classogrfeature.html

gdal库的学习文档

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          <td class="memname">const char * OGRFeature::GetFieldAsString           </td>
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          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iField</em>          </td>
          <td>&nbsp;)&nbsp;</td>
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<p>
Fetch field value as a string.<p>
OFTReal and OFTInteger fields will be translated to string using sprintf(), but not necessarily using the established formatting rules. Other field types, or errors will result in a return value of zero.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#42acfd1f4b49dddc1c308462ae800c26">OGR_F_GetFieldAsString()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>iField</em>&nbsp;</td><td>the field to fetch, from 0 to <a class="el" href="classOGRFeature.html#b7f4eb0c098a9456d4005828127cdde0">GetFieldCount()</a>-1.</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>the field value. This string is internal, and should not be modified, or freed. It's lifetime may be very brief. </dd></dl>

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<a class="anchor" name="3f153cf4e2e6513b7df60f46ae8440bd"></a><!-- doxytag: member="OGRFeature::GetFieldAsIntegerList" ref="3f153cf4e2e6513b7df60f46ae8440bd" args="(int i, int *pnCount)" -->
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          <td class="memname">const int * OGRFeature::GetFieldAsIntegerList           </td>
          <td>(</td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iField</em>, </td>
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          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>pnCount</em></td><td>&nbsp;</td>
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<p>
Fetch field value as a list of integers.<p>
Currently this method only works for OFTIntegerList fields.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#c671852e05692c584b493b2acbd6b8ce">OGR_F_GetFieldAsIntegerList()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>iField</em>&nbsp;</td><td>the field to fetch, from 0 to <a class="el" href="classOGRFeature.html#b7f4eb0c098a9456d4005828127cdde0">GetFieldCount()</a>-1. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>pnCount</em>&nbsp;</td><td>an integer to put the list count (number of integers) into.</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>the field value. This list is internal, and should not be modified, or freed. It's lifetime may be very brief. If *pnCount is zero on return the returned pointer may be NULL or non-NULL. </dd></dl>

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<a class="anchor" name="8f799b9e9e44af526659b646bbfda870"></a><!-- doxytag: member="OGRFeature::GetFieldAsDoubleList" ref="8f799b9e9e44af526659b646bbfda870" args="(int i, int *pnCount)" -->
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          <td class="memname">const double * OGRFeature::GetFieldAsDoubleList           </td>
          <td>(</td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iField</em>, </td>
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          <td class="paramtype">int *&nbsp;</td>
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<p>
Fetch field value as a list of doubles.<p>
Currently this method only works for OFTRealList fields.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#4a27f74a38506ac492ec8b6e00eb58c9">OGR_F_GetFieldAsDoubleList()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>iField</em>&nbsp;</td><td>the field to fetch, from 0 to <a class="el" href="classOGRFeature.html#b7f4eb0c098a9456d4005828127cdde0">GetFieldCount()</a>-1. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>pnCount</em>&nbsp;</td><td>an integer to put the list count (number of doubles) into.</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>the field value. This list is internal, and should not be modified, or freed. It's lifetime may be very brief. If *pnCount is zero on return the returned pointer may be NULL or non-NULL. </dd></dl>

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<a class="anchor" name="84af9ea0a9af247581901ec95a890571"></a><!-- doxytag: member="OGRFeature::GetFieldAsStringList" ref="84af9ea0a9af247581901ec95a890571" args="(int i) const " -->
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          <td class="memname">char ** OGRFeature::GetFieldAsStringList           </td>
          <td>(</td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iField</em>          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%"> const</td>
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<p>
Fetch field value as a list of strings.<p>
Currently this method only works for OFTStringList fields.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#3e55ba4a06d4c4a392206518b390ac38">OGR_F_GetFieldAsStringList()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>iField</em>&nbsp;</td><td>the field to fetch, from 0 to <a class="el" href="classOGRFeature.html#b7f4eb0c098a9456d4005828127cdde0">GetFieldCount()</a>-1.</td></tr>
  </table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the field value. This list is internal, and should not be modified, or freed. It's lifetime may be very brief. </dd></dl>

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<a class="anchor" name="0262d9d3f0f9e18a1e2101e1972aebae"></a><!-- doxytag: member="OGRFeature::GetFieldAsBinary" ref="0262d9d3f0f9e18a1e2101e1972aebae" args="(int i, int *pnCount)" -->
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          <td class="memname">GByte * OGRFeature::GetFieldAsBinary           </td>
          <td>(</td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iField</em>, </td>
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          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>pnBytes</em></td><td>&nbsp;</td>
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<p>
Fetch field value as binary data.<p>
Currently this method only works for OFTBinary fields.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#72727f2f59d1defa01cedfb884df1a09">OGR_F_GetFieldAsBinary()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>iField</em>&nbsp;</td><td>the field to fetch, from 0 to <a class="el" href="classOGRFeature.html#b7f4eb0c098a9456d4005828127cdde0">GetFieldCount()</a>-1. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>pnBytes</em>&nbsp;</td><td>location to put the number of bytes returned.</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>the field value. This data is internal, and should not be modified, or freed. It's lifetime may be very brief. </dd></dl>

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<a class="anchor" name="6c5d2444407b07e07b79863c42ee7a49"></a><!-- doxytag: member="OGRFeature::GetFieldAsDateTime" ref="6c5d2444407b07e07b79863c42ee7a49" args="(int i, int *pnYear, int *pnMonth, int *pnDay, int *pnHour, int *pnMinute, int *pnSecond, int *pnTZFlag)" -->
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          <td class="memname">int OGRFeature::GetFieldAsDateTime           </td>
          <td>(</td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iField</em>, </td>
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          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>pnYear</em>, </td>
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          <td></td>
          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>pnMonth</em>, </td>
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          <td></td>
          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>pnDay</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>pnHour</em>, </td>
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          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>pnMinute</em>, </td>
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          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>pnSecond</em>, </td>
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          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>pnTZFlag</em></td><td>&nbsp;</td>
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<p>
Fetch field value as date and time.<p>
Currently this method only works for OFTDate, OFTTime and OFTDateTime fields.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#47ca681bb6099eb8c18004d1f7112d95">OGR_F_GetFieldAsDateTime()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>iField</em>&nbsp;</td><td>the field to fetch, from 0 to <a class="el" href="classOGRFeature.html#b7f4eb0c098a9456d4005828127cdde0">GetFieldCount()</a>-1. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>int</em>&nbsp;</td><td>pnYear (including century) </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>int</em>&nbsp;</td><td>pnMonth (1-12) </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>int</em>&nbsp;</td><td>pnDay (1-31) </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>int</em>&nbsp;</td><td>pnHour (0-23) </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>int</em>&nbsp;</td><td>pnMinute (0-59) </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>int</em>&nbsp;</td><td>pnSecond (0-59) </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>int</em>&nbsp;</td><td>pnTZFlag (0=unknown, 1=localtime, 100=GMT, see data model for details)</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>TRUE on success or FALSE on failure. </dd></dl>

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<a class="anchor" name="4abbe118cc2f3e48bbac7f710b71b531"></a><!-- doxytag: member="OGRFeature::SetField" ref="4abbe118cc2f3e48bbac7f710b71b531" args="(int i, int nValue)" -->
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