[求助]UG二次开发问题[急][3q]

如何用VC在UG中打开文件，我下面的代码只能打开UG环境，文件没打开
  
extern "C" DllExport void ufsta( char *param, int *returnCode, int rlen )
{
    /* Initialize the API environment */
    int errorCode = UF_initialize();
  
    if ( 0 == errorCode )
    {
        /* TODO: Add your application code here */
        UF_PART_load_status_t error_status;
  
        char part_name1[133]="G:\\mouse2.prt";
   
        int unit=1;
        tag_t part1;  
  
        UF_PART_open(part_name1,[$part1,&error_status)]
  
        /* Terminate the API environment */
        errorCode = UF_terminate();
    }
  
    /* Print out any error messages */
    //PrintErrorMessage( errorCode );
}
  
VC中的环境设置如下
project->setting->debug->excecutable for debug session = ugraf.exe
  
请高人指点

为什么没人回复呀,我急急急急急急!