error LNK2001: unresolved external symbol __imp__Py_InitModule4 - visual-c++

Question

I'm trying to extend Python with C++. I'm using Visual C++ 2008 and Python 2.7. I have had a lot of problems building the .dll file, and finally when it seemed to be everything correct, I can't stop getting this error:
error LNK2001: unresolved external symbol _imp_Py_InitModule4
I know it isn't a linker error because I had this error before (it gave me the error but with all kind of Py_... functions) and I had resolved that.
I don't know if this is an important data but I have build python27_d.dll with VC++ 2008 too.
This is the code:
#include "Python.h"
#include <windows.h>
#include <string.h>
#include <tchar.h>
#include <stdlib.h>
#include <Aclapi.h>
struct file_perms {
char user_domain[2050];
unsigned long user_mask;
};
void lookup_sid ( ACCESS_ALLOWED_ACE* pACE, char user_domain[] ) {
char username[1024]="";
char domain[1024]="";
ULONG len_username = sizeof(username);
ULONG len_domain = sizeof(domain);
PSID pSID =(PSID)(&(pACE->SidStart));
SID_NAME_USE sid_name_use;
LPWSTR username1 = reinterpret_cast<LPWSTR>( username );
LPWSTR domain1 = reinterpret_cast<LPWSTR>( domain );
if (!LookupAccountSid(NULL, pSID, username1, &len_username, domain1, &len_domain, &sid_name_use)){
strcpy(user_domain, "unknown");
} else {
strcat(user_domain,domain);
strcat(user_domain,"\\");
strcat(user_domain,username);
}
}
void acl_info( PACL pACL, ULONG AceCount, file_perms fp[]){
for (ULONG acl_index = 0;acl_index < AceCount;acl_index++){
ACCESS_ALLOWED_ACE* pACE;
if (GetAce(pACL, acl_index, (PVOID*)&pACE))
{
char user_domain[2050]="";
lookup_sid(pACE,user_domain);
strcpy(fp[acl_index].user_domain,user_domain);
fp[acl_index].user_mask=(ULONG)pACE->Mask;
}
}
}
static PyObject *get_perms(PyObject *self, PyObject *args)
{
PyObject *py_perms = PyDict_New();
//get file or directory name
char *file;
if (!PyArg_ParseTuple(args, "s", &file))
return NULL;
//setup security code
PSECURITY_DESCRIPTOR pSD;
PACL pDACL;
//GetNamedSecurityInfo() will give you the DACL when you ask for
//DACL_SECURITY_INFORMATION. At this point, you have SIDs in the ACEs contained in the DACL.
LPWSTR file1 = reinterpret_cast<LPWSTR>( file );
ULONG result = GetNamedSecurityInfo(file1,SE_FILE_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL,
&pDACL, NULL, &pSD);
if (result != ERROR_SUCCESS){ return NULL;}
if (result == ERROR_SUCCESS){
ACL_SIZE_INFORMATION aclSize = {0};
if(pDACL != NULL){
if(!GetAclInformation(pDACL, &aclSize, sizeof(aclSize),
AclSizeInformation)){
return NULL;
}
}
file_perms *fp = new file_perms[aclSize.AceCount];
acl_info(pDACL, aclSize.AceCount, fp );
//Dict
for (ULONG i=0;i<sizeof(fp);i++){
PyObject *domain = Py_BuildValue("s",fp[i].user_domain);
PyObject *user = Py_BuildValue("s",fp[i].user_mask);
PyDict_SetItem(py_perms,domain,user);
}
}
return py_perms;
};
static PyMethodDef fileperm_methods[] = {
{ "get_perms", get_perms, METH_VARARGS, "Execute a shell command." },
{ NULL, NULL, 0, NULL }
};
extern "C"
__declspec(dllexport)
void init_fileperm(void)
{
PyObject *m=Py_InitModule("fileperm",fileperm_methods);
return;
}
I'm working in Windows 7 64bits.
I know that Py_InitModule is deprecated for Python 3 but I'm working in Python27 (2.7.3 ).
Does someone know why I get this error?
Thanks!

Answer 1

I had the same problem.
If you're compiling a 64-bit pyd, make sure python27.lib is also 64-bit (same goes for compiling a 32-bit pyd with a 32-bit python27.lib).