GlobalFindAtom,GlobalAddAtom(20分)

谁知道GlobalFindAtom,GlobalAddAtom是做什么用的？请讲的详细一点。谢谢！

GlobalFindAtom在dephi中查找global atom table给定字符串中的元子。<br>摘自dephi6的帮助：<br>ATOM GlobalFindAtom(<br><br>&nbsp; &nbsp; LPCTSTR lpString // pointer to the string to find &nbsp;<br>&nbsp; &nbsp; <br>&nbsp;<br><br>Parameters<br><br>lpString<br><br>Points to the null-terminated character string to search for. <br><br>&nbsp;<br><br>Return Values<br><br>If the function succeeds, the return value is the global atom associated with the given string.<br>If the function fails, the return value is zero. To get extended error information, call GetLastError. <br><br>Remarks<br><br>Even though Windows preserves the case of a string in an atom table as it was originally entered, the search performed by GlobalFindAtom is not case sensitive.<br>GlobalAddAtom在dephi中是向global atom table加入字符串and returns a unique value (an atom) identifying the string. &nbsp;<br>摘自dephi6的帮助：<br>ATOM GlobalAddAtom(<br><br>&nbsp; &nbsp; LPCTSTR lpString // pointer to the string to add <br>&nbsp; &nbsp; <br>&nbsp;<br><br>Parameters<br><br>lpString<br><br>Points to the null-terminated string to be added. The string can have a maximum size of 255 bytes. Strings that differ only in case are considered identical. The case of the first string of this name added to the table is preserved and returned by the GlobalGetAtomName function. <br><br>&nbsp;<br><br>Return Values<br><br>If the function succeeds, the return value is the newly created atom.<br>If the function fails, the return value is zero. To get extended error information, call GetLastError. <br><br>Remarks<br><br>If the string already exists in the global atom table, the atom for the existing string is returned and the atom's reference count is incremented. <br>The string associated with the atom is not deleted from memory until its reference count is zero. For more information, see the <br>GlobalDeleteAtom function. <br>Global atoms are not deleted automatically when the application terminates. For every call to the GlobalAddAtom function, there must be a corresponding call to the GlobalDeleteAtom function. <br><br>GlobalAddAtom returns a string atom whose value is in the range 0xC000 through 0xFFFF. <br>If the lpString parameter has the form "#1234", GlobalAddAtom returns an integer atom whose value is the 16-bit representation of the decimal number specified in the string (0x04D2, in this example). If the decimal value specified is 0x0000 or a value in the range 0xC000 through 0xFFFF, the return value is zero, indicating an error. If lpString is in the range 0x0001 through 0xBFFF, the return value is the low-order word of lpString. <br><br>The MAKEINTATOM macro can be used to convert a WORD value into a string that can be added to the atom table by using the GlobalAddAtom function. <br><br>

上面的这位同志，谢谢你的帮助，不过我还是不懂它们到底是做什么用的，能不能用中文详细的讲一讲？<br>不胜感激！

全局原子表<br>可以在程序间交流数据吧？

楼上说得很对，可以用来交流数据，<br>另一种用途也很普遍，防止程序重复启动。

多人接受答案了。