How to use certselectcertificate on windows 2000
From: scott (sjumsdn_at_newsgroup.nospam)
Date: 04/23/05
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Date: Fri, 22 Apr 2005 15:15:02 -0700
The following program gets an access violation on the call to
cryptselectcertificate at line 145. I think I have all the parameters
correct. Can you tell me what I am doing wrong?
#include <winsock2.h>
#include <windows.h>
#include <wincon.h>
#include <wincrypt.h>
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0500 //GetConsoleWindow needs it
#endif
#include <CryptuiAPI.h>
#include <Cryptdlg.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
long CallCertSelectCertificate(HCERTSTORE hCertStore,
HWND handWindow,
HINSTANCE* phinstcryptdlgLib,
PCCERT_CONTEXT* ppCertContext,
short* psLoadFailure,
char* szError);
long SelectCertificateFromStore(
char* szCertStoreName,
/* in */
HWND lFormHandle,
/* in */
char* szError
/* out */);
void GetSystemErrorString(DWORD dwError,
char* szErrBuf,
DWORD nSize);
#define PROCESSLASTERROR(func) { \
err = GetLastError(); \
sprintf(szError,"%s failed with error %d : ",func,err); \
GetSystemErrorString(err,&szError[strlen(szError)],500); \
lRetval = 1; \
goto cleanup; \
}
typedef PCCERT_CONTEXT (WINAPI
*DefptrCryptUIDlgSelectCertificateFromStore)(HCERTSTORE,HWND,LPCWSTR,LPCWSTR,DWORD,DWORD,void *);
#ifdef UNICODE
typedef BOOL (WINAPI *DefptrCertSelectCertificate)(PCERT_SELECT_STRUCT_W
pCertSelectInfo);
#else
typedef BOOL (WINAPI *DefptrCertSelectCertificate)(PCERT_SELECT_STRUCT_A
pCertSelectInfo);
#endif
int main()
{
long lRetval;
char szError[1024];
/*HWND myhndl;*/
/* myhndl = GetConsoleWindow(); */
lRetval=SelectCertificateFromStore("CA",NULL,szError);
return 0;
}
long SelectCertificateFromStore(
char* szCertStoreName,
/* in */
HWND lFormHandle,
/* in */
char* szError
/* out */)
{
long lRetval = 0;
HCERTSTORE hCertStore = NULL;
PCCERT_CONTEXT pCertContext = NULL;
DWORD err;
HWND handWindow;
short sLoadFailure = 0;
HINSTANCE hinstCryptdlgLib = NULL;
if (!( hCertStore = CertOpenSystemStore(
NULL,
szCertStoreName)))
PROCESSLASTERROR("CertOpenSystemStore()")
if (lFormHandle)
handWindow = lFormHandle;
else
handWindow = NULL;
lRetval =
CallCertSelectCertificate(hCertStore,handWindow,&hinstCryptdlgLib,&pCertContext,&sLoadFailure,szError);
if (lRetval || pCertContext == NULL)
goto cleanup;
cleanup:
if(pCertContext)
CertFreeCertificateContext(pCertContext);
if(hCertStore)
{
if (!CertCloseStore(hCertStore,0))
err = GetLastError(); /* ignore close errors */
}
if (hinstCryptdlgLib) FreeLibrary(hinstCryptdlgLib);
return lRetval;
}
long CallCertSelectCertificate(HCERTSTORE hCertStore,
HWND handWindow,
HINSTANCE* phinstcryptdlgLib,
PCCERT_CONTEXT* ppCertContext,
short* psLoadFailure,
char* szError)
{
long lRetval = 0;
DWORD err;
DefptrCertSelectCertificate ptrCertSelectCertificate;
CERT_SELECT_STRUCT struCertSelect;
HCERTSTORE cStoreArray[1];
*psLoadFailure = 0;
*phinstcryptdlgLib = NULL;
memset(&struCertSelect,0,sizeof(struCertSelect));
*phinstcryptdlgLib = LoadLibrary("cryptdlg");
if (*phinstcryptdlgLib == NULL)
{
*psLoadFailure = 1;
PROCESSLASTERROR("LoadLibrary(cryptdlg)")
}
#ifdef UNICODE
ptrCertSelectCertificate =
(DefptrCertSelectCertificate) GetProcAddress(*phinstcryptdlgLib,
"CertSelectCertificateW");
#else
ptrCertSelectCertificate =
(DefptrCertSelectCertificate) GetProcAddress(*phinstcryptdlgLib,
"CertSelectCertificateA");
#endif
if (ptrCertSelectCertificate == NULL)
{
*psLoadFailure = 1;
PROCESSLASTERROR("GetProcAddress(CertSelectCertificate)")
}
struCertSelect.dwSize = sizeof(struCertSelect);
struCertSelect.hwndParent = NULL; /*handWindow;*/
struCertSelect.szTitle="Your Title";
struCertSelect.cCertStore = (DWORD)1;
cStoreArray[0] = hCertStore;
struCertSelect.arrayCertStore = cStoreArray;
if((ptrCertSelectCertificate)(&struCertSelect) == FALSE)
PROCESSLASTERROR("CertSelectCertificate")
*ppCertContext = *struCertSelect.arrayCertContext;
cleanup:
return lRetval;
}
void GetSystemErrorString(DWORD dwError,
char* szErrBuf,
DWORD nSize)
{
*szErrBuf = 0;
FormatMessage(
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwError,
0, // Default language
(LPTSTR) szErrBuf,
nSize,
NULL
);
}
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