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| HANDLE hFile;
HANDLE hAppend;
DWORD dwBytesRead, dwBytesWritten, dwPos;
char buff[4096];
// Open the existing file.
hFile = CreateFile("ONE.TXT", // open ONE.TXT
GENERIC_READ, // open for reading
0, // do not share
NULL, // no security
OPEN_EXISTING, // existing file only
FILE_ATTRIBUTE_NORMAL, // normal file
NULL); // no attr. template
if (hFile == INVALID_HANDLE_VALUE)
{
ErrorHandler("Could not open ONE."); // process error
}
// Open the existing file, or if the file does not exist,
// create a new file.
hAppend = CreateFile("TWO.TXT", // open TWO.TXT
GENERIC_WRITE, // open for writing
0, // do not share
NULL, // no security
OPEN_ALWAYS, // open or create
FILE_ATTRIBUTE_NORMAL, // normal file
NULL); // no attr. template
if (hAppend == INVALID_HANDLE_VALUE)
{
ErrorHandler("Could not open TWO."); // process error
}
// Append the first file to the end of the second file.
// Lock the second file to prevent another process from
// accessing it while writing to it. Unlock the
// file when writing is finished.
do
{
if (ReadFile(hFile, buff, 4096, &dwBytesRead, NULL))
{
dwPos = SetFilePointer(hAppend, 0, NULL, FILE_END);
LockFile(hAppend, dwPos, 0, dwPos + dwBytesRead, 0);
WriteFile(hAppend, buff, dwBytesRead,
&dwBytesWritten, NULL);
UnlockFile(hAppend, dwPos, 0, dwPos + dwBytesRead, 0);
}
} while (dwBytesRead == 4096);
// Close both files.
CloseHandle(hFile);
CloseHandle(hAppend); |
