Question

您好我试图创建一个表单，允许用户单击图片框将图片导入图片框以及其他功能。问题在于导入，我的一个团队成员完成了导入代码，但我们无法使用混合托管和非托管代码。我们都不知道有关托管代码或无人代码进入此项目的任何内容，因此我们不知道如何使以下工作。

下面我们有两种方法，一种是将WChar转换为String，另一种是打开浏览器框来选择图像。后者使用一个图片类，它包含几个变量，如路径和名称。图片类适用于其他功能，无法进行分支。 GetLogo（）的类似版本在不在visual studio（unmamanged）时可以正常工作。

#pragma unmanaged
#include <windows.h>
#include <iostream>
#include <fstream>
#include <string>
#include <list>
#include <iomanip>
using namespace std;

#pragma managed
#include "Picture.h"
#include <list>
#using<system.dll>
using namespace System;
using namespace System::IO;
using namespace System::Collections::Generic;

static string importFiles = "Import Pictures";
static wstring importLogo = L"Import Logo";


System::String^ convertWCharToString(wchar_t buffer[])
{
    // Convert the wchar_t string to a char* string. Record 
    //.the length of the original string and add 1 to it to
    //.account for the terminating null character.
    size_t origsize = wcslen(buffer) + 1;
    size_t convertedChars = 0;

    // Allocate two bytes in the multibyte output string for every wide
    // character in the input string (including a wide character
    // null). Because a multibyte character can be one or two bytes,
    // you should allot two bytes for each character. Having extra
    // space for the new string is not an error, but having
    // insufficient space is a potential security problem.
    const size_t newsize = origsize*2;
    // The new string will contain a converted copy of the original
    // string plus the type of string appended to it.
    char *nstring = new char[newsize];

    // Put a copy of the converted string into nstring
    wcstombs_s(&convertedChars, nstring, newsize, buffer, _TRUNCATE);


    String^ strBuf = gcnew System::String(nstring) ;

    return strBuf;
}


Picture^ GetLogo()
{
    const int BUFSIZE = 1024;
    wchar_t buffer[BUFSIZE] = {0};

    //Define attributes of the OPEN FILE NAME
    OPENFILENAME ofns = {0};
    ofns.lStructSize = sizeof( ofns );
    ofns.lpstrFile = buffer;
    ofns.nMaxFile = BUFSIZE;
    ofns.lpstrTitle = importLogo.c_str();
    ofns.Flags = OFN_EXPLORER |
                 OFN_ENABLESIZING;
    GetOpenFileName( & ofns );

    wchar_t szFiles[1024], szFileTok[260];
    wchar_t szDir[1024];

    Picture^ file;

    wchar_t *p;
    lstrcpy(szFiles, buffer);
    lstrcpy(szDir, buffer);

    p = buffer;

    p += lstrlen(p) + 1;

    convertWCharToString(buffer);

    String^ strBuf = gcnew System::String(buffer) ;
    String^ strDir = gcnew System::String(szDir) ;      

    file = gcnew Picture(strBuf, strDir, false);

    return file;
}

Picture.h

#pragma once
//This is used to hold the name of the picture, the path to it, and if it is picked in the viewer
#include <string>

ref class Picture
{   
public:
    Picture(){};  //default constructor

    Picture(System::String^ newName, System::String^ newPath, bool newPicked)
    {
        strName = newName;
        strPath = newPath;
        boolPicked = newPicked;
    }

    void setName(System::String^ newName)
    {
        strName = newName;
    }

    void setPath(System::String^ newPath)
    {
        strPath = newPath;
    }


    void setPicked(bool newPicked)
    {
        boolPicked = newPicked;
    }

    System::String^ getName()
    {
        return strName;
    }
    System::String^ getPath()
    {
        return strPath;
    }
    bool getPicked()
    {
        return boolPicked;
    }   

private:
    System::String^ strName;
    System::String^ strPath;
    bool boolPicked;
};

#pragma endregion

以下是调用getLogo

的函数示例

private: System::Void pictureBox1_Click(System::Object^  sender, System::EventArgs^  e) {
             Picture^ newLogo = GetLogo();
             logoPictureBox->Image = dynamic_cast<Bitmap^> (Image::FromFile(newLogo->getPath(), true));          
         }

以下是当前错误：

error LNK2028: unresolved token (0A000531) "extern "C" int __stdcall GetOpenFileNameW(struct tagOFNW *)" (?GetOpenFileNameW@@$$J14YGHPAUtagOFNW@@@Z) referenced in function "class Picture ^ __clrcall GetLogo(void)" (?GetLogo@@$$FYMP$AAVPicture@@XZ)

如果您需要更多代码，请告诉我们。谢谢你的时间。

将托管类/类型与非托管LNK2028混合：未解析的标记

0 个答案: