How to link win32 dll to project?

Hi
Im working on QT4 with Eclipse IDE. My project needs some win32 declarations (e.g. DWORD, PSP_DEVICE_INTERFACE_DETAIL_DATA) which are included in setupapi.h and setupapi.dll.
With .h header there is no problem, but how to link setupapi.dll to project?

I tried to set file: proj_name.pro

Code:

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LIBS += -LC:\Windows\System32 -lsetupapi

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but it doesen't work.

If you are not working with cl.exe (the MS compiler) will have to use the specific compiler version setupapi.dll.
If you are using MinGW, you should give the path to the MinGW system lib folder (and make sure you have the lib in there)

Thank You for reply.
I'm using MinGW. I added the path "C:\MinGW\lib" as you said. There is no setupapi.dll but I can find there libsetupapi.a. Is that library similar to setupapi.dll?
Anyway, i still can't compile my project with the same errors. Should I modify my proj_name.pro file?

what is the error you get?

I have some structures, used for detecting USB Devices (but its not the point):

Code:

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class USBdevices {
            DWORD propertyBufferSize = 0;
	    char *propertyBuffer = NULL;
	    SP_DEVINFO_DATA deviceInfoData;
 
	    HMODULE hHidLib;
	    HDEVINFO deviceInfoSet;
	    SP_INTERFACE_DEVICE_DATA deviceInterfaceData;
	    DWORD  memberIndex = 0;
	    GUID classGuid;
	    PSP_DEVICE_INTERFACE_DETAIL_DATA deviceInterfaceDetailData = NULL;
	    DWORD requiredSize = 0;
	    DWORD deviceInterfaceDetailDataSize = 0;
 
}

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here are the error log:

Code:

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USBdebives.h:27:33: error: ISO C++ forbids initialization of member 'propertyBufferSize'
USBdebives.h:27:33: error: making 'propertyBufferSize' static
USBdebives.h:27:33: error: ISO C++ forbids in-class initialization of non-const static member 'propertyBufferSize'
USBdebives.h:28:29: error: ISO C++ forbids initialization of member 'propertyBuffer'
USBdebives.h:28:29: error: making 'propertyBuffer' static

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If I do something like that, everythings work fine. But I don't wanna heve variables declarations in constructor or in class method.

Code:

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USBdevices::USBdevices() //constructor
{
         QLibrary("setupapi.dll").load(); // adding necessary library
         //and now declarations of all my variables and structs:
 
            DWORD propertyBufferSize = 0;
	    char *propertyBuffer = NULL;
	    SP_DEVINFO_DATA deviceInfoData;
 
	    HMODULE hHidLib;
	    HDEVINFO deviceInfoSet;
	    SP_INTERFACE_DEVICE_DATA deviceInterfaceData;
	    DWORD  memberIndex = 0;
	    GUID classGuid;
	    PSP_DEVICE_INTERFACE_DETAIL_DATA deviceInterfaceDetailData = NULL;
	    DWORD requiredSize = 0;
	    DWORD deviceInterfaceDetailDataSize = 0;
 
 
 
}

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Your problem has nothing to do with libsetupapi, you have basic compilation errors.
The errors also state what the problem is - you are not allowed to initialize members at the deceleration - you should initialize them in class implementation.
You should first learn basic C++ syntax.

sorry. thats the case when you learn java before C++;

There are Qt java bindings...