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[精华] VC中BSTR、Char和CString类型的转换 - C/C++ - 清泛网 - 专注C/C++及内核技术
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//判断字符串是否是某种类型
CString sValue("123.1");
COleVariant vValue(sValue);
BOOL bStrIsFloat = (SUCCEEDED(VariantChangeType(&vValue, &vValue, 0, VT_R8)) && sValue.Find('.') != -1);
if(bStrIsFloat)
{
AfxMes...
How to input a regex in string.replace?
...lt;[1> in between</[1> and then there are cases ... where the<[99> number ranges from 1-100</[99>.
and there are many other lines in the txt files
with<[3> such tags </[3>"""
result = pattern.sub("", subject)
print(result)
If you want to learn more about regex I...
Are types like uint32, int32, uint64, int64 defined in any stdlib header?
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The C99 stdint.h defines these:
int8_t
int16_t
int32_t
uint8_t
uint16_t
uint32_t
And, if the architecture supports them:
int64_t
uint64_t
There are various other integer typedefs in stdint.h as well.
If you're stuck witho...
What's the difference between :: (double colon) and -> (arrow) in PHP?
...ic function sin($angle) {
return ...;
}
}
$result = Math::sin(123);
Also, the :: operator (the Scope Resolution Operator, a.k.a Paamayim Nekudotayim) is used in dynamic context when you invoke a method/property of a parent class:
class Rectangle {
protected $x, $y;
public ...
When to use symbols instead of strings in Ruby?
..., mode: "ascii")
# removed for brevity
end
write(data: 123, file: "test.txt")
freeze to keep as a string and save memory
label = 'My Label'.freeze
share
|
improve this answe...
How should I print types like off_t and size_t?
...than z and discourages use of it. Nevertheless, it's standardized (by the C99 standard). For those intmax_t and int8_t of stdint.h and so on, there are macros you can use, like another answer said:
printf("value: %" PRId32, some_int32_t);
printf("value: %" PRIu16, some_uint16_t);
They are listed ...
Comma in C/C++ macro
...
This is possible with P99:
#include "p99/p99.h"
#define FOO(...) P99_ALLBUTLAST(__VA_ARGS__) P99_LAST(__VA_ARGS__)
FOO()
The code above effectively strips only the last comma in the argument list. Check with clang -E (P99 requires a C99 compiler...
Why does auto a=1; compile in C?
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No, this isn't legal C since 1999. No decent modern C compiler allows for this.
– Jens Gustedt
May 1 '14 at 11:40
18
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Javascript sort array by two fields
...ems is an array like:
var items = [
{ name: "z - test item", price: "99.99", priority: 0, reviews: 309, rating: 2 },
{ name: "z - test item", price: "1.99", priority: 0, reviews: 11, rating: 0.5 },
{ name: "y - test item", price: "99.99", priority: 1, reviews: 99, rating: 1 },
{ na...
How to print a number with commas as thousands separators in JavaScript
...ith commas as thousands separators. For example, I want to show the number 1234567 as "1,234,567". How would I go about doing this?
...