I am following a tutorial here for creating a static library and using it for another project. So I want to create a .lib file and use it for another project.
Static library project:
MyMathLib.h
#define PI 3.1415;
double PowerOf2(double UserNumber);
double PowerOf3(double UserNumber);
double CircleArea(double UserRadius);
double CircleCircum(double UserRadius);
MyMathLib.cpp
#include "stdafx.h"
#include "MyMathLib.h"
double PowerOf2(double UserNumber) { return UserNumber * UserNumber; }
double PowerOf3(double UserNumber) { return UserNumber * UserNumber * UserNumber; }
double CircleArea(double UserRadius) { return UserRadius * UserRadius * PI; }
double CircleCircum(double UserRadius) { return 2 * UserRadius * PI; }
For the second project, I have done the following:
Add the MyMathLib vc project
Common Properties -> References -> Add New Reference
C/C++ -> General -> Additional Include Directories.
This is the C file that tries to call the library:
MyApps1.c
#include <stdio.h>
#include "MyMathLib.h"
int main()
{
double p2 = 10.0;
double radius = 4.0;
printf("The number %.2f to the power of 2 is %.2f. \n", p2, PowerOf2(p2));
printf("A circle with a radius of %.2f, the area is %.2f. \n", radius, CircleArea(radius));
return 0;
}
The error I am getting is:
1>------ Build started: Project: MyApps1, Configuration: Debug Win32 ------
1>MyApps1.obj : error LNK2019: unresolved external symbol _PowerOf2 referenced in function _main
1>MyApps1.obj : error LNK2019: unresolved external symbol _CircleArea referenced in function _main
1>c:\users\bandika\documents\visual studio 2013\Projects\MyApps1\Debug\MyApps1.exe : fatal error LNK1120: 2 unresolved externals
========== Build: 0 succeeded, 1 failed, 1 up-to-date, 0 skipped ==========
So there is a linking error somewhere. I have tried going to MyApps1 Properties -> Linker -> Input -> Additional Dependencies but I don't think I can add the .lib file for MyMathLib. Any idea what I'm missing?
Its related to linking of your static lib with the second project.
I don't see any problem in adding your generated static library name in "Configuration Properties -> Linker -> Input -> Additional Dependencies".
It should solve the linking problem.
Are you facing any other problem after using this option?
You do not have the second file added to the project in the VS.
Related
I am trying to use Blaze C++ Library so I downloaded this library and successfully added to my project and used basic functionalities , but for extra functionalities I have to add BLAS and LAPACK library too. so i downloaded these packages .lib and .dll files. I did these:
1 - Project >> Linker >> General >> Additional Library Directories : I defined the path contains .dll files
2 - Project >> Linker >> Input >> Additional Dependencies : I defined the path contains .lib files
but when I try below code I receive some errors:
Code
#include <iostream>
#include <blaze/Math.h>
using namespace blaze;
using namespace std;
int main()
{
StaticMatrix<double,100,100> A;
for (size_t i = 0; i < 100; i++)
{
for (size_t j = 0; j < 100; j++)
{
A(i, j) = i + j;
}
}
blaze::DynamicMatrix<double, blaze::rowMajor> L, U, P;
lu(A, L, U, P);
}
Errors
1 - Severity Code Description Project File Line Suppression State
Error LNK2019 unresolved external symbol dgetrf_ referenced in function "void __cdecl
blaze::getrf(int,int,double *,int,int *,int *)" (?getrf#blaze##YAXHHPEANHPEAH1#Z) MyProject
D:\C++\MyProject \MyProject \MyProject.obj 1
2 - Severity Code Description Project File Line Suppression State
Error LNK1120 1 unresolved externals MyProject D:\C++\MyProject\x64\Debug\MyProject.exe 1
what should have I do ?
I've added opencv_world400.lib and opencv_world400d.lib to the dependencies, but I'm still getting this error in MSVS2017:
1>------ Build started: Project: OpenCLTest, Configuration: Release x64 ------
1>OpenCLTest.obj : error LNK2001: unresolved external symbol "int __cdecl cv::_interlockedExchangeAdd(int *,int)" (?_interlockedExchangeAdd#cv##YAHPEAHH#Z)
1>c:\users\chubak\documents\visual studio 2017\Projects\OpenCLTest\x64\Release\OpenCLTest.exe : fatal error LNK1120: 1 unresolved externals
1>Done building project "OpenCLTest.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
There were no other lib files in the folder, just those two. What causes this problem I don't know.
Here's the code:
#include "stdafx.h"
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
using namespace std;
using namespace cv;
int main()
{
Mat image = imread("C:\\Users\\Chubak\\Pictures\\index.jpg");
if (image.empty())
return -1;
imshow("TEST", image);
waitKey();
return 0;
}
3 steps:
1. C++ -> General -> Additional Include Directories
2. Linker -> Input -> Additional Dependencies
3. Linker -> General -> Additional Include Directories
I am trying to create a CUDA + C++ project. Basically a .cpp project that calls for some CUDA kernel. So I simply followed the example here, which basically adds two vectors. The kernel does the summation job:
http://blog.norture.com/2012/10/gpu-parallel-programming-in-vs2012-with-nvidia-cuda/
Here is the code,
#include <iostream>
#include "cuda_runtime.h"
#include "cuda.h"
#include "device_launch_parameters.h"
using namespace std;
__global__ void saxpy(int n, float a, float *x, float *y)
{
int i = blockIdx.x*blockDim.x + threadIdx.x;
if (i < n) y[i] = a*x[i] + y[i];
}
int main(void)
{
int N = 1<<20;
float *x, *y, *d_x, *d_y;
x = (float*)malloc(N*sizeof(float));
y = (float*)malloc(N*sizeof(float));
cudaMalloc(&d_x, N*sizeof(float));
cudaMalloc(&d_y, N*sizeof(float));
for (int i = 0; i < N; i++) {
x[i] = 1.0f;
y[i] = 2.0f;
}
cudaMemcpy(d_x, x, N*sizeof(float), cudaMemcpyHostToDevice);
cudaMemcpy(d_y, y, N*sizeof(float), cudaMemcpyHostToDevice);
// Perform SAXPY on 1M elements
saxpy<<<(N+255)/256, 256>>>(N, 2.0, d_x, d_y);
cudaMemcpy(y, d_y, N*sizeof(float), cudaMemcpyDeviceToHost);
float maxError = 0.0f;
for (int i = 0; i < N; i++)
maxError = max(maxError, abs(y[i]-4.0f));
cout << "Max error: " << maxError;
}
When I built I got this error:
1>------ Rebuild All started: Project: CUDATest001, Configuration: Debug x64 ------
1> CUDATestZeroZeroOne.cpp
1>CUDATestZeroZeroOne.obj : error LNK2001: unresolved external symbol threadIdx
1>CUDATestZeroZeroOne.obj : error LNK2001: unresolved external symbol blockIdx
1>CUDATestZeroZeroOne.obj : error LNK2001: unresolved external symbol blockDim
1>D:\Projects\CUDATest001\x64\Debug\CUDATest001.exe : fatal error LNK1120: 3 unresolved externals
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========
If the line saxpy<<<(N+255)/256, 256>>>(N, 2.0, d_x, d_y); is commented out, then this error appeared:
1>------ Rebuild All started: Project: CUDATest001, Configuration: Debug x64 ------
1> CUDATestZeroZeroOne.cpp
1>CUDATestZeroZeroOne.obj : error LNK2001: unresolved external symbol threadIdx
1>CUDATestZeroZeroOne.obj : error LNK2001: unresolved external symbol blockIdx
1>CUDATestZeroZeroOne.obj : error LNK2001: unresolved external symbol blockDim
1>D:\Projects\CUDATest001\x64\Debug\CUDATest001.exe : fatal error LNK1120: 3 unresolved externals
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========
I am using vs2012 + CUDA 5.5. I started with a empty C++ win32 console project, added a .cpp file which includes all the code above. I am not even sure at this point should it be a .cu or a .cpp file?
Anyone has any idea how to make this work? Thanks.
In the context menu for your project, click Build Customizations. Turn on the CUDA 5.5 target.
In the context menu for your .cpp file, click Rename and rename it to .cu.
In the context menu for your .cu file (that you just renamed), select Properties. Then go to General and make sure Item Type is set to CUDA C/C++.
Rebuild.
When you start a new CUDA project, you can select Templates > NVIDIA > CUDA 5.5 > CUDA 5.5 Runtime to get a project that should compile without any modifications.
EDITED:
My Problem is the errors at the bottom of this post.
Heres my additional include directories
C:\Program Files\boost
C:\Program Files\MySQL\MySQL Connector C++ 1.1.3\include
C:\Program Files\MySQL\MySQL Server 5.6\include
Additional Library Directories
C:\Program Files\MySQL\MySQL Server 5.6\lib
C:\Program Files\MySQL\Connector C++ 1.1.2\lib\opt
Additional Dependencies
libmysql.lib
mysqlcppconn-static.lib
Heres my code
#include <iostream>
#include <cstdio>
#include <cstdlib>
using namespace std;
#include <stdlib.h>
#include <Windows.h>
#include <mysql.h>
#include "mysql_connection.h"
#include <cppconn/driver.h>
#define host "localhost"
#define username "root"
#define password "root"
#define database "tests"
int main()
{
MYSQL* conn;
conn = mysql_init( NULL );
if( conn )
{
mysql_real_connect( conn, host, username, password, database, 0, NULL, 0 );
}
MYSQL_RES* res_set;
MYSQL_ROW row;
unsigned int i;
mysql_query( conn, "SELECT * FROM tbl_clients WHERE id = 1" );
res_set = mysql_store_result( conn );
unsigned int numrows = mysql_num_rows( res_set );
if( numrows )
{
row = mysql_fetch_row( res_set );
if( row != NULL )
{
cout << "Client ID : " << row[0] << endl;
cout << "Client Name: " << row[1] << endl;
}
}
if( res_set )
{
mysql_free_result( res_set );
}
if( conn )
{
mysql_close( conn );
}
return 0;
}
These are the errors I get
1>------ Build started: Project: okay, Configuration: Debug Win32 ------
1>welp.obj : error LNK2019: unresolved external symbol _mysql_num_rows#4 referenced in function _main
1>welp.obj : error LNK2019: unresolved external symbol _mysql_init#4 referenced in function _main
1>welp.obj : error LNK2019: unresolved external symbol _mysql_real_connect#32 referenced in function _main
1>welp.obj : error LNK2019: unresolved external symbol _mysql_query#8 referenced in function _main
1>welp.obj : error LNK2019: unresolved external symbol _mysql_store_result#4 referenced in function _main
1>welp.obj : error LNK2019: unresolved external symbol _mysql_free_result#4 referenced in function _main
1>welp.obj : error LNK2019: unresolved external symbol _mysql_fetch_row#4 referenced in function _main
1>welp.obj : error LNK2019: unresolved external symbol _mysql_close#4 referenced in function _main
1>C:\Users\Damian\documents\visual studio 2012\Projects\okay\Debug\okay.exe : fatal error LNK1120: 8 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Please help, This project is due in about 48 hours for my class, and I've spent so much time trying to figure this out.
Thanks
respectfully, your last two questions are compiler/linker questions. I understand your frustration, as I knew how to code early but knew nothing about compilers/linkers. When you get a moment take some time to read about:
headers
binary vs object file
libraries / shared object
compiler
linker
function mangling (C vs C++)
To answer your question, I am guessing you're doing this in Microsoft Visual Studio:
You need to go to Project Properties and set Additional Library Paths (i see you did that from your last post)
You need to specify the library, I'm going out on a limb here and assuming it will mysql.lib ... There's an "Additional Library" input somewhere in the Linker section, you'll be able to identify it because kernel32.lib will be int it. Add the mysql.lib to that section. Confirm the name by going to the mysql folder which holds the binaries.
Make sure you're using the static library, the .dll will give you new issues that you don't need to worry about. This is usually achieved by setting the correct library directory. Many c++ libraries will ship with precompiled "Static" and "Dynamic" folders containing the correct libraries.
This is error is happening due to linker problem. The linker is not able to find the required static or dynamic libraries (mysql.lib,mysqlcppconn-static.lib,libmysql.dll and libmysql.lib). The additional lib setting is wrong. Check this site give the path correctly Building MySQL Connector/C++ Windows Applications with Microsoft Visual Studio
Ok, so I'm having a problem trying figure out the problem in my code. I have a lot of code so I'm only going to post the relevant parts that are messing up when I compile. I have the following function inside of a class and it will compile and everything will run fine until I call the function "CalculateProbabilityResults" and it runs the 7th line of code within it. I've "de-commented" this line of code in my program so you can find it easier. I'm pretty sure I have the right #include directives needed since it compiles fine when not calling the function, so that can't be the problem can it? I know some of my naming notation needs a little help, so please bear with me. Thanks in advance for the help guys.
int SQLServer::CalculateProbabilityResults(int profile, int frame, int time_period, int TimeWindowSize) {
ofstream ResultFile;
stringstream searchFileName;
stringstream outputName;
vector<vector<int>> timeFrameItemsets;
int num = getTimeFrameFile(frame*TimeWindowSize, TimeWindowSize);
cout << num << endl;
//outputName << "Results" << getTimeFrameFile((frame*TimeWindowSize), TimeWindowSize) << ".csv";
cout << outputName.str() << endl;
outputName.clear();
//ResultFile.open(outputName.str().c_str());
ResultFile.close();
result.resize(0);
return 0;
}
int getTimeFrameFile(int timeInHours, int timeFrameSize) {
int fileNum = 0;
int testWin;
if (timeInHours > 24) {
while (timeInHours >24)
timeInHours -= 24;
}
for (testWin = 0; testWin < 24/timeFrameSize; testWin++) {
if (timeInHours >= testWin*timeFrameSize && timeInHours < (testWin+1)*timeFrameSize)
fileNum = testWin+1;
}
if (fileNum == 0)
fileNum = testWin+1;
return fileNum;
}
Call Log
1>------ Rebuild All started: Project: MobileSPADE_1.3, Configuration: Debug Win32 ------
1>Deleting intermediate and output files for project 'MobileSPADE_1.3', configuration 'Debug|Win32'
1>Compiling...
1>main.cpp
1>MobileSPADE.cpp
1>SQLServer.cpp
1>Generating Code...
1>Compiling manifest to resources...
1>Microsoft (R) Windows (R) Resource Compiler Version 6.0.5724.0
1>Copyright (C) Microsoft Corporation. All rights reserved.
1>Linking...
1>LINK : C:\Users\JoshBradley\Desktop\MobileSPADE_1.3\MobileSPADE_1.3\Debug\MobileSPADE_1.3.exe not found or not built by the last incremental link; performing full link
1>SQLServer.obj : error LNK2019: unresolved external symbol "public: int __thiscall SQLServer::getTimeFrameFile(int,int)" (?getTimeFrameFile#SQLServer##QAEHHH#Z) referenced in function "public: int __thiscall SQLServer::CalculateProbabilityResults(int,int,int,int)" (?CalculateProbabilityResults#SQLServer##QAEHHHHH#Z)
1>C:\Users\JoshBradley\Desktop\MobileSPADE_1.3\MobileSPADE_1.3\Debug\MobileSPADE_1.3.exe : fatal error LNK1120: 1 unresolved externals
1>Build log was saved at "file://c:\Users\JoshBradley\Desktop\MobileSPADE_1.3\MobileSPADE_1.3\MobileSPADE_1.3\Debug\BuildLog.htm"
1>MobileSPADE_1.3 - 2 error(s), 0 warning(s)
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========
The compiler thinks that getTimeFrameFile is a SQLServer method:
unresolved external symbol "public: int __thiscall SQLServer::getTimeFrameFile(int,int)"
but you have it defined as a free function:
int getTimeFrameFile(int timeInHours, int timeFrameSize) {
Change that from a free function to a class method will solve the problem:
int SQLServer::getTimeFrameFile(int timeInHours, int timeFrameSize)
Put the function getTimeFrameFile above SQLServer::CalculateProbabilityResults.