使用CreateEvent調用編譯C代碼時出錯

Question

如果我在Visual Studio 2005中編譯以下函數，則會收到一些編譯錯誤：

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;
    }
}

這些是我得到的錯誤：

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  

如果我注釋掉包含CreateEvent調用的行，則代碼將編譯而不會出現錯誤：

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;
    }


}

這些是我使用的標題：

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

我在Visual Studio 2005中將代碼編譯為C代碼（/ TC）。“ Btsdk_ui.h”文件是BlueSoleil藍牙堆棧的一部分，包括另一個包含BTUINT32和BTUINT16定義的文件。

歡迎所有建議。

Answer 1

在C語言中，您可以在塊的開頭聲明所有變量。

移動您的deviceEventHandle = CreateEvent(NULL, FALSE, FALSE, "foundDevice"); 到BTUINT變量塊之后。

Answer 2

編譯C代碼時，MSVC不允許將聲明與語句混合使用-聲明只能在代碼塊的開頭（MSVC與ANSI / ISO C90標准相比，緊跟C99標准）。

嘗試：

void search()
{

    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

    deviceEventHandle = CreateEvent(NULL, FALSE, FALSE, "foundDevice");

    Btsdk_StartDeviceDiscovery(deviceClass, maxDevices, maxDuration);

    WaitForSingleObject(deviceEventHandle, INFINITE);

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


}