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POAccess violation when using pin_ptr?
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  1. POAccess violation when using pin_ptr?
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    copied!<p>When I use pin_ptr to pass an array in native c code, I get access violation. The code is as bellow:</p> <pre><code>array&lt;float&gt;^ LogLikelihoodScore(array&lt;array&lt;unsigned char&gt;^&gt;^ modelsBuffer , array&lt;float&gt;^ featuresArray, int numberOfFrames) { int i, j, modelsNum = modelsBuffer-&gt;Length, len; float **models = (float**) malloc(modelsNum * sizeof(void*)); for(i = 0; i &lt; modelsNum; i++) { pin_ptr&lt;unsigned char&gt; ptr = &amp;modelsBuffer[i][0]; models[i] = (float*) ptr; } array&lt;float&gt;^ scores = gcnew array&lt;float&gt;(modelsNum); pin_ptr&lt;float&gt; scoresPtr = &amp;scores[0]; pin_ptr&lt;float&gt; featuresPtr = &amp;featuresArray[0]; char* message = CalculateLikelihoodUsingBufferedModels(models, modelsNum, featuresPtr, numberOfFrames, scoresPtr); return scores; } </code></pre> <p>When I changed this code such that allocate new spaces and copy original array to that, I didn't get access violation. New code:</p> <pre><code>array&lt;float&gt;^ LogLikelihoodScore(array&lt;array&lt;unsigned char&gt;^&gt;^ modelsBuffer , array&lt;float&gt;^ featuresArray, int numberOfFrames) { int i, j, modelsNum = modelsBuffer-&gt;Length, len; float **models = (float**) malloc(modelsNum * sizeof(void*)); for(i = 0; i &lt; modelsNum; i++) { len = modelsBuffer[i]-&gt;Length; char* ptr = (char*) malloc(len); pin_ptr&lt;unsigned char&gt; ptr2 = &amp;modelsBuffer[i][0]; memcpy(ptr, ptr2, len); models[i] = (float*) ptr; } array&lt;float&gt;^ scores = gcnew array&lt;float&gt;(modelsNum); pin_ptr&lt;float&gt; scoresPtr = &amp;scores[0]; pin_ptr&lt;float&gt; featuresPtr = &amp;featuresArray[0]; char* message = CalculateLikelihoodUsingBufferedModels(models, modelsNum, featuresPtr, numberOfFrames, scoresPtr); return scores; } </code></pre> <p>Question: Are there any problem in my using from pin_ptr?</p>
 

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