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Hello Friends,
I have the following lines of code. The CRHPostMessageToParent() calls parent to parent class methods.
AfxMessageBox(_T("Page2::Inside TellPArent"));
this->CRHPostMessageToParent(WM_CHANGED_DS, (int)&deptStock);
this->ShowWindow(SW_HIDE);
this->CRHPostMessageToParent(WM_SHOW_NEXT_VIEW, i);
AfxMessageBox(_T("Page2::Finished TellParent"));
These codes start running untill the previous line code is not completed. I want to ensure, that it should proceed to next line only when the first is completed. The CRHPostMessageToParent() calls PostMessage () to parent & returns void. The parent function OnChanged_DS() returns LRESULT.
In Java, this can be achived by assigning each task in thread and synchronizing it, which makes sure that the process is completed & then only the handle is released.
How do I achive the same in VC++6? I hope I have explained my situation to the best. If yet not, ask me.
Thanks
Terry
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Trupti Mehta wrote: How do I achive the same in VC++6?
You can also use synchronization.
"Love people and use things, not love things and use people." - Unknown
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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You can use MFC sync classes like CMutex,CEvent and CSemaPhore.
Sudhir Kumar
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Does your CRHPostMessageToParent call PostMessage or SendMessage? Using SendMessage means that control does not return until the message has been processed which sounds like what you want.
Judy
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JudyL_FL wrote: Does your CRHPostMessageToParent call PostMessage or SendMessage?
Did you miss:
The CRHPostMessageToParent() calls PostMessage ()...
"Love people and use things, not love things and use people." - Unknown
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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DavidCrow wrote: Did you miss
Yes and no  . Yes, in that I didn't see the exact API function name and read the function description as "post a message." No, in that the function name implies Post instead of Send. More important was to make sure the OP was aware of the difference between PostMessage and SendMessage - unclear from the original post.
Judy
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It calls the PostMessage(message, WPARAM, LPARAM)
How do I achieve the goal? Can you give some guidance/example to work with CEvent etc classes as mentioned in ealier post.
Thanks
Terry
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I'm not the one who mentioned using CEvent. My suggestion was to call SendMessage instead of PostMessage to make the caller wait until the message was processed.
Judy
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Oh sorry Judy. must have read in some website for solution of the problem.
Anyways, I changed from PostMessage to SendMessage. Was just wondering will it make any differnece in using any of those. I mean, i changed from post to send will that make any other impact on the application other than not returning till the message is posted. Am just curious about it.
Thanks Judy.
Thanks
Terry
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Trupti Mehta wrote: Was just wondering will it make any differnece in using any of those. I mean, i changed from post to send will that make any other impact on the application other than not returning till the message is posted.
Nope, that is the only difference. It can become an issue in multi-threaded programs whether you use Post or Send depending on how your GUI thread and your worker threads synchronize with each other. If you use Send, you need to be (even more) careful about potential deadlocks since Send causes your thread to wait.
Judy
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Hi, I have a dialog box with a pop-up menu and one of the menu entry in there has the 'Checked' property set to true (as default). Now during the execution of my program, I would like to un-check the check mark next to this menu item, but I can't seem to be able to accomplish this, the check-mark seems to be there always. Debugging through the code, it seems to execute the correct statements, but the GUI does not seem to get updated. Any help would be greatly apperciated.
VS2005, C++ (MFC)
Code:
CMenu menuTst;
VERIFY(menuTst.LoadMenu(IDR_MENU_HELP));
CMenu* pPopupTest = menuTst.GetSubMenu(0);
UINT state = pPopupTest->GetMenuState(ID_OPEN_LOGFILE, MF_BYCOMMAND);
ASSERT(state != 0xFFFFFFFF);
if (state & MF_CHECKED)
pPopupTest->CheckMenuItem(ID_OPEN_LOGFILE, MF_UNCHECKED | MF_BYCOMMAND);
else
pPopupTest->CheckMenuItem(ID_OPEN_LOGFILE, MF_CHECKED | MF_BYCOMMAND);
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You are loading menu locally in the function that,s why its not affecting the changes.
make CMenu menuTst; member of class and load (VERIFY(menuTst.LoadMenu(IDR_MENU_HELP));) somewhere like initdialog();
Sudhir Kumar
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Hmm..unfortunately making the CMenu variable member of the class didn't seem to work either. I tried adding an ON_UPDATE_COMMAND_UI function for my menu item to try it in there, with no success!
void CTestDialog::OnUpdateOpenLogfile(CCmdUI *pCmdUI)
{
pCmdUI->SetCheck(0);
}
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Hi all!
I wonder if there is a simple and safe way to find out the exact coordinates of the Windows Start Menu Button. I am quite familiar with Visual C++ and MFC and yes, I did look for a solution beforehand^^.
I need a robust solution that gives me the icon coordinates, even if the taskbar position is at the top or the side. I use Windows XP and VS 2005.
Thanks for any helping advice,
Christian
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Try This code:
CWnd* m_Window = CWnd::FindWindow("Shell_TrayWnd","");
CRect rc;
m_Window->GetTopWindow()->GetWindowRect(&rc);
Sudhir Kumar
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Hello Sudhir!
Uhh, what can I say? This is pretty much _exactly_ what I wanted! It even works perfectly if the taskbar is autohiding...
Big thanks to quick and helpful answer!
Christian
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You are welcome.
Sudhir Kumar
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Following is the code of my program...
#include "stdafx.h"
#include "windows.h"
int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
MessageBox(NULL, "This is my first windows program\n Author: Mohsin", "Virtual University", MB_OK|MB_ICONINFORMATION);
}
While building it is throwing following error..
Error 1 error C2664: 'MessageBoxW' : cannot convert parameter 2 from 'const char [49]' to 'LPCWSTR' e:\visual programming\practices\test\test\p_66.cpp 6 test<br />
Mohsin Ali
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It is because UNICODE is defined. If you want a full understanding, a strongly suggest this article[^].
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It happens because the project is built for UNICODE.
Sudhir Kumar
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Then how can I change...
I mean what I have to do in order to remove this error..
Mohsin Ali
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Use generic text mappings instead of using char arrays. This way if you want to enable UNICODE later on, your program will support it.
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Sorry but I will complain about the answering style of some people.
For example in this question it is obvious that he is a newbie and facing a simple problem. But look at the answers to that simple question.
Its because you are in UNICODE...... is this the answer?
Think about the person expecting a solution : so what? What am I supposed to do? Where should I read?
Would not it be better if you answer it in such a way. (like the way toxcct did for example)
It's because of ......, You should try a code like ......, For more info you can read .... web page
At the top of the forum there is a default subject "How to get an answer to your question" and I think there should be another one "HOW TO ANSWER A QUESTION".
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