更新时间:2023-11-09 14:40:34
循环看起来没问题,但看不到其他代码。
一个错误是文件名需要LPCSTR这是一个C风格的字符串,所以转换你需要的C ++字符串
the loop looks OK, but can't see other code.
one mistake is the filename needs LPCSTR which is a C style string so to convert the C++ string you'd need
str.c_str()
第二个错误是串联+使用字符串而不是C字符串。
所以一个想法是适应方法:
second mistake is concatenation with + works with string but not C strings.
so one idea is to adapt method:
string IntToStr(int n)
{
stringstream result;
result<< "C://webcontent/QR"<<n<<".jpg";
return result.str();
}
然后将字符串转换为
then convert string to
LPCSTR
您的问题是关于构建LPCSTR。
尝试以下
Your question is really about constructing a LPCSTR.
Try the following
#include<string>
using namespace std;
for(int n = 0; n < 20; n++)
{
string filename = "C://webcontent/QR"+ to_string((_ULonglong)n) +".jpg";
eCode = BCSaveImageA(pBC, filename.c_str(), 4, LBarcodeWidth,LBarcodeHieght, dpi, dpi);
}
如果您的编译器符合C ++ 11标准,则不需要_ULonglong强制转换。
If your compiler is C++11 compliant you wont need the _ULonglong cast.