How to backup using backup API's in c++

Hi,

I am writing an application that used to backup some specified file, therefore using the backup API calls i.e CreateFile BackupRead and WriteFile.

getting Access violation reading location.

I have attached code below.
[code]#include

int main()
{
HANDLE hInput, hOutput;

//m_filename is a variable holding the file path to read from
hInput = CreateFile(L"C:\Key.txt", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);

//strLocation contains the path of the file I want to create.
hOutput= CreateFile(L"C:\tmp\", GENERIC_WRITE, NULL, NULL, CREATE_ALWAYS, NULL, NULL);


DWORD dwBytesToRead = 1024 * 1024 * 10;
BYTE *buffer;
buffer = new BYTE[dwBytesToRead];
BOOL bReadSuccess = false,bWriteSuccess = false;
DWORD dwBytesRead,dwBytesWritten;
LPVOID lpContext;
//Now comes the important bit:

do
{
bReadSuccess = BackupRead(hInput, buffer, sizeof(BYTE) *dwBytesToRead, &dwBytesRead, false, true, &lpContext);

bWriteSuccess= WriteFile(hOutput, buffer, sizeof(BYTE) *dwBytesRead, &dwBytesWritten, NULL);

}while(dwBytesRead == dwBytesToRead);

return 0;
}
[/code]

Any one suggest me how to use these API's?

Thanks.
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