Question

我正在尝试在软件包中运行由公司（美国数字公司）提供的C演示程序。我已正确下载了所有软件，并使用了公司提供的确切演示程序和头文件，因此我假设代码没有任何问题。我是C的新手，所以我猜这是我的问题 - 我怀疑我没有正确地包括一个库或类似的东西。

以下文件也都由公司提供：

USB4.dll USB4.lib USB4.h

在演示C程序中，我使用#include包含USB4.h目录（具有正确的文件路径），这是我进入命令提示符窗口的行。（演示程序的名称是turtle，simple是包含turtle.c，USB4.dll，USB4.h和USB4.lib的文件夹）。

C:\simple> gcc turtle.c -lC:\simple\USB4.lib -o turtle.exe

我继续收到错误

在turtle.c：4：0中包含的文件中：C：\ simple \ USB4.h：222：79：错误：未知类型名称'USB4_FIFOBufferRecord'extern int _stdcall USB4_ReadFIFOBufferStrut（短iDeviceNo，long * plSize，USB4_FIFOBufferRecord * pCBR，unsigned long ulReadTimeout）;

我不明白为什么。（我看到类型名称没有在头文件中定义，但我不知道它将在何处定义）。如果您有任何想法或需要澄清，请告诉我。谢谢！

如果有帮助，这是我试图运行的演示程序：

#include "conio.h"
#include "stdio.h"
#include "windows.h"
#include "C:\simple\USB4.h"

int main(int argc, char* argv[]) 
{
    short iDeviceCount = 0;
    int iResult = 0;
    unsigned long ctrlmode = 0;
    unsigned long ulCount;
    unsigned long ulPrevCount = 0xFFFFFFFF;
    printf("--------------------------------\n");
    printf("USB4 Hello World!\n");
    printf("--------------------------------\n");
    // Initialize the USB4 driver.
    iResult = USB4_Initialize(&iDeviceCount);        // initialize the card
    // Check result code...
    if (iResult != USB4_SUCCESS) 
    {
        printf("Failed to initialize USB4 driver!  Result code = %d.\nPress any key to exit.\n",
                iResult);
        while( !_kbhit() ) 
        {
            Sleep(100);
        }
    } 
    else 
    {
        // Caution! The reset of the example is implemented without any error checking.

        // Configure encoder channel 0.
        USB4_SetPresetValue(0,0,499);       // Set the preset register to the CPR-1
        USB4_SetMultiplier(0,0,3);      // Set quadrature mode to X4.
        USB4_SetCounterMode(0,0,3);     // Set counter mode to modulo-N.
        USB4_SetForward(0,0,TRUE);      // Optional: determines the direction of counting.
        USB4_SetCounterEnabled(0,0,TRUE);   // Enable the counter.**IMPORTANT**
        USB4_ResetCount(0,0);           // Reset the counter to 0

        // USB4_SetControlMode(0,0,0xFC000); // You may replace the previous five   
        // lines with one call to USB4_SetControlMode using to correct control mode value.

        printf("Reading encoder channel 0. Press any key to exit.\n");
        // Waits for the user to press any key, then exits.
        while( !_kbhit() ) 
        {
        USB4_GetCount(0,0,&ulCount);
        // Update display when value changes
            if (ulPrevCount != ulCount) 
            {
            printf("%d    \r", ulCount);
            }
        ulPrevCount = ulCount;
        Sleep(1); // Don't want to hog all the CPU.
        }
    }
    // Close all open connections to the USB4 devices.
    USB4_Shutdown();

    return 0;
}

这是头文件：

// USB4.h : USB4 header file.

/*************************************************************************
|    Definitions                                                         |
*************************************************************************/

#define MAX_ERROR_MSG_LENGTH        512
#define MAX_INC_COUNTS              0x1000000
#define FAILURE                     FALSE       // must  be zero
#define SUCCESS                     TRUE
#define USB4_SUCCESS                0
#define USB4_MAX_ENCODERS           4       // max number of encoders per device.
#define USB4_MAX_DEVICES            32      // max devices on USB bus
#define USB4_MAX_ADDRESSES          32      // address can be any valid single byte value
#define USB4_MAX_ADC_CHANNELS       4       // max number of a/d channels.
#define USB4_FIFO_MAX_COUNT         196607  // max number of ChannelBufferRecords in FIFO.
#define USB4_RS232_BAUDBYTE_9600    0x00    // baud byte code used to set RS232 baud rate to 9600.
#define USB4_RS232_BAUDBYTE_19200   0x01    // baud byte code used to set RS232 baud rate to 19200.
#define USB4_RS232_BAUDBYTE_115200  0xFF    // baud byte code used to set RS232 baud rate to 115200.


//****** Error Codes ***************************/
#define DEVICE_NOT_OPEN                 -1
#define FAILED_TO_AQUIRE_MUTEX          -2
#define FAILED_TO_DOWNLOAD_FIRMWARE     -3
#define FATAL_ERROR                     -4
#define FIFO_BUFFER_EMPTY               -5
#define INVALID_A2D_CHANNEL             -6
#define INVALID_COUNTER_MODE            -7
#define INVALID_D2A_CHANNEL             -8
#define INVALID_D2A_MODE                -9
#define INVALID_DEVICE_NUMBER           -10
#define INVALID_ENCODER_NUMBER          -11
#define INVALID_MODULE_NUMBER           -12
#define INVALID_PARAMETER               -13
#define INVALID_QUADRATURE_MODE         -14
#define INVALID_REGISTER_NUMBER         -15
#define INVALID_SIGNAL_LENGTH_CODE      -16
#define MODULE_NUMBER_ALREADY_ASSIGNED  -17
#define MODULE_NUMBER_NOT_FOUND         -18
#define NO_AVAILABLE_MODULE_ADDRESSES   -19
#define USB4_INVALID_D2A_VALUE          -20
#define RX_232_FAILURE                  -30
#define TX_232_FAILURE                  -31
#define NO_DEVICES_FOUND                -32
#define OLD_FIRMWARE_DETECTED           -33
#define INSUFFICIENT_MEMORY_AVAILABLE   -34

//****** REGISTERS *****************************/
#define PRESET_REGISTER                     0
#define OUTPUT_LATCH_REGISTER               1
#define MATCH_REGISTER                      2
#define CONTROL_REGISTER                    3
#define STATUS_REGISTER                     4
#define COUNTER_REGISTER                    5  // Renamed from        RESET_CHANNEL_REGISTER
#define RESET_CHANNEL_REGISTER              5  // Not currently used.
#define TRANSFER_PRESET_REGISTER            6
#define CMD_REGISTER                        7
#define TIMESTAMP_OUTPUT_LATCH_REGISTER     15
#define TIMESTAMP_REGISTER                  23
#define ADC01_TRIGGER_CONTROL_REGISTER      24
#define ADC23_TRIGGER_CONTROL_REGISTER      25
#define ENCODER_TYPE_REGISTER               26
#define INPUT_TRIGGER_CONTROL_REGISTER      27
#define INPUT_TRIGGER_STATUS_REGISTER       28
#define SAMPLING_RATE_MULTIPLIER_REGISTER   30
#define SAMPLING_RATE_COUNTER_REGISTER      31
#define USB_PWM0_TRIGGER_CONTROL_REGISTER   32
#define USB_PWM1_TRIGGER_CONTROL_REGISTER   33
#define USB_PWM2_TRIGGER_CONTROL_REGISTER   34
#define USB_PWM3_TRIGGER_CONTROL_REGISTER   35
#define FIFO_ON_OFF_REGISTER                37
#define FIFO_STATUS_CONTROL_REGISTER        38
#define FIFO_BUFFER_COUNT                   39
#define INPUT_PORT_REGISTER                 40
#define INPUT_TRIGGER1_SETUP_REGISTER       41
#define INPUT_TRIGGER2_SETUP_REGISTER       42
#define SAMPLES_TO_COLLECT_REGISTER         43
#define SAMPLES_REMAINING_TO_COLLECT_REGISTER   44
#define AQUISITION_CONTROL_REGISTER         45
#define OUTPUT_PORT_REGISTER                46
#define OUTPUT_PORT_SETUP_REGISTER          47
#define USB4_ENCODER3_BASE                  48
#define USB4_A2D_BASE_REGISTER              55
#define USB4_A2D_CHANNEL0_REGISTER          55
#define USB4_A2D_CHANNEL1_REGISTER          56
#define USB4_A2D_CHANNEL2_REGISTER          57
#define USB4_A2D_CHANNEL3_REGISTER          58
#define USB4_D2A_CONTROL_REGISTER           59
#define USB4_PW0_REGISTER                   60
#define USB4_PER0_REGISTER                  61   
#define USB4_PW1_REGISTER                   62
#define USB4_PER1_REGISTER                  63
#define USB4_PW2_REGISTER                   64
#define USB4_PER2_REGISTER                  65
#define USB4_PW3_REGISTER                   66
#define USB4_PER3_REGISTER                  67


//****** Status Register Bits ******************/       // bit  6-0 reserved
#define STATUS_BIT_LATCHED_ZERO_DETECTED    0x00000080  // bit  7
#define STATUS_BIT_LATCHED_MATCH_DETECTED   0x00000100  // bit  8
#define STATUS_BIT_LATCHED_CARRY_DETECTED   0x00000200  // bit  9
#define STATUS_BIT_LATCHED_BORROW_DETECTED  0x00000400  // bit 10
#define STATUS_BIT_LATCHED_INDEX_DETECTED   0x00000800  // bit 11
#define STATUS_BIT_LATCHED_ADVANCE_DETECTED 0x00001000  // bit 12
#define STATUS_BIT_LATCHED_RETARD_DETECTED  0x00002000  // bit 13
#define STATUS_BIT_ZERO_DETECTED            0x00004000  // bit 14
#define STATUS_BIT_MATCH_DETECTED           0x00008000  // bit 15 
#define STATUS_BIT_CARRY_DETECTED           0x00010000  // bit 16
#define STATUS_BIT_BORROW_DETECTED          0x00020000  // bit 17
#define STATUS_BIT_INDEX_DETECTED           0x00040000  // bit 18
#define STATUS_BIT_ADVANCE_DETECTED         0x00080000  // bit 19
#define STATUS_BIT_RETARD_DETECTED          0x00100000  // bit 20
                                                    // bit 22-21 reserved
#define STATUS_BIT_LAST_DIRECTION_INDICATOR 0x08000000  // bit 23           
                                                    // bit 31-24 reserved

//****** Control Register Bits ******************/          // bit  6-0
#define CONTROL_BIT_INDEX_ENABLE_ON_MATCH       0x00000010  // bit  4
#define CONTROL_BIT_TRIGGER_ON_ZERO             0x00000080  // bit  7
#define CONTROL_BIT_TRIGGER_ON_MATCH            0x00000100  // bit  8
#define CONTROL_BIT_TRIGGER_ON_ROLLOVER         0x00000200  // bit  9
#define CONTROL_BIT_TRIGGER_ON_ROLLUNDER        0x00000400  // bit 10
#define CONTROL_BIT_TRIGGER_ON_INDEX            0x00000800  // bit 11
#define CONTROL_BIT_TRIGGER_ON_INCREASE         0x00001000  // bit 12
#define CONTROL_BIT_TRIGGER_ON_DECREASE         0x00002000  // bit 13
#define CONTROL_BITS_MULTIPLIER                 0x0000C000  // bits 14 & 15
#define CONTROL_BITS_COUNTER_MODE               0x00030000  // bits 16 & 17
#define CONTROL_BIT_COUNTER_ENABLE              0x00040000  // bit 18
#define CONTROL_BIT_COUNT_DIRECTION             0x00080000  // bit 19
#define CONTROL_BIT_INDEX_ENABLE                0x00100000  // bit 20
#define CONTROL_BIT_INVERT_INDEX                0x00200000  // bit 21
#define CONTROL_BIT_COUNTER_RESET_OR_PRESET     0x00400000  // bit 22
#define CONTROL_BIT_ENABLE_CAPTURE              0x00800000  // bit 23
                                                        // bit 31-24 reserved

//******* Input Port Register Bits ***************/  
#define INPUT_PORT_ESTOP                        0x00000100  // bit 8

//******* Output Port Configuration Bits ***************/
#define INVERT_OUTPUT_POLARITY                  0x00000020  // bit 5


#ifdef __cplusplus 
extern "C"{ 
#endif 

struct USB4_FIFOBufferRecord
{
    unsigned char Header[6];
    unsigned char Input;
    unsigned char EStop;
    unsigned long Time;
    unsigned long Count[4];
    unsigned char Status[4];
    unsigned short ADC[4];
};

extern int _stdcall USB4_CaptureTimeAndCounts(short iDeviceNo, unsigned long *pulCounts, unsigned long *pulTimeStamp);
extern int _stdcall USB4_ClearCapturedStatus(short iDeviceNo, short iEncoder);
extern int _stdcall USB4_ClearDigitalInputTriggerStatus(short iDeviceNo);
extern int _stdcall USB4_ClearFIFOBuffer(short iDeviceNo);
extern int _stdcall USB4_DeviceCount();
extern int _stdcall USB4_DisableFIFOBuffer(short iDeviceNo);
extern int _stdcall USB4_EnableFIFOBuffer(short iDeviceNo);
extern int _stdcall USB4_GetA2D(short iDeviceNo, short iA2DChannel, unsigned short * puiA2DValue);
extern int _stdcall USB4_GetA2DSamplingFrequency(short iDeviceNo, unsigned short * puiVal);
extern int _stdcall USB4_GetCaptureEnabled(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetControlMode(short iDeviceNo, short iEncoder, unsigned long *pulVal);
extern int _stdcall USB4_GetCount(short iDeviceNo, short iEncoder, unsigned long *pulVal);
extern int _stdcall USB4_GetCounterMode(short iDeviceNo, short iEncoder, short *piVal);
extern int _stdcall USB4_GetDeviceNo(short iModuleAddress, short *piDeviceNo);
extern int _stdcall USB4_GetDigitalInputTriggerConfig(short iDeviceNo, BOOL *pbEnableTrigger, BOOL *pbTriggerOnRisingEdge);
extern int _stdcall USB4_GetDigitalInputTriggerStatus(short iDeviceNo, BOOL *pbVal);
extern int _stdcall USB4_GetDriverBuildNumber(short iDeviceNo, unsigned char *pucVersion);
extern int _stdcall USB4_GetCounterEnabled(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetEnableIndex(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetEnableIndexOnMatch(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetEStopBit(short iDeviceNo, unsigned char *pucVal);
extern int _stdcall USB4_GetFactoryInfo(short iDeviceNo, unsigned short *puiModel, unsigned short *puiVersion, unsigned long *pulSN, unsigned char *pucMonth, unsigned char *pucDay, unsigned short *pusYear);
extern int _stdcall USB4_GetFIFOBufferCount(short iDeviceNo, unsigned long *plVal);
extern int _stdcall USB4_GetForward(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetInterruptControl(short iDeviceNo, BOOL *pbEnableFIFOHalfFullInterrupt, BOOL *pbEnableTriggerOutInterrupt);
extern int _stdcall USB4_GetInvertIndex(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetInvertOutput(short iDeviceNo, BOOL *pbVal);
extern int _stdcall USB4_GetMatch(short iDeviceNo, short iEncoder, unsigned long *pulVal);
extern int _stdcall USB4_GetModuleAddress(short iDeviceNo, unsigned char *pucModuleAddress);
extern int _stdcall USB4_GetMultiplier(short iDeviceNo, short iEncoder, short *piVal);
extern int _stdcall USB4_GetOutputPortConfig(short iDeviceNo, BOOL *pbTriggerOutSignalDrivesOutputPin, unsigned char *pucTriggerSignalLengthCode);
extern int _stdcall USB4_GetPresetOnIndex(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetPresetValue(short iDeviceNo, short iEncoder, unsigned long *pulVal);
extern int _stdcall USB4_GetPWM(short iDeviceNo, short iPWMChannel, unsigned long *pulPulseWidth, unsigned long *pulPulsePeriod);
extern int _stdcall USB4_GetPWMConfig(short iDeviceNo, unsigned char *pucDivisor, unsigned char *pucCaptureToFIFOFlags);
extern int _stdcall USB4_GetROM_ID(short iDeviceNo, unsigned char *pucVal);
extern int _stdcall USB4_GetRPM(short iDeviceNo, short iEncoder, float *pufRPM);
extern int _stdcall USB4_GetSamplesRemaining(short iDeviceNo, unsigned long *pulVal);
extern int _stdcall USB4_GetSamplesToCollect(short iDeviceNo, unsigned long *pulVal);
extern int _stdcall USB4_GetSamplingRateCounter(short iDeviceNo, unsigned long *pulVal);
extern int _stdcall USB4_GetSamplingRateMultiplier(short iDeviceNo, unsigned long *pulVal);
extern int _stdcall USB4_GetStatus(short iDeviceNo, short iEncoder, unsigned long *pulVal);
extern int _stdcall USB4_GetStatusEx(short iDeviceNo, short iEncoder, BOOL *pbDecreaseDetected, BOOL *pbIncreaseDetected, BOOL *pbIndexDetected, BOOL *pbRollunderDetected, BOOL *pbRolloverDetected, BOOL *pbMatchDetected, BOOL *pbZeroDetected);
extern int _stdcall USB4_GetTimeBasedLogSettings(short iDeviceNo, unsigned char * pucInputTrigger1Array, unsigned char * pucInputTrig1And,
                                          unsigned char * pucInputTrigger2Array, unsigned char * pucInputTrig2And,
                                          unsigned char * pucADCTrigger, unsigned short * puiADCThreshold,
                                          unsigned char * pucPWMTrigger, unsigned long  * pulPWMThreshold,
                                          unsigned char * pucEncoderChannels, unsigned long * pulNumberOfSamples);
extern int _stdcall USB4_GetTimeStamp(short iDeviceNo, unsigned long *pulVal);
extern int _stdcall USB4_GetTriggerOnDecrease(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetTriggerOnIncrease(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetTriggerOnIndex(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetTriggerOnMatch(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetTriggerOnRollover(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetTriggerOnRollunder(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetTriggerOnZero(short iDeviceNo, short iEncoder, BOOL *pbVal);
extern int _stdcall USB4_GetVersion(short iDeviceNo, unsigned short *puiVersion);
extern int _stdcall USB4_Initialize(short *pDeviceCount);
extern BOOL _stdcall USB4_IsFIFOBufferEmpty(short iDeviceNo, int *piResult);
extern BOOL _stdcall USB4_IsFIFOBufferFull(short iDeviceNo, int * piResult);
extern int _stdcall USB4_PresetCount(short iDeviceNo, short iEncoder);
extern int _stdcall USB4_ReadFIFOBuffer(short iDeviceNo, long *plSize, unsigned long * pTime, unsigned long * pCount0, unsigned long * pCount1, unsigned long * pCount2, unsigned long * pCount3, unsigned char * pStatus0, unsigned char * pStatus1, unsigned char * pStatus2, unsigned char * pStatus3, unsigned char * pInput, unsigned char * pEStop, unsigned long * pADC0, unsigned long * pADC1, unsigned long * pADC2, unsigned long * pADC3, unsigned long ulReadTimeout);
extern int _stdcall USB4_ReadFIFOBufferStruct(short iDeviceNo, long *plSize, USB4_FIFOBufferRecord *pCBR, unsigned long ulReadTimeout);
extern int _stdcall USB4_ReadInputPortRegister(short iDeviceNo, unsigned char *pucVal);
extern int _stdcall USB4_ReadOutputLatch(short iDeviceNo, short iEncoder, unsigned long *pulVal);
extern int _stdcall USB4_ReadOutputPortRegister(short iDeviceNo, unsigned char *pucVal);
extern int _stdcall USB4_ReadRegister(short iDeviceNo, short iRegister, unsigned long *pulVal);
extern int _stdcall USB4_ReadSavedParameters(short iDeviceNo);
extern int _stdcall USB4_ReadTimeAndCounts(short iDeviceNo, unsigned long *pulCounts, unsigned long *pulTimeStamp);
extern int _stdcall USB4_ReadTimeStamp(short iDeviceNo, unsigned long *pulVal);
extern int _stdcall USB4_ReadUnlatchedTimeAndCounts(short iDeviceNo, unsigned long *pulCounts, unsigned long *pulTimeStamp);
extern int _stdcall USB4_ReadUserEEPROM(short iDeviceNo, unsigned char ucStartAddress, unsigned char ucBytesToRead, unsigned char * pucDataArray);
extern int _stdcall USB4_ResetCount(short iDeviceNo, short iEncoder);
extern int _stdcall USB4_ResetTimeStamp(short iDeviceNo);
extern int _stdcall USB4_RestoreFactoryParameters(short iDeviceNo);
extern int _stdcall USB4_SaveParameters(short iDeviceNo);
extern int _stdcall USB4_SetA2DSamplingFrequency(short iDeviceNo, unsigned short uiVal);
extern int _stdcall USB4_SetCaptureEnabled(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetControlMode(short iDeviceNo, short iEncoder, unsigned long ulVal);
extern int _stdcall USB4_SetCount(short iDeviceNo, short iEncoder, unsigned long ulVal);
extern int _stdcall USB4_SetCounterMode(short iDeviceNo, short iEncoder, short iVal);
extern int _stdcall USB4_SetD2A(short iDeviceNo, short iChannel, unsigned short iD2AValue, BOOL bUpdateD2AChannelsNow);
extern int _stdcall USB4_SetD2AControlMode(short iDeviceNo, unsigned char ucMode);
extern int _stdcall USB4_SetDigitalInputTriggerConfig(short iDeviceNo, BOOL *pbEnableTrigger, BOOL *pbTriggerOnRisingEdge);
extern int _stdcall USB4_SetCounterEnabled(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetEnableIndex(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetEnableIndexOnMatch(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetEStopBit(short iDeviceNo, unsigned char bVal);
extern int _stdcall USB4_SetForward(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetInvertIndex(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetInvertOutput(short iDeviceNo, BOOL bVal);
extern int _stdcall USB4_SetMatch(short iDeviceNo, short iEncoder, unsigned long ulVal);
extern int _stdcall USB4_SetModuleAddress(short iDeviceNo, unsigned char ucModuleAddress);
extern int _stdcall USB4_SetMultiplier(short iDeviceNo, short iEncoder, short iVal);
extern int _stdcall USB4_SetOutputPortConfig(short iDeviceNo, BOOL *pbTriggerOutSignalDrivesOutputPin, unsigned char ucTriggerSignalLengthCode);
extern int _stdcall USB4_SetPresetOnIndex(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetPresetValue(short iDeviceNo, short iEncoder, unsigned long ulVal);
extern int _stdcall USB4_SetPWMConfig(short iDeviceNo, unsigned char pucDivisor, unsigned char ucCaptureToFIFOFlags);
extern int _stdcall USB4_SetSamplesToCollect(short iDeviceNo, unsigned long ulVal);
extern int _stdcall USB4_SetSamplingRateMultiplier(short iDeviceNo, unsigned long ulVal);
extern int _stdcall USB4_SetTimeBasedLogSettings(short iDeviceNo, unsigned char * pucInputTrigger1Array, unsigned char ucInputTrig1And, 
                                          unsigned char * pucInputTrigger2Array, unsigned char ucInputTrig2And, 
                                          unsigned char * pucADCTrigger, unsigned short * puiADCThreshold, 
                                          unsigned char * pucPWMTrigger, unsigned long  * pulPWMThreshold, 
                                          unsigned char ucEncoderChannels, unsigned long ulNumberOfSamples);
extern int _stdcall USB4_SetTriggerOnDecrease(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetTriggerOnIncrease(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetTriggerOnIndex(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetTriggerOnMatch(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetTriggerOnRollover(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetTriggerOnRollunder(short iDeviceNo, short iEncoder, BOOL bVal);
extern int _stdcall USB4_SetTriggerOnZero(short iDeviceNo, short iEncoder, BOOL bVal);
extern void _stdcall USB4_Shutdown();
extern int _stdcall USB4_StartAcquisition(short iDeviceNo);
extern int _stdcall USB4_StopAcquisition(short iDeviceNo);
extern int _stdcall USB4_TriggerSoftwareCapture(short iDeviceNo);
extern int _stdcall USB4_WriteOutputPortRegister(short iDeviceNo, unsigned char ucVal);
extern int _stdcall USB4_WriteRegister(short iDeviceNo, short iRegister, unsigned long ulVal);
extern int _stdcall USB4_WriteUserEEPROM(short iDeviceNo, unsigned char startAddress, unsigned char bytesToWrite, unsigned char * pucData);


#ifdef _DEBUG
#define PRINT(x)    OutputDebugString(x)
#else
#define PRINT(x)
#endif

#ifdef __cplusplus 
} 
#endif

Answer 1

您提供的错误消息是：

USB4_FIFOBufferRector extern int _stidcall USB4_ReadFIFOBufferStrut(short iDeviceNo, long *plSize, USB$_FIFOBufferRecord *pCBR, unsigned long ulReadTimeout);

我相信这一行有多个拼写错误。这可能是草率的打字，或者它可能是你的错误的来源：

USB4_FIFOBufferRector（USB4_FIFOBufferRecord ??）
_stidcall（_stdcall ??）
USB $ _FIFOBufferRecord（USB4_FIFOBufferRecord ??）
USB4_ReadFIFOBufferStrut（USB4_ReadFIFOBufferStruct ??）

Answer 2

供应商的头文件第一次出现一些小错误，......

错误消息：

* ... \ USB4.h：222：79：错误：未知类型名称'USB4_FIFOBufferRector'extern int _stidcall USB4_ReadFIFOBufferStrut（短iDeviceNo，long * plSize，USB $ _FIFOBufferRecord pCBR，unsigned long ulReadTimeout ）;

第222行第79列出现在结构USB4_FIFOBufferRecord的引用上，该结构在同一文件的第149行定义：

struct USB4_FIFOBufferRecord
{
    unsigned char Header[6];
    unsigned char Input;
    unsigned char EStop;
    unsigned long Time;
    unsigned long Count[4];
    unsigned char Status[4];
    unsigned short ADC[4];
};

问题已定义此结构，但stuct关键字未包含在第222行的原型中。

要解决此问题 ，请参阅以下行：

extern int _stdcall USB4_ReadFIFOBufferStruct(short iDeviceNo, long *plSize, USB4_FIFOBufferRecord *pCBR, unsigned long ulReadTimeout);

尝试在struct前面插入关键字词USB4_FIFOBufferRecord。像这样：

extern int _stdcall USB4_ReadFIFOBufferStruct(short iDeviceNo, long *plSize, struct USB4_FIFOBufferRecord *pCBR, unsigned long ulReadTimeout);

或

在第149行，修改结构定义。试试这个：

typedef struct
    {
        unsigned char Header[6];
        unsigned char Input;
        unsigned char EStop;
        unsigned long Time;
        unsigned long Count[4];
        unsigned char Status[4];
        unsigned short ADC[4];
    } USB4_FIFOBufferRecord;

这将导致USB4_FIFOBufferRecord成为“struct USB4_FIFOBufferRecord”类型的新变量。有了它，您可以按原样保留原型。

可以使用 ，（您的选择。）

Answer 3

USB4_FIFOBufferRecord在第149行声明为struct USB4_FIFOBufferRecord{...};。在C中，如果参数类型是结构，则该参数在类型声明之前必须具有struct关键字。因此，在第222行，您需要将USB4_FIFOBufferRecord *pCBR声明为struct USB4_FIFOBufferRecord *pCBR。

所以，这条线必须是

extern int _stdcall USB4_ReadFIFOBufferStruct(short iDeviceNo, long *plSize, struct USB4_FIFOBufferRecord *pCBR, unsigned long ulReadTimeout);

C程序中头文件未知类型名称的问题

3 个答案: