C++ ellipsis example - Windows ShowErrorMessage

example.cpp

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <Windows.h>


void ShowErrorMessage(const char* format, ...);
void vShowErrorMessage(const char* format, va_list argp);

int main()
{
	ShowErrorMessage("An error occurred!");
	return 1;
}

void ShowErrorMessage(const char* format, ...)
{
	va_list argp;
	va_start(argp, format);
	vShowErrorMessage(format, argp);
	va_end(argp);
}

void vShowErrorMessage(const char* format, va_list argp)
{
	char errorMessage[4096];
	snprintf(errorMessage, sizeof(errorMessage), format, argp);
	MessageBox(NULL, errorMessage, "Error", MB_OK | MB_ICONERROR);
}

ShowErrorMessage.cpp

void ShowErrorMessage(const char* format, ...)
{
	va_list argp;
	va_start(argp, format);
	vShowErrorMessage(format, argp);
	va_end(argp);
}

void vShowErrorMessage(const char* format, va_list argp)
{
	char errorMessage[4096];
	snprintf(errorMessage, sizeof(errorMessage), format, argp);
	MessageBox(NULL, errorMessage, "Error", MB_OK | MB_ICONERROR);
}