hdc = GetDC(hwnd);
HPEN green_pen = CreatePen(PS_SOLID, 1, RGB(0,255,0)); HPEN old_pen = SelectObject (hdc, green_pen); MoveToEx(hdc, 10, 10, NULL);
LineTo(hdc,100, 100); SelectObject(hdc, old_pen);
DeleteObject(green_pen); ReleaseDC(hwnd,hdc);
我想用绿色画一条从(10,10)到坐标(100,100)的线,但是编译的时候报错~~error C2440: 'initializing' : cannot convert from 'void *' to 'struct HPEN__ *' Conversion from 'void*' to pointer to non-'void' requires an explicit cast
HPEN green_pen = CreatePen(PS_SOLID, 1, RGB(0,255,0)); HPEN old_pen = SelectObject (hdc, green_pen); MoveToEx(hdc, 10, 10, NULL);
LineTo(hdc,100, 100); SelectObject(hdc, old_pen);
DeleteObject(green_pen); ReleaseDC(hwnd,hdc);
我想用绿色画一条从(10,10)到坐标(100,100)的线,但是编译的时候报错~~error C2440: 'initializing' : cannot convert from 'void *' to 'struct HPEN__ *' Conversion from 'void*' to pointer to non-'void' requires an explicit cast
HPEN green_pen = ::CreatePen(PS_SOLID, 1, RGB(0,255,0)); HPEN old_pen = ::SelectObject (hdc, green_pen);
::MoveToEx(hdc, 10, 10, NULL);
::LineTo(hdc,100, 100); ::SelectObject(hdc, old_pen);
::DeleteObject(green_pen); ::ReleaseDC(hwnd,hdc);
HPEN green_pen = CreatePen(PS_SOLID, 1, RGB(0,255,0)); HPEN old_pen = SelectObject (hdc, green_pen);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~错了,返回值是HGDIOBJECT 强制类型转换 (HPEN)SelectObject(hdc,green_pen) MoveToEx(hdc, 10, 10, NULL);
LineTo(hdc,100, 100); SelectObject(hdc, old_pen);
DeleteObject(green_pen); ReleaseDC(hwnd,hdc);
我想用绿色画一条从(10,10)到坐标(100,100)的线,但是编译的时候报错~~error C2440: 'initializing' : cannot convert from 'void *' to 'struct HPEN__ *' Conversion from 'void*' to pointer to non-'void' requires an explicit cast
上面打错了,不好意思