passing argument 1 of strlen from incompatible pointer type

I am taking values from array and saving it in linked list as follows:

NSString *formataddr=[RestaurantList obj开发者_运维百科ectAtIndex:0];
node1->formattedAddress = (char*)malloc(strlen(formataddr)*sizeof(char)+1);

where formattedaddress is char array. But I'm getting error

passing argument 1 of strlen from incompatible pointer type

Can anyone help me solve this? Thanks!

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You can't use strlen() with NSString *, you have to use [formataddr length].

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Try

[formataddr length]

instead of strlen(formataddr)

NSString isn't supported by strlen().