本文轉自:http://www.pcdog.com/edu/aspdotnet/2006/06/f139082.html
用API得到局域网中可用sqlServer服务器列表
程序实现了用API来得到sqlServer服务器列表的功能，我觉得比用sqlDEMO组件更有意义，代码如下：
/// <summary>
/// </summary>
public class sqlLocator
{
[System.Runtime.InteropServices.DllImport("odbc32.dll")]
private static extern short sqlAllocHandle(short hType,IntPtr inputHandle,out IntPtr outputHandle);
[System.Runtime.InteropServices.DllImport("odbc32.dll")]
private static extern short sqlSetEnvAttr(IntPtr henv,int attribute,IntPtr valuePtr,int strLength);
[System.Runtime.InteropServices.DllImport("odbc32.dll")]
private static extern short sqlFreeHandle(short hType,IntPtr handle);
[System.Runtime.InteropServices.DllImport("odbc32.dll",CharSet= System.Runtime.InteropServices.CharSet.Ansi)]
private static extern short sqlbrowseConnect(IntPtr hconn,System.Text.StringBuilder inString,
short inStringLength,System.Text.StringBuilder outString,short outStringLength,
out short outLengthNeeded);
private const short sql_HANDLE_ENV = 1;
private const short sql_HANDLE_DBC = 2;
private const int sql_ATTR_ODBC_VERSION = 200;
private const int sql_OV_ODBC3 = 3;
private const short sql_SUCCESS = 0;
private const short sql_NEED_DATA = 99;
private const short DEFAULT_RESULT_SIZE = 1024;
private const string sql_DRIVER_STR = "DRIVER=sql SERVER";
private sqlLocator(){}
/// <summary>
/// </summary>
/// <returns></returns>
public static string[] GetServers()
{
string list = string.Empty;
IntPtr henv = IntPtr.Zero;
IntPtr hconn = IntPtr.Zero;
System.Text.StringBuilder inString = new System.Text.StringBuilder(sql_DRIVER_STR);
System.Text.StringBuilder outString = new System.Text.StringBuilder(DEFAULT_RESULT_SIZE);
short inStringLength = (short) inString.Length;
short lenNeeded = 0;
try
{
if (sql_SUCCESS == sqlAllocHandle(sql_HANDLE_ENV,henv,out henv))
{
if (sql_SUCCESS == sqlSetEnvAttr(henv,sql_ATTR_ODBC_VERSION,(IntPtr)sql_OV_ODBC3,0))
{
if (sql_SUCCESS == sqlAllocHandle(sql_HANDLE_DBC,out hconn))
{
if (sql_NEED_DATA == sqlbrowseConnect(hconn,inString,inStringLength,outString,
DEFAULT_RESULT_SIZE,out lenNeeded))
{
if (DEFAULT_RESULT_SIZE < lenNeeded)
{
outString.Capacity = lenNeeded;
if (sql_NEED_DATA != sqlbrowseConnect(hconn,
lenNeeded,out lenNeeded))
{
throw new ApplicationException("Unabled to aquire sql Servers from ODBC driver.");
}
}
list = outString.ToString();
int start = list.IndexOf("{") + 1;
int len = list.IndexOf("}") - start;
if ((start > 0) && (len > 0))
{
list = list.Substring(start,len);
}
else
{
list = string.Empty;
}
}
}
}
}
}
catch
{
list = string.Empty;
}
finally
{
if (hconn != IntPtr.Zero)
{
sqlFreeHandle(sql_HANDLE_DBC,hconn);
}
if (henv != IntPtr.Zero)
{
sqlFreeHandle(sql_HANDLE_ENV,hconn);
}
}
string[] array = null;
if (list.Length > 0)
{
array = list.Split(',');
}
return array;
}
}
注:未驗証正确性
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