My program has to quit when I press ESC key. Even not pressing the key, my program exit automatically after some seconds of execution. No errors or notable exceptions found during the execution and the code seems to be correct.
void pollE(bool& _isRunning, build *actionBuild,finance *money,squareId* slotId,squareId map[][MAP_SLOTS_H]) {
while (SDL_PollEvent(&event)) {
// MOUSE
switch (event.button.button) {
case SDL_BUTTON_LEFT:
if (event.button.state == SDL_RELEASED) {
actionBuild->construct(ID_CASA, map);
}
if (event.button.state == SDL_PRESSED) {
}
break;
case SDL_BUTTON_RIGHT:
if (event.button.state == SDL_RELEASED) {
// test
debugPrintMap(map);
}
if (event.button.state == SDL_PRESSED) {
}
break;
}
// KEYBOARD
switch (event.key.keysym.sym) { // ---------------------------- HERE
case SDLK_ESCAPE: // ------------------------------------------ HERE
_isRunning = false; // ------------------- to stop mainLoop()
break;
case SDLK_SPACE:
break;
default:
break;
}
}
The function is called here:
void mainLoop() {
(...)
while (isRunning == true) {
dealWithEvents->pollE(isRunning,actionBuild,money,slotId,map);
preDraw();
draw();
afterDrawEffects();
draw();
(...)
}
(...)
}
I first added an infinite loop. Dugme is a variable for loop. But I couldn't break the loop. That’s why, when I enter the loop, I can’t exit.
void otoac()
{
long duration, distance;
while(dugme==1)
{
int distanceR = 0;
int distanceL = 0;
delay(40);
if(distance<=24)
{
moveStop();
delay(100);
moveBackward();
delay(300);
moveStop();
delay(200);
distanceR = lookRight();
delay(200);
distanceL = lookLeft();
delay(200);
if(distanceR>=distanceL)
{
turnRight();
moveStop();
}
else
{
turnLeft();
moveStop();
}
}
else
{
moveForward();
}
distance = readPing();
}
}
I have an code that when I click on case:'X' it goes in automatic mode (application). I have here the code for when I click out of 'X' that's 'x' (little x) it needs to stop but it doesn't stop. This is the code for the 'x'.
void otokapa()
{
dugme=0
motor1.setSpeed(0);
motor2.run(RELEASE); //turn motor1 off
motor2.setSpeed(0);
motor2.run(RELEASE); //turn motor2 off
}
Someone on YouTube only gave me this answer:
I added a while loop to the command, as well as a contradiction to the command, meaning, the action that the car will do when the triangle is not pressed, which is nothing.
More code:
void loop(){
if(Serial.available() > 0){
command = Serial.read();
Stop();
switch(command){
case 'F':
forward();
break;
case 'B':
back();
break;
case 'L':
left();
break;
case 'R':
right();
break;
case 'G':
onsol();
break;
case 'I':
onsag();
break;
case 'H':
arkasag();
break;
case 'J':
arkasol();
break;
case 'W':
onac();
break;
case 'w':
onkapa();
break;
case 'X':
otoac();
break;
case 'x':
otokapa();
break;
}
}
}
and dugme:
on top of all the code int dugme=1; and dugme is only in void otokapa and in otoac while(dugme==1)
Is this in essence what your problem looks like?
int dugme = 1; // one and only definition of this (ODR)
void otoac() {
long duration, distance;
while(dugme==1) {
}
}
void otokapa() {
dugme=0;
}
void loop(){
if(Serial.available() > 0){
command = Serial.read();
Stop();
switch(command){
case 'X':
otoac();
break;
case 'x':
otokapa();
break;
}
}
}
Possible errors violation of ODR.
if loop and otoac runs in the same thread you will never get to the serial again.
for using arrow keys, first it has to be stored for analyzing it. That's why I am using scanf to store it.
But when I try to run this code, and when I press up key, then it is showing ^[[A and when I press enter then this ^[[A removes and program exit without printing printf statement of printf("%s",c). and printf("UP\n").
#include <stdio.h>
int main()
{
char c[50];
scanf("%s",&c);
printf("%s",c);
if (getch() == '\033'){ // if the first value is esc
getch();// skip the [
getch();// skip the [
switch(getch()) { // the real value
case 'A':
printf("UP\n");
break;
case 'B':
printf("DOWN\n");
break;
}
}
return 0;
}
You will find it easy if you use the ncurses library. Just go through the documentation to see how to install it.
After installing read the part on Interfacing with the key board
Here is a sample code
#include <ncurses.h>
int main()
{
int ch;
initscr();
raw();
keypad(stdscr, TRUE);
noecho();
while(1)
{
ch = getch();
switch(ch)
{
case KEY_UP:
printw("\nUp Arrow");
break;
case KEY_DOWN:
printw("\nDown Arrow");
break;
case KEY_LEFT:
printw("\nLeft Arrow");
break;
case KEY_RIGHT:
printw("\nRight Arrow");
break;
}
if(ch == KEY_UP)
break;
}
endwin();
}
Hey so I'm working on a project/2d game and I'm having some odd behavior from SDL which I'm sure is probably something I'm not understanding. The function ProcessKeys is called and works fine for all the key press downs except SDLK_SPACE and I cannot for the life of me figure out why.
What is even more bizarre is that the SDL_KEYUP switch of SDLK_SPACE works great. I tried using some debugging code to print out which key is being pressed and when you press space down nothing registers. Every other key on the keyboard registers in my debug statement at the top of the SDL_KEYDOWN case.
If anyone can see what is going on I would really appreciate it.
And if you need to see where its being called let me know.
SDLKeyboard::KeyState SDLKeyboard::ProcessKeys(SDL_Event * event)
{
switch(event->type)
{
/* Look for a keypress */
case SDL_KEYDOWN:
{
std::cout << "Key currently pressed" << event->key.keysym.sym << std::endl;
/* Check the SDLKey values and move change the coords */
switch(event->key.keysym.sym)
{
case SDLK_LEFT:
{ // rotate the ship left
c.setIsTurningLeft(true);
return this->keystate = LeftPressed;
// add code when user presses left
break;
}
case SDLK_RIGHT:
{
// rotate the ship right
c.setIsTurningRight(true);
return this->keystate = RightPressed;
// add code when user presses right
break;
}
case SDLK_UP:
{
// accleration
c.setIsAccelerating(true);
return this->keystate = UpPressed;
// add code when user presses up
break;
}
case SDLK_SPACE:
{
// shoot
c.setIsShooting(true);
std::cout << "keystate = " << this->keystate;
return this->keystate = SpacePressed;
// add code when user presses space
break;
}
default:
{
return this->keystate = NotPressed;
break;
}
}
break;
}
/* We must also use the SDL_KEYUP events to zero the x */
/* and y velocity variables. But we must also be */
/* careful not to zero the velocities when we shouldn't*/
case SDL_KEYUP:
{
std::cout << "Key currently pressed" << event->key.keysym.sym << std::endl;
switch(event->key.keysym.sym)
{
case SDLK_LEFT:
{ /* We check to make sure the ship is moving */
/* to the left. If it is then we zero the */
/* velocity. If the ship is moving to the */
/* right then the right key is still press */
/* so we don't touch the velocity */
c.setIsTurningLeft(false);
return this->keystate = LeftReleased;
// code to do things when left isn't pushed anymore but still moving left
break;
}
case SDLK_RIGHT:
{ // code to do things when right isn't pushed anymore but still moving right
c.setIsTurningRight(false);
return this->keystate = RightReleased;
break;
}
case SDLK_UP:
{ // code to do things when up isn't pushed anymore but still moving up
c.setIsAccelerating(false);
return this->keystate = UpReleased;
break;
}
case SDLK_SPACE:
{ // accleration
c.setIsShooting(false);
return this->keystate = SpaceReleased;
// add code when user presses up
break;
}
default:
break;
}
break;
}
default:
{
return this->keystate = NotPressed;
break;
}
}
}
EDIT:
Here is the example requested. The other thing that I've noticed is the latency in response isn't that great. Like if you press a key sometimes the console doesn't print the corresponding key. Probably has to do with the issue I'm having with the space as well.
void GUI::TakeInput(SDL_Event *e)
{
while (SDL_PollEvent(e))
OnEvent(e);
}
void SDLEvent::OnEvent(SDL_Event * event)
{
switch(event->type)
{
case SDL_KEYDOWN:
{
OnKeyDown(event->key.keysym.sym);
break;
}
case SDL_KEYUP:
{
OnKeyUp(event->key.keysym.sym);
break;
}
case SDL_MOUSEMOTION:
{
OnMouseMove(event->motion.x,event->motion.y);
break;
}
case SDL_MOUSEBUTTONDOWN:
{
OnMouseButtonDown(event->button.button, event->button.x,event->button.y);
break;
}
case SDL_MOUSEBUTTONUP:
{
OnMouseButtonUp(event->button.button, event->button.x,event->button.y);
break;
}
case SDL_QUIT: {
OnExit();
break;
}
case SDL_SYSWMEVENT: {
//Ignore
break;
}
case SDL_WINDOWEVENT_RESIZED: {
OnResize();
break;
}
case SDL_WINDOWEVENT_EXPOSED: {
OnExpose();
break;
}
default: {
OnUser(event->user.type,event->user.code,event->user.data1,event->user.data2);
break;
}
}
}
void GUI::Play()
{
Uint32 start_ticks = SDL_GetTicks();
TakeInput(this->setup->GetEvent());
this->keyboard->ProcessKeys(this->setup->GetEvent());
this->setup->RenderBegin();
this->ship->drawBackBuffer();
this->ship->renderSprite();
Uint32 end_ticks = SDL_GetTicks();
int sleep_delay = (1000 / 60) - (end_ticks-start_ticks);
if (sleep_delay > 0) {
SDL_Delay(sleep_delay);
}
}
If you are only writing event->key.keysym.sym on the console, you should know that the spacebar key produces an almost invisible character.
Try this instead:
std::cout << "<" << event->key.keysym.sym << ">"
So you can see whataver invisible character printed between angle brackets.
I have programmed a code for displaying a GUI menu in Turbo C++ but I don't know why it wont recognize initgraph
This is the output message
BGI Error:Graphics not initialized
when i tried a simpler program on graphics in Turbo C++ it said egavga.bgi not found but it was there in the bgi file in my turbo c++ folder
Also when i tried to put the location of the bgi in initgraph it doesnt do anything
this is the program code
#include<iostream.h>
#include<conio.h>
#include <dos.h>
#include<graphics.h>
//Menu Global Item
#define pixTOrc(x) (8*(x-1)) //convert pixel into row and col format
#define INC 5 //Increment Distance Between Menu Items
#define ROW 15 //Row Value for Menu Item
#define COL 8 //Column Value for Menu Item
#define MAXMENU 5 //Total menu items
// To display the Inventory Main menu options
typedef char option[20];
option MMenu[]= {
"View Account",
"Transactions",
"New Accont",
"Edit Account",
"Quit"
};
// Function to displays all the menu prompt messages from the pointer array of option a[]
void normalvideo(int x,int y,char *str)
{
x=pixTOrc(x);
y=pixTOrc(y);
outtextxy(x,y,str);
}
// Function to move the cursor on the menu prompt with a reverse video color
void selectedMenu(int x,int y,char *str)
{
x=pixTOrc(x);
y=pixTOrc(y);
setcolor(5); //Selected Item Color
sound(400);
delay(100);
nosound();
outtextxy(x,y,str);
setcolor(WHITE); //Unselected Item Color
sound(500);
delay(100);
nosound();
}
//Keep Track of which arrow key is pressed
char menu()
{
settextstyle(TRIPLEX_FONT,HORIZ_DIR,2);
setcolor(WHITE); //Initial Menu Item Color
int i,done;
for(i = 1; i < MAXMENU; i++)
normalvideo(COL, (i*INC)+ROW, MMenu[i]);
selectedMenu(COL,ROW, MMenu[0]);
i = done = 0;
do
{
/**Status Bar Code**/
setfillstyle(SOLID_FILL,BLUE);
settextstyle(SMALL_FONT,HORIZ_DIR,5);
bar(pixTOrc(2),pixTOrc(52.5),pixTOrc(75),pixTOrc(55));
setcolor(LIGHTCYAN);
switch(i)
{
case 0 : outtextxy(pixTOrc(5),pixTOrc(52.75),"View Account --> View Detail of an account");
break;
case 1 : outtextxy(pixTOrc(5),pixTOrc(52.75),"Transactions --> Do transaction Debit/Credit");
break;
case 2 : outtextxy(pixTOrc(5),pixTOrc(52.75),"New Accont --> Create a new account for customer");
break;
case 3 : outtextxy(pixTOrc(5),pixTOrc(52.75),"Edit Account --> Edit an existing account");
break;
case 4 : outtextxy(pixTOrc(5),pixTOrc(52.75),"Close the Program");
break;
}
/**status Bar ends**/
setcolor(WHITE);
settextstyle(TRIPLEX_FONT,HORIZ_DIR,2);
int key = getch();
switch (key)
{
case 00: key = getch();
switch (key)
{
case 72: normalvideo(COL, (i*INC)+ROW, MMenu[i]);
i--;
if (i == -1)
i = MAXMENU-1;
selectedMenu(COL,(i*INC)+ROW,MMenu[i]);
break;
case 80: normalvideo(COL, (i*INC)+ROW, MMenu[i]);
i++;
if (i == MAXMENU)
i = 0;
selectedMenu(COL, (i*INC)+ROW, MMenu[i]);
break;
}
break;
case 13: done = 1;
}
}
while (!done);
return(i+49);
}
//This part you can use for main functionality of the menu
void mainArea()
{
setcolor(BLUE);
outtextxy(pixTOrc(30),pixTOrc(20),"http://cbsecsnip.in/");
setcolor(YELLOW);
}
/* Code for displaying the main menu*/
void call_menu()
{
char choice;
do
{
choice = menu();
switch (choice)
{
case '1': setcolor(BLUE);
outtextxy(pixTOrc(40),pixTOrc(15),"View Account");
mainArea();
getch();
setfillstyle(SOLID_FILL,LIGHTGRAY);
bar(pixTOrc(28),pixTOrc(14),pixTOrc(75),pixTOrc(50));
mainArea();
break;
case '2':
setcolor(BLUE);
outtextxy(pixTOrc(40),pixTOrc(15),"Transactions");
mainArea();
getch();
setfillstyle(SOLID_FILL,LIGHTGRAY);
bar(pixTOrc(28),pixTOrc(14),pixTOrc(75),pixTOrc(50));
mainArea();
break;
case '3':
setcolor(BLUE);
outtextxy(pixTOrc(40),pixTOrc(15),"New Accont");
mainArea();
getch();
setfillstyle(SOLID_FILL,LIGHTGRAY);
bar(pixTOrc(28),pixTOrc(14),pixTOrc(75),pixTOrc(50));
mainArea();
break;
case '4':
setcolor(BLUE);
outtextxy(pixTOrc(40),pixTOrc(15),"Edit Account");
mainArea();
getch();
setfillstyle(SOLID_FILL,LIGHTGRAY);
bar(pixTOrc(28),pixTOrc(14),pixTOrc(75),pixTOrc(50));
mainArea();
break;
case '5': //Close the project
setcolor(BLUE);
outtextxy(pixTOrc(40),pixTOrc(15),"Quit");
mainArea();
delay(1000);
setfillstyle(SOLID_FILL,LIGHTGRAY);
bar(pixTOrc(28),pixTOrc(14),pixTOrc(75),pixTOrc(50));
mainArea();
goto exit;
}
} while (choice != MAXMENU);
exit:
}
void main()
{
int i,j;
int gd=DETECT,gm;
initgraph(&gd,&gm,"");
setcolor(BLACK);
rectangle(0,0,640,480);
setfillstyle(SOLID_FILL,LIGHTGRAY);
bar(2,1,637,478);
setfillstyle(SOLID_FILL,BLACK);
bar(1,3,637,50);
settextstyle(BOLD_FONT,HORIZ_DIR,2);
setcolor(YELLOW);
outtextxy(pixTOrc(12),pixTOrc(1)," BANKING SYSTEM PROJECT ");
setfillstyle(CLOSE_DOT_FILL,DARKGRAY);
bar(pixTOrc(7),pixTOrc(14),pixTOrc(25),pixTOrc(50));
call_menu();
closegraph();
getch();
}
Possible Solutions:
Copy all Files from BGI folder to BIN.
Check if it works.