Qt and std::string

Question

I have a strange problem. My tool is running properly when I open a file through my Qt file dialog. However, when I bind dlls from other library into my project in VS 2010, the tool crashes when I open a file. By debugging I discovered that it happens in the destructor of the basic string. The following line is causing the problem:

std::string inputFilename = aFilenames.at(i).toStdString();

where aFilenames is a QStringList. If instead I write:

std::string inputFilename = "C:\\test.txt";

then it works. What is then going wrong with std::string and why this happens when I bind dlls from another library into my project?

Are you sure that your specific string at location i exists? You're not reading somewhere beyond the vector/array? — Bart
– Bart, Commented Oct 24, 2012 at 10:20
I cannot reproduce the problem, you need to provide more information. — bjoernz
– bjoernz, Commented Oct 24, 2012 at 10:22
Yes, I am sure that I am not out of bound. I could see it in the debugger. Anyway, if I do not bind the dlls, it works.. . The problem arises when I bind the dlls (third party libraries). But what is the difference between my first statement and the second statement? They are both std::strings... — ISTB
– ISTB, Commented Oct 24, 2012 at 10:27
Another suggestion, convert string to C string (char array with \0 a the end), and then the C string to std::string (assuming your filename does not have any non-ASCII chars). — hyde
– hyde, Commented Oct 24, 2012 at 10:36
@ISTB Hard to quess what the problem was without seeing intermediate values (debug output, I mean). It may have been some esoteric character encoding issue related to current default encoding, either at Qt or at STL side. — hyde
– hyde, Commented Oct 24, 2012 at 11:53

Al2O3 · Accepted Answer · 2012-10-25 02:37:32Z

1

Try this:

string(aFilenames.at(i).toLocal8Bit())

edited Oct 25, 2012 at 2:37

answered Oct 24, 2012 at 10:34

Al2O3

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2 Comments

Al2O3 Over a year ago

I am not sure, but my windows program has no problem with numerous tests since using it.

Aleksei Zabrodskii Over a year ago

How does QByteArray ended as const char[]? upd (That's just obvious, doesn't it?)

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