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Hi,
you should not use Thread.Suspend/Resume, these methods are obsolete now; they serve no real purpose,
you simply can't trust them.
Furthermore Suspend can throw ThreadStateException when "The thread has not been started or is dead" as the documentation tells you; and that is what you are encountering occasionally, due to your peculiar sleep values and other system activities. Take my earlier advise.
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Ok . I'll take your advise, but may I know what happens when a thread is sleeping and we try to suspend it? I think that's the case
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Hi,
I do know several other Operating Systems only offer a SuspendSelf, which is obviously a synchronous operation; suspending another thread is asynchronous in nature, the caller does not know in what state the target thread is, nor how far it will continue before the suspension kicks in. This fundamental problem is why Suspend is now obsolete.
I don't know what exactly happens to a Windows or .NET thread when Suspend gets called; I never used it
since it cannot be trusted anyway.
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I have a legacy C app which uses FFmpeg APIs.
I'm trying to update it, I want to write a UI in C# and keep the core in C.
So, i'm dabbling in C++/CLI for the first time.
It's my understanding that I can create a managed class wrapper, and have managed methods which take managed parameters, convert them as necessary to unmanaged equivalents (with System.Runtime.InteropServices.Marshal methods), do the work in native C, and then convert outputs from unmanaged to managed types for return.
However, I'm stuck at the start. I've created a class like this:-
ref class FFmpegCap
{
public:
FFmpegCap(String^ inputVideo);
protected:
AVFormatContext *m_pFormatContext;
};
In my constructor, i need to call a C FFmpeg function to initialise the library, one of the parameters it requires is of type AVFormatContext ** . So, I call this function as follows:-
if (av_open_input_file(&m_pFormatContext, pInputVideo ,NULL,0,NULL) != 0)
{
}
However, this fails to compile; error C2664: 'av_open_input_file' : cannot convert parameter 1 from 'cli::interior_ptr<type>' to 'AVFormatContext **'
It seems that the & operator is not doing what I expect of it!
Any pointers?
Thanks
Jon
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The thing that confuses me is that &m_pFormatContext should be an unmanaged pointer, therefore AFAIU shouldn't need pinning?
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Your unmanaged pointer is inside a managed object. You need pin_ptr to prevent the unmanaged pointer pointing to different location during the garbage collection.
Have you tried changing to pin_ptr? I believe that should solve the issue.
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I had a similar issue. I read that you have to create the pointer locally in the function then assign it to a member variable afterwards
something like this:
IDiscMaster *dscMaster;
hResult = CoCreateInstance(CLSID_MSDiscMasterObj, 0, CLSCTX_ALL, IID_IDiscMaster, &dscMaster);
if (SUCCEEDED(hResult))
m_pDiscMaster = (IDiscMaster *)dscMaster;
else
return false;
Don't be overcome by evil, but overcome evil with good
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Hey when I abort a thread it throws a ThreadAbortException right?
I catch it, it is re thrown again but the first time I catch it I call the function ResetAbort(), but the thread still aborts 
Help please...
Here's my code
#include "stdafx.h"
using namespace System;
using namespace System::Threading;
ref class MyThread
{
public:
static void ThreadFunc(Object ^Name);
};
void MyThread::ThreadFunc(Object ^Name)
{
Thread ^thr = Thread::CurrentThread;
try
{
for (int i = 0; i < 100; i++)
{
Console::WriteLine("{0} {1}", Name, i.ToString());
Thread::Sleep(10);
}
return;
}
catch (ThreadAbortException^)
{
Console::WriteLine("{0} Aborted", Name);
thr->ResetAbort();
}
}
void main()
{
Console::WriteLine("Main Program Starts");
Thread ^thr1 = gcnew Thread(gcnew ParameterizedThreadStart(&MyThread::ThreadFunc));
Thread ^thr2 = gcnew Thread(gcnew ParameterizedThreadStart(&MyThread::ThreadFunc));
thr1->Start("Thread1");
thr2->Start("Thread2");
Thread::Sleep(20);
thr1->Abort();
Thread::Sleep(40);
thr2->Abort();
Console::WriteLine("Main Program Ends");
}
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I changed like
void MyThread::ThreadFunc(Object ^Name)
{
for (int i = 0; i < 100; i++)
{
Thread ^thr = Thread::CurrentThread;
try
{
Console::WriteLine("{0} {1}", Name, i.ToString());
Thread::Sleep(10);
}
catch (ThreadAbortException^ ex)
{
Console::WriteLine("{0} Aborted", Name);
thr->ResetAbort();
}
}
}You can find out the reason yourself 
modified on Monday, January 12, 2009 8:36 AM
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Why you put it into a loop?
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Following is your code
Thread ^thr = Thread::CurrentThread;
try
{
for (int i = 0; i < 100; i++)
{
Console::WriteLine("{0} {1}", Name, i.ToString());
Thread::Sleep(10);
}
return;
}
catch (ThreadAbortException^)
{
Console::WriteLine("{0} Aborted", Name);
thr->ResetAbort();
}In this, when the thread abort exception is raised, the control will come out of the loop and enter into the catch block. Thread.ResetAbort puts the thread again in running state, but since the loop is finished, there is nothing to execute and the thread will return immediately. This is the reason why your code failed.
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So when an exception is caught, doesn't it return backs to the try block?
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No. After the ResetAbort call, control will come out of catch and execute the next statements. It will not go back to the try.
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Hi~all.
I am using visual 2008 c++ to undergo a project with the window form, my supervisor said that I should embed a 3D animation ,it only need to include a sun, a solar panel and a house in it,my case is that there are some buttons for the user to input the value. When the position of the panel change,the panel in the animation will also change,and for the sun and house ,the sun is just need to move from east to west to simulate a whole day situation.But i don't know whether and how to do it with c++..
Actually i have tried the Dark GDK, but it seems that I need to open another project if i use it and I am not very familiar with it....
Can anyone suggest how I can solve it...thanks..
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My application has UI in C#, and buisness logic in MFC/VC++. The connection between Managed and unmanaged code are provided using ManagedC++. Now I want the events raised from my VC++ class, to be handled or received in ManagedC++ layer.
The question is it possible to do it. If so any reference article/code with be helpful.
Thanks in Advance!
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Hello. Hope all will be fine here.
I am working in .Net 2005. My project is developing a messenger using VC++. All the work has been done almost. What I need more is here:
I have to include web iframe such that:
1. the client wants an web iframe at the bottom of the messenger with a static link to a website.
2: The iframe contains static info and banners.
2: Also if the client is started there should be opened a browser at the backend like a popup.
can anybody give me idea or any helping web link.
Thanks
Azhar Rahi
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use explorer control and assisgn any link to it
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actually one thing I missed. My VC++ code is unmannaged. So how can I do that then ?
I think may be problem is something else?
Azhar Rahi
modified on Sunday, January 11, 2009 4:14 PM
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Hi guys,
I been working on a antivirus project as my final year project.. i have some problem with getting the list of all the files in a directory..
Lets say i choose C:/ and i want the list of all the files in the directory. Kindly help me with this ya... its a console program and i using DavC++ compiler...
Regards,
Thilek
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This is the C++/CLI (Manage C++) forum. You need to ask your question in the C++ / MFC forum.
"We make a living by what we get, we make a life by what we give." --Winston Churchill
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I want to Invoke a Web Service using Visual C++ .NET. Please provide me with information.
I have sample code to invoke web service using c#. The web service method has complex data as input. Please reply.
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If you have sample code, why not convert it to C++/CLI?
Or just use C#?
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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Here[^] and here[^] as well, pick a forum and stick to it!!!
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ok.fine. Tell me how to invoke web service using managed c++ (in .NET 2003/2005)
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