c++ - stuck with api getdrivetype -

i kinda stuck api getdrivetype(). every time api returns me drive_no_root_dir, passing drive letters "c:\" etc. primary drive "c:\" api returns same thing.

i have called getlogicaldrives() before retrieve.

os: winxp sp3, ntfs file system

code: compiler vs2005

int main() {      bool folder;      string * filename;      char individualdrive[4],alldrives[100];      memset(alldrives,0,100);       getlogicaldrivestringsa(100,alldrives);       for(int i=0;(i<100)&&(alldrives[i]);i+=4) {          memset(individualdrive,0,4);          strncpy(individualdrive,alldrives+i,4); //extracting individual drive strings.         if(drive_fixed == getdrivetypew((lpcwstr)individualdrive))              getfile((system::string*)individualdrive, filename,folder); }    return 0; } 

without code have guess. guesses are:

• you failed escape \ "c:\\".
• you passing ansi string unicode version of api, or vice versa.

it's hard see how api fail unless coding error of nature.

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having added code question clear second of these bullet points explanation. passing ansi string data unicode api , this, of course, fails.

to fix best switching code use unicode strings.

in addition unicode/ansi issues, think buffer handling code suspect. don't know why assuming 4 characters drive. think possible getlogicaldrivestrings return un-mapped drives.