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c++ - 用c++编译c时出现链接错误

转载 作者：行者123 更新时间：2023-11-28 07:30:55 24 4
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我是编程新手，在使用串行 API 连接同步链接适配器的示例 C 代码时遇到问题。

我正在尝试使用 C++ 编译器 (Visual Studio C++ 2010) 编译 C 源文件。我更改了 C++ 编译器的设置以将项目编译为 C(在项目属性页下 -> C/C++ -> 高级)，并包括附加目录 mghdlc.h 和链接 mghdlc.lib(在链接器下 -> 附加)库目录)。代码如下:

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <windows.h>
#include <errno.h>

#include <mghdlc.h>

int get_port_id(char *name)
{
unsigned long i, rc, count;
int port_id = 0;
PMGSL_PORT ports;


/* get count of available ports */
rc = MgslEnumeratePorts(NULL, 0, &count);
if (rc != NO_ERROR) {
    printf("MgslEnumeratePorts() error=%d\n", rc);
    return 0;
}

if (!count)
    return 0;

/* allocate memory to hold port information */
ports = malloc(count * sizeof(MGSL_PORT));
if (ports == NULL) {
    printf("memory allocation failed\n");
    return 0;
}

/* get port information */
rc = MgslEnumeratePorts(ports, count * sizeof(MGSL_PORT), &count);
if (rc != NO_ERROR) {
    printf("MgslEnumeratePorts() error=%d\n", rc);
    goto done;
}

/* search for entry with matching name */
for (i=0; i < count; i++) {
    if (!_stricmp(ports[i].DeviceName, name)) {
        port_id = ports[i].PortID;
        break;
    }
}

done:
free(ports);
return port_id;
}

int stop_program = 0;

void sigint_handler(int sigid)
{
stop_program = 1;
}

int main(int argc, char **argv)
{
int port_id;
HANDLE fd;
FILE *fp;
DWORD rc;
int databuf_size;
int count;
int written;
OVERLAPPED ol;
MGSL_RECEIVE_REQUEST *rx_req;
MGSL_PARAMS params;

if (argc < 2) {
    printf("\nYou must specify device name as argument.\n"
           "Examples:\n"
           "C:>receive-raw MGMP4P2  (adapter #4 port #2 of multiport adapter)\n"
           "C:>receive-raw MGHDLC1  (single port adapter adapter #1)\n"
           "Available device names can be viewed in the SyncLink branch\n"
           "of the Windows device manager.\n\n");
    return 1;
}

printf("receive raw data on %s\n", argv[1]);

/* convert device name to port ID */
port_id = get_port_id(argv[1]);
if (port_id == 0) {
    printf("No such port %s\n", argv[1]);
    return 1;
}

/* open device */
rc = MgslOpen(port_id, &fd);
if (rc != NO_ERROR) {
    printf("MgslOpen error=%d\n", rc);
    return rc;
}

/* open file to store received data */
fp = fopen("data", "wb");
if (fp == NULL) {
    printf("fopen error=%d %s\n", errno, strerror(errno));
    return errno;
}

//#define SET_BASE_CLOCK 1  
#ifdef SET_BASE_CLOCK
/*
 * Set base clock frequency if custom hardware base clock installed.
 *
 * Use only if a base clock different than the standard 14745600
 * is installed at the factory. The driver uses this value to
 * calculate data clock rates which are derived from the base clock.
 */
rc = MgslSetOption(fd, MGSL_OPT_CLOCK_BASE_FREQ, 25000000);
if (rc != NO_ERROR)
    printf("MgslSetOption(MGSL_OPT_CLOCK_BASE_FREQ) error=%d\n", rc);
#endif

/* get current device parameters */
rc = MgslGetParams(fd, &params);
if (rc != NO_ERROR) {
    printf("MgslGetParams() error=%d\n", rc);
    return rc;
}

/*
 * configure port for raw synchronous mode
 * loopback disabled
 * receiver clock source = RxC clock input
 * transmit clock source = TxC clock input
 * encoding = NRZ
 * output clock on AUXCLK output at 19200 bps
 * disable ITU/CCITT CRC-16 frame checking (not supported in raw mode)
 */
params.Mode = MGSL_MODE_RAW;
params.Loopback = 0;
params.Flags = HDLC_FLAG_RXC_RXCPIN + HDLC_FLAG_TXC_TXCPIN;
params.Encoding = HDLC_ENCODING_NRZ;
params.ClockSpeed = 19200;
params.CrcType = HDLC_CRC_NONE;

/* set current device parameters */
rc = MgslSetParams(fd, &params);
if (rc != NO_ERROR) {
    printf("MgslSetParams() error=%d\n", rc);
    return rc;
}

/* set transmit idle pattern */
rc = MgslSetIdleMode(fd, HDLC_TXIDLE_ONES);
if (rc != NO_ERROR)
    printf("MgslSetIdleMode() error=%d", rc);

printf("Turn on RTS and DTR serial outputs\n");
rc = MgslSetSerialSignals(fd, SerialSignal_RTS + SerialSignal_DTR);
if (rc != NO_ERROR)
    printf("assert DTR/RTS error=%d\n", rc);

/* MgslReceive requires OVERLAPPED structure and event */
ol.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (ol.hEvent == NULL) {
    printf("CreateEvent error = %d\n", GetLastError());
    return 1;
}

/* MgslReceive needs MGSL_RECEIVE_REQUEST structure (header + data buffer) */
databuf_size = 128;
rx_req = malloc(sizeof(MGSL_RECEIVE_REQUEST) + databuf_size);
if (rx_req == NULL) {
    printf("can't allocate receive request structure\n");
    return 1;
}

MgslEnableReceiver(fd, 1); /* enable receiver */

signal(SIGINT, sigint_handler);
printf("press Ctrl-C to stop program\n");

while (!stop_program) {

    /* prepare for MgslReceive call */
    rx_req->DataLength = databuf_size;
    ResetEvent(ol.hEvent);

    rc = MgslReceive(fd, rx_req, &ol);

    if (rc == ERROR_IO_PENDING) {
        printf("wait for received data...");
        while (!stop_program) {
            rc = WaitForSingleObject(ol.hEvent, 100); 
            if (rc == WAIT_OBJECT_0)
                break; /* receive request complete */
            if (rc != WAIT_TIMEOUT) {
                printf("WaitForSingleObject error = %d\n",      GetLastError());
                return rc;
            }
        }
        if (stop_program) {
            printf("Ctrl-C pressed, cancel receive request\n");
            MgslCancelReceive(fd);
            break;
        }
    } else if (rc != NO_ERROR) {
        printf("MgslReceive error=%d\n", rc);
        return rc;
    }

    /* process completed receive request */

    if (rx_req->Status == RxStatus_OK) {
        count = rx_req->DataLength;
        printf("received %d bytes\n", count);
        /* write received data to file */
        written = (int)fwrite(rx_req->DataBuffer, sizeof(char), count, fp);
        if (written != count)
            printf("fwrite error=%d %s\n", errno, strerror(errno));
        fflush(fp);
    } else
        printf("receive error, status = %d\n", rx_req->Status);
}

MgslEnableReceiver(fd, 0); /* disable receiver */

printf("Turn off RTS and DTR ser`enter code here`ial outputs\n");
rc = MgslSetSerialSignals(fd, 0);
if (rc != NO_ERROR)
    printf("turn off DTR/RTS error=%d\n", rc);

MgslClose(fd); /* close device */
fclose(fp); /* close output file */

return 0;
}

但我得到以下错误:

1>------ Build started: Project: testing, Configuration: Debug Win32 ------
1>  testing.cpp
1>c:\users\jjteo\documents\visual studio    2010\projects\testing\testing\testing.cpp(124): warning C4996: 'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\stdio.h(234) : see declaration of 'fopen'
1>c:\users\jjteo\documents\visual studio 2010\projects\testing\testing\testing.cpp(126): warning C4996: 'strerror': This function or variable may be unsafe. Consider using strerror_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\string.h(157) : see declaration of 'strerror'
1>c:\users\jjteo\documents\visual studio 2010\projects\testing\testing\testing.cpp(241): warning C4996: 'strerror': This function or variable may be unsafe. Consider using strerror_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
 1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\string.h(157) : see declaration of 'strerror'
 1>testing.obj : error LNK2019: unresolved external symbol _MgslEnumeratePorts@12 referenced in function _get_port_id
 1>testing.obj : error LNK2019: unresolved external symbol _MgslClose@4 referenced in function _main
 1>testing.obj : error LNK2019: unresolved external symbol _MgslCancelReceive@4 referenced in function _main
 1>testing.obj : error LNK2019: unresolved external symbol _MgslReceive@12 referenced in function _main
 1>testing.obj : error LNK2019: unresolved external symbol _MgslEnableReceiver@8 referenced in function _main
 1>testing.obj : error LNK2019: unresolved external symbol _MgslSetSerialSignals@8 referenced in function _main
 1>testing.obj : error LNK2019: unresolved external symbol _MgslSetIdleMode@8 referenced in function _main
 1>testing.obj : error LNK2019: unresolved external symbol _MgslSetParams@8 referenced in function _main
 1>testing.obj : error LNK2019: unresolved external symbol _MgslGetParams@8 referenced in function _main
 1>testing.obj : error LNK2019: unresolved external symbol _MgslOpen@8 referenced in function _main
 1>c:\users\jjteo\documents\visual studio 2010\Projects\testing\Debug\testing.exe : fatal error LNK1120: 10 unresolved externals

========== 构建:0 成功，1 失败，0 最新，0 跳过 ==========

是不是用C++编译器编译c代码导致的问题？我该如何解决。谢谢。

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