der entfernte Computername ist "SERVER"
der SQL Instanz Name ist "test"
user ist "sa" - kein pass

ich habe im Internet http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odbc/htm/odbcconnecting_with_sqlconnect.asp und http://www.willemer.de/informatik/db/odbcapi.htm)einen Beispiel code gefunden, der zu einer Datenbank verbinden soll.
Aber es klappt nicht.

als retCode bei sqlconnect kriege ich immer einen Fehler von 0xCCCC zurück.
Dabei komme ich in MSDEV 2003 über den Datenbank Explorer auf die Datenbank ohne Probleme.

Was mache ich falsch???

THX

// sqlconsoletest.cpp : Definiert den Einstiegspunkt für die Konsolenanwendung.
//

#include "stdafx.h"
#include "windows.h"
#include <sql.h>
#include <sqlext.h>

#define MYSQLSUCCESS(rc) ((rc==SQL_SUCCESS)||(rc==SQL_SUCCESS_WITH_INFO))
HSTMT hstmt;
HENV hEnv;
HDBC hDBC;
SQLRETURN retCode;

unsigned char szData[1000];  

void error_out(void)
{
   unsigned char szSQLSTATE[10];
   SDWORD nErr;
   unsigned char msg[SQL_MAX_MESSAGE_LENGTH+1];
   SWORD cbmsg;

   while(SQLError(0,0,hstmt,szSQLSTATE,&nErr,msg,sizeof(msg),&cbmsg)==
   SQL_SUCCESS)
   {
      wsprintf((char *)szData,"Error:\nSQLSTATE=%s,Native  error=%ld,msg='%s'",
         szSQLSTATE,nErr,msg);
      MessageBox(NULL,(const char *)szData,"ODBC Error",MB_OK);

   }

}

int _tmain(int argc, _TCHAR* argv[])
{

	SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &hEnv);  
	SQLSetEnvAttr(hEnv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, SQL_IS_INTEGER);
	SQLAllocHandle(SQL_HANDLE_DBC, hEnv, &hDBC);
	if (hDBC) {
//**************** hier FEHLER *************************

		retCode = SQLConnect(hDBC, (UCHAR *)"SERVER\\test", SQL_NTS, 
							(UCHAR *)"sa",SQL_NTS,(UCHAR *)"",0);

		//SQLAllocStmt(hDBC,&hstmt);
		// Deallocate handles, display error message, and exit.
		if (!MYSQLSUCCESS(retCode))
		{
			SQLFreeEnv(hEnv);
			SQLFreeConnect(hDBC);
			error_out();
			exit(-1);
		}

		HSTMT hStmt;
		RETCODE retCode;
		char strPerformer[1024];
		char strTitle[1024];
		long len;

			retCode = SQLAllocHandle(SQL_HANDLE_STMT, hDBC, &hStmt);
			if (retCode==SQL_SUCCESS || retCode==SQL_SUCCESS_WITH_INFO) {
retCode = SQLExecDirect(hStmt, (UCHAR*)"SELECT * FROM roVNC", SQL_NTS);
				if (retCode==SQL_SUCCESS || retCode==SQL_SUCCESS_WITH_INFO) {
					SQLBindCol(hStmt, 1, SQL_C_CHAR, strPerformer, 1024, &len);
					SQLBindCol(hStmt, 2, SQL_C_CHAR, strTitle, 1024, &len);
					while (1) {
						retCode = SQLFetch(hStmt);
						if (retCode==SQL_SUCCESS || retCode==SQL_SUCCESS_WITH_INFO) {
							MessageBox(0, strTitle, strPerformer, MB_OK);
						}else {
							break;
						}
					}
				} else {
					MessageBox(0,"ExecDirect failed", "bad", MB_OK);
				}
				SQLFreeHandle(SQL_HANDLE_STMT, hStmt);
			}else{
				MessageBox(0,"Statement failed", "bad", MB_OK);
			}

		SQLDisconnect(hDBC);
		SQLFreeHandle(SQL_HANDLE_DBC, hDBC);
	}
	SQLFreeHandle(SQL_HANDLE_ENV, hEnv);

	return 0;
}

[Microsoft][ODBC Driver Manager] Der Datenquellenname wurde nicht gefunden, und
es wurde kein Standardtreiber angegeben

int _tmain(int argc, _TCHAR* argv[])
{
   HENV   hEnv = NULL; // Env Handle from SQLAllocEnv()
   HDBC   hDBC = NULL; // Connection handle
   HSTMT  hStmt = NULL;// Statement handle
   UCHAR  szDSN[SQL_MAX_DSN_LENGTH] = "SERVER\\test";// Data Source Name buffer
   UCHAR  szUID[10] = "test";// User ID buffer
   UCHAR  szPasswd[10] = "test";// Password buffer
   UCHAR  szModel[128];// Model buffer
   SDWORD cbModel;// Model buffer bytes recieved
   char   buff[9] = "Testing";
   UCHAR  szSqlStr[128]= "INSERT into (Tablename) (ColumnName) Values ('Testing')" ;

   RETCODE retcode;

  //sprintf((char*)szSqlStr,"INSERT into (Tablename)(Columname) Values ('%s')",buff);
  // Allocate memory for ODBC Environment handle
  SQLAllocEnv (&hEnv);

  // Allocate memory for the connection handle
  SQLAllocConnect (hEnv, &hDBC);

  // Connect to the data source "test" using userid and password.
  retcode = SQLConnect (hDBC, szDSN, SQL_NTS, szUID, SQL_NTS, szPasswd, SQL_NTS);

#define MSG_LEN 256 /* error message buffer length */
UCHAR sqlState[6]; /* buffer to store SQLSTATE */
SDWORD nativeErr; /* native error code */
UCHAR errMsg[MSG_LEN]; /* buffer to store error message */
SWORD realMsgLen; /**/

retcode = SQLError(hEnv, hDBC, hStmt, sqlState,
		&nativeErr, errMsg, MSG_LEN, &realMsgLen);
	printf((char*)errMsg);

  if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
  {
      // Allocate memory for the statement handle
      retcode = SQLAllocStmt (hDBC, &hStmt);  

      // Prepare the SQL statement by assigning it to the statement handle
      retcode = SQLPrepare (hStmt, szSqlStr, sizeof (szSqlStr)); 

      // Execute the SQL statement handle
      retcode = SQLExecute (hStmt);    

      // Project only column 1 which is the models
      SQLBindCol (hStmt, 1, SQL_C_CHAR, szModel, sizeof(szModel), &cbModel);

      // Get row of data from the result set defined above in the statement
      retcode = SQLFetch (hStmt);

      // Free the allocated statement handle
      SQLFreeStmt (hStmt, SQL_DROP);

      // Disconnect from datasource
      SQLDisconnect (hDBC);
  }    

  // Free the allocated connection handle
  SQLFreeConnect (hDBC);  

  // Free the allocated ODBC environment handle
  SQLFreeEnv (hEnv);

  return 0;
}

/*	SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &hEnv);  
	SQLSetEnvAttr(hEnv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, SQL_IS_INTEGER);
	SQLAllocHandle(SQL_HANDLE_DBC, hEnv, &hDBC);
	if (hDBC) {
		retCode = SQLConnect(hDBC, (UCHAR *)"DYNGATESERVER\\roxtra", SQL_NTS, 
							(UCHAR *)"sa",SQL_NTS,(UCHAR *)"",0);

		int i = GetLastError();

		//SQLAllocStmt(hDBC,&hstmt);
		// Deallocate handles, display error message, and exit.
		if (!MYSQLSUCCESS(retCode))
		{
			SQLFreeEnv(hEnv);
			SQLFreeConnect(hDBC);
			error_out();
			exit(-1);
		}

		HSTMT hStmt;
		RETCODE retCode;
		char strPerformer[1024];
		char strTitle[1024];
		long len;

			retCode = SQLAllocHandle(SQL_HANDLE_STMT, hDBC, &hStmt);
			if (retCode==SQL_SUCCESS || retCode==SQL_SUCCESS_WITH_INFO) {
				retCode = SQLExecDirect(hStmt, (UCHAR*)"SELECT * FROM roVNC", SQL_NTS);
				if (retCode==SQL_SUCCESS || retCode==SQL_SUCCESS_WITH_INFO) {
					SQLBindCol(hStmt, 1, SQL_C_CHAR, strPerformer, 1024, &len);
					SQLBindCol(hStmt, 2, SQL_C_CHAR, strTitle, 1024, &len);
					while (1) {
						retCode = SQLFetch(hStmt);
						if (retCode==SQL_SUCCESS || retCode==SQL_SUCCESS_WITH_INFO) {
							MessageBox(0, strTitle, strPerformer, MB_OK);
						}else {
							break;
						}
					}
				} else {
					MessageBox(0,"ExecDirect failed", "bad", MB_OK);
				}
				SQLFreeHandle(SQL_HANDLE_STMT, hStmt);
			}else{
				MessageBox(0,"Statement failed", "bad", MB_OK);
			}

		SQLDisconnect(hDBC);
		SQLFreeHandle(SQL_HANDLE_DBC, hDBC);
	}
	SQLFreeHandle(SQL_HANDLE_ENV, hEnv);

	return 0;
}

Aber warum muss ich das überhaupt machen? Andere Anwendungen (DBmgrK und MSDEV .NET) können es auch ohne!

Über .NET mache ich einfach folgendes:

sqlConn=new SqlConnection();

sqlConn.ConnectionString= "User ID=test; Password=test; Initial Catalog=test; Data Source=testserer\testSQL";

sqlConn.Open();
if (sqlConn.State != System.Data.ConnectionState.Open)
return false;

Funktioniert Wunderbar.

Jetzt nur noch mit der Winapi?!