C / C++ / MFC Discussion Boards

CodingLover26-Feb-09 22:13

26-Feb-09 22:13

I want to create a temp file do some process and delete it.

I've create a temp file like this.

	szTempFile = new TCHAR[MAX_PATH];<br />
<br />
	if(!::GetTempFileName(".","temp",0,szTempFile))<br />
	{<br />
		return -1;<br />
	}

It's creating a temp file on the current working folder.

Then I try to delete the file as follows.

<br />
	if(szTempFile != NULL)<br />
	{<br />
		//delete szTempFile;<br />
		HRESULT b = ::DeleteFile(szTempFile);<br />
	}<br />

This not delete the file. When I check the path it's valid but the result of parameter b is 0.

Can someone help me to find the error.

I appreciate your help all the time...
CodingLover Smile | :)

Re: Creating and deleting a temp file

«_Superman_»26-Feb-09 22:23

«_Superman_»

26-Feb-09 22:23

Call GetLastError after DeleteFile and check what it returns.

«_Superman_»
I love work. It gives me something to do between weekends.

Re: Creating and deleting a temp file

CodingLover26-Feb-09 22:46

CodingLover

26-Feb-09 22:46

Yes, I got the error code as 32.
I'm mess with the finding what it means.

I appreciate your help all the time...
CodingLover Smile | :)

Re: Creating and deleting a temp file

«_Superman_»26-Feb-09 22:48

«_Superman_»

26-Feb-09 22:48

It means the file is in use.
You can delete the file only after it is closed using CloseHandle.

«_Superman_»
I love work. It gives me something to do between weekends.

Re: Creating and deleting a temp file

CodingLover26-Feb-09 23:08

CodingLover

26-Feb-09 23:08

Can you bit explain how to use a handle for the file. I just use TCHAR buffer to hold the path. I hope your clear with my previous code segment.

I appreciate your help all the time...
CodingLover Smile | :)

Re: Creating and deleting a temp file

«_Superman_»26-Feb-09 23:49

«_Superman_»

26-Feb-09 23:49

What are you doing after creating the temporary file?
Are you opening it using fopen or CreateFile?
What operations are you doing with the file?

«_Superman_»
I love work. It gives me something to do between weekends.

Re: Creating and deleting a temp file

«_Superman_»26-Feb-09 23:57

«_Superman_»

26-Feb-09 23:57

I read that you're using SHCreateStreamOnFile to open the file.
So you must call pOutFileStream->Release() before you can call DeleteFile.

«_Superman_»
I love work. It gives me something to do between weekends.

Re: Creating and deleting a temp file

CodingLover1-Mar-09 17:40

CodingLover

1-Mar-09 17:40

Yes I've already close the stream before delete the file.

What I'm doing is, create a temp file, then write some data to it. And then read the content into ostream and use that stream for processing. I want to delete the temp file.

When I check the temp file path it's on working folder, like this.

.\ad.tmp

It wont be a case right?

I appreciate your help all the time...
CodingLover Smile | :)

Re: Creating and deleting a temp file

CodingLover1-Mar-09 23:12

CodingLover

1-Mar-09 23:12

Thanks a lot my friends.

I've solve my problem. Actually I didn't properly close one of stream handler in the process.

Thanks again.

I appreciate your help all the time...
CodingLover Smile | :)

Re: Creating and deleting a temp file

Nishad S26-Feb-09 23:06

Nishad S

26-Feb-09 23:06

You might not closing the file properly.

- ns ami -

Re: Creating and deleting a temp file

CodingLover26-Feb-09 23:14

CodingLover

26-Feb-09 23:14

As Superman says, closing the file? Can you please explain a bit more how to do it. Actually I don't have handler to the file, in my code posted before.

I appreciate your help all the time...
CodingLover Smile | :)

Re: Creating and deleting a temp file

Nishad S26-Feb-09 23:19

Nishad S

26-Feb-09 23:19

How is the file opened (or used)?

- ns ami -

Re: Creating and deleting a temp file

CodingLover26-Feb-09 23:23

CodingLover

26-Feb-09 23:23

I use SHCreateStreamOnFile stream on the file. Something like this.

if (FAILED(hr = SHCreateStreamOnFile(szTempFile, STGM_CREATE | STGM_WRITE, &pOutFileStream)))

I appreciate your help all the time...
CodingLover Smile | :)

Re: Creating and deleting a temp file

Iain Clarke, Warrior Programmer26-Feb-09 23:55

Iain Clarke, Warrior Programmer

26-Feb-09 23:55

That stream creation call will be opening the file.

Then you'll need to make sure you call

pOutFileStream->Release ()

at a convenient moment.

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

Re: Creating and deleting a temp file

Soundman32.226-Feb-09 23:23

Soundman32.2

26-Feb-09 23:23

I wonder if Windows is expecting you to call CreateFile on the filename before you delete it?

Have you looked at http://msdn.microsoft.com/en-us/library/aa363875(VS.85).aspx[^] which gives an example of creating and using a temporary file?

GetShortPathName

tom groezer26-Feb-09 21:46

tom groezer

26-Feb-09 21:46

I have an application which uses the win API GetShortPathName to get the short path from a long path[read from registry].
The string is terminated with a '\'. Yet the path returned is not a short path. I do not have access to the machine. What could be the reasons for this. Is there any association with the registry key NtfsDisable8dot3.

How to open Cmd prompt

john563226-Feb-09 20:25

john5632

26-Feb-09 20:25

Hi,

How to open command prompt for spacific folder?

Re: How to open Cmd prompt

«_Superman_»26-Feb-09 20:47

«_Superman_»

26-Feb-09 20:47

I do this by adding a new menu item in the right click menu in windows explorer.

Create the following registry key.
HKEY_CLASSES_ROOT\Folder\shell\Command Prompt\command

Set C:\Windows\System32\Cmd.exe as the Default value.

«_Superman_»
I love work. It gives me something to do between weekends.

Re: How to open Cmd prompt

Nibu babu thomas26-Feb-09 21:07

Nibu babu thomas

26-Feb-09 21:07

Use create process, specify a working folder which will be the starting folder for command prompt...

void OpenCmdInDir( LPCTSTR lpctszDir )
{
   STARTUPINFO StrInf =  { 0 };
   StrInf.cb = sizeof( StrInf );

   PROCESS_INFORMATION pi = { 0 };
   VERIFY( CreateProcess( NULL, "C:\\Windows\\system32\\cmd.exe", NULL, NULL, FALSE, 0, 0, lpctszDir, &StrInf, &pi ));

   // Closing handles since not needed further
   CloseHandle( pi.hProcess );
   CloseHandle( pi.hThread );
}

// Usage
OpenCmdInDir( _T( "C:\\Windows\\System32\\Drivers" ));

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

handle to a window created by createprocess

vijaywithu26-Feb-09 19:53

vijaywithu

26-Feb-09 19:53

I have used createProcess to run a process in a new window using CREATE_NEW_CONSOLE flag,
Can any one help to get the handle to the console that i have created so as to close that window.

code:
CreateProcess(_T("\\windows\\ceplayer.exe"),_T("c:\\folder\\new.wmv"), NULL, NULL, FALSE, CREATE_NEW_CONSOLE, NULL, NULL, NULL, &processInfo);

Thanks in Advance

Re: handle to a window created by createprocess

Slavisa Dojcinovic26-Feb-09 21:27

Slavisa Dojcinovic

26-Feb-09 21:27

You can use EnumWindows() or EnumThreadWindows() to enumerate top level windows and GetWindowThreadProcessid() to check if specific window is created by your process (processInfo.dwProceddId)

Slavisa

Re: handle to a window created by createprocess

vijaywithu26-Feb-09 21:36

vijaywithu

26-Feb-09 21:36

Thanks Slavisa,
I tried it. but it does nothing i donno why..
Could u please help me further with my code below:
(I want to close the console that created within 3 seconds but it is not moving into that if part (bold))

CreateProcess(_T("\\windows\\iesample.exe"),imFullPath, NULL, NULL, FALSE, CREATE_NEW_CONSOLE, NULL, NULL, NULL, &processInfo1);
Sleep(3000);
EnumWindows(&EnumProc,processInfo1.dwProcessId);

BOOL CALLBACK EnumProc(HWND hwnd, LPARAM param)
{

DWORD id = GetWindowThreadProcessId(hwnd, NULL);
if (id == (DWORD)param)
{
DestroyWindow(hwnd);
return false;
}
return true;
}

Re: handle to a window created by createprocess

«_Superman_»26-Feb-09 21:44

«_Superman_»

26-Feb-09 21:44

The return value of GetWindowThreadProcessId is the thread Id and not the process Id.
If you want the process Id, use the second parameter like so.

DWORD dwProcessId = 0;
GetWindowThreadProcessId(hwnd, &dwProcessId);
if (dwProcessId == (DWORD)param)

«_Superman_»
I love work. It gives me something to do between weekends.

Re: handle to a window created by createprocess

vijaywithu26-Feb-09 22:07

vijaywithu

26-Feb-09 22:07

Friens i used
GetWindowThreadProcessId(hwnd, &dwProcessId);
and also PostMessage(hwnd,WM_CLOSE,0);
but it is not moving into that if loop still
if(dwprocessid == DWORD(param))

i could not figure it out what i need to do now or IS there any other way to get the handle of the window
seeking ur help....

Re: handle to a window created by createprocess

Slavisa Dojcinovic26-Feb-09 21:48

Slavisa Dojcinovic

26-Feb-09 21:48

I think it is better to send WM_CLOSE to the window instead of calling DestroyWindow().

Slavisa

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.