Re: unresolved external symbol

In labtest2.h, the function should be declared as :-

namespace K1
{
int ReadLn(FILE *ifile, char line[]);
}

--
Regards,
Nish [VC++ MVP]


"AK" <AK@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:387E6E8D-3BB0-45CC-AD86-088E74CAE5EB@xxxxxxxxxxxxxxxx
> In the scaled down version, I only have 3 files : Form1.cpp, Lab Test 2.h,
> &
> Form2.h . The contents of Form1.cpp are :
>
> #include "stdafx.h"
> #include "Form2.h"
> #include <windows.h>
>
> using namespace K1;
>
> int APIENTRY _tWinMain(HINSTANCE hInstance,
> HINSTANCE hPrevInstance,
> LPTSTR lpCmdLine,
> int nCmdShow)
> {
> System::Threading::Thread::CurrentThread->ApartmentState =
> System::Threading::ApartmentState::STA;
> Application::Run(new Form2());
> return 0;
> }
>
> The contents of LabTest 2.h are :
>
> #define MAX_DWELL_SAMPLES 1000
>
> typedef unsigned short ushort;
>
> #pragma pack(1)
>
>
>
> #pragma pack()
>
> /*
> ***********************
> ** Function prototypes
> ***********************
> */
>
>
> int ReadLn(FILE *ifile, char line[]);
>
>
> & the contents of Form2.h are :
>
> #pragma once
> #include <stdio.h>
> #include <windows.h>
> #include <math.h>
> #include <sys/timeb.h>
> #include <time.h>
> #include "LabTest 2.h"
>
>
> namespace K1
> {
>
> using namespace System;
> using namespace System::ComponentModel;
> using namespace System::Collections;
> using namespace System::Windows::Forms;
> using namespace System::Data;
> using namespace System::Drawing;
>
>
> int point_cnt = 0, dwell_samples = 0;
> char ifname[80];
> FILE *sfile;
> char *timeline;
> int i, retries;
> struct _timeb timebuffer;
> BOOL bStatus;
>
>
> /// <summary>
> /// Summary for Form2
> ///
> /// WARNING: If you change the name of this class, you will need to change
> the
> /// 'Resource File Name' property for the managed resource
> compiler tool
> /// associated with all .resx files this class depends on.
> Otherwise,
> /// the designers will not be able to interact properly with
> localized
> /// resources associated with this form.
> /// </summary>
> public __gc class Form2 : public System::Windows::Forms::Form
> {
> public:
> Form2(void)
> {
> InitializeComponent();
> }
>
> protected:
> void Dispose(Boolean disposing)
> {
> if (disposing && components)
> {
> components->Dispose();
> }
> __super::Dispose(disposing);
> }
> private: System::Windows::Forms::Button * button1;
>
>
>
>
>
> private:
> /// <summary>
> /// Required designer variable.
> /// </summary>
> System::ComponentModel::Container* components;
>
> /// <summary>
> /// Required method for Designer support - do not modify
> /// the contents of this method with the code editor.
> /// </summary>
> void InitializeComponent(void)
> {
> this->button1 = new System::Windows::Forms::Button();
> this->SuspendLayout();
> //
> // button1
> //
> this->button1->Location = System::Drawing::Point(112, 112);
> this->button1->Name = S"button1";
> this->button1->Size = System::Drawing::Size(144, 48);
> this->button1->TabIndex = 0;
> this->button1->Text = S"test button";
> this->button1->Click += new System::EventHandler(this, button1_Click);
> //
> // Form2
> //
> this->AutoScaleBaseSize = System::Drawing::Size(5, 13);
> this->ClientSize = System::Drawing::Size(400, 254);
> this->Controls->Add(this->button1);
> this->Name = S"Form2";
> this->Text = S"Form2";
> this->ResumeLayout(false);
>
> }
>
>
> private: System::Void button1_Click(System::Object * sender,
> System::EventArgs * e)
> {
>
> FILE *ifile;
> int ret = FALSE, i, status;
> char line[80];
>
> ifile = fopen(ifname, "rt");
> if (ifile == NULL) printf("Unable to open %s\n", ifname);
> else
> {
> status = ReadLn(ifile, line);
> if (status) sscanf(line, "%d", &dwell_samples);
> if (dwell_samples > MAX_DWELL_SAMPLES) dwell_samples =
> MAX_DWELL_SAMPLES;
>
>
> i = 0;
> status = ReadLn(ifile, line);
> while (status)
> {
> status = ReadLn(ifile, line);
> i++;
> }
> point_cnt = i;
> ret = TRUE;
> }
> fclose(ifile);
>
> }
>
>
> };
>
>
>
>
> int ReadLn(FILE *ifile, char line[])
> {
> int status, i = 0;
> char buffer;
>
> status = fread(&buffer, 1, 1, ifile);
> while ((status) && (buffer != '\n') && (i < 80))
> {
> line[i++] = buffer;
> status = fread(&buffer, 1, 1, ifile);
> }
> line[i] = 0;
>
> return status;
> }
>
> }
>
> Regards,
> ak
>
>
> "Nishant Sivakumar" wrote:
>
>> Have you added the corresponding cpp file to the project?
>>
>> --
>> Regards,
>> Nish [VC++ MVP]
>>
>>
>> "AK" <AK@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
>> news:1A937CBA-CD9C-4AE9-9DA0-217F296111C4@xxxxxxxxxxxxxxxx
>> >I have a .NET application that compiles but has a problem during linking
>> >:
>> >
>> > error LNK2001: unresolved external symbol "int __cdecl ReadLn(struct
>> > _iobuf
>> > *,char * const)" (?ReadLn@@$$FYAHPAU_iobuf@@QAD@Z)
>> >
>> > The ReadLn function prototype is defined in a header file
>> > & is called in another header file.
>> > My compiler options are set to /Gd & /Tp.
>> >
>> > If I do not call the function (& just have it's prototype declared),
>> > then the program links fine.
>> >
>> > When I try to resolve the ambiguity by explicitly calling the function
>> > like namespace::function, I get an error saying that function is not a
>> > member of namespace. This puzzles me since everywhere I look
>> > (Classe View, Intellisense, Context Help) recognizes ReadLn as
>> > a member of the my namespace.
>> >
>> > Why is the linker confused on this function ?
>> >
>> > Regards,
>> > ak
>>
>>
>>


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