2.2.5.1.16 file::Write

Write

Description

Write data from a buffer into the file associated with the file object.

Syntax

UINT Write( const void * lpBuf, UINT nCount )

Parameters

lpBuf

[input] A buffer where the data to be written is stored.

nCount

[input] The number of bytes to write from the buffer to the file indicated by the File object. Carriage return-line feed character combinations are counted as one byte.

Return

The number of bytes written to the file from the buffer.

Examples

EX1

//write the 1st column of active worksheet with dataset
//assume all elements of the column are numeric.
int file_Write_ex1()
{
    file ff;
    bool bOK = ff.Open("C:\\test.txt", file::modeCreate | file::modeReadWrite);
    if(!bOK)
    {
        out_str("Failed to open file C:\test.txt");
        return 0;
    }
 
    Worksheet wks = Project.ActiveLayer();
    Column cc; 
    if(wks)
        cc = wks.Columns(0);
    else
		out_str("Iinvalid worksheet");
 
    //get data
    cc.SetInternalData(FSI_DOUBLE);
    Dataset ds(cc);
    int nDataSize = 5;
    ds.SetSize(nDataSize);
 
    //write data
    int nRead = ff.Write(ds, nDataSize * sizeof(double));
    return 1;            
}

EX2

int file_Write_ex2()
{
    file ff;
    bool bOK = ff.Open("C:\\test.txt", file::modeCreate | file::modeReadWrite);
    if(!bOK)
    {
        out_str("Failed to open file C:\test.txt");
        return 0;
    }
    int ia = 10;
    ff.Write(&ia, sizeof(ia));            //write 4 to file.
    int ib[4] = {1, 2, 3, 4};
    ff.Write(ib, sizeof(ib));            //write 1, 2, 3, 4 to file following previous 4.
 
    //write double
    double da = 123.345;
    ff.Write(&da, sizeof(da));
 
    //write structure
    WIN32_FIND_DATAA sa;
    memset(&sa, 0, sizeof(WIN32_FIND_DATAA));
    sa.dwFileAttributes = 20000;
    sa.ftCreationTime.dwLowDateTime = 10;
    sa.ftCreationTime.dwHighDateTime = 50;
    sa.ftLastAccessTime.dwLowDateTime = 100000;
    sa.ftLastAccessTime.dwHighDateTime = 500000;
    sa.ftLastWriteTime.dwLowDateTime = 1000;
    sa.ftLastWriteTime.dwHighDateTime = 5000;
    sa.nFileSizeHigh = 9000000;
    sa.nFileSizeLow = 1;
    sa.dwReserved0 = 600;
    sa.dwReserved1 = 98745;
    lstrcpy(sa.cFileName, "C:\\Origin70\\OriginC\\origin.h");
    lstrcpy(sa.cAlternateFileName,"originc.h");
    ff.Write(&sa, sizeof(sa));
 
    //write char array
    char ca[20] = "This is a string.";
    ff.Write(ca, sizeof(ca));
 
    //write vector
    vector<int> ik = {1, 2, 3, 4, 5};
    int size = sizeof(int) * ik.GetSize();
    ff.Write(ik, size);
	ff.Close(); 
    return 1;
}

Remark

See Also

File::Read, StdioFile::WriteString

Header to Include

origin.h