Re: Another InvokeHelper question - C / C++ / MFC Discussion Boards

Re: Update Statusbar from a non-window class method.

Andreas Saurwein23-Sep-02 4:47

Andreas Saurwein

23-Sep-02 4:47

AfxGetMainWnd()->SetMessageText();

...make it about Visual C++, and don't ever mention Visual Basic. Nick Hodapp (MSFT) in Semicolon[^]

Re: Update Statusbar from a non-window class method.

oRion24-Sep-02 3:43

oRion

24-Sep-02 3:43

Thanks for your reply. I have tried to use that statement u mention. It can't work, apparently SetMessageText is not a member of AfxGetMainWnd().

Confused | :confused:

InvokeHelper question

ns23-Sep-02 3:05

23-Sep-02 3:05

I have a VB dll, and a VC client. In this snippet of code from the client :

BOOL _CRemoteCall::MoveProgressBarX(long hPBHWND, long iMin, long iMax)
{
	BOOL result;
	static BYTE parms[] =
		VTS_I4 VTS_I4 VTS_I4;
	InvokeHelper(0x60030002, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms,
		hPBHWND, iMin, iMax);
	return result;
}

how do I get that number 0x600.....? I think what the call does is it calls a particular function from the VB dll, but I just cant figure how out to get that number. Also I hope this number isnt machine specific (just cant be because its hardcoded...)

Thanks,
ns

Re: InvokeHelper question

Anders Molin23-Sep-02 3:57

Anders Molin

23-Sep-02 3:57

It's the DispID of the VB Object, it won't chang from machine to machine..

- Anders

Money talks, but all mine ever says is "Goodbye!"

Another InvokeHelper question

ns23-Sep-02 5:35

23-Sep-02 5:35

Okay. thanks. I dont know how to get this DispID. Is there a procedure outlined somewhere that you know of? Is is somethin that can be answered in a post without too much trouble ?

Thanks,
ns

Re: Another InvokeHelper question

Anders Molin23-Sep-02 5:45

Anders Molin

23-Sep-02 5:45

That depends... The only way I know is using the #import statement to import the dll. Then, in the .tlb-file generated by VC, you can see some const's called IID_SomeName. That's the ones you want Smile | :)

Hope it helps...

- Anders

Money talks, but all mine ever says is "Goodbye!"

Re: Another InvokeHelper question

Lakitu23-Sep-02 7:44

Lakitu

23-Sep-02 7:44

You can use OLE View that comes with VC++ 6.0. You open a typelib, select the appropriate interface (probably an IDispatch-derived one).
Browse through the methods and you'll notice ids.

If a train station is where the train stops, what's a workstation...?

Re: Another InvokeHelper question

ns23-Sep-02 7:58

23-Sep-02 7:58

Wonderful! Thats exactly where I found it (for the sample) after you directed me. APpreciate it!

Then I looked for a tlb in my VB prj folder and there wasnt one! So I have to locate a tlb file for my prj. Wonder if you have to tell VB to make it...
Thanks,
ns

Re: Another InvokeHelper question

Lakitu26-Sep-02 1:36

Lakitu

26-Sep-02 1:36

DLLs usually incorporate the TLB as a resource. OLe View can read those as well. Just load the dll (or exe) instead.

If a train station is where the train stops, what's a workstation...?

How do i know the complated path of a program?

Anonymous23-Sep-02 2:07

Anonymous

23-Sep-02 2:07

I need the complated path to load a library, this library is in the same place that the executable, I see the class CWinApp, but this class doesn´t give me the complated path. Also i have changed the path with m_pszProfilePath but it doesn´t work.

thank in advances.

Re: How do i know the complated path of a program?

Andreas Saurwein23-Sep-02 2:37

Andreas Saurwein

23-Sep-02 2:37

::GetModuleFileName()

...make it about Visual C++, and don't ever mention Visual Basic. Nick Hodapp (MSFT) in Semicolon[^]

Re: How do i know the complated path of a program?

Lakitu23-Sep-02 2:38

Lakitu

23-Sep-02 2:38

Use GetModuleFileName()

If a train station is where the train stops, what's a workstation...?

conversion

Anonymous23-Sep-02 0:51

Anonymous

23-Sep-02 0:51

hi all,

can u tell me how to convert a BSTR to char(i want to display the bstr value)

Re: conversion

Lakitu23-Sep-02 0:55

Lakitu

23-Sep-02 0:55

Use the OLE2T() macro.

Look! They have the Internet on computers now! (Homer J. Simpson)

Re: conversion

jmkhael23-Sep-02 2:09

jmkhael

23-Sep-02 2:09

Or assign it to a CString, or use _bstr_t

Papa
Murex Co.

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: conversion

Rashid Thadha23-Sep-02 2:40

Rashid Thadha

23-Sep-02 2:40

e.g BSTR bstrValue

_bstr_t bstrTemp(bstrValue);
CString sValue = (LPCTSTR)bstrTemp;

Re: UnregisterClass and atoms

Lakitu23-Sep-02 0:47

Lakitu

23-Sep-02 0:47

Use MAKELONG(hAtom, 0) where hAtom is your ATOM value you got from RegisterClassEx.

Look! They have the Internet on computers now! (Homer J. Simpson)

Re: UnregisterClass and atoms

Lakitu23-Sep-02 1:12

Lakitu

23-Sep-02 1:12

no problem, always happy to help Roll eyes | :rolleyes:

If a train station is where the train stops, what's a workstation...?

Re: UnregisterClass and atoms

Lakitu23-Sep-02 2:37

Lakitu

23-Sep-02 2:37

Just cast it to a LPCTSTR like so: (LPCTSTR)MAKELONG(...)

If a train station is where the train stops, what's a workstation...?

Re: UnregisterClass and atoms

Andreas Saurwein23-Sep-02 2:45

Andreas Saurwein

23-Sep-02 2:45

adrian cooper wrote:
while(beerInFridge()) {

You should make this a member of CKitchen and get a instance, instead of a global function. You might get the beerlevel of some foreign fridge. (besides of a possible beerleak) Laugh | :laugh:

...make it about Visual C++, and don't ever mention Visual Basic. Nick Hodapp (MSFT) in Semicolon[^]

VB call 'C" dll, not C++ dll

DC23-Sep-02 0:32

23-Sep-02 0:32

When I use VB.NET to call a 'C' dll. It displayed error as follow

ERROR
=====
"Object reference not set to an instance of an object."

'C' FILE (Not C++, so hasn't used _stdcall)
===========================================
BOOLEAN WINAPI PacketGetAdapterNames(PTSTR pStr,PULONG BufferSize)

'DEF' FILE
==========
EXPORT
PacketGetAdapterNames

In VB.NET
=========
Private Declare Function PacketGetAdapterNames Lib "packet.dll" (<marshalas(unmanagedtype.lpwstr)> ByVal lpBuf As String, <marshalas(unmanagedtype.u8)> ByVal BufferSize As Long) As Boolean
.
.
lSuccess = PacketGetAdapterNames(Name, Size)
.

It display error.

More investigation
==================
I try to use "LoadLibrary" and "GetProcAddress" to test its existence. It hasn't reported error.

I also write another routine in C++ with same argument, no error.

So, any ideas on how to call this 'C' routine in VB ?

Danny

String problem

chen23-Sep-02 0:14

chen

23-Sep-02 0:14

Hi,

I have a long string which is obtained from the other class.
Now i want add this string into my ListBox in main dialog.
I can get the string but it cannot be added as i expected.
The problem is how to splite the string with separate point
"\\"?

My string looks like :

"this is one \\ this is two \\ this is three \\ ..........."

The expected format when added the string into listbox should be:

This is one
this is two
this is three
..........

Thanks in advance!

chen

Re: String problem

Lakitu23-Sep-02 0:21

Lakitu

23-Sep-02 0:21

Split up the string using strtok() or the Tokenize() CString member if you're using MFC.

Look! They have the Internet on computers now! (Homer J. Simpson)

Getting version number of IUnknown interface?

Jonathan de Halleux22-Sep-02 23:29

Jonathan de Halleux

22-Sep-02 23:29

Here's an example: I get the CLSID of the program using CLSIDFromString, how do I get the version number?

Jonathan de Halleux, Belgium.

Re: Getting version number of IUnknown interface?

Lakitu23-Sep-02 0:14

Lakitu

23-Sep-02 0:14

First of all, interfaces don't have version numbers, they are supposed to be immutable. You can get the version of the executable that implements the interface by using the GetFileVersionInfo and related APIs.

Look! They have the Internet on computers now! (Homer J. Simpson)

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