VC++.NET

基本

ポインタと new と null

StreamWriter^ pwriter = nullptr;
pwriter = gcnew StreamWriter("C:\\KBTest.txt");

ファイルの読み書き

ファイルを読む

listBox1->Items->Clear();
try {
    String^ textFile = String::Concat(windir,"\\mytest.txt");
    StreamReader^ reader = gcnew StreamReader(textFile);
    do
    {
        listBox1->Items->Add(reader->ReadLine());
    }
    while(reader->Peek() != -1);
}
catch(FileNotFoundException^ ex)
{
    listBox1->Items->Add(ex);
}
catch(System::Exception^ e)
{
    listBox1->Items->Add(e);
}

ファイルに書く

StreamWriter^ pwriter = gcnew StreamWriter("C:\\KBTest.txt");
pwriter->WriteLine("File created using StreamWriter class.");
pwriter->Close();
listBox1->Items->Clear();
String ^filew = gcnew String("File Written to C:\\KBTest.txt");
listBox1->Items->Add(filew);

ファイル情報の表示

listBox1->Items->Clear();
String^ testfile = String::Concat(windir,"\\notepad.exe");
FileInfo^ pFileProps = gcnew FileInfo(testfile);

listBox1->Items->Add(String::Concat("File Name = ", pFileProps->FullName));
listBox1->Items->Add(String::Concat("Creation Time = ", pFileProps->CreationTime.ToString()));
listBox1->Items->Add(String::Concat("Last Access Time = ", pFileProps->LastAccessTime.ToString()));
listBox1->Items->Add(String::Concat("Last Write Time = ", pFileProps->LastWriteTime.ToString()));
listBox1->Items->Add(String::Concat("Size = ", pFileProps->Length.ToString()));