C++ 常用代碼片段整理
一丶文件 文件夾相關
1.1 遞歸刪除文件
wstring Utilstring2wstring(string str)
{
wstring result;
//獲取緩衝區大小,並申請空間,緩衝區大小按字符計算
int len = MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.size(), NULL, 0);
wchar_t* buffer = NULL;
buffer = new wchar_t[len + 1];
//多字節編碼轉換成寬字節編碼
MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.size(), buffer, len);
buffer[len] = L'\0'; //添加字符串結尾
//刪除緩衝區並返回值
result.append(buffer);
if (buffer != NULL)
{
delete[] buffer;
buffer = NULL;
}
return result;
}
//將wstring轉換成string
string Utilwstring2string(wstring wstr)
{
string result;
//獲取緩衝區大小,並申請空間,緩衝區大小事按字節計算的
int len = WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), NULL, 0, NULL, NULL);
char* buffer = new char[len + 1];
//寬字節編碼轉換成多字節編碼
WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), buffer, len, NULL, NULL);
buffer[len] = '\0';
//刪除緩衝區並返回值
result.append(buffer);
delete[] buffer;
return result;
}
bool DeleteAllFileA(std::string FileName)
{
string RootFileName = FileName;
wstring wRootFileName = Utilstring2wstring(RootFileName);
RootFileName = endsWith(wRootFileName, L"\\") ? RootFileName : RootFileName + "\\";
string RmFilter = RootFileName + "*.*";
WIN32_FIND_DATAA windata = { 0 };
HANDLE hFileHandle = FindFirstFileA(RmFilter.c_str(), &windata);
do
{
if (windata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
string compareDirName = windata.cFileName;
if (compareDirName.find(".") != compareDirName.npos
|| compareDirName.find("..") != compareDirName.npos)
{
continue;
}
//遞歸刪除
string RmFileName = RootFileName + compareDirName;
DeleteAllFileA(RmFileName);
RemoveDirectoryA(RmFileName.c_str()); //遞歸刪除文件夾
continue;
}
//直接刪除文件
string RmFileName = RootFileName + windata.cFileName;
DeleteFileA(RmFileName.c_str());
} while (FindNextFileA(hFileHandle, &windata));
return true;
}