WinHttpSendRequest 返回 ERROR_INVALID_PARAMETER [英] WinHttpSendRequest returns ERROR_INVALID_PARAMETER

问题描述

我正在尝试让 betfair API 与 windows API 一起使用.>

我在尝试使用以下代码登录时卡住了(用户名和密码已更改).

char *headers = "X-Application: MakJhSABCDq8sbPIr\r\nAccept: application/json";char *usernameandpassword = "username=mick&password=xyz123";WinHttpSendRequest(请求，(LPCWSTR) 标头，-1,用户名和密码，strlen(用户名和密码)，strlen(用户名和密码)，0);

但调用返回的值为 ERROR_INVALID_PARAMETER.但我不知道哪个参数不好.

解决方案

LPCWSTR 作为 const wchar_t* 的 typedef.在 Windows 上，它使用 UTF-16 编码.基本上，您将 8 位 ASCII 字符串 (headers) 类型转换为 16 位宽的字符串，并告诉 WinHttpSendRequest() 计算字符串长度，因为它是不是有效的宽字符串.

对此的解决方案是首先使用适当的宽字符串:

const wchar_t *headers = L"X-Application: MakJhSABCDq8sbPIr\r\nAccept: application/json";

无论如何，用 char* 指向字符串文字是错误的，因为字符串文字是不可修改的，修改它们是未定义的行为.它应该总是 const.

I am attempting to get the betfair API working with windows API.

I am stuck attempting to login with the following code (username and passwords have been changed).

char *headers = "X-Application: MakJhSABCDq8sbPIr\r\nAccept: application/json";

char *usernameandpassword = "username=mick&password=xyz123";

WinHttpSendRequest(
                    hrequest,
                    (LPCWSTR)headers,
                    -1,
                    usernameandpassword,
                    strlen(usernameandpassword),
                    strlen(usernameandpassword),
                    0);

but the call is returning with the value ERROR_INVALID_PARAMETER. But I have no idea which parameter is bad.

解决方案

LPCWSTR as a typedef for const wchar_t*. On windows, that uses UTF-16 encoding. Basically, you are type-casting an 8bit ASCII string (headers) to a 16bit wide string, and telling WinHttpSendRequest() to calculate the string length, which fails since it is not a valid wide string.

A solution to this is to use a proper wide string for the first place:

const wchar_t *headers = L"X-Application: MakJhSABCDq8sbPIr\r\nAccept: application/json";

Anyway, pointing to a string literal with a char* is wrong, since string literals are not modifiable, modifying them is undefined behavior. It should always be const.

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