calling a C function using cocoa

Question

I have a C function with the following method signature.

NSString* md5( NSString *str )

How do I call this function, pass in a string, and save the returned string?

I tried the following, but it did not work:

NSString *temp= [[NSString alloc]initWithString:md5(password)];

thanks for your help

That code looks fine, assuming password is an NSString variable. You're going to need to provide more details. How did it "not work"? Where does password come from? — Chuck
– Chuck, Commented Mar 17, 2009 at 2:20
May help to indicate what exactly didn't work. Did the compiler give an error? What was the error? What happens if you try NSString *a = md5(password); NSString *temp = [[NSString alloc] initWithString:a]; — Dave
– Dave, Commented Mar 17, 2009 at 2:21

Charlie Martin · Accepted Answer · 2009-03-17 02:22:45Z

5

You're making it too hard. The stuff in []'s is effectively smalltalk. What you want is to just call the function in C:

NSString * temp = md5(password);

answered Mar 17, 2009 at 2:22

Charlie Martin

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3 Comments

cobbal Over a year ago

temp = [md5(password) copy] or [md5(password) retain] may be needed though

danielpunkass Over a year ago

It's true they're making it too hard, but their code should work, as the comments on the question suggest. Question is bad and needs more details.

Charlie Martin Over a year ago

yeah, but "making it too hard" is usually a sign they don't understand what they're trying to do. Agree more details might help.

Pablo Santa Cruz · Accepted Answer · 2009-03-17 03:08:25Z

0

What is password? Is password a common "char *" pointer? Is the md5 signature you put correct?

If that's the case, you could:

NSString *temp = [[NSString alloc] initWithCString:password  encoding:NSASCIIStringEncoding];

If your md5 signature is: char *md5(char *password), and you have you password stored in a NSString, you could:

NSString password = @"mypass";
char buff[128];
NSString *temp = [[NSString alloc] initWithString:password];
[temp getCString:buff maxLength:128 encoding:NSASCIIStringEncoding];
char *md5 = md5(buff);
// then you could do whatever you want with md5 var

answered Mar 17, 2009 at 3:08

Pablo Santa Cruz

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