copyfile.c

C#一个实例源代码

#include <windows.h>
#include <stdio.h>
int main()
{
HANDLE hFile; 
 
HANDLE hTempFile; 
 
DWORD  dwBytesRead, dwBytesWritten, dwPos; 
 
char szTempName[MAX_PATH]; 
 
char buffer[4096]; 
 
// Open the existing file. 
 
hFile = CreateFile("ORIGINAL.TXT",  // file name 
    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) 
{ 
    printf("%c","Could not open file."); // process error 
} 
 
// Create a temporary file. 
 
GetTempFileName("\\TEMP", // dir. 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,                         // no security 
    CREATE_ALWAYS,                // overwrite existing file
    FILE_ATTRIBUTE_NORMAL,        // normal file 
    NULL);                        // no attr. template 

if (hTempFile == INVALID_HANDLE_VALUE) 
{ 
    printf("%c","Could not open file."); // process error 
} 
 
// Read 4K blocks to the buffer. 
// Change all characters in the buffer to uppercase. 
// 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 == 4096); 
 
// Close both files. 
 
CloseHandle(hFile); 
CloseHandle(hTempFile); 
 
// Move the temporary file to the new text file.
 
if (!MoveFile(szTempName, "ALLCAPS.TXT")) 
{ 
    printf("%c","Could not open file."); // process error 
} 


return 0;
}