I'm trying to get a number from an edit box and just have it multiplyed but since GetWindowText uses a character buffer i can't multiply it and if i use something like atoi() when i go to pass it back to the SetWindowText it tells me that it can't convert char to int. So how would i get an intiger from an edit box(i'm not using a dialog) do some mathmatical equation on it and return it to the SetWindoText to display it back in the edit box again?
Here is a sample code.
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myEditBox.SetWindowText("2002");
// Now you want to multiply 2002 by 2
CString num;
myEditBox.GetWindowText(&num);
long temp = atol(&num) * 2;
num.Format("%d", temp);
myEditBox.SetWindowText(num);
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Kuphryn
I'm still getting the error Cannot convert 'int' to 'const char *' that was my original problem. I'm usinc borlands compliler 5.5 if that makes any difference.
Oh. You're using Borland. I am not sure about Borland C++.
Kuphryn
anyone else got any ideas how to make this work?
Use atoi and itoa....Code:#include <windows.h> #include <stdlib.h> LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM); char szClassName[] = "WindowsApp"; HINSTANCE g_hInst; int WINAPI WinMain(HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nFunsterStil) { HWND hwnd; MSG messages; WNDCLASSEX wincl; g_hInst = hThisInstance; wincl.hInstance = hThisInstance; wincl.lpszClassName = szClassName; wincl.lpfnWndProc = WindowProc; wincl.style = CS_DBLCLKS; wincl.cbSize = sizeof(WNDCLASSEX); wincl.hIcon = LoadIcon(NULL, IDI_APPLICATION); wincl.hIconSm = LoadIcon(NULL, IDI_APPLICATION); wincl.hCursor = LoadCursor(NULL, IDC_ARROW); wincl.lpszMenuName = NULL; wincl.cbClsExtra = 0; wincl.cbWndExtra = 0; wincl.hbrBackground = (HBRUSH) GetStockObject(LTGRAY_BRUSH); if(!RegisterClassEx(&wincl)) return 0; hwnd = CreateWindowEx(0,szClassName, "Poor Man's Calc", WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT, 200,120, HWND_DESKTOP,NULL, hThisInstance,NULL ); ShowWindow(hwnd, nFunsterStil); UpdateWindow(hwnd); while(GetMessage(&messages, NULL, 0, 0)) { TranslateMessage(&messages); DispatchMessage(&messages); } return messages.wParam; } LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { static HWND hEdit,hButton; char str[10]; int x; switch (message) { case WM_CREATE: hEdit = CreateWindow("EDIT","",WS_CHILD | WS_VISIBLE, 10,10,100,30,hwnd,NULL,g_hInst,NULL); hButton = CreateWindow("BUTTON","Multiply by 10", WS_CHILD | WS_VISIBLE,10,50,100,30,hwnd,NULL,g_hInst,NULL); break; case WM_COMMAND: if((HWND) lParam == hButton){ GetWindowText(hEdit,str,10); if(str[0] == 0) break; x = atoi(str); if(x) SetWindowText(hEdit,itoa(x*10,str,10)); else MessageBox(hwnd,"Error",NULL,NULL); } break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hwnd, message, wParam, lParam); } return 0; }
You could use GetDlgItemInt()
"There are three kinds of people in the world...
Those that can count and those that can't."
Thanks, that worked.
i have one more probles, it works fine, you enter the number and it gets multiplyed but when i certain numbers though it returns a value thats not it multiplies like i could enter 6 and it will return the letter c. any one have a fix for this, also it doesn't read a number like 1.2 it only multiplys the 1 in 1.2
And is there a style or something that only allows numbers to be enter in an edit box?
use something like sprintf()
After you get the number from the edit (use ES_NUMBER for numerical input only, or isdigit() on string)
atoi() or atof(), make sure you cast correctly
then sprintf() back to text to set into the edit.
sprintf(sBuffer,"%02.2f",fNum);
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