private static List <MsiColumnDefinition> ReadColumnDefinitions(IntPtr viewHandle)
{
List <MsiColumnDefinition> columnDefinitions = new List <MsiColumnDefinition>();
Msi.ViewExecute(viewHandle, IntPtr.Zero);
IntPtr recordHande;
// Get column names
Msi.ViewGetColumnInfo(viewHandle, Msi.MsiColInfoType_Names, out recordHande);
try
{
uint columnCount = Msi.RecordGetFieldCount(recordHande);
for (int i = 0; i < columnCount; i++)
{
MsiColumnDefinition columnDefinition = new MsiColumnDefinition();
columnDefinition.Name = Msi.RecordGetString(recordHande, (uint)(i + 1));
columnDefinitions.Add(columnDefinition);
}
}
finally
{
Msi.CloseHandle(recordHande);
}
// Get column types
Msi.ViewGetColumnInfo(viewHandle, Msi.MsiColInfoType_Types, out recordHande);
try
{
uint columnCount = Msi.RecordGetFieldCount(recordHande);
for (int i = 0; i < columnCount; i++)
{
string columnTypeDescriptor = Msi.RecordGetString(recordHande, (uint)(i + 1));
char columnTypeIndicator = columnTypeDescriptor[0];
switch (Char.ToLower(columnTypeIndicator))
{
case 'i': // Integer
case 'j': // Temporary integer
columnDefinitions[i].DataType = MsiColumnDataType.Integer;
break;
case 's': // String
case 'g': // Temporary string
case 'l':
columnDefinitions[i].DataType = MsiColumnDataType.String;
break;
case 'v': // Binary Stream
case 'o': // Undocumented.
columnDefinitions[i].DataType = MsiColumnDataType.Binary;
break;
default:
throw new NotImplementedException(string.Format("Unexpected column type: '{0}'.", columnTypeDescriptor));
}
}
}
finally
{
Msi.CloseHandle(recordHande);
}
return(columnDefinitions);
}
private static DataTable ReadTable(IntPtr databaseHandle, string tableName)
{
string query = string.Format("SELECT * FROM {0}", tableName);
IntPtr viewHandle;
Msi.DatabaseOpenView(databaseHandle, query, out viewHandle);
try
{
List <MsiColumnDefinition> columnDefinitions = ReadColumnDefinitions(viewHandle);
// Write columns to data table
DataTable dataTable = new DataTable(tableName);
for (int i = 0; i < columnDefinitions.Count; i++)
{
Type columnType;
switch (columnDefinitions[i].DataType)
{
case MsiColumnDataType.String:
columnType = typeof(string);
break;
case MsiColumnDataType.Integer:
columnType = typeof(int);
break;
case MsiColumnDataType.Binary:
columnType = typeof(byte[]);
break;
default:
throw new NotImplementedException(String.Format("Unexpected column type: '{0}'", columnDefinitions[i].DataType));
}
dataTable.Columns.Add(columnDefinitions[i].Name, columnType);
}
// Read rows
IntPtr recordHande = IntPtr.Zero;
try
{
while (Msi.ViewFetch(viewHandle, ref recordHande))
{
DataRow dataRow = dataTable.NewRow();
for (int i = 0; i < columnDefinitions.Count; i++)
{
uint column = (uint)(i + 1);
if (Msi.RecordIsNull(recordHande, column))
{
dataRow[i] = DBNull.Value;
}
else if (columnDefinitions[i].DataType == MsiColumnDataType.Integer)
{
int value = Msi.RecordGetInteger(recordHande, column);
dataRow[i] = value;
}
else if (columnDefinitions[i].DataType == MsiColumnDataType.String)
{
dataRow[i] = Msi.RecordGetString(recordHande, column);
}
else if (columnDefinitions[i].DataType == MsiColumnDataType.Binary)
{
dataRow[i] = Msi.RecordReadStream(recordHande, column);
}
}
dataTable.Rows.Add(dataRow);
}
}
finally
{
if (recordHande != IntPtr.Zero)
{
Msi.CloseHandle(recordHande);
}
}
return(dataTable);
}
finally
{
Msi.CloseHandle(viewHandle);
}
}
