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Hi all. I have a doubt: how ulSize data buffer size should be:
CString sValue;
ULONG ulSize = _MAX_PATH;
lRet = RegQueryValueEx(hKey, NULL, NULL, NULL, (BYTE*)sValue.GetBuffer(_MAX_PATH), &ulSize);
sValue.ReleaseBuffer();
or
CString sValue;
ULONG ulSize = _MAX_PATH * sizeof(TCHAR);
lRet = RegQueryValueEx(hKey, NULL, NULL, NULL, (BYTE*)sValue.GetBuffer(_MAX_PATH), &ulSize);
sValue.ReleaseBuffer();
I guess that ulSize should be _MAX_PATH * sizeof(TCHAR); like in the second code ... but I am not sure ... can you tell me how is right ?
Thank you.
modified 8-Apr-15 5:37am.
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From MSDN RegQueryValueEx function[^]:
Quote: lpcbData [in, out, optional]
A pointer to a variable that specifies the size of the buffer pointed to by the lpData parameter, in bytes.
So it must be the second version.
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hey.....i have searched alot about c graphics and till now don't get any helpful information.
so i want to know some sites which can provide data about c graphics...basically i want to learn this....so do me a favor 
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Do yourself a favour and study the documentation[^]. Google will find you some alternatives.
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The C programming language doesn't provide, by itself, functions for graphics. You have to use, in your application, the graphics API your system provides.
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As pointed out, C and C++ do not (yet) have built-in graphics capabilities. There are plenty of libraries for that purpose however, and plenty of articles offering advice on how to use them. What library to use strongly depends on the purpose you have in mind. I therfore suggest you feed the search engines of your choice with the keywords, "C", "Graphics programming" and maybe a keyword or two describing the application you have in mind.
GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)
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Because it is difficult and wastes time for modifying the controls position in xml file directly.
Is anyone know how to design a good one as visual studio that cat drag and drop controls?
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yu-jian wrote: Is anyone know how to design a good one as visual studio that cat drag and drop controls?
Yes, I'm sure someone out there has the ability.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Hi all,
First of all, I would like to apologize for posting this question in the C++ forum as it deals with Classic VB (VBA) ... The reason I posted here is because I can't get an answer (not even a hint) in the VB/VBA foums ... I searched the web extensively but without any luck
I hope you guys can ,at least, point me in the right direction
Problem:
I am trying to control the Undo/Redo Stack in excel but I can't seem to get a pointer to the UndoManager Interface in the ppv out argument when calling the QueryService Method .. it always returns Nothing ..
I hope someone can tell me what I am doing wrong .. I think the "SID_SApplicationObject" is not the right SID for what I am trying to achieve
Note : I am using the olelib.tlb
Code :
Sub Test()
Dim pUnk As olelib.IUnknown
Dim IServiceProvider As olelib.IServiceProvider
Dim IID_IServiceProvider As olelib.UUID
Dim IID_IOleUndoManager As olelib.UUID
Dim SID_SApplicationObject As olelib.UUID
Dim ppv As IUnknown
CLSIDFromString IIDSTR_IServiceProvider, IID_IServiceProvider
CLSIDFromString "{0C539790-12E4-11CF-B661-00AA004CD6D8}", SID_SApplicationObject
Set pUnk = Excel.Application
pUnk.QueryInterface IID_IServiceProvider, IServiceProvider
IServiceProvider.QueryService SID_SApplicationObject, IID_IOleUndoManager, ppv
End Sub
Any help will be much appreciated
Regards.
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jaafar tribak wrote: First of all, I would like to apologize for posting this question in the C++ forum as it deals with Classic VB (VBA) ... The reason I posted here is because I can't get an answer (not even a hint) in the VB/VBA foums ... I searched the web extensively but without any luck
I do not see where you've asked this question in the VB forum.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Hi,
I did ask similar questions in the VB and COM forums before and in other websites as well .. but these rather difficult questions often remain ignored or without a propper solution .. I thought VC programmers were more confortable with these type of in depth subjects.
The very few vb lines in the above code snippet should be easy to understand by non vb programmers .. I hope that anyone fmiliar with ole/com would hopefully be able to give me (at least) a rough hint
Regards.
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I am starting my application by a Service. Now When I want to save a
file, I tried using CFileDialog. but when ever I select "desktop" it
prompts a message as "C:Windows\system32\config\systemprofile\desktop"
refers to location that iss unavailable. It could be hard drive on this
computer, or on a network... "
I checked that "C:Windows\system32\config\systemprofile" is available
but there is not desktop directory inside it.
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Sorry I didnt knw abt this
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Hi,
I'm integrating some some WPF controls into a MFC dialog box.
One of the control is a media player that shows live video.
The second one is a label that shows the current video time.
What I need is to have is the label on top of the media player. The label should only display the time, so its background needs to be transparent.
Right now, I have the video player running fine inside the dialog box, but I am unable to have the time displayed as I wish. It just overlap the video player.
Both WPF components were creating by following instructions from this link.
https://msdn.microsoft.com/en-us/library/ms742522(v=vs.110).aspx#hosting_a_wpf_page[^]
I try to set the label with a transparent background.
timeLabel->Background = gcnew System::Windows::Media::SolidColorBrush (System::Windows::Media::Colors::Transparent);
But the label background is shown black.
I also try to set the Transparent flag of the MFC CDialog to true, but it didn't have any effect.
How can I that fixed?
Do I need to set up something special when I instantiate the WPF controls?
Do I need to call some functions from inside the MFC dialog box?
Thanks,
Alain Migeon
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Member 8833981 wrote: I try to set the label with a transparent background.
timeLabel->Background = gcnew System::Windows::Media::SolidColorBrushSystem::Windows::Media::Colors::Transparent);
This looks like Managed code. Might try the other forum.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Thanks for suggestion.
I have just done so. But I'm not sure that the answer to my problem is inside the WPF part.
It can also be in the MFC one.
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Hi,
I want to download file from a given URL. I am using URLDownloadToFile() function for this purpose, but I am not getting the actual file. When I try to run the file, it throws an error.
As an example, If I download MSVS 2010 service pack 1 from Microsoft's website, the file size will be 795KB. But if I download using URLDownloadToFile() function passing the url and file name, downloaded file size will be 99 KB.
Is there any method to download an exe from a URL in C++.
Any help wll be appreciated.
Regards,
mbatra
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Which URL?
You must pass the complete URL to the file. When browsing MS for downloads, they are often provided by a confirmation page that will start the download. If you pass that URL, wou will download the web page content. On such pages you will usually find a link to the real file if the download does not start after some time.
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Hi Jochen,
Thanks for your response. I got the code working. I was passing the link of the confirmation page, that was the issue.
Thanks..!!
Regards,
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