GPIB in QT

[dbzhang800]

Yes, native code is compiled to work directly with the OS, which is not managed by the CLR (Common Language Runtime).

[Ivan1120]

http://en.wikipedia.org/wiki/Managed_code
Look above link, C++ also can be manage code, so C++ can be managed code(C++ in .net) and unmanaged code(Native C++), right !? It depends on which environment developer to use.

[dbzhang800]

[quote author="Ivan1120" date="1374561273"]http://en.wikipedia.org/wiki/Managed_code
Look above link, C++ also can be manage code, so C++ can be managed code(C++ in .net) and unmanaged code(Native C++), right !? It depends on which environment developer to use. [/quote]

Yes, it is depending the options you passed to the msvc c++ compiler. take a simple c++ application for example:

@
#include <iostream>

int main()
{
std::cout<<"Hello From MSVC"<<std::endl;
return 0;
}
@

It can be compiled as native code

@
cl a.cpp
@

or compiled as managed code

@
cl /clr a.cpp
@

But in Qt world, only native C++ code make sense at present.

---

BTW, you should use the native c/c++ api provided by your device manipulater

[Ivan1120]

I have one more question, I tried the direction you gave me from below link:

http://support.microsoft.com/kb/828736

In the article, the step 9 of "Call the Managed DLL from Native C++ Code",
@// Initialize COM.
HRESULT hr = CoInitialize(NULL);

// Create the interface pointer.
ICalculatorPtr pICalc(__uuidof(ManagedClass));

long lResult = 0;

// Call the Add method.
pICalc->Add(5, 10, &lResult);

wprintf(L"The result is %d", lResult);

// Uninitialize COM.
CoUninitialize();
return 0;@
What is "ICalculatorPtr"?? The .dll I built from above link, ICalculator is interface, my question is if I want to use .dll from device manufacturer provided, their .dll file should be written from interface ??

[Ivan1120]

Does anybody know!?

[JKSH]

Try http://social.msdn.microsoft.com/Forums/vstudio/en-US/217608ea-e499-458a-af36-2dcffd36b323/microsoft-howto-does-not-work-how-to-call-a-managed-dll-from-native-visual-c-code-in-visual

[Ivan1120]

Thanks, my code can work well.But I want to know what is “ICalculatorPtr”, I didn't see any definition of it. Because if I use this method in the future, this would be a important issue. Thanks in advance.

[JKSH]

I've never seen it myself, sorry. Try asking at a Microsoft forum, since it's from Microsoft API.

[Ivan1120]

Thank you:)). If I can't get answer here, maybe I'll go to ask in Microsoft forum.Does any body know what is “ICalculatorPtr” and how does it generate??

[dbzhang800]

[quote author="Ivan1120" date="1374589946"]Thanks, my code can work well.But I want to know what is “ICalculatorPtr”, I didn't see any definition of it. Because if I use this method in the future, this would be a important issue. Thanks in advance.[/quote]

It's a typedef of smart pointer _com_ptr_t

http://msdn.microsoft.com/en-us/library/8etzzkb6(v=vs.71).aspx

[Ivan1120]

Thanks:)), Something I'm confused still, according to released document from Microsoft , if I want to use .dll file with managed code in native c++ environment, like "QT", does class in the .dll should be designed to inherit "Interface"?? like following link.

http://support.microsoft.com/kb/828736/en-us

[Ivan1120]

Hi, everyone. Does anybody know above question!?

[JKSH]

[quote author="Ivan1120" date="1374801537"]Hi, everyone. Does anybody know above question!?[/quote]This is a Qt forum, so not everyone here has experience with the .NET framework (some people here don't even use Windows). Try asking at a Microsoft forum.

[Ivan1120]

I see, thank you.

[overtheocean]

I developed a set of library/ driver to communicate with Spectrum analyzer, dc supplier, PNA thru GPIB or USB using only Qt.

works very well, use it from a main program using .dll

M.