Assemble multi PDF files in one Page

    [DQPL LoadFromFile:@"/Users/JMLM/Desktop/advil.pdf" :@""] ;

    [DQPL RenderPageToFile:72: 1 : 5:@"/Users/JMLM/Desktop/testImg/test.png"];

    // Get the original size of the page

    double OriginalWidth = [DQPL PageWidth];

    double OriginalHeight = [DQPL PageHeight];

    // Add a new page

    [DQPL NewPage];

    // Work out the asymmetrical scaling

    double NewWidth = OriginalWidth;

    double NewHeight = OriginalHeight * 196 / 204;

    // Set the dimensions of the new page

    [DQPL SetPageDimensions :NewWidth : NewHeight];

    // Capture the original page (it will be removed

    // from the document automatically)

    int CaptureID = [DQPL CapturePage : 1];

    // Set the original to the top-left corner

    [DQPL SetOrigin : 1];

    // Draw the captured page onto the new page

    [DQPL DrawCapturedPage :CaptureID: 0: 0: NewWidth: NewHeight];

    // Render the page

    [DQPL RenderPageToFile : 204:  1: 5: @"/Users/JMLM/Desktop/testImg/test-2.png" ];

and I tried these lines :  

int pageCount = [DQPL PageCount];

    [DQPL LoadFromFile:@"/Users/JMLM/Desktop/test.pdf" :@""] ;

    [DQPL RenderDocumentToFile:72: 0: pageCount: 5: @"/Users/JMLM/Desktop/testImg/test.png"];