C + + c procedures can directly transfer function? I c and is not very familiar with C + +. LDAP api wants to use C + + function. But we do not know why, c documents are available ldap function, and C + + can not transfer procedures. Hope you pass the heroes to help out in the end to tell me how to do? #ifdef __cplusplus Extern "C" ( #endif /*...*/ #ifdef __cplusplus } #endif #endif Notes add ldap in the first document. Thank you very much for your help. Now as I do, but still wrong. Where, I do not know whether there was a mistake? #ifdef __cplusplus Extern "C" ( #endif #include "Ldap.h> #ifdef __cplusplus } #endif #include "Stdio.h> #include "Stdlib.h> #include "Unistd.h> #include "Sys/stat.h> Int main (int argc, char* argv[]) {    ..... Ldap_init (ldap_host, LDAP_PORT);    .... } Translation : Linux-c test.cpp -o test Test.cpp : In function `int main mistakes : (int, char**) ': Test.cpp:68 : `ldap_init 'undeclared (first use this function) Test.cpp:68 : (Each undeclared identifier is reported only once for each It appears in function. ) 3rd Floor wenziyan reply to the message Man ldap_init Find where your library installed ldap Facts have proved location is no problem. I finally resolved in a stupid way is to be deployed on a c ldap_init operating procedures, and then call the C + + c procedures adopted procedures to achieve my aim. Thank you for your help. [ Closed window ]