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The correct way to use find is if (para2.find(".jpg") != std::string::npos)

user2176127
– user2176127

2013-11-25 11:53:27 +00:00
Commented Nov 25, 2013 at 11:53
Yes, the return value is size_t type, it is a unsigned int. If no matches were found, the function returns string::npos. It does not mean string::npos is 0, you should use string::npos to check.

thinkinnight
– thinkinnight

2013-11-25 11:56:59 +00:00
Commented Nov 25, 2013 at 11:56
Oh, of course. string::npos is a very large positive number! I overlooked that too. And in fact, the test para2.find(".jpg") would return 0 if the string was equal to ".jpg"

Mr Lister
– Mr Lister

2013-11-25 19:15:56 +00:00
Commented Nov 25, 2013 at 19:15
std::string::npos should be equal to (std::size_t)-1 which is 0xFFFFFFFF.

user2176127
– user2176127

2013-11-25 19:46:10 +00:00
Commented Nov 25, 2013 at 19:46

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