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為什么Freetype無法在我的.exe中加載字體

[英]Why isn't Freetype loading a font in my .exe

我編寫了一個使用FreeType將文本呈現到窗口上的應用程序。 我已經構建了調試和發布版本,都可以從Visual Studio 2015正常運行。我已經設置了運行時庫來鏈接到/ MDd。 我還將字體OCRAEXT.TTF包含在資源文件中。

這是使用FreeType的代碼:

TextRenderer::TextRenderer(GLuint width, GLuint height)
{
    //Load and configure shader
    this->TextShader = ResourceManager::LoadShader("VertexText.vert", "FragmentText.frag", nullptr, "text");
    this->TextShader.SetMatrix4("projection", glm::ortho(0.0f, static_cast<GLfloat>(width), static_cast<GLfloat>(height), 0.0f), GL_TRUE);
    this->TextShader.SetInteger("text", 0);

    //configure VAO/VBO for texture quads
    glGenVertexArrays(1, &this->VAO);
    glGenBuffers(1, &this->VBO);
    glBindVertexArray(this->VAO);
    glBindBuffer(GL_ARRAY_BUFFER, this->VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 6 * 4, NULL, GL_DYNAMIC_DRAW);
    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), 0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glBindVertexArray(0);
}


void TextRenderer::Load(std::string font, GLuint fontSize)
{
    //first clear the previously loaded characters
    this->Characters.clear();

    //then initialise and load the Freetype library
    FT_Library ft;
    if (FT_Init_FreeType(&ft))  //All functions return a value different than 0 whenever an error occurred
        std::cout << "ERROR::FREETYPE: Could not init freetype library" << std::endl;

    //Load font as face
    FT_Face face;
    if (FT_New_Face(ft, font.c_str(), 0, &face))
        std::cout << "ERROR::FREETYPE: Failed to load font" << std::endl;

    //set size to load glyphs as
    FT_Set_Pixel_Sizes(face, 0, fontSize);

    //disable byte-alignment restriction
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    //then for the first 128 ASCII characters, pre-load/compile their characters and store them
    for (GLubyte c = 0; c < 128; c++)
    {
        //Load character glyph
        if (FT_Load_Char(face, c, FT_LOAD_RENDER))
        {
            std::cout << "ERROR::FREETYPE: Failed to load glyph" << std::endl;
            continue;
        }

        //generate texture
        GLuint texture;
        glGenTextures(1, &texture);
        glBindTexture(GL_TEXTURE_2D, texture);
        glTexImage2D(
            GL_TEXTURE_2D,
            0,
            GL_RED,
            face->glyph->bitmap.width,
            face->glyph->bitmap.rows,
            0,
            GL_RED,
            GL_UNSIGNED_BYTE,
            face->glyph->bitmap.buffer
            );

        //set texture options
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

        //Now store character for later use
        Character character =
        {
            texture,
            glm::ivec2(face->glyph->bitmap.width, face->glyph->bitmap.rows),
            glm::ivec2(face->glyph->bitmap_left, face->glyph->bitmap_top),
            face->glyph->advance.x,
        };
        Characters.insert(std::pair<GLchar, Character>(c, character));

    }
    glBindTexture(GL_TEXTURE_2D, 0);

    //destroy FreeType once we're finished
    FT_Done_Face(face);
    FT_Done_FreeType(ft);
}

在我的Game類中,我具有一個初始化函數,其中包含以下代碼行:

Text = new TextRenderer(this->Width, this->Height);
    Text->Load("fonts/OCRAEXT.TTF", 24);

問題是當我嘗試運行獨立的.exe時,出現消息“ ERROR :: FREETYPE:無法加載字體”和.exe。 停止運行。 我嘗試調試此問題,但收到一條消息,內容為“ Game.exe中0x00730072的未處理異常。0xC0000005:執行位置0x00730072的訪問沖突。”

斷點指向以下代碼行:

FT_Set_Pixel_Sizes(face, 0, fontSize);

我試圖逐步檢查代碼以找出問題所在,但沒有什么意義。 有人可以解釋可能是什么問題嗎?

FT_New_Face需要文件系統中的路徑。 PE資源不在文件系統中,因此嘗試查找文件失敗,並且出現此錯誤。

您必須改用FT_New_Memory_Face 可以使用Resource API(鏈接到MSDN)檢索資源的內存位置。 代替使用LoadLibrary使用GetModuleHandle(NULL)來檢索進程的PE映像的句柄。

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