Win32 call system color dialog box, win32 call dialog box

Win32 call system color dialog box, win32 call dialog box

Reference: http://blog.csdn.net/u013242177/article/details/50437358

• First, you must include the commdlg. h header file. This is the header file of the general dialog box, including the file dialog box, color dialog box, and Print dialog box.
• Then declare a CHOOSECOLOR variable and a COLORREF variable rgbLineColor to store the selected color.

static CHOOSECOLOR stChooseColor; static COLORREF rgbLineColor;

Here, CHOOSECOLOR is a struct, including information about the color dialog box initialized using the ChooseColor function. You can find the struct in MSDN as follows:
Typedef struct {
DWORD lStructSize;
HWND hwndOwner;
HWND hInstance;
COLORREF rgbResult;
COLORREF * lpCustColors;
DWORD Flags;
LPARAM lCustData;
LPCCHOOKPROC lpfnHook;
LPCTSTR lpTemplateName;
} CHOOSECOLOR;

• Then assign a value to the content of stChooseColor.

stChooseColor.lStructSize    = sizeof(CHOOSECOLOR) ;stChooseColor.hwndOwner      = hWnd ;stChooseColor.rgbResult      = rgbLineColor ;stChooseColor.lpCustColors   = (LPDWORD) dwCustColors ;stChooseColor.Flags          = CC_RGBINIT ;stChooseColor.lCustData      = 0 ;stChooseColor.lpfnHook       = NULL ;stChooseColor.lpTemplateName = NULL ;

• Finally, use the ChooseColor function to create a color dialog box for the user to choose a color.

if (ChooseColor(&stChooseColor)){ rgbLineColor = stChooseColor.rgbResult; }

Obtain the RGB component value in COLORREF:

COLORREF colorrrefRGB =RGB(120,250,110);BYTE r = GetRValue(colorrrefRGB);BYTE g = GetGValue(colorrrefRGB);BYTE b = GetBValue(colorrrefRGB);

Sample Code:

#include "commdlg.h"......................................void CmyDialogt::OnBnClickedButtonPickcolor(){    // TODO: Add your control notification handler code here    static CHOOSECOLOR stChooseColor;     static COLORREF rgbLineColor;     static COLORREF dwCustColors[16];    stChooseColor.lStructSize    = sizeof(CHOOSECOLOR) ;    stChooseColor.hwndOwner      = this->m_hWnd ;    stChooseColor.rgbResult      = rgbLineColor ;    stChooseColor.lpCustColors   = (LPDWORD) dwCustColors ;    stChooseColor.Flags          = CC_RGBINIT ;    stChooseColor.lCustData      = 0 ;    stChooseColor.lpfnHook       = NULL ;    stChooseColor.lpTemplateName = NULL ;    if (ChooseColor(&stChooseColor))    {        rgbLineColor = stChooseColor.rgbResult;        BYTE r = GetRValue(rgbLineColor);        BYTE g = GetGValue(rgbLineColor);        BYTE b = GetBValue(rgbLineColor);    }}

Running result: