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Hi,
I am trying to debug a dll project on VC++ 6.0. Dll file is loading dynamically in the executable (Win32 Console Application) by LoadLibrary API and calling functions by using function pointers. How can I debug this DLL file?
Thank you.
Orkun GEDiK
Senior SAP R/3 Basis and Development Consultant
ASTRON
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You can specify a executable to be stared when you want to debug your dll. I don't remember exactly where it was for VC6 but it was somewhere in the project properties.
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Hi Cédric,
I tried that method before, but didn't work. This is because, as I emphasised in the message, "DLL is loading by LoadLibrary API" in executable. Is there any other suggestion?
Thank you.
Orkun GEDiK
Senior SAP R/3 Basis and Development Consultant
ASTRON
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In MSDEV take Build->Start Debug->Attach To Process. You can see the running process, from which u can select the application which loaded ur dll. open the cpp of ur dll and u can insert breakpoint and can debug.
Another way: On Process tab of Task manager right the exe application, which load the dll, and select debug. MsDEV will open, then u can insert break point on ur dll's cpp file and can debug.
AJay
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At the entry point of your DLL include a api call to DebugBreak()
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Thank you. Is there any way to see C code instead of assembly?
Orkun GEDiK
Senior SAP R/3 Basis and Development Consultant
ASTRON
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Do you have the .PDB file generated during the build of the dll otherwise enable generation of debug info which can be for release or debug. Try using a DEebug build if you are struggling.
Try using WinDebug rather than Visual studio, allthough it does have a learning curve.
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Thank you for your precious feedback. Of course, I have PDB file for executable and dll files. By using this file, can I debug dll file in WinDbg? If I can, how to?
Thank you.
Orkun GEDiK
Senior SAP R/3 Basis and Development Consultant
ASTRON
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WinDbg has a symbol search path and a source search path. both of these need to be set up correctly. You can also download symbols for windows DLL's for various OS. You can also specify a debugger for any executable image which will get loaded automatically when the program executes. Very useful for debugging services.
"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options"
create a key called "debugger" with a value like
"C:\Program Files\Debugging Tools for Windows\windbg.exe" -g
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Hi Ajay,
I can't attach to the process, because of dll is calling at the begining of the fork.
Thank you.
Orkun GEDiK
Senior SAP R/3 Basis and Development Consultant
ASTRON
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Hi,
I am trying to plot the wavform of wav file.In my case the wavfile consists of 6112 samples and having 8 bits per sample.byterate is 4395 bytes /s.Roughly it is equal to about 1.39 seconds of sample data.I want to plot this giving time on x axis and the sample amplitude on y axis.
I am not able to normalize such that 6112 samples can be represented on the scale of 0 to 1.39 seconds.Any hints or suggestions are welcome.
Regards,
Mayank
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What exactly is your problem?
To calculate the X (-time) axis of the spectrum from the sample rate and the sample number?
time = samplerate * sampleno
Though I speak with the tongues of men and of angels, and have not money, I am become as a sounding brass, or a tinkling cymbal.
George Orwell, "Keep the Aspidistra Flying", Opening words
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To plot this properly you need to establish the range of values represented by each x-axis pixel and then plot a vertical line. Unless the plot area allows more than one pixel per sample.
struct Plot
{
int y_min;
int y_max;
}
samples_per_xaxis_pixels = number_of_samples / display_width;
Plot * plot_array = new Plot[ display_width / number_of_samples ];
for(int x=0,i=0;x<number_of_samples;i++,x+=samples_per_xaxis_pixels)
{
int y_min = INTMAX;
int y_max = -INTMAX;
for(i=x;i<x+samples_per_xaxis_pixels;x++)
{
plot_array[i].y_min = samples_array[x]<plot_array[i].y_min?samples_array[x]:plot_array[i].y_min;
plot_array[i].y_max = samples_array[x]>plot_array[i].y_max?samples_array[x]:plot_array[i].y_max;
}
}
And then plot it !
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Hi,
Thanks for your reply.Actually in my case the samples=6112(with wach sample amplitude value between 0 and 255) and on x axis i have to represent these 6112 samples in a total of 1.39 seconds.Roughly if i divide x axis into parts of 100 ms then there are 13 such parts in which i have to divide 6112 samples,so if the display_width in the above case comes out to be 13 .
Thanks and Regards,
Mayank
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I am developing an application that saves files as different file types. I am concerned with the .XML. How do you modify the tooltip when the operator hovers his/her mouse over the file if the file type is .XML? The XML document is defaulted to display the type, date modified, and size in the infotip (tooltip). Is there any programming I can do using C++/MFC to modify these contents? I have been told look into using shell scripting, but this application is to be installed on other machines with Windows XP.
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What context is the user hovering over the file in Explorer or in you own application ?
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First I tried to enable and disable menu item's in main frame window like this:
CMenu *m = GetMenu()->GetSubMenu(1);
m->EnableMenuItem(ID_SCHEME_SELMOVE, bEnabled);
m->EnableMenuItem(ID_SCHEME_HAND, bEnabled);
m->EnableMenuItem(ID_SCHEME_SCALEUP, bEnabled);
m->EnableMenuItem(ID_SCHEME_SCALEDOWN, bEnabled);
This code didn't work until I've add this in frame constructor.
CMainFrame::CMainFrame()
{
m_bAutoMenuEnable = FALSE; //disables auto menu enable
}
Now, I can't enable and disable toolbar buttons:
m_wndViewToolBar.GetToolBarCtrl().EnableButton(ID_SCHEME_SELMOVE, b);
m_wndViewToolBar.GetToolBarCtrl().EnableButton(ID_SCHEME_HAND, b);
m_wndViewToolBar.GetToolBarCtrl().EnableButton(ID_SCHEME_SCALEUP, b);
m_wndViewToolBar.GetToolBarCtrl().EnableButton(ID_SCHEME_SCALEDOWN, b);
I think there is should be a mechanism to disable automatic toolbar enable.
What is that mechanism?
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MFC is set up to not require you constantly maintain and update the state of the menu/toolbars.
It asks you how to display the toolbars/menu item through update handlers.
In the "wizard" where you set up a handler for the menu or toolbar, you can also choose to add an update handler that the system will call whenever displaying them.
void CYourView::OnUpdateViewSomeMenuItem(CCmdUI *pCmdUI)
{
// TODO: Add your command update UI handler code here
if (/*Some Condition*/) {
pCmdUI->Enabled(TRUE);
} else {
pCmdUI->Enabled(FALSE);
}
// Also can set the checked state here
if (/*Some Condition*/) {
pCmdUI->SetCheck(TRUE);
}
}
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Can you use the regular MFC command enabling mechanism?
ON_UPDATE_COMMAND_UI(ID_SCHEME_SELMOVE, OnUpdateSchemeSelMove)
...
void CMainFrame::OnUpdateSchemeSelMove(CCmdUI* pCmdUI)
{
pCmdUI->Enable(false);
}Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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Thanks a lot, that was helpful.
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Using DirectShow I have made a program that captures a video stream and writes the data to screen and to disk. Rendering to screen is done by using IVMRWindowlessControl.
Problems occur when the desktop is locked, e.g. by the screensaver. After unlocking, the rendering part of my application is gray. Calling IVMRWindowlessControl:: RepaintVideo refreshes this rendering part but resets the framecounter and the video contents.
Any ideas how to solve this problem?
Best regards,
Peter
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can you get a handle to the window and call InvalidateRect
BOOL InvalidateRect(
HWND hWnd, // handle to window
CONST RECT* lpRect, // rectangle coordinates
BOOL bErase // erase state
);
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Hi, I have a small problem with my ListCtrl.
I noticed when writing code for HDN_ITEMCLICK notify message, that this will be affected only if I click on a far left side. When I click on item label I cant get click notification!!!
Why is this?
I'm using one column with no header and only text, I added LVS_EX_TRACKSELECT | LVS_EX_FULLROWSELECT stayls!
Thanks.
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