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Quote: But you do know that this is the C/C++ board and Java would be off topic?
Yeah I know, that is why I didn't asked questions about java. I only made a comparison between the 2 of them.
Quote: However, all you have to do is converting the Algorithm to Java
I know how to use native functions. I missed this part in that article "float factor between 0.0 and 2.0"
Thanks for your help.
modified 10-Jul-18 4:47am.
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So, I did a few tests with that formula for set gamma, and I found out that the range 0.0-2.0 isn't actually good. I gave values between 0.0-0.2 and nothing happened, then I tried some values between 0.3-4.0 and it was working. So there are values OVER 2.0 that are working and the values under 0.3 aren't working at all.
Can it be that the formula isn't actually correct or that the range he gave is wrong? Or maybe he thought that those values are what users may want?
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I suggest to read about Gamma correction - Wikipedia[^] to understand it.
Note also that the default value for Windows is 2.2. Anything far away from that will display weird.
Very low values will simply result in most - if not all - table values to be set to zero. Similar for very high values which will result in 0xFFFF. That means that there is a range of useful Gamma values while all others will be clipped (note the max() and min() calls in the formula).
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Hi sir,
i am working on MFC VC++ and i am very new to MFC application development. kindly please help me.
our application tool have a vertical scrollbar. it's working with the dragging.but not working with the mouse wheel. kindly please let me know what kind of code support have to give for mouse wheel.
i am using the below classes for creating the frame window.
1.class CMainFrame : public CFrameWndEx
{
.......
CMainFrame(); // main SDI frame window
...........
}
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (!CreateToolBar())
{
TRACE0("Failed to create Ribbon bar\n");
return -1; // fail to create
}
if (!m_wndStatusBar.Create(this) )
{
TRACE0("Failed to create status bar\n");
return -1; // fail to create
}
m_wndStatusBar.AddElement(new CMFCRibbonStatusBarPane(ID_STATUSBAR_STATUS, csStatus, TRUE), csStatus);
m_wndStatusBar.AddSeparator();
m_wndStatusBar.AddElement(new CMFCRibbonStatusBarPane(ID_STATUSBAR_VER, csVersion, TRUE), csVersion);
m_wndStatusBar.AddSeparator();
m_wndStatusBar.AddElement(new CMFCRibbonStatusBarPane(ID_STATUSBAR_MEMORY, csMemory, TRUE), csMemory);
m_wndStatusBar.AddSeparator();
m_wndStatusBar.AddElement(new CMFCRibbonStatusBarPane(ID_STATUSBAR_SECURITY, csSecurity, TRUE), csSecurity);
theApp.SetMainFrame(this);
}
kindly please let me know how to handle the mouse wheel messages and what are steps have to follow to enable this.
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The wheel scrolling has to be performed by the window which content should be scrolled by handling the WM_MOUSEWHEEL message | Microsoft Docs[^]. If that window is CWnd based, just override the OnMouseWheel() function.
I can not give more information because you did not give any information about your window. With frame based MFC applications, that are usually the CView derived classes.
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hi sir,
i wrote the code below, the code is hitting whenever my mouse wheel scrolling. but the vertical scroll bar not moving.could you please give me your input please.
Header file:
class CMainFrame : public CFrameWndEx
{
protected: // create from serialization only
CMainFrame();
DECLARE_DYNCREATE(CMainFrame)
public:
afx_msg BOOL OnMouseWheel(UINT nFlags, short zDelta, CPoint pt);
};
source file :
IMPLEMENT_DYNCREATE(CMainFrame, CFrameWndEx)
BEGIN_MESSAGE_MAP(CMainFrame, CFrameWndEx)
ON_WM_MOUSEWHEEL()
END_MESSAGE_MAP()
BOOL CMainFrame::OnMouseWheel(UINT fFlags, short zDelta, CPoint point)
{
TRACE0("in CMainFrame:: OnMouseWheel function");
return CWnd :: OnMouseWheel(fFlags, zDelta, point);
}
here CMainFrame is derived from CFrameWndEx, CFrameWndEx id derived from the CFrameWnd, CFrameWnd class is derived from the CWnd.
could you please help me if did any wrong.
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Member 13903818 wrote: here CMainFrame is derived from CFrameWndEx, CFrameWndEx id derived from the CFrameWnd, CFrameWnd class is derived from the CWnd.
But do your application also have one or more Views (CView/CScrollView/CForView/... derived classes)?
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yes .....
(class CFormView : public CScrollView
class CScrollView : public CView)
in our application we are deriving the class from the CView like below.
class CCommonEDM_AVitarView : public CView
in above derived call i have handled the OnMouseWheel function. but it's not hitting the code while scrolling the mouse wheel.
code :
Header file:
class CCommonEDM_AVitarView : public CView
{
protected: // create from serialization only
CCommonEDM_AVitarView();
DECLARE_DYNCREATE(CCommonEDM_AVitarView)
public:
afx_msg BOOL OnMouseWheel(UINT nFlags, short zDelta, CPoint pt);
};
source file :
IMPLEMENT_DYNCREATE(CCommonEDM_AVitarView, CView)
BEGIN_MESSAGE_MAP(CCommonEDM_AVitarView, CView)
ON_WM_MOUSEWHEEL()
END_MESSAGE_MAP()
BOOL CCommonEDM_AVitarView::OnMouseWheel(UINT fFlags, short zDelta, CPoint point)
{
TRACE0("in CCommonEDM_AVitarView:: OnMouseWheel function");
return CView :: OnMouseWheel(fFlags, zDelta, point);
}
i am not understanding how internal child windows are working with mouse wheel scrolling. but main window is not working..
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The MFC document - view concept is a little bit complicated regarding the parent and child windows and their interaction.
But the message is sent to the control / window that has the focus. If your view contains controls then one of them probably has the focus and gets the message.
It is still unclear to which window your scroll bars belong. If they are for the view: why is your view not CScrollView based? If your view contains a single control: handle the message there.
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Hello sir,
i have written the below code for my each child frame. this class is derived from the CScrollView. my mouse wheel is working fine for each individual window class. but i am trying to implement same support from my main window class.but mouse wheel is not working. could you please give me your valuable inputs.
My intention is instead of writing mouse wheel code for all the child class. if i implement mouse wheel function for my main frame. i would have been worth to all child classes.
my individual window class code :
mouse while is working with below code with below class..
Header file:
class CAboutView : public CFormView
{
-----------
afx_msg BOOL OnMouseWheel(UINT nFlags, short zDelta, CPoint pt);
}
Source file :
BEGIN_MESSAGE_MAP(CAboutView, CFormView)
//ON_WM_MOUSEWHEEL()
END_MESSAGE_MAP()
BOOL CAboutView::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt)
{
return DoMouseWheel(nFlags, zDelta, pt);
}
This is my main frame:
with the below code my mouse wheel not working.
Header file :
class CMainFrame : public CFrameWndEx
{
-----------
afx_msg BOOL OnMouseWheel(UINT nFlags, short zDelta, CPoint pt);
}
Source file :
BEGIN_MESSAGE_MAP(CMainFrame, CFrameWndEx)
ON_WM_MOUSEWHEEL()
END_MESSAGE_MAP()
BOOL CMainFrame::OnMouseWheel(UINT fFlags, short zDelta, CPoint point)
{
CScrollView *wnd = NULL;
BOOL mValue;
mValue = wnd->DoMouseWheel(fFlags, zDelta, point);
return mValue;
}
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I have a CData derived from CObject. In my CDocument, I have a CMap, with key as int, and values as CData*.
In a CMyDocument method I have:
void CMyDocument::GetData(int nItemData, CData* pData)
{
m_MapData.Lookup(nItemData, pData);
TRACE("Inside doc method: pData is not NULL: %d\n", NULL != pData);
}
and in my CMyView:
int nItemData = 1;
CData* pData = NULL;
GetDocument()->GetData(nItemData, pData));
TRACE("In MyView: pData is not NULL: %d\n", NULL != pData);
and here is the result:
Inside doc method: pData is not NULL: 1
In MyView: pData is not NULL: 0
Why inside CMyDocument I have a valid pData, but outside not ?
modified 8-Jul-18 10:17am.
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In case 1 you have not shown the value of pData. In case 2 you have explicitly set its value to NULL.
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In case 1, the trace show me that pData is not NULL, and after GetData call, I set up nothing, I only display if pData is NULL or not ... but is NULL ...
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Your test does not show what you think. It shows the values that you set in pData before the call to GetData, which does not change it. You need to reread the documentation, and understand the difference between a pointer and a reference.
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Because the CData pointer is passed by value. If you need to modify the pointer then you have to pass it by reference (or use a double pointer).
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I used double pointer and goes perfectly. Kindly thank you all of you (including Richard)!
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In VS 2017, is it possible to create a static library project that exports classes the same way an MFC Extension DLL does?
I know I can create a regular static library project, but how would I make it possible to use MFC classes like CString inside that project?
The difficult we do right away...
...the impossible takes slightly longer.
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Thank you for your response!
I just figured out how to do it.
First, create a static library project, then include all of the MFC headers in the stdafx.h file.
Thanks again. 
The difficult we do right away...
...the impossible takes slightly longer.
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Hello everyone,
I'm kinda new to writing application programs for a PC, a Linux one at that, so I hope this isn't a stupid question. 
I am rather experienced at writing C programs for Microchip PICs. I need a PC application to interface with a PIC project, it will up load information to the PIC from the PC using a pair of Wixel modules. They are basically a USB to RF or RF to Serial bridge. I have them working (one connected to the PC, one connected to the PIC) using a terminal program. I can send data back and forth just fine.
I am now trying to send and receive data using a C++ application. The sending from the PC to the PIC works just fine also. The problem I am having is getting data from the PIC to the PC Application.
This is the application code ..
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
int main(int argc, char** argv)
{
fstream COMPORT;
char line[256];
streamsize lim = 256;
char c;
COMPORT.open("/dev/ttyACM0");
while(1)
{
if (COMPORT.is_open())
{
cout << "Hit <Enter> to send command, <S> to Stop .." << endl;
cin.get(c);
if ((c == 's' || c == 'S'))
{
COMPORT.close();
return 0;
}
COMPORT << "UPLOAD NEW MAP\n";
COMPORT.getline(line, lim);
cout << "Line =" << line;
cout << "Response=" << c;
cout << endl;
}
}
COMPORT.close();
return 0;
}
The PIC code, if that helps ..
void APP_Wixel_IO_Test_Tasks(void)
{
APP_ESUART_Tasks();
if (CmdReady == 1)
{
CmdReady = 0;
RXBufCnt = 0;
utoa(TXBuf, Cnt, 10);
strcat(TXBuf, "\n");
WriteESUARTDataMsg(TXBuf, strlen(RXBuf));
Cnt++;
}
}
Basically all the PIC code does is send back the 'cnt' variable when it gets data from the PC.
The
COMPORT.getline(line, lim); doesn't work right. The first time I run it, it kinda works, but resending the data back to the PIC gets no response ..
Hit <Enter> to send command, <S> to Stop ..
Response=4
Hit <Enter> to send command, <S> to Stop ..
Response=
Hit <Enter> to send command, <S> to Stop ..
Response=
Hit <Enter> to send command, <S> to Stop ..
Response=
Hit <Enter> to send command, <S> to Stop ..
I've tried everything I can think of. Like I said, data out
COMPORT << "UPLOAD NEW MAP\n"; works fine. Data in does not.
Thanks
OtG
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WriteESUARTDataMsg(TXBuf, strlen(RXBuf));
Should that not be strlen(TXBuf) ?
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Yes, it should. I changed that but I get the same response from the application ..
Response=�
Hit <Enter> to send command, <S> to Stop ..
Response=
Hit <Enter> to send command, <S> to Stop ..
Response=
Hit <Enter> to send command, <S> to Stop ..
Response=
Hit <Enter> to send command, <S> to Stop ..
^C
RUN FINISHED; Interrupt; real time: 11s; user: 0ms; system: 0ms
I am pretty sure the PIC is doing it's job and replying to the message from the application (PC) correctly.
Thanks for spotting that error.
OdlG
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I have never tried to read a serial port via a stream class. Serial ports tend to be slow, and are really character oriented. You could try just using a basic file handle and reading as many characters as you can, gradually filling a buffer until you see a newline character. I know the ifstream should work that way but ...
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