Windows API GetShortPathName GetLongPathName

函数原型:

The GetShortPathName function retrieves the short path form of a
specified input path.

DWORD GetShortPathName(
                                                LPCTSTR lpszLongPath,  // null-terminated path string
                                                LPTSTR lpszShortPath,  // short form buffer
                                                DWORD cchBuffer        // size of short form buffer，in TCHARs
                                               );

The GetLongPathName function converts the specified path to its long
form. If no long path is found, this function simply returns the specified name.
DWORD GetLongPathName(
                                                LPCTSTR lpszShortPath, // file name
                                                LPTSTR lpszLongPath,   // path buffer
                                                DWORD cchBuffer        // size of path buffer，in TCHARs
                                              );

说明:
这两个函数是用来把传入的路径转换为相对应的长路径或者短路径的，传入的路径要必须存在，否则会转换失败。
写一个程序事例:

int _tmain(int argc, _TCHAR* argv[])
{
	WCHAR szShort[MAX_PATH] = { 0 };
	WCHAR szFullPath[MAX_PATH] = TEXT("D:\\桌面\\MP3\\英语\\hommesick.mp3");
	DWORD dwShortBytes = GetShortPathName(szFullPath, szShort, MAX_PATH);

	WCHAR wszLongPath[MAX_PATH] = { 0 };
	DWORD dwLongBytes = GetLongPathName(szShort, wszLongPath, MAX_PATH);

	WCHAR szPath[MAX_PATH] = { 0 };
	GetModuleFileName(NULL, szPath, MAX_PATH);

	WCHAR wszLong[MAX_PATH] = { 0 };
	DWORD dwLong = GetLongPathName(szPath, wszLong, MAX_PATH);

}

结果:

分析:
可见szShort被转化为短格式的路径，还可以得出并不是所有的路径都可以被转化的，传入的路径本身已经为长路径或者短路径 ，而调用GetLongPathName或者GetShortPathName的话，则不会转换