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The code below is my original unmanaged C++ code:
//**********************************************
UINT ThreadFunction(LPVOID pParam)
{
DWORD dwWait;
while (TRUE)
{
.
.
//do something
.
.
dwWait = WaitForSingleObject(m_event,1000);
if (dwWait == WAIT_OBJECT_0)
break;
}
return 0;
}
//**********************************************
I want to implement something like this.
Can you help me ?
Thanks in advance,
Camilo.
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Looks like you want to use the ManualResetEvent/AutoResetEvent:
AutoResetEvent *m_wait = new AutoResetEvent( false );
if( m_wait->WaitOne( 1000, <exit-context-true-or-false> ) )
do-this-if-wait-was-signalled;
else
do-this-if-timed-out;
-------
For the above Wait to continue, either the time has to elapse or another thread has to execute the following code:
m_wait->Set();
Check out MSDN help.
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thanks for your help !!! 
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Hi
Why are DataGrids in C++ .NET so slow?
I am creating a dataset, and a data table with a single row, and it takes a couple of seconds to display the initial data in a datagrid, what am i doing wrong?
cheers
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I have also noticed this
on the first instantiation the system runs slow and for every other after the code runs much faster...
wish I could answer this one
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Hi
Why are DataGrids in C++ .NET so slow?
I am creating a dataset, and a data table with a single row, and it takes a couple of seconds to display the initial data in a datagrid, what am i doing wrong?
cheers
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I am from China, so please forgive my poor English.
I've got a terrible question when i try to use [FieldOffset ..] in C# to simulate the function of "union" in C.
this my code:
[StructLayout(LayoutKind.Explicit)]
public struct union
{
[FieldOffset(0)]
public union1 u1;
[FieldOffset(0)]
public union2 u2;
}
public struct union1
{
[MarshalAs (UnmanagedType.ByValArray,SizeConst=2)]
public byte[] arra1;
}
public struct union2
{
[MarshalAs(UnmanagedType.ByValArray,SizeConst=2)]
public byte[] arra2; //when I turn "byte" type to "int", it is OK! Or if i turn both "byte" to "int" in union1 and union2, it is OK too! ???
}
public void testUnion()
{
union u;
}
that is , I want to make a simple union comprising two "byte" Array at the
same offset, it's compiled successfully, but when i run testUnion(), i get a "System.TypeLoadException". What's more strange is that when i turn one or both of the two "byte" Array to "int" Array (or "long"), it just run Ok!
Any help will be deeply appreciated!
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What is the best way to get x-number of bytes of memory into a byte array and back.
Basically I am trying to copy some unmanaged memory into and out of a DirectPlay NetworkPacket. I haven't found a clean (or semi-clean) solution yet.
Any ideas out there?
Thanks!
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Have you tried System.Runtime.InteropServices.Marshal ?
void Copy(
IntPtr source,
unsigned char destination __gc[],
int startIndex,
int length
)
and
void Copy(
unsigned char source __gc[],
int startIndex,
IntPtr destination,
int length
)
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Who can tell me the name of the Subscript 'operator[]' in ManagedC++?
For example the standard C++ assignment operator is 'operator=', but in managed C++ it is 'op_Assign'.
I tried 'op_Subscript', 'op_ArraySubscript' and some others. I need it to access arrays within a class directly (e.g. Classname[i] instead of Classname.Arrayname[i] (member) or Classname.Value(i) (function Value)) just to have a clear source code in complex matrix and vector computations.
Perhaps it is not implemented (yet) in C++ .NET (just like the standard class template). Microsoft did a very bad job here!
Thanks
Elwin
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Hi,
I've created a managed C++ project, so the startup object is the 'Form1' object.
My problem is that I've created a second class called 'Form2' and I want to declare a variable of type 'Form1' within this class (Form2)... Howw can I do this ?
thanks.
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You must add the #include "Form1.h" in stadfx.h and you should work in Form2.cpp where the stdafx.h is included by default.
In this way it works well!!
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I have been looking all over without finding any proper explanation of how to use unmanaged C++ in C# with the help of managed C++. Can anyone please give a simple step by step guide how to create the projects and show what settings to fiddle around with? (Please don't give any links to MSDN, I allready checked them out and it didn't help (sure I might be stupid but not really that stupid..)).
Thank you.
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go to the below url i have tried it and it works fine good luck.
http://www.codeproject.com/csharp/unmanage.asp
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Thank you, but I'm still looking for a proper explanation of how to write wrapper classes in managed C++ for my unmanaged C++ classes. Sorry I didn't tell in the first message.
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moist wrote:
how to write wrapper classes in managed C++ for my unmanaged C++ classes.
Look here[^]
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I have allready seen the so called "Migration Guide" that consists of two parts, which the first one I find completly useless. I am able to write a wrapper class, but still I wonder how you can create three different projects in a solution, one for your unmanaged c++ class that you want to wrap, a second for your managed c++ wrapper class and third a c# project that uses the wrapper class. How to do that is not included in The Migration Guide.
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You mean to tell me that all this is over knowing how to
add projects to a solution?
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Yes.
Let's say that you have some nice C++ classes you implemented some while ago and that you want to use them in your C# project. I can't figure out how to create a new solution from scratch and then create three different projects; one unmanaged for your old C++ classes, a managed C++ project for your wrapper and a third for your C#. I guess the main problem I have is to choose the proper settings for the unmanaged project since there are no such thing as a unmanaged C++ class library. I beleived that this was a trvial task, but I still don't know how to get it working.
Thanks for the replies.
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1. Wrap your unmanaged C/C++ code in a static library.
2. Make a Managed C++ DLL project, with all the Managed C++ wrapper classes. Link with the static library created in 1.
3. Use the DLL created in step 2, in a C# project of your choice.
It will work 100%.
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Hi there,
I am wondering where i can learn Managed C++.NET. I had check out the msdn C++.NET specs. Very hard to learn.
I had no money to buy books.
And there are far too little tutorials on this area in google.
Only see some like Hello World, Sortting algorithm (mostly consoles).
I had no much knowledge in c++ so i can't be looking at application and learn it.
Any help please?
Thanks.
Regards,
Chua Wen Ching :p
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Thanks.
I saw the articles are rated less than 4.. is it risky to read those?
Regards,
Chua Wen Ching :p
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