Thread: Linker Problems

I'm wondering if there's anything really obvious I'm doing wrong?

Well you're doing a few things wrong:
1) You didn't read the Announcements before posting.
2) You didn't use [code] tags, which leads us back to #1.
3) You didn't post your linker errors, which leads us back to #1.

Quzah.

You probably forgot to tell your linker to link the ImageMagick library into your executable. Functions are not contained in .h files. Their headers are. You still need the library, otherwise the symbols introduces in those headers cannot be found.

Originally Posted by quzah

2) You didn't use [code] tags, which leads us back to #1.

I can't see any actual code.

I don't see anything in the anouncements which relates to what I posted, but fair enough.

The errors are just
main.obj : error LNK2001: unresolved external symbol _EdgeImage

repeated for all the ImageMacick functions.

Thanks for the advice Nyda, I'll try and have a look at that

Edit: OK, got it sorted. Thanks again

Originally Posted by Nyda

You probably forgot to tell your linker to link the ImageMagick library into your executable. Functions are not contained in .h files. Their headers are. You still need the library, otherwise the symbols introduces in those headers cannot be found.

I can't see any actual code.

I can.

Originally Posted by Jason84

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <magick/api.h>

That isn't "actual code"?

Quzah.

Originally Posted by Nyda

If you want to be picky about it, no. It won't be compiled.

If I want to be picky about it, which I did, it will compile:

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
/* #include <magick/api.h> I don't have this, so I'll exclude it. */

gcc -c yesitwill.c -Wall

It did, and it does compile. It is "real code". Just because you don't feel like compiling it, doesn't make the above "not real code". It is. It does compile. It will make an object file. It did make an object file. My compiler believes it is "real code".

Quzah.

It is a preprocessor command. Your compiler won't see anything of it. It will see the resolved header contents, but not the include.

Oh really?

Code:

/*myheader.c*/
#include "myheader.h"

Compile and execute:

gcc -o myheader myheader.c
./myheader

Code:

/*myheader.h*/
#include <stdio.h>
int main( void )
{
    printf("So you're trying to say just because it's a header, it's not real code?\n");
    return 0;
}

My compiler definately will see it. Just because you call it a ".h", doesn't mean nothing else happens. If you don't believe me, try the above. You're trying to tell me that the compiler doesn't parse header files? What? That's pretty amusing.

The fact that you're wrong aside, I can't believe you're advocating not using [code] tags. What a tool.

Quzah.

But then again, I'm more or less new here too, so you'll probably just tell me to shut up and stop complaining until I get a decent postcount. Oh well. That's exacty what I'll do now.

Noone cares what your post count is. What they do care about is if you actually pay attention to the forum rules. Now, if you don't read them, you can't very well pay attention to them, can you? The point is, you were wrong and you were called on it. It happens. I didn't flame you, you would know if I had.

The main point was, if you don't post enough information, how can we help? In otherwords, if you're getting an error, don't say "I'm getting an error, help!", say "I'm getting this error:" and then show us what it is. This should be covered in the Announcements, but isn't clarified enough. I'll see if we can't get it modified to spell it out clearer.

As to your "you aren't even using quote tags" remark, had you read the Announcements, you'd have seen that the only tags of importance are [code] tags, which is why there's an entire seperate announcement for it.

Quzah.

Originally Posted by quzah

Noone cares what your post count is.

People in General Discussions obviously disagree.

Who cares if quotes are in the announcements or not - I didn't complain about it, just pointed it out.
On another matter, I strongly believe you got confused with me and the original poster somewhere in the middle of your post.
If you feel you picked the right kind of language I'll just assume we're communication-incompatible and leave it at that.

That said, I'm not going to discuss this anymore because I feel it's not even worth half the trouble we're taking here.

Rules are of importance, and induce their cause.

Reply #3 states after the recent editing at 11:02 AM PST Yesterday:

Originally Posted by Jason84

Edit: OK, got it sorted. Thanks again

I believe that leads us to the illation of this topic nevertheless.

@ stack overflow: i see jason84 and nyda have met quazah.