ISAPI之Http返回不同的数据类型

在写ISAPI程序时，不同的情况可能需要返回不容的数据类型，例如有的http响应需要文本，有的可以是二进制更省流量，有的需要另存为某种文件，示例代码如下。

1返回文本，可以直接以网页的形式打开

DWORD ReturnText(LPEXTENSION_CONTROL_BLOCK pECB,const vector<char>& vecBody)
 {
 	char HeaderBuff[300];
 	DWORD dwBodySize = (DWORD)vecBody.size();
 	DWORD dwHeaderSize = (DWORD)sprintf_s(HeaderBuff,
 		"Content-Type: text/plain\r\n"
 		"Charset: utf-8\r\n"
 		"Cache-Control: no-store\r\n"
 		"Content-Length: %d\r\n\r\n",
 		dwBodySize);
 	if(!pECB->ServerSupportFunction(pECB->ConnID,HSE_REQ_SEND_RESPONSE_HEADER,NULL,&dwHeaderSize,(LPDWORD)HeaderBuff)) 
 	{
 		return HSE_STATUS_ERROR;
 	}
 
 	if (dwBodySize > 0)
 	{
 		if(!pECB->WriteClient(pECB->ConnID,(LPVOID)&vecBody[0],&dwBodySize,0)) 
 		{
 			return HSE_STATUS_ERROR;
 		}
 	}
 	return HSE_STATUS_SUCCESS;
 }

2返回某种文件格式的数据流，弹出保存文件窗口，可设置一个文件名称

DWORD ReturnCSV(LPEXTENSION_CONTROL_BLOCK pECB,const vector<byte>& vecBody, const string& strFileName)
 {
 	char HeaderBuff[300];
 	DWORD dwBodySize = (DWORD)vecBody.size();
 	DWORD dwHeaderSize = (DWORD)sprintf_s(HeaderBuff,
 		"Content-Type: application/vnd.ms-excel\r\n"
 		"Content-Disposition:filename=%s.csv\r\n"
 		"Charset: GB2312\r\n"
 		"Cache-Control: no-store\r\n"
 		"Content-Length: %d\r\n\r\n",
 		strFileName.c_str(), dwBodySize);
 	if(!pECB->ServerSupportFunction(pECB->ConnID,HSE_REQ_SEND_RESPONSE_HEADER,NULL,&dwHeaderSize,(LPDWORD)HeaderBuff)) 
 	{
 		return HSE_STATUS_ERROR;
 	}
 
 	if (dwBodySize > 0)
 	{
 		if(!pECB->WriteClient(pECB->ConnID,(LPVOID)&vecBody[0],&dwBodySize,0)) 
 		{
 			return HSE_STATUS_ERROR;
 		}
 	}
 	return HSE_STATUS_SUCCESS;
 }

3二进制，更省流量

DWORD ReturnBinary(LPEXTENSION_CONTROL_BLOCK pECB,const vector<byte>& vecBody)
 {
 	char HeaderBuff[300];
 	DWORD dwBodySize = (DWORD)vecBody.size();
 	DWORD dwHeaderSize = (DWORD)sprintf_s(HeaderBuff,
 		"Cache-Control: no-store\r\n"
 		"Content-Type: application/octet-stream\r\n"
 		"Content-Length: %d\r\n\r\n",
 		dwBodySize);
 	if(!pECB->ServerSupportFunction(pECB->ConnID,
 		HSE_REQ_SEND_RESPONSE_HEADER,NULL,&dwHeaderSize,(LPDWORD)HeaderBuff)) 
 	{
 		return HSE_STATUS_ERROR;
 	}
 
 	if (dwBodySize > 0)
 	{
 		if(!pECB->WriteClient(pECB->ConnID,(LPVOID)&vecBody[0],&dwBodySize,0))
 		{
 			return HSE_STATUS_ERROR;
 		}
 	}
 	return HSE_STATUS_SUCCESS;
 }