fourier alogrithm - C / C++ / MFC Discussion Boards

Neo_MXP25-Sep-05 6:40

25-Sep-05 6:40

'tvh' holds the handle of the TreeView whose items' text I want to grab. The TreeView is of another application currently running. I get its handle through Spy++.

Check this code:

<br />
		int tvhi;<br />
		tvhi = 0x000702A6;<br />
		HWND tvh;<br />
		tvh = (HWND)tvhi;<br />
<br />
		HTREEITEM tvroot;<br />
		tvroot = (HTREEITEM)SendMessage(tvh,TVM_GETNEXTITEM,TVGN_ROOT,0); // get root item<br />
				<br />
		if(tvroot==NULL)<br />
			MessageBox(hWnd,"err1","asdf",MB_OK);<br />
<br />
		TVITEMEX itemobj;<br />
		<br />
		itemobj.mask = TVIF_TEXT; // i've to retrieve text<br />
		itemobj.pszText = text;<br />
		itemobj.cchTextMax = 256;<br />
		itemobj.hItem = tvroot; // i've to work on root item<br />
<br />
		if(!SendMessage(tvh,TVM_GETITEM,0,(LPARAM)&itemobj)) // retrieve text<br />
			MessageBox(hWnd,"err2","asdf",MB_OK);<br />
		else<br />
			MessageBox(hWnd,itemobj.pszText,"asdf",MB_OK);

Now I'm getting the "err2" messagebox. If I send any other message, like to get number of items in treeview or to delete all items in treeview, it works fine. But if I do this to get text of the item, the SendMessage returns false.

Can anybody help, please?

Re: Get Item's Text from a TreeView

PJ Arends25-Sep-05 8:31

PJ Arends

25-Sep-05 8:31

I am sure that what you want to do is possible using dll's and or some such method, but I have have no idea how. You may want to check here[^] or here[^].

The reason what you are trying does not work is because the address of the TV_ITEM structure you are passing has no meaning to the other app. Windows keeps the address spaces of seperate apps seperate.

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Urgent

llp00na25-Sep-05 6:31

llp00na

25-Sep-05 6:31

Dear all,

I want to open a mvc++ project using MVS 2003, everytime i try to do that i get the following message:

"The selected file is not a valid visual studio solution file"

The project i am trying to open, i have developed myself using MVS 2003. I am now trying to open it an another machine.

Any help would be very appreciated. I need to hand it in for correction tommorrow morning. I would value any comments

llp00na

-- modified at 12:32 Sunday 25th September, 2005

Re: Urgent

Anonymous25-Sep-05 13:48

Anonymous

25-Sep-05 13:48

Make sure all service packs are installed

c++ .net template new windows project.

james37725-Sep-05 6:24

james377

25-Sep-05 6:24

iv got c++ .net im trying to create a windows form in c++ I cant load a new project from the templates to do this which template should i load to be able to start playing with some code..

im a beginer at this...

any started code would be great to just to get me going...

thanks james....

Re: c++ .net template new windows project.

james37725-Sep-05 6:28

james377

25-Sep-05 6:28

I am trying to experiment eventually when i get better at using c++, creating finance equations and plotting them on a form using a constructed Chart in C++, Thats my aim...

Thanks James.

CDynLinkLibrary and satellite DLL's

Taka Muraoka25-Sep-05 6:14

Taka Muraoka

25-Sep-05 6:14

I want to internationalize my app and am planning to provide the language resources in their own DLL's.

What would be nice to happen would be to be able to call AfxSetResourceHandle() for the requested language DLL, thus causing MFC to search it for any resources, but if the resource was not found, then fall back to searching the EXE's resources. This removes the need to duplicate icons, bitmaps, etc. in each language DLL.

MFC maintains a list of CDynLinkLibrary's that it searches for resources but I'm having trouble finding out the correct way to insert an entry for the main EXE. Is something like this safe:

static AFX_EXTENSION_MODULE extn = { NULL, NULL } ;
BOOL rc = AfxInitExtensionModule( extn , AfxGetApp()->m_hInstance ) ;
ASSERT( rc ) ;
new CDynLinkLibrary( extn );

Or maybe even just this?

static AFX_EXTENSION_MODULE extn ;
memset( &extn , 0 , sizeof(extn) ) ;
extn.hModule = AfxGetApp()->m_hInstance ;
extn.hResource = AfxGetApp()->m_hInstance ;
new CDynLinkLibrary( extn );

Both seem to work OK but I'm worried that there are some hidden pitfalls in doing this.

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fourier alogrithm

bhamaimrith25-Sep-05 5:38

bhamaimrith

25-Sep-05 5:38

Hi,
i am looking for fourier algorithm in VC++...if anyone can help me...plz it's very urgent...

Re: fourier alogrithm

Mircea Puiu25-Sep-05 6:06

Mircea Puiu

25-Sep-05 6:06

I think J. Martins wrote an article on that here at CP:
http://www.codeproject.com/cpp/howtofft.asp[^]

SkyWalker

Converting LPSTR to BYTE *?

billiam90425-Sep-05 4:08

billiam904

25-Sep-05 4:08

I have a WAVEHDR structure set up and I want to store the data from the lpData element which is of type LPSTR to BYTE * for allocating a memory block using GlobalAlloc and to pass back the pointer of this new memory block.

Does anyone know how I can convert LPSTR to BYTE* to do this or can someone show me how to dump the data from the lpData element of a WAVEHDR structure to a BYTE-based memory buffer? Thanks.

Bill Dennis
Orlando, FL

Re: Converting LPSTR to BYTE *?

C^hris L^osinger25-Sep-05 4:40

C^hris L^osinger

25-Sep-05 4:40

int len = strlen(lpStr);
HGLOBAL hMem = GlobalAlloc(0, len);
memcpy((BYTE*)hMem, lpStr, len);

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Off topic

Jörgen Sigvardsson25-Sep-05 4:42

Jörgen Sigvardsson

25-Sep-05 4:42

I need to ask.. why GlobalAlloc()? Been using it alot lately? Smile | :)

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Re: Off topic

C^hris L^osinger25-Sep-05 4:45

C^hris L^osinger

25-Sep-05 4:45

i use it all the time because you can't use malloc or new to share mem between C++ and VB, for example. but, the original poster mentioned GlobalAlloc, here.

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Re: Off topic

Jörgen Sigvardsson25-Sep-05 4:46

Jörgen Sigvardsson

25-Sep-05 4:46

Chris Losinger wrote:
but, the original poster mentioned GlobalAlloc, here.

D'Oh! | :doh:

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How to diplay RGB color space? Like CColorDialog

followait25-Sep-05 3:54

followait

25-Sep-05 3:54

thanks

Re: How to diplay RGB color space? Like CColorDialog

Jörgen Sigvardsson25-Sep-05 6:22

Jörgen Sigvardsson

25-Sep-05 6:22

I would imagine that a triangle would be most suitable for that.

But why not do it just like CColorDialog or photoshop[^]?

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SetupDiGetDeviceRegistryProperty can work in win98?

szcococut25-Sep-05 3:42

szcococut

25-Sep-05 3:42

msdn:
Client Requires :Windows "Longhorn", Windows XP, Windows 2000 Professional, Windows Me, or Windows 98.
Server Requires :Windows Server "Longhorn", Windows Server 2003, or Windows 2000 Server.

###what is different between client requires and server requires?
that is meant it can work in win98 or can't?

why the code can't work in win98:
BOOL GetRegistryProperty(HDEVINFO DeviceInfoSet,
PSP_DEVINFO_DATA DeviceInfoData,
ULONG Property,
PVOID Buffer,
PULONG Length)
{
while (!SetupDiGetDeviceRegistryProperty(DeviceInfoSet,
DeviceInfoData,
Property,
NULL,
(PVOID)*(TCHAR **)Buffer,
*Length,
Length
))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
//
// We need to change the buffer size.
//
if (*(LPTSTR *)Buffer)
LocalFree(*(LPTSTR *)Buffer);
*(LPTSTR *)Buffer = LocalAlloc(LPTR,*Length);
}
else
{
//
// Unknown Failure.
//
if (GetLastError() != ERROR_INVALID_DATA)
{

}
return FALSE;
}
}
return (*(LPTSTR *)Buffer)[0];

}
here is the exception :
if (*(LPTSTR *)Buffer)
LocalFree(*(LPTSTR *)Buffer);
*(LPTSTR *)Buffer = LocalAlloc(LPTR,*Length);

thanks!

-- modified at 9:43 Sunday 25th September, 2005

modeless dialog

FarPointer25-Sep-05 0:29

FarPointer

25-Sep-05 0:29

hi,
i want to position the dialog box at a certain position
wat is the funtion member in CDialog class for that.
thanx

Re: modeless dialog

toxcct25-Sep-05 1:15

toxcct

25-Sep-05 1:15

see SetWindowPos() and MoveWindow()

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Re: modeless dialog

FarPointer25-Sep-05 4:12

FarPointer

25-Sep-05 4:12

ya thanx

Re: modeless dialog

vikas amin25-Sep-05 23:32

vikas amin

25-Sep-05 23:32

A very simple way to position your
dialogbox if u have created the dialog
by resource editor,
Open the dialogbox in resource editor
Just right click on the dialobox goto properties
in the General Tab u will find at the botom Xpos & Ypos,
thats it change that's it

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

char * = new char[] take me an ERROR!!!!

firefoxrabbit24-Sep-05 22:59

firefoxrabbit

24-Sep-05 22:59

I'm using VC++ .NET, and I want to dinamicaly create a char * string.
I use the following code, but when I try to make the project, I have a error, exactly a link error not a build error!!!!!

char *c = new char [serialNumber->Length];

error LNK2001: unresolved external symbol "void * __cdecl operator new(unsigned int)" (??2@$$FYAPAXI@Z)

Help me please!!! Confused | :confused:

Best regards.

Re: char * = new char[] take me an ERROR!!!!

James_12325-Sep-05 0:21

James_123

25-Sep-05 0:21

I've only used VC++.NET once so i'm not sure if this is the right way to fix it, but when I got the same error... adding msvcrt.lib to the project settings solved the problem.

Progress bar

samira forooghi24-Sep-05 21:33

samira forooghi

24-Sep-05 21:33

i have a progress bar in the modal dialog.
i want show status progress copying file concurrent with copying whit thisdialog.
please help me.
whit special thanks.

Re: Progress bar

Anonymous25-Sep-05 3:23

Anonymous

25-Sep-05 3:23

The basic idea is to move copying to another thread. If you don't want to do it, you can still display progress by regulary processing paint messages. Check sources section of this site (CP, I mean), there are plenty of ready-to use progress dialogs, you will get the idea.

Igor Green
http://www.grigsoft.com/
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