i have some question about api MOUSE event.

[Jung Seng Won]

this is part of my code. and i am making some drawing line. first, i put my left_mousebutton then point is displayed, but the line don't draw~ it is good if i delete "WM_LBUTTONUP". can you tell me why this happen? HDC hdc; PAINTSTRUCT ps; static TCHAR str[200] ; int len; static int x = 100; static int y = 100; static bool b_start = false; case WM_LBUTTONDOWN: x = LOWORD(lParam); y = HIWORD(lParam); b_start = true; return 0; case WM_MOUSEMOVE: if(b_start == true) { hdc = GetDC(hWnd); MoveToEx(hdc, x, y, NULL); x = LOWORD(lParam); y = HIWORD(lParam); LineTo(hdc, x, y); ReleaseDC(hWnd, hdc); }//b_start == true case WM_LBUTTONUP: b_start = false; return 0; }//iMessage return (DefWindowProc(hWnd, iMessage, wParam, lParam)); }//LRESULT

Thank you everyone~

[followait]

just debug

[Vince Rojas]

Perhaps you forgot to put a 'return 0': case WM_MOUSEMOVE: if(b_start == true) { hdc = GetDC(hWnd); MoveToEx(hdc, x, y, NULL); x = LOWORD(lParam); y = HIWORD(lParam); LineTo(hdc, x, y); ReleaseDC(hWnd, hdc); }//b_start == true // <----------------------------------- H E R E case WM_LBUTTONUP: b_start = false; return 0; Only fools rush in. Foo!

[Jung Seng Won]

it is working when i put return 0, ~ thank you~~

Thank you everyone~