Worksheet::SelectRows

SelectRows

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 header to Include

Description

Select rows from worksheet based on a LabTalk condition expression

Syntax

int SelectRows( LPCSTR lpcszCondition, vector<uint> & vnRowIndices, int r1 = 0, int r2 = -1, int nMax = -1, LPCSTR lpcszBeforeLoopScript = NULL, LPCSTR lpcszBeforeIfScript = NULL, LPCSTR lpcszAfterIfScript = NULL, DWORD dwCntrl = 0, LPCSTR lpcszAfterLoopScript = NULL )

Parameters

lpcszCondition: [input] LabTalk conditional expression involving columns in the worksheet. LabTalk variable i is automatically declared and can be used for each row
vnRowIndices: [output] vector to receive the row indices, 0-offset. default is 0
r1: [input] starting row index, 0 offset. default is 0.
r2: [input] ending row index, 0 offset, inclusive, -1(by default) to indicate the end of data in worksheet
nMax: [input] optional maximum number of rows to select, -1(by default) to have no limit
lpcszBeforeLoopScript: [input] LabTalk script to be executed before the looping start, this is where you can make declarations to be used in lpcszCondition.; default is NULL.
lpcszBeforeIfScript: [input] LabTalk script to be executed before the if test, this is where you can use temp variable to build more complex conditions.; default is NULL.
lpcszAfterIfScript: [Input] LabTalk script to be executed after the if test, the if test result is in the an local int variable called _IF_TRUE.; default is NULL.
dwCntrl: [input] bits to control the conditional expression, Can be:; WKS_SELECT_ROWS_CHECK_IGNORE_HIDDEN_ROW,; WKS_SELECT_ROWS_XL_COLUMN_NAME.
lpcszAfterLoopScript: [input] LabTalk script to be executed after the looping end.; default is NULL.

Return

number of rows (size of vnRowIndices) if success, otherwise returns

-1 if lpcszCondition has syntax error

-2 if lpcszBeforeScript has syntax error

Examples

EX1

// example to test col(2) alias as a for missing values
// we first define the NULL const as 0/0 and then
// we setup alias a as col(2)
void Worksheet_SelectRows_Ex1(string strCond = "a==null", string strPre = "const null=0/0;range a=2")
{
    Worksheet wks("Book1");
    Worksheet wksDest("Book2");
    vector<uint> vnRowIndices;
    vector<uint> vnCols = {0,2};
    int nn = wks.SelectRows(strCond, vnRowIndices, 0, -1, -1, strPre);
    if(nn < 0)
        out_str("User cancel");
    else if(nn == 0)
        out_str("no matching row");
    else
    {
        BOOL bRet = wks.Extract(wksDest, vnRowIndices, vnCols);
        if(bRet)
            out_str("done");
    }
}

EX2

// example on how to select cells by matching text
// wildcard support is automatic if either * or ? characters are found in the
// testing string.
//
// To try, put data into a sheet with some text in col(2)
// this function can allow you to select rows by a string
// like
// Worksheet_SelectRows_Ex2 "my string"
// Worksheet_SelectRows_Ex2 *Boston*
void Worksheet_SelectRows_Ex2(string strCell = "*about*")
{
    string strPre = "range b=2";
    string strCond = "b==";
    strCond += "\"" + strCell + "\""; 
    Worksheet wks = Project.ActiveLayer();
    vector<uint> vnRowIndices;
    int nn = wks.SelectRows(strCond, vnRowIndices, 0, -1, -1, strPre);
    Grid gg;
    if(gg.Attach(wks))
    {
        vector<int> vnRows;
        vnRows = vnRowIndices;
        if(nn)
            gg.SetSelection(vnRows);
        else
            gg.SetSelection(NULL);
            
        out_int("Number of rows =", nn);
    }
}