c - 使用 CreateEvent 调用编译 C 代码时出错

Question

如果我在 Visual Studio 2005 中编译以下函数，我会遇到几个编译错误:

void search()
{
    deviceEventHandle = CreateEvent(NULL, FALSE, FALSE, "foundDevice");

    BTUINT32 deviceClass = 0; // 0 represents all classes 
    BTUINT16 maxDevices = 200; // 0 represents an unlimited number of responses
    BTUINT16 maxDuration = 45; // maxDuration * 1.28 = number of seconds
    Btsdk_StartDeviceDiscovery(deviceClass, maxDevices, maxDuration);

    WaitForSingleObject(deviceEventHandle, INFINITE);

    if (deviceEventHandle != NULL) {
        CloseHandle(deviceEventHandle);
        deviceEventHandle = NULL;
    }
}

这些是我得到的错误:

error C2275: 'BTUINT32' : illegal use of this type as an expression 
error C2146: syntax error : missing ';' before identifier 'deviceClass'     
error C2065: 'deviceClass' : undeclared identifier
error C2275: 'BTUINT16' : illegal use of this type as an expression     
error C2146: syntax error : missing ';' before identifier 'maxDevices'      
error C2065: 'maxDevices' : undeclared identifier   
error C2275: 'BTUINT16' : illegal use of this type as an expression     
error C2146: syntax error : missing ';' before identifier 'maxDuration'     
error C2065: 'maxDuration' : undeclared identifier  

如果我注释掉包含 CreateEvent 调用的行，代码将编译无误:

void search()
{
    //deviceEventHandle = CreateEvent(NULL, FALSE, FALSE, "foundDevice");

    BTUINT32 deviceClass = 0; // 0 represents all classes 
    BTUINT16 maxDevices = 200; // 0 represents an unlimited number of responses
    BTUINT16 maxDuration = 45; // maxDuration * 1.28 = number of seconds
    Btsdk_StartDeviceDiscovery(deviceClass, maxDevices, maxDuration);

    WaitForSingleObject(deviceEventHandle, INFINITE);

    if (deviceEventHandle != NULL) {
        CloseHandle(deviceEventHandle);
        deviceEventHandle = NULL;
    }


}

这些是我使用的 header :

#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <conio.h>
#include "Btsdk_ui.h"

我在 Visual Studio 2005 中将代码编译为 C 代码 (/TC)。“Btsdk_ui.h”文件是 BlueSoleil 蓝牙堆栈的一部分，并包含另一个包含 BTUINT32 和 BTUINT16 定义的文件。

欢迎所有建议。

Answer 1

在 C 中，您在 block 的开头声明所有变量。

将 deviceEventHandle = CreateEvent(NULL, FALSE, FALSE, "foundDevice"); 移到 BTUINT 变量 block 之后。