Read/Write Example (Windows CE 5.0)
The following code example shows how to append one file to the end of another file. In the example, =CreateFile opens two text (.txt) files: One.txt for reading and Two.txt for writing. Then, the ReadFile and WriteFile functions append the contents of One.txt to the end of Two.txt by reading and writing 4-KB blocks.
void AppendExample (void)
{
HANDLE hFile, hAppend;
DWORD dwBytesRead, dwBytesWritten, dwPos;
char buff[4096];
TCHAR szMsg[1000];
// Open the existing file.
hFile = CreateFile (TEXT("\\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 template file
if (hFile == INVALID_HANDLE_VALUE)
{
// Your error-handling code goes here.
wsprintf (szMsg, TEXT("Could not open ONE.TXT"));
return;
}
// Open the existing file, or, if the file does not exist,
// create a new file.
hAppend = CreateFile (TEXT("\\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 template file
if (hAppend == INVALID_HANDLE_VALUE)
{
wsprintf (szMsg, TEXT("Could not open TWO.TXT"));
CloseHandle (hFile); // Close the first file.
return;
}
// Append the first file to the end of the second file.
dwPos = SetFilePointer (hAppend, 0, NULL, FILE_END);
do
{
if (ReadFile (hFile, buff, 4096, &dwBytesRead, NULL))
{
WriteFile (hAppend, buff, dwBytesRead,
&dwBytesWritten, NULL);
}
}
while (dwBytesRead == 4096);
// Close both files.
CloseHandle (hFile);
CloseHandle (hAppend);
return;
} // End of AppendExample code
See Also
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