QT mingw编译器下使用snap7库与西门子200smart-PLC（网口）通信实现代码

近期想要试一下QT与plc通信，正好朋友有个西门子200smart，于是乎~开整！
百度了会，发现有个博主写的qt通过snap7来与200smart通信的，那么就来配置snap7吧
首先去官网下载：https://sourceforge.net/projects/snap7/files/1.4.1/
我下载的是：snap7-full-1.4.1.zip

下载完后解压得到：

将snap7-full-1.4.1文件复制到项目文件内

在pro文件中添加下述代码

LIBS += E:Qt5.9.7Toolsmingw530_32i686-w64-mingw32liblibws2_32.a
LIBS += E:Qt5.9.7Toolsmingw530_32i686-w64-mingw32liblibwinmm.a

(这是我自己qt安装的路径，按自己qt安装路径来）

将此路径内的snap7.h和snap7.cpp，snap7.dll,snap7.lib文件复制到项目文件内，添加现有文件


添加完成后如下图：

继续添加现有文件，如下：

SOURCES += 
        main.cpp 
        mainwindow.cpp 
    snap7.cpp 
    snap7-full-1.4.1/src/core/s7_client.cpp 
    snap7-full-1.4.1/src/core/s7_isotcp.cpp 
    snap7-full-1.4.1/src/core/s7_micro_client.cpp 
    snap7-full-1.4.1/src/core/s7_partner.cpp 
    snap7-full-1.4.1/src/core/s7_peer.cpp 
    snap7-full-1.4.1/src/core/s7_server.cpp 
    snap7-full-1.4.1/src/core/s7_text.cpp 
    snap7-full-1.4.1/src/sys/snap_msgsock.cpp 
    snap7-full-1.4.1/src/sys/snap_sysutils.cpp 
    snap7-full-1.4.1/src/sys/snap_tcpsrvr.cpp 
    snap7-full-1.4.1/src/sys/snap_threads.cpp 
    snap7-full-1.4.1/src/lib/snap7_libmain.cpp

HEADERS += 
        mainwindow.h 
    snap7.h 
    snap7-full-1.4.1/src/core/s7_client.h 
    snap7-full-1.4.1/src/core/s7_firmware.h 
    snap7-full-1.4.1/src/core/s7_isotcp.h 
    snap7-full-1.4.1/src/core/s7_micro_client.h 
    snap7-full-1.4.1/src/core/s7_partner.h 
    snap7-full-1.4.1/src/core/s7_peer.h 
    snap7-full-1.4.1/src/core/s7_server.h 
    snap7-full-1.4.1/src/core/s7_text.h 
    snap7-full-1.4.1/src/core/s7_types.h 
    snap7-full-1.4.1/src/sys/snap_msgsock.h 
    snap7-full-1.4.1/src/sys/snap_platform.h 
    snap7-full-1.4.1/src/sys/snap_sysutils.h 
    snap7-full-1.4.1/src/sys/snap_tcpsrvr.h 
    snap7-full-1.4.1/src/sys/snap_threads.h 
    snap7-full-1.4.1/src/sys/sol_threads.h 
    snap7-full-1.4.1/src/sys/unix_threads.h 
    snap7-full-1.4.1/src/sys/win_threads.h 
    snap7-full-1.4.1/src/lib/snap7_libmain.h

鼠标右击项目->添加库->外部库

配置完成！

下面我们来写代码和plc通讯
.h

TS7Client *client;

.cpp
初始化

    client = new TS7Client();
    word type = 0x02;
    client->SetConnectionType(type);

建立连接：

    QString strip = ui->lineEdit->text();  // ip
    std::string stri = strip.toStdString();
    const char *ip = stri.c_str();
    qDebug() << "ip:" << ip << endl;
    int rack = ui->lineEdit_2->text().toInt();
    int slot = ui->lineEdit_3->text().toInt();
    int reg = client->ConnectTo(ip,rack,slot);
    if(reg == 0)
    {
        qDebug() << "success" << endl;
        QMessageBox::information(this,"提示","连接成功！");
        BYTE buffer[256];
        client->DBRead(1,100,1,&buffer);
        qDebug() << "success";
    }
    else
    {
        QMessageBox::information(this,"提示","连接失败");
        qDebug() << "failed";
    }

发送数据：

    int i     = ui->lineEdit_4->text().toInt();
    int plcZJ = ui->lineEdit_5->text().toInt();
    byte value[4];
    memset(value,0,sizeof(byte)*4);
    value[0] = (byte)(0xff & i);
    //value[1] = (byte)((0xff00 & i) >> 8);
    //value[2] = (byte) ((0xff0000 & i) >> 16);
    //value[3] = (byte) ((0xff000000 & i) >> 24);
    qDebug() << "value :" << value << endl;
    client->DBWrite(1,plcZJ,1,&value[0]);

构建时可能会提示有的头文件找不到，这需要在pro文件内添加上路径了：

INCLUDEPATH += ./snap7-full-1.4.1/release/Wrappers/c-cpp/ 
               ./snap7-full-1.4.1/src/lib/ 
               ./snap7-full-1.4.1/src/core/ 
               ./snap7-full-1.4.1/src/sys/

运行后，获取数据正常，发送更改plc内数据正常