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POConversion of a char array to an int pointer
 

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  1. POConversion of a char array to an int pointer
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    <p>I have a string object called <code>Message</code> that is given a string such as:</p> <pre><code>Message = "Hello"; </code></pre> <p>Each character is then stored in a character array:</p> <pre><code>void Load() { Message.toUpperCase(); // Makes all the characters uppercase for (int T = 0; T &lt; Message.length(); T++) { Storage[T] = Message.charAt(T); } } </code></pre> <p>This part works fine.</p> <p>Now I want to call a function that needs to be passed a integer pointer pointing to an array that maps out the bit values needed to display a character on a 5*7 LED matrix.</p> <p>Normally I would be able to call <code>Display(H)</code> (<code>void Display(int Array[])</code>), and it would be fine. However, I want to use the string array so that it can be done automatically. The problem is that when using H normally it is seen as an integer pointer and it works great. Storage holds char's that are not pointers, and this creates problems.</p> <p>I have tried various ways of converting it, but all seem to fail. Is this even possible?</p> <p>This is what I have tried:</p> <pre><code>char to int: int w = int(Storage[L]); int* ww = &amp;w; </code></pre> <p>This compiles fine, but the output is all wrong. So I am not really sure how to take this further.</p> <p>Just to clarify, this works:</p> <pre><code>int A[] = {0x1B, 0x15, 0xE, 0xE, 0x0, 0xE, 0xE, 0xE}; Display(A); </code></pre> <p>But this does not:</p> <pre><code>String[L] = A; int w = int(Storage[L]); int* ww = &amp;w; Display(ww); </code></pre> <p>I'm probably doing something silly, but I can't see it.</p>
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    1. USPeter Mortensen
    1. USuser1798167
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    1. COCharacters in C and C++ are the ASCII values, so the character `'A'` is the value `65` which can't be used by as bit flags for the LED display. You have to make a conversion routine that takes a character and convert it to an array with the correct values. The simplest way is to have a conversion table, so you index it with the character value and get back a static constant array of the correct values.
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      1. USSome programmer dude
    2. COWhy not just replace `char Storage[?]` with `int Storage[?]` ? Your question really confuses me, I have no idea what you want to do..
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      1. USKoKuToru
    3. COWhat is the size of `char` and size of `int` in this context? And does the `Display()` function displays each char using its ASCII value?
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      1. USvvnraman
 

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