c++ - QT No such file or dictionary when I try to include a header file

Question

This is a very common issue in QT. Include header files and then get the error.

No such file or directory

How to reproduce the issue:

1. First I'm using the CAN Bus Open SAE J1939 library

2. Then I include the source and headers like this.

   SOURCES += 
    Communication/Database/databasehandling.cpp 
    Tool/Json/jsonhandling.cpp 
    main.cpp 
    Window/Main/mainwindow.cpp 
    Communication/USB/usb.cpp 
    Tool/CAN/Hardware/CAN_Network/CAN_Network.c 
    Tool/CAN/Hardware/Memory/FLASH_EEPROM_RAM_Memory.c 
    Tool/CAN/ISO_11783/ISO_11783-7_Application_Layer/Auxiliary_Valve_Command.c 
    Tool/CAN/ISO_11783/ISO_11783-7_Application_Layer/Auxiliary_Valve_Estimated_Flow.c 
    Tool/CAN/ISO_11783/ISO_11783-7_Application_Layer/Auxiliary_Valve_Measured_Position.c 
    Tool/CAN/ISO_11783/ISO_11783-7_Application_Layer/General_Purpose_Valve_Command.c 
    Tool/CAN/ISO_11783/ISO_11783-7_Application_Layer/General_Purpose_Valve_Estimated_Flow.c 
    Tool/CAN/Open_SAE_J1939/Listen_For_Messages.c 
    Tool/CAN/SAE_J1939/SAE_J1939-21_Transport_Layer/Acknowledgement.c 
    Tool/CAN/SAE_J1939/SAE_J1939-21_Transport_Layer/Request.c 
    Tool/CAN/SAE_J1939/SAE_J1939-21_Transport_Layer/Transport_Protocol_Connection_Management.c 
    Tool/CAN/SAE_J1939/SAE_J1939-21_Transport_Layer/Transport_Protocol_Data_Transfer.c 
    Tool/CAN/SAE_J1939/SAE_J1939-71_Application_Layer/Request_Component_Identification.c 
    Tool/CAN/SAE_J1939/SAE_J1939-71_Application_Layer/Request_ECU_Identification.c 
    Tool/CAN/SAE_J1939/SAE_J1939-71_Application_Layer/Request_Software_Identification.c 
    Tool/CAN/SAE_J1939/SAE_J1939-73_Diagnostics_Layer/DM1.c 
    Tool/CAN/SAE_J1939/SAE_J1939-73_Diagnostics_Layer/DM2.c 
    Tool/CAN/SAE_J1939/SAE_J1939-73_Diagnostics_Layer/DM3.c 
    Tool/CAN/SAE_J1939/SAE_J1939-73_Diagnostics_Layer/DM14.c 
    Tool/CAN/SAE_J1939/SAE_J1939-73_Diagnostics_Layer/DM15.c 
    Tool/CAN/SAE_J1939/SAE_J1939-73_Diagnostics_Layer/DM16.c 
    Tool/CAN/SAE_J1939/SAE_J1939-81_Network_Management_Layer/Address_Claimed.c 
    Tool/CAN/SAE_J1939/SAE_J1939-81_Network_Management_Layer/Address_Delete.c 
    Tool/CAN/SAE_J1939/SAE_J1939-81_Network_Management_Layer/Address_Not_Claimed.c 
    Tool/CAN/SAE_J1939/SAE_J1939-81_Network_Management_Layer/Commanded_Address.c
   
   HEADERS += 
    Communication/Database/databasehandling.h 
    Tool/Json/jsonhandling.h 
    Window/Main/mainwindow.h 
    Communication/USB/usb.h 
    Tool/CAN/Hardware/CAN_Network/CAN_Network.h 
    Tool/CAN/Hardware/Memory/FLASH_EEPROM_RAM_Memory.h 
    Tool/CAN/Hardware/Processor_choice.h 
    Tool/CAN/ISO_11783/ISO_11783_Enums/Enum_Auxiliary_And_General_Purpose_Valves.h 
    Tool/CAN/ISO_11783/ISO_11783-7_Application_Layer/Application_Layer.h 
    Tool/CAN/Open_SAE_J1939/Open_SAE_J1939.h 
    Tool/CAN/Open_SAE_J1939/Structs.h 
    Tool/CAN/SAE_J1939/SAE_J1939_Enums/Enum_Control_Byte.h 
    Tool/CAN/SAE_J1939/SAE_J1939_Enums/Enum_DM1_DM2.h 
    Tool/CAN/SAE_J1939/SAE_J1939_Enums/Enum_DM14_DM15.h 
    Tool/CAN/SAE_J1939/SAE_J1939_Enums/Enum_Group_Function_Value.h 
    Tool/CAN/SAE_J1939/SAE_J1939_Enums/Enum_NAME.h 
    Tool/CAN/SAE_J1939/SAE_J1939_Enums/Enum_PGN.h 
    Tool/CAN/SAE_J1939/SAE_J1939_Enums/Enum_Send_Status.h 
    Tool/CAN/SAE_J1939/SAE_J1939-21_Transport_Layer/Transport_Layer.h 
    Tool/CAN/SAE_J1939/SAE_J1939-71_Application_Layer/Application_Layer.h 
    Tool/CAN/SAE_J1939/SAE_J1939-73_Diagnostics_Layer/Diagnostics_Layer.h 
    Tool/CAN/SAE_J1939/SAE_J1939-81_Network_Management_Layer/Network_Management_Layer.h
   

But still I get one error in the Transport_Layer.h file

#ifndef SAE_J1939_21_TRANSPORT_LAYER_SAE_J1939_21_TRANSPORT_LAYER_H_
#define SAE_J1939_21_TRANSPORT_LAYER_SAE_J1939_21_TRANSPORT_LAYER_H_

/* Layers */
#include "../../Hardware/CAN_Network/CAN_Network.h"
#include "../../Open_SAE_J1939/Structs.h"
#include "../SAE_J1939-71_Application_Layer/Application_Layer.h"
#include "../SAE_J1939-73_Diagnostics_Layer/Diagnostics_Layer.h"
#include "../SAE_J1939-81_Network_Management_Layer/Network_Management_Layer.h" <--- This one
#include "../SAE_J1939_Enums/Enum_Control_Byte.h"
#include "../SAE_J1939_Enums/Enum_DM1_DM2.h"
#include "../SAE_J1939_Enums/Enum_DM14_DM15.h"
#include "../SAE_J1939_Enums/Enum_Group_Function_Value.h"
#include "../SAE_J1939_Enums/Enum_NAME.h"
#include "../SAE_J1939_Enums/Enum_PGN.h"
#include "../SAE_J1939_Enums/Enum_Send_Status.h"

And one inside Application_Layer.h file

#ifndef ISO_11783_ISO_11783_7_APPLICATION_LAYER_ISO_11783_7_APPLICATION_LAYER_H_
#define ISO_11783_ISO_11783_7_APPLICATION_LAYER_ISO_11783_7_APPLICATION_LAYER_H_

/* Layers */
#include "../../Hardware/CAN_Network/CAN_Network.h"
#include "../../ISO_11783/ISO_11783_Enums/Enum_Auxiliary_And_General_Purpose_Valves.h" <-- This one
#include "../../Open_SAE_J1939/Structs.h"
#include "../../SAE_J1939/SAE_J1939-21_Transport_Layer/Transport_Layer.h"
#include "../../SAE_J1939/SAE_J1939_Enums/Enum_PGN.h"

Question:

Why does this happening? I have included. The QT Creator IDE sees the files. No problem there. But still, the compiler seems not to understand the existens of these files.

I'm using QT 5.15.2 and C++11.

Answer 1

I found a solution that works for me. You don't need the .pri file as shown in an answer here. Get rid of it.

Here is what I have done.

1. Right click on your project in QT.
2. Select "Add existing dictionary"
3. Mark the dictionary you want to import. Now you are seeing lots of .c and .h files inside the .pro file.

Hint: Don't use ../../, that can cause troubles. Instead use the project path instead e.g

"ThirdLibrary/OpenSAEJ1939/...your_h_files.h"

Done!