在C#中列出ODBC数据源 [英] Listing ODBC Data Sources in C#

问题描述

我正在寻找一种适当的抽象方法，以使用C#从系统中获取ODBC数据源的列表.我尝试了在注册表中拨动"的技巧，该技巧在英语中效果很好:

        RegistryKey reg = (Registry.CurrentUser).OpenSubKey("Software");
        reg = reg.OpenSubKey("ODBC");
        reg = reg.OpenSubKey("ODBC.INI");
        reg = reg.OpenSubKey("ODBC Data Sources");

        and then, of course, iterating over reg.GetValueNames()

唯一的问题是，我至少在一台西班牙计算机上发现它们的注册表项是西班牙语，因此明显违反这种抽象(如果存在)已经使我陷入麻烦.

是否有执行此操作的库函数?

解决方案

您可以在ODBC32.DLL中调用SQLDataSources函数:

 using System.Runtime.InteropServices;
    public static class OdbcWrapper
    {
        [DllImport("odbc32.dll")]
        public static extern int SQLDataSources(int EnvHandle, int Direction, StringBuilder ServerName, int ServerNameBufferLenIn,
    ref int ServerNameBufferLenOut, StringBuilder Driver, int DriverBufferLenIn, ref int DriverBufferLenOut);

        [DllImport("odbc32.dll")]
        public static extern int SQLAllocEnv(ref int EnvHandle);
    }

列出数据源的示例:

public void ListODBCsources()
    {
        int envHandle=0;
        const int SQL_FETCH_NEXT = 1;
        const int SQL_FETCH_FIRST_SYSTEM = 32;

        if (OdbcWrapper.SQLAllocEnv(ref envHandle) != -1)
        {
            int ret;
            StringBuilder serverName = new StringBuilder(1024);
            StringBuilder driverName = new StringBuilder(1024);
            int snLen = 0;
            int driverLen = 0;
            ret = OdbcWrapper.SQLDataSources(envHandle, SQL_FETCH_FIRST_SYSTEM, serverName, serverName.Capacity, ref snLen,
                        driverName, driverName.Capacity, ref driverLen);
            while (ret == 0)
            {
                System.Windows.Forms.MessageBox.Show(serverName + System.Environment.NewLine + driverName);
                ret = OdbcWrapper.SQLDataSources(envHandle, SQL_FETCH_NEXT, serverName, serverName.Capacity, ref snLen,
                        driverName, driverName.Capacity, ref driverLen);
            } 
        }

    }

使用SQL_FETCH_FIRST_SYSTEM第一次调用SQLDataSources告诉该函数使用System-DSNs开始列出.如果仅从SQL_FETCH_NEXT开始，它将首先列出驱动程序. 链接到Microsoft网站上的功能ref

每个人似乎都知道这一点，但是我昨天才在新的项目中使用此代码时才发现:如果要在64位Windows上使用VS对其进行编译，则必须将目标平台"设置为"x86"，否则代码将被赢得.没跑.

I'm looking for a properly abstract way to get a list of ODBC data sources from the system in C#. I've tried the "Poking-around-in-the-registry" trick, which I've found works fine in English:

        RegistryKey reg = (Registry.CurrentUser).OpenSubKey("Software");
        reg = reg.OpenSubKey("ODBC");
        reg = reg.OpenSubKey("ODBC.INI");
        reg = reg.OpenSubKey("ODBC Data Sources");

        and then, of course, iterating over reg.GetValueNames()

Only problem is that I've discovered on at least one Spanish machine that their Registry keys are, well, in Spanish, so clearly violating this abstraction (if it exists) has already gotten me into trouble.

Is there a library function to do this?

解决方案

You could call the SQLDataSources-function in ODBC32.DLL:

 using System.Runtime.InteropServices;
    public static class OdbcWrapper
    {
        [DllImport("odbc32.dll")]
        public static extern int SQLDataSources(int EnvHandle, int Direction, StringBuilder ServerName, int ServerNameBufferLenIn,
    ref int ServerNameBufferLenOut, StringBuilder Driver, int DriverBufferLenIn, ref int DriverBufferLenOut);

        [DllImport("odbc32.dll")]
        public static extern int SQLAllocEnv(ref int EnvHandle);
    }

Example that lists the Data Sources:

public void ListODBCsources()
    {
        int envHandle=0;
        const int SQL_FETCH_NEXT = 1;
        const int SQL_FETCH_FIRST_SYSTEM = 32;

        if (OdbcWrapper.SQLAllocEnv(ref envHandle) != -1)
        {
            int ret;
            StringBuilder serverName = new StringBuilder(1024);
            StringBuilder driverName = new StringBuilder(1024);
            int snLen = 0;
            int driverLen = 0;
            ret = OdbcWrapper.SQLDataSources(envHandle, SQL_FETCH_FIRST_SYSTEM, serverName, serverName.Capacity, ref snLen,
                        driverName, driverName.Capacity, ref driverLen);
            while (ret == 0)
            {
                System.Windows.Forms.MessageBox.Show(serverName + System.Environment.NewLine + driverName);
                ret = OdbcWrapper.SQLDataSources(envHandle, SQL_FETCH_NEXT, serverName, serverName.Capacity, ref snLen,
                        driverName, driverName.Capacity, ref driverLen);
            } 
        }

    }

The first call to SQLDataSources with SQL_FETCH_FIRST_SYSTEM tells the function to start the listing with the System-DSNs. If you simply started with SQL_FETCH_NEXT it would first list the drivers. Link to the function ref on Microsofts site

Edit:
Everybody seems to know it but I just found out yesterday when I used this code in a new poject: if you are compiling this with VS on a 64 Bit Windows you have to set the "Target Platform" to "x86" or the code won't run.

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