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    <p>Your code absolutely garbage. Some notes:</p> <p><strong>Use sizeof</strong></p> <p>Use sizeof(static_massive_name); or count_of_arr_elements * sizeof(arr_type); For example:</p> <pre><code>unsigned char src[255]; unsigned char dst[255]; // fill src with random data for (int i = 0; i &lt; 255; ++i) { src[i] = static_cast&lt;unsigned char&gt; (rand() % 255); } memcpy(src, dst, sizeof(dst)); // now dst will have copyed values from src (random numbers) </code></pre> <p><strong>UPDATE</strong>:</p> <p>Full source code for testing:</p> <pre><code>#include &lt;iostream&gt; #include &lt;string.h&gt; #include &lt;time.h&gt; #include &lt;stdlib.h&gt; using namespace std; void print(unsigned char* arr, size_t size) { for (size_t i = 0; i &lt; size; ++i) { // see type casting (to int)!!! cout &lt;&lt; "arr[" &lt;&lt; i &lt;&lt; "] = " &lt;&lt; (int)arr[i]&lt;&lt; endl; } } int main() { srand(time(0)); // unsigned char type hold values from 0 to 255 unsigned char src[15]; unsigned char dst[15]; for (int i = 0; i &lt; 15; ++i) { src[i] = rand() % 255; } memcpy(src, dst, sizeof(dst)); print(src, 15); print(dst, 15); return 0; } </code></pre> <p>result</p> <pre><code>arr[0] = 34 arr[1] = 80 arr[2] = 183 arr[3] = 112 arr[4] = 18 arr[5] = 120 arr[6] = 183 arr[7] = 0 arr[8] = 0 arr[9] = 0 arr[10] = 0 arr[11] = 57 arr[12] = 137 arr[13] = 4 arr[14] = 8 arr[0] = 34 arr[1] = 80 arr[2] = 183 arr[3] = 112 arr[4] = 18 arr[5] = 120 arr[6] = 183 arr[7] = 0 arr[8] = 0 arr[9] = 0 arr[10] = 0 arr[11] = 57 arr[12] = 137 arr[13] = 4 arr[14] = 8 </code></pre>
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    1. POc++ unsigned char memory copy
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    1. COI've tried that also, the result is the same: only the first char is copied.
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    2. COyour sample works just fine, applying the method to my code does not work.
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    3. CO1. If my code works fine, than system memcpy works fine 2. When you print unsigned char - be sure to make cast to int (if your code use c++) or printf (for C code): unsigned char var = 12; printf("var is = %d\n", (int) var);
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