How to get the text object from a position in a pdf file and change the content of the text object?

To get text object from a position in a PDF file using Foxit PDF SDK, follow the steps outlined below:

1. Read the PDF file.
2. Load the page and get the page objects in that page.
3. Use FSPDF_PageObjects_GetObjectAtPos to get the text object in a certain position. Note: use page object get rectangle to see the position of a text object.
4. Change the string in the pdf file and save the document.Here is a simple example:

FS_RESULT ChangeTextObjectContent()

{

               string strFile = "AboutFoxit.pdf";

               FSCRT_FILE file = FSDK_OpenFile(strFile.c_str(), "rb"); //1. Read the PDF file.

 

               FSCRT_DOCUMENT doc;

               FS_RESULT ret  = FSPDF_Doc_StartLoad(file, NULL, &Doc, NULL); //2. Load the page.

               if (FSCRT_ERRCODE_SUCCESS != ret)

               {

                              printf("Failed to load PDF documentn");

                              return ret;

               }

 

               FSCRT_PAGE page = NULL;

               ret = LoadPage(doc, 0, &page);

               if (FSCRT_ERRCODE_SUCCESS != ret)

               {

                              printf("Failed to load a given page.n");

                              return ret;

               }

 

               FSPDF_PAGEOBJECTS pageObjs = NULL;

               ret = FSPDF_Page_GetPageObjects(page, &pageObjs); //2. gets the page objects

               FSPDF_PAGEOBJECT textobject= NULL;

               ret = FSPDF_PageObjects_GetObjectAtPos(page,pageObjs,FSPDF_PAGEOBJECT_TEXT, 92.0, 762.0, 10.00, &textobject); //3. Uses FSPDF_PageObjects_getObjectAtPos

               FSCRT_BSTR unicodeStr;

               FSCRT_BStr_Init(&unicodeStr);

               unicodeStr.str = "Foxit Test";

               unicodeStr.len = 10;

               ret = FSPDF_TextObject_SetUnicodeString(page, textobject,&unicodeStr); //4. Change the string.

               ret = FSPDF_PageObjects_GenerateContents(page, pageObjs);

               const char strEncryptFile[] = "After_revise.pdf";

               FS_BOOL bRet = FSDK_SavePDFFile(doc, strEncryptFile,  FSPDF_SAVEFLAG_INCREMENTAL);          

               FSPDF_Doc_Close(doc);

               return ret;

}

 

FS_RESULT LoadPage(FSCRT_DOCUMENT doc, FS_INT32 index, FSCRT_PAGE *page ) //used in the code above

{

               FS_RESULT ret =  FSPDF_Doc_GetPage(doc, index, page);

               if(FSCRT_ERRCODE_SUCCESS != ret)

               {

                              printf("Failed to get the page %dn", index+1);

                              return ret;

               }

 

               FSCRT_PROGRESS progress;

               ret = FSPDF_Page_StartParse(*page, FSPDF_PAGEPARSEFLAG_NORMAL, &progress);

               if (FSCRT_ERRCODE_SUCCESS != ret)

               {

                              printf("Failed to parse pages.n");

                              return ret;

               }

 

               //Continue to parse page, without pausing.

               ret = FSCRT_Progress_Continue(progress, NULL);

               if (FSCRT_ERRCODE_FINISHED != ret)

               {

                              printf("Failed to finish parsing progress! n", ret);

               } else {

                              ret = FSCRT_ERRCODE_SUCCESS;

                              printf("Succeed to Parse a given PDF page! n");

               }

 

               FSCRT_Progress_Release(progress);

               return ret;

}

Note: This article refers to a deprecated version of a Foxit Product. If you are still using Foxit PDF SDK 5.3 or older, please refer to your download package documents for Developer Guide and API Reference.

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