Win32 处理command line参数列表

Windows编程，程序传参，参数分析代码

本代码主要是将文件类型参数和非文件类型参数分开。

typedef std::vector<const TCHAR*> ParamVector;

void parseCommandLine(TCHAR * commandLine, ParamVector & paramVector) {
    //params.erase(params.begin());    
    //remove the first element, since that is the path of the executable (GetCommandLine does that)
    //"D:\WinCE\PowerEditor\visual.net\Unicode Debug\bin\notepadPlus_Debug.exe" "D:\My Documents\code.txt"

    TCHAR stopChar = TEXT(' ');
    if (commandLine[0] == TEXT('\"')) {
        stopChar = TEXT('\"');
        commandLine++;
    }
    //after the first quote has been removed
    //D:\WinCE\PowerEditor\visual.net\Unicode Debug\bin\notepadPlus_Debug.exe" "D:\My Documents\code.txt"

    //while this is not really DBCS compliant, space and quote are in the lower 127 ASCII range
    while(commandLine[0] && commandLine[0] != stopChar)
    {
        commandLine++;
    }
    //after the argv[0] has been removed
    //" "D:\My Documents\code.txt"

    // For unknown reason, the following command :
    // c:\NppDir>notepad++
    // (without quote) will give string "notepad++\0notepad++\0"
    // To avoid the unexpected behavior we check the end of string before increasing the pointer
    if (commandLine[0] != '\0')
        commandLine++;    
    //after the past stopChar has been removed
    // "D:\My Documents\code.txt"

    //kill remaining spaces
    while(commandLine[0] == TEXT(' '))
        commandLine++;
    //finaly we got
    //"D:\My Documents\code.txt"

    bool isFile = checkSingleFile(commandLine);    //if the command line specifies only a file, open it as such
    if (isFile) {
        paramVector.push_back(commandLine);
        return;
    }
    bool isInFile = false;
    bool isInWhiteSpace = true;
    paramVector.clear();
    size_t commandLength = lstrlen(commandLine);
    for(size_t i = 0; i < commandLength; i++) {
        switch(commandLine[i]) {
            case '\"': {        //quoted filename, ignore any following whitespace
                if (!isInFile) {    //" will always be treated as start or end of param, in case the user forgot to add an space
                    paramVector.push_back(commandLine+i+1);    //add next param(since zero terminated generic_string original, no overflow of +1)
                }
                isInFile = !isInFile;
                isInWhiteSpace = false;
                //because we don't want to leave in any quotes in the filename, remove them now (with zero terminator)
                commandLine[i] = 0;
                break; }
            case '\t':    //also treat tab as whitespace
            case ' ': {
                isInWhiteSpace = true;
                if (!isInFile)
                    commandLine[i] = 0;        //zap spaces into zero terminators, unless its part of a filename
                break; }
            default: {                            //default TCHAR, if beginning of word, add it
                if (!isInFile && isInWhiteSpace) {
                    paramVector.push_back(commandLine+i);    //add next param 
                    isInWhiteSpace = false;
                }
                break; }
        }
    }
    //the command line generic_string is now a list of zero terminated strings concatenated, and the vector contains all the substrings
}

bool checkSingleFile(const TCHAR * commandLine) {
    TCHAR fullpath[MAX_PATH];
    ::GetFullPathName(commandLine, MAX_PATH, fullpath, NULL);
    if (::PathFileExists(fullpath)) {
        return true;
    }

    return false;
}