private string getLngLat(string strLAC, string strCID)
{
string str;
try
{
HttpWebRequest length = (HttpWebRequest)WebRequest.Create(new Uri("http://www.google.com/glm/mmap"));
length.Method = "POST";
int num = Convert.ToInt32(strLAC);
byte[] numArray = AjaxFrm.PostData(num, Convert.ToInt32(strCID));
length.ContentLength = (long)((int)numArray.Length);
length.ContentType = "application/binary";
length.GetRequestStream().Write(numArray, 0, (int)numArray.Length);
HttpWebResponse response = (HttpWebResponse)length.GetResponse();
byte[] numArray1 = new byte[checked((IntPtr)response.ContentLength)]; // ERROR AT HERE
response.GetResponseStream().Read(numArray1, 0, (int)numArray1.Length);
if (response.StatusCode != HttpStatusCode.OK)
{
str = string.Format("Error {0}", response.StatusCode);
}
else
{
byte num1 = numArray1[0];
byte num2 = numArray1[1];
byte num3 = numArray1[2];
if ((numArray1[3] << 24 | numArray1[4] << 16 | numArray1[5] << 8 | numArray1[6]) != 0)
{
str = "";
}
else
{
double num4 = (double)(numArray1[7] << 24 | numArray1[8] << 16 | numArray1[9] << 8 | numArray1[10]) / 1000000;
double num5 = (double)(numArray1[11] << 24 | numArray1[12] << 16 | numArray1[13] << 8 | numArray1[14]) / 1000000;
str = string.Format("{0}&{1}", num5, num4);
}
}
}
catch (Exception exception)
{
str = string.Format("Error {0}", exception.Message);
}
return str;
}
byte[] numArray1 = new byte[checked((IntPtr)response.ContentLength)];
这里我得到了错误
错误 3 无法将类型“System.IntPtr”隐式转换为“int”。存在显式转换(您是否缺少强制转换?)
怎么会出现这个错误呢?怎么解决?
最佳答案
直接指定数组长度即可,无需先尝试转换为IntPtr
:
byte[] numArray1 = new byte[response.ContentLength];
IntPtr
是一种仅用于保存指针值的类型,因此整数类型的通常规则不适用。指针值不是合理的数组长度,因此语言设计者不允许使用 IntPtr
来指定数组长度。
关于C#.NET IntPtr 无效类型,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18224202/