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Hello,
I want to create a C# DLL that passes out a string as a parameter. I have tried this (partial code):
[C# Code]
public interface iInterface1
{
[System.Runtime.InteropServices.DispId(13)]
void Call13(
[System.Runtime.InteropServices.In]
[System.Runtime.InteropServices.Out]
[System.Runtime.InteropServices.MarshalAs(
System.Runtime.InteropServices.UnmanagedType.BStr)]
ref string s1);
[System.Runtime.InteropServices.DispId(17)]
void Call17(
[System.Runtime.InteropServices.In,
System.Runtime.InteropServices.Out,
System.Runtime.InteropServices.MarshalAs(
System.Runtime.InteropServices.UnmanagedType.LPWStr)]
ref System.String s1);
}
[C++ Code]
BSTR s;
m_int0.Call13(&s);
[C++ Code]
LPWSTR s2;
m_int0.Call17(&s2);
The programs compile, but do not run:
The C++ call to Call13 gives me the message "Not enough storage is available to complete this operation".
The C++ call to Call17 in Debug mode shows that there is a breakpoint in the program:
"This may be due to a corruption of the heap, and indicates a bug in go2.exe or any of the DLLs it has loaded."
Does anyone have any ideas?
Regards,
Mike
modified on Wednesday, April 15, 2009 10:23 AM
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Hi
My VB.NET Library references ADODB. When I build it, the above message comes out.
Should I run tlbimp.exe ?
Thanks
Marcello Turnbull
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You may need a strong name key file. Investigate Project Properties->Signing:
Sign the assembly
Choose a strong name key file
Regards,
Mike
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Hi all,
I am new to COM,
and i use MFC for developing com
I developed an out process server(Automation Server) and i exposed a singleton comobject to outside world
to achieve singleton what i have done is inherited a class from COleObjectFactory and override the OnCreateObject in the derived class and it looks like this
CCmdTarget* CSingletonFactory::OnCreateObject()
{
//static CServer m_sServer;
//return &m_sServer;
if (m_Server == NULL)
{
m_Server = new CServer;
}
return m_Server;
}
and i wrote a client that too in MFC which just creates the object every time i click start button
(here always it returns same object's IDispatch pointer)
void CComClientDlg::OnBnClickedStart()
{
// TODO: Add your control notification handler code here
CLSID id = { 0xe856e42c, 0xe479, 0x4008, {0xb2, 0xf8, 0x1, 0xec, 0x9e, 0x5a, 0x84, 0x63} };
COSERVERINFO si;
si.pwszName = OLESTR("127.0.0.1");
si.pAuthInfo = NULL;
si.dwReserved1 = 0;
si.dwReserved2 = 0;
MULTI_QI rgmqi;
rgmqi.pIID = &IID_IDispatch;
rgmqi.pItf=NULL;
rgmqi.hr=S_OK;
HRESULT hresult = ::CoCreateInstanceEx(
id,
NULL,
CLSCTX_LOCAL_SERVER,
&si, 1, &rgmqi);
if (hresult == S_OK)
{
//hmmm success
;
}
}
but wat happens is when i click the start button 6 times my server is getting crashed
running in debugger alone i could able to find the crash(if not in debugger my server is getting shutdown silently and opening again)
In Debugging what i have found is the reference count of my object is steady getting reduced,
when i try to create the object first time(first time when the OnBnClickedStart is called) the ref count is 0 and next time it becomes 4(i dono how) and when i continuously call OnBnClickedStart for six time server crashes)
am i missing some thing here?
As it is a singleton should i give my one addref and release?
help me please
Thanks,
Jey
jey
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For one of my customers I simply used the TAPIRequestMakeCall method for making an outgoing call.
The problems is that it triggers Windows Dialer which popups 2 windows.
This is very annoying.
So I am looking for another way to make an outgoing call (not using the requestmakecall method) using the TAPI3LIB.
So my question is, what is the minimum required code/steps for making an outgoing call?
The article at http://msdn.microsoft.com/en-us/library/ms733298(VS.85).aspx[^]
Seems to have too much overhead for me.
Can anyone help me out here?
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I'm at the end of my rope here... I've been bashing my head on my keyboard for the last week trying to figure out this issue.
I'm trying to display a flash control on a DirectDraw surface and my call to AtlAxAttachControl fails - preventing the flash player from appearing within the control.
Here's a stripped down version of my code:
#pragma once
#include <string>
#include <windows.h>
#include <exdisp.h>
#include <mshtmlc.h>
#include <atlbase.h>
#include <atlcom.h>
#include <atlwin.h>
using std::string;
#import "PROGID:ShockwaveFlash.ShockwaveFlash" no_namespace raw_interfaces_only
typedef HRESULT (WINAPI *LPAtlAxWinInit) ();
typedef HRESULT (WINAPI *LPAtlAxGetControl)(HWND hwnd, IUnknown** unk);
class FlashViewer
{
public:
FlashViewer();
~FlashViewer();
bool Init(int Width, int Height);
void OpenFlash(const char* filename);
void DrawToSurface(LPDIRECTDRAWSURFACE7 lpdds);
private:
int mViewerWidth;
int mViewerHeight;
HWND mViewerWnd;
IShockwaveFlash* mFlashCtrl;
};
FlashViewer::FlashViewer()
{
mViewerWidth = 0;
mViewerHeight = 0;
mViewerWnd = 0;
mFlashCtrl = NULL;
}
FlashViewer::~FlashViewer()
{
DestroyWindow(this->mViewerWnd);
if (this->mFlashCtrl != NULL)
{
this->mFlashCtrl->Release();
this->mFlashCtrl = NULL;
}
}
bool FlashViewer::Init(int width, int height)
{
LPAtlAxWinInit AtlAxWinInit3 = (LPAtlAxWinInit)GetProcAddress(LoadLibrary("atl"), "AtlAxWinInit");
LPAtlAxGetControl AtlAxGetControl3 = (LPAtlAxGetControl)GetProcAddress(LoadLibrary("atl"), "AtlAxGetControl");
MSG msg;
HRESULT hr = AtlAxWinInit3();
HWND hwnd = CreateWindow("AtlAxWin", "", WS_VISIBLE|WS_POPUP, 0, 0, 1024, 768, 0, 0, 0, 0);
IShockwaveFlash* flash = 0;
hr = CoCreateInstance(__uuidof(ShockwaveFlash), 0, CLSCTX_ALL, __uuidof(IShockwaveFlash), (void **)&flash);
hr = flash->put_WMode(L"transparent");
hr = flash->put_Loop(true);
hr = AtlAxAttachControl(flash, hwnd, NULL);
hr = flash->put_Movie(L"c:\\FrontEnd.swf");
long pVal = -1;
flash->get_ReadyState(&pVal);
return true;
}
void FlashViewer::OpenFlash(const char *filename)
{
this->mFlashCtrl->LoadMovie(0, _bstr_t(filename));
}
void FlashViewer::DrawToSurface(LPDIRECTDRAWSURFACE7 lpdds)
{
if (this->mViewerWnd == NULL)
return;
RECT rect = {0, 0, this->mViewerWidth, this->mViewerHeight};
HDC hdcSurface;
HRESULT hr = lpdds->GetDC(&hdcSurface);
if (FAILED(hr))
return;
SetMapMode(hdcSurface, MM_TEXT);
OleDraw(this->mFlashCtrl, DVASPECT_CONTENT, hdcSurface, &rect);
lpdds->ReleaseDC(hdcSurface);
}
When debugging - the console displays two First-chance exceptions as soon as AtlAxAttachControl() is called... Both are 0x8001010D: An outgoing call cannot be made since the application is dispatching an input-syncronous call.
This problem is totally driving me crazy... PLEASE SOMEONE HELP.
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How to create new object in C# for reading COM port.
I am having 'Comet.xyz' object. this object comes from COM port.
please tell me how can i convert following code into c#.
/////////code in delphi
Coment := CreateOleObject('Comet.xyz');
Coment.COmPort="COM1";
please convert it into C#
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You can make a reference to the object...
If not then you can use "Late Binding",...
Type type = Type.GetTypeFromProgID("WScript.Shell");
Object oShell = Activator.CreateInstance(type);
Object[] oArgs = {"notepad.exe"};
type.InvokeMember("Run", System.Reflection.BindingFlags.InvokeMethod, Type.DefaultBinder, oShell, oArgs);
I'm not home in C#, but in VB.Net with "Option Strict Off" you can also just write
Dim type As Type = Type.GetTypeFromProgID("WScript.Shell")
Dim oShell As Object = Activator.CreateInstance(type)
oShell.Run "notepad.exe"
GTH
It feels good to learn and achieve
modified on Thursday, April 9, 2009 5:58 PM
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Just like add-in express, do we have another development tool??
I need to add 2 buttons in microsoft outlook express...
Can someone redirect me to relevant sites,articles etc..
Thanks.
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Hi Guys,
I am trying to round the value of long value. But i have this value in data type Variant.BSTR.
I can convert to this value by changing its data type from BSTR to VT_I4 through VariantChangeType(), in this conversion this value will be get rounded to nearst integer.
Again i should convert this value from VT_I4 to BSTR by VariantChangeType().
This is working fine for ODD numbers but failing for EVEN numbers.
if(FAILED(VariantChangeType(&vtValue,&vtValue,VARIANT_NOVALUEPROP,VT_I4)))
{
ASSERT(false);
}
if(FAILED(VariantChangeType(&vtValue,&vtValue,VARIANT_NOVALUEPROP,VT_BSTR)))
{
ASSERT(false);
}
Ex: if vt.BSTR = "5.5"
after conversion to VT_I4 its value will be 6
But
if vt.BSTR = "6.5" My expected value is 7 here
but after conversion to VT_I4 its value will be 6 only.....any idea please...need to set anything while using this api...
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For me it is crashing when I am changing BSTR to VT_I4 with change type , can you please give me the solution if you found?
My code looks like:
varValue.ChangeType(VT_I4); //_variant_t varValue is BSTR
where varValue is BSTR type and it is null, how can we change in this situation?
modified 17-Jun-19 8:59am.
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Hi,
I need to use the System.Printing.Activation dll bu I'm unabled to find it in the .NET Framework 3.5
I was searching on the net but I can't find it and I saw no other case like mine. Did somebody have tehe same problem I have.
Please help me.
Regards.
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I Just found an answer to my question. The reference i was searching is include into the ReachFramework.dll
apologies
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Hi,
I have a VB code (ActiveX ExE) which has a VB form called DocX.
This form has a GET property (name it retProp) which returns an object.
I have compiled the ActiveX EXE and later used tlbimp from dotnet to generate an Interop.MyProject.dll
Later I have included this dll as a reference in my C# project.
Now I am getting the namespace MyProject.MyInterface.
When I use the following code it says "true"
if (MyInterface.Windows.Exist(ref data) == true)
--> MyInterface.Windows.Exist(ref data) returns the MyInterface.Windows.Window as object
Because MyInterface.Windows.getItem(ref data).Form is returned as an object to me I am not able to Unbox it. I get an error :
System.InvalidCastException: Unable to cast COM object of type 'System.__ComObject' to class type 'VB.Form'. COM components that enter the CLR and do not support IProvideClassInfo or that do not have any interop assembly registered will be wrapped in the __ComObject type. Instances of this type cannot be cast to any other class; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.
Pls help.
Regards,
tvks
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I want display a black background page in a IWebBrowser2. But it always flicker when it is refresh.
So I write following code to fix it.
::SetWindowLong(m_hBrowWnd, GWL_WNDPROC, (LONG)MyBrowWndProc);
m_pBrowWndProc=(WNDPROC)::SetWindowLong(m_hBrowWnd, GWL_WNDPROC, (LONG)MyBrowWndProc);
LRESULT CALLBACK CDlgTest::MyBrowWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
CDlgTest* pThis=(CDlgTest*)g_pIeTestDialog;
if(!pThis)
return FALSE;
if(message == WM_ERASEBKGND)
{
return NULL;
}
return CallWindowProc(pThis->m_pBrowWndProc, hWnd, message, wParam, lParam);
}
It work well at IE 8, but crash at once at IE 6.
Who can help me?
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Will I be able to address all the requirements with a free threaded model? Assuming I have an efficient synchronization mechanism in place. Single,Multi apartments can ever be avoided?
----------------------------
286? WOWW!
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_8086 wrote: Will I be able to address all the requirements with a free threaded model?
Ummm, what requirements?
_8086 wrote: Single,Multi apartments can ever be avoided?
A COM server resides in either a Single Threaded Apartment or a MultiThreaded Apartment. To avoid the use of them you should not use COM at all....
I guess you have to clarify your question (a lot, probably).
"It's supposed to be hard, otherwise anybody could do it!" - selfquote "High speed never compensates for wrong direction!" - unknown
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What about Free-Threaded model? Which is analogous to a background thread? Free-Threaded model is Multi-threaded model?
----------------------------
286? WOWW!
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Ok let me try to explain better.
I write a COM component that runs multiple threads inside. A simple CreateThread used.
I use critical sections to protect objects inside the thread function. What is this model called? I think this is free threaded model.
Also, when I read about STAs they say it deals with UI messages. It makes me tried. After all these brain squeezing efforts to understand COM, when I felt I'm okay with the concepts, a thunder on the head again. What the frack UI messages have got to do with a COM component. I know the dumbness is on my side, but I really don't understand. May be they are talking about Active-x? Understanding this threading models looks like nightmare. If you can help me with a casual explanation. I'd be grateful.
----------------------------
286? WOWW!
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Okay.
So how about starting with the articles here at CP?
Lim Bio Liong has written a nice article series that can be found here[^].
There's a lot to be learned about COM and especially the understanding of the concept of apartments.
In short it boils down to that a thread that creates a COM server must always pump messages; it has to do with marshalling and RPC (deep technical stuff).
Free-threading looks a little bit different depending on whether the server is an in-process or an out-of-process server. But in both cases it means that the server will be called in different thread contexts and thus thread synchronization is essential inside the server. To use free-threading you have to create the server inside an MTA. Creating the server inside an STA guarantees that the server will nly be called from the same thread context as long as you obey the COM rules and marshal interfaces properly across apartment boundaries.
"It's supposed to be hard, otherwise anybody could do it!" - selfquote "High speed never compensates for wrong direction!" - unknown
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Understanding threads inside COM looks like a litmus test for my IQ. Anyway lemme give a try . I will go through those articles your pointed out. Also thanks for the explanations.
----------------------------
286? WOWW!
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Hi,
At first, we insert an object, a .mp3 file, in a Word .doc file footer.
And then insert a Windows Media Player object in it,too.
How to set the URL property of this WMP object in order that we can play this embeded .mp3?
Thank you in advance.
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I'm looking for good, useful resources, both recipe-style step-by-step instructions as well as deep examinations of how one builds .NET assemblies for use in COM/ActiveX environments. Links to articles and web sites that are accessible from behind a well-protected corporate firewall would be most desirable; also, I'd like to hear about books that you yourself have used extensively for this purpose. My languages of preference are VB or C#, as my business environment is not C++-friendly. Thanks in advance for your help with this.
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