How to add system date and time to image in C?

[milky]

hi guys,

I'm have no idea how to add the system date and time to image in C code. Does anyone can help me on this?

[CBasicNet]

You can use GDI+. Before you use GDI+, you need to initialize it.


#include <Gdiplus.h>


Gdiplus::GdiplusStartupInput m_gdiplusStartupInput;
ULONG_PTR m_gdiplusToken;
Gdiplus::GdiplusStartup(&m_gdiplusToken, &m_gdiplusStartupInput, NULL);


Here is a function to do what you wants and saves the file

using namespace Gdiplus;
bool DateStampImage(
Image &SrcBmp,
const std::wstring& szDestFile,
const std::wstring& szEncoderString )
{
Image* pDestBmp = SrcBmp.Clone();

if( !pDestBmp )
return false;

Graphics graphics(pDestBmp);

time_t ltime;
memset(&ltime, 0, sizeof(ltime));
time( &ltime );
std::wstring szDateTime = _wctime( &ltime );

Font myFont(L"Arial", 16, FontStyleBold);
PointF origin(1.0f, 1.0f);
SolidBrush blackBrush(Color(255, 0, 0, 0));

// Draw string.
graphics.DrawString( szDateTime.c_str(), szDateTime.length(),&myFont,origin,&blackBrush);

CLSID Clsid;
int result = GetEncoderClsid(szEncoderString.c_str(), &Clsid);

if( result < 0 )
return false;

Status status = pDestBmp->Save( szDestFile.c_str(), &Clsid );

delete pDestBmp;
pDestBmp = NULL;

return status == Ok;
}

int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
UINT num = 0; // number of image encoders
UINT size = 0; // size of the image encoder array in bytes

ImageCodecInfo* pImageCodecInfo = NULL;

GetImageEncodersSize(&num, &size);
if(size == 0)
return -1; // Failure

pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
if(pImageCodecInfo == NULL)
return -1; // Failure

GetImageEncoders(num, size, pImageCodecInfo);

for(UINT j = 0; j < num; ++j)
{
if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )
{
*pClsid = pImageCodecInfo[j].Clsid;
free(pImageCodecInfo);
return j; // Success
}
}

free(pImageCodecInfo);
return -1; // Failure
}


Here is how you would typically call the function

using namespace Gdiplus;

Image SrcBmp(L"E:\\Media\\LYF\\lyf_1.jpg", TRUE);

bool bRet = DateStampImage(
SrcBmp,
L"E:\\Media\\LYF\\lyf_1_2.jpg",
L"image/jpeg" );

if( bRet )
MessageBoxW(NULL, L"Successful", L"Title", MB_OK );
else
MessageBoxW(NULL, L"Failed", L"Title", MB_OK );


Lastly, you need to shut down GDI+, after using.


Gdiplus::GdiplusShutdown(m_gdiplusToken);

[milky]

hi CBasicNet,

thanks for the reply and the code. A doubt to ask. Does the code works in Linux? And the programming language u used is it a C# or C language?

[Lindley]

GDI is a Windows thing. Won't work in Linux, probably.

There are packages out there for drawing text using OpenGL, but it's not as easy as you'd think it would be.