String sn = "";
String key = "";
int error_code = Library.initialize(sn, key);
if (error_code != e_ErrSuccess) {
    return;
}
// 加载 "Sample.pdf" 文档
PDFDoc doc = new PDFDoc("Sample.pdf");
error_code = doc.load(null);
if (error_code != e_ErrSuccess) {
    return;
}
// 获取文档的第一页
PDFPage page = doc.getPage(0);
// 解析页面
page.startParse(e_ParsePageNormal, null, false);
...

NSString* sn = @" ";
NSString* key = @" ";
// 初始化库
FSErrorCode code = [FSLibrary initialize:sn key:key];
if (code != FSErrSuccess) {
    return -1;
}
// 加载一个 PDF 文档，并解析文档的第一页
NSString* pdfpath = [[NSBundle mainBundle] pathForResource:@"Sample" ofType:@"pdf"];
FSPDFDoc* doc = [[FSPDFDoc alloc] initWithPath:pdfpath];
FSErrorCode errorCode = [doc load:nil];
if (errorCode != FSErrSuccess) {
    return -1;
}
FSPDFPage* page = [doc getPage:0];
[page startParse:FSPDFPageParsePageNormal pause:nil is_reparse:NO];
...

string sn = "";
string key = ""; 
//初始化SDK
ErrorCode error_code = Library.Initialize(sn, key);
if (error_code != ErrorCode.e_ErrSuccess){
    Console.WriteLine("Library Initialize Error: {0}\n", error_code);
    return;
}
//加载“Sample.pdf”文档
using (PDFDoc doc = new PDFDoc(@"Sample.pdf")){
   error_code= doc.Load(null);
   if (error_code != ErrorCode.e_ErrSuccess){
     return;
   }
   //获取文档的第一页并解析
   using (PDFPage page = new PDFPage(doc.GetPage(0))){
     page.StartParse(0, null, true);
     ...
   }
}

var pdfui = new UIExtension.PDFUI({
   viewerOptions: {
       libPath: './lib', // web sdk的库路径。
       jr: {
           licenseSN: licenseSN,
           licenseKey: licenseKey
       }
   },
   renderTo: '#pdf-ui' // the div (id="pdf-ui").
});
// 根据需要修改文件路径。
fetch('/docs/FoxitPDFSDKforWeb_DemoGuide.pdf').then(function (response) {
    response.arrayBuffer().then(function (buffer) {
        pdfui.openPDFByFile(buffer);
    })
})

// 初始化库。
int errorCode = Library.initialize(sn, key);
if (errorCode != Constants.e_ErrSuccess)
 return;
// 实例化一个 PDFViewCtrl 对象。
pdfViewCtrl = new PDFViewCtrl(this);
// 设置 RMS UI 操作的关联活动。
pdfViewCtrl.setAttachedActivity(this);
uiExtensionsManager = new UIExtensionsManager(this.getApplicationContext(), pdfViewCtrl);
uiExtensionsManager.setAttachedActivity(this);
uiExtensionsManager.onCreate(this, pdfViewCtrl, savedInstanceState);
pdfViewCtrl.setUIExtensionsManager(uiExtensionsManager);
// 打开并渲染 PDF 文档。
String path = Environment.getExternalStorageDirectory().getPath() + "/FoxitSDK/Sample.pdf";
uiExtensionsManager.openDocument(path, null);
...

//初始化SDK
NSString *sn = @"";
NSString *key = @"";
FSErrorCode eRet = [FSLibrary initialize:sn key:key];
if (FSErrSuccess != eRet) {
   return; }

//以全屏尺寸初始化一个FSPDFViewCtrl对象
FSPDFViewCtrl* pdfViewCtrl;
pdfViewCtrl = [[FSPDFViewCtrl alloc] initWithFrame: [self.view bounds]];

//打开PDF进行显示
NSString* pdfPath = [[NSBundle mainBundle] pathForResource:@"Sample" ofType:@"pdf"];
[pdfViewCtrl openDoc:pdfPath password:nil completion:nil];
[self.view addSubview:pdfViewCtrl];
...