我写了以下代码:
#include <windows.h>
#include "stdbool.h"
#include <winuser.h>
#include <WinDef.h>
#include <Winerror.h>
#include <stdio.h>
#include <Strsafe.h>
#define MAX_SIZE 100
void DisplayError(LPTSTR lpszFunction)
// Routine Description:
// Retrieve and output the system error message for the last-error code
{
LPVOID lpMsgBuf;
LPVOID lpDisplayBuf;
DWORD dw = GetLastError();
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dw,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0,
NULL );
lpDisplayBuf =
(LPVOID)LocalAlloc( LMEM_ZEROINIT,
( lstrlen((LPCTSTR)lpMsgBuf)
+ lstrlen((LPCTSTR)lpszFunction)
+ 40) // account for format string
* sizeof(TCHAR) );
if (FAILED( StringCchPrintf((LPTSTR)lpDisplayBuf,
LocalSize(lpDisplayBuf) / sizeof(TCHAR),
TEXT("%s failed with error code %d as follows:\n%s"),
lpszFunction,
dw,
lpMsgBuf)))
{
printf("FATAL ERROR: Unable to output error code.\n");
}
printf(TEXT("ERROR: %s\n"), (LPCTSTR)lpDisplayBuf);
LocalFree(lpMsgBuf);
LocalFree(lpDisplayBuf);
}
int main(){
//parameters of CreateFile()
HANDLE hFile;
LPCTSTR lpFileName;
DWORD dwDesiredAccess;
DWORD dwShareMode;
LPSECURITY_ATTRIBUTES lpSecurityAttributes;
DWORD dwCreationDisposition;
DWORD dwFlagsAndAttributes;
HANDLE hTemplateFile;
//parameters of WriteFile()
DWORD nNumberOfBytesToWrite;
DWORD numberOfBytesWritten;
LPOVERLAPPED lpOverlapped;
char DataBuffer[MAX_SIZE];
//others
BOOL bErrorFlag;
//initialize args of CreateFile()
lpFileName = "C:\\file.txt";
dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;
dwShareMode = 0;
lpSecurityAttributes = NULL;
dwCreationDisposition = CREATE_NEW;
dwFlagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
hTemplateFile = NULL;
//initialize args of WriteFile()
strcpy(DataBuffer, "This is the test file");
nNumberOfBytesToWrite = (DWORD)strlen(DataBuffer);
numberOfBytesWritten = 0;
lpOverlapped = NULL;
hFile = CreateFile(lpFileName, dwDesiredAccess, dwShareMode,
lpSecurityAttributes, dwCreationDisposition,
dwFlagsAndAttributes, hTemplateFile);
if (hFile == INVALID_HANDLE_VALUE)
{
DisplayError(TEXT("CreateFile"));
printf(TEXT("Terminal failure: Unable to open file \"%s\" for write.\n"), lpFileName);
return;
}
printf(TEXT("Writing %d bytes to %s.\n"), nNumberOfBytesToWrite, lpFileName);
bErrorFlag = WriteFile(hFile, DataBuffer, nNumberOfBytesToWrite,
&numberOfBytesWritten, lpOverlapped);
if (FALSE == bErrorFlag)
{
DisplayError(TEXT("WriteFile"));
printf("Terminal failure: Unable to write to file.\n");
}
else
{
if (numberOfBytesWritten != nNumberOfBytesToWrite)
{
// This is an error because a synchronous write that results in
// success (WriteFile returns TRUE) should write all data as
// requested. This would not necessarily be the case for
// asynchronous writes.
printf("Error: dwBytesWritten != dwBytesToWrite\n");
}
else
{
printf(TEXT("Wrote %d bytes to %s successfully.\n"), numberOfBytesWritten, lpFileName);
}
}
CloseHandle(hFile);
}
所以,如你所见。应该在桌面上创建一个名为 file.txt 的文件并在其中写入一些文本的程序。我使用 Microsoft Visual C++ Express,它编译时没有错误。但是当我通过单击绿色播放按钮运行它时,我看不到在我的桌面上创建了这样的文件。
通过搜索我可能的错误,我还在https://msdn.microsoft.com/en-us/library/windows/desktop/bb540534%28v=vs.85%29.aspx上阅读了他们使用几乎相同的代码。除了我不包括显示错误部分。
所以,我的问题是:它不起作用的原因可能是什么?我(程序)是否需要一些额外的权限才能做到这一点?例如,我在 Ubuntu 中使用 open() 和 write() 编写了相同的内容,只是我使用“/tmp/file.txt”作为目标目录。它无需额外权限即可工作。
此致,