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ContentType

Write Read TwinCAT TIA
Network REST Client ActiveClients One client

ns=2;s=DEPRAG Smart/Network/HTTP/REST/ActiveClients/0/ContentType

Sets or retrieves the content type HTTP header.

Examples:

In addition to the parameters already explained, the following variables must be created / transferred for the implementation in TwinCAT 3:

Beckhoff parameter:

    bHttpReadContentType
    A boolean variable that can be used to trigger the execution of the ReadContentType command.
    bHttpWriteContentType
    A boolean variable that can be used to trigger the execution of the WriteContentType command.
    ContentType
    A STRING(255) variable in which the content type HTTP header is stored.
    hrHttpContentType
    This can be used to monitor the execution of the command. Error codes have the type HRESULT.
    fbHttpRest
    An instance of the "FB_HttpRest" function block supplied with the DEPRAG Smart library.
    ClientId
    A String(255) variable that specifies the client that should execute the command.
    PointerToNodeValue
    A variable of the type "POINTER TO BYTE", in which the value to be set is stored.
    SizeOfNodeValue
    A UINT variable containing the length of the value to be set.
    ConnectionHandle
    "ConnectionHandle" received when establishing a connection between DEPRAG Smart Server and your OPC UA client. 


VAR
     bHttpReadContentType       : BOOL;
     bHttpWriteContentType       : BOOL;
     ContentType          : STRING(255);
     hrHttpContentType        : HRESULT;

     fbHttpRest   : FB_HttpRest;
END_VAR


hrHttpContentType := fbHttpRest.ReadContentType(
       bExecute    := bHttpReadContentType,
       ConnectionHandle  := depragSmartConnection.ConnectionHandle,
       ClientId   := '0',
       Output    => ContentType);
IF hrHttpContentType <> S_FALSE THEN 
     bHttpReadContentType := FALSE;
END_IF 
 
hrHttpContentType := fbHttpRest.WriteContentType(
       bExecute    := bHttpWriteContentType,
       ConnectionHandle  := depragSmartConnection.ConnectionHandle,
       ClientId   := '0',
       PointerToNodeValue  := ADR(ContentType),
       SizeOfNodeValue  := SIZEOF(ContentType));
IF hrHttpContentType <> S_FALSE THEN 
     bHttpWriteContentType := FALSE;
END_IF

For examples and explanations regarding the calls of nodes via Siemens TIA Portal please refer to the sub-menu "Siemens TIA Portal" in section "Getting Started".