德爾福：如何添加文字到圖像並保存新圖像？

Question

這個想法是從數據庫（文本和圖片）檢索日期，然後將這些數據添加到另一張圖片（如身份證表格），然後保存新圖片。

這怎麼能在delphi中完成？

THX

Answer 1

嘗試以下操作：

uses 
    PNGImage; 

procedure TForm1.Button1Click(Sender: TObject); 
var 
    PNGImage: TPNGImage; 
    BlobStream: TMemoryStream; 
begin 
    // create the PNG image instance 
    PNGImage := TPNGImage.Create; 
    try 
    // assuming you have in the BlobStream variable the image from a DB loaded 
    PNGImage.LoadFromStream(BlobStream); 
    // setup the text background to be transparent 
    PNGImage.Canvas.Brush.Style := bsClear; 
    // optionally configure the font 
    PNGImage.Canvas.Font.Size := 11; 
    PNGImage.Canvas.Font.Color := clRed; 
    PNGImage.Canvas.Font.Style := [fsBold]; 
    // and render it to the image's canvas 
    PNGImage.Canvas.TextOut(5, 5, 'SomeText'); 
    // save this modified image to the file 
    PNGImage.SaveToFile('c:\picture.png'); 
    finally 
    // and finally free the PNG image instance 
    PNGImage.Free; 
    end; 
end; 

下面是一個例子，如何我會創造我的訪問卡（不要忘記將necessary image文件保存爲d:\llamas.png）：

uses 
    GraphUtil, PNGImage; 

procedure CreateCard(const AFileFile: string; AImage: TPNGImage; 
    const AName, ASurname: string); 
begin 
    with TPNGImage.CreateBlank(COLOR_RGB, 8, 330, 160) do 
    try 
    GradientFillCanvas(Canvas, clWhite, $000080FF, 
     Canvas.ClipRect, gdVertical); 
    Canvas.StretchDraw(Rect(18, 18, 108, 108), AImage); 
    Canvas.Pen.Width := 2; 
    Canvas.Brush.Style := bsClear; 
    Canvas.Rectangle(5, 5, Width - 4, Height - 4); 
    Canvas.Font.Size := 12; 
    Canvas.Font.Style := [fsBold]; 
    Canvas.TextOut(110, 30, 'Form: ' + AName + ' :.'); 
    Canvas.TextOut(125, 60, 'Genus: ' + ASurname + ' :.'); 
    SaveToFile(AFileFile); 
    finally 
    Free; 
    end; 
end; 

procedure TForm1.Button1Click(Sender: TObject); 
var 
    PNGImage: TPNGImage; 
begin 
    PNGImage := TPNGImage.Create; 
    try 
    // here you will load the image blob (by using LoadFromStream) 
    // instead of LoadFromFile 
    PNGImage.LoadFromFile('d:\llamas.png'); 
    CreateCard('d:\visit-card.png', PNGImage, 'Alpaca', 'Lama'); 
    finally 
    PNGImage.Free; 
    end; 
end; 

下面是它的外觀：