Convert PDF Documents to Image Documents  

string resPath = "***";
string inputFilePath = "***";
string outputFolderPath = "***";
string outputFileName = "***";

CPDFConverter.Init(resPath);
CPDFConverterImg converter = new CPDFConverterImg(inputFilePath);

CPDFConvertImgOptions imgOptions = new CPDFConvertImgOptions();
imgOptions.ImageType = ImgType.PNG;
imgOptions.ImageDpi = 200;
imgOptions.IsContainAnnotations = true;

int pageCount = converter.GetPagesCount();
int[] pageArray = new int[pageCount];
for (int i = 0; i < pageArray.Length; i++)
{
    pageArray[i] = i + 1;
}

ConvertError error = ConvertError.ERR_UNKNOWN;
converter.Convert(outputFolderPath, ref outputFileName, imgOptions, pageArray, ref error, getPorgress);