將char []轉換爲System :: Object

Question

在C++中，我有一個char [256]變量，通過調用一個外部DLL來填充數據。從那裏我想添加char []作爲ComboBox項目。

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

由於char []不是System :: Object的類型，所以會產生構建錯誤。任何關於將char []轉換爲我可以將其作爲Item添加到ComboBox控件的想法？轉換爲字符串會很好，但我不確定如何做到這一點。此外，如果我嘗試創建一個變量，例如：

string strName; 

也會爲缺少的';'創建一個錯誤。在標識符'strName'之前。我是C++的初學者，並且仍然讓我的大腦纏繞它，所以感謝您提供的任何幫助！

編輯 所要求的完整代碼：

#pragma once 

命名空間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; 

編譯區域Windows窗體設計器生成的代碼

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); 

    } 

編譯連接DREGION

}; 

}

Answer 1

string strName; 

首先，你需要#include <string>才能使用std::string。其次，您需要將using namespace std;添加到您的設備中，以便將std::string設爲string。或者，也可以使用簡單的std::string strName。這是一個品味問題。使用完全限定的格式可避免使用來自std的所有標識符污染您的名稱空間。

與主要問題：

gcnew String(text.c_str()); 

這應該做的轉換。 text是您的std::string實例，表達式的結果是您需要傳遞給Add的字符串對象。

Answer 2

嘗試string strName(name);（你有你的包括和命名空間權的假設......）

更新：它看起來像您需要使用System::String，而不是STL字符串。

Answer 3

你的第二個問題聽起來好像你錯過了包括String類，所以只需添加#include <string>到文件的頂部，你可能還需要添加using namespace std;，或者根據您的系統上使用「的std :: string」