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Hi friend,
I would like to share several variables between two different processes.
I share a variable between two instances of one application using "#pragma section", I don't know whether I can use "#pragma section" to share variables between two processes or not.
However, please help me how can I share a variable between two different processes?
Thanks in advance.
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If you need to communicate between two different applications, you can have a look at the IPC section[^] on codeproject (IPC=Inter-process communication).
If you want some advice about which technology to use, then you will need to describe what you want to do with more details. Why do you need to share those variables ?
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Hi,
Since I have two applications, the first one is the writer and the second one is the reader and I want to share a memory between them instead of transferring through Messages.
I want to know how to share a memory between these two processes.
Is IPC (Inter-Process Communication) sufficient for me?
Thanks.
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IPC is a generic term regrouping several techniques: sockets, memory-mapped files (shared memory), messages, ...
In your case, what do you want to do exactly ? Is the value of the variable changing ?
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Yes, the data in the variables are changed every 1 second and another application needs to read the recently changed values.
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If the application which should read the data has a message queue (win32 or MFC application for instance), you can use the WM_COPYDATA message. A tutorial here[^]
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Hello,
I am using a CAnimateCtrl to show an animation during some lengthy operations (multiple calls to CreateProcess), but the problem is that my animation does not play, because the thread is obviously stuck with CreateProcess. So I need to run the animation in a seperate thread, but am not sure which is the best and shortest way to do this. Is there any good example how this can be achieved?
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I think you should do it the other way around: as your CAnimateCtrl is part of the UI, it should be processed in the main UI thread. Instead, why don't you run your lenght operation in a separate thread ?
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Hi,
I have tried this, but it doesn't work right. I have mutlitple calls to Createprocess, and the problem is that I have to wait for each processto finish until I can start the next one. This is what my code looks like, and I definitely need to ait for the process to finish. Any idea how the animation can run parallely to this code? Thanks alot:
if (!CreateProcess(
strFullPath.GetBuffer(0),
strCmdLine.GetBuffer(0),
NULL,
NULL,
FALSE,
0,
NULL,
GetPathOnly(strFullPath),
&si,
&pi )
)
{
...
return;
}
DWORD nRet;
MSG msg;
while (nRet = MsgWaitForMultipleObjects(1, &pi.hProcess, FALSE, INFINITE, QS_PAINT | QS_SENDMESSAGE |QS_MOUSEBUTTON ) != WAIT_OBJECT_0)
{
if (nRet == WAIT_OBJECT_0 + 1)
{
while (PeekMessage(&msg, 0, WM_PAINT, WM_PAINT, PM_REMOVE))
{
DispatchMessage( &msg );
}
while (PeekMessage( &msg, 0, WM_MOUSEFIRST, WM_MOUSELAST, PM_REMOVE ));
}
else if (nRet == WAIT_OBJECT_0)
{
break;
}
OnPaint();
}
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Erik wrote: I have tried this, but it doesn't work right.
You have tried what ? Starting a new thread and spawning your processes from within that thread ? It seems not really what you did. If you do that in a separate thread, you don't have to worry about pumping the message queue or repainting or window.
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Hello,
I am facing a strange problem in my c Windows application sigle-threaded, using VS2008 compiler.
errno is used after system calls to identfiy if any error occured. I have placed checks in my code at various places to know if any exception has occured during a flow.
In one of the function, At the beginning of a code block I check for errno occured in previous code block, if errno is zero, the normal flow continues. If errno is non-zero, nothing is done and the function returns with errno.
Now, i found out a strange issue, errno that is initialized to 0 at the start of the function, changes its value to 9 after doing a sprintf call. sprintf call is successfull though. Another strange thing about it is that this happens only when the exe is run as service on Windows Vista. If the same exe is run from Visual Studio debugger, this behavior doesn't happen when exe runs from VS directly in either release or debug mode.
I can not comprehend the behavior, any help will be appreciated.
Thanks.
Gajendra
Gajendra
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No answers at all....Surprising.
Gajendra
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Ok..so nobody knows it....
Gajendra
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Hello,
I am using Vistual Studio 2005, and want to implement a CAnimateCtrl to my dialog-based application. However, I cannot figure out how I can insert a small AVI file as a resource to my project, everything I tried so far fails. What is the right way to add an AVI resource?
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It can use overload to solution this but i want to know can there any
other ways
to resolve this Question because we can assump there have 100 type ,then
we must to code 100 same functions(when you use overloading)
like this
int SetOption(int a)<br />
{<br />
return a+1;<br />
}<br />
<br />
double SetOption(double a)<br />
{<br />
return a+0.1;<br />
}<br />
<br />
float SetOption(float a)<br />
{<br />
return a+5;<br />
}<br />
thank you everybody 
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Hello jeansea,
The answer is templates.
template <typename t="">
T GetValueToIncriment( T Type )
{
if( typeid( Type ) == typeid( int ))
{
return T( 1 );
}
else if( typeid( Type ) == typeid( double ))
{
return T( 0.1 );
}
else if( typeid( Type ) == typeid( float ))
{
return T( 5.0 );
}
return 0;
}
template <typename t="">
T SetOption(T a)
{
return a + GetValueToIncriment( a );
}</typename></typename>
Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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i means if the funtion solution are complete different not
have little same
you ways are not useful
Is if not have the Format like " return a + GetValueToIncriment( a );"
have any way to solve it? 
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jeansea wrote: i means if the funtion solution are complete different not
You mean function body? If function body is different, there is no way other than overloading.
jeansea wrote: have little same
you ways are not useful
Really Sorry. May be due to the fact that you're question was not descriptive enough.
jeansea wrote:
Is if not have the Format like " return a + GetValueToIncriment( a );"
have any way to solve it? Laugh
Nothing else, as per my knowledge.
Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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Sorry
My English is Poor 
I Mean When Caller Type Change the Function Body will Be change also
i just want to know have any best way to solve this situation but
overloading
<br />
#include<iostream><br />
#include<vector><br />
<br />
using namespace std;<br />
<br />
int m_nType = 0x00000000;<br />
<br />
vector<string> m_vVoidName;<br />
<br />
bool VoidRedRole = false;<br />
<br />
<br />
void SetOption(int Type)<br />
{<br />
m_nType|=Type;<br />
}<br />
<br />
void SetOption(string VoidName)<br />
{<br />
m_vVoidName.push_back(VoidName);<br />
}<br />
<br />
void SetOption(bool ToVoid)<br />
{<br />
VoidRedRole = ToVoid;<br />
}<br />
you see it ,the Funtion Body isn't same ,i use overloading to solve
any other ways?
hope this description could help you
thank you all the same;P
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jeansea wrote: I Mean When Caller Type Change the Function Body will Be change also
In that case you need a function body for every different type - there ain't no shortcuts when that's the case...
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
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Hi,
I'm trying to compile CppUnit 1.12.1 on Windows XP. I have VS 2005 (V> 8.0).
I'm getting the following error: (Only one error)
error PRJ0019: A tool returned an error code from "Updating c:\Documents and Settings\sreedevi\My Documents\cppunit-1.12.1\lib\cppunitd_dll.dll" TestPlugInRunner
In the Debug htm file, it says :
Updating c:\Documents and Settings\sreedevi\My Documents\cppunit-1.12.1\lib\cppunitd_dll.dll
The system cannot find the file specified.
Project : error PRJ0019: A tool returned an error code from "Updating c:\Documents and Settings\sreedevi\My Documents\cppunit-1.12.1\lib\cppunitd_dll.dll"
I excluded the VC6 plugins, commented out the code, and solved the other
errors by including the correct version numbers in the libid import statements.
Any idea how I can solve this? Please help, I've been at it for a whole day now.
Thanks,
Sreedevi Jagannath.
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Hello Sreedevi,
The same problem happened to me. Hopefully you have found the solution
by now as it is August, but in case you have not, be sure that your post build activities
(moving a file from the target path to the /lib path) do not have any spaces in the
path.
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Hi,
I have created one dialog in my MFC application.I have added vertical scroll bar to my dialog.I am displaying Images on dialog.Client area of dialog should scroll when I scroll Scroll bar.I am using Visual Studio 2005.
I have added following line to OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) function.
ScrollWindow(0,-CurPos,CRect(0,0,1100,1100));
I am displaying 8 small Images as two rows on my dialog.After one scroll
Window is moving but window is showing some unwanted lines(Actually I am not printing any Images after 8 Images) .Can anyone help me.
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