我有bitmao实例我将此实例转换为base64string并通过php函数将其发送到服务器。现在我正在解码此字符串并调用imagecreatefromstring，但此函数提供500内部服务器错误。我希望将此图像存储到文件中。
我的.net功能如下：
Bitmap icon = new Bitmap("C:\\Users\\HP\\Desktop\\mun.ico");
System.IO.MemoryStream stream = new System.IO.MemoryStream();
icon.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
byte[] imageBytes = stream.ToArray();
// Convert byte[] to Base64 String
string base64String = Convert.ToBase64String(imageBytes);
HttpWebRequest m_ObjRequest; //Request which needed to be sent to server
HttpWebResponse m_ObjResponse; // Response which is sent back from the server to the client
StreamReader reader = null; // making a stream reader to read the web pageand initialize it to null
string m_Url = "http://192.168.1.30/muneem/erp/uploadIcon.php"+ "?bitmap=" + base64String; // the url of that web page
string m_Response = "";
m_ObjRequest = (HttpWebRequest)WebRequest.Create(m_Url); // creating the url and setting the values
m_ObjRequest.Method = "GET";
m_ObjRequest.ContentType = "application/json; charset=utf-8";
//m_ObjRequest.ContentLength = 500;
m_ObjRequest.KeepAlive = false;
m_ObjResponse = (HttpWebResponse)m_ObjRequest.GetResponse(); // getting response from the server
using (reader = new StreamReader(m_ObjResponse.GetResponseStream())) // using stream reader to read the web page
{
m_Response = reader.ReadToEnd();
reader.Close(); // Close the StreamReader
}
m_ObjResponse.Close();
m_ObjRequest = null;
m_ObjResponse = null;
我处理这个编码位图字符串的PHP代码如下：
$位图= $ _ GET [＆＃39;位图＆＃39;]; $ data = base64_decode（$ bitmap）;
$ im = imagecreatefromstring（$ data）; if（$ im！== false）{ 标题（＆＃39;内容类型：image / png＆＃39;）; imagepng（$ IM）; imagedestroy（$ IM）; } 其他{ echo＆＃39;发生错误。＆＃39 ;; }
编码的位图字符串如下：
$位图=＆＃34; Qk02BAAAAAAAADYAAAAoAAAAEAAAABAAAAABACAAAAAAAAAAAADEDgAAxA4AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPasAP / 2rAD / AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA9qwA // asAP9L / 9V / S // B //尽快/ 2rAD / AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA9qwA / 0V / 2 / 9L / 9V / S // B / 0V / 2 / 9L / 9V / S // b // asAP8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPasAP9L / 9V / S // b / 0V / 2 / 9L / 9V / S // b / 0V / 2 // 2rAD / AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPasAP9L / 9V / S // b / 0V / 2 / 9L / 9V / S // b / 0V / 2 / 9L / 9V / S // b // asAP8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAD2rAD / S // b / 0V / 2 / 9L / 9V / S // b / 0V / 2 / 9L / 9V / S // b / 0V / 2 // 2rAD / AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPasAP9L / 9V / S // b / 0V / 2 / 9L / 9V / S // b / 0V / 2 // 2rAD / AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAD2rAD / S // b / 0V / 2 / 9L / 9V / S // b / 0V / 2 / 9L / 9V / 9qwA / wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPasAP / 2rAD / S // B / 0V / 2 // 2rAD / 9qwA / wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPasAP / 2rAD / AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ==＆＃34;
为什么我从string的imagecreate上得到这个错误？