pragma region Windows窗体设计器生成的代码

Question

在C ++中，我有一个char [256]变量，该变量由对外部DLL的调用填充，外部DLL用数据填充它。从那里我想将char []添加为ComboBox项目。

char name[256];
name[0] = "76";
comboBox1->Items->Add(name);

这会产生构建错误，因为char []不是System :: Object的类型。有关将char []转换为可以作为项添加到ComboBox控件的内容的任何想法？转换为字符串会很好，但我不确定如何做到这一点。另外，如果我尝试创建一个变量，例如：

string strName;

还会因缺少';'而产生错误在标识符'strName'之前。我是C ++的初学者，我仍然把我的大脑包裹起来，所以感谢你提供的任何帮助！

修改完整代码请求：

#pragma once

命名空间FMODMultipleSoundcardWindowed {

#include <string>
#include "inc/fmod.h"
#include "inc/fmod_errors.h"

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace std;


FMOD_SYSTEM     *systemA, *systemB;
FMOD_SOUND      *soundA, *soundB;
FMOD_CHANNEL    *channelA = 0, *channelB = 0;
FMOD_DSP        *dspNormalizerA, *dspNormalizerB;
FMOD_DSP        *dspCompressorA, *dspCompressorB;
FMOD_DSP        *dspEqualizerA[10], *dspEqualizerB[10];
FMOD_DSP        *dspVSTVUA, *dspVSTVUB;
FMOD_RESULT     result;
unsigned int    dspVSTVUHandleA, dspVSTVUHandleB;
unsigned int    version;
int             numdrivers, count;


public ref class Form1 : public System::Windows::Forms::Form
{
public:
    Form1(void)
    {
        InitializeComponent();

        result = FMOD_System_Create(&systemA);
        ERRCHECK(result);

        result = FMOD_System_GetVersion(systemA, &version);
        ERRCHECK(result);

        if (version < FMOD_VERSION)
        {
            MessageBox::Show("You are using an old version of FMOD!");
        }

        result = FMOD_System_GetNumDrivers(systemA, &numdrivers);
        ERRCHECK(result);

        for (count = 0; count < numdrivers; count++)
        {
            char name[256];

            result = FMOD_System_GetDriverInfo(systemA, count, name, 256, 0);
            ERRCHECK(result);

            m_objPrimaryAudioDeviceComboBox->Items->Add(name[0]);
        }
    }

    void ERRCHECK(FMOD_RESULT result)
    {
        if (result != FMOD_OK)
        {
            MessageBox::Show("FMOD Error!");
            this->Close();
        }
    }

protected:
    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    ~Form1()
    {
        if (components)
        {
            delete components;
        }
    }
private: System::Windows::Forms::ComboBox^  m_objPrimaryAudioDeviceComboBox;
protected: 
private: System::Windows::Forms::ComboBox^  m_objSecondaryAudioDeviceComboBox;

private:
    System::ComponentModel::Container ^components;

pragma region Windows窗体设计器生成的代码

    void InitializeComponent(void)
    {
        this->m_objPrimaryAudioDeviceComboBox = (gcnew System::Windows::Forms::ComboBox());
        this->m_objSecondaryAudioDeviceComboBox = (gcnew System::Windows::Forms::ComboBox());
        this->SuspendLayout();
        // 
        // m_objPrimaryAudioDeviceComboBox
        // 
        this->m_objPrimaryAudioDeviceComboBox->FormattingEnabled = true;
        this->m_objPrimaryAudioDeviceComboBox->Location = System::Drawing::Point(12, 12);
        this->m_objPrimaryAudioDeviceComboBox->Name = L"m_objPrimaryAudioDeviceComboBox";
        this->m_objPrimaryAudioDeviceComboBox->Size = System::Drawing::Size(254, 21);
        this->m_objPrimaryAudioDeviceComboBox->TabIndex = 0;
        // 
        // m_objSecondaryAudioDeviceComboBox
        // 
        this->m_objSecondaryAudioDeviceComboBox->FormattingEnabled = true;
        this->m_objSecondaryAudioDeviceComboBox->Location = System::Drawing::Point(12, 54);
        this->m_objSecondaryAudioDeviceComboBox->Name = L"m_objSecondaryAudioDeviceComboBox";
        this->m_objSecondaryAudioDeviceComboBox->Size = System::Drawing::Size(254, 21);
        this->m_objSecondaryAudioDeviceComboBox->TabIndex = 1;
        // 
        // Form1
        // 
        this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
        this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
        this->ClientSize = System::Drawing::Size(440, 426);
        this->Controls->Add(this->m_objSecondaryAudioDeviceComboBox);
        this->Controls->Add(this->m_objPrimaryAudioDeviceComboBox);
        this->Name = L"Form1";
        this->Text = L"FMOD Multiple Soundcard with VST";
        this->ResumeLayout(false);

    }

pragma endregion

};

}

Answer 1

string strName;

首先，您需要#include <string>才能使用std::string。其次，您需要将using namespace std;添加到您的单元，才能将std::string称为string。或者，使用普通std::string strName代替。这是一个品味问题。使用完全限定的表单可以避免使用std中的所有标识符来污染您的命名空间。

主要问题：

gcnew String( text.c_str() );

这应该进行转换。 text是您的std::string实例，表达式的结果是您需要传递给Add的字符串对象。

Answer 2

尝试string strName(name);（假设您的包含和命名空间正确...）

更新：看起来你需要使用System::String，而不是STL字符串。

Answer 3

你的第二个问题听起来就像缺少字符串类的include，所以只需将#include <string>添加到文件的顶部，你可能还需要添加using namespace std;或使用'std :: string '取决于你的系统

将char []转换为System :: Object

pragma region Windows窗体设计器生成的代码

pragma endregion

3 个答案: