From cstring to double

Question

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If I use :

CString tempo =_T("0.0057");
double d_tempo = _ttof(tempo);

d_tempo = 0.0000 so _ttof is wrong

What I have tried:

I tried with atof but it's the same thing

Posted 2-Aug-22 5:45am

Member 14594285

Updated 2-Aug-22 8:22am

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Comments

Richard MacCutchan 2-Aug-22 11:49am

I just tried that and it works perfectly, as it probably does in thousands of applications around the world. There is some information that you are not showing us.

0x01AA 2-Aug-22 14:52pm

Are you working in debugger and you don't use d_tempo after that conversion? E.g. my compiler would optimize that in a way I can't trust then the result in the debugger. To avoid that I simply add code like this: if (d_tempo > 0.0);

Member 14594285 3-Aug-22 3:28am

My result is d_tempo = 0.0000 and not 0.0057

0x01AA 3-Aug-22 4:34am

Yes, I understand that. But how you inspect d_temp? With debugger? And if yes, there is a chance that the compiler does 'optimize away' the assignement to d_temp when you don't use d_temp after assignement.
Again: To be sure that it is not 'compiler optimation side effect' do something like


CString tempo =_T("0.0057");
double d_tempo = _ttof(tempo);
if (d_tempo > 0.0);

Of course if you use d_tempo anyhere else the above is not necessary...

2 solutions

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merano99 · Answer 1 · 2022-08-02T08:22:00

Solution 2

Just like Richard, it works without changing anything. Since the function expects pointers, the alternatives would be:

C++

CString tempo = _T("0.0057");
double d_tempo = _ttof(tempo.GetBuffer());

wchar_t const* tempo2 = _T("0.0057");
double d_tempo2 = _ttof(tempo2);

Posted 2-Aug-22 8:22am

merano99

KarstenK · Answer 2 · 2022-08-02T06:10:00

Solution 1

You have some string issue with unicode. Read the Microsoft documentation.

You may use the define

_UNICODE

or use

C++

wcstod()

Posted 2-Aug-22 6:10am

KarstenK

From cstring to double

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From cstring to double

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