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    在作業系統上，檔案選擇、色彩選擇、和字型選擇這些功能一般都是作業系統提供的。記得以前在寫mfc的時候，由於基本功能都是mfc封裝好的，每次呼叫的時候都覺得非常得神奇，等到後來有機會用win32 api寫的時候，才發現編寫這些功能遠比我們想象得要簡單。對於這些功能，mfc只不過簡單的封裝了一下，沒有做什麼特別的處理，

    下面，我們就要看看這些功能分別是怎麼實現的。這些程式碼都是從msdn copy過來的，略微做了一些修改。首先，我們看一下檔案對話方塊怎麼寫，

OPENFILENAME ofn;       // common dialog box structure
char szFile[260];       // buffer for file name
HANDLE hf;              // file handle

// Initialize OPENFILENAME
ZeroMemory(&ofn, sizeof(OPENFILENAME));
ofn.lStructSize = sizeof(OPENFILENAME);
ofn.hwndOwner = hWnd;
ofn.lpstrFile = szFile;
szFile[0] = '\0';
ofn.nMaxFile = sizeof(szFile);
ofn.lpstrFilter = "All\0*.*\0Text\0*.TXT\0";
ofn.nFilterIndex = 1;
ofn.lpstrFileTitle = NULL;
ofn.nMaxFileTitle = 0;
ofn.lpstrInitialDir = NULL;
ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;

// Display the Open dialog box. 

if (GetOpenFileName(&ofn)==TRUE) 
    ; 
 

   其次就是字型對話方塊，程式碼如下，

CHOOSEFONT cf;            // common dialog box structure
static LOGFONT lf;        // logical font structure
static DWORD rgbCurrent;   // current text color
HFONT hfont, hfontPrev;
DWORD rgbPrev;

// Initialize CHOOSEFONT
ZeroMemory(&cf, sizeof(CHOOSEFONT));
cf.lStructSize = sizeof (CHOOSEFONT);
cf.hwndOwner = hWnd;
cf.lpLogFont = &lf;
cf.rgbColors = rgbCurrent;
cf.Flags = CF_SCREENFONTS | CF_EFFECTS;

if (ChooseFont(&cf)==TRUE) {
}
 

CHOOSECOLOR cc;                 // common dialog box structure 
static COLORREF acrCustClr[16]; // array of custom colors 
HBRUSH hbrush;                  // brush handle
static DWORD rgbCurrent;        // initial color selection

// Initialize CHOOSECOLOR 
ZeroMemory(&cc, sizeof(CHOOSECOLOR));
cc.lStructSize = sizeof(CHOOSECOLOR);
cc.hwndOwner = hWnd;
cc.lpCustColors = (LPDWORD) acrCustClr;
cc.rgbResult = rgbCurrent;
cc.Flags = CC_FULLOPEN | CC_RGBINIT;
 
if (ChooseColor(&cc)==TRUE) {
     
}