分析文本文件以提取字符串

Parsing a Text File To Extract a String

本文关键字：提取 字符串 文件 文本      更新时间：2023-10-16

我正在解析一个txt文件，我在其中放置了模板（GUID）来帮助识别数据块。。。我在解析文件中的STRING变量时遇到问题。在解析时，我使用了一个DataPtr对象，该对象根据数据类型的大小进行迭代。。。问题是，我无法正确计算字符串的大小，以便（在读取字符串后）转到下一个数据类型。以下是要解析的示例文件：

xof 0303txt 0032
template Effect {
  <C7D92586-6C57-42d3-8F03-0BDF87EC1848>
  STRING filename;
}
template Light {
  <ADA248C7-97E3-4a42-A4C1-74EE8536FF37>
  DWORD type;
  array float position[3];
  array float direction[3];
  array float ambient[4];
  array float diffuse[4];
  array float specular[4];
  float power;
}
template Object {
  <B6494248-7D84-42d3-A4AA-0747E22E08D3>
  DWORD type;  
  array float position[3];
  array float orientation[4];
  STRING name;
  STRING filename;
}
Effect {
    ".//Data/Scene/TrainingRoom/Effects/effect.fx";
}
Light {
    1;
    -3.0; 1.0; -3.0;
    3.0; -1.0; 3.0;
    1.0; 1.0; 1.0; 1.0;
    1.0; 0.0; 0.0; 0.0;
    1.0; 1.0; 1.0; 1.0;
    0.1;
}
Object {
    1;
    0.0; 0.0; 0.0;
    0.0; 0.0; 0.0; 1.0;
    ".//Data/Scene/TrainingRoom/TrainingRoom.x";
}

以下是当前正在工作的代码示例（不带字符串标签）：

if(CompareDataObjectType(pDataObj, TID_D3DRMLightCustom))
    {
        D3DXVECTOR3 *vecPtr = NULL;
        D3DXVECTOR4 *colorPtr = NULL;
        DWORD *DataPtr = (DWORD*)GetObjectData(pDataObj); // Data Pointer points at 1st data location
        m_light.type = *DataPtr++;  
        vecPtr = (D3DXVECTOR3*)DataPtr;
        m_light.position = *vecPtr;
        DataPtr+=3; 
        vecPtr = (D3DXVECTOR3*)DataPtr;
        m_light.direction = *vecPtr;
        DataPtr+=3;
        colorPtr = (D3DXVECTOR4*)DataPtr;
        m_light.ambient = *colorPtr;
        DataPtr+=4;
        colorPtr = (D3DXVECTOR4*)DataPtr;
        m_light.diffuse = *colorPtr;
        DataPtr+=4;
        colorPtr = (D3DXVECTOR4*)DataPtr;
        m_light.specular = *colorPtr;
        DataPtr+=4;
        float *fPtr = (float*)DataPtr;
        m_light.power = *fPtr;
        return true;
    }

这一切都好。。。以下返回不正确的结果：

if(CompareDataObjectType(pDataObj, TID_D3DRMObject))
    {
        D3DXVECTOR3 *vecPtr = NULL;
        D3DXQUATERNION *quatPtr = NULL;
        DWORD *DataPtr = (DWORD*)GetObjectData(pDataObj);       
        m_object.type = *DataPtr++; 
        vecPtr = (D3DXVECTOR3*)DataPtr;
        m_object.position = *vecPtr;
        DataPtr+=3;     
        quatPtr = (D3DXQUATERNION*)DataPtr;
        m_object.orientation = *quatPtr;
        DataPtr+=4;
        m_object.name = (LPCSTR)DataPtr;
        size_t length = strlen(m_object.name);
        DataPtr+=length;
        m_object.filename = (LPCSTR)DataPtr; // filename only contains a portion of the correct string...
        return true;
    }

如果输入数据包含以null结尾的字符串，则如下所示：

size_t length = strlen(m_object.name);
DataPtr+=length;

应说明空字符：

size_t length = strlen(m_object.name);
DataPtr += length + 1;
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