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Format Issues - Dynamic width and alignment [message #18866]

Wed, 29 October 2008 17:48

captainc
Messages: 278
Registered: December 2006
Location: New Jersey, USA

Experienced Member

Hey, I'm trying to use alignment and dynamic widths based on the size of strings with the Format function.
Ex:

Cout() << Format("|%20=s|\n", "test"); 		// Works as expected
Cout() << Format("|%*=s|\n", 20, "test"); 	// Seg Fault Heap Corrupted

How can I use * to insert the width I want dynamically?

Update:
Found a small workaround...

String fm("");
int width = 20;
fm.Cat() << "%" << width << "=s";
Cout() << Format(fm, "test");

Would still like to know if it is possible with just 1 formatting line though.

[Updated on: Wed, 29 October 2008 18:05]

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Re: Format Issues - Dynamic width and alignment [message #18893 is a reply to message #18866]

Thu, 30 October 2008 23:29

mirek
Messages: 14255
Registered: November 2005

Ultimate Member

captainc wrote on Wed, 29 October 2008 12:48

Hey, I'm trying to use alignment and dynamic widths based on the size of strings with the Format function.
Ex:

Cout() << Format("|%20=s|\n", "test"); 		// Works as expected
Cout() << Format("|%*=s|\n", 20, "test"); 	// Seg Fault Heap Corrupted

How can I use * to insert the width I want dynamically?

Update:
Found a small workaround...

String fm("");
int width = 20;
fm.Cat() << "%" << width << "=s";
Cout() << Format(fm, "test");

Would still like to know if it is possible with just 1 formatting line though.

Obviously, something like

Cout() << Format(String().Cat() << '%' << width << "=s", "test")

would work. Anyway, the original code should work as well, something to fix (working on it).

BTW, you do not need .Cat there:

fm << "%" << width << "=s";

that is only needed for 'String().Cat()' construct - you cannot write

String() << "hello"

in standard C++.

Mirek

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