Win 8 文件读写操作
啥也不说了，直接上代码。
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| #include <windows.h>;
#include <ppltasks.h>;
using namespace Platform;
using namespace Windows::Storage;
using namespace Windows::Storage::Streams;
using namespace Concurrency;
StorageFile^ openFile(String^ fileName)
{
StorageFile^ file = nullptr;
StorageFolder^ rootFolder = Windows::Storage::ApplicationData::Current->;LocalFolder;
task<StorageFile^>;(rootFolder->;GetFileAsync(fileName)).then([&]\(task<StorageFile^>; getFileTask\)
{
try
{
file = getFileTask.get();
}
catch (Platform::Exception^ e)
{
}
}).wait();
return file;
}
Array<byte>;^ getFileContent(String^ fileName)
{
Array<byte>;^ data = nullptr;
StorageFile^ file = openFile(fileName);
if (file)
{
task<IRandomAccessStream^>;(file->;OpenAsync(FileAccessMode::Read)).then([&]
(task<IRandomAccessStream^>; getStream)
{
auto readStream = getStream.get();
DataReader^ dataReader=ref new DataReader(readStream);
int length = readStream->;Size;
if (length >; 0)
{
data = ref new Array<byte>;(length);
task<unsigned int>;(dataReader->;LoadAsync(readStream->;Size)).then([&]\(task<unsigned
int>; loadTask\) {
loadTask.get();
dataReader->;ReadBytes(data);
}).wait();
}
}).wait();
}
return data;
}
bool setFileContent(String^ fileName, unsigned char* data, int size)
{
size_t totalWritten = 0;
bool complete = false;
StorageFile^ file = openFile(fileName);
if (file)
{
IRandomAccessStream^ readStream = nullptr;
task<IRandomAccessStream^>;(file->;OpenAsync(FileAccessMode::ReadWrite)).then([&]
(task<IRandomAccessStream^>; getStream)
{
readStream = getStream.get();
DataWriter^ dataWriter = ref new DataWriter(readStream);
Array<unsigned char>;^ arr = ref new Array<unsigned char>;(data, size);
dataWriter->;WriteBytes(arr);
task<unsigned int>;(dataWriter->;StoreAsync()).then([&]\(task<unsigned int>; writeTask)
{
try
{
totalWritten = writeTask.get();
} catch (Platform::Exception^ ex) {}
}).wait();
task<bool>;(dataWriter->;FlushAsync()).then([&]\(task<bool>; flushTask)
{
try
{
complete = flushTask.get();
} catch (Platform::Exception^ ex) {}
}).wait();
dataWriter->;DetachStream();
}).wait();
}
return complete;
}
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