How to generate Universally Unique IDentifier, UUID from LoadRunner independent of the OS

问题

I have experienced the need of generating UUID in LoadRunner several times while scripting but there is no in-build function to do so. I am using both linux and windows load generators.

Thanks to Scott Moore for writing the below code which uses windows in-build CoCreateGuid function (dependent on ole32.dll) to generate required UUID. However that code is completely dependent on windows platform and doesn't work in Linux platform.

How can we generate UUID from Loadrunner independent of OS?

    #include "lrun.h"
    #include "web_api.h"
    #include "lrw_custom_body.h"
    #include "stdlib.h"
    #include "stdio.h"
    #include "string.h"
    int lr_guid_gen()
    {
        typedef struct _GUID
        {
            unsigned long Data1;
            unsigned short Data2;
            unsigned short Data3;
            unsigned char Data4[8];
        } GUID;

        GUID m_guid;
        char buf[50];

        lr_load_dll ("ole32.dll");

        CoCreateGuid(&m_guid);

        sprintf (buf, "%08lx-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
        m_guid.Data1, m_guid.Data2, m_guid.Data3,
        m_guid.Data4[0], m_guid.Data4[1], m_guid.Data4[2], m_guid.Data4[3],
        m_guid.Data4[4], m_guid.Data4[5], m_guid.Data4[6], m_guid.Data4[7]);

        lr_save_string(buf, "PAR_GUID");

        return 0;
    }

回答1:

I have come up with the below mentioned solution

int lr_guid_gen()
{
    char GUID[40];
    int t = 0;
    char *szTemp = "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx";
    char *szHex = "0123456789abcdef-";
    int nLen = strlen (szTemp);


    for (t=0; t<nLen+1; t++)
    {
        int r = rand () % 16;
        char c = ' ';   

        switch (szTemp[t])
        {
            case 'x' : { c = szHex [r]; } break;
            case 'y' : { c = szHex [r & 0x03 | 0x08]; } break;
            case '-' : { c = '-'; } break;
            case '4' : { c = '4'; } break;
        }

        GUID[t] = ( t < nLen ) ? c : 0x00;
    }

    lr_save_string(GUID,"PAR_GUID");

    return 0;
}

回答2:

You can use the following trick which doesn't require any code. Define a hex parameter as follows:

Then use it with this code: lr_eval_string("{MyHex}{MyHex}-{MyHex}-{MyHex}-{MyHex}-{MyHex}{MyHex}{MyHex}")

来源：https://stackoverflow.com/questions/58202093/how-to-generate-universally-unique-identifier-uuid-from-loadrunner-independent

标签

performance-testing

uuid

guid

LoadRunner