[SOLVED] Can't add custom class!

bareil76

Hi all,
I cannot find why I get this error:

@hid_pnp.obj:-1: error: LNK2001: unresolved external symbol "public: bool __thiscall CHexManager::LoadHexFile(void)" (?LoadHexFile@CHexManager@@QAE_NXZ)@

Here is my CHexManager class header
@#ifndef HEX_H
#define HEX_H

#pragma once
#include "stdio.h"
#include <QObject>

typedef struct
{
unsigned char RecDataLen;
unsigned int Address;
unsigned int MaxAddress;
unsigned int MinAddress;
unsigned char RecType;
unsigned char* Data;
unsigned char CheckSum;
unsigned int ExtSegAddress;
unsigned int ExtLinAddress;
}T_HEX_RECORD;

// Hex Manager class
class CHexManager
{

public:
unsigned int HexTotalLines;
unsigned int HexCurrLineNo;
bool LoadHexFile(void);
--
//Constructor
CHexManager()
{
HexFilePtr = NULL;
}
//Destructor
~CHexManager()
{
// If hex file is open close it.
if(HexFilePtr)
{
fclose(HexFilePtr);
}
}

private:
QString HexFilePath;
FILE *HexFilePtr;

};

#endif // HEX_H
@

and source

@
#include "hex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = FILE;
#endif

// Virtual Flash.
#define KB (1024)
#define MB (KB*KB)

// 5 MB flash
static unsigned char VirtualFlash[5*MB];

#define BOOT_SECTOR_BEGIN 0x7FC000

#define DATA_RECORD 0
#define END_OF_FILE_RECORD 1
#define EXT_SEG_ADRS_RECORD 2
#define EXT_LIN_ADRS_RECORD 4

/****************************************************************************

Loads hex file
\param
\param
\param
\return true if hex file loads successfully
*****************************************************************************/
bool CHexManager::LoadHexFile(void)
{
char HexRec[255];

HexFilePath = fileDialog.GetPathName();

// Open file
HexFilePtr = fopen(HexFilePath, "r");

if(HexFilePtr == NULL)
{
// Failed to open hex file.
return false;
}
else
{
```
 HexTotalLines = 0;
 while(!feof(HexFilePtr))
 {
     fgets(HexRec, sizeof(HexRec), HexFilePtr);
     HexTotalLines++;
 }
```
}

return true;
}
@

In my MainWindow.h file I have declared in the public section:
@ CHexManager HexManager; //load Hex manager class@

and in my MainWindow.c file.. if I try to run @HexManager.LoadHexFile();@

I get the error.

What am I doing wrong??

Buckets

I think I had the issue you are having before.
I ended up removing my build folder, cleaned the project, then rebuilt it and the linkage error went away.

dbzhang800

Have you added the hex.cpp file to your project?

bareil76

Yes.. hex.cpp is in the project tree.

SGaist

Hi,

In the project tree doesn't mean it gets compiled. Do you list in the sources in your pro file ?

bareil76

yes.. it was listed.

SGaist

Can you show your pro file ?

bareil76

@#-------------------------------------------------

Project created by QtCreator 2012-09-04T13:47:46

#-------------------------------------------------
QT += gui declarative
QT += core gui
#DEFINES +=QT_DISABLE_DEPRECATED_BEFORE=0x040800 #0x050100 to disable functions deprecated in Qt 5.1 and earlier
greaterThan(QT_MAJOR_VERSION, 4): QT += printsupport

TARGET = MyApp
TEMPLATE = app

SOURCES += main.cpp
mainwindow.cpp
hid_pnp.cpp
qcustomplot.cpp
windows/hid.c
hex.cpp

HEADERS += mainwindow.h
hid_pnp.h
qcustomplot.h
hidapi.h
hex.h

FORMS += mainwindow.ui

#-------------------------------------------------

Add the Signal11's hidapi library that was

created

#-------------------------------------------------
macx: LIBS += -L../HIDAPI/mac -lHIDAPI
#win32: LIBS += -L../HIDAPI/windows -lHIDAPI
unix: !macx: LIBS += -L../HIDAPI/linux -lHIDAPI

#-------------------------------------------------

Make sure to add the required libraries or

frameoworks for the hidapi to work depending on

what OS is being used

#-------------------------------------------------
macx: LIBS += -framework CoreFoundation -framework IOkit
win32: LIBS += -lSetupAPI
unix: !macx: LIBS += -lusb-1.0

#-------------------------------------------------

Make sure output directory for object file and

executable is in the correct subdirectory

#-------------------------------------------------
macx {
DESTDIR = mac
OBJECTS_DIR = mac
MOC_DIR = mac
UI_DIR = mac
RCC_DIR = mac
}
unix: !macx {
DESTDIR = linux
OBJECTS_DIR = linux
MOC_DIR = linux
UI_DIR = linux
RCC_DIR = linux
}
win32 {
DESTDIR = windows
OBJECTS_DIR = windows
MOC_DIR = windows
UI_DIR = windows
RCC_DIR = windows
}

@

bareil76

I tried again.. and got the same error.

SGaist

Did you delete the build directory and do a full rebuild ?

bareil76

I just tried and no it doesn't work.

It should be so simple!

SGaist

Are all your files in the same folder ?

bareil76

Yes.. they are.

Thank you for your help by the way!

SGaist

Are you also calling this function in hid_pnp ?

bareil76

In hid_pnp.. I setup an instance of the class by using

CHexManager HexManager;

so calling HexManager.LoadHexFile(); in hid_pnp... will produce the error.

SGaist

Then let's go step by step, comment all call to that function and build again, once it does, re-add them one by one.

bareil76

THANK YOU!!!!

I got it... I don,t know why I did this. But I had included #include "hid_pnp.h" in my hex.c file.

Going to the strict minimum was a good idea.

SGaist

You're welcome !

Since you have it working now, don't forget to update the thread title prepending [solved] so other forum users may know a solution has been found :)