Question

我在SQLite sqlite3_column_origin_name function解决了我的问题，只是简单地解决了问题，但现在我又遇到了一个大问题。

我有一个带有这些导入的sqlwrapper：

    [DllImport("sqlite3.dll", EntryPoint = "sqlite3_column_int")]
    static extern int sqlite3_column_int(IntPtr stmHandle, int iCol);

    [DllImport("sqlite3.dll", EntryPoint = "sqlite3_column_text")]
    static extern string sqlite3_column_text(IntPtr stmHandle, int iCol);

    [DllImport("sqlite3.dll", EntryPoint = "sqlite3_column_double")]
    static extern double sqlite3_column_double(IntPtr stmHandle, int iCol);

这是我的ExecuteQuery函数：

    public DataTable ExecuteQuery(String query)
    {

        SQLiteWrapper.query = query;

        if (!_open)
            throw new SQLiteException("SQLite database is not open.");

        //prepare the statement
        IntPtr stmHandle = IntPtr.Zero;
        try
        {
            stmHandle = Prepare(query);
        }
        catch(Exception e)
        {
            Log.e(e.Message);
            return null;
        }


        // Prevensione sul out of memory
        if(stmHandle == IntPtr.Zero) 
        {
            return null;
        }

        //get the number of returned columns
        int columnCount = sqlite3_column_count(stmHandle);

        DataTable dTable = null;
        try
        {
            //create datatable and columns
            dTable = new DataTable();
            for (int i = 0; i < columnCount; i++)
            {
                try
                {
                    ArrayList selections = Utils.getQuerySelection(query);
                    foreach(String s in selections) 
                    {
                        dTable.Columns.Add(s);
                    }
                    //Workaround for sqlite3_column_origin_name

                    //dTable.Columns.Add("_id");
                   //dTable.Columns.Add(sqlite3_column_origin_name(stmHandle, i));
                }
                catch(Exception e) 
                {

                }
            }

            //populate datatable
            while (sqlite3_step(stmHandle) == SQLITE_ROW)
            {
                object[] row = new object[columnCount];
                for (int i = 0; i < columnCount; i++)
                {
                    switch (sqlite3_column_type(stmHandle, i))
                    {

                        case SQLITE_INTEGER:
                            // WORKS CORRECTLY!!!!
                            row[i] = sqlite3_column_int(stmHandle, i);
                            break;
                        case SQLITE_TEXT:
                            // ERROR!!!!!!!!!!!!!!!!!!!!!!
                            row[i] = sqlite3_column_text(stmHandle, i);
                            break;
                        case SQLITE_FLOAT:
                            row[i] = sqlite3_column_double(stmHandle, i);
                            break;
                    }
                }
                dTable.Rows.Add(row);
            }
        }
        catch(AccessViolationException ave)
        {
            Log.e("SqliteWrapper - AccessViolationException - " + ave.Message + ":" + query);
            return null;
        }

        // Se ci sono stati errori allora torna null e ritenta la query
        Boolean finalized = Finalize(stmHandle);
        if(!finalized) 
        {
            return null;
        }
        return dTable;
    }

当我调用sqlite3_column_text（...）时，我的应用程序崩溃了。我已经探索了dll文件中的函数，并且这个入口点“sqlite3_column_text”存在。

我可以解决我的问题吗？

编辑：我从http://sourceforge.net/projects/sqlite-dotnet2/files/SQLite%20for%20ADO.NET%202.0/1.0.66.0/

下载我的sqlite3.dll文件

文件在/ bin / x64中，我已将其重命名为sqlite3.dll

编辑2：点击我有的更多信息：

文件che contribuiscono alla描述del problema：
  C：\ Users \用户Utente \应用程序数据\本地的\ Temp \ WERB927.tmp.WERInternalMetadata.xml   C：\ Users \用户Utente \应用程序数据\本地的\ Temp \ WERD59D.tmp.appcompat.txt
  C：\用户\ Utente \应用程序数据\本地\ TEMP \ WERD5BD.tmp.mdmp

Leggere l'informativa sulla在线隐私：
  http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0410

Se l'informativa sulla privacy onlinenonèdisponibile，leggere   离线quella：C：\ Windows \ system32 \ it-IT \ erofflps.txt

Answer 1

尝试以下代码

[DllImport("sqlite3.dll", EntryPoint = "sqlite3_column_text")]
    static extern string sqlite3_column_text(IntPtr stmHandle, int iCol);

string→IntPtr

[DllImport("sqlite3.dll", EntryPoint = "sqlite3_column_text")]
static extern IntPtr sqlite3_column_origin_name(IntPtr stmHandle, int iCol);

row[i] = Marshal.PtrToStringAnsi(sqlite3_column_text(stmHandle, i));

SQLite3.dll问题x64

1 个答案: