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# lrt_tptypes

Buffer Manipulation Functions

Determines information about a typed buffer.

long lrt_tptypes( char *ptr, char *type, char *subtype );

ptr | Pointer to the buffer.
type | Buffer type.
subtype | Buffer subtype.

The lrt_tptypes function determines information about a typed buffer.

## Return Values

If the function succeeds, it returns the type, subtype and size of the buffer. If the function fails, it returns -1 and sets tperrno to indicate the error condition.

## Parameterization

You cannot use standard parameterization for any arguments in this function.

## Example

In the following example, the lrt_tptypes function returns the length of the buffer data_1. The retrieved buffer length is then sent to the output.

vuser_init()

Copy code

    {
    char* data_0;
    char* data_1;
    long buflen;
    int cd;
    char string[] = "This is a string.";
    data_0 = lrt_tpalloc("STRING", "", sizeof(string));
    // Send a request, but cancel it afterwards
    lrt_strcpy(data_0, string);
    cd = lrt_tpacall("TOUPPER", data_0, 0, 0);
    lrt_tpcancel(cd);
    // Send a request, and look at reply
    data_1 = lrt_tpalloc("STRING", "", 1024);
    lrt_tpgetrply(&cd, &data_1, &olen, 0);
    buflen = lrt_tptypes(data_1, type, NULL);
    lr_output_message("The reply buffer type is %s, size is %lu.", type, buflen);
        return 0;

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