QT with USB

[youfulan2015]

HI ,guys
I get job last week;the Manager want me to transplant a vc6 project into Qt;
I got all the codes;
but here is a question I come across:
in vc6 we can send a control message to a usb device by function "DeviceIoControl" in MSDN:
DeviceIoControl
The DeviceIoControl function sends a control code directly to a specified device driver, causing the corresponding device to perform the corresponding operation.

BOOL DeviceIoControl(
HANDLE hDevice, // handle to device
DWORD dwIoControlCode, // operation
LPVOID lpInBuffer, // input data buffer
DWORD nInBufferSize, // size of input data buffer
LPVOID lpOutBuffer, // output data buffer
DWORD nOutBufferSize, // size of output data buffer
LPDWORD lpBytesReturned, // byte count
LPOVERLAPPED lpOverlapped // overlapped information
);
I found this funcjtion in the vc project .but for a Qt project how to write/read datas into a USB device?

[kuzulis]

This DeviceIoControl() function is a part of Win32 API, and does not related to Qt at all. So, you can use this function as well as in VS. Please read the MSDN to find out a Win-API headers which need to include to your project.

[youfulan2015]

@kuzulis
another question I got DLL build by vc6 ,here is the function inside:
#ifndef DLL_API
#define DLL_API extern "C" __declspec(dllimport)
#endif

#define WIN_API __stdcall

....................
DLL_API void WINAPI HTDrawTopPentagon(HDC hDC,int nCenterX,int nCenterY,COLORREF clr);
...................
in QT I wang to use these funtions.
will it work if I program like this:
"
QLibrary myLib("dll_name");

typedef int (*MyPrototype)(QPixmap* ,int,int,QColor);
MyPrototype myFunction = (MyPrototype) myLib.resolve("HTDrawTopPentagon");

myFunction test;
will test work?
or should i typedef int (*MyPrototype)(HDC ,int,int,COLORREF);in QT?

[kuzulis]

or should i typedef int (*MyPrototype)(HDC ,int,int,COLORREF);in QT?

yes

[Jeroentjehome]

Hi,
Because Qt is cross platform using a WinAPI is bad form. Shouldn't you switch to libusb making it cross platform?