under Windows 7 the .bat call manage-bde problem while using exe to run .bat

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VisualC++

to unlock the drive g:, for convenience, using a bat file unlock.bat
The bat file content is: manage-bde -unlock g: -rp 326000-202006-900200-039038-535898-009303-683253-581356
This line work manually, after double-click the .bat file under windows 7, the drive g: will be unlocked normally.

for more convenient, attempting to run it automatically through calling the EXE file, using CreateProcess to realize, as follows:

/////////////C/C++ code

SECURITY_ATTRIBUTES sa;  
HANDLE hRead,hWrite;  

sa.nLength = sizeof(SECURITY_ATTRIBUTES);  
sa.lpSecurityDescriptor = NULL;  
sa.bInheritHandle = TRUE;  
if (!CreatePipe(&hRead,&hWrite,&sa,0))   
{  
return FALSE;  
}   

STARTUPINFO si;  
PROCESS_INFORMATION pi;   
si.cb = sizeof(STARTUPINFO);  
GetStartupInfo(&si);   
si.hStdError = hWrite;  
si.hStdOutput = hWrite;  
si.wShowWindow = SW_SHOW;  
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;  

if(!CreateProcess(NULL, EXECDOSCMD ,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))   
{
AfxMessageBox("false");
return FALSE;
}  
CloseHandle(hWrite);  

char buffer[4096] = {0};  
DWORD bytesRead;   
while (true)   
{  
if (ReadFile(hRead,buffer,4095,&bytesRead,NULL) == NULL)  
break;  
AfxMessageBox(buffer);  
Sleep(200);   
}
return TRUE; 

The results are

****************************************

C:\>manage-bde.exe -unlock g: -rp

326000-202006-900200-039038-535898-009303-683253-581356

'manage-bde.exe'is not recognized as an internal or external command, operable pregram

Or batch file.

****************************************

If the contents of the bat file to Ping www.139.com

Result

****************************************

Being Ping 163.xdwscache.glb0.lxdns.com [121.14.228.43] has 32 bytes of data:

From 121.14.228.43: =32 =11ms TTL=55 byte time

From 121.14.228.43: =32 =11ms TTL=55 byte time

From 121.14.228.43: =32 =10ms TTL=55 byte time

From 121.14.228.43: =32 =11ms TTL=55 byte time

121.14.228.43 Ping statistics:

Packet: sent = 4, received = 4, loss = 0 (0% lost),

The estimation of round trip time (in milliseconds):

The shortest = 10ms, the longest average = = 11ms, 10ms

****************************************

One might argue that when system boot, it can directly run .bat file, because I want to save the password in a different place, not in .bat file, so I want to use the EXE to solve. There may also be one will say, directly calls the manage-bde.exe will also unlock the drive, but I have tried for a long time, later abandoned. directly calling the .bat file, is a relatively simple approach I think.

Maybe the problem is not a simple VC problem!!

who knows how to use manage-bde that can practise my trying, Thank you.