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  • win32

    该函数经常被用来处理UTF-8和ANSI格式的字符串,将它们转换为宽字节(UTF-16)

    #include <iostream>
    #include <Windows.h>
    #include <string>
    
    #define MAXBUFFERSIZE 1024
    
    using namespace std;
    
    int main()
    {
        DWORD windowStart = 0; DWORD windowEnd = 15; DWORD windowSize = 15; // buffer window containing tag candidate
        wstring windowCopy;
        DWORD bufferSize = MAXBUFFERSIZE;
        _int64 fileRemaining;
    
        HANDLE hFile;
        DWORD  dwBytesRead = 0;
        OVERLAPPED ol = { 0 };
        LARGE_INTEGER dwPosition;
    
        TCHAR* buffer = new TCHAR[MAXBUFFERSIZE];;
    
        hFile = CreateFileW(
            L"test.txt",         // file to open  其中包含UTF-8格式或者ANSI格式的文本
            GENERIC_READ,          // open for reading
            FILE_SHARE_READ | FILE_SHARE_WRITE,       // share for reading and writing
            NULL,                  // default security
            OPEN_EXISTING,         // existing file only
            FILE_ATTRIBUTE_NORMAL, // normal file    | FILE_FLAG_OVERLAPPED
            NULL);                 // no attr. template
    
        if (hFile == INVALID_HANDLE_VALUE)
        {
            wprintf(L"CreateFile");
            return 0;
        }
    
        LARGE_INTEGER size;
        GetFileSizeEx(hFile, &size);
    
        _int64 fileSize = (__int64)size.QuadPart;
        double gigabytes = fileSize * 9.3132e-10;
        wprintf(L"file size: %lld bytes (%.1f gigabytes)
    ", fileSize, gigabytes);
    
        fileRemaining = fileSize;
    
        wprintf(L"file remaining: %lld bytes
    ", fileRemaining);
    
        while (fileRemaining)                                       
        {
    
            if (bufferSize > fileRemaining)                       
                bufferSize = fileRemaining;
            memset(buffer, 0, fileSize);
            if (FALSE == ReadFile(hFile, buffer, bufferSize, &dwBytesRead, NULL))
            {
                wprintf(L"file read failed
    ");
                CloseHandle(hFile);
                return 0;
            }
    
            fileRemaining -= bufferSize;                            
            wprintf(L"outer loop
    ");
       
            while (windowEnd < bufferSize)            
            {
                windowSize = windowEnd - windowStart;
             
                wstring str(buffer);
                wstring sub = str.substr(windowStart, windowSize);
                TCHAR converted[60] = { 0 };
                MultiByteToWideChar(CP_ACP, MB_COMPOSITE, (LPCCH)sub.c_str(), -1, converted, 60);
                wprintf(L"windowStart:%d windowEnd:%d char:%s
    ", windowStart, windowEnd, converted);
                windowStart = windowEnd;
                windowEnd+=windowSize;
    
            }
        }  
    
        delete buffer;
    }
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  • 原文地址:https://www.cnblogs.com/strive-sun/p/14047760.html
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