doesn't update... I have try to put the code
AfxGetApp->OnIdle(0) just after the 'SetWindowText()' but it doesn't work.

How I can do to force the update of the title of my application in taskbar ?

Re: Update AppName in TaskBar

Abbas_Riazi4-Feb-03 4:18

Re: Update AppName in TaskBar

4-Feb-03 4:18

Change your code to this:

UInt32 ui32GotMsg;
MSG message;

// translate messages
while (true)
{
	ui32GotMsg = ::PeekMessage( &message, NULL, 0U, 0U, PM_REMOVE | PM_NOYIELD);
	if (ui32GotMsg != 0)
	{
		// Translate and dispatch les messages
		::TranslateMessage( &message );
		::DispatchMessage( &message );
	}
	else
	{
		SetWindowText( szPercent );
	}
}

I hope this works!
A. Riazi

leander4-Feb-03 4:52

leander

4-Feb-03 4:52

I have try it, but it doesn't works. (And I must put a break after the SetWindowText( szPercent ); because I must give back CPU time to my algorithm.

My code seem like this :

void BigFunction()
{
      for(i=0; i<ui32NbLoop; i++)
      {
            // Make lot of calculation
            ....

            // Call to the function which Set the Application Title and Translate some messages.
            SetWindowsTile();
      }
}

void SetWindowsTile()
{
     // Translate message
     while (true)
     {
 	ui32GotMsg = ::PeekMessage( &message, NULL, 0U, 0U, PM_REMOVE | PM_NOYIELD);
	if (ui32GotMsg != 0)
	{
		// Translate and dispatch les messages
		::TranslateMessage( &message );
		::DispatchMessage( &message );
	}
	else
	{
		break; // Or Return;
	}      
     }
}

Intefacing a database with ANSI C++

Jerome Conus4-Feb-03 1:07

Jerome Conus

4-Feb-03 1:07

Hi !!

I don't have any idea of how to do it, but here is something I'd like to do :

- Develop an app in C++, which would be portable for Windows and Linux.
- This app would have to interface a database (Oracle ? Any better database ?)

I would appreciate any hints on how to do it, or places where I could start searching.

Thanks !
Jerome

markkuk4-Feb-03 1:22

markkuk

4-Feb-03 1:22

The following class libraries may help:

Jerome Conus4-Feb-03 1:27

Jerome Conus

4-Feb-03 1:27

Thanks for the quick answer !

I'm sure I'll find plenty of usefull informations in the links you provided.
A question comes to my mind though...Is ODBC the only way to do it ? Or is it the easiest ? Does it exists on Linux ?

Thanks again for your help !
Jerome

markkuk4-Feb-03 5:47

markkuk

4-Feb-03 5:47

ODBC is the most portable way, it exists in Linux/Unix and you can write database-independent code with it (with some effort).

karl_w4-Feb-03 2:21

karl_w

4-Feb-03 2:21

If you know what DB you will use and you know it won't change, you can use the API of your DB. I think most of the known DBs have at least a C Interface you can use.

For Oracle look for OCI (Oracle Call Interface) in the Oracle-Docs (online at otn.oracle.com[^] )

<--edit-->
Forgot to mention Pro*C/C++ Precompiler for Oracle. With this precompiler you can write your SQL-Statemetns simply into your C/C++ code. Then run the precompiler. It will subsitute your statements with the correct OCI-calls.
<--edit-->

If you don't know what DB you will use or you want to be able to change it very easy you can use ODBC.

The hardest way: You can implement a generic Data-Access-Class in combination with a Wrapper-Class for each DB-API. So you just replace your wrapper class and you can use another DB. Big Grin | :-D

--

karl

SHBrowseForFolder (Can we get more control over it?)

Jerome Conus4-Feb-03 3:32

Jerome Conus

4-Feb-03 3:32

Thank you for your help, and for the link ! (and also for your suggestion about the hard-way....which I'll try to avoid !!!!)

Jerome

Anand Vinod4-Feb-03 0:35

Anand Vinod

4-Feb-03 0:35

Hi,

I'm using SHBrowseForFolder Shell API, in my program to select a Folder. I have been able to Display only Drives by initializing a ITEMIDLIST got from SHGetSpecialFolderLocation, in the BROWSEINFO structure.

I dont want to display the Floppy Drive - Letter and the CD ROM Drive Letter. Also among the File System Drives, I want to only display drives (Drive Letters), that have a NTFS File System. Is there any way in which this can be done? i.e Can i filter out the drives that i dont want to display from the dialog that SHBrowseForFolder puts up?

Also can I use SHBrowseForFolder to display Drives and Folders from a Remote System?

Any information regarding this would be a great help.

Regards
Anand

Re: SHBrowseForFolder (Can we get more control over it?)

Abbas_Riazi4-Feb-03 4:34

Re: SHBrowseForFolder (Can we get more control over it?)

4-Feb-03 4:34

For this purpose, do not use SHBrowseForFolder. Instead use source code of these articles:
http://www.codeproject.com/useritems/DriveBrowsingTree.asp
and
http://www.codeproject.com/treectrl/shelltreectrl.asp
A. Riazi

Anand Vinod4-Feb-03 18:35

Anand Vinod

4-Feb-03 18:35

Thanks Riazi, This code was really a help, a little modification should get me going.

Thanks
Anand

Re: SHBrowseForFolder (Can we get more control over it?)

Abbas_Riazi5-Feb-03 0:24