| //+------------------------------------------------------------------+
|
| //| FileBMP.mqh |
|
| //| Copyright 2000-2025, MetaQuotes Ltd. |
|
| //| https://www.mql5.com |
|
| //+------------------------------------------------------------------+
|
| #include <Object.mqh>
|
|
|
| //+------------------------------------------------------------------+
|
| //| Bitmap headers |
|
| //+------------------------------------------------------------------+
|
| struct BITMAPFILEHEADER
|
| {
|
| ushort bfType;
|
| uint bfSize;
|
| ushort bfReserved1;
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| ushort bfReserved2;
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| uint bfOffBits;
|
| };
|
| struct BITMAPINFOHEADER
|
| {
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| uint biSize;
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| int biWidth;
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| int biHeight;
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| ushort biPlanes;
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| ushort biBitCount;
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| uint biCompression;
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| uint biSizeImage;
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| int biXPelsPerMeter;
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| int biYPelsPerMeter;
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| uint biClrUsed;
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| uint biClrImportant;
|
| };
|
| #define BM 0x4D42
|
| //+------------------------------------------------------------------+
|
| //| Class CFileBMP |
|
| //| Purpose: Special class to read and write bmp file |
|
| //| Derives from class CObject. |
|
| //+------------------------------------------------------------------+
|
| class CFileBMP : public CObject
|
| {
|
| protected:
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| int m_handle;
|
| BITMAPFILEHEADER m_file_header;
|
| BITMAPINFOHEADER m_info_header;
|
|
|
| public:
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| CFileBMP(void);
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| ~CFileBMP(void);
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| int OpenWrite(const string file_name,bool common_flag=false);
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| int OpenRead(const string file_name,bool common_flag=false);
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| int Write32BitsArray(uint& uint_array[],const int width,const int height);
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| int Read32BitsArray(uint& uint_array[],int& width,int& height);
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| void Close(void);
|
| };
|
| //+------------------------------------------------------------------+
|
| //| Constructor |
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| //+------------------------------------------------------------------+
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| CFileBMP::CFileBMP(void) : m_handle(INVALID_HANDLE)
|
| {
|
| ZeroMemory(m_file_header);
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| ZeroMemory(m_info_header);
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| }
|
| //+------------------------------------------------------------------+
|
| //| Destructor |
|
| //+------------------------------------------------------------------+
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| CFileBMP::~CFileBMP(void)
|
| {
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| Close();
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Open the file |
|
| //+------------------------------------------------------------------+
|
| int CFileBMP::OpenWrite(const string file_name,bool common_flag)
|
| {
|
| Close();
|
| //--- action
|
| int open_flags=FILE_BIN|FILE_WRITE|FILE_SHARE_READ|FILE_SHARE_WRITE;
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| if(common_flag)
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| open_flags|=FILE_COMMON;
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| //--- open
|
| m_handle=FileOpen(file_name,open_flags);
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| //--- result
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| return(m_handle);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Open the file |
|
| //+------------------------------------------------------------------+
|
| int CFileBMP::OpenRead(const string file_name,bool common_flag)
|
| {
|
| Close();
|
| //--- action
|
| int open_flags=FILE_BIN|FILE_READ|FILE_SHARE_READ|FILE_SHARE_WRITE;
|
| if(common_flag)
|
| open_flags|=FILE_COMMON;
|
| //--- open
|
| m_handle=FileOpen(file_name,open_flags);
|
| //--- check bmp headers
|
| if(m_handle!=INVALID_HANDLE)
|
| {
|
| uint fileheader_size=FileReadStruct(m_handle,m_file_header);
|
| uint infoheader_size=FileReadStruct(m_handle,m_info_header);
|
| //--- it should be a simple 32-bit bmp
|
| if(fileheader_size!=sizeof(m_file_header) ||
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| infoheader_size!=sizeof(m_info_header) ||
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| m_file_header.bfType!=BM ||
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| m_file_header.bfOffBits!=sizeof(m_file_header)+sizeof(m_info_header) ||
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| m_info_header.biBitCount!=32 ||
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| m_info_header.biClrUsed!=0)
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| Close();
|
| }
|
| //--- result
|
| return(m_handle);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Write the file |
|
| //+------------------------------------------------------------------+
|
| int CFileBMP::Write32BitsArray(uint& uint_array[],const int width,const int height)
|
| {
|
| if(m_handle==INVALID_HANDLE)
|
| return(-1);
|
| //--- check size
|
| int size=width*height;
|
| if(size==0)
|
| return(0);
|
| if(size<0)
|
| size=-size;
|
| if(ArraySize(uint_array)<size)
|
| return(-2);
|
| //--- prepare headers
|
| ZeroMemory(m_file_header);
|
| ZeroMemory(m_info_header);
|
| m_file_header.bfType=BM;
|
| m_file_header.bfSize=sizeof(m_file_header)+sizeof(m_info_header)+size*sizeof(uint);
|
| m_file_header.bfOffBits=sizeof(m_file_header)+sizeof(m_info_header);
|
| m_info_header.biSize=sizeof(m_info_header);
|
| m_info_header.biWidth=width;
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| m_info_header.biHeight=height;
|
| m_info_header.biPlanes=1;
|
| m_info_header.biBitCount=32;
|
| m_info_header.biSizeImage=size*32;
|
| //--- write bmp-file
|
| FileSeek(m_handle,0,SEEK_SET);
|
| FileWriteStruct(m_handle,m_file_header);
|
| FileWriteStruct(m_handle,m_info_header);
|
| uint written=FileWriteArray(m_handle,uint_array,0,size);
|
| //--- bytes written
|
| return((int)written*sizeof(uint));
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read the file |
|
| //+------------------------------------------------------------------+
|
| int CFileBMP::Read32BitsArray(uint& uint_array[],int& width,int& height)
|
| {
|
| if(m_handle==INVALID_HANDLE)
|
| return(-1);
|
| //--- store dimensions from header
|
| width=m_info_header.biWidth;
|
| height=m_info_header.biHeight;
|
| //--- check size
|
| int size=width*height;
|
| if(size==0)
|
| return(0);
|
| if(size<0)
|
| size=-size;
|
| //--- read bmp-file
|
| FileSeek(m_handle,sizeof(m_file_header)+sizeof(m_info_header),SEEK_SET);
|
| uint read=FileReadArray(m_handle,uint_array,0,size);
|
| //--- bytes read
|
| return((int)read*sizeof(uint));
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Close the file |
|
| //+------------------------------------------------------------------+
|
| void CFileBMP::Close(void)
|
| {
|
| //--- check handle
|
| if(m_handle!=INVALID_HANDLE)
|
| {
|
| FileClose(m_handle);
|
| m_handle=INVALID_HANDLE;
|
| }
|
| }
|
| //+------------------------------------------------------------------+
|
