error LNK2019: unresolved external symbol
I'm getting this error, and I cant find out whats wrong!
Can anyone help me ?
flatetrimming_test error LNK2019: unresolved external symbol _les_pci_entitet referenced in function _pdi_main
This is my code:
#include
"stdafx.h"
#include
<math.h>#include
<windows.h>#include
<stdio.h>#include
<conio.h>extern
"C"{
#include
<pdi.h>}
/* Entity digitise mask */
//#define DIG_ALL_ENTS "-255"
//#define DIG_SURF_ENTS "50-61"
//#define DIG_POINT_ENTS "4"
//PROTOTYPER
extern "C"long les_pci_entitet(char* EdgeCam_entitet);extern
"C"void pdi_main(void){
//long nId(0);//short nReturn(DONE);//DEKLARER GLOBALE VARIABLE HER:
short i;long idnumber,ent_nummer;char *ent_navn; pdi_valid();
/*
switch (pdi_get_execute_status(&nId))
{
case MENU_SETUP:
nReturn = pdi_help_box("Hello World-menusetup");
break;
case MENU_EXEC:
case PDI_EXEC:
nReturn = pdi_help_box("Hello World -exec");
break;
default:
pdi_help_box("Unexpected Status!");
nReturn = ABORT;
break;
}
*/
if ((i = pdi_get_execute_status(&idnumber)) != PDI_EXEC){
pdi_error("This PDI must be run from the PDI category");
pdi_end(REDO);
}
//SKRIV INN KODE UNDER HER:
ent_navn = "TPT_23";
//les_pci_entitet(navn); //returnerer "long" entitetnoent_nummer=les_pci_entitet(ent_navn);
pdi_delete_entity(ent_nummer);
pdi_end(DONE);
}
//*****************************FUNKSJONER************************************************************
long
les_pci_entitet(char EdgeCam_entitet){
struct ehead h;struct param_var pci_entnavn;short funnet=0;long ent_start,ent_slutt,entitetno; //********************** Lesing av PCI-variable// Leser pcivariabel navn p? entitet som det skal kalkuleres p?memset(&pci_entnavn,0,
sizeof(struct param_var));strcpy((
char*)pci_entnavn.name,"EdgeCam_entitet");pci_entnavn.which=PARAM_STRVAR;
if (!pdi_read_pci_variable(&pci_entnavn)){
pdi_error("\nx_kalkuler_curve_ekstremal : Feil ved lesing av pci-variable ! ");
pdi_end(ABORT);
}
//ent_start=pdi_get_num_ents(ENTS_STARTUP);ent_start=20;
ent_slutt=pdi_get_num_ents(ENTS_CURRENT);
for(ent_start=ent_start;ent_start<=ent_slutt;ent_start++){
if(pdi_get_header(ent_start,&h)){
if(!strcmp(h.name,(char*)pci_entnavn.str)){
entitetno=ent_start;
funnet=1;
break;}
}
}
if(!funnet){
pdi_error("\nflatetrimming_test : Flaten ikke funnet !");
pdi_end(ABORT);
}
//ENTITET ER FERDIG INNLEST I PROGRAMMET
//Entiteten det skal jobbes med har nummer "entitetno" (long)
return
entitetno;}
[6177 byte] By [
MildJoe] at [2007-12-16]
Thanks! it worked fine now.
But I thougt i'd separate it from the main file, and create my own library. Then I ran into a similar problem.
I created this file with the pdi_main :
--
#include
"stdafx.h"
#include
<math.h> #include
<windows.h> #include
<stdio.h> #include
<conio.h> #include
<pdi.h> #include
<flatetrimming_test.h> void
pdi_main(void) {
char *entitetnavn; //pdi_valid(); //SETT INN KODE HER: entitetnavn="$TPT_23";
les_pci_entitet(entitetnavn);
pdi_end(DONE);
}
This compiles fine, but when I build it returns these 2 errors:
1.: forsterket_nakke2 error LNK2019: unresolved external symbol _les_pci_entitet referenced in function _pdi_main2.: forsterket_nakke2 fatal error LNK1120: 1 unresolved externals
I've written the function in the file flatetrimming_test.c like this:
#include
<pdi.h>
#include
<flatetrimming_test.h> long
les_pci_entitet(char* EdgeCam_entitet) {
struct ehead h; struct param_var pci_entnavn; short funnet=0; long ent_start,ent_slutt,entitetno; //********************** Lesing av PCI-variable // Leser pcivariabel navn p? entitet som det skal kalkuleres p? memset(&pci_entnavn,0,
sizeof(struct param_var)); strcpy((
char*)pci_entnavn.name,EdgeCam_entitet); pci_entnavn.which=PARAM_STRVAR;
if (!pdi_read_pci_variable(&pci_entnavn)) {
pdi_error("\nx_kalkuler_curve_ekstremal : Feil ved lesing av pci-variable ! ");
pdi_end(ABORT);
}
ent_start=20;
ent_slutt=pdi_get_num_ents(ENTS_CURRENT);
for(ent_start=ent_start;ent_start<=ent_slutt;ent_start++) {
if(pdi_get_header(ent_start,&h)) {
if(!strcmp(h.name,(char*)pci_entnavn.str)) {
entitetno=ent_start;
funnet=1;
break; }
}
}
if(!funnet) {
pdi_error("\nflatetrimming_test : Flaten ikke funnet !");
pdi_end(ABORT);
}
//ENTITET ER FERDIG INNLEST I PROGRAMMET //Entiteten det skal jobbes med har nummer "entitetno" (long)
return entitetno; }
this also compiles fine, but when i build it returns this:
1: flatetrimming_test error LNK2019: unresolved external symbol _pdi_main referenced in function _PdiWndProc@16
2: flatetrimming_test fatal error LNK1120: 1 unresolved externals
then i move the flatetrimming_test.lib file to the "Library Directory" and i make a flatetrimming_test.h file and save it in the "Include" directory.
right?
my .h file is like this:
--
long
les_pci_entitet(char* EdgeCam_entitet);
--
Any help is appreciated!!
Thanks,
Joe
It is the same issue, you have just moved code around, but have not fixed the error. The file with pdi_main is still compiled with C++ most likely, otherwise you would get error on stdafx.h, because PCH is most likely is C++.
Here is what I would recommend:
- Do you really need to keep C code? If answer is no, either rename all C files into CPP files or use /TP switch.
- If you need to keep C code, separate C code into .c files (for example, flatetrimming_test.c), remove header files for functions in C files (such as flatetrimming_test.h) and then in your CPP files, add extern "C" <function signature>; (for example, extern "C" long les_pci_entitet(char* EdgeCam_entitet);) And remove any other extern "C" function, because I think the second error caused by a line like extern "C" pdi_main(...). If it is C++ function, you need to just add it definition to .h file, the do #include "myheader.h" in .cpp file and use it. Hope this clarifies things for you. Try to get any C++ book, most of them cover how to work with C code from C++ code.
Nikola
MildJoe wrote: