Question

我试图简单地将一个浮点值数组写入文件然后再读回来我曾尝试直接从数组中编写它，但是当读回它时，我一直为长度大于153的数组遇到问题。代码示例为了清晰起见逐个写入每个浮点值。

对于索引大于或等于153的值，它们的值为153.0，它们应为153.0,154.0,155.0，......

为什么这段代码对我不起作用？

  int length = 160;

  char* fileName = "testFile.dat";

  // Write data to file

  FILE* file = fopen (fileName, "w");

  for(int i = 0; i< length; i++){
    // We are just storing the indices, so value at i is equal to i
    float f = (float) i;
    fwrite(&f, sizeof(float), 1, file);
  }

  fclose(file);

  // Read data from file into results array

  file = fopen(fileName, "r");

  float* results = new float[length];

  for(int i = 0; i< length; i++){
    float f;
    fread(&f, sizeof(float), 1, file);
    results[i] = f;
  }

  fclose(file);

  // Now check data in results array

  bool fail = false;

  for(int i = 0; i< length; i++){
    if(results[i]!=(float)i){
      fail = true; // This should not be hit, but it is!
    }
  }

  delete [] results;

谢谢，戴夫

Answer 1

FILE* file = fopen (fileName, "wb");
FILE* file = fopen (fileName, "rb");

将浮点数组保存到二进制文件和回读的问题（C ++）

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