PA_DocumentExistOnServer

version 2003

PA_DocumentExistOnServer (docName; fileType; fileCreator) → char

While running under 4D Client, the routine PA_DocumentExistOnServer allows the 4D plug-in to test if a document located on the server machine exists and if the plug-in can access to it.

This routine is available only with 4D Client. To detect if the 4D plug-in is running on 4D Client, use PA_Is4DClient .

Before the call the 4D plug-in passes:

• The name, in docName , of the document to test. The 4D plug-in MUST pass the short name of the document, NOT the pathname to the document. The document will be located in the same folder/directory than the structure.

• The File Type, in fileType , and File Creator in fileCreator , of the file to test. Under Windows, this information is mapped to the Windows file plug-ins declared within the database using the 4D command MAP FILE TYPES or by a ExtW resource located in the .RSR file of a 4D plug-in available for the database.

After the call:

• If the document does not exist, the routine returns 0.

• If the document exists and the 4D plug-in can access it (*), the routine returns 1.

• If the document exists but cannot be not accessed (*), the routine returns 1 and the appropriate MacOS-based File Manager error code in PA_GetLastError .

(*) This routine actually tries to open the document in read-write access (and then immediately close it if successful) in order to determine if the document can be accessed.

Try to avoid error before reading a document on the server.

   long WrapReceiveDocument(char *name, char *data)
   {
      if( PA_DocumentExistsOnServer(name) && PA_GetLastError() == eER_NoErr) )
      {
         /* . . . read the doc . . . */
      }
   }

PA_ReceiveDocumentFromServer , PA_SendDocumentToServer .

Use PA_GetLastError to see if an error occurred