wprintf problem

[roadragedave]

Very true, I am an idiot, BUT!, when I do that I get a strange output ╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠ I have never seen these characters before We have a mathematician, a different kind of mathematician, and a statistician!

[David Crow]

How about:

wsprintf(sz, TEXT("Load Percentage: %s\n"), V_BSTR(&vVal));

or

wprintf(TEXT("Load Percentage: %s\n"), V_BSTR(&vVal));

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"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

[roadragedave]

No good, now I get an Unhandled Exception http://www.81x.com/Authors/roadragedave/exception.jpg We have a mathematician, a different kind of mathematician, and a statistician!

[David Crow]

Hmmm, this code snippet works for me:

TCHAR sz[MAX_PATH];
VARIANT vVal;
vVal.vt = VT_BSTR;
vVal.bstrVal = SysAllocString(_T("95%"));
wsprintf(sz, _T("Load Percentage: %s\n"), V_BSTR(&vVal));

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"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

[Tim Smith]

Your BSTR is bad. It doesn't really point to a BSTR. Tim Smith I'm going to patent thought. I have yet to see any prior art.

[roadragedave]

Very nice, What my problem is, is that I am calling a function called GetProperty hRes = WmiTest.GetProperty(accClass, accProperty, accKey, &vVal); vVal, which is VARIANT, has the property value which I want to display, so how do I do this? Im sorry for being a pest on this one, thanks for your help We have a mathematician, a different kind of mathematician, and a statistician!

[roadragedave]

I finally got it, it was so simple in the end, I was getting an exception because I was trying to pass a uint16 to a string. For future reference if anyone has this problem wsprintf(sz, _T("Load Percentage: %s\n"), V_BSTR(&vVal)); should be wsprintf(sz, _T("Load Percentage: %i\n"), V_BSTR(&vVal)); Can you spot the simple difference:doh: Thanks for all yer help everyone We have a mathematician, a different kind of mathematician.............. and a statistician!

[David Crow]

roadragedave wrote: wsprintf(sz, _T("Load Percentage: %i\n"), V_BSTR(&vVal)); This is not right at all. The %i type is for signed decimal integers, which is not what V_BSTR() returns. When the V_BSTR() macro is expanded, notice that it accesses the bstrVal member of the VARIANT structure, not the intVal member. You've simply masked the problem.

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"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

[roadragedave]

I get what you mean, however the function that gets vVal passes it back as uint16, VARIANT, I presume, is a generic data type that holds almost all simple data types and what is needed it to convert to say string, double, BSTR. Using %s threw and exception and I could not figure out using the debuging what exactly was going wrong, I took a chance and changed it to %i, and the application works.:confused: We have a mathematician, a different kind of mathematician, and a statistician!

[David Crow]

roadragedave wrote: ...the function that gets vVal passes it back as uint16, Which means you should be using V_INT() instead of V_BSTR().

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"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)