error LNK2019 and LNK1120 - c

Question

It is a known Topic, but i cant find the solution.
What i did:
createt and console Application.
Add a c source File
Add The path to my Header File to "additional include directorys"
write my code( or ctrl+c + crtl+v)
compile = error
Firste the Code:
#include <stdio.h>
#include <stdlib.h>
#include <sndfile.h>
int main()
{
SNDFILE *sf;
SF_INFO info;
int num_channels;
int num, num_items;
int *buf;
int f,sr,c;
int i,j;
FILE *out;
/* Open the WAV file. */
info.format = 0;
sf = sf_open("file.wav",SFM_READ,&info);
if (sf == NULL)
{
printf("Failed to open the file.\n");
exit(-1);
}
/* Print some of the info, and figure out how much data to read. */
f = info.frames;
sr = info.samplerate;
c = info.channels;
printf("frames=%d\n",f);
printf("samplerate=%d\n",sr);
printf("channels=%d\n",c);
num_items = f*c;
printf("num_items=%d\n",num_items);
/* Allocate space for the data to be read, then read it. */
buf = (int *) malloc(num_items*sizeof(int));
num = sf_read_int(sf,buf,num_items);
sf_close(sf);
printf("Read %d items\n",num);
/* Write the data to filedata.out. */
out = fopen("filedata.out","w");
for (i = 0; i < num; i += c)
{
for (j = 0; j < c; ++j)
fprintf(out,"%d ",buf[i+j]);
fprintf(out,"\n");
}
fclose(out);
return 0;
}
The Error Message:
1>SoundIO.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "_sf_open" in Funktion "_main".
1>SoundIO.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "_sf_read_int" in Funktion "_main".
1>SoundIO.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "_sf_close" in Funktion "_main".
1>C:\Users\Stephan\Desktop\BA\Audio_Coding\SoundIO\Debug\SoundIO.exe : fatal error LNK1120: 3 nicht aufgelöste Externe
The Settings: http://img5.picload.org/image/lccigod/settings.png
What i wanted to do? Simply this: http://ubuntuforums.org/showthread.php?t=968690
What i need? A way to fix this (And how to do it) or an easy guide to get this running.

Answer 1

The linker is telling you that you are missing definitions for the functions from libsndfile. You need to either:
Compile libsndfile from its sources, and link the resulting objects to your program.
Link an import library for libsndfile so that you can dynamically link to libsndfile.
Which solution you opt for depends on how you want to link to libsndfile.

Answer 2

From: http://www.cprogramming.com/tutorial/compiler_linker_errors.html
You may have issues with how you set up your compiler. For instance,
even if you include the correct header files for all of your functions,
you still need to provide your linker with the correct path to the library
that has the actual implementation. Otherwise, you will get "undefined function"
error messages...
While it looks like you've correctly included the necessary headers in your code and you've got everything compiling, you need to either statically or dynamically link to libsndfile in order to resolve your linker errors.

Answer 3

If you are including header files then you must ensure that they are in the include directory of your C++ directory. If it is an external file then you must add their path to your project from project properties.