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The FindWindow function retrieves the handle of the top-level window whose class name and window name match the specified strings. This function does not search child windows.

HWND FindWindow(
LPCTSTR lpClassName, // address of class name
LPCTSTR lpWindowName // address of window name


lpClassName : Points to a null-terminated string that specifies the class name or is an atom that identifies the class-name string. If this parameter is an atom, it must be a global atom created by a previous call to the GlobalAddAtom function. The atom, a 16-bit value, must be placed in the low-order word of lpClassName; the high-order word must be zero.

lpWindowName : Points to a null-terminated string that specifies the window name (the window's title). If this parameter is NULL, all window names match.

Return Value

If the function succeeds, the return value is the handle of the window that has the specified class name and window name.
If the function fails, the return value is NULL. To get extended error information, call GetLastError.