使用按钮Win32 GUI更改值

Question

我正在使用CSV文件。我有一个显示带ID的数据的程序，但我需要用按钮和输入字段更改ID。现在我可以mannualy改变int i =＃;但我需要字段，用户输入他的号码，然后编程显示或更改数据。

case WM_PAINT:
    {


        hdc = BeginPaint(hwnd,&ps);
        TextOut(hdc,    5,        5,      txt_companyName,    _tcslen(txt_companyName));
        TextOut(hdc,    110,      5,      txt_programName,    _tcslen(txt_programName));
        /* Headers */
        TextOut(hdc,    5,        23,     txt_opened,         _tcslen(txt_opened));
        TextOut(hdc,    250,      23,     txt_time,           _tcslen(txt_time));
        TextOut(hdc,    290+15,   23,     txt_input,          _tcslen(txt_input));
        TextOut(hdc,    428+15,   23,     txt_time,           _tcslen(txt_time));
        TextOut(hdc,    468+25,   23,     txt_timeSpent,      _tcslen(txt_timeSpent));
        TextOut(hdc,    578+25,   23,     txt_timeRemain,     _tcslen(txt_timeRemain));
        /* Data printing in row */

        int i = 3;
        std::string data_component_label = getElementFromFileLine("data.csv",i,8,0);
        std::string data_component_mslLvl = getElementFromFileLine("data.csv",i,8,1);
        std::string data_component_opened = getElementFromFileLine("data.csv",i,8,2);
        std::string data_component_timeOpened = getElementFromFileLine("data.csv",i,8,3);
        std::string data_component_input = getElementFromFileLine("data.csv",i,8,4);
        std::string data_component_timeInput = getElementFromFileLine("data.csv",i,8,5);
        std::string data_component_timeSpent = getElementFromFileLine("data.csv",i,8,6);
        std::string data_component_timeRemain = getElementFromFileLine("data.csv",i,8,7);
        //std::string data_component_Status = getElementFromFileLine("data.csv",2,8,2);


        //TextOut(hdc,    5,        23+18,    data_component_opened,         _tcslen(data_component_opened));
        TextOut(hdc,    5,        23+18,    data_component_opened.c_str(),         _tcslen(data_component_opened.c_str()));
        TextOut(hdc,    250,      23+18,    data_component_timeOpened.c_str(),     _tcslen(data_component_timeOpened.c_str()));
        TextOut(hdc,    290+15,   23+18,    data_component_input.c_str(),          _tcslen(data_component_input.c_str()));
        TextOut(hdc,    428+15,   23+18,    data_component_timeInput.c_str(),      _tcslen(data_component_timeInput.c_str()));
        TextOut(hdc,    468+25,   23+18,    data_component_timeSpent.c_str(),      _tcslen(data_component_timeSpent.c_str()));
        TextOut(hdc,    578+25,   23+18,    data_component_timeRemain.c_str(),     _tcslen(data_component_timeRemain.c_str()));
        EndPaint(hwnd,&ps);
    }
    break;

我在WM_CREATE和WM_COMMAND中有一个按钮并输入，但是当我尝试在WM_PAINT中使用缓冲区时，例如在MessageBox中打印它，期望一个带有数据的消息框，用户输入，但是，有编译错误 -

  

main.cpp |错误：＆＃39;缓冲区＆＃39;未在此范围内声明

所以我需要以某种方式从WM_COMMAND获取数据到WM_PAINT

case WM_CREATE:
    {

        hEdit=CreateWindowEx(WS_EX_CLIENTEDGE,
            "EDIT",
            "",
            WS_CHILD|WS_VISIBLE|
            ES_MULTILINE|ES_AUTOVSCROLL|ES_AUTOHSCROLL,
            95,
            80,
            200,
            30,
            hwnd,
            (HMENU)IDC_MAIN_EDIT,
            GetModuleHandle(NULL),
            NULL);
        HGDIOBJ hfDefault=GetStockObject(DEFAULT_GUI_FONT);
        HWND hWndButton=CreateWindowEx(NULL,
            "BUTTON",
            "NEXT",
            WS_TABSTOP|WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,
            5,
            80,
            75,
            30,
            hwnd,
            (HMENU)IDC_MAIN_BUTTON,
            GetModuleHandle(NULL),
            NULL);

            SendMessage(hWndButton,
                WM_SETFONT,
                (WPARAM)hfDefault,
                MAKELPARAM(FALSE,0));


    }
        break;
case WM_COMMAND:
    switch(LOWORD(wParam))
    {
        case IDC_MAIN_BUTTON:
        {
            char buffer[265];

            SendMessage(hEdit,
                        WM_GETTEXT,
                        sizeof(buffer)/sizeof(buffer[0]),
                        reinterpret_cast<LPARAM>(buffer));

中断;