public AsciiCompiledTextSearchNative(
NativeMethods.SearchAlgorithmKind kind,
string pattern,
NativeMethods.SearchOptions searchOptions)
{
_patternHandle = new SafeHGlobalHandle(Marshal.StringToHGlobalAnsi(pattern));
var patternLength = pattern.Length;
_handle = CreateSearchHandle(kind, _patternHandle, patternLength, searchOptions);
_searchBufferSize = NativeMethods.AsciiSearchAlgorithm_GetSearchBufferSize(_handle);
}
private static unsafe SafeSearchHandle CreateSearchHandle(
NativeMethods.SearchAlgorithmKind kind,
SafeHGlobalHandle patternHandle,
int patternLength,
NativeMethods.SearchOptions searchOptions)
{
NativeMethods.SearchCreateResult createResult;
var result = NativeMethods.AsciiSearchAlgorithm_Create(
kind,
patternHandle.Pointer,
patternLength,
searchOptions,
out createResult);
if (createResult.HResult < 0)
{
// The error is recoverable, since we are dealing with an invalid pattern
// or something along the lines.
var message = Marshal.PtrToStringAnsi(new IntPtr(createResult.ErrorMessage));
throw new RecoverableErrorException(message);
}
return(result);
}
public AsciiStringSearchNative(NativeMethods.SearchAlgorithmKind kind, string pattern, NativeMethods.SearchOptions searchOptions)
{
_patternHandle = new SafeHGlobalHandle(Marshal.StringToHGlobalAnsi(pattern));
_handle = NativeMethods.AsciiSearchAlgorithm_Create(kind, _patternHandle.Pointer, pattern.Length, searchOptions);
_patternLength = pattern.Length;
}