2009年7月8日 #
osql.exe -S %TARGETSERVER% -E -d Northwind -Q"select db_id()" > nul
if %errorlevel% == 0 (
@echo.
@echo Northwind DB already exists.
@echo.
goto end
)
@echo.
@echo Creating Northwind DB ...
@echo.
osql.exe -S !TARGETSERVER! -E -n -i !WORKINGDIR!\instnwnd90.sql
:end
'CString' to 'std::string':
std::string cannot always construct from a LPCTSTR i.e. the code will fail for UNICODE builds.
So the following conversion will lead to error:
CString cs("Hello");
std::string s((LPCTSTR)cs);
As std::string can construct only from LPSTR / LPCSTR, a programmer who uses VC++ 7.x or better can utilize conversion classes such as CT2CA as an intermediary.
CString cs ("Hello");
// Convert a TCHAR string to a LPCSTR
CT2CA pszConvertedAnsiString (cs);
// construct a std::string using the LPCSTR input
std::string strStd (pszConvertedAnsiString);
'std::string' to 'CString':
std::string s("Hello");
CString cs(s.c_str());
DWORD WINAPI FolderFilesWatchDogThread(LPVOID lpParam) // thread procedure
{
HANDLE hFileChange =
::FindFirstChangeNotification((LPCTSTR)lpParam, // folder path
FALSE, // don't look in subfolders
FILE_NOTIFY_CHANGE_FILE_NAME);
// watch for
// renaming, creating,
// or deleting a file
if(INVALID_HANDLE_VALUE == hFileChange)
{
DWORD dwError = ::GetLastError();
// handle error (see this FAQ)
return dwError;
}
while(TRUE)
{
::WaitForSingleObject(hFileChange, INFINITE);
// Bark, bark!!! A file was renamed, created or deleted.
::FindNextChangeNotification(hFileChange);
}
return 0;
}
// somewhere in the space...
::CreateThread(NULL, 0, FolderFilesWatchDogThread, _T("c:\\temp"), 0, NULL);DWORD WINAPI FolderWatchThread(LPVOID lpParam) // thread procedure
{
HANDLE hDirectory =
::CreateFile((LPCTSTR)lpParam, // folder path
FILE_LIST_DIRECTORY,
FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
if(INVALID_HANDLE_VALUE == hDirectory)
{
DWORD dwError = ::GetLastError();
// handle error (see this FAQ)
return dwError;
}
DWORD dwBytesReturned = 0;
const DWORD dwBuffLength = 4096;
BYTE buffer[dwBuffLength];
WCHAR wchFileName[_MAX_PATH + 1];
while(::ReadDirectoryChangesW(hDirectory, buffer, dwBuffLength, FALSE,
FILE_NOTIFY_CHANGE_FILE_NAME, &dwBytesReturned,
NULL, NULL))
{
DWORD dwNextEntryOffset = 0;
PFILE_NOTIFY_INFORMATION pfni = NULL;
do
{
pfni = (PFILE_NOTIFY_INFORMATION)(buffer + dwNextEntryOffset);
switch(pfni->Action)
{
case FILE_ACTION_ADDED:
// The file was added to the directory.
break;
case FILE_ACTION_REMOVED:
// The file was removed from the directory.
break;
case FILE_ACTION_RENAMED_OLD_NAME:
// The file was renamed and this is the old name.
break;
case FILE_ACTION_RENAMED_NEW_NAME:
// The file was renamed and this is the new name.
break;
// ...
}
memcpy(wchFileName, pfni->FileName, pfni->FileNameLength);
wchFileName[pfni->FileNameLength / sizeof(WCHAR)] = L'\0';
// Enjoy of added, removed, or modified file name...
dwNextEntryOffset += pfni->NextEntryOffset; // next please!
}while(pfni->NextEntryOffset != 0);
}
::CloseHandle(hDirectory);
return 0;
}1.
#ifndef HEADER_BASE_HPP
#define HEADER_BASE_HPP
class base_class
{
// some code
};
#endif // HEADER_BASE_HPP
The first line checks whether we have not yet defined 'HEADER_BASE_HPP'. If we have not, then we define it and include the rest of the file. If it is already defined, i.e. if this header file has already been included, then we will just skip until the end of the file and nothing more will get dumped into the '.cpp' file.
2.
#pragma once
// content of the header
class base_class
{
};
On Microsoft compilers guarding can be done using #pragma once, as the first pre-processor directive in a header.
| WINSHELLAPI int WINAPI SHFileOperation (LPSHFILEOPSTRUCT lpFIleOp); |
| Typedef struct _ShFILEOPSTRUCT { HWND hWnd; //消息发送的窗口句柄； UINT wFunc; //操作类型 LPCSTR pFrom; //源文件及路径 LPCSTR pTo; //目标文件及路径 FILEOP_FLAGS fFlags; //操作与确认标志 BOOL fAnyOperationsAborted; //操作选择位 LPVOID hNameMappings; //文件映射 LPCSTR lpszProgressTitle; //文件操作进度窗口标题 }SHFILEOPSTRUCT, FAR * LPSHFILEOPSTRUCT; |