C++ Builder6 编写的程序，实现打印多张图片。运行不稳定，帮忙啊！
本人用C++ Builder6 编写的程序，实现点击按键，一次把四个Image上的图片打印到指定的位置。可是点击第一次，四张图片准确的打印到指定的位置，第二次就不行了，只能打印其中三张或两张，第三次打印也是不行~~~~~~~~~~~奇怪啊！代码如下，还请高手赐教啊！
//---------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h "
//---------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm "
TForm1 *Form1;
//---------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------


void __fastcall TForm1::BitBtn1Click(TObject *Sender)
{
unsigned int BitmapInfoSize, BitmapImageSize;
long DIBWidth, DIBHeight;
PChar BitmapImage;
Windows::PBitmapInfo BitmapInfo;
int width,height;
int x_pos,y_pos;
width=200;
height=200;
x_pos=10;
y_pos=10;
Graphics::TBitmap *bitmap1=new Graphics::TBitmap();

bitmap1-> PixelFormat=pf24bit;
bitmap1-> Assign(invisible1-> Picture-> Graphic);
Printer()-> BeginDoc();

GetDIBSizes(bitmap1-> Handle, BitmapInfoSize, BitmapImageSize);
BitmapInfo = (PBitmapInfo) new char[BitmapInfoSize];
BitmapImage = (PChar) new char [BitmapImageSize];
GetDIB(bitmap1-> Handle, 0, BitmapInfo, BitmapImage);
DIBWidth = BitmapInfo-> bmiHeader.biWidth;
DIBHeight = BitmapInfo-> bmiHeader.biHeight;

StretchDIBits(Printer()-> Canvas-> Handle,
x_pos, y_pos,width, height,
0, 0, DIBWidth, DIBHeight,
BitmapImage, BitmapInfo,
DIB_RGB_COLORS, SRCCOPY);

x_pos=210;
y_pos=210;


bitmap1-> Assign(invisible2-> Picture-> Graphic);


GetDIBSizes(bitmap1-> Handle, BitmapInfoSize, BitmapImageSize);
BitmapInfo = (PBitmapInfo) new char[BitmapInfoSize];

BitmapImage = (PChar) new char [BitmapImageSize];
GetDIB(bitmap1-> Handle, 0, BitmapInfo, BitmapImage);
DIBWidth = BitmapInfo-> bmiHeader.biWidth;
DIBHeight = BitmapInfo-> bmiHeader.biHeight;

StretchDIBits(Printer()-> Canvas-> Handle,
x_pos, y_pos,width, height,
0, 0, DIBWidth, DIBHeight,
BitmapImage, BitmapInfo,
DIB_RGB_COLORS, SRCCOPY);

x_pos=410;
y_pos=410;


bitmap1-> Assign(invisible3-> Picture-> Graphic);


GetDIBSizes(bitmap1-> Handle, BitmapInfoSize, BitmapImageSize);
BitmapInfo = (PBitmapInfo) new char[BitmapInfoSize];
BitmapImage = (PChar) new char [BitmapImageSize];
GetDIB(bitmap1-> Handle, 0, BitmapInfo, BitmapImage);
DIBWidth = BitmapInfo-> bmiHeader.biWidth;
DIBHeight = BitmapInfo-> bmiHeader.biHeight;

StretchDIBits(Printer()-> Canvas-> Handle,
x_pos, y_pos,width, height,
0, 0, DIBWidth, DIBHeight,
BitmapImage, BitmapInfo,
DIB_RGB_COLORS, SRCCOPY);

x_pos=610;
y_pos=610;
bitmap1-> Assign(invisible4-> Picture-> Graphic);


GetDIBSizes(bitmap1-> Handle, BitmapInfoSize, BitmapImageSize);
BitmapInfo = (PBitmapInfo) new char[BitmapInfoSize];
BitmapImage = (PChar) new char [BitmapImageSize];
GetDIB(bitmap1-> Handle, 0, BitmapInfo, BitmapImage);
DIBWidth = BitmapInfo-> bmiHeader.biWidth;
DIBHeight = BitmapInfo-> bmiHeader.biHeight;

StretchDIBits(Printer()-> Canvas-> Handle,

x_pos, y_pos,width, height,
0, 0, DIBWidth, DIBHeight,
BitmapImage, BitmapInfo,
DIB_RGB_COLORS, SRCCOPY);

delete BitmapInfo;
delete BitmapImage;
Printer()-> EndDoc();

delete bitmap1;

}
//---------------------------------------



[解决办法]
这个
一点建议:
你的函数很多重复的代码
完全可以将打印某一张到指定位置的函数
封装成一个单独的函数

这样结构更加清晰
阅读会方便一些!

至于代码中的问题
暂时没有看出来
抱歉
[解决办法]
打印的Task还没完吧。。。打印速度不是由你按键速度决定的。。。