C / C++ / MFC

struct sq
{
    int nbytes;
// any other items
    byte queueItems[1];
}

readDataResultCallback

void OnState1(uint8_t* readData, uint16_t sizeOfReadData) 
{
...
}

stateMachineStep_s stateMachineSteps[3] = {
{STATE1,    10, 2, &OnState1} 
...
}

Josh Gray2 wrote:

which, to be honest, is not significantly more typing

Josh Gray2 wrote:

If you don't have c++11 support the boost library offers a similar function pointer but without the nicer lambda syntax.

Josh Gray2 wrote:

C++11 and greater support lambda expressions which will allow you to initialise your structs with a similar syntax to your example but in that case you would have to swap your function pointer to an std::function<> type.

arnold_w wrote:

Could someone knowledgeable in C++ please help with the syntax for the example I provided? Do I need to put it inside a C++ file or it is possible have sections of a C-file containing C++ code?

#include <functional>
#include <iostream>
using namespace std;

using MyCallback = function <void(const char * p, const size_t size)>;

struct State
{
  int i;
  MyCallback mc;
};


State s[] =
{
  { 10, [](const char * p, size_t size ){ for (size_t n=0; n<size; ++n) cout << p[n];}}
};


int main()
{

  cout << s[0].i << endl;

  s[0].mc( "foo", 3);

  cout << endl;

}

${COMMAND} ${FLAGS} ${OUTPUT_FLAG} ${OUTPUT_PREFIX}${OUTPUT} ${INPUTS}

arm-none-eabi-g++ -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 -T"" -Wl,-Map,output.map -Wl,--gc-sections -fno-exceptions -fno-rtti -o "MyProject.elf" @"objects.list"   -lm

Invoking: MCU G++ Linker
arm-none-eabi-g++ -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 -T"" -Wl,-Map,output.map -Wl,--gc-sections -fno-exceptions -fno-rtti -o "MyProject.elf" @"objects.list"   -lm -lm
c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.17.0.201812190825/tools/compiler/bin/../lib/gcc/arm-none-eabi/7.3.1/../../../../arm-none-eabi/bin/ld.exe: cannot open linker script file -Wl,-Map,output.map: No such file or directory

arnold_w wrote:

What did I do wrong?

myprog.exe

#include <iostream>

int main (int argc, char * argv []) {
	
	int itr = 0;

	if (argc > 0) {
		while (itr <= argc) {
			std::cout << argv[itr] << std::endl;
			++itr;
		}
	}

	std::cin.ignore(std::numeric_limits<int>::max(), '\n');
	std::cout << "press ENTER to close program.";
	std::cin.get();
	return 0;
}

C:\Users\user1\Documents\Code\C++>Test.exe
argc = 1
argv[0] = Test.exe

C:\Users\user1\Documents\Code\C++>C:\Users\user1\Documents\Code\C++\Test
argc = 1
argv[0] = C:\Users\user1\Documents\Code\C++\Test

C:\Users\user1\Documents\Code\C++>Test.exe one two "three and a half"
argc = 4
argv[0] = Test.exe
argv[1] = one
argv[2] = two
argv[3] = three and a half

std::cout << "argc = " << argc << std::endl;
for (int i = 0; i < argc; ++i)
{
    std::cout << "argv[" << i << "] = " << argv[i] << std::endl;
}

Test check \foo\bar\filename.txt
Test -c C:\user1\Documents\file.jpg
Test --check somefilename

... etc.

#include <iostream>

int main (int argc, char * argv []) {

	if (argc > 1) {
		std::cout << argv[1] << std::endl;
	}

	std::cin.ignore(std::numeric_limits<int>::max(), '\n');
	std::cout << "press ENTER to close program.";
	std::cin.get();
	return 0;
}

seotutorialszone wrote:

what is best resource to learn python language