CString::Format

//?看代碼，針對format帶參數列表的情況沒整明白，于是開始百度，搜索百度一大圈沒找到好的解答，最后還是微軟靠譜，與大家分享。

voidFormat(LPCTSTRlpszFormat**, ...);**

void Format( UINT?nFormatID**, ... );**

Parameters

lpszFormat

A format-control string.

nFormatID

The string resource identifier that contains the format-control string.

Remarks

Call this member function to write formatted data to a?CString?in the same way that?sprintf?formats data into a C-style character array. This function formats and stores a series of characters and values in the?CString. Each optional argument (if any) is converted and output according to the corresponding format specification in?lpszFormat?or from the string resource identified by?nFormatID.

The call will fail if the string object itself is offered as a parameter to?Format. For example, the following code:

CString str = "Some Data"; str.Format("%s%d", str, 123);?? // Attention: str is also used in the parameter list.

will cause unpredictable results.

When you pass a character string as an optional argument, you?must?cast it explicitly as?LPCTSTR. The format has the same form and function as the format argument for the?printf?function. (For a description of the format and arguments, see?in the?Run-Time Library Reference.) A null character is appended to the end of the characters written.

For more information, see?in the?Run-Time Library Reference.

Example

CString str;str.Format(_T("Floating point: %.2f\n"), 12345.12345); _tprintf("%s", (LPCTSTR) str);str.Format(_T("Left-justified integer: %.6d\n"), 35); _tprintf("%s", (LPCTSTR) str);str.Format(IDS_SCORE, 5, 3); _tprintf("%s", (LPCTSTR) str);

Output

If the application has a string resource with the identifier IDS_SCORE that contains the string "Penguins: %d\nFlyers? : %d\n", the above code fragment produces this output:

Floating point: 12345.12 Left-justified integer: 000035 Penguins: 5 Flyers? : 3

CString Overview?|??Class Members?|??Hierarchy Chart

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