Databases
StackOverflow2013
Postsdbo
POBad pointer type with a typedef
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POBad pointer type with a typedef
    primarykey
    data
    text
    <p>I'm having troubles when calling a function taking a pointer to a string as a parameter. I need to get an Element's name.</p> <pre><code>// method void getStringFromCsv( char ** str ); </code></pre> <p>Let me introduce the structures I'm working with (not written by me and part of a much bigger project, I can't modify them). </p> <pre><code>// typedefs typedef char T_CHAR64[64]; typedef T_CHAR64 T_SYMBOL; // generic element typedef struct Element { T_SYMBOL name; } T_Element; // csv element typedef struct CsvElement { Element * pElement; int id; } T_csvElement; </code></pre> <p>So, basically, I thought I would call the function like this :</p> <pre><code>T_Element * pData; // Not null, filled earlier getStringFromCsv( &amp;pData-&gt;pElement-&gt;name ); </code></pre> <p>But this doesn't work (warning: passing argument 1 of ‘STR_toCsv’ from incompatible pointer type). I'm using gcc with NetBeans 6.8. </p> <p>I tried many things...</p> <pre><code>T_SYMBOL foo = "foo"; T_SYMBOL * pFoo = &amp;foo; getStringFromCsv( pDef-&gt;name, &amp;pFoo ); // error : passing from incompatible pointer type T_CHAR * pBar = &amp;foo; // error : init from incompatible pointer type T_CHAR * pBaz = &amp;(foo[0]); // OK getStringFromCsv( pDef-&gt;name, &amp;pBaz ); // OK T_SYMBOL * pFooTest = &amp;(foo[0]); // error : init from incompatible pointer type </code></pre> <p>...but ended up casting name to a char ** :</p> <pre><code>getStringFromCsv( (char**) &amp;pData-&gt;pElement-&gt;name ); </code></pre> <p>What is wrong with my code ? Basically, SYMBOL = CHAR *, right ? Why is SYMBOL* != CHAR** ? I'm pretty sure I'm missing something simple but right now... Nothing came.</p> <p><strong>EDIT</strong> Here is getStringFromCsv :</p> <pre><code>void getStringFromCsv( char ** data ) { // pDesc is defined and not null csvDescriptorCat( pDesc, *data); csvDescriptorCat( pDesc, "\t"); } void csvDescriptorCat( CsvDescriptor * pDesc, char* str) { int len; if( str != NULL) { len = strlen(str); strcpy( &amp;pDesc-&gt;line[pDesc-&gt;pos], str); pDesc-&gt;pos += len; } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USunwind
    1. USIsaac Clarke
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POBad pointer type with a typedef
      1. USennuikiller
      1. VTFavorite
    2. VO
      singulars
      1. POBad pointer type with a typedef
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POBad pointer type with a typedef
      1. USIl-Bhima
      1. VTFavorite
    1. COShould be tagged c++
      singulars
      1. POBad pointer type with a typedef
      1. USpmod
    2. COI don't post as an answer since I would need to check what I say. But basically, SYMBOL = const char*, not char*. So SYMBOL* = const char** which is incompatible with char**.
      singulars
      1. POBad pointer type with a typedef
      1. USAlexandre C.
    3. CODid you try `&(pData->pElement->name)`?
      singulars
      1. POBad pointer type with a typedef
      1. USMark Elliot
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload