Hello Everyone.
I have made an OOT module gr-ldpc. The ldpc encoder loads the parity check matrix data from a file. The constructor of this class takes as input the file name as parameter of type " const char * ".
I used following in param sector in the xml file.
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<param>
<name>File</name>
<key>alist_file</key>
<type>const char *</type>
</param>
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I also tried using the following
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<param>
<name>File</name>
<key>alist_file</key>
<type>str</type>
</param>
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To specify the file in the encoder block (in grc) I made a variable block and specified the file name within double quotes "file_name", and used the variable_id in place of the corresponding parameter in the encoder block. In both the cases the block is colored red and I can't run the flow-graph.