C / C++ / MFC

Re: Zoom image on mouse position

12-Mar-21 1:28

Gopi Nath wrote:
what i am doing wrong?

Probably mixing GDI and GDI+; you should only use one of these, preferably GDI+. Zooming an image is quite simple in GDI+ as you just need to specify the target rectangle's position and size.

Gopi Nath14-Mar-21 20:34

Gopi Nath

14-Mar-21 20:34

Thank you Richard, tried with GDI+ only with some changes, now, i am able to get the required output.

Regards,
Gopinath.

Select TRACE functions based on both a variable and a #define?

arnold_w11-Mar-21 5:31

Re: Select TRACE functions based on both a variable and a #define?

11-Mar-21 5:31

I'm working on an embedded ARM-project (STM32F) and I'm programming in C programming language and compiling with Eclipse/GCC. In the project there is TRACE functionality implemented that, if enabled, logs various things over UART using queues and DMA:

C++

#define TRACE(grp, lvl, ...) traceToPrintStream(grp, __FILE__, __FUNCTION__, __LINE__, lvl, __VA_ARGS__)

It can be used, e.g. like this:

C++

TRACE("regCallbacks", T_D, "The user pressed the button");
TRACE("regCallbacks", T_D, "Write to reg %d. First written byte: 0x%X", regAddr, regValues[0]);

I need a different trace that is not queued, does not use DMA and does not include the file name, function name and line number, but the other persons in this project do not agree to throw out the existing TRACE, so I need to make something in parallel. I want to be able to enable my TRACE in two ways, either by #defines:

C++

#define ENABLE_USER_EVENTS_LOGGING
#define ENABLE_COMMUNICATOIN_BUS_LOGGING

or by setting a varible during runtime:

C++

Bool_t enableCommunicationBusLogging;
Bool_t enableUserEventsLogging;

I need a different grouping (the grp parameter) than the others, so the example TRACEings above would have to be augmented with my grouping as well:

C++

TRACE_EX("regCallbacks", USER_EVENTS, T_D, "The user pressed the button");
TRACE_EX("regCallbacks", COMMUNICATION_BUS, T_D, "Write to reg %d. First written byte: 0x%X", regAddr, regValues[0]);

The rules I would like to apply are:
1. If my TRACE is enabled using the macros (hardcode enabled), then the other TRACE can not be used (hardcode disabled).
2. If my TRACE is not enabled using the macros, then both TRACEs can be enabled/disabled during runtime independently of each other. However, they are enabled per groups!

Does anybody know how I can solve this? I found a great website (C Preprocessor tricks, tips, and idioms · pfultz2/Cloak Wiki · GitHub[^]) that shows some really neat macro-tricks, but I'm not sure how to apply it my case.

Richard MacCutchan11-Mar-21 6:11

Re: Select TRACE functions based on both a variable and a #define?

11-Mar-21 6:11

As I understand it (assuming the traceToPrintStream function is fixed) you need a slightly different macro for your TRACE_EX, something like:

C++

#define TRACE_EX(grp, lvl, ...) traceToPrintStream(grp, "", "", 0, lvl, __VA_ARGS__)

If you want to enable the traces at runtime then you need them always enabled at compile time, otherwise you will need to rebuild the code every time. So to allow the traces to be based on switches you need something like:

C++

#define TRACE_EX(switch, grp, lvl, ...) \
if (switch) \
{ \
    traceToPrintStream(grp, "", "", 0, lvl, __VA_ARGS) \
}

where switch is the name of the boolean that controls the tracing.

arnold_w11-Mar-21 7:07

Re: Select TRACE functions based on both a variable and a #define?

11-Mar-21 7:07

Ok, so this is what I have now:

C++

#define USER_EVENTS_LOGGING          0x00000001
#define COMMUNICATOIN_BUS_LOGGING    0x00000002
uint32_t enabledMyGrpBitFlags = 0;

#if defined(ENABLE_USER_EVENTS_LOGGING)
#define TRACE_EX(grp, myGrp, lvl, ...)   if (myGrp & USER_EVENTS_LOGGING)       printf_(__VA_ARGS__)
#elif defined(ENABLE_COMMUNICATOIN_BUS_LOGGING)
#define TRACE_EX(grp, myGrp, lvl, ...)   if (myGrp & COMMUNICATOIN_BUS_LOGGING) printf_(__VA_ARGS__)
#else
#define TRACE_EX(grp, myGrp, lvl, ...)                                                 \
	do {                                                                               \
		if (myGrp & enabledMyGrpBitFlags) {                                            \
			printf_(__VA_ARGS__);                                                      \
		}                                                                              \
		traceToPrintStream(grp, __FILE__, __FUNCTION__, __LINE__, lvl, __VA_ARGS__);   \
    } while (0)
#endif

Is it possible to remove the run-time checks:

C++

if (myGrp & USER_EVENTS_LOGGING) 
if (myGrp & COMMUNICATOIN_BUS_LOGGING)

so that the TRACE_EX macro would become empty when the myGrop isn't matching? In other words, let's say only ENABLE_USER_EVENTS_LOGGING (not ENABLE_COMMUNICATOIN_BUS_LOGGING) is defined, then I would like the following line to "disappear" after the preprocessor is finished:

C++

TRACE_EX("regCallbacks", COMMUNICATION_BUS, T_D, "Write to reg %d. First written byte: 0x%X", regAddr, regValues[0]);

Is that possible somehow?

Richard MacCutchan11-Mar-21 23:11

Re: Select TRACE functions based on both a variable and a #define?

11-Mar-21 23:11

The run time checks are only effective at the time the code runs, so there is no way that the macro can be changed at that point. And the macro itself is evaluated, and its code generated in the preprocessor, long before the code is running.

arnold_w12-Mar-21 0:54

Re: Select TRACE functions based on both a variable and a #define?

12-Mar-21 0:54

I want to be able to compile in 2 different modes:

1. Normal mode: The 2 types of TRACE can be enabled/disabled during runtime independently of each other.
2. Hardcoded my TRACE only mode: Only my TRACE is enabled (1 or more myGrp TRACE groups), it's impossible to enable/disable anything TRACE related during runtime.

So, when compiling in mode 2 above, it should be possible for the macro to evaluate the passed myGrp parameter to determine how the TRACE_EX should be expanded. So if we only enable

C++

#define ENABLE_USER_EVENTS_LOGGING

then the preprocessor should be able to determine that this line should be removed:

C++

TRACE_EX("regCallbacks", COMMUNICATION_BUS, T_D, "Write to reg %d. First written byte: 0x%X", regAddr, regValues[0]);

Richard MacCutchan12-Mar-21 1:22

Re: Select TRACE functions based on both a variable and a #define?

12-Mar-21 1:22

I have tried what I think you are asking for but the preprocessor rejects it. As far as I know you can only do it the way I already suggested.

arnold_w12-Mar-21 1:51

Re: Select TRACE functions based on both a variable and a #define?

12-Mar-21 1:51

On the following webpage C Preprocessor tricks, tips, and idioms · pfultz2/Cloak Wiki · GitHub[^] it is shown how an IIF (immediate if) statement for macros can be implemented. But as soon as I pass an expression, as oppose to either 0 or 1, to it, I can't get it to compile either:

C++

#define USER_EVENTS_LOGGING          0x00000001
#define COMMUNICATION_BUS_LOGGING    0x00000002

#if defined(ENABLE_USER_EVENTS_LOGGING) && defined(ENABLE_COMMUNICATION_BUS_LOGGING)
#define HARDCODE_ENABLED_MY_GRP_BIT_FLAGS      (USER_EVENTS_LOGGING | COMMUNICATION_BUS_LOGGING)
#elif !defined(ENABLE_USER_EVENTS_LOGGING) && defined(ENABLE_COMMUNICATION_BUS_LOGGING)
#define HARDCODE_ENABLED_MY_GRP_BIT_FLAGS      (COMMUNICATION_BUS_LOGGING)
#elif defined(ENABLE_USER_EVENTS_LOGGING) && !defined(ENABLE_COMMUNICATION_BUS_LOGGING)
#define HARDCODE_ENABLED_MY_GRP_BIT_FLAGS      (USER_EVENTS_LOGGING)
#else
#define HARDCODE_ENABLED_MY_GRP_BIT_FLAGS      (0)
#endif

IIF(1)(true, false)                                                               // Compiles fine
IIF((0 < (HARDCODE_ENABLED_MY_GRP_BIT_FLAGS & USER_EVENTS_LOGGING)))(true, false) // Doesn't compile!

Richard MacCutchan12-Mar-21 2:43

MFC: CMFCPropertysheet CMFCPropertypage

12-Mar-21 2:43

Sorry, that is something I have never seen before. To be honest I think you are in danger of making things far more difficult than you need. The original spec I suggested where you can generate (or not) the macro that includes a runtime check, is the simplest way of doing it.

Member 1325158810-Mar-21 19:35

Member 13251588

10-Mar-21 19:35

Hi all,
Is there an easy way to save the current CMFCpropertyPage number when closing a CMFCPropertySheet so that it can be reopened on that page. It seems that this is not implemented by default.

Re: MFC: CMFCPropertysheet CMFCPropertypage

Victor Nijegorodov10-Mar-21 20:21

Victor Nijegorodov

10-Mar-21 20:21

Just save the active page index in registry before closing.
Then read it from registry before activating and set the active page.

CMFCToolTipCtrl doen't enter OnPaint when I use it in my self-draw CTreeCtrl

Member 1488267128-Feb-21 15:52

Member 14882671

28-Feb-21 15:52

Non-modal ActiveX Control， a self-draw CMyTreeCtrl is shown on it.
Now, I create a CMFCToolTipCtrl in my CMyTreeCtrl and I want to dynamically change the text color of Tooltip.
I use SetParams in the ToolTip callback function and set new color/text .
However, I can't get new color when the tooltip displayed.
After I debug and found that it can't enter CMFCToolTipCtrl onPaint. If I use invalidate, then the whole ActiveX Control will flash rapidly.
I inherited CMFCToolTipCtrl and found that WM_PAINT cannot be received in PreTranslateMessage.
It can only receive WM_TIMER. Any other functions in afxtooltipctrl.h are not entered when the tooltip is shown.
And CMyTreeCtrl can receive WM_PAINT.

Could you help me find the reasion? Thanks a lot.

Re: CMFCToolTipCtrl doen't enter OnPaint when I use it in my self-draw CTreeCtrl

Randor 4-Mar-21 10:33

Randor

4-Mar-21 10:33

Hi,

Are you creating the CMFCToolTipCtrl with the TTF_SUBCLASS flag[^]? If so then you should be able to capture the NM_CUSTOMDRAW message[^] and check for the CDDS_PREPAINT draw stage. You can use SetTextColor[^] to change the text color from there.

Best Wishes,
-David Delaune

Re: CMFCToolTipCtrl doen't enter OnPaint when I use it in my self-draw CTreeCtrl

Victor Nijegorodov4-Mar-21 20:39

Victor Nijegorodov

4-Mar-21 20:39

Member 14882671 wrote:
I use SetParams in the ToolTip callback function and set new color/text .
However, I can't get new color when the tooltip displayed.
After I debug and found that it can't enter CMFCToolTipCtrl onPaint. If I use invalidate, then the whole ActiveX Control will flash rapidly.
I inherited CMFCToolTipCtrl and found that WM_PAINT cannot be received

There are virtual methods you could use to customize CMFCToolTipCtrl:
CMFCToolTipCtrl Class | Microsoft Docs
and some other OnDraw... methods.

MFC Dialog Based App Scaling Problem

acerunner31626-Feb-21 6:28

acerunner316

26-Feb-21 6:28

I have an old MFC Dialog Based app that was designed in the WinXP and Win7 era. This project is for internal use and no longer in development. In Win10, we have scaling issues with high DPI screens (some controls are small or positions compressed), which is to be expected. However, on standard DPI screens, there have not been any issues until now.

One user reports that the dialog window is correctly sized (fixed sized), but all the controls within the window are scaled up beyond the boundaries of the dialog window and so half the controls are hidden. Display scaling settings in windows is normal (100%). What could be causing this?

RedDk26-Feb-21 7:22

RedDk

26-Feb-21 7:22

How hard could it be for Visual Studio (new or recent or even old versions for that matter) to convert this old MFC Dialog-based application?

If it could convert this old MFC Dialog-based application it will. If it can't then attempting to open it's project files will result in a telling error message which, of course, will be useful to the learned helpers here on CP.

Try posting that message.

acerunner31626-Feb-21 9:03

acerunner316

26-Feb-21 9:03

Can you clarify convert to what?

I can open the project in Visual Studio 2019 without issues after installing the older toolsets. I do need to maintain compatibility with WinXP. There are some computers that are still running WinXP due to old software/hardware compatibility.

I'm not sure if the UI issue is related to MFC. Converting to .NET forms would not be a simple task.

Dave Kreskowiak26-Feb-21 9:53

Dave Kreskowiak

26-Feb-21 9:53

If you have a business process that is still running on Windows XP, you have MUCH BIGGER problems than this MFC code.

The hardware does not last forever, and when (not if!) it fails, then what? What are you going to replace a bad motherboard with? Or this "old hardware"? What happens when that fails? Hardware that old isn't made any more and good luck trying to find someone to fix it.

Modern day machines will not run Windows XP. Hell, nowadays, Windows 10, or a modern equivalent is required!

Your process is teetering on the brink of failure.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak