I just tried setting up curl for the first time using windows + mingw + eclipse juno + curl 7.29. I managed to get it to compile and build fine. I've added the two flags for lcurl and lcurldll.
For some reason though the following does not work:
#include <iostream>
#include <curl.h>
using namespace std;
int main(int argc,char *argv[]) {
cout << "L1" << endl;
CURL *curl;
curl = curl_easy_init();
cout << "L2" << endl;
}
Neither L1 nor L2 will print. If I comment out the easy_init line though it runs fine.
I can't seem to find any similar posts, sorry if this is a dupe. Also, I can't step into anything as it dies as soon as I hit run. I'm sure its something obvious.
Thanks in advance.
Eclipse IDE for C/C++ Developers Version: Juno Service Release 1
Build id: 20120920-0800
curl version: 7.29.0 - SSL enabled
URL: http://curl.haxx.se/gknw.net/7.29.0/dist-w32/curl-7.29.0-devel-mingw32.zip
as for mingw not sure which version I have, I just went to http://sourceforge.net/projects/mingw/files/ and downloaded / installed the latest ver.
In eclipse, under MinGW C++ linker, I have curl and curldll for libraries. In misc I have the static flag - those are the only compiler settings I have changed.
It does work for me, but i just had to add system("PAUSE") at the end since the console close before i can see anything.
here's my code :
#include <curl.h>
#include <iostream>
using namespace std;
int main(void)
{
cout << "L1" << endl;
CURL *curl;
curl = curl_easy_init();
cout << "L2" << endl;
system("PAUSE");
return 0;
}
If you get the message "cannot open include file: 'curl.h': no such file or directory" or something like that, this is because you've missed something in the installation of curl.
It took me a long time to install it.
Related
I'm new to C++, and am developing for Arduino with PlatformIO & VS Code on MacOS 11.6.5.
Following the PlatformIO docs I have set up a simple test like this:
#include <unity.h>
#include <iostream>
void test_something()
{
std::cout << "Test running..." << std::endl;
TEST_ASSERT_TRUE(true);
}
int main(int argc, char **argv)
{
UNITY_BEGIN();
RUN_TEST(test_something);
UNITY_END();
}
When I run platformio test --environment local I see the test results in the terminal, but not the output of std::cout.
(I found an example of printing to cout from tests when not using PlatformIO, and the PlatformIO repo has lots of test examples, but none of these seem to involve cout.)
Also VS Code IntelliSense complains 'cannot open source file "iostream"', but I'm guessing this is unrelated as PlatformIO seems to have no problems compiling it.
Any pointers appreciated!
Ok, thanks to #Ulrich Eckhardt's help it turns out I just needed to specify --verbose mode for Unity i.e.:
platformio test --environment local --verbose
Then there are a whole bunch of ways to write to the terminal:
cout << "Hello" << endl;
cout << "Hello\n";
fprintf(stdout, "Hello");
putchar('a');
There are also Unity print methods, not sure of the pros & cons of these:
UnityPrint("Hello");
UnityPrintLen("Print this, but not this", 10);
UNITY_OUTPUT_CHAR('a');
I am trying to use OCCI to connect my program to an oracle database but I am getting an SQLException 32104 when I try the createEnvironment function.
My code:
#include <OpenXLSX.hpp>
#include <occi.h>
#include <string>
using namespace OpenXLSX;
using namespace oracle::occi;
int main() {
std::string user = "";
std::string pass = "";
std::string conn_str = "(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.2.159)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=test)))";
std::cout << "Initializing Database Connection ......" << std::endl;
try {
Environment* env = Environment::createEnvironment(Environment::DEFAULT);
//Connection *conn = env->createConnection(user, pass ,conn_str);
} catch(SQLException &e) {
std::cout << "Error Message: " << e.getErrorCode() << std::endl;
std::cout << e.getMessage() << std::endl;
}
std::cout << "Initializing Database Connection ......";
std::cout << " OK" << std::endl;
XLDocument doc;
doc.open("Template.xlsx");
auto wks = doc.workbook().worksheet("Extruder Data Log");
int row_number = 4;
char column_letter = 'A';
char column_letter2 = 'A';
std::string loc;
loc = column_letter;
loc += std::to_string(4);
wks.cell(loc).value() = "Hello, OpenXLSX!";
doc.save();
//env->terminateConnection(conn);
//Environment::terminateEnvironment(env);
std::cout << "Program Terminated: Press Enter ...";
std::string wait;
std::cin >> wait;
return 0;
}
I am using CMake to compile:
cmake_minimum_required(VERSION 3.15)
project(Atlas)
set(CMAKE_CXX_STANDARD 17)
# Set the build output location to a common directory
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/output)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/output)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/output)
set(CMAKE_PREFIX_PATH ${CMAKE_CURRENT_SOURCE_DIR}/include/lib)
add_subdirectory(OpenXLSX)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include/include/OpenXLSX/headers)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include/include/OpenXLSX)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include/include/OCCI)
link_directories(${CMAKE_PREFIX_PATH})
find_package(OpenXLSX REQUIRED)
find_library(OCCI NAMES oraocci21.lib oci.lib oramysql.lib oraocci21d.lib ociw32.lib)
add_executable(Atlas Atlas.cpp)
target_link_libraries(Atlas OpenXLSX::OpenXLSX)
target_link_libraries(Atlas ${OCCI})
I have the dlls in the output directory where the executable and libraries end up outputting to.
I figure that it should run, but I am getting a Microsoft C++ exception: oracle::occi::SQLException
and on debugging it shows that it is message 32104 which I know means that it cannot get the error.
The Debug window show that it loads the oraocci21.dll but not any of the other OCCI dlls.
If anyone can let me know what I'm doing wrong I would be incredibly grateful since I have scoured the internet trying to figure this out.
EDIT
Figured out this error, I hadn't moved all of the dlls from the instant client. I was only including the dlls that corresponded to the library names.
I included ocijdbc21.dll, orannzsbb.dll, and oraociicus.dll to the folder with my executable and it now runs past the createEnvironment(Environment::DEFAULT) part.
With this edit, though, I am now running into Error 24960 which says that OCI_ATTR_USERNAME is more than length 255 which it is not.
If anyone can help with that please let me know but I hope that anyone else running across this who needs help sees the part about the dlls.
If it helps to answer my question, I am using instant client base 21_3 and sdk 21_3. I am also using MSVC 16 2019 for compilation with C++17 as the version of C++. My Oracle Database is running on 19c and I can connect to it remotely.
So I figured it out.
I was using this command for cmake:
cmake --build . --target ALL_BUILD --config Debug
This release config command should work because I have debugged the program:
cmake --build . --target ALL_BUILD --config Release
For some reason, I can only assume that OCCI did not like my debugger
version or something like that. If someone could please comment on why this happens I would like to learn.
I am running just a little code using libsndfile, in the emscripten environment
#include <iostream>
#include <sndfile.h>
int main()
{
SF_INFO info;
const char * path = "~/data/somefile.wav";
SNDFILE* sf = sf_open(path,SFM_READ, &info);
if(sf == NULL)
{
std::cout<< sf_strerror(sf) << std::endl;
return 1;
}
std::cout<<info.samplerate<<std::endl;
std::cout<<"Hello world" << std::endl;
}
So ideally if I run this with normal cmake (Apple Clang compiler) everything works fine, the samplerate and hello world are printed, but when I run this with emcmake cmake (em++ compiler) and run the compiled node main.js file it says System error: no such file or directory. Who can help me with this? Who has experienced such thing?
So I figured it out.
The problem is that Emscripten has its virtual file environment. So if you want this file to be uploaded and later be seen in compiled .js file, you need to add compile flag --preload-file <FILE_PATH> , after that the file with given path will be recognized by emscripten environment.
I am working on Windows and I am trying to write an array into a Ubuntu device using C++ in Visual Studio 2019. Here's a sample of my code:
int Run_WriteCalibTable(char *pcIPAddress, int iNumArgs, float *fArgs, int *iAnsSize, char *sAns)
...
...
...
char pcFolderName[256];
char pcFileName[256];
sprintf(pcFolderName, "%s\\%s",pcSavePath, pcUUTSerialNumber);
sprintf(pcFileName, "%s\\calib_rfclock.conf",pcFolderName);
// WRITE TABLE ON PC
FILE *pFileW;
pFileW = fopen(pcFileName,"wb");
fwrite(&CalibTable, sizeof(char), CalibTable.hdr.v1.u32Len, pFileW);
fclose(pFileW);
}
return 0;
However, I keep having this pop-up from Microsoft Visual C++ Debug Library that says:
Debug Assertion Failed:
Program:...
File: f:\dd\vctools\crt_bld\sefl_x86\crt\src\fwrite.c
Line: 77
Expression: (stream != NULL)
...
I found this thread and I tried logging in as root on my Ubuntu device. I also tried:
mount -o remount,rw /path/to/parent/directory
chmod 777 /path/to/parent/directory
And I can also create/edit manualy any file in the directory I'm trying to write into with my code, but I get the same error when running it.
Anyone knows what could cause this? I think it could be on the Windows side, but I don't know what I am doing wrong. Thanks a lot in advance.
You never check that opening the file succeeds - and it most likely fails, which is why you get the debug pop-up. Your use of \ as directory delimiters may be the only reason why it fails, but you should check to be sure.
I suggest that you use std::filesystem::path (C++17) to build your paths. That makes it easy to create paths in a portable way. You could also make use of a C++ standard std::ofstream to create the file. That way you don't need to close it afterwards. It closes automatically when it goes out of scope.
Example:
#include <cerrno>
#include <cstring>
#include <filesystem>
#include <fstream>
int Run_WriteCalibTable(char *pcIPAddress, int iNumArgs, float *fArgs,
int *iAnsSize, char *sAns)
{
...
// Build std::filesystem::paths:
auto pcFolderName = std::filesystem::path(pcSavePath) / pcUUTSerialNumber;
auto pcFileName = pcFolderName / "calib_rfclock.conf";
// only try to write to the file if opening the file succeeds:
if(std::ofstream pFileW(pcFileName, std::ios::binary); pFileW) {
// Successfully opened the file, now write to it:
pFileW.write(reinterpret_cast<const char*>(&CalibTable),
CalibTable.hdr.v1.u32Len);
} else {
// Opening the file failed, print the reason:
std::cerr << pcFileName << ": " << std::strerror(errno) << std::endl;
}
...
}
I have installed OpenCv with Homebrew on my MacOs. I have added libopencv 4.0.1.dylib in Xcode. When I try to build, Xcode cannot find the files. Any suggestions?
I changed my path but still have problems.
Main code:
#include <iostream>
#include <opencv4/opencv2/opencv.hpp>
int main(int argc, const char * argv[]) {
// insert code here...
std::cout << "Hello, World!\n";
return 0;
}
Build settings including path:
Error messages: