看看这个如何：
你应该自己多考虑一下，动动脑子呀。

#pragma code ("kernel32.dll")
VOID GetLocalTime(LPSYSTEMTIME lpSystemTime);
BOOL CreateDirectoryA(LPCTSTR lpFileName,LPSECURITY_ATTRIBUTES lpSecurityAttributes);
#pragma code ()

char szDir[255]="D:\\生产报表\\";//建立的文件夹的路径
char szDir2[255]="";
char szDir3[255]="";
char szDir4[255]="";
HWND hwnd=NULL;
int iRet;

BOOL fbRet=FALSE;
BOOL fbRet2=FALSE;
BOOL fbRet3=FALSE;
BOOL fbRet4=FALSE;

SYSTEMTIME sysTime;
GetLocalTime(&sysTime);
sprintf(szDir2,"D:\\生产报表\\%d年\\",sysTime.wYear);
sprintf(szDir3,"D:\\生产报表\\%d年\\%d月\\",sysTime.wYear,sysTime.wMonth);
sprintf(szDir4,"D:\\生产报表\\%d年\\%d月\\%d日\\",sysTime.wYear,sysTime.wMonth,sysTime.wDay);
hwnd=FindWindow(NULL,"WinCC-运行系统 - ");

fbRet=CreateDirectoryA(szDir,NULL);
if (!fbRet)
{
iRet=MessageBox(hwnd,"生产报表文件夹已经创建了！","对话框",MB_OKMB_ICONQUESTIONMB_SYSTEMMODAL);
}
else
{
iRet=MessageBox(hwnd,"生产报表文件夹创建成功！","对话框",MB_OKMB_ICONQUESTIONMB_SYSTEMMODAL);
}

fbRet2=CreateDirectoryA(szDir2,NULL);
if (!fbRet2)
{
iRet=MessageBox(hwnd,"年报表文件夹已经存在！","对话框",MB_OKMB_ICONQUESTIONMB_SYSTEMMODAL);
}
else
{
iRet=MessageBox(hwnd,"年报表文件夹创建成功！","对话框",MB_OKMB_ICONQUESTIONMB_SYSTEMMODAL);
}

fbRet3=CreateDirectoryA(szDir3,NULL);
if (!fbRet3)
{
iRet=MessageBox(hwnd,"月报表文件夹已经存在！","对话框",MB_OKMB_ICONQUESTIONMB_SYSTEMMODAL);
}
else
{
iRet=MessageBox(hwnd,"月报表文件夹创建成功！","对话框",MB_OKMB_ICONQUESTIONMB_SYSTEMMODAL);
}

fbRet4=CreateDirectoryA(szDir4,NULL);
if (!fbRet4)
{
iRet=MessageBox(hwnd,"日报表文件夹已经存在！","对话框",MB_OKMB_ICONQUESTIONMB_SYSTEMMODAL);
}
else
{
iRet=MessageBox(hwnd,"日报表文件夹创建成功！","对话框",MB_OKMB_ICONQUESTIONMB_SYSTEMMODAL);
}