GPIB in QT
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My compiler is MSCV, Microsoft Visual C++ Compiler 9.0(x86).The .dll comes from the manufacturer is built by .net.I can get them from their website, so they are matched, right? If they are matched. how could I use them in QT ?? I knew method of using "QLibrary", but I want is a whole class in the .dll, not function.By the way, total functions I need are included in class, so I should using the class, aren't !? Thanks for your answer in advance.
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No, the managed .dll can not be accessed by native C++ code directly!
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BTW,If you really want to call managed .dll from native c++ code in the furture, you can ref: http://support.microsoft.com/kb/828736
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Yes, native code is compiled to work directly with the OS, which is not managed by the CLR (Common Language Runtime).
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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 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
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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
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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 ?? -
I've never seen it myself, sorry. Try asking at a Microsoft forum, since it's from Microsoft API.
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[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
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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.
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[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.
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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.
