然后用WriteFile和ReadFile来操作，最后需要CloseHandle.
#include <windows.h>
#include <stdio.h>
#define BUFSIZE 4096
int main()
{
HANDLE hFile
HANDLE hTempFile
DWORD dwBytesRead, dwBytesWritten, dwBufSize=BUFSIZE
char szTempName[MAX_PATH]
char buffer[BUFSIZE]
char lpPathBuffer[BUFSIZE]
// Open the existing file.
hFile = CreateFile("original.txt", // file name
GENERIC_READ, // open for reading
0, // do not share
NULL, // default security
OPEN_EXISTING, // existing file only
FILE_ATTRIBUTE_NORMAL, // normal file
NULL) // no template
if (hFile == INVALID_HANDLE_VALUE)
{
printf("Could not open file.")
return 0
}
// Get the temp path
GetTempPath(dwBufSize, // length of the buffer
lpPathBuffer) // buffer for path
// Create a temporary file.
GetTempFileName(lpPathBuffer, // directory for temp files
"NEW",// temp file name prefix
0,// create unique name
szTempName) // buffer for name
hTempFile = CreateFile((LPTSTR) szTempName, // file name
GENERIC_READ | GENERIC_WRITE, // open for read/write
0,// do not share
NULL, // default security
CREATE_ALWAYS,// overwrite existing file
FILE_ATTRIBUTE_NORMAL,// normal file
NULL) // no template
if (hTempFile == INVALID_HANDLE_VALUE)
{
printf("Could not create temporary file.")
return 0
}
// Read 4K blocks to the buffer.
// Change all characters in the buffer to upper case.
// Write the buffer to the temporary file.
do
{
if (ReadFile(hFile, buffer, 4096,
&dwBytesRead, NULL))
{
CharUpperBuff(buffer, dwBytesRead)
WriteFile(hTempFile, buffer, dwBytesRead,
&dwBytesWritten, NULL)
}
} while (dwBytesRead == BUFSIZE)
// Close both files.
CloseHandle(hFile)
CloseHandle(hTempFile)
// Move the temporary file to the new text file.
if (!MoveFileEx(szTempName,
"allcaps.txt",
MOVEFILE_REPLACE_EXISTING))
{
printf("Could not move temp file.")
return 0
}
}
