[SOLVED] cannot convert from 'QString' to 'LPCWSTR' ???

Stoned Jesus

I am working on an app where I need to display the file system format of the SD card. Since I couldnt find any Qt API's for it, I choose a windows API GetVolumeInformation and did it as follows:

@TCHAR volumeName[MAX_PATH + 1] = { 0 };
TCHAR fileSystemName[MAX_PATH + 1] = { 0 };
DWORD serialNumber = 0;
DWORD maxComponentLen = 0;
DWORD fileSystemFlags = 0;

LPCWSTR path = deviceData->m_strPath;

if (GetVolumeInformation(
path,
volumeName,
ARRAYSIZE(volumeName),
&serialNumber,
&maxComponentLen,
&fileSystemFlags,
fileSystemName,
ARRAYSIZE(fileSystemName)))
{
qDebug()<<fileSystemName[0];
qDebug()<<fileSystemName[1];
qDebug()<<fileSystemName[2];
qDebug()<<fileSystemName[3];
qDebug()<<fileSystemName[4];
}@

path indicates the SD card path and when I run the app, it throws the following error:
"cannot convert from 'QString' to 'LPCWSTR'". Where am i making a mistake??? Please help!!

cincirin

See "QString::fromWCharArray":http://qt-project.org/doc/qt-5.0/qtcore/qstring.html#fromWCharArray

@
qDebug()<<QString::fromWCharArray(fileSystemName[0]);
...
@

Stoned Jesus

Nevermind I got the solution.

LPCWSTR path = deviceData->m_strPath.utf16();

SGaist

Hi,

I suppose the error is on line 7, you have to convert the QString to an LPCWSTR, IIRC using "toWCharArray":http://qt-project.org/doc/qt-4.8/qstring.html#toWCharArray should do the trick

Stoned Jesus

Thank you SGaist :)

[quote author="SGaist" date="1363091161"]Hi,

I suppose the error is on line 7, you have to convert the QString to an LPCWSTR, IIRC using "toWCharArray":http://qt-project.org/doc/qt-4.8/qstring.html#toWCharArray should do the trick[/quote]

Stoned Jesus

My output now displays 70 65 84 51 50. If anyone wants it in a string format use as follows:

QString::fromUtf16(fileSystemName);