app_launch/source/main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <3ds.h>
 
int main()
{
    gfxInitDefault();
    consoleInit(GFX_TOP, NULL);
 
    printf("APT chainload example\n");
    printf("Press A to chainload to EUR camera app\n");
    printf("Press START to exit\n");
 
    while (aptMainLoop())
    {
        gspWaitForVBlank();
        gfxSwapBuffers();
        hidScanInput();
 
        u32 kDown = hidKeysDown();
 
        if (kDown & KEY_START)
            break;
 
        if (kDown & KEY_A) // If the A button got pressed, start the app launch
        {
            aptSetChainloader(0x0004001000022400LL, 0); // *EUR* camera app title ID
            break;
        }
    }
 
    gfxExit();
    return 0;
}