QString comparison gives wierd crash

[supergillis]

Hello

I get this strange crash when using toAscii() on a QString.
This is the output from the debugger:

0	QTextCodec::fromUnicode		qtextcodec.cpp		1189	
1	QChar::toAscii				qchar.cpp			1261	
2	OutputMessage::addString	OutputMessage.cpp	62	
3	Client::handleFirstPacket	Client.cpp			87	
4	Client::handleMessage		Client.cpp			38	
5	Client::listen				Client.cpp			26
...	<More>

0	QTextCodec::fromUnicode		qtextcodec.cpp		1189	
1	QChar::toAscii				qchar.cpp			1261	
2	OutputMessage::addString	OutputMessage.cpp	62	
3	Client::handleFirstPacket	Client.cpp			87	
4	Client::handleMessage		Client.cpp			38	
5	Client::listen				Client.cpp			26
...	<More>

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This is the code that causes the crash:

void OutputMessage::addString(const QString& value)
{
	addU16(value.length());
	for(QString::const_iterator it = value.begin(); it != value.end(); it++)
		addByte((*it).toAscii());
}

void OutputMessage::addString(const QString& value)
{
	addU16(value.length());
	for(QString::const_iterator it = value.begin(); it != value.end(); it++)
		addByte((*it).toAscii());
}

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But I don't always get this crash. I found out that I only get it when I compare a QString with a (const char?) string.
For example: if I add this piece of code (anywhere in my application)

QString str = "test";
bool result = (str == "test");

QString str = "test";
bool result = (str == "test");

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then it causes the crash. If I remove that piece of code, then the crash doesn't occur and everything runs fine!

Help would be appreciated!
Gillis

Edit
When I use QString::localeAwareCompare instead of ==, it causes no crash. But I want to use ==, how can I do this? What am I doing wrong?